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freebsd-dev/usr.bin/make/var.c

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/*
* Copyright (c) 1988, 1989, 1990, 1993
* The Regents of the University of California. All rights reserved.
* Copyright (c) 1989 by Berkeley Softworks
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Adam de Boor.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
#if 0
static char sccsid[] = "@(#)var.c 8.3 (Berkeley) 3/19/94";
#else
static const char rcsid[] =
"$FreeBSD$";
#endif
#endif /* not lint */
/*-
* var.c --
* Variable-handling functions
*
* Interface:
* Var_Set Set the value of a variable in the given
* context. The variable is created if it doesn't
* yet exist. The value and variable name need not
* be preserved.
*
* Var_Append Append more characters to an existing variable
* in the given context. The variable needn't
* exist already -- it will be created if it doesn't.
* A space is placed between the old value and the
* new one.
*
* Var_Exists See if a variable exists.
*
* Var_Value Return the value of a variable in a context or
* NULL if the variable is undefined.
*
* Var_Subst Substitute named variable, or all variables if
* NULL in a string using
* the given context as the top-most one. If the
* third argument is non-zero, Parse_Error is
* called if any variables are undefined.
*
* Var_Parse Parse a variable expansion from a string and
* return the result and the number of characters
* consumed.
*
* Var_Delete Delete a variable in a context.
*
* Var_Init Initialize this module.
*
* Debugging:
* Var_Dump Print out all variables defined in the given
* context.
*
* XXX: There's a lot of duplication in these functions.
*/
#include <ctype.h>
#include <stdlib.h>
#include "make.h"
#include "buf.h"
/*
* This is a harmless return value for Var_Parse that can be used by Var_Subst
* to determine if there was an error in parsing -- easier than returning
* a flag, as things outside this module don't give a hoot.
*/
char var_Error[] = "";
/*
* Similar to var_Error, but returned when the 'err' flag for Var_Parse is
* set false. Why not just use a constant? Well, gcc likes to condense
* identical string instances...
*/
static char varNoError[] = "";
/*
* Internally, variables are contained in four different contexts.
* 1) the environment. They may not be changed. If an environment
* variable is appended-to, the result is placed in the global
* context.
* 2) the global context. Variables set in the Makefile are located in
* the global context. It is the penultimate context searched when
* substituting.
* 3) the command-line context. All variables set on the command line
* are placed in this context. They are UNALTERABLE once placed here.
* 4) the local context. Each target has associated with it a context
* list. On this list are located the structures describing such
* local variables as $(@) and $(*)
* The four contexts are searched in the reverse order from which they are
* listed.
*/
GNode *VAR_GLOBAL; /* variables from the makefile */
GNode *VAR_CMD; /* variables defined on the command-line */
static Lst allVars; /* List of all variables */
#define FIND_CMD 0x1 /* look in VAR_CMD when searching */
#define FIND_GLOBAL 0x2 /* look in VAR_GLOBAL as well */
#define FIND_ENV 0x4 /* look in the environment also */
typedef struct Var {
char *name; /* the variable's name */
Buffer val; /* its value */
int flags; /* miscellaneous status flags */
#define VAR_IN_USE 1 /* Variable's value currently being used.
* Used to avoid recursion */
#define VAR_FROM_ENV 2 /* Variable comes from the environment */
#define VAR_JUNK 4 /* Variable is a junk variable that
* should be destroyed when done with
* it. Used by Var_Parse for undefined,
* modified variables */
} Var;
/* Var*Pattern flags */
#define VAR_SUB_GLOBAL 0x01 /* Apply substitution globally */
#define VAR_MATCH_START 0x08 /* Match at start of word */
#define VAR_MATCH_END 0x10 /* Match at end of word */
typedef struct {
char *lhs; /* String to match */
int leftLen; /* Length of string */
char *rhs; /* Replacement string (w/ &'s removed) */
int rightLen; /* Length of replacement */
int flags;
} VarPattern;
static int VarCmp __P((ClientData, ClientData));
static Var *VarFind __P((char *, GNode *, int));
static void VarAdd __P((char *, char *, GNode *));
static void VarDelete __P((ClientData));
static Boolean VarHead __P((char *, Boolean, Buffer, ClientData));
static Boolean VarTail __P((char *, Boolean, Buffer, ClientData));
static Boolean VarSuffix __P((char *, Boolean, Buffer, ClientData));
static Boolean VarRoot __P((char *, Boolean, Buffer, ClientData));
static Boolean VarMatch __P((char *, Boolean, Buffer, ClientData));
#ifdef SYSVVARSUB
static Boolean VarSYSVMatch __P((char *, Boolean, Buffer, ClientData));
#endif
static Boolean VarNoMatch __P((char *, Boolean, Buffer, ClientData));
static Boolean VarSubstitute __P((char *, Boolean, Buffer, ClientData));
static char *VarQuote __P((char *));
static char *VarModify __P((char *, Boolean (*)(char *, Boolean, Buffer,
ClientData),
ClientData));
static int VarPrintVar __P((ClientData, ClientData));
/*-
*-----------------------------------------------------------------------
* VarCmp --
* See if the given variable matches the named one. Called from
* Lst_Find when searching for a variable of a given name.
*
* Results:
* 0 if they match. non-zero otherwise.
*
* Side Effects:
* none
*-----------------------------------------------------------------------
*/
static int
VarCmp (v, name)
ClientData v; /* VAR structure to compare */
ClientData name; /* name to look for */
{
return (strcmp ((char *) name, ((Var *) v)->name));
}
/*-
*-----------------------------------------------------------------------
* VarFind --
* Find the given variable in the given context and any other contexts
* indicated.
*
* Results:
* A pointer to the structure describing the desired variable or
* NIL if the variable does not exist.
*
* Side Effects:
* None
*-----------------------------------------------------------------------
*/
static Var *
VarFind (name, ctxt, flags)
char *name; /* name to find */
GNode *ctxt; /* context in which to find it */
int flags; /* FIND_GLOBAL set means to look in the
* VAR_GLOBAL context as well.
* FIND_CMD set means to look in the VAR_CMD
* context also.
* FIND_ENV set means to look in the
* environment */
{
Boolean localCheckEnvFirst;
LstNode var;
Var *v;
/*
* If the variable name begins with a '.', it could very well be one of
* the local ones. We check the name against all the local variables
* and substitute the short version in for 'name' if it matches one of
* them.
*/
if (*name == '.' && isupper((unsigned char) name[1]))
switch (name[1]) {
case 'A':
if (!strcmp(name, ".ALLSRC"))
name = ALLSRC;
if (!strcmp(name, ".ARCHIVE"))
name = ARCHIVE;
break;
case 'I':
if (!strcmp(name, ".IMPSRC"))
name = IMPSRC;
break;
case 'M':
if (!strcmp(name, ".MEMBER"))
name = MEMBER;
break;
case 'O':
if (!strcmp(name, ".OODATE"))
name = OODATE;
break;
case 'P':
if (!strcmp(name, ".PREFIX"))
name = PREFIX;
break;
case 'T':
if (!strcmp(name, ".TARGET"))
name = TARGET;
break;
}
/*
* Note whether this is one of the specific variables we were told through
* the -E flag to use environment-variable-override for.
*/
if (Lst_Find (envFirstVars, (ClientData)name,
(int (*)(ClientData, ClientData)) strcmp) != NILLNODE)
{
localCheckEnvFirst = TRUE;
} else {
localCheckEnvFirst = FALSE;
}
/*
* First look for the variable in the given context. If it's not there,
* look for it in VAR_CMD, VAR_GLOBAL and the environment, in that order,
* depending on the FIND_* flags in 'flags'
*/
var = Lst_Find (ctxt->context, (ClientData)name, VarCmp);
if ((var == NILLNODE) && (flags & FIND_CMD) && (ctxt != VAR_CMD)) {
var = Lst_Find (VAR_CMD->context, (ClientData)name, VarCmp);
}
if ((var == NILLNODE) && (flags & FIND_GLOBAL) && (ctxt != VAR_GLOBAL) &&
!checkEnvFirst && !localCheckEnvFirst)
{
var = Lst_Find (VAR_GLOBAL->context, (ClientData)name, VarCmp);
}
if ((var == NILLNODE) && (flags & FIND_ENV)) {
char *env;
if ((env = getenv (name)) != NULL) {
int len;
v = (Var *) emalloc(sizeof(Var));
v->name = estrdup(name);
len = strlen(env);
v->val = Buf_Init(len);
Buf_AddBytes(v->val, len, (Byte *)env);
v->flags = VAR_FROM_ENV;
return (v);
} else if ((checkEnvFirst || localCheckEnvFirst) &&
(flags & FIND_GLOBAL) && (ctxt != VAR_GLOBAL))
{
var = Lst_Find (VAR_GLOBAL->context, (ClientData)name, VarCmp);
if (var == NILLNODE) {
return ((Var *) NIL);
} else {
return ((Var *)Lst_Datum(var));
}
} else {
return((Var *)NIL);
}
} else if (var == NILLNODE) {
return ((Var *) NIL);
} else {
return ((Var *) Lst_Datum (var));
}
}
/*-
*-----------------------------------------------------------------------
* VarAdd --
* Add a new variable of name name and value val to the given context
*
* Results:
* None
*
* Side Effects:
* The new variable is placed at the front of the given context
* The name and val arguments are duplicated so they may
* safely be freed.
*-----------------------------------------------------------------------
*/
static void
VarAdd (name, val, ctxt)
char *name; /* name of variable to add */
char *val; /* value to set it to */
GNode *ctxt; /* context in which to set it */
{
register Var *v;
int len;
v = (Var *) emalloc (sizeof (Var));
v->name = estrdup (name);
len = val ? strlen(val) : 0;
v->val = Buf_Init(len+1);
Buf_AddBytes(v->val, len, (Byte *)val);
v->flags = 0;
(void) Lst_AtFront (ctxt->context, (ClientData)v);
(void) Lst_AtEnd (allVars, (ClientData) v);
if (DEBUG(VAR)) {
printf("%s:%s = %s\n", ctxt->name, name, val);
}
}
/*-
*-----------------------------------------------------------------------
* VarDelete --
* Delete a variable and all the space associated with it.
*
* Results:
* None
*
* Side Effects:
* None
*-----------------------------------------------------------------------
*/
static void
VarDelete(vp)
ClientData vp;
{
Var *v = (Var *) vp;
free(v->name);
Buf_Destroy(v->val, TRUE);
free((Address) v);
}
/*-
*-----------------------------------------------------------------------
* Var_Delete --
* Remove a variable from a context.
*
* Results:
* None.
*
* Side Effects:
* The Var structure is removed and freed.
*
*-----------------------------------------------------------------------
*/
void
Var_Delete(name, ctxt)
char *name;
GNode *ctxt;
{
LstNode ln;
if (DEBUG(VAR)) {
printf("%s:delete %s\n", ctxt->name, name);
}
ln = Lst_Find(ctxt->context, (ClientData)name, VarCmp);
if (ln != NILLNODE) {
register Var *v;
v = (Var *)Lst_Datum(ln);
Lst_Remove(ctxt->context, ln);
ln = Lst_Member(allVars, v);
Lst_Remove(allVars, ln);
VarDelete((ClientData) v);
}
}
/*-
*-----------------------------------------------------------------------
* Var_Set --
* Set the variable name to the value val in the given context.
*
* Results:
* None.
*
* Side Effects:
* If the variable doesn't yet exist, a new record is created for it.
* Else the old value is freed and the new one stuck in its place
*
* Notes:
* The variable is searched for only in its context before being
* created in that context. I.e. if the context is VAR_GLOBAL,
* only VAR_GLOBAL->context is searched. Likewise if it is VAR_CMD, only
* VAR_CMD->context is searched. This is done to avoid the literally
* thousands of unnecessary strcmp's that used to be done to
* set, say, $(@) or $(<).
*-----------------------------------------------------------------------
*/
void
Var_Set (name, val, ctxt)
char *name; /* name of variable to set */
char *val; /* value to give to the variable */
GNode *ctxt; /* context in which to set it */
{
register Var *v;
/*
* We only look for a variable in the given context since anything set
* here will override anything in a lower context, so there's not much
* point in searching them all just to save a bit of memory...
*/
v = VarFind (name, ctxt, 0);
if (v == (Var *) NIL) {
VarAdd (name, val, ctxt);
} else {
Buf_Discard(v->val, Buf_Size(v->val));
Buf_AddBytes(v->val, strlen(val), (Byte *)val);
if (DEBUG(VAR)) {
printf("%s:%s = %s\n", ctxt->name, name, val);
}
}
/*
* Any variables given on the command line are automatically exported
* to the environment (as per POSIX standard)
*/
if (ctxt == VAR_CMD) {
setenv(name, val, 1);
}
}
/*-
*-----------------------------------------------------------------------
* Var_Append --
* The variable of the given name has the given value appended to it in
* the given context.
*
* Results:
* None
*
* Side Effects:
* If the variable doesn't exist, it is created. Else the strings
* are concatenated (with a space in between).
*
* Notes:
* Only if the variable is being sought in the global context is the
* environment searched.
* XXX: Knows its calling circumstances in that if called with ctxt
* an actual target, it will only search that context since only
* a local variable could be being appended to. This is actually
* a big win and must be tolerated.
*-----------------------------------------------------------------------
*/
void
Var_Append (name, val, ctxt)
char *name; /* Name of variable to modify */
char *val; /* String to append to it */
GNode *ctxt; /* Context in which this should occur */
{
register Var *v;
v = VarFind (name, ctxt, (ctxt == VAR_GLOBAL) ? FIND_ENV : 0);
if (v == (Var *) NIL) {
VarAdd (name, val, ctxt);
} else {
Buf_AddByte(v->val, (Byte)' ');
Buf_AddBytes(v->val, strlen(val), (Byte *)val);
if (DEBUG(VAR)) {
printf("%s:%s = %s\n", ctxt->name, name,
(char *) Buf_GetAll(v->val, (int *)NULL));
}
if (v->flags & VAR_FROM_ENV) {
/*
* If the original variable came from the environment, we
* have to install it in the global context (we could place
* it in the environment, but then we should provide a way to
* export other variables...)
*/
v->flags &= ~VAR_FROM_ENV;
Lst_AtFront(ctxt->context, (ClientData)v);
}
}
}
/*-
*-----------------------------------------------------------------------
* Var_Exists --
* See if the given variable exists.
*
* Results:
* TRUE if it does, FALSE if it doesn't
*
* Side Effects:
* None.
*
*-----------------------------------------------------------------------
*/
Boolean
Var_Exists(name, ctxt)
char *name; /* Variable to find */
GNode *ctxt; /* Context in which to start search */
{
Var *v;
v = VarFind(name, ctxt, FIND_CMD|FIND_GLOBAL|FIND_ENV);
if (v == (Var *)NIL) {
return(FALSE);
} else if (v->flags & VAR_FROM_ENV) {
free(v->name);
Buf_Destroy(v->val, TRUE);
free((char *)v);
}
return(TRUE);
}
/*-
*-----------------------------------------------------------------------
* Var_Value --
* Return the value of the named variable in the given context
*
* Results:
* The value if the variable exists, NULL if it doesn't
*
* Side Effects:
* None
*-----------------------------------------------------------------------
*/
char *
Var_Value (name, ctxt, frp)
char *name; /* name to find */
GNode *ctxt; /* context in which to search for it */
char **frp;
{
Var *v;
v = VarFind (name, ctxt, FIND_ENV | FIND_GLOBAL | FIND_CMD);
*frp = NULL;
if (v != (Var *) NIL) {
char *p = ((char *)Buf_GetAll(v->val, (int *)NULL));
if (v->flags & VAR_FROM_ENV) {
Buf_Destroy(v->val, FALSE);
free((Address) v);
*frp = p;
}
return p;
} 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, dummy)
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 */
ClientData dummy;
{
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(dummy ? TRUE : 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, dummy)
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 */
ClientData dummy;
{
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 (dummy ? TRUE : 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, dummy)
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 */
ClientData dummy;
{
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] = '.';
addSpace = TRUE;
}
return (dummy ? addSpace : 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, dummy)
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 */
ClientData dummy;
{
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 (dummy ? TRUE : 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 */
ClientData pattern; /* Pattern the word must match */
{
if (Str_Match(word, (char *) pattern)) {
if (addSpace) {
Buf_AddByte(buf, (Byte)' ');
}
addSpace = TRUE;
Buf_AddBytes(buf, strlen(word), (Byte *)word);
}
return(addSpace);
}
#ifdef SYSVVARSUB
/*-
*-----------------------------------------------------------------------
* 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, patp)
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 */
ClientData patp; /* Pattern the word must match */
{
int len;
char *ptr;
VarPattern *pat = (VarPattern *) patp;
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);
}
#endif
/*-
*-----------------------------------------------------------------------
* 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 */
ClientData pattern; /* Pattern the word must match */
{
if (!Str_Match(word, (char *) 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, patternp)
char *word; /* Word to modify */
Boolean addSpace; /* True if space should be added before
* other characters */
Buffer buf; /* Buffer for result */
ClientData patternp; /* Pattern for substitution */
{
register int wordLen; /* Length of word */
register char *cp; /* General pointer */
VarPattern *pattern = (VarPattern *) patternp;
wordLen = strlen(word);
if (1) { /* substitute in each word of the variable */
/*
* Break substitution 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
* substitutions 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 || (pattern->flags & VAR_SUB_GLOBAL) == 0){
done = TRUE;
}
} 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:
* addSpace was set TRUE if characters were added to the buffer.
*/
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 */
/* Function to use to modify them */
Boolean (*modProc) __P((char *, Boolean, Buffer, ClientData));
ClientData datum; /* Datum to pass it */
{
Buffer buf; /* Buffer for the new string */
Boolean addSpace; /* TRUE if need to add a space to the
* buffer before adding the trimmed
* word */
char **av; /* word list [first word does not count] */
int ac, i;
buf = Buf_Init (0);
addSpace = FALSE;
av = brk_string(str, &ac, FALSE);
for (i = 1; i < ac; i++)
addSpace = (*modProc)(av[i], addSpace, buf, datum);
Buf_AddByte (buf, '\0');
str = (char *)Buf_GetAll (buf, (int *)NULL);
Buf_Destroy (buf, FALSE);
return (str);
}
/*-
*-----------------------------------------------------------------------
* VarQuote --
* Quote shell meta-characters in the string
*
* Results:
* The quoted string
*
* Side Effects:
* None.
*
*-----------------------------------------------------------------------
*/
static char *
VarQuote(str)
char *str;
{
Buffer buf;
/* This should cover most shells :-( */
static char meta[] = "\n \t'`\";&<>()|*?{}[]\\$!#^~";
buf = Buf_Init (MAKE_BSIZE);
for (; *str; str++) {
if (strchr(meta, *str) != NULL)
Buf_AddByte(buf, (Byte)'\\');
Buf_AddByte(buf, (Byte)*str);
}
Buf_AddByte(buf, (Byte) '\0');
str = (char *)Buf_GetAll (buf, (int *)NULL);
Buf_Destroy (buf, FALSE);
return str;
}
/*-
*-----------------------------------------------------------------------
* 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 */
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 */
register char startc=0; /* Starting character when variable in parens
* or braces */
int cnt; /* Used to count brace pairs when variable in
* 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 */
int vlen; /* length of variable name, after embedded variable
* expansion */
*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.
*/
/* XXX: It looks like $% and $! are reversed here */
switch (str[1]) {
case '@':
return("$(.TARGET)");
case '%':
return("$(.ARCHIVE)");
case '*':
return("$(.PREFIX)");
case '!':
return("$(.MEMBER)");
}
}
/*
* Error
*/
return (err ? var_Error : varNoError);
} else {
haveModifier = FALSE;
tstr = &str[1];
endc = str[1];
}
} else {
/* build up expanded variable name in this buffer */
Buffer buf = Buf_Init(MAKE_BSIZE);
startc = str[1];
endc = startc == '(' ? ')' : '}';
/*
* Skip to the end character or a colon, whichever comes first,
* replacing embedded variables as we go.
*/
for (tstr = str + 2; *tstr != '\0' && *tstr != endc && *tstr != ':'; tstr++)
if (*tstr == '$') {
int rlen;
Boolean rfree;
char* rval = Var_Parse(tstr, ctxt, err, &rlen, &rfree);
if (rval == var_Error) {
Fatal("Error expanding embedded variable.");
} else if (rval != NULL) {
Buf_AddBytes(buf, strlen(rval), (Byte *) rval);
if (rfree)
free(rval);
}
tstr += rlen - 1;
} else
Buf_AddByte(buf, (Byte) *tstr);
if (*tstr == '\0') {
/*
* 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);
}
haveModifier = (*tstr == ':');
*tstr = '\0';
Buf_AddByte(buf, (Byte) '\0');
str = Buf_GetAll(buf, NULL);
vlen = strlen(str);
v = VarFind (str, ctxt, FIND_ENV | FIND_GLOBAL | FIND_CMD);
if ((v == (Var *)NIL) && (ctxt != VAR_CMD) && (ctxt != VAR_GLOBAL) &&
(vlen == 2) && (str[1] == 'F' || str[1] == '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[0]) {
case '@':
case '%':
case '*':
case '!':
case '>':
case '<':
{
char vname[2];
char *val;
/*
* Well, it's local -- go look for it.
*/
vname[0] = str[0];
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
* put nested invocations in them...
*/
val = (char *)Buf_GetAll(v->val, (int *)NULL);
if (str[1] == '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;
Buf_Destroy(buf, TRUE);
return(val);
}
break;
}
}
}
if (v == (Var *)NIL) {
if (((vlen == 1) ||
(((vlen == 2) && (str[1] == 'F' ||
str[1] == '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[0]) {
case '@':
case '%':
case '*':
case '!':
dynamic = TRUE;
break;
}
} else if ((vlen > 2) && (str[0] == '.') &&
isupper((unsigned char) str[1]) &&
((ctxt == VAR_CMD) || (ctxt == VAR_GLOBAL)))
{
int len;
len = vlen - 1;
if ((strncmp(str, ".TARGET", len) == 0) ||
(strncmp(str, ".ARCHIVE", len) == 0) ||
(strncmp(str, ".PREFIX", len) == 0) ||
(strncmp(str, ".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;
Buf_Destroy(buf, TRUE);
return(str);
} else {
Buf_Destroy(buf, TRUE);
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;
}
}
Buf_Destroy(buf, TRUE);
}
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 'Q':
if (tstr[1] == endc || tstr[1] == ':') {
newStr = VarQuote (str);
cp = tstr + 1;
termc = *cp;
break;
}
/*FALLTHRU*/
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*/
#ifdef SUNSHCMD
case 's':
if (tstr[1] == 'h' && (tstr[2] == endc || tstr[2] == ':')) {
char *err;
newStr = Cmd_Exec (str, &err);
if (err)
Error (err, str);
cp = tstr + 2;
termc = *cp;
break;
}
/*FALLTHRU*/
#endif
default:
{
#ifdef SYSVVARSUB
/*
* 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>)
*/
cp = tstr;
cnt = 1;
while (*cp != '\0' && cnt) {
if (*cp == '=') {
eqFound = TRUE;
/* continue looking for endc */
}
else if (*cp == endc)
cnt--;
else if (*cp == startc)
cnt++;
if (cnt)
cp++;
}
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;
cnt = 1;
while (cnt) {
if (*cp == endc)
cnt--;
else if (*cp == startc)
cnt++;
if (cnt)
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
#endif
{
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;
Buf_Destroy(v->val, TRUE);
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");
allVars = Lst_Init(FALSE);
}
void
Var_End ()
{
Lst_Destroy(allVars, VarDelete);
}
/****************** PRINT DEBUGGING INFO *****************/
static int
VarPrintVar (vp, dummy)
ClientData vp;
ClientData dummy;
{
Var *v = (Var *) vp;
printf ("%-16s = %s\n", v->name, (char *) Buf_GetAll(v->val, (int *)NULL));
return (dummy ? 0 : 0);
}
/*-
*-----------------------------------------------------------------------
* Var_Dump --
* print all variables in a context
*-----------------------------------------------------------------------
*/
void
Var_Dump (ctxt)
GNode *ctxt;
{
Lst_ForEach (ctxt->context, VarPrintVar, (ClientData) 0);
}
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