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
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
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
24 * without specific prior written permission.
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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
41 #include <sys/cdefs.h>
42 __FBSDID("$FreeBSD$");
46 * Variable-handling functions
49 * Var_Set Set the value of a variable in the given
50 * context. The variable is created if it doesn't
51 * yet exist. The value and variable name need not
54 * Var_Append Append more characters to an existing variable
55 * in the given context. The variable needn't
56 * exist already -- it will be created if it doesn't.
57 * A space is placed between the old value and the
60 * Var_Exists See if a variable exists.
62 * Var_Value Return the value of a variable in a context or
63 * NULL if the variable is undefined.
65 * Var_Subst Substitute named variable, or all variables if
66 * NULL in a string using
67 * the given context as the top-most one. If the
68 * third argument is non-zero, Parse_Error is
69 * called if any variables are undefined.
71 * Var_Parse Parse a variable expansion from a string and
72 * return the result and the number of characters
75 * Var_Delete Delete a variable in a context.
77 * Var_Init Initialize this module.
80 * Var_Dump Print out all variables defined in the given
83 * XXX: There's a lot of duplication in these functions.
87 #include <sys/types.h>
95 * This is a harmless return value for Var_Parse that can be used by Var_Subst
96 * to determine if there was an error in parsing -- easier than returning
97 * a flag, as things outside this module don't give a hoot.
99 char var_Error[] = "";
102 * Similar to var_Error, but returned when the 'err' flag for Var_Parse is
103 * set false. Why not just use a constant? Well, gcc likes to condense
104 * identical string instances...
106 static char varNoError[] = "";
109 * Internally, variables are contained in four different contexts.
110 * 1) the environment. They may not be changed. If an environment
111 * variable is appended-to, the result is placed in the global
113 * 2) the global context. Variables set in the Makefile are located in
114 * the global context. It is the penultimate context searched when
116 * 3) the command-line context. All variables set on the command line
117 * are placed in this context. They are UNALTERABLE once placed here.
118 * 4) the local context. Each target has associated with it a context
119 * list. On this list are located the structures describing such
120 * local variables as $(@) and $(*)
121 * The four contexts are searched in the reverse order from which they are
124 GNode *VAR_GLOBAL; /* variables from the makefile */
125 GNode *VAR_CMD; /* variables defined on the command-line */
127 static Lst allVars; /* List of all variables */
129 #define FIND_CMD 0x1 /* look in VAR_CMD when searching */
130 #define FIND_GLOBAL 0x2 /* look in VAR_GLOBAL as well */
131 #define FIND_ENV 0x4 /* look in the environment also */
133 static int VarCmp(void *, void *);
134 static void VarPossiblyExpand(char **, GNode *);
135 static Var *VarFind(char *, GNode *, int);
136 static void VarAdd(char *, char *, GNode *);
137 static void VarDelete(void *);
138 static char *VarGetPattern(GNode *, int, char **, int, int *, int *,
140 static char *VarModify(char *,
141 Boolean (*)(const char *, Boolean, Buffer, void *),
143 static int VarPrintVar(void *, void *);
146 *-----------------------------------------------------------------------
148 * See if the given variable matches the named one. Called from
149 * Lst_Find when searching for a variable of a given name.
152 * 0 if they match. non-zero otherwise.
156 *-----------------------------------------------------------------------
159 VarCmp (void *v, void *name)
161 return (strcmp ((char *) name, ((Var *) v)->name));
165 *-----------------------------------------------------------------------
166 * VarPossiblyExpand --
167 * Expand a variable name's embedded variables in the given context.
170 * The contents of name, possibly expanded.
173 * The caller must free the new contents or old contents of name.
174 *-----------------------------------------------------------------------
177 VarPossiblyExpand(char **name, GNode *ctxt)
179 if (strchr(*name, '$') != NULL)
180 *name = Var_Subst(NULL, *name, ctxt, 0);
182 *name = estrdup(*name);
186 *-----------------------------------------------------------------------
188 * Find the given variable in the given context and any other contexts
192 * FIND_GLOBAL set means look in the VAR_GLOBAL context too
193 * FIND_CMD set means to look in the VAR_CMD context too
194 * FIND_ENV set means to look in the environment
197 * A pointer to the structure describing the desired variable or
198 * NULL if the variable does not exist.
202 *-----------------------------------------------------------------------
205 VarFind (char *name, GNode *ctxt, int flags)
207 Boolean localCheckEnvFirst;
212 * If the variable name begins with a '.', it could very well be one of
213 * the local ones. We check the name against all the local variables
214 * and substitute the short version in for 'name' if it matches one of
217 if (*name == '.' && isupper((unsigned char) name[1]))
220 if (!strcmp(name, ".ALLSRC"))
222 if (!strcmp(name, ".ARCHIVE"))
226 if (!strcmp(name, ".IMPSRC"))
230 if (!strcmp(name, ".MEMBER"))
234 if (!strcmp(name, ".OODATE"))
238 if (!strcmp(name, ".PREFIX"))
242 if (!strcmp(name, ".TARGET"))
248 * Note whether this is one of the specific variables we were told through
249 * the -E flag to use environment-variable-override for.
251 if (Lst_Find (envFirstVars, (void *)name,
252 (int (*)(void *, void *)) strcmp) != NULL)
254 localCheckEnvFirst = TRUE;
256 localCheckEnvFirst = FALSE;
260 * First look for the variable in the given context. If it's not there,
261 * look for it in VAR_CMD, VAR_GLOBAL and the environment, in that order,
262 * depending on the FIND_* flags in 'flags'
264 var = Lst_Find (ctxt->context, (void *)name, VarCmp);
266 if ((var == NULL) && (flags & FIND_CMD) && (ctxt != VAR_CMD)) {
267 var = Lst_Find (VAR_CMD->context, (void *)name, VarCmp);
269 if ((var == NULL) && (flags & FIND_GLOBAL) && (ctxt != VAR_GLOBAL) &&
270 !checkEnvFirst && !localCheckEnvFirst)
272 var = Lst_Find (VAR_GLOBAL->context, (void *)name, VarCmp);
274 if ((var == NULL) && (flags & FIND_ENV)) {
277 if ((env = getenv (name)) != NULL) {
280 v = (Var *) emalloc(sizeof(Var));
281 v->name = estrdup(name);
285 v->val = Buf_Init(len);
286 Buf_AddBytes(v->val, len, (Byte *)env);
288 v->flags = VAR_FROM_ENV;
290 } else if ((checkEnvFirst || localCheckEnvFirst) &&
291 (flags & FIND_GLOBAL) && (ctxt != VAR_GLOBAL))
293 var = Lst_Find (VAR_GLOBAL->context, (void *)name, VarCmp);
295 return ((Var *) NULL);
297 return ((Var *)Lst_Datum(var));
302 } else if (var == NULL) {
303 return ((Var *) NULL);
305 return ((Var *) Lst_Datum (var));
310 *-----------------------------------------------------------------------
312 * Add a new variable of name name and value val to the given context.
318 * The new variable is placed at the front of the given context
319 * The name and val arguments are duplicated so they may
321 *-----------------------------------------------------------------------
324 VarAdd (char *name, char *val, GNode *ctxt)
329 v = (Var *) emalloc (sizeof (Var));
331 v->name = estrdup (name);
333 len = val ? strlen(val) : 0;
334 v->val = Buf_Init(len+1);
335 Buf_AddBytes(v->val, len, (Byte *)val);
339 (void) Lst_AtFront (ctxt->context, (void *)v);
340 (void) Lst_AtEnd (allVars, (void *) v);
341 DEBUGF(VAR, ("%s:%s = %s\n", ctxt->name, name, val));
346 *-----------------------------------------------------------------------
348 * Delete a variable and all the space associated with it.
355 *-----------------------------------------------------------------------
362 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, (void *)name, VarCmp);
391 v = (Var *)Lst_Datum(ln);
392 Lst_Remove(ctxt->context, ln);
393 ln = Lst_Member(allVars, v);
394 Lst_Remove(allVars, ln);
395 VarDelete((void *) v);
400 *-----------------------------------------------------------------------
402 * Set the variable name to the value val in the given context.
408 * If the variable doesn't yet exist, a new record is created for it.
409 * Else the old value is freed and the new one stuck in its place
412 * The variable is searched for only in its context before being
413 * created in that context. I.e. if the context is VAR_GLOBAL,
414 * only VAR_GLOBAL->context is searched. Likewise if it is VAR_CMD, only
415 * VAR_CMD->context is searched. This is done to avoid the literally
416 * thousands of unnecessary strcmp's that used to be done to
417 * set, say, $(@) or $(<).
418 *-----------------------------------------------------------------------
421 Var_Set (char *name, char *val, GNode *ctxt)
426 * We only look for a variable in the given context since anything set
427 * here will override anything in a lower context, so there's not much
428 * point in searching them all just to save a bit of memory...
430 VarPossiblyExpand(&name, ctxt);
431 v = VarFind (name, ctxt, 0);
432 if (v == (Var *) NULL) {
433 VarAdd (name, val, ctxt);
435 Buf_Discard(v->val, Buf_Size(v->val));
436 Buf_AddBytes(v->val, strlen(val), (Byte *)val);
438 DEBUGF(VAR, ("%s:%s = %s\n", ctxt->name, name, val));
441 * Any variables given on the command line are automatically exported
442 * to the environment (as per POSIX standard)
444 if (ctxt == VAR_CMD) {
445 setenv(name, val, 1);
451 *-----------------------------------------------------------------------
453 * The variable of the given name has the given value appended to it in
460 * If the variable doesn't exist, it is created. Else the strings
461 * are concatenated (with a space in between).
464 * Only if the variable is being sought in the global context is the
465 * environment searched.
466 * XXX: Knows its calling circumstances in that if called with ctxt
467 * an actual target, it will only search that context since only
468 * a local variable could be being appended to. This is actually
469 * a big win and must be tolerated.
470 *-----------------------------------------------------------------------
473 Var_Append (char *name, char *val, GNode *ctxt)
477 VarPossiblyExpand(&name, ctxt);
478 v = VarFind (name, ctxt, (ctxt == VAR_GLOBAL) ? FIND_ENV : 0);
480 if (v == (Var *) NULL) {
481 VarAdd (name, val, ctxt);
483 Buf_AddByte(v->val, (Byte)' ');
484 Buf_AddBytes(v->val, strlen(val), (Byte *)val);
486 DEBUGF(VAR, ("%s:%s = %s\n", ctxt->name, name,
487 (char *) Buf_GetAll(v->val, (int *)NULL)));
489 if (v->flags & VAR_FROM_ENV) {
491 * If the original variable came from the environment, we
492 * have to install it in the global context (we could place
493 * it in the environment, but then we should provide a way to
494 * export other variables...)
496 v->flags &= ~VAR_FROM_ENV;
497 Lst_AtFront(ctxt->context, (void *)v);
504 *-----------------------------------------------------------------------
506 * See if the given variable exists.
509 * TRUE if it does, FALSE if it doesn't
514 *-----------------------------------------------------------------------
517 Var_Exists(char *name, GNode *ctxt)
521 VarPossiblyExpand(&name, ctxt);
522 v = VarFind(name, ctxt, FIND_CMD|FIND_GLOBAL|FIND_ENV);
525 if (v == (Var *)NULL) {
527 } else if (v->flags & VAR_FROM_ENV) {
529 Buf_Destroy(v->val, TRUE);
536 *-----------------------------------------------------------------------
538 * Return the value of the named variable in the given context
541 * The value if the variable exists, NULL if it doesn't
545 *-----------------------------------------------------------------------
548 Var_Value (char *name, GNode *ctxt, char **frp)
552 VarPossiblyExpand(&name, ctxt);
553 v = VarFind (name, ctxt, FIND_ENV | FIND_GLOBAL | FIND_CMD);
556 if (v != (Var *) NULL) {
557 char *p = ((char *)Buf_GetAll(v->val, (int *)NULL));
558 if (v->flags & VAR_FROM_ENV) {
559 Buf_Destroy(v->val, FALSE);
565 return ((char *) NULL);
570 *-----------------------------------------------------------------------
572 * Modify each of the words of the passed string using the given
573 * function. Used to implement all modifiers.
576 * A string of all the words modified appropriately.
581 *-----------------------------------------------------------------------
584 VarModify (char *str, Boolean (*modProc)(const char *, Boolean, Buffer, void *),
587 Buffer buf; /* Buffer for the new string */
588 Boolean addSpace; /* TRUE if need to add a space to the
589 * buffer before adding the trimmed
591 char **av; /* word list [first word does not count] */
597 av = brk_string(str, &ac, FALSE);
599 for (i = 1; i < ac; i++)
600 addSpace = (*modProc)(av[i], addSpace, buf, datum);
602 Buf_AddByte (buf, '\0');
603 str = (char *)Buf_GetAll (buf, (int *)NULL);
604 Buf_Destroy (buf, FALSE);
609 *-----------------------------------------------------------------------
611 * Sort the words in the string.
614 * str String whose words should be sorted
615 * cmp A comparison function to control the ordering
618 * A string containing the words sorted
623 *-----------------------------------------------------------------------
626 VarSortWords(char *str, int (*cmp)(const void *, const void *))
633 av = brk_string(str, &ac, FALSE);
634 qsort((void*)(av + 1), ac - 1, sizeof(char*), cmp);
635 for (i = 1; i < ac; i++) {
636 Buf_AddBytes(buf, strlen(av[i]), (Byte *)av[i]);
637 Buf_AddByte(buf, (Byte)((i < ac - 1) ? ' ' : '\0'));
639 str = (char *)Buf_GetAll(buf, (int *)NULL);
640 Buf_Destroy(buf, FALSE);
645 SortIncreasing(const void *l, const void *r)
647 return (strcmp(*(const char* const*)l, *(const char* const*)r));
651 *-----------------------------------------------------------------------
653 * Pass through the tstr looking for 1) escaped delimiters,
654 * '$'s and backslashes (place the escaped character in
655 * uninterpreted) and 2) unescaped $'s that aren't before
656 * the delimiter (expand the variable substitution unless flags
657 * has VAR_NOSUBST set).
658 * Return the expanded string or NULL if the delimiter was missing
659 * If pattern is specified, handle escaped ampersands, and replace
660 * unescaped ampersands with the lhs of the pattern.
663 * A string of all the words modified appropriately.
664 * If length is specified, return the string length of the buffer
665 * If flags is specified and the last character of the pattern is a
666 * $ set the VAR_MATCH_END bit of flags.
670 *-----------------------------------------------------------------------
673 VarGetPattern(GNode *ctxt, int err, char **tstr, int delim, int *flags,
674 int *length, VarPattern *pattern)
677 Buffer buf = Buf_Init(0);
682 #define IS_A_MATCH(cp, delim) \
683 ((cp[0] == '\\') && ((cp[1] == delim) || \
684 (cp[1] == '\\') || (cp[1] == '$') || (pattern && (cp[1] == '&'))))
687 * Skim through until the matching delimiter is found;
688 * pick up variable substitutions on the way. Also allow
689 * backslashes to quote the delimiter, $, and \, but don't
690 * touch other backslashes.
692 for (cp = *tstr; *cp && (*cp != delim); cp++) {
693 if (IS_A_MATCH(cp, delim)) {
694 Buf_AddByte(buf, (Byte) cp[1]);
696 } else if (*cp == '$') {
697 if (cp[1] == delim) {
699 Buf_AddByte(buf, (Byte) *cp);
702 * Unescaped $ at end of pattern => anchor
705 *flags |= VAR_MATCH_END;
707 if (flags == NULL || (*flags & VAR_NOSUBST) == 0) {
713 * If unescaped dollar sign not before the
714 * delimiter, assume it's a variable
715 * substitution and recurse.
717 cp2 = Var_Parse(cp, ctxt, err, &len, &freeIt);
718 Buf_AddBytes(buf, strlen(cp2), (Byte *) cp2);
725 if (*cp2 == '(' || *cp2 == '{') {
727 * Find the end of this variable reference
728 * and suck it in without further ado.
729 * It will be interperated later.
732 int want = (*cp2 == '(') ? ')' : '}';
735 for (++cp2; *cp2 != '\0' && depth > 0; ++cp2) {
736 if (cp2[-1] != '\\') {
743 Buf_AddBytes(buf, cp2 - cp, (Byte *)cp);
746 Buf_AddByte(buf, (Byte) *cp);
750 else if (pattern && *cp == '&')
751 Buf_AddBytes(buf, pattern->leftLen, (Byte *)pattern->lhs);
753 Buf_AddByte(buf, (Byte) *cp);
756 Buf_AddByte(buf, (Byte) '\0');
765 cp = (char *) Buf_GetAll(buf, length);
766 *length -= 1; /* Don't count the NULL */
767 Buf_Destroy(buf, FALSE);
774 *-----------------------------------------------------------------------
776 * Quote shell meta-characters in the string
784 *-----------------------------------------------------------------------
787 Var_Quote(const char *str)
791 /* This should cover most shells :-( */
792 static char meta[] = "\n \t'`\";&<>()|*?{}[]\\$!#^~";
795 buf = Buf_Init (MAKE_BSIZE);
796 for (; *str; str++) {
797 if (strchr(meta, *str) != NULL)
798 Buf_AddByte(buf, (Byte)'\\');
799 Buf_AddByte(buf, (Byte)*str);
801 Buf_AddByte(buf, (Byte) '\0');
802 ret = Buf_GetAll (buf, NULL);
803 Buf_Destroy (buf, FALSE);
808 *-----------------------------------------------------------------------
810 * Print the error caused by a regcomp or regexec call.
816 * An error gets printed.
818 *-----------------------------------------------------------------------
821 VarREError(int err, regex_t *pat, const char *str)
826 errlen = regerror(err, pat, 0, 0);
827 errbuf = emalloc(errlen);
828 regerror(err, pat, errbuf, errlen);
829 Error("%s: %s", str, errbuf);
834 *-----------------------------------------------------------------------
836 * Given the start of a variable invocation, extract the variable
837 * name and find its value, then modify it according to the
841 * The (possibly-modified) value of the variable or var_Error if the
842 * specification is invalid. The length of the specification is
843 * placed in *lengthPtr (for invalid specifications, this is just
844 * 2 to skip the '$' and the following letter, or 1 if '$' was the
845 * last character in the string).
846 * A Boolean in *freePtr telling whether the returned string should
847 * be freed by the caller.
852 *-----------------------------------------------------------------------
855 Var_Parse(char *str, GNode *ctxt, Boolean err, int *lengthPtr, Boolean *freePtr)
857 char *tstr; /* Pointer into str */
858 Var *v; /* Variable in invocation */
859 char *cp; /* Secondary pointer into str (place marker
861 Boolean haveModifier;/* TRUE if have modifiers for the variable */
862 char endc; /* Ending character when variable in parens
864 char startc=0; /* Starting character when variable in parens
866 int cnt; /* Used to count brace pairs when variable in
867 * in parens or braces */
870 Boolean dynamic; /* TRUE if the variable is local and we're
871 * expanding it in a non-local context. This
872 * is done to support dynamic sources. The
873 * result is just the invocation, unaltered */
874 int vlen; /* length of variable name, after embedded variable
881 if (str[1] != '(' && str[1] != '{') {
883 * If it's not bounded by braces of some sort, life is much simpler.
884 * We just need to check for the first character and return the
885 * value if it exists.
892 v = VarFind (name, ctxt, FIND_ENV | FIND_GLOBAL | FIND_CMD);
893 if (v == (Var *)NULL) {
899 if ((ctxt == VAR_CMD) || (ctxt == VAR_GLOBAL)) {
901 * If substituting a local variable in a non-local context,
902 * assume it's for dynamic source stuff. We have to handle
903 * this specially and return the longhand for the variable
904 * with the dollar sign escaped so it makes it back to the
905 * caller. Only four of the local variables are treated
906 * specially as they are the only four that will be set
907 * when dynamic sources are expanded.
909 /* XXX: It looks like $% and $! are reversed here */
912 return("$(.TARGET)");
914 return("$(.ARCHIVE)");
916 return("$(.PREFIX)");
918 return("$(.MEMBER)");
926 return (err ? var_Error : varNoError);
928 haveModifier = FALSE;
933 /* build up expanded variable name in this buffer */
934 Buffer buf = Buf_Init(MAKE_BSIZE);
937 endc = startc == '(' ? ')' : '}';
940 * Skip to the end character or a colon, whichever comes first,
941 * replacing embedded variables as we go.
943 for (tstr = str + 2; *tstr != '\0' && *tstr != endc && *tstr != ':'; tstr++)
947 char* rval = Var_Parse(tstr, ctxt, err, &rlen, &rfree);
949 if (rval == var_Error) {
950 Fatal("Error expanding embedded variable.");
951 } else if (rval != NULL) {
952 Buf_AddBytes(buf, strlen(rval), (Byte *) rval);
958 Buf_AddByte(buf, (Byte) *tstr);
962 * If we never did find the end character, return NULL
963 * right now, setting the length to be the distance to
964 * the end of the string, since that's what make does.
966 *lengthPtr = tstr - str;
970 haveModifier = (*tstr == ':');
973 Buf_AddByte(buf, (Byte) '\0');
974 str = Buf_GetAll(buf, NULL);
977 v = VarFind (str, ctxt, FIND_ENV | FIND_GLOBAL | FIND_CMD);
978 if ((v == (Var *)NULL) && (ctxt != VAR_CMD) && (ctxt != VAR_GLOBAL) &&
979 (vlen == 2) && (str[1] == 'F' || str[1] == 'D'))
982 * Check for bogus D and F forms of local variables since we're
983 * in a local context and the name is the right length.
997 * Well, it's local -- go look for it.
1001 v = VarFind(vname, ctxt, 0);
1003 if (v != (Var *)NULL && !haveModifier) {
1005 * No need for nested expansion or anything, as we're
1006 * the only one who sets these things and we sure don't
1007 * put nested invocations in them...
1009 val = (char *)Buf_GetAll(v->val, (int *)NULL);
1011 if (str[1] == 'D') {
1012 val = VarModify(val, VarHead, (void *)0);
1014 val = VarModify(val, VarTail, (void *)0);
1017 * Resulting string is dynamically allocated, so
1018 * tell caller to free it.
1021 *lengthPtr = tstr-start+1;
1023 Buf_Destroy(buf, TRUE);
1033 if (v == (Var *)NULL) {
1035 (((vlen == 2) && (str[1] == 'F' ||
1036 str[1] == 'D')))) &&
1037 ((ctxt == VAR_CMD) || (ctxt == VAR_GLOBAL)))
1040 * If substituting a local variable in a non-local context,
1041 * assume it's for dynamic source stuff. We have to handle
1042 * this specially and return the longhand for the variable
1043 * with the dollar sign escaped so it makes it back to the
1044 * caller. Only four of the local variables are treated
1045 * specially as they are the only four that will be set
1046 * when dynamic sources are expanded.
1058 } else if ((vlen > 2) && (str[0] == '.') &&
1059 isupper((unsigned char) str[1]) &&
1060 ((ctxt == VAR_CMD) || (ctxt == VAR_GLOBAL)))
1065 if ((strncmp(str, ".TARGET", len) == 0) ||
1066 (strncmp(str, ".ARCHIVE", len) == 0) ||
1067 (strncmp(str, ".PREFIX", len) == 0) ||
1068 (strncmp(str, ".MEMBER", len) == 0))
1074 if (!haveModifier) {
1076 * No modifiers -- have specification length so we can return
1079 *lengthPtr = tstr - start + 1;
1082 str = emalloc(*lengthPtr + 1);
1083 strncpy(str, start, *lengthPtr);
1084 str[*lengthPtr] = '\0';
1086 Buf_Destroy(buf, TRUE);
1089 Buf_Destroy(buf, TRUE);
1090 return (err ? var_Error : varNoError);
1094 * Still need to get to the end of the variable specification,
1095 * so kludge up a Var structure for the modifications
1097 v = (Var *) emalloc(sizeof(Var));
1098 v->name = estrdup(str);
1099 v->val = Buf_Init(1);
1100 v->flags = VAR_JUNK;
1103 Buf_Destroy(buf, TRUE);
1106 if (v->flags & VAR_IN_USE) {
1107 Fatal("Variable %s is recursive.", v->name);
1110 v->flags |= VAR_IN_USE;
1113 * Before doing any modification, we have to make sure the value
1114 * has been fully expanded. If it looks like recursion might be
1115 * necessary (there's a dollar sign somewhere in the variable's value)
1116 * we just call Var_Subst to do any other substitutions that are
1117 * necessary. Note that the value returned by Var_Subst will have
1118 * been dynamically-allocated, so it will need freeing when we
1121 str = (char *)Buf_GetAll(v->val, (int *)NULL);
1122 if (strchr (str, '$') != (char *)NULL) {
1123 str = Var_Subst(NULL, str, ctxt, err);
1127 v->flags &= ~VAR_IN_USE;
1130 * Now we need to apply any modifiers the user wants applied.
1132 * :M<pattern> words which match the given <pattern>.
1133 * <pattern> is of the standard file
1135 * :S<d><pat1><d><pat2><d>[g]
1136 * Substitute <pat2> for <pat1> in the value
1137 * :C<d><pat1><d><pat2><d>[g]
1138 * Substitute <pat2> for regex <pat1> in the value
1139 * :H Substitute the head of each word
1140 * :T Substitute the tail of each word
1141 * :E Substitute the extension (minus '.') of
1143 * :R Substitute the root of each word
1144 * (pathname minus the suffix).
1145 * :lhs=rhs Like :S, but the rhs goes to the end of
1147 * :U Converts variable to upper-case.
1148 * :L Converts variable to lower-case.
1150 if ((str != (char *)NULL) && haveModifier) {
1152 * Skip initial colon while putting it back.
1155 while (*tstr != endc) {
1156 char *newStr; /* New value to return */
1157 char termc; /* Character which terminated scan */
1159 DEBUGF(VAR, ("Applying :%c to \"%s\"\n", *tstr, str));
1170 *cp != '\0' && *cp != ':' && *cp != endc;
1173 if (*cp == '\\' && (cp[1] == ':' || cp[1] == endc)){
1182 * Need to compress the \:'s out of the pattern, so
1183 * allocate enough room to hold the uncompressed
1184 * pattern (note that cp started at tstr+1, so
1185 * cp - tstr takes the null byte into account) and
1186 * compress the pattern into the space.
1188 pattern = emalloc(cp - tstr);
1189 for (cp2 = pattern, cp = tstr + 1;
1193 if ((*cp == '\\') &&
1194 (cp[1] == ':' || cp[1] == endc)) {
1203 if (*tstr == 'M' || *tstr == 'm') {
1204 newStr = VarModify(str, VarMatch, (void *)pattern);
1206 newStr = VarModify(str, VarNoMatch,
1218 Buffer buf; /* Buffer for patterns */
1225 * If pattern begins with '^', it is anchored to the
1226 * start of the word -- skip over it and flag pattern.
1229 pattern.flags |= VAR_MATCH_START;
1236 * Pass through the lhs looking for 1) escaped delimiters,
1237 * '$'s and backslashes (place the escaped character in
1238 * uninterpreted) and 2) unescaped $'s that aren't before
1239 * the delimiter (expand the variable substitution).
1240 * The result is left in the Buffer buf.
1242 for (cp = tstr; *cp != '\0' && *cp != del; cp++) {
1243 if ((*cp == '\\') &&
1248 Buf_AddByte(buf, (Byte)cp[1]);
1250 } else if (*cp == '$') {
1253 * If unescaped dollar sign not before the
1254 * delimiter, assume it's a variable
1255 * substitution and recurse.
1261 cp2 = Var_Parse(cp, ctxt, err, &len, &freeIt);
1262 Buf_AddBytes(buf, strlen(cp2), (Byte *)cp2);
1269 * Unescaped $ at end of pattern => anchor
1272 pattern.flags |= VAR_MATCH_END;
1275 Buf_AddByte(buf, (Byte)*cp);
1279 Buf_AddByte(buf, (Byte)'\0');
1282 * If lhs didn't end with the delimiter, complain and
1286 Fatal("Unclosed substitution for %s (%c missing)",
1291 * Fetch pattern and destroy buffer, but preserve the data
1292 * in it, since that's our lhs. Note that Buf_GetAll
1293 * will return the actual number of bytes, which includes
1294 * the null byte, so we have to decrement the length by
1297 pattern.lhs = (char *)Buf_GetAll(buf, &pattern.leftLen);
1299 Buf_Destroy(buf, FALSE);
1302 * Now comes the replacement string. Three things need to
1303 * be done here: 1) need to compress escaped delimiters and
1304 * ampersands and 2) need to replace unescaped ampersands
1305 * with the l.h.s. (since this isn't regexp, we can do
1306 * it right here) and 3) expand any variable substitutions.
1311 for (cp = tstr; *cp != '\0' && *cp != del; cp++) {
1312 if ((*cp == '\\') &&
1318 Buf_AddByte(buf, (Byte)cp[1]);
1320 } else if ((*cp == '$') && (cp[1] != del)) {
1325 cp2 = Var_Parse(cp, ctxt, err, &len, &freeIt);
1326 Buf_AddBytes(buf, strlen(cp2), (Byte *)cp2);
1331 } else if (*cp == '&') {
1332 Buf_AddBytes(buf, pattern.leftLen,
1333 (Byte *)pattern.lhs);
1335 Buf_AddByte(buf, (Byte)*cp);
1339 Buf_AddByte(buf, (Byte)'\0');
1342 * If didn't end in delimiter character, complain
1345 Fatal("Unclosed substitution for %s (%c missing)",
1349 pattern.rhs = (char *)Buf_GetAll(buf, &pattern.rightLen);
1351 Buf_Destroy(buf, FALSE);
1354 * Check for global substitution. If 'g' after the final
1355 * delimiter, substitution is global and is marked that
1360 pattern.flags |= VAR_SUB_GLOBAL;
1365 * Global substitution of the empty string causes an
1366 * infinite number of matches, unless anchored by '^'
1367 * (start of string) or '$' (end of string). Catch the
1368 * infinite substitution here.
1369 * Note that flags can only contain the 3 bits we're
1370 * interested in so we don't have to mask unrelated
1371 * bits. We can test for equality.
1373 if (!pattern.leftLen && pattern.flags == VAR_SUB_GLOBAL)
1374 Fatal("Global substitution of the empty string");
1377 newStr = VarModify(str, VarSubstitute,
1380 * Free the two strings.
1388 VarREPattern pattern;
1398 if ((re = VarGetPattern(ctxt, err, &cp, delim, NULL,
1399 NULL, NULL)) == NULL) {
1400 /* was: goto cleanup */
1401 *lengthPtr = cp - start + 1;
1405 Fatal("Unclosed substitution for %s (%c missing)",
1410 if ((pattern.replace = VarGetPattern(ctxt, err, &cp,
1411 delim, NULL, NULL, NULL)) == NULL){
1414 /* was: goto cleanup */
1415 *lengthPtr = cp - start + 1;
1419 Fatal("Unclosed substitution for %s (%c missing)",
1427 pattern.flags |= VAR_SUB_GLOBAL;
1430 pattern.flags |= VAR_SUB_ONE;
1440 error = regcomp(&pattern.re, re, REG_EXTENDED);
1443 *lengthPtr = cp - start + 1;
1444 VarREError(error, &pattern.re, "RE substitution error");
1445 free(pattern.replace);
1449 pattern.nsub = pattern.re.re_nsub + 1;
1450 if (pattern.nsub < 1)
1452 if (pattern.nsub > 10)
1454 pattern.matches = emalloc(pattern.nsub *
1455 sizeof(regmatch_t));
1456 newStr = VarModify(str, VarRESubstitute,
1458 regfree(&pattern.re);
1459 free(pattern.replace);
1460 free(pattern.matches);
1464 if (tstr[1] == endc || tstr[1] == ':') {
1466 buf = Buf_Init(MAKE_BSIZE);
1467 for (cp = str; *cp ; cp++)
1468 Buf_AddByte(buf, (Byte) tolower(*cp));
1470 Buf_AddByte(buf, (Byte) '\0');
1471 newStr = (char *) Buf_GetAll(buf, (int *) NULL);
1472 Buf_Destroy(buf, FALSE);
1480 if (tstr[1] == endc || tstr[1] == ':') {
1481 newStr = VarSortWords(str, SortIncreasing);
1488 if (tstr[1] == endc || tstr[1] == ':') {
1489 newStr = Var_Quote (str);
1496 if (tstr[1] == endc || tstr[1] == ':') {
1497 newStr = VarModify (str, VarTail, (void *)0);
1504 if (tstr[1] == endc || tstr[1] == ':') {
1506 buf = Buf_Init(MAKE_BSIZE);
1507 for (cp = str; *cp ; cp++)
1508 Buf_AddByte(buf, (Byte) toupper(*cp));
1510 Buf_AddByte(buf, (Byte) '\0');
1511 newStr = (char *) Buf_GetAll(buf, (int *) NULL);
1512 Buf_Destroy(buf, FALSE);
1520 if (tstr[1] == endc || tstr[1] == ':') {
1521 newStr = VarModify (str, VarHead, (void *)0);
1528 if (tstr[1] == endc || tstr[1] == ':') {
1529 newStr = VarModify (str, VarSuffix, (void *)0);
1536 if (tstr[1] == endc || tstr[1] == ':') {
1537 newStr = VarModify (str, VarRoot, (void *)0);
1545 if (tstr[1] == 'h' && (tstr[2] == endc || tstr[2] == ':')) {
1547 newStr = Cmd_Exec (str, &error);
1560 * This can either be a bogus modifier or a System-V
1561 * substitution command.
1569 * First we make a pass through the string trying
1570 * to verify it is a SYSV-make-style translation:
1571 * it must be: <string1>=<string2>)
1575 while (*cp != '\0' && cnt) {
1578 /* continue looking for endc */
1580 else if (*cp == endc)
1582 else if (*cp == startc)
1587 if (*cp == endc && eqFound) {
1590 * Now we break this sucker into the lhs and
1591 * rhs. We must null terminate them of course.
1596 if ((pattern.lhs = VarGetPattern(ctxt,
1597 err, &cp, delim, &pattern.flags, &pattern.leftLen,
1599 /* was: goto cleanup */
1600 *lengthPtr = cp - start + 1;
1604 Fatal("Unclosed substitution for %s (%c missing)",
1610 if ((pattern.rhs = VarGetPattern(ctxt,
1611 err, &cp, delim, NULL, &pattern.rightLen,
1612 &pattern)) == NULL) {
1613 /* was: goto cleanup */
1614 *lengthPtr = cp - start + 1;
1618 Fatal("Unclosed substitution for %s (%c missing)",
1624 * SYSV modifications happen through the whole
1625 * string. Note the pattern is anchored at the end.
1629 newStr = VarModify(str, VarSYSVMatch,
1639 Error ("Unknown modifier '%c'\n", *tstr);
1641 *cp != ':' && *cp != endc && *cp != '\0';
1649 DEBUGF(VAR, ("Result is \"%s\"\n", newStr));
1655 if (str != var_Error) {
1660 if (termc == '\0') {
1661 Error("Unclosed variable specification for %s", v->name);
1662 } else if (termc == ':') {
1669 *lengthPtr = tstr - start + 1;
1671 *lengthPtr = tstr - start + 1;
1675 if (v->flags & VAR_FROM_ENV) {
1676 Boolean destroy = FALSE;
1678 if (str != (char *)Buf_GetAll(v->val, (int *)NULL)) {
1682 * Returning the value unmodified, so tell the caller to free
1688 Buf_Destroy(v->val, destroy);
1690 } else if (v->flags & VAR_JUNK) {
1692 * Perform any free'ing needed and set *freePtr to FALSE so the caller
1693 * doesn't try to free a static pointer.
1700 Buf_Destroy(v->val, TRUE);
1703 str = emalloc(*lengthPtr + 1);
1704 strncpy(str, start, *lengthPtr);
1705 str[*lengthPtr] = '\0';
1708 str = err ? var_Error : varNoError;
1715 *-----------------------------------------------------------------------
1717 * Substitute for all variables in the given string in the given context
1718 * If undefErr is TRUE, Parse_Error will be called when an undefined
1719 * variable is encountered.
1722 * The resulting string.
1725 * None. The old string must be freed by the caller
1726 *-----------------------------------------------------------------------
1729 Var_Subst (char *var, char *str, GNode *ctxt, Boolean undefErr)
1731 Buffer buf; /* Buffer for forming things */
1732 char *val; /* Value to substitute for a variable */
1733 int length; /* Length of the variable invocation */
1734 Boolean doFree; /* Set true if val should be freed */
1735 static Boolean errorReported; /* Set true if an error has already
1736 * been reported to prevent a plethora
1737 * of messages when recursing */
1739 buf = Buf_Init (MAKE_BSIZE);
1740 errorReported = FALSE;
1743 if (var == NULL && (*str == '$') && (str[1] == '$')) {
1745 * A dollar sign may be escaped either with another dollar sign.
1746 * In such a case, we skip over the escape character and store the
1747 * dollar sign into the buffer directly.
1750 Buf_AddByte(buf, (Byte)*str);
1752 } else if (*str != '$') {
1754 * Skip as many characters as possible -- either to the end of
1755 * the string or to the next dollar sign (variable invocation).
1759 for (cp = str++; *str != '$' && *str != '\0'; str++)
1761 Buf_AddBytes(buf, str - cp, (Byte *)cp);
1766 if (str[1] != '(' && str[1] != '{') {
1767 if (str[1] != *var || var[1] != '\0') {
1768 Buf_AddBytes(buf, 2, (Byte *) str);
1780 * Scan up to the end of the variable name.
1782 for (p = &str[2]; *p &&
1783 *p != ':' && *p != ')' && *p != '}'; p++)
1787 * A variable inside the variable. We cannot expand
1788 * the external variable yet, so we try again with
1792 Buf_AddBytes(buf, p - str, (Byte *) str);
1797 if (strncmp(var, str + 2, p - str - 2) != 0 ||
1798 var[p - str - 2] != '\0') {
1800 * Not the variable we want to expand, scan
1801 * until the next variable
1803 for (;*p != '$' && *p != '\0'; p++)
1805 Buf_AddBytes(buf, p - str, (Byte *) str);
1818 val = Var_Parse (str, ctxt, undefErr, &length, &doFree);
1821 * When we come down here, val should either point to the
1822 * value of this variable, suitably modified, or be NULL.
1823 * Length should be the total length of the potential
1824 * variable invocation (from $ to end character...)
1826 if (val == var_Error || val == varNoError) {
1828 * If performing old-time variable substitution, skip over
1829 * the variable and continue with the substitution. Otherwise,
1830 * store the dollar sign and advance str so we continue with
1835 } else if (undefErr) {
1837 * If variable is undefined, complain and skip the
1838 * variable. The complaint will stop us from doing anything
1839 * when the file is parsed.
1841 if (!errorReported) {
1842 Parse_Error (PARSE_FATAL,
1843 "Undefined variable \"%.*s\"",length,str);
1846 errorReported = TRUE;
1848 Buf_AddByte (buf, (Byte)*str);
1853 * We've now got a variable structure to store in. But first,
1854 * advance the string pointer.
1859 * Copy all the characters from the variable value straight
1860 * into the new string.
1862 Buf_AddBytes (buf, strlen (val), (Byte *)val);
1870 Buf_AddByte (buf, '\0');
1871 str = (char *)Buf_GetAll (buf, (int *)NULL);
1872 Buf_Destroy (buf, FALSE);
1877 *-----------------------------------------------------------------------
1879 * Return the tail from each of a list of words. Used to set the
1880 * System V local variables.
1883 * The resulting string.
1888 *-----------------------------------------------------------------------
1891 Var_GetTail(char *file)
1893 return(VarModify(file, VarTail, (void *)0));
1897 *-----------------------------------------------------------------------
1899 * Find the leading components of a (list of) filename(s).
1900 * XXX: VarHead does not replace foo by ., as (sun) System V make
1904 * The leading components.
1909 *-----------------------------------------------------------------------
1912 Var_GetHead(char *file)
1914 return(VarModify(file, VarHead, (void *)0));
1918 *-----------------------------------------------------------------------
1920 * Initialize the module
1926 * The VAR_CMD and VAR_GLOBAL contexts are created
1927 *-----------------------------------------------------------------------
1932 VAR_GLOBAL = Targ_NewGN ("Global");
1933 VAR_CMD = Targ_NewGN ("Command");
1934 allVars = Lst_Init(FALSE);
1942 Lst_Destroy(allVars, VarDelete);
1946 /****************** PRINT DEBUGGING INFO *****************/
1948 VarPrintVar (void *vp, void *dummy __unused)
1950 Var *v = (Var *) vp;
1951 printf ("%-16s = %s\n", v->name, (char *) Buf_GetAll(v->val, (int *)NULL));
1956 *-----------------------------------------------------------------------
1958 * print all variables in a context
1959 *-----------------------------------------------------------------------
1962 Var_Dump (GNode *ctxt)
1964 Lst_ForEach (ctxt->context, VarPrintVar, (void *) 0);