2 * Copyright (c) 1988, 1989, 1990, 1993
3 * The Regents of the University of California. All rights reserved.
4 * Copyright (c) 1989 by Berkeley Softworks
7 * This code is derived from software contributed to Berkeley by
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11 * modification, are permitted provided that the following conditions
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14 * notice, this list of conditions and the following disclaimer.
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20 * This product includes software developed by the University of
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22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
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28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * @(#)var.c 8.3 (Berkeley) 3/19/94
39 * $FreeBSD: src/usr.bin/make/var.c,v 1.16.2.3 2002/02/27 14:18:57 cjc Exp $
40 * $DragonFly: src/usr.bin/make/var.c,v 1.31 2005/01/06 10:53:00 okumoto Exp $
45 * Variable-handling functions
48 * Var_Set Set the value of a variable in the given
49 * context. The variable is created if it doesn't
50 * yet exist. The value and variable name need not
53 * Var_Append Append more characters to an existing variable
54 * in the given context. The variable needn't
55 * exist already -- it will be created if it doesn't.
56 * A space is placed between the old value and the
59 * Var_Exists See if a variable exists.
61 * Var_Value Return the value of a variable in a context or
62 * NULL if the variable is undefined.
64 * Var_Subst Substitute named variable, or all variables if
65 * NULL in a string using
66 * the given context as the top-most one. If the
67 * third argument is non-zero, Parse_Error is
68 * called if any variables are undefined.
70 * Var_Parse Parse a variable expansion from a string and
71 * return the result and the number of characters
74 * Var_Delete Delete a variable in a context.
76 * Var_Init Initialize this module.
79 * Var_Dump Print out all variables defined in the given
82 * XXX: There's a lot of duplication in these functions.
101 * This is a harmless return value for Var_Parse that can be used by Var_Subst
102 * to determine if there was an error in parsing -- easier than returning
103 * a flag, as things outside this module don't give a hoot.
105 char var_Error[] = "";
108 * Similar to var_Error, but returned when the 'err' flag for Var_Parse is
109 * set false. Why not just use a constant? Well, gcc likes to condense
110 * identical string instances...
112 static char varNoError[] = "";
115 * Internally, variables are contained in four different contexts.
116 * 1) the environment. They may not be changed. If an environment
117 * variable is appended-to, the result is placed in the global
119 * 2) the global context. Variables set in the Makefile are located in
120 * the global context. It is the penultimate context searched when
122 * 3) the command-line context. All variables set on the command line
123 * are placed in this context. They are UNALTERABLE once placed here.
124 * 4) the local context. Each target has associated with it a context
125 * list. On this list are located the structures describing such
126 * local variables as $(@) and $(*)
127 * The four contexts are searched in the reverse order from which they are
130 GNode *VAR_GLOBAL; /* variables from the makefile */
131 GNode *VAR_CMD; /* variables defined on the command-line */
133 #define FIND_CMD 0x1 /* look in VAR_CMD when searching */
134 #define FIND_GLOBAL 0x2 /* look in VAR_GLOBAL as well */
135 #define FIND_ENV 0x4 /* look in the environment also */
137 static void VarPossiblyExpand(char **, GNode *);
138 static Var *VarFind(char *, GNode *, int);
139 static void VarAdd(char *, char *, GNode *);
140 static void VarDelete(void *);
141 static char *VarGetPattern(GNode *, int, char **, int, int *, size_t *,
143 static char *VarModify(char *,
144 Boolean (*)(const char *, Boolean, Buffer, void *),
146 static int VarPrintVar(void *, void *);
149 *-----------------------------------------------------------------------
151 * See if the given variable matches the named one. Called from
152 * Lst_Find when searching for a variable of a given name.
155 * 0 if they match. non-zero otherwise.
159 *-----------------------------------------------------------------------
162 VarCmp(const void *v, const void *name)
165 return (strcmp(name, ((const Var *)v)->name));
169 *-----------------------------------------------------------------------
170 * VarPossiblyExpand --
171 * Expand a variable name's embedded variables in the given context.
174 * The contents of name, possibly expanded.
177 * The caller must free the new contents or old contents of name.
178 *-----------------------------------------------------------------------
181 VarPossiblyExpand(char **name, GNode *ctxt)
184 if (strchr(*name, '$') != NULL)
185 *name = Var_Subst(NULL, *name, ctxt, 0);
187 *name = estrdup(*name);
191 *-----------------------------------------------------------------------
193 * Find the given variable in the given context and any other contexts
197 * FIND_GLOBAL set means look in the VAR_GLOBAL context too
198 * FIND_CMD set means to look in the VAR_CMD context too
199 * FIND_ENV set means to look in the environment
202 * A pointer to the structure describing the desired variable or
203 * NULL if the variable does not exist.
207 *-----------------------------------------------------------------------
210 VarFind(char *name, GNode *ctxt, int flags)
212 Boolean localCheckEnvFirst;
217 * If the variable name begins with a '.', it could very well be one of
218 * the local ones. We check the name against all the local variables
219 * and substitute the short version in for 'name' if it matches one of
222 if (*name == '.' && isupper((unsigned char)name[1]))
225 if (!strcmp(name, ".ALLSRC"))
227 if (!strcmp(name, ".ARCHIVE"))
231 if (!strcmp(name, ".IMPSRC"))
235 if (!strcmp(name, ".MEMBER"))
239 if (!strcmp(name, ".OODATE"))
243 if (!strcmp(name, ".PREFIX"))
247 if (!strcmp(name, ".TARGET"))
253 * Note whether this is one of the specific variables we were told through
254 * the -E flag to use environment-variable-override for.
256 if (Lst_Find(&envFirstVars, name, (CompareProc *)strcmp) != NULL) {
257 localCheckEnvFirst = TRUE;
259 localCheckEnvFirst = FALSE;
263 * First look for the variable in the given context. If it's not there,
264 * look for it in VAR_CMD, VAR_GLOBAL and the environment, in that order,
265 * depending on the FIND_* flags in 'flags'
267 var = Lst_Find(&ctxt->context, name, VarCmp);
269 if ((var == NULL) && (flags & FIND_CMD) && (ctxt != VAR_CMD)) {
270 var = Lst_Find(&VAR_CMD->context, name, VarCmp);
272 if ((var == NULL) && (flags & FIND_GLOBAL) && (ctxt != VAR_GLOBAL) &&
273 !checkEnvFirst && !localCheckEnvFirst)
275 var = Lst_Find(&VAR_GLOBAL->context, name, VarCmp);
277 if ((var == NULL) && (flags & FIND_ENV)) {
280 if ((env = getenv(name)) != NULL) {
283 v = emalloc(sizeof(Var));
284 v->name = estrdup(name);
288 v->val = Buf_Init(len);
289 Buf_AddBytes(v->val, len, (Byte *)env);
291 v->flags = VAR_FROM_ENV;
293 } else if ((checkEnvFirst || localCheckEnvFirst) &&
294 (flags & FIND_GLOBAL) && (ctxt != VAR_GLOBAL))
296 var = Lst_Find(&VAR_GLOBAL->context, name, VarCmp);
300 return (Lst_Datum(var));
305 } else if (var == NULL) {
308 return (Lst_Datum(var));
313 *-----------------------------------------------------------------------
315 * Add a new variable of name name and value val to the given context.
321 * The new variable is placed at the front of the given context
322 * The name and val arguments are duplicated so they may
324 *-----------------------------------------------------------------------
327 VarAdd(char *name, char *val, GNode *ctxt)
332 v = emalloc(sizeof(Var));
334 v->name = estrdup(name);
336 len = val ? strlen(val) : 0;
337 v->val = Buf_Init(len+1);
338 Buf_AddBytes(v->val, len, (Byte *)val);
342 Lst_AtFront(&ctxt->context, v);
343 DEBUGF(VAR, ("%s:%s = %s\n", ctxt->name, name, val));
347 *-----------------------------------------------------------------------
349 * Delete a variable and all the space associated with it.
356 *-----------------------------------------------------------------------
364 Buf_Destroy(v->val, TRUE);
369 *-----------------------------------------------------------------------
371 * Remove a variable from a context.
377 * The Var structure is removed and freed.
379 *-----------------------------------------------------------------------
382 Var_Delete(char *name, GNode *ctxt)
386 DEBUGF(VAR, ("%s:delete %s\n", ctxt->name, name));
387 ln = Lst_Find(&ctxt->context, name, VarCmp);
389 VarDelete(Lst_Datum(ln));
390 Lst_Remove(&ctxt->context, ln);
395 *-----------------------------------------------------------------------
397 * Set the variable name to the value val in the given context.
403 * If the variable doesn't yet exist, a new record is created for it.
404 * Else the old value is freed and the new one stuck in its place
407 * The variable is searched for only in its context before being
408 * created in that context. I.e. if the context is VAR_GLOBAL,
409 * only VAR_GLOBAL->context is searched. Likewise if it is VAR_CMD, only
410 * VAR_CMD->context is searched. This is done to avoid the literally
411 * thousands of unnecessary strcmp's that used to be done to
412 * set, say, $(@) or $(<).
413 *-----------------------------------------------------------------------
416 Var_Set(char *name, char *val, GNode *ctxt)
421 * We only look for a variable in the given context since anything set
422 * here will override anything in a lower context, so there's not much
423 * point in searching them all just to save a bit of memory...
425 VarPossiblyExpand(&name, ctxt);
426 v = VarFind(name, ctxt, 0);
428 VarAdd(name, val, ctxt);
430 Buf_Discard(v->val, Buf_Size(v->val));
431 Buf_AddBytes(v->val, strlen(val), (Byte *)val);
433 DEBUGF(VAR, ("%s:%s = %s\n", ctxt->name, name, val));
436 * Any variables given on the command line are automatically exported
437 * to the environment (as per POSIX standard)
439 if (ctxt == VAR_CMD || (v != (Var *)NULL && (v->flags & VAR_TO_ENV))) {
440 setenv(name, val, 1);
447 * Set the VAR_TO_ENV flag on a variable
450 Var_SetEnv (char *name, GNode *ctxt)
454 v = VarFind(name, ctxt, FIND_CMD|FIND_GLOBAL|FIND_ENV);
456 if ((v->flags & VAR_TO_ENV) == 0) {
457 v->flags |= VAR_TO_ENV;
458 setenv(v->name, Buf_GetAll(v->val, NULL), 1);
461 Error("Cannot set environment flag on non-existant variable %s", name);
466 *-----------------------------------------------------------------------
468 * The variable of the given name has the given value appended to it in
475 * If the variable doesn't exist, it is created. Else the strings
476 * are concatenated (with a space in between).
479 * Only if the variable is being sought in the global context is the
480 * environment searched.
481 * XXX: Knows its calling circumstances in that if called with ctxt
482 * an actual target, it will only search that context since only
483 * a local variable could be being appended to. This is actually
484 * a big win and must be tolerated.
485 *-----------------------------------------------------------------------
488 Var_Append(char *name, char *val, GNode *ctxt)
492 VarPossiblyExpand(&name, ctxt);
493 v = VarFind(name, ctxt, (ctxt == VAR_GLOBAL) ? FIND_ENV : 0);
496 VarAdd(name, val, ctxt);
498 Buf_AddByte(v->val, (Byte)' ');
499 Buf_AddBytes(v->val, strlen(val), (Byte *)val);
501 DEBUGF(VAR, ("%s:%s = %s\n", ctxt->name, name,
502 (char *)Buf_GetAll(v->val, (size_t *)NULL)));
504 if (v->flags & VAR_FROM_ENV) {
506 * If the original variable came from the environment, we
507 * have to install it in the global context (we could place
508 * it in the environment, but then we should provide a way to
509 * export other variables...)
511 v->flags &= ~VAR_FROM_ENV;
512 Lst_AtFront(&ctxt->context, v);
519 *-----------------------------------------------------------------------
521 * See if the given variable exists.
524 * TRUE if it does, FALSE if it doesn't
529 *-----------------------------------------------------------------------
532 Var_Exists(char *name, GNode *ctxt)
536 VarPossiblyExpand(&name, ctxt);
537 v = VarFind(name, ctxt, FIND_CMD|FIND_GLOBAL|FIND_ENV);
542 } else if (v->flags & VAR_FROM_ENV) {
544 Buf_Destroy(v->val, TRUE);
551 *-----------------------------------------------------------------------
553 * Return the value of the named variable in the given context
556 * The value if the variable exists, NULL if it doesn't
560 *-----------------------------------------------------------------------
563 Var_Value(char *name, GNode *ctxt, char **frp)
567 VarPossiblyExpand(&name, ctxt);
568 v = VarFind(name, ctxt, FIND_ENV | FIND_GLOBAL | FIND_CMD);
572 char *p = (char *)Buf_GetAll(v->val, (size_t *)NULL);
574 if (v->flags & VAR_FROM_ENV) {
575 Buf_Destroy(v->val, FALSE);
587 *-----------------------------------------------------------------------
589 * Modify each of the words of the passed string using the given
590 * function. Used to implement all modifiers.
593 * A string of all the words modified appropriately.
598 *-----------------------------------------------------------------------
601 VarModify(char *str, Boolean (*modProc)(const char *, Boolean, Buffer, void *),
604 Buffer buf; /* Buffer for the new string */
605 Boolean addSpace; /* TRUE if need to add a space to the
606 * buffer before adding the trimmed
608 char **av; /* word list [first word does not count] */
614 av = brk_string(str, &ac, FALSE);
616 for (i = 1; i < ac; i++)
617 addSpace = (*modProc)(av[i], addSpace, buf, datum);
619 Buf_AddByte (buf, '\0');
620 str = (char *)Buf_GetAll(buf, (size_t *)NULL);
621 Buf_Destroy(buf, FALSE);
626 *-----------------------------------------------------------------------
628 * Sort the words in the string.
631 * str String whose words should be sorted
632 * cmp A comparison function to control the ordering
635 * A string containing the words sorted
640 *-----------------------------------------------------------------------
643 VarSortWords(char *str, int (*cmp)(const void *, const void *))
650 av = brk_string(str, &ac, FALSE);
651 qsort(av + 1, ac - 1, sizeof(char *), cmp);
652 for (i = 1; i < ac; i++) {
653 Buf_AddBytes(buf, strlen(av[i]), (Byte *)av[i]);
654 Buf_AddByte(buf, (Byte)((i < ac - 1) ? ' ' : '\0'));
656 str = (char *)Buf_GetAll(buf, (size_t *)NULL);
657 Buf_Destroy(buf, FALSE);
662 SortIncreasing(const void *l, const void *r)
665 return (strcmp(*(const char* const*)l, *(const char* const*)r));
669 *-----------------------------------------------------------------------
671 * Pass through the tstr looking for 1) escaped delimiters,
672 * '$'s and backslashes (place the escaped character in
673 * uninterpreted) and 2) unescaped $'s that aren't before
674 * the delimiter (expand the variable substitution unless flags
675 * has VAR_NOSUBST set).
676 * Return the expanded string or NULL if the delimiter was missing
677 * If pattern is specified, handle escaped ampersands, and replace
678 * unescaped ampersands with the lhs of the pattern.
681 * A string of all the words modified appropriately.
682 * If length is specified, return the string length of the buffer
683 * If flags is specified and the last character of the pattern is a
684 * $ set the VAR_MATCH_END bit of flags.
688 *-----------------------------------------------------------------------
691 VarGetPattern(GNode *ctxt, int err, char **tstr, int delim, int *flags,
692 size_t *length, VarPattern *pattern)
695 Buffer buf = Buf_Init(0);
701 #define IS_A_MATCH(cp, delim) \
702 ((cp[0] == '\\') && ((cp[1] == delim) || \
703 (cp[1] == '\\') || (cp[1] == '$') || (pattern && (cp[1] == '&'))))
706 * Skim through until the matching delimiter is found;
707 * pick up variable substitutions on the way. Also allow
708 * backslashes to quote the delimiter, $, and \, but don't
709 * touch other backslashes.
711 for (cp = *tstr; *cp && (*cp != delim); cp++) {
712 if (IS_A_MATCH(cp, delim)) {
713 Buf_AddByte(buf, (Byte)cp[1]);
715 } else if (*cp == '$') {
716 if (cp[1] == delim) {
718 Buf_AddByte(buf, (Byte)*cp);
721 * Unescaped $ at end of pattern => anchor
724 *flags |= VAR_MATCH_END;
726 if (flags == NULL || (*flags & VAR_NOSUBST) == 0) {
732 * If unescaped dollar sign not before the
733 * delimiter, assume it's a variable
734 * substitution and recurse.
736 cp2 = Var_Parse(cp, ctxt, err, &len, &freeIt);
737 Buf_AddBytes(buf, strlen(cp2), (Byte *)cp2);
744 if (*cp2 == '(' || *cp2 == '{') {
746 * Find the end of this variable reference
747 * and suck it in without further ado.
748 * It will be interperated later.
751 int want = (*cp2 == '(') ? ')' : '}';
754 for (++cp2; *cp2 != '\0' && depth > 0; ++cp2) {
755 if (cp2[-1] != '\\') {
762 Buf_AddBytes(buf, cp2 - cp, (Byte *)cp);
765 Buf_AddByte(buf, (Byte)*cp);
769 else if (pattern && *cp == '&')
770 Buf_AddBytes(buf, pattern->leftLen, (Byte *)pattern->lhs);
772 Buf_AddByte(buf, (Byte)*cp);
775 Buf_AddByte(buf, (Byte)'\0');
783 cp = (char *)Buf_GetAll(buf, length);
784 *length -= 1; /* Don't count the NULL */
785 Buf_Destroy(buf, FALSE);
791 *-----------------------------------------------------------------------
793 * Quote shell meta-characters in the string
801 *-----------------------------------------------------------------------
804 Var_Quote(const char *str)
808 /* This should cover most shells :-( */
809 static char meta[] = "\n \t'`\";&<>()|*?{}[]\\$!#^~";
811 buf = Buf_Init(MAKE_BSIZE);
812 for (; *str; str++) {
813 if (strchr(meta, *str) != NULL)
814 Buf_AddByte(buf, (Byte)'\\');
815 Buf_AddByte(buf, (Byte)*str);
817 Buf_AddByte(buf, (Byte)'\0');
818 retstr = Buf_GetAll (buf, (int *)NULL);
819 Buf_Destroy(buf, FALSE);
824 *-----------------------------------------------------------------------
826 * Print the error caused by a regcomp or regexec call.
832 * An error gets printed.
834 *-----------------------------------------------------------------------
837 VarREError(int err, regex_t *pat, const char *str)
842 errlen = regerror(err, pat, 0, 0);
843 errbuf = emalloc(errlen);
844 regerror(err, pat, errbuf, errlen);
845 Error("%s: %s", str, errbuf);
850 *-----------------------------------------------------------------------
852 * Given the start of a variable invocation, extract the variable
853 * name and find its value, then modify it according to the
857 * The (possibly-modified) value of the variable or var_Error if the
858 * specification is invalid. The length of the specification is
859 * placed in *lengthPtr (for invalid specifications, this is just
860 * 2 to skip the '$' and the following letter, or 1 if '$' was the
861 * last character in the string).
862 * A Boolean in *freePtr telling whether the returned string should
863 * be freed by the caller.
868 *-----------------------------------------------------------------------
871 Var_Parse(char *str, GNode *ctxt, Boolean err, size_t *lengthPtr,
874 char *tstr; /* Pointer into str */
875 Var *v; /* Variable in invocation */
876 char *cp; /* Secondary pointer into str (place marker
878 Boolean haveModifier;/* TRUE if have modifiers for the variable */
879 char endc; /* Ending character when variable in parens
881 char startc=0; /* Starting character when variable in parens
883 int cnt; /* Used to count brace pairs when variable in
884 * in parens or braces */
887 Boolean dynamic; /* TRUE if the variable is local and we're
888 * expanding it in a non-local context. This
889 * is done to support dynamic sources. The
890 * result is just the invocation, unaltered */
891 int vlen; /* length of variable name, after embedded variable
898 if (str[1] != '(' && str[1] != '{') {
900 * If it's not bounded by braces of some sort, life is much simpler.
901 * We just need to check for the first character and return the
902 * value if it exists.
909 v = VarFind(name, ctxt, FIND_ENV | FIND_GLOBAL | FIND_CMD);
910 if (v == (Var *)NULL) {
916 if ((ctxt == VAR_CMD) || (ctxt == VAR_GLOBAL)) {
918 * If substituting a local variable in a non-local context,
919 * assume it's for dynamic source stuff. We have to handle
920 * this specially and return the longhand for the variable
921 * with the dollar sign escaped so it makes it back to the
922 * caller. Only four of the local variables are treated
923 * specially as they are the only four that will be set
924 * when dynamic sources are expanded.
926 /* XXX: It looks like $% and $! are reversed here */
929 return ("$(.TARGET)");
931 return ("$(.ARCHIVE)");
933 return ("$(.PREFIX)");
935 return ("$(.MEMBER)");
943 return (err ? var_Error : varNoError);
945 haveModifier = FALSE;
950 /* build up expanded variable name in this buffer */
951 Buffer buf = Buf_Init(MAKE_BSIZE);
954 endc = startc == '(' ? ')' : '}';
957 * Skip to the end character or a colon, whichever comes first,
958 * replacing embedded variables as we go.
960 for (tstr = str + 2; *tstr != '\0' && *tstr != endc && *tstr != ':'; tstr++)
964 char* rval = Var_Parse(tstr, ctxt, err, &rlen, &rfree);
966 if (rval == var_Error) {
967 Fatal("Error expanding embedded variable.");
968 } else if (rval != NULL) {
969 Buf_AddBytes(buf, strlen(rval), (Byte *)rval);
975 Buf_AddByte(buf, (Byte)*tstr);
979 * If we never did find the end character, return NULL
980 * right now, setting the length to be the distance to
981 * the end of the string, since that's what make does.
983 *lengthPtr = tstr - str;
987 haveModifier = (*tstr == ':');
990 Buf_AddByte(buf, (Byte)'\0');
991 str = Buf_GetAll(buf, (size_t *)NULL);
994 v = VarFind(str, ctxt, FIND_ENV | FIND_GLOBAL | FIND_CMD);
995 if ((v == (Var *)NULL) && (ctxt != VAR_CMD) && (ctxt != VAR_GLOBAL) &&
996 (vlen == 2) && (str[1] == 'F' || str[1] == 'D'))
999 * Check for bogus D and F forms of local variables since we're
1000 * in a local context and the name is the right length.
1014 * Well, it's local -- go look for it.
1018 v = VarFind(vname, ctxt, 0);
1020 if (v != NULL && !haveModifier) {
1022 * No need for nested expansion or anything, as we're
1023 * the only one who sets these things and we sure don't
1024 * put nested invocations in them...
1026 val = (char *)Buf_GetAll(v->val, (size_t *)NULL);
1028 if (str[1] == 'D') {
1029 val = VarModify(val, VarHead, (void *)NULL);
1031 val = VarModify(val, VarTail, (void *)NULL);
1034 * Resulting string is dynamically allocated, so
1035 * tell caller to free it.
1038 *lengthPtr = tstr-start+1;
1040 Buf_Destroy(buf, TRUE);
1050 if (v == (Var *)NULL) {
1052 (((vlen == 2) && (str[1] == 'F' || str[1] == 'D')))) &&
1053 ((ctxt == VAR_CMD) || (ctxt == VAR_GLOBAL)))
1056 * If substituting a local variable in a non-local context,
1057 * assume it's for dynamic source stuff. We have to handle
1058 * this specially and return the longhand for the variable
1059 * with the dollar sign escaped so it makes it back to the
1060 * caller. Only four of the local variables are treated
1061 * specially as they are the only four that will be set
1062 * when dynamic sources are expanded.
1074 } else if ((vlen > 2) && (str[0] == '.') &&
1075 isupper((unsigned char)str[1]) &&
1076 ((ctxt == VAR_CMD) || (ctxt == VAR_GLOBAL)))
1081 if ((strncmp(str, ".TARGET", len) == 0) ||
1082 (strncmp(str, ".ARCHIVE", len) == 0) ||
1083 (strncmp(str, ".PREFIX", len) == 0) ||
1084 (strncmp(str, ".MEMBER", len) == 0))
1090 if (!haveModifier) {
1092 * No modifiers -- have specification length so we can return
1095 *lengthPtr = tstr - start + 1;
1098 str = emalloc(*lengthPtr + 1);
1099 strncpy(str, start, *lengthPtr);
1100 str[*lengthPtr] = '\0';
1102 Buf_Destroy(buf, TRUE);
1105 Buf_Destroy(buf, TRUE);
1106 return (err ? var_Error : varNoError);
1110 * Still need to get to the end of the variable specification,
1111 * so kludge up a Var structure for the modifications
1113 v = emalloc(sizeof(Var));
1114 v->name = estrdup(str);
1115 v->val = Buf_Init(1);
1116 v->flags = VAR_JUNK;
1119 Buf_Destroy(buf, TRUE);
1122 if (v->flags & VAR_IN_USE) {
1123 Fatal("Variable %s is recursive.", v->name);
1126 v->flags |= VAR_IN_USE;
1129 * Before doing any modification, we have to make sure the value
1130 * has been fully expanded. If it looks like recursion might be
1131 * necessary (there's a dollar sign somewhere in the variable's value)
1132 * we just call Var_Subst to do any other substitutions that are
1133 * necessary. Note that the value returned by Var_Subst will have
1134 * been dynamically-allocated, so it will need freeing when we
1137 str = (char *)Buf_GetAll(v->val, (size_t *)NULL);
1138 if (strchr(str, '$') != (char *)NULL) {
1139 str = Var_Subst(NULL, str, ctxt, err);
1143 v->flags &= ~VAR_IN_USE;
1146 * Now we need to apply any modifiers the user wants applied.
1148 * :M<pattern> words which match the given <pattern>.
1149 * <pattern> is of the standard file
1151 * :S<d><pat1><d><pat2><d>[g]
1152 * Substitute <pat2> for <pat1> in the value
1153 * :C<d><pat1><d><pat2><d>[g]
1154 * Substitute <pat2> for regex <pat1> in the value
1155 * :H Substitute the head of each word
1156 * :T Substitute the tail of each word
1157 * :E Substitute the extension (minus '.') of
1159 * :R Substitute the root of each word
1160 * (pathname minus the suffix).
1161 * :lhs=rhs Like :S, but the rhs goes to the end of
1163 * :U Converts variable to upper-case.
1164 * :L Converts variable to lower-case.
1166 if ((str != NULL) && haveModifier) {
1168 * Skip initial colon while putting it back.
1171 while (*tstr != endc) {
1172 char *newStr; /* New value to return */
1173 char termc; /* Character which terminated scan */
1175 DEBUGF(VAR, ("Applying :%c to \"%s\"\n", *tstr, str));
1186 *cp != '\0' && *cp != ':' && *cp != endc;
1189 if (*cp == '\\' && (cp[1] == ':' || cp[1] == endc)) {
1198 * Need to compress the \:'s out of the pattern, so
1199 * allocate enough room to hold the uncompressed
1200 * pattern (note that cp started at tstr+1, so
1201 * cp - tstr takes the null byte into account) and
1202 * compress the pattern into the space.
1204 pattern = emalloc(cp - tstr);
1205 for (cp2 = pattern, cp = tstr + 1;
1209 if ((*cp == '\\') &&
1210 (cp[1] == ':' || cp[1] == endc)) {
1219 if (*tstr == 'M' || *tstr == 'm') {
1220 newStr = VarModify(str, VarMatch, pattern);
1222 newStr = VarModify(str, VarNoMatch, pattern);
1233 Buffer buf; /* Buffer for patterns */
1240 * If pattern begins with '^', it is anchored to the
1241 * start of the word -- skip over it and flag pattern.
1244 pattern.flags |= VAR_MATCH_START;
1251 * Pass through the lhs looking for 1) escaped delimiters,
1252 * '$'s and backslashes (place the escaped character in
1253 * uninterpreted) and 2) unescaped $'s that aren't before
1254 * the delimiter (expand the variable substitution).
1255 * The result is left in the Buffer buf.
1257 for (cp = tstr; *cp != '\0' && *cp != del; cp++) {
1258 if ((*cp == '\\') &&
1263 Buf_AddByte(buf, (Byte)cp[1]);
1265 } else if (*cp == '$') {
1268 * If unescaped dollar sign not before the
1269 * delimiter, assume it's a variable
1270 * substitution and recurse.
1276 cp2 = Var_Parse(cp, ctxt, err, &len, &freeIt);
1277 Buf_AddBytes(buf, strlen(cp2), (Byte *)cp2);
1284 * Unescaped $ at end of pattern => anchor
1287 pattern.flags |= VAR_MATCH_END;
1290 Buf_AddByte(buf, (Byte)*cp);
1294 Buf_AddByte(buf, (Byte)'\0');
1297 * If lhs didn't end with the delimiter, complain and
1301 Fatal("Unclosed substitution for %s (%c missing)",
1306 * Fetch pattern and destroy buffer, but preserve the data
1307 * in it, since that's our lhs. Note that Buf_GetAll
1308 * will return the actual number of bytes, which includes
1309 * the null byte, so we have to decrement the length by
1312 pattern.lhs = (char *)Buf_GetAll(buf, &pattern.leftLen);
1314 Buf_Destroy(buf, FALSE);
1317 * Now comes the replacement string. Three things need to
1318 * be done here: 1) need to compress escaped delimiters and
1319 * ampersands and 2) need to replace unescaped ampersands
1320 * with the l.h.s. (since this isn't regexp, we can do
1321 * it right here) and 3) expand any variable substitutions.
1326 for (cp = tstr; *cp != '\0' && *cp != del; cp++) {
1327 if ((*cp == '\\') &&
1333 Buf_AddByte(buf, (Byte)cp[1]);
1335 } else if ((*cp == '$') && (cp[1] != del)) {
1340 cp2 = Var_Parse(cp, ctxt, err, &len, &freeIt);
1341 Buf_AddBytes(buf, strlen(cp2), (Byte *)cp2);
1346 } else if (*cp == '&') {
1347 Buf_AddBytes(buf, pattern.leftLen,
1348 (Byte *)pattern.lhs);
1350 Buf_AddByte(buf, (Byte)*cp);
1354 Buf_AddByte(buf, (Byte)'\0');
1357 * If didn't end in delimiter character, complain
1360 Fatal("Unclosed substitution for %s (%c missing)",
1364 pattern.rhs = (char *)Buf_GetAll(buf, &pattern.rightLen);
1366 Buf_Destroy(buf, FALSE);
1369 * Check for global substitution. If 'g' after the final
1370 * delimiter, substitution is global and is marked that
1375 pattern.flags |= VAR_SUB_GLOBAL;
1380 * Global substitution of the empty string causes an
1381 * infinite number of matches, unless anchored by '^'
1382 * (start of string) or '$' (end of string). Catch the
1383 * infinite substitution here.
1384 * Note that flags can only contain the 3 bits we're
1385 * interested in so we don't have to mask unrelated
1386 * bits. We can test for equality.
1388 if (!pattern.leftLen && pattern.flags == VAR_SUB_GLOBAL)
1389 Fatal("Global substitution of the empty string");
1392 newStr = VarModify(str, VarSubstitute, &pattern);
1394 * Free the two strings.
1402 VarREPattern pattern;
1412 if ((re = VarGetPattern(ctxt, err, &cp, delim, NULL,
1413 NULL, NULL)) == NULL) {
1414 /* was: goto cleanup */
1415 *lengthPtr = cp - start + 1;
1419 Fatal("Unclosed substitution for %s (%c missing)",
1424 if ((pattern.replace = VarGetPattern(ctxt, err, &cp,
1425 delim, NULL, NULL, NULL)) == NULL){
1428 /* was: goto cleanup */
1429 *lengthPtr = cp - start + 1;
1433 Fatal("Unclosed substitution for %s (%c missing)",
1441 pattern.flags |= VAR_SUB_GLOBAL;
1444 pattern.flags |= VAR_SUB_ONE;
1454 error = regcomp(&pattern.re, re, REG_EXTENDED);
1457 *lengthPtr = cp - start + 1;
1458 VarREError(error, &pattern.re, "RE substitution error");
1459 free(pattern.replace);
1463 pattern.nsub = pattern.re.re_nsub + 1;
1464 if (pattern.nsub < 1)
1466 if (pattern.nsub > 10)
1468 pattern.matches = emalloc(pattern.nsub *
1469 sizeof(regmatch_t));
1470 newStr = VarModify(str, VarRESubstitute, &pattern);
1471 regfree(&pattern.re);
1472 free(pattern.replace);
1473 free(pattern.matches);
1477 if (tstr[1] == endc || tstr[1] == ':') {
1479 buf = Buf_Init(MAKE_BSIZE);
1480 for (cp = str; *cp ; cp++)
1481 Buf_AddByte(buf, (Byte)tolower(*cp));
1483 Buf_AddByte(buf, (Byte)'\0');
1484 newStr = (char *)Buf_GetAll(buf, (size_t *)NULL);
1485 Buf_Destroy(buf, FALSE);
1493 if (tstr[1] == endc || tstr[1] == ':') {
1494 newStr = VarSortWords(str, SortIncreasing);
1501 if (tstr[1] == endc || tstr[1] == ':') {
1502 newStr = Var_Quote(str);
1509 if (tstr[1] == endc || tstr[1] == ':') {
1510 newStr = VarModify(str, VarTail, (void *)NULL);
1517 if (tstr[1] == endc || tstr[1] == ':') {
1519 buf = Buf_Init(MAKE_BSIZE);
1520 for (cp = str; *cp ; cp++)
1521 Buf_AddByte(buf, (Byte)toupper(*cp));
1523 Buf_AddByte(buf, (Byte)'\0');
1524 newStr = (char *)Buf_GetAll(buf, (size_t *)NULL);
1525 Buf_Destroy(buf, FALSE);
1533 if (tstr[1] == endc || tstr[1] == ':') {
1534 newStr = VarModify(str, VarHead, (void *)NULL);
1541 if (tstr[1] == endc || tstr[1] == ':') {
1542 newStr = VarModify(str, VarSuffix, (void *)NULL);
1549 if (tstr[1] == endc || tstr[1] == ':') {
1550 newStr = VarModify(str, VarRoot, (void *)NULL);
1558 if (tstr[1] == 'h' && (tstr[2] == endc || tstr[2] == ':')) {
1560 newStr = Cmd_Exec(str, &error);
1573 * This can either be a bogus modifier or a System-V
1574 * substitution command.
1582 * First we make a pass through the string trying
1583 * to verify it is a SYSV-make-style translation:
1584 * it must be: <string1>=<string2>)
1588 while (*cp != '\0' && cnt) {
1591 /* continue looking for endc */
1593 else if (*cp == endc)
1595 else if (*cp == startc)
1600 if (*cp == endc && eqFound) {
1603 * Now we break this sucker into the lhs and
1604 * rhs. We must null terminate them of course.
1609 if ((pattern.lhs = VarGetPattern(ctxt,
1610 err, &cp, delim, &pattern.flags, &pattern.leftLen,
1612 /* was: goto cleanup */
1613 *lengthPtr = cp - start + 1;
1617 Fatal("Unclosed substitution for %s (%c missing)",
1623 if ((pattern.rhs = VarGetPattern(ctxt,
1624 err, &cp, delim, NULL, &pattern.rightLen,
1625 &pattern)) == NULL) {
1626 /* was: goto cleanup */
1627 *lengthPtr = cp - start + 1;
1631 Fatal("Unclosed substitution for %s (%c missing)",
1637 * SYSV modifications happen through the whole
1638 * string. Note the pattern is anchored at the end.
1642 newStr = VarModify(str, VarSYSVMatch, &pattern);
1651 Error("Unknown modifier '%c'\n", *tstr);
1653 *cp != ':' && *cp != endc && *cp != '\0';
1661 DEBUGF(VAR, ("Result is \"%s\"\n", newStr));
1667 if (str != var_Error) {
1672 if (termc == '\0') {
1673 Error("Unclosed variable specification for %s", v->name);
1674 } else if (termc == ':') {
1681 *lengthPtr = tstr - start + 1;
1683 *lengthPtr = tstr - start + 1;
1687 if (v->flags & VAR_FROM_ENV) {
1688 Boolean destroy = FALSE;
1690 if (str != (char *)Buf_GetAll(v->val, (size_t *)NULL)) {
1694 * Returning the value unmodified, so tell the caller to free
1700 Buf_Destroy(v->val, destroy);
1702 } else if (v->flags & VAR_JUNK) {
1704 * Perform any free'ing needed and set *freePtr to FALSE so the caller
1705 * doesn't try to free a static pointer.
1712 Buf_Destroy(v->val, TRUE);
1715 str = emalloc(*lengthPtr + 1);
1716 strncpy(str, start, *lengthPtr);
1717 str[*lengthPtr] = '\0';
1720 str = err ? var_Error : varNoError;
1727 *-----------------------------------------------------------------------
1729 * Substitute for all variables in the given string in the given context
1730 * If undefErr is TRUE, Parse_Error will be called when an undefined
1731 * variable is encountered.
1734 * The resulting string.
1737 * None. The old string must be freed by the caller
1738 *-----------------------------------------------------------------------
1741 Var_Subst(char *var, char *str, GNode *ctxt, Boolean undefErr)
1743 Buffer buf; /* Buffer for forming things */
1744 char *val; /* Value to substitute for a variable */
1745 size_t length; /* Length of the variable invocation */
1746 Boolean doFree; /* Set true if val should be freed */
1747 static Boolean errorReported; /* Set true if an error has already
1748 * been reported to prevent a plethora
1749 * of messages when recursing */
1751 buf = Buf_Init(MAKE_BSIZE);
1752 errorReported = FALSE;
1755 if (var == NULL && (*str == '$') && (str[1] == '$')) {
1757 * A dollar sign may be escaped either with another dollar sign.
1758 * In such a case, we skip over the escape character and store the
1759 * dollar sign into the buffer directly.
1762 Buf_AddByte(buf, (Byte)*str);
1764 } else if (*str != '$') {
1766 * Skip as many characters as possible -- either to the end of
1767 * the string or to the next dollar sign (variable invocation).
1771 for (cp = str++; *str != '$' && *str != '\0'; str++)
1773 Buf_AddBytes(buf, str - cp, (Byte *)cp);
1778 if (str[1] != '(' && str[1] != '{') {
1779 if (str[1] != *var || var[1] != '\0') {
1780 Buf_AddBytes(buf, 2, (Byte *)str);
1792 * Scan up to the end of the variable name.
1794 for (p = &str[2]; *p &&
1795 *p != ':' && *p != ')' && *p != '}'; p++)
1799 * A variable inside the variable. We cannot expand
1800 * the external variable yet, so we try again with
1804 Buf_AddBytes(buf, p - str, (Byte *)str);
1809 if (strncmp(var, str + 2, p - str - 2) != 0 ||
1810 var[p - str - 2] != '\0') {
1812 * Not the variable we want to expand, scan
1813 * until the next variable
1815 for (;*p != '$' && *p != '\0'; p++)
1817 Buf_AddBytes(buf, p - str, (Byte *)str);
1830 val = Var_Parse(str, ctxt, undefErr, &length, &doFree);
1833 * When we come down here, val should either point to the
1834 * value of this variable, suitably modified, or be NULL.
1835 * Length should be the total length of the potential
1836 * variable invocation (from $ to end character...)
1838 if (val == var_Error || val == varNoError) {
1840 * If performing old-time variable substitution, skip over
1841 * the variable and continue with the substitution. Otherwise,
1842 * store the dollar sign and advance str so we continue with
1847 } else if (undefErr) {
1849 * If variable is undefined, complain and skip the
1850 * variable. The complaint will stop us from doing anything
1851 * when the file is parsed.
1853 if (!errorReported) {
1854 Parse_Error(PARSE_FATAL,
1855 "Undefined variable \"%.*s\"",length,str);
1858 errorReported = TRUE;
1860 Buf_AddByte (buf, (Byte)*str);
1865 * We've now got a variable structure to store in. But first,
1866 * advance the string pointer.
1871 * Copy all the characters from the variable value straight
1872 * into the new string.
1874 Buf_AddBytes(buf, strlen(val), (Byte *)val);
1882 Buf_AddByte(buf, '\0');
1883 str = (char *)Buf_GetAll(buf, (size_t *)NULL);
1884 Buf_Destroy(buf, FALSE);
1889 *-----------------------------------------------------------------------
1891 * Return the tail from each of a list of words. Used to set the
1892 * System V local variables.
1895 * The resulting string.
1900 *-----------------------------------------------------------------------
1903 Var_GetTail(char *file)
1906 return (VarModify(file, VarTail, (void *)NULL));
1910 *-----------------------------------------------------------------------
1912 * Find the leading components of a (list of) filename(s).
1913 * XXX: VarHead does not replace foo by ., as (sun) System V make
1917 * The leading components.
1922 *-----------------------------------------------------------------------
1925 Var_GetHead(char *file)
1928 return (VarModify(file, VarHead, (void *)NULL));
1932 *-----------------------------------------------------------------------
1934 * Initialize the module
1940 * The VAR_CMD and VAR_GLOBAL contexts are created
1941 *-----------------------------------------------------------------------
1947 VAR_GLOBAL = Targ_NewGN("Global");
1948 VAR_CMD = Targ_NewGN("Command");
1951 /****************** PRINT DEBUGGING INFO *****************/
1953 VarPrintVar(void *vp, void *dummy __unused)
1955 Var *v = (Var *) vp;
1957 printf("%-16s = %s\n", v->name, (char *)Buf_GetAll(v->val, (size_t *)NULL));
1962 *-----------------------------------------------------------------------
1964 * print all variables in a context
1965 *-----------------------------------------------------------------------
1968 Var_Dump(GNode *ctxt)
1971 Lst_ForEach(&ctxt->context, VarPrintVar, (void *)NULL);