1987 lines
54 KiB
C
1987 lines
54 KiB
C
/*
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* Copyright (c) 1988, 1989, 1990, 1993
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* The Regents of the University of California. All rights reserved.
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* Copyright (c) 1989 by Berkeley Softworks
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Adam de Boor.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)var.c 8.3 (Berkeley) 3/19/94";
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#endif /* not lint */
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/*-
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* var.c --
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* Variable-handling functions
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*
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* Interface:
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* Var_Set Set the value of a variable in the given
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* context. The variable is created if it doesn't
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* yet exist. The value and variable name need not
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* be preserved.
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*
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* Var_Append Append more characters to an existing variable
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* in the given context. The variable needn't
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* exist already -- it will be created if it doesn't.
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* A space is placed between the old value and the
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* new one.
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*
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* Var_Exists See if a variable exists.
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*
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* Var_Value Return the value of a variable in a context or
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* NULL if the variable is undefined.
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*
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* Var_Subst Substitute named variable, or all variables if
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* NULL in a string using
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* the given context as the top-most one. If the
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* third argument is non-zero, Parse_Error is
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* called if any variables are undefined.
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*
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* Var_Parse Parse a variable expansion from a string and
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* return the result and the number of characters
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* consumed.
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*
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* Var_Delete Delete a variable in a context.
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*
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* Var_Init Initialize this module.
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*
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* Debugging:
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* Var_Dump Print out all variables defined in the given
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* context.
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*
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* XXX: There's a lot of duplication in these functions.
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*/
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#include <ctype.h>
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#include "make.h"
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#include "buf.h"
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/*
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* This is a harmless return value for Var_Parse that can be used by Var_Subst
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* to determine if there was an error in parsing -- easier than returning
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* a flag, as things outside this module don't give a hoot.
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*/
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char var_Error[] = "";
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/*
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* Similar to var_Error, but returned when the 'err' flag for Var_Parse is
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* set false. Why not just use a constant? Well, gcc likes to condense
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* identical string instances...
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*/
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static char varNoError[] = "";
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/*
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* Internally, variables are contained in four different contexts.
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* 1) the environment. They may not be changed. If an environment
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* variable is appended-to, the result is placed in the global
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* context.
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* 2) the global context. Variables set in the Makefile are located in
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* the global context. It is the penultimate context searched when
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* substituting.
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* 3) the command-line context. All variables set on the command line
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* are placed in this context. They are UNALTERABLE once placed here.
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* 4) the local context. Each target has associated with it a context
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* list. On this list are located the structures describing such
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* local variables as $(@) and $(*)
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* The four contexts are searched in the reverse order from which they are
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* listed.
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*/
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GNode *VAR_GLOBAL; /* variables from the makefile */
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GNode *VAR_CMD; /* variables defined on the command-line */
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#define FIND_CMD 0x1 /* look in VAR_CMD when searching */
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#define FIND_GLOBAL 0x2 /* look in VAR_GLOBAL as well */
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#define FIND_ENV 0x4 /* look in the environment also */
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typedef struct Var {
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char *name; /* the variable's name */
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Buffer val; /* its value */
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int flags; /* miscellaneous status flags */
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#define VAR_IN_USE 1 /* Variable's value currently being used.
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* Used to avoid recursion */
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#define VAR_FROM_ENV 2 /* Variable comes from the environment */
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#define VAR_JUNK 4 /* Variable is a junk variable that
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* should be destroyed when done with
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* it. Used by Var_Parse for undefined,
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* modified variables */
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} Var;
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typedef struct {
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char *lhs; /* String to match */
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int leftLen; /* Length of string */
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char *rhs; /* Replacement string (w/ &'s removed) */
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int rightLen; /* Length of replacement */
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int flags;
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#define VAR_SUB_GLOBAL 1 /* Apply substitution globally */
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#define VAR_MATCH_START 2 /* Match at start of word */
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#define VAR_MATCH_END 4 /* Match at end of word */
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#define VAR_NO_SUB 8 /* Substitution is non-global and already done */
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} VarPattern;
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static int VarCmp __P((Var *, char *));
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static Var *VarFind __P((char *, GNode *, int));
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static void VarAdd __P((char *, char *, GNode *));
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static Boolean VarHead __P((char *, Boolean, Buffer));
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static Boolean VarTail __P((char *, Boolean, Buffer));
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static Boolean VarSuffix __P((char *, Boolean, Buffer));
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static Boolean VarRoot __P((char *, Boolean, Buffer));
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static Boolean VarMatch __P((char *, Boolean, Buffer, char *));
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static Boolean VarSYSVMatch __P((char *, Boolean, Buffer, VarPattern *));
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static Boolean VarNoMatch __P((char *, Boolean, Buffer, char *));
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static Boolean VarSubstitute __P((char *, Boolean, Buffer, VarPattern *));
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static char *VarModify __P((char *, Boolean (*modProc )(), ClientData));
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static int VarPrintVar __P((Var *));
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/*-
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*-----------------------------------------------------------------------
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* VarCmp --
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* See if the given variable matches the named one. Called from
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* Lst_Find when searching for a variable of a given name.
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*
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* Results:
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* 0 if they match. non-zero otherwise.
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*
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* Side Effects:
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* none
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*-----------------------------------------------------------------------
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*/
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static int
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VarCmp (v, name)
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Var *v; /* VAR structure to compare */
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char *name; /* name to look for */
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{
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return (strcmp (name, v->name));
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}
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/*-
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*-----------------------------------------------------------------------
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* VarFind --
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* Find the given variable in the given context and any other contexts
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* indicated.
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*
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* Results:
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* A pointer to the structure describing the desired variable or
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* NIL if the variable does not exist.
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*
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* Side Effects:
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* None
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*-----------------------------------------------------------------------
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*/
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static Var *
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VarFind (name, ctxt, flags)
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char *name; /* name to find */
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GNode *ctxt; /* context in which to find it */
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int flags; /* FIND_GLOBAL set means to look in the
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* VAR_GLOBAL context as well.
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* FIND_CMD set means to look in the VAR_CMD
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* context also.
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* FIND_ENV set means to look in the
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* environment */
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{
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LstNode var;
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Var *v;
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/*
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* If the variable name begins with a '.', it could very well be one of
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* the local ones. We check the name against all the local variables
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* and substitute the short version in for 'name' if it matches one of
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* them.
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*/
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if (*name == '.' && isupper(name[1]))
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switch (name[1]) {
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case 'A':
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if (!strcmp(name, ".ALLSRC"))
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name = ALLSRC;
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if (!strcmp(name, ".ARCHIVE"))
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name = ARCHIVE;
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break;
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case 'I':
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if (!strcmp(name, ".IMPSRC"))
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name = IMPSRC;
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break;
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case 'M':
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if (!strcmp(name, ".MEMBER"))
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name = MEMBER;
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break;
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case 'O':
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if (!strcmp(name, ".OODATE"))
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name = OODATE;
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break;
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case 'P':
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if (!strcmp(name, ".PREFIX"))
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name = PREFIX;
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break;
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case 'T':
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if (!strcmp(name, ".TARGET"))
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name = TARGET;
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break;
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}
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/*
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* First look for the variable in the given context. If it's not there,
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* look for it in VAR_CMD, VAR_GLOBAL and the environment, in that order,
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* depending on the FIND_* flags in 'flags'
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*/
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var = Lst_Find (ctxt->context, (ClientData)name, VarCmp);
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if ((var == NILLNODE) && (flags & FIND_CMD) && (ctxt != VAR_CMD)) {
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var = Lst_Find (VAR_CMD->context, (ClientData)name, VarCmp);
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}
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if (!checkEnvFirst && (var == NILLNODE) && (flags & FIND_GLOBAL) &&
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(ctxt != VAR_GLOBAL))
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{
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var = Lst_Find (VAR_GLOBAL->context, (ClientData)name, VarCmp);
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}
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if ((var == NILLNODE) && (flags & FIND_ENV)) {
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char *env;
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if ((env = getenv (name)) != NULL) {
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/*
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* If the variable is found in the environment, we only duplicate
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* its value (since eVarVal was allocated on the stack). The name
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* doesn't need duplication since it's always in the environment
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*/
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int len;
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v = (Var *) emalloc(sizeof(Var));
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v->name = name;
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len = strlen(env);
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v->val = Buf_Init(len);
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Buf_AddBytes(v->val, len, (Byte *)env);
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v->flags = VAR_FROM_ENV;
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return (v);
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} else if (checkEnvFirst && (flags & FIND_GLOBAL) &&
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(ctxt != VAR_GLOBAL))
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{
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var = Lst_Find (VAR_GLOBAL->context, (ClientData)name, VarCmp);
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if (var == NILLNODE) {
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return ((Var *) NIL);
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} else {
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return ((Var *)Lst_Datum(var));
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}
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} else {
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return((Var *)NIL);
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}
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} else if (var == NILLNODE) {
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return ((Var *) NIL);
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} else {
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return ((Var *) Lst_Datum (var));
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}
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}
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/*-
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*-----------------------------------------------------------------------
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* VarAdd --
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* Add a new variable of name name and value val to the given context
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*
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* Results:
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* None
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*
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* Side Effects:
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* The new variable is placed at the front of the given context
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* The name and val arguments are duplicated so they may
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* safely be freed.
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*-----------------------------------------------------------------------
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*/
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static void
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VarAdd (name, val, ctxt)
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char *name; /* name of variable to add */
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char *val; /* value to set it to */
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GNode *ctxt; /* context in which to set it */
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{
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register Var *v;
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int len;
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v = (Var *) emalloc (sizeof (Var));
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v->name = strdup (name);
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len = val ? strlen(val) : 0;
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v->val = Buf_Init(len+1);
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Buf_AddBytes(v->val, len, (Byte *)val);
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v->flags = 0;
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(void) Lst_AtFront (ctxt->context, (ClientData)v);
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if (DEBUG(VAR)) {
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printf("%s:%s = %s\n", ctxt->name, name, val);
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}
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}
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/*-
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*-----------------------------------------------------------------------
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* Var_Delete --
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* Remove a variable from a context.
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*
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* Results:
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* None.
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*
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* Side Effects:
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* The Var structure is removed and freed.
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*
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*-----------------------------------------------------------------------
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*/
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void
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Var_Delete(name, ctxt)
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char *name;
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GNode *ctxt;
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{
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LstNode ln;
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if (DEBUG(VAR)) {
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printf("%s:delete %s\n", ctxt->name, name);
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}
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ln = Lst_Find(ctxt->context, (ClientData)name, VarCmp);
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if (ln != NILLNODE) {
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register Var *v;
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v = (Var *)Lst_Datum(ln);
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Lst_Remove(ctxt->context, ln);
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Buf_Destroy(v->val, TRUE);
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free(v->name);
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free((char *)v);
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}
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}
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/*-
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*-----------------------------------------------------------------------
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* Var_Set --
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* Set the variable name to the value val in the given context.
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*
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* Results:
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* None.
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*
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* Side Effects:
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* If the variable doesn't yet exist, a new record is created for it.
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* Else the old value is freed and the new one stuck in its place
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*
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* Notes:
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* The variable is searched for only in its context before being
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* created in that context. I.e. if the context is VAR_GLOBAL,
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* only VAR_GLOBAL->context is searched. Likewise if it is VAR_CMD, only
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* VAR_CMD->context is searched. This is done to avoid the literally
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* thousands of unnecessary strcmp's that used to be done to
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* set, say, $(@) or $(<).
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*-----------------------------------------------------------------------
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*/
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void
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Var_Set (name, val, ctxt)
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char *name; /* name of variable to set */
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char *val; /* value to give to the variable */
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GNode *ctxt; /* context in which to set it */
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{
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register Var *v;
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/*
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* We only look for a variable in the given context since anything set
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* here will override anything in a lower context, so there's not much
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* point in searching them all just to save a bit of memory...
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*/
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v = VarFind (name, ctxt, 0);
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if (v == (Var *) NIL) {
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VarAdd (name, val, ctxt);
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} else {
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Buf_Discard(v->val, Buf_Size(v->val));
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Buf_AddBytes(v->val, strlen(val), (Byte *)val);
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if (DEBUG(VAR)) {
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printf("%s:%s = %s\n", ctxt->name, name, val);
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}
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}
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/*
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* Any variables given on the command line are automatically exported
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* to the environment (as per POSIX standard)
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*/
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if (ctxt == VAR_CMD) {
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setenv(name, val, 1);
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}
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}
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/*-
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*-----------------------------------------------------------------------
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* Var_Append --
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* The variable of the given name has the given value appended to it in
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* the given context.
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*
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* Results:
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* None
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*
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* Side Effects:
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* If the variable doesn't exist, it is created. Else the strings
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* are concatenated (with a space in between).
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*
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* Notes:
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* Only if the variable is being sought in the global context is the
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* environment searched.
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* XXX: Knows its calling circumstances in that if called with ctxt
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* an actual target, it will only search that context since only
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* a local variable could be being appended to. This is actually
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* a big win and must be tolerated.
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*-----------------------------------------------------------------------
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*/
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void
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Var_Append (name, val, ctxt)
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char *name; /* Name of variable to modify */
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char *val; /* String to append to it */
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GNode *ctxt; /* Context in which this should occur */
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{
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register Var *v;
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v = VarFind (name, ctxt, (ctxt == VAR_GLOBAL) ? FIND_ENV : 0);
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if (v == (Var *) NIL) {
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VarAdd (name, val, ctxt);
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} else {
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Buf_AddByte(v->val, (Byte)' ');
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Buf_AddBytes(v->val, strlen(val), (Byte *)val);
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if (DEBUG(VAR)) {
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printf("%s:%s = %s\n", ctxt->name, name,
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(char *) Buf_GetAll(v->val, (int *)NULL));
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}
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if (v->flags & VAR_FROM_ENV) {
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/*
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* If the original variable came from the environment, we
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* have to install it in the global context (we could place
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* it in the environment, but then we should provide a way to
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* export other variables...)
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*/
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v->flags &= ~VAR_FROM_ENV;
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Lst_AtFront(ctxt->context, (ClientData)v);
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}
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}
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}
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/*-
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*-----------------------------------------------------------------------
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* Var_Exists --
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* See if the given variable exists.
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*
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* Results:
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* TRUE if it does, FALSE if it doesn't
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*
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* Side Effects:
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* None.
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*
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*-----------------------------------------------------------------------
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*/
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Boolean
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Var_Exists(name, ctxt)
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char *name; /* Variable to find */
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GNode *ctxt; /* Context in which to start search */
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{
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Var *v;
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v = VarFind(name, ctxt, FIND_CMD|FIND_GLOBAL|FIND_ENV);
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if (v == (Var *)NIL) {
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return(FALSE);
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} else if (v->flags & VAR_FROM_ENV) {
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Buf_Destroy(v->val, TRUE);
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free((char *)v);
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}
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return(TRUE);
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}
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/*-
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*-----------------------------------------------------------------------
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* Var_Value --
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* Return the value of the named variable in the given context
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*
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* Results:
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* The value if the variable exists, NULL if it doesn't
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*
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* Side Effects:
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* None
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*-----------------------------------------------------------------------
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*/
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char *
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Var_Value (name, ctxt)
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char *name; /* name to find */
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GNode *ctxt; /* context in which to search for it */
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{
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|
Var *v;
|
|
|
|
v = VarFind (name, ctxt, FIND_ENV | FIND_GLOBAL | FIND_CMD);
|
|
if (v != (Var *) NIL) {
|
|
return ((char *)Buf_GetAll(v->val, (int *)NULL));
|
|
} else {
|
|
return ((char *) NULL);
|
|
}
|
|
}
|
|
|
|
/*-
|
|
*-----------------------------------------------------------------------
|
|
* VarHead --
|
|
* Remove the tail of the given word and place the result in the given
|
|
* buffer.
|
|
*
|
|
* Results:
|
|
* TRUE if characters were added to the buffer (a space needs to be
|
|
* added to the buffer before the next word).
|
|
*
|
|
* Side Effects:
|
|
* The trimmed word is added to the buffer.
|
|
*
|
|
*-----------------------------------------------------------------------
|
|
*/
|
|
static Boolean
|
|
VarHead (word, addSpace, buf)
|
|
char *word; /* Word to trim */
|
|
Boolean addSpace; /* True if need to add a space to the buffer
|
|
* before sticking in the head */
|
|
Buffer buf; /* Buffer in which to store it */
|
|
{
|
|
register char *slash;
|
|
|
|
slash = strrchr (word, '/');
|
|
if (slash != (char *)NULL) {
|
|
if (addSpace) {
|
|
Buf_AddByte (buf, (Byte)' ');
|
|
}
|
|
*slash = '\0';
|
|
Buf_AddBytes (buf, strlen (word), (Byte *)word);
|
|
*slash = '/';
|
|
return (TRUE);
|
|
} else {
|
|
/*
|
|
* If no directory part, give . (q.v. the POSIX standard)
|
|
*/
|
|
if (addSpace) {
|
|
Buf_AddBytes(buf, 2, (Byte *)" .");
|
|
} else {
|
|
Buf_AddByte(buf, (Byte)'.');
|
|
}
|
|
return(TRUE);
|
|
}
|
|
}
|
|
|
|
/*-
|
|
*-----------------------------------------------------------------------
|
|
* VarTail --
|
|
* Remove the head of the given word and place the result in the given
|
|
* buffer.
|
|
*
|
|
* Results:
|
|
* TRUE if characters were added to the buffer (a space needs to be
|
|
* added to the buffer before the next word).
|
|
*
|
|
* Side Effects:
|
|
* The trimmed word is added to the buffer.
|
|
*
|
|
*-----------------------------------------------------------------------
|
|
*/
|
|
static Boolean
|
|
VarTail (word, addSpace, buf)
|
|
char *word; /* Word to trim */
|
|
Boolean addSpace; /* TRUE if need to stick a space in the
|
|
* buffer before adding the tail */
|
|
Buffer buf; /* Buffer in which to store it */
|
|
{
|
|
register char *slash;
|
|
|
|
if (addSpace) {
|
|
Buf_AddByte (buf, (Byte)' ');
|
|
}
|
|
|
|
slash = strrchr (word, '/');
|
|
if (slash != (char *)NULL) {
|
|
*slash++ = '\0';
|
|
Buf_AddBytes (buf, strlen(slash), (Byte *)slash);
|
|
slash[-1] = '/';
|
|
} else {
|
|
Buf_AddBytes (buf, strlen(word), (Byte *)word);
|
|
}
|
|
return (TRUE);
|
|
}
|
|
|
|
/*-
|
|
*-----------------------------------------------------------------------
|
|
* VarSuffix --
|
|
* Place the suffix of the given word in the given buffer.
|
|
*
|
|
* Results:
|
|
* TRUE if characters were added to the buffer (a space needs to be
|
|
* added to the buffer before the next word).
|
|
*
|
|
* Side Effects:
|
|
* The suffix from the word is placed in the buffer.
|
|
*
|
|
*-----------------------------------------------------------------------
|
|
*/
|
|
static Boolean
|
|
VarSuffix (word, addSpace, buf)
|
|
char *word; /* Word to trim */
|
|
Boolean addSpace; /* TRUE if need to add a space before placing
|
|
* the suffix in the buffer */
|
|
Buffer buf; /* Buffer in which to store it */
|
|
{
|
|
register char *dot;
|
|
|
|
dot = strrchr (word, '.');
|
|
if (dot != (char *)NULL) {
|
|
if (addSpace) {
|
|
Buf_AddByte (buf, (Byte)' ');
|
|
}
|
|
*dot++ = '\0';
|
|
Buf_AddBytes (buf, strlen (dot), (Byte *)dot);
|
|
dot[-1] = '.';
|
|
return (TRUE);
|
|
} else {
|
|
return (addSpace);
|
|
}
|
|
}
|
|
|
|
/*-
|
|
*-----------------------------------------------------------------------
|
|
* VarRoot --
|
|
* Remove the suffix of the given word and place the result in the
|
|
* buffer.
|
|
*
|
|
* Results:
|
|
* TRUE if characters were added to the buffer (a space needs to be
|
|
* added to the buffer before the next word).
|
|
*
|
|
* Side Effects:
|
|
* The trimmed word is added to the buffer.
|
|
*
|
|
*-----------------------------------------------------------------------
|
|
*/
|
|
static Boolean
|
|
VarRoot (word, addSpace, buf)
|
|
char *word; /* Word to trim */
|
|
Boolean addSpace; /* TRUE if need to add a space to the buffer
|
|
* before placing the root in it */
|
|
Buffer buf; /* Buffer in which to store it */
|
|
{
|
|
register char *dot;
|
|
|
|
if (addSpace) {
|
|
Buf_AddByte (buf, (Byte)' ');
|
|
}
|
|
|
|
dot = strrchr (word, '.');
|
|
if (dot != (char *)NULL) {
|
|
*dot = '\0';
|
|
Buf_AddBytes (buf, strlen (word), (Byte *)word);
|
|
*dot = '.';
|
|
} else {
|
|
Buf_AddBytes (buf, strlen(word), (Byte *)word);
|
|
}
|
|
return (TRUE);
|
|
}
|
|
|
|
/*-
|
|
*-----------------------------------------------------------------------
|
|
* VarMatch --
|
|
* Place the word in the buffer if it matches the given pattern.
|
|
* Callback function for VarModify to implement the :M modifier.
|
|
*
|
|
* Results:
|
|
* TRUE if a space should be placed in the buffer before the next
|
|
* word.
|
|
*
|
|
* Side Effects:
|
|
* The word may be copied to the buffer.
|
|
*
|
|
*-----------------------------------------------------------------------
|
|
*/
|
|
static Boolean
|
|
VarMatch (word, addSpace, buf, pattern)
|
|
char *word; /* Word to examine */
|
|
Boolean addSpace; /* TRUE if need to add a space to the
|
|
* buffer before adding the word, if it
|
|
* matches */
|
|
Buffer buf; /* Buffer in which to store it */
|
|
char *pattern; /* Pattern the word must match */
|
|
{
|
|
if (Str_Match(word, pattern)) {
|
|
if (addSpace) {
|
|
Buf_AddByte(buf, (Byte)' ');
|
|
}
|
|
addSpace = TRUE;
|
|
Buf_AddBytes(buf, strlen(word), (Byte *)word);
|
|
}
|
|
return(addSpace);
|
|
}
|
|
|
|
|
|
|
|
/*-
|
|
*-----------------------------------------------------------------------
|
|
* VarSYSVMatch --
|
|
* Place the word in the buffer if it matches the given pattern.
|
|
* Callback function for VarModify to implement the System V %
|
|
* modifiers.
|
|
*
|
|
* Results:
|
|
* TRUE if a space should be placed in the buffer before the next
|
|
* word.
|
|
*
|
|
* Side Effects:
|
|
* The word may be copied to the buffer.
|
|
*
|
|
*-----------------------------------------------------------------------
|
|
*/
|
|
static Boolean
|
|
VarSYSVMatch (word, addSpace, buf, pat)
|
|
char *word; /* Word to examine */
|
|
Boolean addSpace; /* TRUE if need to add a space to the
|
|
* buffer before adding the word, if it
|
|
* matches */
|
|
Buffer buf; /* Buffer in which to store it */
|
|
VarPattern *pat; /* Pattern the word must match */
|
|
{
|
|
int len;
|
|
char *ptr;
|
|
|
|
if (addSpace)
|
|
Buf_AddByte(buf, (Byte)' ');
|
|
|
|
addSpace = TRUE;
|
|
|
|
if ((ptr = Str_SYSVMatch(word, pat->lhs, &len)) != NULL)
|
|
Str_SYSVSubst(buf, pat->rhs, ptr, len);
|
|
else
|
|
Buf_AddBytes(buf, strlen(word), (Byte *) word);
|
|
|
|
return(addSpace);
|
|
}
|
|
|
|
|
|
/*-
|
|
*-----------------------------------------------------------------------
|
|
* VarNoMatch --
|
|
* Place the word in the buffer if it doesn't match the given pattern.
|
|
* Callback function for VarModify to implement the :N modifier.
|
|
*
|
|
* Results:
|
|
* TRUE if a space should be placed in the buffer before the next
|
|
* word.
|
|
*
|
|
* Side Effects:
|
|
* The word may be copied to the buffer.
|
|
*
|
|
*-----------------------------------------------------------------------
|
|
*/
|
|
static Boolean
|
|
VarNoMatch (word, addSpace, buf, pattern)
|
|
char *word; /* Word to examine */
|
|
Boolean addSpace; /* TRUE if need to add a space to the
|
|
* buffer before adding the word, if it
|
|
* matches */
|
|
Buffer buf; /* Buffer in which to store it */
|
|
char *pattern; /* Pattern the word must match */
|
|
{
|
|
if (!Str_Match(word, pattern)) {
|
|
if (addSpace) {
|
|
Buf_AddByte(buf, (Byte)' ');
|
|
}
|
|
addSpace = TRUE;
|
|
Buf_AddBytes(buf, strlen(word), (Byte *)word);
|
|
}
|
|
return(addSpace);
|
|
}
|
|
|
|
|
|
/*-
|
|
*-----------------------------------------------------------------------
|
|
* VarSubstitute --
|
|
* Perform a string-substitution on the given word, placing the
|
|
* result in the passed buffer.
|
|
*
|
|
* Results:
|
|
* TRUE if a space is needed before more characters are added.
|
|
*
|
|
* Side Effects:
|
|
* None.
|
|
*
|
|
*-----------------------------------------------------------------------
|
|
*/
|
|
static Boolean
|
|
VarSubstitute (word, addSpace, buf, pattern)
|
|
char *word; /* Word to modify */
|
|
Boolean addSpace; /* True if space should be added before
|
|
* other characters */
|
|
Buffer buf; /* Buffer for result */
|
|
register VarPattern *pattern; /* Pattern for substitution */
|
|
{
|
|
register int wordLen; /* Length of word */
|
|
register char *cp; /* General pointer */
|
|
|
|
wordLen = strlen(word);
|
|
if ((pattern->flags & VAR_NO_SUB) == 0) {
|
|
/*
|
|
* Still substituting -- break it down into simple anchored cases
|
|
* and if none of them fits, perform the general substitution case.
|
|
*/
|
|
if ((pattern->flags & VAR_MATCH_START) &&
|
|
(strncmp(word, pattern->lhs, pattern->leftLen) == 0)) {
|
|
/*
|
|
* Anchored at start and beginning of word matches pattern
|
|
*/
|
|
if ((pattern->flags & VAR_MATCH_END) &&
|
|
(wordLen == pattern->leftLen)) {
|
|
/*
|
|
* Also anchored at end and matches to the end (word
|
|
* is same length as pattern) add space and rhs only
|
|
* if rhs is non-null.
|
|
*/
|
|
if (pattern->rightLen != 0) {
|
|
if (addSpace) {
|
|
Buf_AddByte(buf, (Byte)' ');
|
|
}
|
|
addSpace = TRUE;
|
|
Buf_AddBytes(buf, pattern->rightLen,
|
|
(Byte *)pattern->rhs);
|
|
}
|
|
} else if (pattern->flags & VAR_MATCH_END) {
|
|
/*
|
|
* Doesn't match to end -- copy word wholesale
|
|
*/
|
|
goto nosub;
|
|
} else {
|
|
/*
|
|
* Matches at start but need to copy in trailing characters
|
|
*/
|
|
if ((pattern->rightLen + wordLen - pattern->leftLen) != 0){
|
|
if (addSpace) {
|
|
Buf_AddByte(buf, (Byte)' ');
|
|
}
|
|
addSpace = TRUE;
|
|
}
|
|
Buf_AddBytes(buf, pattern->rightLen, (Byte *)pattern->rhs);
|
|
Buf_AddBytes(buf, wordLen - pattern->leftLen,
|
|
(Byte *)(word + pattern->leftLen));
|
|
}
|
|
} else if (pattern->flags & VAR_MATCH_START) {
|
|
/*
|
|
* Had to match at start of word and didn't -- copy whole word.
|
|
*/
|
|
goto nosub;
|
|
} else if (pattern->flags & VAR_MATCH_END) {
|
|
/*
|
|
* Anchored at end, Find only place match could occur (leftLen
|
|
* characters from the end of the word) and see if it does. Note
|
|
* that because the $ will be left at the end of the lhs, we have
|
|
* to use strncmp.
|
|
*/
|
|
cp = word + (wordLen - pattern->leftLen);
|
|
if ((cp >= word) &&
|
|
(strncmp(cp, pattern->lhs, pattern->leftLen) == 0)) {
|
|
/*
|
|
* Match found. If we will place characters in the buffer,
|
|
* add a space before hand as indicated by addSpace, then
|
|
* stuff in the initial, unmatched part of the word followed
|
|
* by the right-hand-side.
|
|
*/
|
|
if (((cp - word) + pattern->rightLen) != 0) {
|
|
if (addSpace) {
|
|
Buf_AddByte(buf, (Byte)' ');
|
|
}
|
|
addSpace = TRUE;
|
|
}
|
|
Buf_AddBytes(buf, cp - word, (Byte *)word);
|
|
Buf_AddBytes(buf, pattern->rightLen, (Byte *)pattern->rhs);
|
|
} else {
|
|
/*
|
|
* Had to match at end and didn't. Copy entire word.
|
|
*/
|
|
goto nosub;
|
|
}
|
|
} else {
|
|
/*
|
|
* Pattern is unanchored: search for the pattern in the word using
|
|
* String_FindSubstring, copying unmatched portions and the
|
|
* right-hand-side for each match found, handling non-global
|
|
* subsititutions correctly, etc. When the loop is done, any
|
|
* remaining part of the word (word and wordLen are adjusted
|
|
* accordingly through the loop) is copied straight into the
|
|
* buffer.
|
|
* addSpace is set FALSE as soon as a space is added to the
|
|
* buffer.
|
|
*/
|
|
register Boolean done;
|
|
int origSize;
|
|
|
|
done = FALSE;
|
|
origSize = Buf_Size(buf);
|
|
while (!done) {
|
|
cp = Str_FindSubstring(word, pattern->lhs);
|
|
if (cp != (char *)NULL) {
|
|
if (addSpace && (((cp - word) + pattern->rightLen) != 0)){
|
|
Buf_AddByte(buf, (Byte)' ');
|
|
addSpace = FALSE;
|
|
}
|
|
Buf_AddBytes(buf, cp-word, (Byte *)word);
|
|
Buf_AddBytes(buf, pattern->rightLen, (Byte *)pattern->rhs);
|
|
wordLen -= (cp - word) + pattern->leftLen;
|
|
word = cp + pattern->leftLen;
|
|
if (wordLen == 0) {
|
|
done = TRUE;
|
|
}
|
|
if ((pattern->flags & VAR_SUB_GLOBAL) == 0) {
|
|
done = TRUE;
|
|
pattern->flags |= VAR_NO_SUB;
|
|
}
|
|
} else {
|
|
done = TRUE;
|
|
}
|
|
}
|
|
if (wordLen != 0) {
|
|
if (addSpace) {
|
|
Buf_AddByte(buf, (Byte)' ');
|
|
}
|
|
Buf_AddBytes(buf, wordLen, (Byte *)word);
|
|
}
|
|
/*
|
|
* If added characters to the buffer, need to add a space
|
|
* before we add any more. If we didn't add any, just return
|
|
* the previous value of addSpace.
|
|
*/
|
|
return ((Buf_Size(buf) != origSize) || addSpace);
|
|
}
|
|
/*
|
|
* Common code for anchored substitutions: if performed a substitution
|
|
* and it's not supposed to be global, mark the pattern as requiring
|
|
* no more substitutions. addSpace was set TRUE if characters were
|
|
* added to the buffer.
|
|
*/
|
|
if ((pattern->flags & VAR_SUB_GLOBAL) == 0) {
|
|
pattern->flags |= VAR_NO_SUB;
|
|
}
|
|
return (addSpace);
|
|
}
|
|
nosub:
|
|
if (addSpace) {
|
|
Buf_AddByte(buf, (Byte)' ');
|
|
}
|
|
Buf_AddBytes(buf, wordLen, (Byte *)word);
|
|
return(TRUE);
|
|
}
|
|
|
|
/*-
|
|
*-----------------------------------------------------------------------
|
|
* VarModify --
|
|
* Modify each of the words of the passed string using the given
|
|
* function. Used to implement all modifiers.
|
|
*
|
|
* Results:
|
|
* A string of all the words modified appropriately.
|
|
*
|
|
* Side Effects:
|
|
* None.
|
|
*
|
|
*-----------------------------------------------------------------------
|
|
*/
|
|
static char *
|
|
VarModify (str, modProc, datum)
|
|
char *str; /* String whose words should be trimmed */
|
|
Boolean (*modProc)(); /* Function to use to modify them */
|
|
ClientData datum; /* Datum to pass it */
|
|
{
|
|
Buffer buf; /* Buffer for the new string */
|
|
register char *cp; /* Pointer to end of current word */
|
|
char endc; /* Character that ended the word */
|
|
Boolean addSpace; /* TRUE if need to add a space to the
|
|
* buffer before adding the trimmed
|
|
* word */
|
|
|
|
buf = Buf_Init (0);
|
|
cp = str;
|
|
addSpace = FALSE;
|
|
|
|
for (;;) {
|
|
/*
|
|
* Skip to next word and place cp at its end.
|
|
*/
|
|
while (isspace (*str)) {
|
|
str++;
|
|
}
|
|
for (cp = str; *cp != '\0' && !isspace (*cp); cp++)
|
|
continue;
|
|
if (cp == str) {
|
|
/*
|
|
* If we didn't go anywhere, we must be done!
|
|
*/
|
|
Buf_AddByte (buf, '\0');
|
|
str = (char *)Buf_GetAll (buf, (int *)NULL);
|
|
Buf_Destroy (buf, FALSE);
|
|
return (str);
|
|
}
|
|
/*
|
|
* Nuke terminating character, but save it in endc b/c if str was
|
|
* some variable's value, it would not be good to screw it
|
|
* over...
|
|
*/
|
|
endc = *cp;
|
|
*cp = '\0';
|
|
|
|
addSpace = (* modProc) (str, addSpace, buf, datum);
|
|
|
|
if (endc) {
|
|
*cp++ = endc;
|
|
}
|
|
str = cp;
|
|
}
|
|
}
|
|
|
|
/*-
|
|
*-----------------------------------------------------------------------
|
|
* Var_Parse --
|
|
* Given the start of a variable invocation, extract the variable
|
|
* name and find its value, then modify it according to the
|
|
* specification.
|
|
*
|
|
* Results:
|
|
* The (possibly-modified) value of the variable or var_Error if the
|
|
* specification is invalid. The length of the specification is
|
|
* placed in *lengthPtr (for invalid specifications, this is just
|
|
* 2...?).
|
|
* A Boolean in *freePtr telling whether the returned string should
|
|
* be freed by the caller.
|
|
*
|
|
* Side Effects:
|
|
* None.
|
|
*
|
|
*-----------------------------------------------------------------------
|
|
*/
|
|
char *
|
|
Var_Parse (str, ctxt, err, lengthPtr, freePtr)
|
|
char *str; /* The string to parse */
|
|
GNode *ctxt; /* The context for the variable */
|
|
Boolean err; /* TRUE if undefined variables are an error */
|
|
int *lengthPtr; /* OUT: The length of the specification */
|
|
Boolean *freePtr; /* OUT: TRUE if caller should free result */
|
|
{
|
|
register char *tstr; /* Pointer into str */
|
|
Var *v; /* Variable in invocation */
|
|
register char *cp; /* Secondary pointer into str (place marker
|
|
* for tstr) */
|
|
Boolean haveModifier;/* TRUE if have modifiers for the variable */
|
|
register char endc; /* Ending character when variable in parens
|
|
* or braces */
|
|
char *start;
|
|
Boolean dynamic; /* TRUE if the variable is local and we're
|
|
* expanding it in a non-local context. This
|
|
* is done to support dynamic sources. The
|
|
* result is just the invocation, unaltered */
|
|
|
|
*freePtr = FALSE;
|
|
dynamic = FALSE;
|
|
start = str;
|
|
|
|
if (str[1] != '(' && str[1] != '{') {
|
|
/*
|
|
* If it's not bounded by braces of some sort, life is much simpler.
|
|
* We just need to check for the first character and return the
|
|
* value if it exists.
|
|
*/
|
|
char name[2];
|
|
|
|
name[0] = str[1];
|
|
name[1] = '\0';
|
|
|
|
v = VarFind (name, ctxt, FIND_ENV | FIND_GLOBAL | FIND_CMD);
|
|
if (v == (Var *)NIL) {
|
|
*lengthPtr = 2;
|
|
|
|
if ((ctxt == VAR_CMD) || (ctxt == VAR_GLOBAL)) {
|
|
/*
|
|
* If substituting a local variable in a non-local context,
|
|
* assume it's for dynamic source stuff. We have to handle
|
|
* this specially and return the longhand for the variable
|
|
* with the dollar sign escaped so it makes it back to the
|
|
* caller. Only four of the local variables are treated
|
|
* specially as they are the only four that will be set
|
|
* when dynamic sources are expanded.
|
|
*/
|
|
switch (str[1]) {
|
|
case '@':
|
|
return("$(.TARGET)");
|
|
case '%':
|
|
return("$(.ARCHIVE)");
|
|
case '*':
|
|
return("$(.PREFIX)");
|
|
case '!':
|
|
return("$(.MEMBER)");
|
|
}
|
|
}
|
|
/*
|
|
* Error
|
|
*/
|
|
return (err ? var_Error : varNoError);
|
|
} else {
|
|
haveModifier = FALSE;
|
|
tstr = &str[1];
|
|
endc = str[1];
|
|
}
|
|
} else {
|
|
endc = str[1] == '(' ? ')' : '}';
|
|
|
|
/*
|
|
* Skip to the end character or a colon, whichever comes first.
|
|
*/
|
|
for (tstr = str + 2;
|
|
*tstr != '\0' && *tstr != endc && *tstr != ':';
|
|
tstr++)
|
|
{
|
|
continue;
|
|
}
|
|
if (*tstr == ':') {
|
|
haveModifier = TRUE;
|
|
} else if (*tstr != '\0') {
|
|
haveModifier = FALSE;
|
|
} else {
|
|
/*
|
|
* If we never did find the end character, return NULL
|
|
* right now, setting the length to be the distance to
|
|
* the end of the string, since that's what make does.
|
|
*/
|
|
*lengthPtr = tstr - str;
|
|
return (var_Error);
|
|
}
|
|
*tstr = '\0';
|
|
|
|
v = VarFind (str + 2, ctxt, FIND_ENV | FIND_GLOBAL | FIND_CMD);
|
|
if ((v == (Var *)NIL) && (ctxt != VAR_CMD) && (ctxt != VAR_GLOBAL) &&
|
|
((tstr-str) == 4) && (str[3] == 'F' || str[3] == 'D'))
|
|
{
|
|
/*
|
|
* Check for bogus D and F forms of local variables since we're
|
|
* in a local context and the name is the right length.
|
|
*/
|
|
switch(str[2]) {
|
|
case '@':
|
|
case '%':
|
|
case '*':
|
|
case '!':
|
|
case '>':
|
|
case '<':
|
|
{
|
|
char vname[2];
|
|
char *val;
|
|
|
|
/*
|
|
* Well, it's local -- go look for it.
|
|
*/
|
|
vname[0] = str[2];
|
|
vname[1] = '\0';
|
|
v = VarFind(vname, ctxt, 0);
|
|
|
|
if (v != (Var *)NIL) {
|
|
/*
|
|
* No need for nested expansion or anything, as we're
|
|
* the only one who sets these things and we sure don't
|
|
* but nested invocations in them...
|
|
*/
|
|
val = (char *)Buf_GetAll(v->val, (int *)NULL);
|
|
|
|
if (str[3] == 'D') {
|
|
val = VarModify(val, VarHead, (ClientData)0);
|
|
} else {
|
|
val = VarModify(val, VarTail, (ClientData)0);
|
|
}
|
|
/*
|
|
* Resulting string is dynamically allocated, so
|
|
* tell caller to free it.
|
|
*/
|
|
*freePtr = TRUE;
|
|
*lengthPtr = tstr-start+1;
|
|
*tstr = endc;
|
|
return(val);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (v == (Var *)NIL) {
|
|
if ((((tstr-str) == 3) ||
|
|
((((tstr-str) == 4) && (str[3] == 'F' ||
|
|
str[3] == 'D')))) &&
|
|
((ctxt == VAR_CMD) || (ctxt == VAR_GLOBAL)))
|
|
{
|
|
/*
|
|
* If substituting a local variable in a non-local context,
|
|
* assume it's for dynamic source stuff. We have to handle
|
|
* this specially and return the longhand for the variable
|
|
* with the dollar sign escaped so it makes it back to the
|
|
* caller. Only four of the local variables are treated
|
|
* specially as they are the only four that will be set
|
|
* when dynamic sources are expanded.
|
|
*/
|
|
switch (str[2]) {
|
|
case '@':
|
|
case '%':
|
|
case '*':
|
|
case '!':
|
|
dynamic = TRUE;
|
|
break;
|
|
}
|
|
} else if (((tstr-str) > 4) && (str[2] == '.') &&
|
|
isupper(str[3]) &&
|
|
((ctxt == VAR_CMD) || (ctxt == VAR_GLOBAL)))
|
|
{
|
|
int len;
|
|
|
|
len = (tstr-str) - 3;
|
|
if ((strncmp(str+2, ".TARGET", len) == 0) ||
|
|
(strncmp(str+2, ".ARCHIVE", len) == 0) ||
|
|
(strncmp(str+2, ".PREFIX", len) == 0) ||
|
|
(strncmp(str+2, ".MEMBER", len) == 0))
|
|
{
|
|
dynamic = TRUE;
|
|
}
|
|
}
|
|
|
|
if (!haveModifier) {
|
|
/*
|
|
* No modifiers -- have specification length so we can return
|
|
* now.
|
|
*/
|
|
*lengthPtr = tstr - start + 1;
|
|
*tstr = endc;
|
|
if (dynamic) {
|
|
str = emalloc(*lengthPtr + 1);
|
|
strncpy(str, start, *lengthPtr);
|
|
str[*lengthPtr] = '\0';
|
|
*freePtr = TRUE;
|
|
return(str);
|
|
} else {
|
|
return (err ? var_Error : varNoError);
|
|
}
|
|
} else {
|
|
/*
|
|
* Still need to get to the end of the variable specification,
|
|
* so kludge up a Var structure for the modifications
|
|
*/
|
|
v = (Var *) emalloc(sizeof(Var));
|
|
v->name = &str[1];
|
|
v->val = Buf_Init(1);
|
|
v->flags = VAR_JUNK;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (v->flags & VAR_IN_USE) {
|
|
Fatal("Variable %s is recursive.", v->name);
|
|
/*NOTREACHED*/
|
|
} else {
|
|
v->flags |= VAR_IN_USE;
|
|
}
|
|
/*
|
|
* Before doing any modification, we have to make sure the value
|
|
* has been fully expanded. If it looks like recursion might be
|
|
* necessary (there's a dollar sign somewhere in the variable's value)
|
|
* we just call Var_Subst to do any other substitutions that are
|
|
* necessary. Note that the value returned by Var_Subst will have
|
|
* been dynamically-allocated, so it will need freeing when we
|
|
* return.
|
|
*/
|
|
str = (char *)Buf_GetAll(v->val, (int *)NULL);
|
|
if (strchr (str, '$') != (char *)NULL) {
|
|
str = Var_Subst(NULL, str, ctxt, err);
|
|
*freePtr = TRUE;
|
|
}
|
|
|
|
v->flags &= ~VAR_IN_USE;
|
|
|
|
/*
|
|
* Now we need to apply any modifiers the user wants applied.
|
|
* These are:
|
|
* :M<pattern> words which match the given <pattern>.
|
|
* <pattern> is of the standard file
|
|
* wildcarding form.
|
|
* :S<d><pat1><d><pat2><d>[g]
|
|
* Substitute <pat2> for <pat1> in the value
|
|
* :H Substitute the head of each word
|
|
* :T Substitute the tail of each word
|
|
* :E Substitute the extension (minus '.') of
|
|
* each word
|
|
* :R Substitute the root of each word
|
|
* (pathname minus the suffix).
|
|
* :lhs=rhs Like :S, but the rhs goes to the end of
|
|
* the invocation.
|
|
*/
|
|
if ((str != (char *)NULL) && haveModifier) {
|
|
/*
|
|
* Skip initial colon while putting it back.
|
|
*/
|
|
*tstr++ = ':';
|
|
while (*tstr != endc) {
|
|
char *newStr; /* New value to return */
|
|
char termc; /* Character which terminated scan */
|
|
|
|
if (DEBUG(VAR)) {
|
|
printf("Applying :%c to \"%s\"\n", *tstr, str);
|
|
}
|
|
switch (*tstr) {
|
|
case 'N':
|
|
case 'M':
|
|
{
|
|
char *pattern;
|
|
char *cp2;
|
|
Boolean copy;
|
|
|
|
copy = FALSE;
|
|
for (cp = tstr + 1;
|
|
*cp != '\0' && *cp != ':' && *cp != endc;
|
|
cp++)
|
|
{
|
|
if (*cp == '\\' && (cp[1] == ':' || cp[1] == endc)){
|
|
copy = TRUE;
|
|
cp++;
|
|
}
|
|
}
|
|
termc = *cp;
|
|
*cp = '\0';
|
|
if (copy) {
|
|
/*
|
|
* Need to compress the \:'s out of the pattern, so
|
|
* allocate enough room to hold the uncompressed
|
|
* pattern (note that cp started at tstr+1, so
|
|
* cp - tstr takes the null byte into account) and
|
|
* compress the pattern into the space.
|
|
*/
|
|
pattern = emalloc(cp - tstr);
|
|
for (cp2 = pattern, cp = tstr + 1;
|
|
*cp != '\0';
|
|
cp++, cp2++)
|
|
{
|
|
if ((*cp == '\\') &&
|
|
(cp[1] == ':' || cp[1] == endc)) {
|
|
cp++;
|
|
}
|
|
*cp2 = *cp;
|
|
}
|
|
*cp2 = '\0';
|
|
} else {
|
|
pattern = &tstr[1];
|
|
}
|
|
if (*tstr == 'M' || *tstr == 'm') {
|
|
newStr = VarModify(str, VarMatch, (ClientData)pattern);
|
|
} else {
|
|
newStr = VarModify(str, VarNoMatch,
|
|
(ClientData)pattern);
|
|
}
|
|
if (copy) {
|
|
free(pattern);
|
|
}
|
|
break;
|
|
}
|
|
case 'S':
|
|
{
|
|
VarPattern pattern;
|
|
register char delim;
|
|
Buffer buf; /* Buffer for patterns */
|
|
|
|
pattern.flags = 0;
|
|
delim = tstr[1];
|
|
tstr += 2;
|
|
/*
|
|
* If pattern begins with '^', it is anchored to the
|
|
* start of the word -- skip over it and flag pattern.
|
|
*/
|
|
if (*tstr == '^') {
|
|
pattern.flags |= VAR_MATCH_START;
|
|
tstr += 1;
|
|
}
|
|
|
|
buf = Buf_Init(0);
|
|
|
|
/*
|
|
* Pass through the lhs looking for 1) escaped delimiters,
|
|
* '$'s and backslashes (place the escaped character in
|
|
* uninterpreted) and 2) unescaped $'s that aren't before
|
|
* the delimiter (expand the variable substitution).
|
|
* The result is left in the Buffer buf.
|
|
*/
|
|
for (cp = tstr; *cp != '\0' && *cp != delim; cp++) {
|
|
if ((*cp == '\\') &&
|
|
((cp[1] == delim) ||
|
|
(cp[1] == '$') ||
|
|
(cp[1] == '\\')))
|
|
{
|
|
Buf_AddByte(buf, (Byte)cp[1]);
|
|
cp++;
|
|
} else if (*cp == '$') {
|
|
if (cp[1] != delim) {
|
|
/*
|
|
* If unescaped dollar sign not before the
|
|
* delimiter, assume it's a variable
|
|
* substitution and recurse.
|
|
*/
|
|
char *cp2;
|
|
int len;
|
|
Boolean freeIt;
|
|
|
|
cp2 = Var_Parse(cp, ctxt, err, &len, &freeIt);
|
|
Buf_AddBytes(buf, strlen(cp2), (Byte *)cp2);
|
|
if (freeIt) {
|
|
free(cp2);
|
|
}
|
|
cp += len - 1;
|
|
} else {
|
|
/*
|
|
* Unescaped $ at end of pattern => anchor
|
|
* pattern at end.
|
|
*/
|
|
pattern.flags |= VAR_MATCH_END;
|
|
}
|
|
} else {
|
|
Buf_AddByte(buf, (Byte)*cp);
|
|
}
|
|
}
|
|
|
|
Buf_AddByte(buf, (Byte)'\0');
|
|
|
|
/*
|
|
* If lhs didn't end with the delimiter, complain and
|
|
* return NULL
|
|
*/
|
|
if (*cp != delim) {
|
|
*lengthPtr = cp - start + 1;
|
|
if (*freePtr) {
|
|
free(str);
|
|
}
|
|
Buf_Destroy(buf, TRUE);
|
|
Error("Unclosed substitution for %s (%c missing)",
|
|
v->name, delim);
|
|
return (var_Error);
|
|
}
|
|
|
|
/*
|
|
* Fetch pattern and destroy buffer, but preserve the data
|
|
* in it, since that's our lhs. Note that Buf_GetAll
|
|
* will return the actual number of bytes, which includes
|
|
* the null byte, so we have to decrement the length by
|
|
* one.
|
|
*/
|
|
pattern.lhs = (char *)Buf_GetAll(buf, &pattern.leftLen);
|
|
pattern.leftLen--;
|
|
Buf_Destroy(buf, FALSE);
|
|
|
|
/*
|
|
* Now comes the replacement string. Three things need to
|
|
* be done here: 1) need to compress escaped delimiters and
|
|
* ampersands and 2) need to replace unescaped ampersands
|
|
* with the l.h.s. (since this isn't regexp, we can do
|
|
* it right here) and 3) expand any variable substitutions.
|
|
*/
|
|
buf = Buf_Init(0);
|
|
|
|
tstr = cp + 1;
|
|
for (cp = tstr; *cp != '\0' && *cp != delim; cp++) {
|
|
if ((*cp == '\\') &&
|
|
((cp[1] == delim) ||
|
|
(cp[1] == '&') ||
|
|
(cp[1] == '\\') ||
|
|
(cp[1] == '$')))
|
|
{
|
|
Buf_AddByte(buf, (Byte)cp[1]);
|
|
cp++;
|
|
} else if ((*cp == '$') && (cp[1] != delim)) {
|
|
char *cp2;
|
|
int len;
|
|
Boolean freeIt;
|
|
|
|
cp2 = Var_Parse(cp, ctxt, err, &len, &freeIt);
|
|
Buf_AddBytes(buf, strlen(cp2), (Byte *)cp2);
|
|
cp += len - 1;
|
|
if (freeIt) {
|
|
free(cp2);
|
|
}
|
|
} else if (*cp == '&') {
|
|
Buf_AddBytes(buf, pattern.leftLen,
|
|
(Byte *)pattern.lhs);
|
|
} else {
|
|
Buf_AddByte(buf, (Byte)*cp);
|
|
}
|
|
}
|
|
|
|
Buf_AddByte(buf, (Byte)'\0');
|
|
|
|
/*
|
|
* If didn't end in delimiter character, complain
|
|
*/
|
|
if (*cp != delim) {
|
|
*lengthPtr = cp - start + 1;
|
|
if (*freePtr) {
|
|
free(str);
|
|
}
|
|
Buf_Destroy(buf, TRUE);
|
|
Error("Unclosed substitution for %s (%c missing)",
|
|
v->name, delim);
|
|
return (var_Error);
|
|
}
|
|
|
|
pattern.rhs = (char *)Buf_GetAll(buf, &pattern.rightLen);
|
|
pattern.rightLen--;
|
|
Buf_Destroy(buf, FALSE);
|
|
|
|
/*
|
|
* Check for global substitution. If 'g' after the final
|
|
* delimiter, substitution is global and is marked that
|
|
* way.
|
|
*/
|
|
cp++;
|
|
if (*cp == 'g') {
|
|
pattern.flags |= VAR_SUB_GLOBAL;
|
|
cp++;
|
|
}
|
|
|
|
termc = *cp;
|
|
newStr = VarModify(str, VarSubstitute,
|
|
(ClientData)&pattern);
|
|
/*
|
|
* Free the two strings.
|
|
*/
|
|
free(pattern.lhs);
|
|
free(pattern.rhs);
|
|
break;
|
|
}
|
|
case 'T':
|
|
if (tstr[1] == endc || tstr[1] == ':') {
|
|
newStr = VarModify (str, VarTail, (ClientData)0);
|
|
cp = tstr + 1;
|
|
termc = *cp;
|
|
break;
|
|
}
|
|
/*FALLTHRU*/
|
|
case 'H':
|
|
if (tstr[1] == endc || tstr[1] == ':') {
|
|
newStr = VarModify (str, VarHead, (ClientData)0);
|
|
cp = tstr + 1;
|
|
termc = *cp;
|
|
break;
|
|
}
|
|
/*FALLTHRU*/
|
|
case 'E':
|
|
if (tstr[1] == endc || tstr[1] == ':') {
|
|
newStr = VarModify (str, VarSuffix, (ClientData)0);
|
|
cp = tstr + 1;
|
|
termc = *cp;
|
|
break;
|
|
}
|
|
/*FALLTHRU*/
|
|
case 'R':
|
|
if (tstr[1] == endc || tstr[1] == ':') {
|
|
newStr = VarModify (str, VarRoot, (ClientData)0);
|
|
cp = tstr + 1;
|
|
termc = *cp;
|
|
break;
|
|
}
|
|
/*FALLTHRU*/
|
|
default: {
|
|
/*
|
|
* This can either be a bogus modifier or a System-V
|
|
* substitution command.
|
|
*/
|
|
VarPattern pattern;
|
|
Boolean eqFound;
|
|
|
|
pattern.flags = 0;
|
|
eqFound = FALSE;
|
|
/*
|
|
* First we make a pass through the string trying
|
|
* to verify it is a SYSV-make-style translation:
|
|
* it must be: <string1>=<string2>)
|
|
*/
|
|
for (cp = tstr; *cp != '\0' && *cp != endc; cp++) {
|
|
if (*cp == '=') {
|
|
eqFound = TRUE;
|
|
/* continue looking for endc */
|
|
}
|
|
}
|
|
if (*cp == endc && eqFound) {
|
|
|
|
/*
|
|
* Now we break this sucker into the lhs and
|
|
* rhs. We must null terminate them of course.
|
|
*/
|
|
for (cp = tstr; *cp != '='; cp++)
|
|
continue;
|
|
pattern.lhs = tstr;
|
|
pattern.leftLen = cp - tstr;
|
|
*cp++ = '\0';
|
|
|
|
pattern.rhs = cp;
|
|
while (*cp != endc) {
|
|
cp++;
|
|
}
|
|
pattern.rightLen = cp - pattern.rhs;
|
|
*cp = '\0';
|
|
|
|
/*
|
|
* SYSV modifications happen through the whole
|
|
* string. Note the pattern is anchored at the end.
|
|
*/
|
|
newStr = VarModify(str, VarSYSVMatch,
|
|
(ClientData)&pattern);
|
|
|
|
/*
|
|
* Restore the nulled characters
|
|
*/
|
|
pattern.lhs[pattern.leftLen] = '=';
|
|
pattern.rhs[pattern.rightLen] = endc;
|
|
termc = endc;
|
|
} else {
|
|
Error ("Unknown modifier '%c'\n", *tstr);
|
|
for (cp = tstr+1;
|
|
*cp != ':' && *cp != endc && *cp != '\0';
|
|
cp++)
|
|
continue;
|
|
termc = *cp;
|
|
newStr = var_Error;
|
|
}
|
|
}
|
|
}
|
|
if (DEBUG(VAR)) {
|
|
printf("Result is \"%s\"\n", newStr);
|
|
}
|
|
|
|
if (*freePtr) {
|
|
free (str);
|
|
}
|
|
str = newStr;
|
|
if (str != var_Error) {
|
|
*freePtr = TRUE;
|
|
} else {
|
|
*freePtr = FALSE;
|
|
}
|
|
if (termc == '\0') {
|
|
Error("Unclosed variable specification for %s", v->name);
|
|
} else if (termc == ':') {
|
|
*cp++ = termc;
|
|
} else {
|
|
*cp = termc;
|
|
}
|
|
tstr = cp;
|
|
}
|
|
*lengthPtr = tstr - start + 1;
|
|
} else {
|
|
*lengthPtr = tstr - start + 1;
|
|
*tstr = endc;
|
|
}
|
|
|
|
if (v->flags & VAR_FROM_ENV) {
|
|
Boolean destroy = FALSE;
|
|
|
|
if (str != (char *)Buf_GetAll(v->val, (int *)NULL)) {
|
|
destroy = TRUE;
|
|
} else {
|
|
/*
|
|
* Returning the value unmodified, so tell the caller to free
|
|
* the thing.
|
|
*/
|
|
*freePtr = TRUE;
|
|
}
|
|
Buf_Destroy(v->val, destroy);
|
|
free((Address)v);
|
|
} else if (v->flags & VAR_JUNK) {
|
|
/*
|
|
* Perform any free'ing needed and set *freePtr to FALSE so the caller
|
|
* doesn't try to free a static pointer.
|
|
*/
|
|
if (*freePtr) {
|
|
free(str);
|
|
}
|
|
*freePtr = FALSE;
|
|
free((Address)v);
|
|
if (dynamic) {
|
|
str = emalloc(*lengthPtr + 1);
|
|
strncpy(str, start, *lengthPtr);
|
|
str[*lengthPtr] = '\0';
|
|
*freePtr = TRUE;
|
|
} else {
|
|
str = var_Error;
|
|
}
|
|
}
|
|
return (str);
|
|
}
|
|
|
|
/*-
|
|
*-----------------------------------------------------------------------
|
|
* Var_Subst --
|
|
* Substitute for all variables in the given string in the given context
|
|
* If undefErr is TRUE, Parse_Error will be called when an undefined
|
|
* variable is encountered.
|
|
*
|
|
* Results:
|
|
* The resulting string.
|
|
*
|
|
* Side Effects:
|
|
* None. The old string must be freed by the caller
|
|
*-----------------------------------------------------------------------
|
|
*/
|
|
char *
|
|
Var_Subst (var, str, ctxt, undefErr)
|
|
char *var; /* Named variable || NULL for all */
|
|
char *str; /* the string in which to substitute */
|
|
GNode *ctxt; /* the context wherein to find variables */
|
|
Boolean undefErr; /* TRUE if undefineds are an error */
|
|
{
|
|
Buffer buf; /* Buffer for forming things */
|
|
char *val; /* Value to substitute for a variable */
|
|
int length; /* Length of the variable invocation */
|
|
Boolean doFree; /* Set true if val should be freed */
|
|
static Boolean errorReported; /* Set true if an error has already
|
|
* been reported to prevent a plethora
|
|
* of messages when recursing */
|
|
|
|
buf = Buf_Init (MAKE_BSIZE);
|
|
errorReported = FALSE;
|
|
|
|
while (*str) {
|
|
if (var == NULL && (*str == '$') && (str[1] == '$')) {
|
|
/*
|
|
* A dollar sign may be escaped either with another dollar sign.
|
|
* In such a case, we skip over the escape character and store the
|
|
* dollar sign into the buffer directly.
|
|
*/
|
|
str++;
|
|
Buf_AddByte(buf, (Byte)*str);
|
|
str++;
|
|
} else if (*str != '$') {
|
|
/*
|
|
* Skip as many characters as possible -- either to the end of
|
|
* the string or to the next dollar sign (variable invocation).
|
|
*/
|
|
char *cp;
|
|
|
|
for (cp = str++; *str != '$' && *str != '\0'; str++)
|
|
continue;
|
|
Buf_AddBytes(buf, str - cp, (Byte *)cp);
|
|
} else {
|
|
if (var != NULL) {
|
|
int expand;
|
|
for (;;) {
|
|
if (str[1] != '(' && str[1] != '{') {
|
|
if (str[1] != *var) {
|
|
Buf_AddBytes(buf, 2, (Byte *) str);
|
|
str += 2;
|
|
expand = FALSE;
|
|
}
|
|
else
|
|
expand = TRUE;
|
|
break;
|
|
}
|
|
else {
|
|
char *p;
|
|
|
|
/*
|
|
* Scan up to the end of the variable name.
|
|
*/
|
|
for (p = &str[2]; *p &&
|
|
*p != ':' && *p != ')' && *p != '}'; p++)
|
|
if (*p == '$')
|
|
break;
|
|
/*
|
|
* A variable inside the variable. We cannot expand
|
|
* the external variable yet, so we try again with
|
|
* the nested one
|
|
*/
|
|
if (*p == '$') {
|
|
Buf_AddBytes(buf, p - str, (Byte *) str);
|
|
str = p;
|
|
continue;
|
|
}
|
|
|
|
if (strncmp(var, str + 2, p - str - 2) != 0 ||
|
|
var[p - str - 2] != '\0') {
|
|
/*
|
|
* Not the variable we want to expand, scan
|
|
* until the next variable
|
|
*/
|
|
for (;*p != '$' && *p != '\0'; p++)
|
|
continue;
|
|
Buf_AddBytes(buf, p - str, (Byte *) str);
|
|
str = p;
|
|
expand = FALSE;
|
|
}
|
|
else
|
|
expand = TRUE;
|
|
break;
|
|
}
|
|
}
|
|
if (!expand)
|
|
continue;
|
|
}
|
|
|
|
val = Var_Parse (str, ctxt, undefErr, &length, &doFree);
|
|
|
|
/*
|
|
* When we come down here, val should either point to the
|
|
* value of this variable, suitably modified, or be NULL.
|
|
* Length should be the total length of the potential
|
|
* variable invocation (from $ to end character...)
|
|
*/
|
|
if (val == var_Error || val == varNoError) {
|
|
/*
|
|
* If performing old-time variable substitution, skip over
|
|
* the variable and continue with the substitution. Otherwise,
|
|
* store the dollar sign and advance str so we continue with
|
|
* the string...
|
|
*/
|
|
if (oldVars) {
|
|
str += length;
|
|
} else if (undefErr) {
|
|
/*
|
|
* If variable is undefined, complain and skip the
|
|
* variable. The complaint will stop us from doing anything
|
|
* when the file is parsed.
|
|
*/
|
|
if (!errorReported) {
|
|
Parse_Error (PARSE_FATAL,
|
|
"Undefined variable \"%.*s\"",length,str);
|
|
}
|
|
str += length;
|
|
errorReported = TRUE;
|
|
} else {
|
|
Buf_AddByte (buf, (Byte)*str);
|
|
str += 1;
|
|
}
|
|
} else {
|
|
/*
|
|
* We've now got a variable structure to store in. But first,
|
|
* advance the string pointer.
|
|
*/
|
|
str += length;
|
|
|
|
/*
|
|
* Copy all the characters from the variable value straight
|
|
* into the new string.
|
|
*/
|
|
Buf_AddBytes (buf, strlen (val), (Byte *)val);
|
|
if (doFree) {
|
|
free ((Address)val);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
Buf_AddByte (buf, '\0');
|
|
str = (char *)Buf_GetAll (buf, (int *)NULL);
|
|
Buf_Destroy (buf, FALSE);
|
|
return (str);
|
|
}
|
|
|
|
/*-
|
|
*-----------------------------------------------------------------------
|
|
* Var_GetTail --
|
|
* Return the tail from each of a list of words. Used to set the
|
|
* System V local variables.
|
|
*
|
|
* Results:
|
|
* The resulting string.
|
|
*
|
|
* Side Effects:
|
|
* None.
|
|
*
|
|
*-----------------------------------------------------------------------
|
|
*/
|
|
char *
|
|
Var_GetTail(file)
|
|
char *file; /* Filename to modify */
|
|
{
|
|
return(VarModify(file, VarTail, (ClientData)0));
|
|
}
|
|
|
|
/*-
|
|
*-----------------------------------------------------------------------
|
|
* Var_GetHead --
|
|
* Find the leading components of a (list of) filename(s).
|
|
* XXX: VarHead does not replace foo by ., as (sun) System V make
|
|
* does.
|
|
*
|
|
* Results:
|
|
* The leading components.
|
|
*
|
|
* Side Effects:
|
|
* None.
|
|
*
|
|
*-----------------------------------------------------------------------
|
|
*/
|
|
char *
|
|
Var_GetHead(file)
|
|
char *file; /* Filename to manipulate */
|
|
{
|
|
return(VarModify(file, VarHead, (ClientData)0));
|
|
}
|
|
|
|
/*-
|
|
*-----------------------------------------------------------------------
|
|
* Var_Init --
|
|
* Initialize the module
|
|
*
|
|
* Results:
|
|
* None
|
|
*
|
|
* Side Effects:
|
|
* The VAR_CMD and VAR_GLOBAL contexts are created
|
|
*-----------------------------------------------------------------------
|
|
*/
|
|
void
|
|
Var_Init ()
|
|
{
|
|
VAR_GLOBAL = Targ_NewGN ("Global");
|
|
VAR_CMD = Targ_NewGN ("Command");
|
|
|
|
}
|
|
|
|
/****************** PRINT DEBUGGING INFO *****************/
|
|
static int
|
|
VarPrintVar (v)
|
|
Var *v;
|
|
{
|
|
printf ("%-16s = %s\n", v->name, (char *) Buf_GetAll(v->val, (int *)NULL));
|
|
return (0);
|
|
}
|
|
|
|
/*-
|
|
*-----------------------------------------------------------------------
|
|
* Var_Dump --
|
|
* print all variables in a context
|
|
*-----------------------------------------------------------------------
|
|
*/
|
|
void
|
|
Var_Dump (ctxt)
|
|
GNode *ctxt;
|
|
{
|
|
Lst_ForEach (ctxt->context, VarPrintVar);
|
|
}
|