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freebsd-skq/usr.bin/make/var.c
Hartmut Brandt 34d49b885f Finish constification of Var_Parse() and Var_Subst(). 
Patch:		0.18, 0.8, 7.110

Submitted by:	Max Okumoto <okumoto@ucsd.edu>
2005-03-08 07:43:57 +00:00

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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.
*
* @(#)var.c 8.3 (Berkeley) 3/19/94
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*-
* 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 <assert.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include "buf.h"
#include "config.h"
#include "globals.h"
#include "GNode.h"
#include "make.h"
#include "nonints.h"
#include "parse.h"
#include "str.h"
#include "targ.h"
#include "util.h"
#include "var.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 */
#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 */
#define OPEN_PAREN '('
#define CLOSE_PAREN ')'
#define OPEN_BRACE '{'
#define CLOSE_BRACE '}'
static int VarPrintVar(void *, void *);
/*
* Create a Var object.
*
* Params:
* name Name of variable (copied).
* value Value of variable (copied) or NULL.
* flags Flags set on variable.
*
* Returns:
* New variable.
*/
static Var *
VarCreate(const char name[], const char value[], int flags)
{
Var *v;
v = emalloc(sizeof(Var));
v->name = estrdup(name);
v->val = Buf_Init(0);
v->flags = flags;
if (value != NULL) {
Buf_Append(v->val, value);
}
return (v);
}
/*
* Destroy a Var object.
*
* Params:
* v Object to destroy.
* f True if internal buffer in Buffer object is to be removed.
*/
static void
VarDestroy(Var *v, Boolean f)
{
Buf_Destroy(v->val, f);
free(v->name);
free(v);
}
/*-
*-----------------------------------------------------------------------
* 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(const void *v, const void *name)
{
return (strcmp(name, ((const Var *)v)->name));
}
/*-
*-----------------------------------------------------------------------
* VarPossiblyExpand --
* Expand a variable name's embedded variables in the given context.
*
* Results:
* The contents of name, possibly expanded.
*-----------------------------------------------------------------------
*/
static char *
VarPossiblyExpand(const char *name, GNode *ctxt)
{
Buffer *buf;
char *str;
char *tmp;
/*
* XXX make a temporary copy of the name because Var_Subst insists
* on writing into the string.
*/
tmp = estrdup(name);
if (strchr(name, '$') != NULL) {
buf = Var_Subst(NULL, tmp, ctxt, 0);
str = Buf_GetAll(buf, NULL);
Buf_Destroy(buf, FALSE);
free(tmp);
return (str);
} else {
return (tmp);
}
}
/*-
*-----------------------------------------------------------------------
* VarFind --
* Find the given variable in the given context and any other contexts
* indicated.
*
* Flags:
* FIND_GLOBAL set means look in the VAR_GLOBAL context too
* FIND_CMD set means to look in the VAR_CMD context too
* FIND_ENV set means to look in the environment
*
* Results:
* A pointer to the structure describing the desired variable or
* NULL if the variable does not exist.
*
* Side Effects:
* None
*-----------------------------------------------------------------------
*/
static Var *
VarFind(const char *name, GNode *ctxt, int flags)
{
Boolean localCheckEnvFirst;
LstNode *var;
char *env;
/*
* 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 == '.') {
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;
default:
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, name, (CompareProc *)strcmp) != NULL) {
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, name, VarCmp);
if (var != NULL) {
/* got it */
return (Lst_Datum(var));
}
/* not there - try command line context */
if ((flags & FIND_CMD) && (ctxt != VAR_CMD)) {
var = Lst_Find(&VAR_CMD->context, name, VarCmp);
if (var != NULL)
return (Lst_Datum(var));
}
/* not there - try global context, but only if not -e/-E */
if ((flags & FIND_GLOBAL) && (ctxt != VAR_GLOBAL) &&
!checkEnvFirst && !localCheckEnvFirst) {
var = Lst_Find(&VAR_GLOBAL->context, name, VarCmp);
if (var != NULL)
return (Lst_Datum(var));
}
if (!(flags & FIND_ENV))
/* we were not told to look into the environment */
return (NULL);
/* look in the environment */
if ((env = getenv(name)) != NULL) {
/* craft this variable from the environment value */
return (VarCreate(name, env, VAR_FROM_ENV));
}
/* deferred check for the environment (in case of -e/-E) */
if ((checkEnvFirst || localCheckEnvFirst) &&
(flags & FIND_GLOBAL) && (ctxt != VAR_GLOBAL)) {
var = Lst_Find(&VAR_GLOBAL->context, name, VarCmp);
if (var != NULL)
return (Lst_Datum(var));
}
return (NULL);
}
/*-
*-----------------------------------------------------------------------
* 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(const char *name, const char *val, GNode *ctxt)
{
Lst_AtFront(&ctxt->context, VarCreate(name, val, 0));
DEBUGF(VAR, ("%s:%s = %s\n", ctxt->name, name, val));
}
/*-
*-----------------------------------------------------------------------
* Var_Delete --
* Remove a variable from a context.
*
* Results:
* None.
*
* Side Effects:
* The Var structure is removed and freed.
*
*-----------------------------------------------------------------------
*/
void
Var_Delete(const char *name, GNode *ctxt)
{
LstNode *ln;
DEBUGF(VAR, ("%s:delete %s\n", ctxt->name, name));
ln = Lst_Find(&ctxt->context, name, VarCmp);
if (ln != NULL) {
VarDestroy(Lst_Datum(ln), TRUE);
Lst_Remove(&ctxt->context, ln);
}
}
/*-
*-----------------------------------------------------------------------
* 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(const char *name, const char *val, GNode *ctxt)
{
Var *v;
char *n;
/*
* 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...
*/
n = VarPossiblyExpand(name, ctxt);
v = VarFind(n, ctxt, 0);
if (v == NULL) {
VarAdd(n, val, ctxt);
} else {
Buf_Clear(v->val);
Buf_Append(v->val, val);
DEBUGF(VAR, ("%s:%s = %s\n", ctxt->name, n, val));
}
/*
* Any variables given on the command line are automatically exported
* to the environment (as per POSIX standard)
*/
if (ctxt == VAR_CMD) {
setenv(n, val, 1);
}
free(n);
}
/*-
*-----------------------------------------------------------------------
* 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(const char *name, const char *val, GNode *ctxt)
{
Var *v;
char *n;
n = VarPossiblyExpand(name, ctxt);
v = VarFind(n, ctxt, (ctxt == VAR_GLOBAL) ? FIND_ENV : 0);
if (v == NULL) {
VarAdd(n, val, ctxt);
} else {
Buf_AddByte(v->val, (Byte)' ');
Buf_Append(v->val, val);
DEBUGF(VAR, ("%s:%s = %s\n", ctxt->name, n,
(char *)Buf_GetAll(v->val, (size_t *)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, v);
}
}
free(n);
}
/*-
*-----------------------------------------------------------------------
* Var_Exists --
* See if the given variable exists.
*
* Results:
* TRUE if it does, FALSE if it doesn't
*
* Side Effects:
* None.
*
*-----------------------------------------------------------------------
*/
Boolean
Var_Exists(const char *name, GNode *ctxt)
{
Var *v;
char *n;
n = VarPossiblyExpand(name, ctxt);
v = VarFind(n, ctxt, FIND_CMD|FIND_GLOBAL|FIND_ENV);
free(n);
if (v == NULL) {
return (FALSE);
} else if (v->flags & VAR_FROM_ENV) {
VarDestroy(v, TRUE);
}
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(const char *name, GNode *ctxt, char **frp)
{
Var *v;
char *n;
n = VarPossiblyExpand(name, ctxt);
v = VarFind(n, ctxt, FIND_ENV | FIND_GLOBAL | FIND_CMD);
free(n);
*frp = NULL;
if (v != NULL) {
char *p = (char *)Buf_GetAll(v->val, (size_t *)NULL);
if (v->flags & VAR_FROM_ENV) {
VarDestroy(v, FALSE);
*frp = p;
}
return (p);
} else {
return (NULL);
}
}
/*-
*-----------------------------------------------------------------------
* 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:
* Uses brk_string() so it invalidates any previous call to
* brk_string().
*
*-----------------------------------------------------------------------
*/
static char *
VarModify(const char *str, VarModifyProc *modProc, void *datum)
{
char **av; /* word list [first word does not count] */
int ac;
Buffer *buf; /* Buffer for the new string */
Boolean addSpace; /* TRUE if need to add a space to the buffer
* before adding the trimmed word */
int i;
char *result;
av = brk_string(str, &ac, FALSE);
buf = Buf_Init(0);
addSpace = FALSE;
for (i = 1; i < ac; i++)
addSpace = (*modProc)(av[i], addSpace, buf, datum);
result = (char *)Buf_GetAll(buf, (size_t *)NULL);
Buf_Destroy(buf, FALSE);
return (result);
}
/*-
*-----------------------------------------------------------------------
* VarSortWords --
* Sort the words in the string.
*
* Input:
* str String whose words should be sorted
* cmp A comparison function to control the ordering
*
* Results:
* A string containing the words sorted
*
* Side Effects:
* Uses brk_string() so it invalidates any previous call to
* brk_string().
*
*-----------------------------------------------------------------------
*/
static char *
VarSortWords(const char *str, int (*cmp)(const void *, const void *))
{
char **av;
int ac;
Buffer *buf;
int i;
char *result;
av = brk_string(str, &ac, FALSE);
qsort(av + 1, ac - 1, sizeof(char *), cmp);
buf = Buf_Init(0);
for (i = 1; i < ac; i++) {
Buf_Append(buf, av[i]);
Buf_AddByte(buf, (Byte)((i < ac - 1) ? ' ' : '\0'));
}
result = (char *)Buf_GetAll(buf, (size_t *)NULL);
Buf_Destroy(buf, FALSE);
return (result);
}
static int
SortIncreasing(const void *l, const void *r)
{
return (strcmp(*(const char* const*)l, *(const char* const*)r));
}
/*-
*-----------------------------------------------------------------------
* VarGetPattern --
* Pass through the tstr 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 unless flags
* has VAR_NOSUBST set).
* Return the expanded string or NULL if the delimiter was missing
* If pattern is specified, handle escaped ampersands, and replace
* unescaped ampersands with the lhs of the pattern.
*
* Results:
* A string of all the words modified appropriately.
* If length is specified, return the string length of the buffer
* If flags is specified and the last character of the pattern is a
* $ set the VAR_MATCH_END bit of flags.
*
* Side Effects:
* None.
*-----------------------------------------------------------------------
*/
static char *
VarGetPattern(GNode *ctxt, int err, const char **tstr, int delim, int *flags,
size_t *length, VarPattern *pattern)
{
const char *cp;
Buffer *buf = Buf_Init(0);
size_t junk;
if (length == NULL)
length = &junk;
#define IS_A_MATCH(cp, delim) \
((cp[0] == '\\') && ((cp[1] == delim) || \
(cp[1] == '\\') || (cp[1] == '$') || (pattern && (cp[1] == '&'))))
/*
* Skim through until the matching delimiter is found;
* pick up variable substitutions on the way. Also allow
* backslashes to quote the delimiter, $, and \, but don't
* touch other backslashes.
*/
for (cp = *tstr; *cp && (*cp != delim); cp++) {
if (IS_A_MATCH(cp, delim)) {
Buf_AddByte(buf, (Byte)cp[1]);
cp++;
} else if (*cp == '$') {
if (cp[1] == delim) {
if (flags == NULL)
Buf_AddByte(buf, (Byte)*cp);
else
/*
* Unescaped $ at end of pattern => anchor
* pattern at end.
*/
*flags |= VAR_MATCH_END;
} else {
if (flags == NULL || (*flags & VAR_NOSUBST) == 0) {
char *cp2;
size_t len;
Boolean freeIt;
/*
* If unescaped dollar sign not before the
* delimiter, assume it's a variable
* substitution and recurse.
*/
len = 0;
cp2 = Var_Parse(cp, ctxt, err, &len, &freeIt);
Buf_Append(buf, cp2);
if (freeIt)
free(cp2);
cp += len - 1;
} else {
const char *cp2 = &cp[1];
if (*cp2 == OPEN_PAREN || *cp2 == OPEN_BRACE) {
/*
* Find the end of this variable reference
* and suck it in without further ado.
* It will be interperated later.
*/
int have = *cp2;
int want = (*cp2 == OPEN_PAREN) ? CLOSE_PAREN : CLOSE_BRACE;
int depth = 1;
for (++cp2; *cp2 != '\0' && depth > 0; ++cp2) {
if (cp2[-1] != '\\') {
if (*cp2 == have)
++depth;
if (*cp2 == want)
--depth;
}
}
Buf_AppendRange(buf, cp, cp2);
cp = --cp2;
} else
Buf_AddByte(buf, (Byte)*cp);
}
}
}
else if (pattern && *cp == '&')
Buf_AddBytes(buf, pattern->leftLen, (Byte *)pattern->lhs);
else
Buf_AddByte(buf, (Byte)*cp);
}
Buf_AddByte(buf, (Byte)'\0');
if (*cp != delim) {
*tstr = cp;
*length = 0;
return (NULL);
} else {
char *result;
*tstr = ++cp;
result = (char *)Buf_GetAll(buf, length);
*length -= 1; /* Don't count the NULL */
Buf_Destroy(buf, FALSE);
return (result);
}
}
/*-
*-----------------------------------------------------------------------
* Var_Quote --
* Quote shell meta-characters in the string
*
* Results:
* The quoted string
*
* Side Effects:
* None.
*
*-----------------------------------------------------------------------
*/
char *
Var_Quote(const char *str)
{
Buffer *buf;
/* This should cover most shells :-( */
static char meta[] = "\n \t'`\";&<>()|*?{}[]\\$!#^~";
char *ret;
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');
ret = Buf_GetAll(buf, NULL);
Buf_Destroy(buf, FALSE);
return (ret);
}
/*-
*-----------------------------------------------------------------------
* VarREError --
* Print the error caused by a regcomp or regexec call.
*
* Results:
* None.
*
* Side Effects:
* An error gets printed.
*
*-----------------------------------------------------------------------
*/
void
VarREError(int err, regex_t *pat, const char *str)
{
char *errbuf;
int errlen;
errlen = regerror(err, pat, 0, 0);
errbuf = emalloc(errlen);
regerror(err, pat, errbuf, errlen);
Error("%s: %s", str, errbuf);
free(errbuf);
}
/*
* Make sure this variable is fully expanded.
*/
static char *
VarExpand(Var *v, GNode *ctxt, Boolean err)
{
char *value;
char *result;
if (v->flags & VAR_IN_USE) {
Fatal("Variable %s is recursive.", v->name);
/* NOTREACHED */
}
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.
*/
value = (char *)Buf_GetAll(v->val, (size_t *)NULL);
if (strchr(value, '$') == NULL) {
result = strdup(value);
} else {
Buffer *buf;
buf = Var_Subst(NULL, value, ctxt, err);
result = Buf_GetAll(buf, NULL);
Buf_Destroy(buf, FALSE);
}
v->flags &= ~VAR_IN_USE;
return (result);
}
/**
* Select only those words that match the modifier.
*/
static char *
modifier_M(const char mod[], const char value[], char endc, size_t *consumed)
{
const char *cur;
const char *end;
char *patt;
char *ptr;
char *newValue;
for (cur = mod + 1; *cur != '\0'; cur++) {
if (cur[0] == endc) {
break;
} else if (cur[0] == ':') {
break;
} else if ((cur[0] == '\\') &&
(cur[1] == ':' || cur[1] == endc)) {
cur++;
}
}
end = cur;
/*
* Compress the \:'s out of the pattern, so allocate enough
* room to hold the uncompressed pattern and compress the
* pattern into the space. (note that cur started at mod+1
* so cur-mod takes the null byte into account)
*/
patt = emalloc(cur - mod);
ptr = patt;
for (cur = mod + 1; cur != end; cur++) {
if ((cur[0] == '\\') &&
(cur[1] == ':' || cur[1] == endc)) {
cur++;
}
*ptr = *cur;
ptr++;
}
*ptr = '\0';
if (*mod == 'M' || *mod == 'm') {
newValue = VarModify(value, VarMatch, patt);
} else {
newValue = VarModify(value, VarNoMatch, patt);
}
free(patt);
*consumed += (end - mod);
if (*end == ':') {
*consumed += 1; /* include colon as part of modifier */
}
return (newValue);
}
static char *
modifier_S(const char mod[], const char value[], Var *v, GNode *ctxt, Boolean err, size_t *consumed)
{
VarPattern pattern;
Buffer *buf; /* Buffer for patterns */
char delim;
const char *cur;
char *newValue;
pattern.flags = 0;
buf = Buf_Init(0);
delim = mod[1]; /* used to find end of pattern */
/*
* If pattern begins with '^', it is anchored to the start of the
* word -- skip over it and flag pattern.
*/
if (mod[2] == '^') {
pattern.flags |= VAR_MATCH_START;
cur = mod + 3;
} else {
cur = mod + 2;
}
/*
* Pass through the lhs looking for 1) escaped delimiters, '$'s and
* backslashes (place the escaped character in uninterpreted) and 2)
* unescaped $'s that aren't before the delimiter (expand the
* variable substitution). The result is left in the Buffer buf.
*/
while (cur[0] != delim) {
if (cur[0] == '\0') {
/*
* LHS didn't end with the delim, complain and exit.
*/
Fatal("Unclosed substitution for %s (%c missing)",
v->name, delim);
} else if ((cur[0] == '\\') &&
((cur[1] == delim) ||
(cur[1] == '$') ||
(cur[1] == '\\'))) {
cur++; /* skip backslash */
Buf_AddByte(buf, (Byte) cur[0]);
cur++;
} else if (cur[0] == '$') {
if (cur[1] == delim) {
/*
* Unescaped $ at end of pattern => anchor
* pattern at end.
*/
pattern.flags |= VAR_MATCH_END;
cur++;
} else {
/*
* If unescaped dollar sign not before the
* delimiter, assume it's a variable
* substitution and recurse.
*/
char *cp2;
size_t len;
Boolean freeIt;
len = 0;
cp2 = Var_Parse(cur, ctxt, err, &len, &freeIt);
cur += len;
Buf_Append(buf, cp2);
if (freeIt) {
free(cp2);
}
}
} else {
Buf_AddByte(buf, (Byte)cur[0]);
cur++;
}
}
cur++; /* skip over delim */
/*
* Fetch pattern and destroy buffer, but preserve the data in it,
* since that's our lhs.
*/
pattern.lhs = (char *)Buf_GetAll(buf, &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);
while (cur[0] != delim) {
if (cur[0] == '\0') {
/*
* Didn't end with delim character, complain
*/
Fatal("Unclosed substitution for %s (%c missing)",
v->name, delim);
} else if ((cur[0] == '\\') &&
((cur[1] == delim) ||
(cur[1] == '&') ||
(cur[1] == '\\') ||
(cur[1] == '$'))) {
cur++; /* skip backslash */
Buf_AddByte(buf, (Byte) cur[0]);
cur++;
} else if (cur[0] == '$') {
if (cur[1] == delim) {
Buf_AddByte(buf, (Byte) cur[0]);
cur++;
} else {
char *cp2;
size_t len;
Boolean freeIt;
len = 0;
cp2 = Var_Parse(cur, ctxt, err, &len, &freeIt);
cur += len;
Buf_Append(buf, cp2);
if (freeIt) {
free(cp2);
}
}
} else if (cur[0] == '&') {
Buf_AddBytes(buf, pattern.leftLen, (Byte *)pattern.lhs);
cur++;
} else {
Buf_AddByte(buf, (Byte) cur[0]);
cur++;
}
}
cur++; /* skip over delim */
pattern.rhs = (char *)Buf_GetAll(buf, &pattern.rightLen);
Buf_Destroy(buf, FALSE);
/*
* Check for global substitution. If 'g' after the final delimiter,
* substitution is global and is marked that way.
*/
if (cur[0] == 'g') {
pattern.flags |= VAR_SUB_GLOBAL;
cur++;
}
/*
* Global substitution of the empty string causes an infinite number
* of matches, unless anchored by '^' (start of string) or '$' (end
* of string). Catch the infinite substitution here. Note that flags
* can only contain the 3 bits we're interested in so we don't have
* to mask unrelated bits. We can test for equality.
*/
if (!pattern.leftLen && pattern.flags == VAR_SUB_GLOBAL)
Fatal("Global substitution of the empty string");
newValue = VarModify(value, VarSubstitute, &pattern);
/*
* Free the two strings.
*/
free(pattern.lhs);
free(pattern.rhs);
*consumed += (cur - mod);
if (cur[0] == ':') {
*consumed += 1; /* include colin as part of modifier */
}
return (newValue);
}
/*
* 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
* :C<d><pat1><d><pat2><d>[g]
* Substitute <pat2> for regex <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.
* :U Converts variable to upper-case.
* :L Converts variable to lower-case.
*
* XXXHB update this comment or remove it and point to the man page.
*/
static char *
ParseModifier(const char input[], const char tstr[],
char startc, char endc, Boolean dynamic, Var *v,
GNode *ctxt, Boolean err, size_t *lengthPtr, Boolean *freePtr)
{
char *rw_str;
const char *cp;
rw_str = VarExpand(v, ctxt, err);
*freePtr = TRUE;
tstr++;
while (*tstr != endc) {
char *newStr; /* New value to return */
char termc; /* Character which terminated scan */
Boolean readonly = FALSE;
size_t consumed = 0;
DEBUGF(VAR, ("Applying :%c to \"%s\"\n", *tstr, rw_str));
switch (*tstr) {
case 'N':
case 'M':
readonly = TRUE; /* tstr isn't modified here */
newStr = modifier_M(tstr, rw_str, endc, &consumed);
tstr += consumed;
break;
case 'S':
readonly = TRUE; /* tstr isn't modified here */
newStr = modifier_S(tstr, rw_str, v, ctxt, err, &consumed);
tstr += consumed;
break;
case 'C':
{
int delim;
VarREPattern pattern;
char *re;
int error;
pattern.flags = 0;
delim = tstr[1];
tstr += 2;
cp = tstr;
if ((re = VarGetPattern(ctxt, err, &cp, delim, NULL,
NULL, NULL)) == NULL) {
/* was: goto cleanup */
*lengthPtr = cp - input + 1;
if (*freePtr)
free(rw_str);
if (delim != '\0')
Fatal("Unclosed substitution for %s (%c missing)",
v->name, delim);
return (var_Error);
}
if ((pattern.replace = VarGetPattern(ctxt, err, &cp,
delim, NULL, NULL, NULL)) == NULL){
free(re);
/* was: goto cleanup */
*lengthPtr = cp - input + 1;
if (*freePtr)
free(rw_str);
if (delim != '\0')
Fatal("Unclosed substitution for %s (%c missing)",
v->name, delim);
return (var_Error);
}
for (;; cp++) {
switch (*cp) {
case 'g':
pattern.flags |= VAR_SUB_GLOBAL;
continue;
case '1':
pattern.flags |= VAR_SUB_ONE;
continue;
default:
break;
}
break;
}
termc = *cp;
error = regcomp(&pattern.re, re, REG_EXTENDED);
free(re);
if (error) {
*lengthPtr = cp - input + 1;
VarREError(error, &pattern.re, "RE substitution error");
free(pattern.replace);
return (var_Error);
}
pattern.nsub = pattern.re.re_nsub + 1;
if (pattern.nsub < 1)
pattern.nsub = 1;
if (pattern.nsub > 10)
pattern.nsub = 10;
pattern.matches = emalloc(pattern.nsub *
sizeof(regmatch_t));
newStr = VarModify(rw_str, VarRESubstitute, &pattern);
regfree(&pattern.re);
free(pattern.replace);
free(pattern.matches);
break;
}
case 'L':
if (tstr[1] == endc || tstr[1] == ':') {
Buffer *buf;
buf = Buf_Init(MAKE_BSIZE);
for (cp = rw_str; *cp ; cp++)
Buf_AddByte(buf, (Byte)tolower(*cp));
Buf_AddByte(buf, (Byte)'\0');
newStr = (char *)Buf_GetAll(buf, (size_t *)NULL);
Buf_Destroy(buf, FALSE);
cp = tstr + 1;
termc = *cp;
break;
}
/* FALLTHROUGH */
case 'O':
if (tstr[1] == endc || tstr[1] == ':') {
newStr = VarSortWords(rw_str, SortIncreasing);
cp = tstr + 1;
termc = *cp;
break;
}
/* FALLTHROUGH */
case 'Q':
if (tstr[1] == endc || tstr[1] == ':') {
newStr = Var_Quote(rw_str);
cp = tstr + 1;
termc = *cp;
break;
}
/*FALLTHRU*/
case 'T':
if (tstr[1] == endc || tstr[1] == ':') {
newStr = VarModify(rw_str, VarTail, (void *)NULL);
cp = tstr + 1;
termc = *cp;
break;
}
/*FALLTHRU*/
case 'U':
if (tstr[1] == endc || tstr[1] == ':') {
Buffer *buf;
buf = Buf_Init(MAKE_BSIZE);
for (cp = rw_str; *cp ; cp++)
Buf_AddByte(buf, (Byte)toupper(*cp));
Buf_AddByte(buf, (Byte)'\0');
newStr = (char *)Buf_GetAll(buf, (size_t *)NULL);
Buf_Destroy(buf, FALSE);
cp = tstr + 1;
termc = *cp;
break;
}
/* FALLTHROUGH */
case 'H':
if (tstr[1] == endc || tstr[1] == ':') {
newStr = VarModify(rw_str, VarHead, (void *)NULL);
cp = tstr + 1;
termc = *cp;
break;
}
/*FALLTHRU*/
case 'E':
if (tstr[1] == endc || tstr[1] == ':') {
newStr = VarModify(rw_str, VarSuffix, (void *)NULL);
cp = tstr + 1;
termc = *cp;
break;
}
/*FALLTHRU*/
case 'R':
if (tstr[1] == endc || tstr[1] == ':') {
newStr = VarModify(rw_str, VarRoot, (void *)NULL);
cp = tstr + 1;
termc = *cp;
break;
}
/*FALLTHRU*/
#ifdef SUNSHCMD
case 's':
if (tstr[1] == 'h' && (tstr[2] == endc || tstr[2] == ':')) {
const char *error;
Buffer *buf;
buf = Cmd_Exec(rw_str, &error);
newStr = Buf_GetAll(buf, NULL);
Buf_Destroy(buf, FALSE);
if (error)
Error(error, rw_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;
int cnt;
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) {
int delim;
/*
* Now we break this sucker into the lhs and
* rhs. We must null terminate them of course.
*/
cp = tstr;
delim = '=';
if ((pattern.lhs = VarGetPattern(ctxt,
err, &cp, delim, &pattern.flags, &pattern.leftLen,
NULL)) == NULL) {
/* was: goto cleanup */
*lengthPtr = cp - input + 1;
if (*freePtr)
free(rw_str);
if (delim != '\0')
Fatal("Unclosed substitution for %s (%c missing)",
v->name, delim);
return (var_Error);
}
delim = endc;
if ((pattern.rhs = VarGetPattern(ctxt,
err, &cp, delim, NULL, &pattern.rightLen,
&pattern)) == NULL) {
/* was: goto cleanup */
*lengthPtr = cp - input + 1;
if (*freePtr)
free(rw_str);
if (delim != '\0')
Fatal("Unclosed substitution for %s (%c missing)",
v->name, delim);
return (var_Error);
}
/*
* SYSV modifications happen through the whole
* string. Note the pattern is anchored at the end.
*/
termc = *--cp;
delim = '\0';
newStr = VarModify(rw_str, VarSYSVMatch, &pattern);
free(pattern.lhs);
free(pattern.rhs);
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;
}
}
}
DEBUGF(VAR, ("Result is \"%s\"\n", newStr));
if (*freePtr) {
free(rw_str);
}
rw_str = newStr;
if (rw_str != var_Error) {
*freePtr = TRUE;
} else {
*freePtr = FALSE;
}
if (readonly == FALSE) {
if (termc == '\0') {
Error("Unclosed variable specification for %s",
v->name);
} else if (termc == ':') {
cp++;
} else {
}
tstr = cp;
}
}
if (v->flags & VAR_FROM_ENV) {
if (rw_str == (char *)Buf_GetAll(v->val, (size_t *)NULL)) {
/*
* Returning the value unmodified, so tell the caller to free
* the thing.
*/
*freePtr = TRUE;
*lengthPtr = tstr - input + 1;
VarDestroy(v, FALSE);
return (rw_str);
} else {
*lengthPtr = tstr - input + 1;
VarDestroy(v, TRUE);
return (rw_str);
}
} 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(rw_str);
}
if (dynamic) {
*freePtr = FALSE;
*lengthPtr = tstr - input + 1;
VarDestroy(v, TRUE);
rw_str = emalloc(*lengthPtr + 1);
strncpy(rw_str, input, *lengthPtr);
rw_str[*lengthPtr] = '\0';
*freePtr = TRUE;
return (rw_str);
} else {
*freePtr = FALSE;
*lengthPtr = tstr - input + 1;
VarDestroy(v, TRUE);
return (err ? var_Error : varNoError);
}
} else {
*lengthPtr = tstr - input + 1;
return (rw_str);
}
}
/*
* Check if brackets contain a variable name.
*/
static char *
VarParseLong(const char input[], GNode *ctxt, Boolean err, size_t *lengthPtr,
Boolean *freePtr)
{
Buffer *buf;
char endc; /* Ending character when variable in parens
* or braces */
char startc; /* Starting character when variable in parens
* or braces */
const char *ptr;
const char *vname;
size_t vlen; /* length of variable name, after embedded
* variable expansion */
buf = Buf_Init(MAKE_BSIZE);
/*
* Skip to the end character or a colon, whichever comes first,
* replacing embedded variables as we go.
*/
startc = input[0];
endc = (startc == OPEN_PAREN) ? CLOSE_PAREN : CLOSE_BRACE;
ptr = input + 1;
while (*ptr != endc && *ptr != ':') {
if (*ptr == '\0') {
/*
* If we did not find the end character,
* return var_Error right now, setting the
* length to be the distance to the end of
* the string, since that's what make does.
*/
*freePtr = FALSE;
*lengthPtr += ptr - input;
Buf_Destroy(buf, TRUE);
return (var_Error);
} else if (*ptr == '$') {
size_t rlen;
Boolean rfree;
char *rval;
rlen = 0;
rval = Var_Parse(ptr, ctxt, err, &rlen, &rfree);
if (rval == var_Error) {
Fatal("Error expanding embedded variable.");
}
Buf_Append(buf, rval);
if (rfree)
free(rval);
ptr += rlen - 1;
} else {
Buf_AddByte(buf, (Byte)*ptr);
}
ptr++;
}
vname = Buf_GetAll(buf, &vlen);
{
const char *const tstr = ptr;
size_t consumed = tstr - (input - 1) + 1;
Var *v; /* Variable in invocation */
Boolean haveModifier; /* TRUE if have modifiers for the variable */
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 */
input--;
haveModifier = (*tstr == ':');
dynamic = FALSE;
v = VarFind(vname, ctxt, FIND_ENV | FIND_GLOBAL | FIND_CMD);
if (v != NULL) {
Buf_Destroy(buf, TRUE);
if (haveModifier) {
return (ParseModifier(input, tstr,
startc, endc, dynamic, v,
ctxt, err, lengthPtr, freePtr));
} else {
char *result;
result = VarExpand(v, ctxt, err);
if (v->flags & VAR_FROM_ENV) {
VarDestroy(v, TRUE);
}
*freePtr = TRUE;
*lengthPtr = consumed;
return (result);
}
}
if ((ctxt != VAR_CMD) && (ctxt != VAR_GLOBAL)) {
/*
* Check for D and F forms of local variables since we're in
* a local context and the name is the right length.
*/
if ((vlen == 2) &&
(vname[1] == 'F' || vname[1] == 'D') &&
(strchr("!%*<>@", vname[0]) != NULL)) {
char name[2];
char *val;
/*
* Well, it's local -- go look for it.
*/
name[0] = vname[0];
name[1] = '\0';
v = VarFind(name, ctxt, 0);
if (v != NULL) {
if (haveModifier) {
Buf_Destroy(buf, TRUE);
return (ParseModifier(input, tstr,
startc, endc, dynamic, v,
ctxt, err, lengthPtr, freePtr));
} else {
/*
* 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, (size_t *) NULL);
if (vname[1] == 'D') {
val = VarModify(val, VarHead, (void *)NULL);
} else {
val = VarModify(val, VarTail, (void *)NULL);
}
/*
* Resulting string is dynamically
* allocated, so tell caller to free
* it.
*/
*freePtr = TRUE;
*lengthPtr = consumed;
Buf_Destroy(buf, TRUE);
return (val);
}
}
}
} else {
if (((vlen == 1)) ||
((vlen == 2) && (vname[1] == 'F' || vname[1] == 'D'))) {
/*
* 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.
*/
if (strchr("!%*@", vname[0]) != NULL) {
dynamic = TRUE;
}
}
if ((vlen > 2) &&
(vname[0] == '.') &&
isupper((unsigned char)vname[1])) {
if ((strncmp(vname, ".TARGET", vlen - 1) == 0) ||
(strncmp(vname, ".ARCHIVE", vlen - 1) == 0) ||
(strncmp(vname, ".PREFIX", vlen - 1) == 0) ||
(strncmp(vname, ".MEMBER", vlen - 1) == 0)) {
dynamic = TRUE;
}
}
}
if (haveModifier) {
/*
* Still need to get to the end of the variable
* specification, so kludge up a Var structure for
* the modifications
*/
v = VarCreate(vname, NULL, VAR_JUNK);
Buf_Destroy(buf, TRUE);
return (ParseModifier(input, tstr,
startc, endc, dynamic, v,
ctxt, err, lengthPtr, freePtr));
} else {
/*
* No modifiers -- have specification length so we
* can return now.
*/
if (dynamic) {
char *result;
result = emalloc(consumed + 1);
strncpy(result, input, consumed);
result[consumed] = '\0';
*freePtr = TRUE;
*lengthPtr = consumed;
Buf_Destroy(buf, TRUE);
return (result);
} else {
*freePtr = FALSE;
*lengthPtr = consumed;
Buf_Destroy(buf, TRUE);
return (err ? var_Error : varNoError);
}
}
}
}
/**
* 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.
*/
static char *
VarParseShort(const char input[], GNode *ctxt, Boolean err,
size_t *lengthPtr, Boolean *freePtr)
{
char name[2];
Var *v;
name[0] = input[0];
name[1] = '\0';
/* consume character */
*lengthPtr += 1;
v = VarFind(name, ctxt, FIND_ENV | FIND_GLOBAL | FIND_CMD);
if (v != NULL) {
char *result;
result = VarExpand(v, ctxt, err);
if (v->flags & VAR_FROM_ENV) {
VarDestroy(v, TRUE);
}
*freePtr = TRUE;
return (result);
}
/*
* 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.
*/
if ((ctxt == VAR_CMD) || (ctxt == VAR_GLOBAL)) {
/* XXX: It looks like $% and $! are reversed here */
switch (name[0]) {
case '@':
*freePtr = TRUE;
return (estrdup("$(.TARGET)"));
case '%':
*freePtr = TRUE;
return (estrdup("$(.ARCHIVE)"));
case '*':
*freePtr = TRUE;
return (estrdup("$(.PREFIX)"));
case '!':
*freePtr = TRUE;
return (estrdup("$(.MEMBER)"));
default:
*freePtr = FALSE;
return (err ? var_Error : varNoError);
}
}
*freePtr = FALSE;
return (err ? var_Error : varNoError);
}
/*-
*-----------------------------------------------------------------------
* Var_Parse --
* Given the start of a variable invocation, extract the variable
* name and find its value, then modify it according to the
* specification.
*
* Results:
* The value of the variable or var_Error if the specification
* is invalid. The length of the specification is placed in
* *lengthPtr (for invalid specifications, this is just 2 to
* skip the '$' and the following letter, or 1 if '$' was the
* last character in the string). A Boolean in *freePtr telling
* whether the returned string should be freed by the caller.
*
* Side Effects:
* None.
*
* Assumption:
* It is assumed that Var_Parse() is called with input[0] == '$'.
*
*-----------------------------------------------------------------------
*/
char *
Var_Parse(const char input[], GNode *ctxt, Boolean err,
size_t *lengthPtr, Boolean *freePtr)
{
/* assert(input[0] == '$'); */
/* consume '$' */
input += 1;
*lengthPtr += 1;
if (input[0] == '\0') {
/* Error, there is only a dollar sign in the input string. */
*freePtr = FALSE;
return (err ? var_Error : varNoError);
} else if (input[0] == OPEN_PAREN || input[0] == OPEN_BRACE) {
/* multi letter variable name */
return (VarParseLong(input, ctxt, err, lengthPtr, freePtr));
} else {
/* single letter variable name */
return (VarParseShort(input, ctxt, err, lengthPtr, freePtr));
}
}
/*-
*-----------------------------------------------------------------------
* 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
*-----------------------------------------------------------------------
*/
Buffer *
Var_Subst(const char *var, const char *str, GNode *ctxt, Boolean undefErr)
{
Boolean errorReported;
Buffer *buf; /* Buffer for forming things */
/*
* Set TRUE if an error has already been reported to prevent a
* plethora of messages when recursing.
* XXXHB this comment sounds wrong.
*/
errorReported = FALSE;
buf = Buf_Init(0);
while (*str) {
if (var == NULL && (str[0] == '$') && (str[1] == '$')) {
/*
* 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.
*/
Buf_AddByte(buf, (Byte)str[0]);
str += 2;
} else if (str[0] == '$') {
char *val; /* Value to substitute for a variable */
size_t length; /* Length of the variable invocation */
Boolean doFree; /* Set true if val should be freed */
/*
* Variable invocation.
*/
if (var != NULL) {
int expand;
for (;;) {
if (str[1] == OPEN_PAREN || str[1] == OPEN_BRACE) {
size_t ln;
const char *p = str + 2;
/*
* Scan up to the end of the variable name.
*/
while (*p != '\0' &&
*p != ':' &&
*p != CLOSE_PAREN &&
*p != CLOSE_BRACE &&
*p != '$') {
++p;
}
/*
* A variable inside the variable. We cannot expand
* the external variable yet, so we try again with
* the nested one
*/
if (*p == '$') {
Buf_AppendRange(buf, str, p);
str = p;
continue;
}
ln = p - (str + 2);
if (var[ln] == '\0' && strncmp(var, str + 2, ln) == 0) {
expand = TRUE;
} else {
/*
* Not the variable we want to expand, scan
* until the next variable
*/
while (*p != '$' && *p != '\0')
p++;
Buf_AppendRange(buf, str, p);
str = p;
expand = FALSE;
}
} else {
/*
* Single letter variable name
*/
if (var[1] == '\0' && var[0] == str[1]) {
expand = TRUE;
} else {
Buf_AddBytes(buf, 2, (const Byte *)str);
str += 2;
expand = FALSE;
}
}
break;
}
if (!expand)
continue;
}
length = 0;
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_Append(buf, val);
if (doFree) {
free(val);
}
}
} else {
/*
* Skip as many characters as possible -- either to the end of
* the string or to the next dollar sign (variable invocation).
*/
const char *cp = str;
do {
str++;
} while (str[0] != '$' && str[0] != '\0');
Buf_AppendRange(buf, cp, str);
}
}
return (buf);
}
/*-
*-----------------------------------------------------------------------
* 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(char *file)
{
return (VarModify(file, VarTail, (void *)NULL));
}
/*-
*-----------------------------------------------------------------------
* 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(char *file)
{
return (VarModify(file, VarHead, (void *)NULL));
}
/*-
*-----------------------------------------------------------------------
* Var_Init --
* Initialize the module
*
* Results:
* None
*
* Side Effects:
* The VAR_CMD and VAR_GLOBAL contexts are created
*-----------------------------------------------------------------------
*/
void
Var_Init(void)
{
VAR_GLOBAL = Targ_NewGN("Global");
VAR_CMD = Targ_NewGN("Command");
}
/****************** PRINT DEBUGGING INFO *****************/
static int
VarPrintVar(void *vp, void *dummy __unused)
{
Var *v = (Var *) vp;
printf("%-16s = %s\n", v->name, (char *)Buf_GetAll(v->val, (size_t *)NULL));
return (0);
}
/*-
*-----------------------------------------------------------------------
* Var_Dump --
* print all variables in a context
*-----------------------------------------------------------------------
*/
void
Var_Dump(GNode *ctxt)
{
Lst_ForEach(&ctxt->context, VarPrintVar, (void *)NULL);
}
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