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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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 1.69 2005/02/09 06:03:05 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.
102 * This is a harmless return value for Var_Parse that can be used by Var_Subst
103 * to determine if there was an error in parsing -- easier than returning
104 * a flag, as things outside this module don't give a hoot.
106 char var_Error[] = "";
109 * Similar to var_Error, but returned when the 'err' flag for Var_Parse is
110 * set false. Why not just use a constant? Well, gcc likes to condense
111 * identical string instances...
113 static char varNoError[] = "";
116 * Internally, variables are contained in four different contexts.
117 * 1) the environment. They may not be changed. If an environment
118 * variable is appended-to, the result is placed in the global
120 * 2) the global context. Variables set in the Makefile are located in
121 * the global context. It is the penultimate context searched when
123 * 3) the command-line context. All variables set on the command line
124 * are placed in this context. They are UNALTERABLE once placed here.
125 * 4) the local context. Each target has associated with it a context
126 * list. On this list are located the structures describing such
127 * local variables as $(@) and $(*)
128 * The four contexts are searched in the reverse order from which they are
131 GNode *VAR_GLOBAL; /* variables from the makefile */
132 GNode *VAR_CMD; /* variables defined on the command-line */
134 #define FIND_CMD 0x1 /* look in VAR_CMD when searching */
135 #define FIND_GLOBAL 0x2 /* look in VAR_GLOBAL as well */
136 #define FIND_ENV 0x4 /* look in the environment also */
138 #define OPEN_PAREN '('
139 #define CLOSE_PAREN ')'
140 #define OPEN_BRACKET '{'
141 #define CLOSE_BRACKET '}'
143 static Var *VarCreate(const char [], const char [], int);
144 static void VarDestroy(Var *, Boolean);
145 static char *VarGetPattern(GNode *, int, char **, int, int *, size_t *,
147 static int VarPrintVar(void *, void *);
150 *-----------------------------------------------------------------------
152 * See if the given variable matches the named one. Called from
153 * Lst_Find when searching for a variable of a given name.
156 * 0 if they match. non-zero otherwise.
160 *-----------------------------------------------------------------------
163 VarCmp(const void *v, const void *name)
166 return (strcmp(name, ((const Var *)v)->name));
170 *-----------------------------------------------------------------------
171 * VarPossiblyExpand --
172 * Expand a variable name's embedded variables in the given context.
175 * The contents of name, possibly expanded.
176 *-----------------------------------------------------------------------
179 VarPossiblyExpand(const char *name, GNode *ctxt)
184 * XXX make a temporary copy of the name because Var_Subst insists
185 * on writing into the string.
188 if (strchr(name, '$') != NULL) {
192 buf = Var_Subst(NULL, tmp, ctxt, 0);
193 str = Buf_GetAll(buf, NULL);
194 Buf_Destroy(buf, FALSE);
203 *-----------------------------------------------------------------------
205 * Find the given variable in the given context and any other contexts
209 * FIND_GLOBAL set means look in the VAR_GLOBAL context too
210 * FIND_CMD set means to look in the VAR_CMD context too
211 * FIND_ENV set means to look in the environment
214 * A pointer to the structure describing the desired variable or
215 * NULL if the variable does not exist.
219 *-----------------------------------------------------------------------
222 VarFind(const char *name, GNode *ctxt, int flags)
224 Boolean localCheckEnvFirst;
229 * If the variable name begins with a '.', it could very well be one of
230 * the local ones. We check the name against all the local variables
231 * and substitute the short version in for 'name' if it matches one of
234 if (name[0] == '.') {
237 if (!strcmp(name, ".ALLSRC"))
239 if (!strcmp(name, ".ARCHIVE"))
243 if (!strcmp(name, ".IMPSRC"))
247 if (!strcmp(name, ".MEMBER"))
251 if (!strcmp(name, ".OODATE"))
255 if (!strcmp(name, ".PREFIX"))
259 if (!strcmp(name, ".TARGET"))
268 * Note whether this is one of the specific variables we were told through
269 * the -E flag to use environment-variable-override for.
271 if (Lst_Find(&envFirstVars, name, (CompareProc *)strcmp) != NULL) {
272 localCheckEnvFirst = TRUE;
274 localCheckEnvFirst = FALSE;
278 * First look for the variable in the given context. If it's not there,
279 * look for it in VAR_CMD, VAR_GLOBAL and the environment, in that order,
280 * depending on the FIND_* flags in 'flags'
282 var = Lst_Find(&ctxt->context, name, VarCmp);
284 if ((var == NULL) && (flags & FIND_CMD) && (ctxt != VAR_CMD)) {
285 var = Lst_Find(&VAR_CMD->context, name, VarCmp);
287 if ((var == NULL) && (flags & FIND_GLOBAL) && (ctxt != VAR_GLOBAL) &&
288 !checkEnvFirst && !localCheckEnvFirst)
290 var = Lst_Find(&VAR_GLOBAL->context, name, VarCmp);
292 if ((var == NULL) && (flags & FIND_ENV)) {
295 if ((env = getenv(name)) != NULL) {
296 v = VarCreate(name, env, VAR_FROM_ENV);
299 } else if ((checkEnvFirst || localCheckEnvFirst) &&
300 (flags & FIND_GLOBAL) && (ctxt != VAR_GLOBAL))
302 var = Lst_Find(&VAR_GLOBAL->context, name, VarCmp);
311 return (Lst_Datum(var));
316 *-----------------------------------------------------------------------
318 * Add a new variable of name name and value val to the given context.
324 * The new variable is placed at the front of the given context
325 * The name and val arguments are duplicated so they may
327 *-----------------------------------------------------------------------
330 VarAdd(const char *name, const char *val, GNode *ctxt)
332 Lst_AtFront(&ctxt->context, VarCreate(name, val, 0));
334 DEBUGF(VAR, ("%s:%s = %s\n", ctxt->name, name, val));
338 * Create a Var object.
340 * @param name Name of variable.
341 * @param value Value of variable.
342 * @param flags Flags set on variable.
345 VarCreate(const char name[], const char value[], int flags)
349 v = emalloc(sizeof(Var));
350 v->name = estrdup(name);
351 v->val = Buf_Init(0);
355 Buf_Append(v->val, value);
361 * Destroy a Var object.
363 * @param v Object to destroy.
364 * @param f true if internal buffer in Buffer object is to be
368 VarDestroy(Var *v, Boolean f)
370 Buf_Destroy(v->val, f);
376 *-----------------------------------------------------------------------
378 * Remove a variable from a context.
384 * The Var structure is removed and freed.
386 *-----------------------------------------------------------------------
389 Var_Delete(const char *name, GNode *ctxt)
393 DEBUGF(VAR, ("%s:delete %s\n", ctxt->name, name));
394 ln = Lst_Find(&ctxt->context, name, VarCmp);
396 VarDestroy(Lst_Datum(ln), TRUE);
397 Lst_Remove(&ctxt->context, ln);
402 *-----------------------------------------------------------------------
404 * Set the variable name to the value val in the given context.
410 * If the variable doesn't yet exist, a new record is created for it.
411 * Else the old value is freed and the new one stuck in its place
414 * The variable is searched for only in its context before being
415 * created in that context. I.e. if the context is VAR_GLOBAL,
416 * only VAR_GLOBAL->context is searched. Likewise if it is VAR_CMD, only
417 * VAR_CMD->context is searched. This is done to avoid the literally
418 * thousands of unnecessary strcmp's that used to be done to
419 * set, say, $(@) or $(<).
420 *-----------------------------------------------------------------------
423 Var_Set(const char *name, const char *val, GNode *ctxt)
429 * We only look for a variable in the given context since anything set
430 * here will override anything in a lower context, so there's not much
431 * point in searching them all just to save a bit of memory...
433 n = VarPossiblyExpand(name, ctxt);
434 v = VarFind(n, ctxt, 0);
436 VarAdd(n, val, ctxt);
439 Buf_Append(v->val, val);
441 DEBUGF(VAR, ("%s:%s = %s\n", ctxt->name, n, val));
444 * Any variables given on the command line are automatically exported
445 * to the environment (as per POSIX standard)
447 if (ctxt == VAR_CMD || (v != (Var *)NULL && (v->flags & VAR_TO_ENV))) {
455 * Set the VAR_TO_ENV flag on a variable
458 Var_SetEnv(const char *name, GNode *ctxt)
462 v = VarFind(name, ctxt, FIND_CMD|FIND_GLOBAL|FIND_ENV);
464 if ((v->flags & VAR_TO_ENV) == 0) {
465 v->flags |= VAR_TO_ENV;
466 setenv(v->name, Buf_GetAll(v->val, NULL), 1);
469 Error("Cannot set environment flag on non-existant variable %s", name);
474 *-----------------------------------------------------------------------
476 * The variable of the given name has the given value appended to it in
483 * If the variable doesn't exist, it is created. Else the strings
484 * are concatenated (with a space in between).
487 * Only if the variable is being sought in the global context is the
488 * environment searched.
489 * XXX: Knows its calling circumstances in that if called with ctxt
490 * an actual target, it will only search that context since only
491 * a local variable could be being appended to. This is actually
492 * a big win and must be tolerated.
493 *-----------------------------------------------------------------------
496 Var_Append(const char *name, const char *val, GNode *ctxt)
501 n = VarPossiblyExpand(name, ctxt);
502 v = VarFind(n, ctxt, (ctxt == VAR_GLOBAL) ? FIND_ENV : 0);
505 VarAdd(n, val, ctxt);
507 Buf_AddByte(v->val, (Byte)' ');
508 Buf_Append(v->val, val);
510 DEBUGF(VAR, ("%s:%s = %s\n", ctxt->name, n,
511 (char *)Buf_GetAll(v->val, (size_t *)NULL)));
513 if (v->flags & VAR_FROM_ENV) {
515 * If the original variable came from the environment, we
516 * have to install it in the global context (we could place
517 * it in the environment, but then we should provide a way to
518 * export other variables...)
520 v->flags &= ~VAR_FROM_ENV;
521 Lst_AtFront(&ctxt->context, v);
528 *-----------------------------------------------------------------------
530 * See if the given variable exists.
533 * TRUE if it does, FALSE if it doesn't
538 *-----------------------------------------------------------------------
541 Var_Exists(const char *name, GNode *ctxt)
546 n = VarPossiblyExpand(name, ctxt);
547 v = VarFind(n, ctxt, FIND_CMD|FIND_GLOBAL|FIND_ENV);
552 } else if (v->flags & VAR_FROM_ENV) {
559 *-----------------------------------------------------------------------
561 * Return the value of the named variable in the given context
564 * The value if the variable exists, NULL if it doesn't
568 *-----------------------------------------------------------------------
571 Var_Value(const char *name, GNode *ctxt, char **frp)
576 n = VarPossiblyExpand(name, ctxt);
577 v = VarFind(n, ctxt, FIND_ENV | FIND_GLOBAL | FIND_CMD);
581 char *p = (char *)Buf_GetAll(v->val, (size_t *)NULL);
583 if (v->flags & VAR_FROM_ENV) {
584 VarDestroy(v, FALSE);
594 *-----------------------------------------------------------------------
596 * Modify each of the words of the passed string using the given
597 * function. Used to implement all modifiers.
600 * A string of all the words modified appropriately.
605 *-----------------------------------------------------------------------
608 VarModify(char *str, VarModifyProc *modProc, void *datum)
610 Buffer *buf; /* Buffer for the new string */
611 Boolean addSpace; /* TRUE if need to add a space to the
612 * buffer before adding the trimmed
614 char **av; /* word list [first word does not count] */
620 av = brk_string(str, &ac, FALSE);
622 for (i = 1; i < ac; i++)
623 addSpace = (*modProc)(av[i], addSpace, buf, datum);
625 Buf_AddByte(buf, '\0');
626 str = (char *)Buf_GetAll(buf, (size_t *)NULL);
627 Buf_Destroy(buf, FALSE);
632 *-----------------------------------------------------------------------
634 * Sort the words in the string.
637 * str String whose words should be sorted
638 * cmp A comparison function to control the ordering
641 * A string containing the words sorted
646 *-----------------------------------------------------------------------
649 VarSortWords(char *str, int (*cmp)(const void *, const void *))
656 av = brk_string(str, &ac, FALSE);
657 qsort(av + 1, ac - 1, sizeof(char *), cmp);
658 for (i = 1; i < ac; i++) {
659 Buf_Append(buf, av[i]);
660 Buf_AddByte(buf, (Byte)((i < ac - 1) ? ' ' : '\0'));
662 str = (char *)Buf_GetAll(buf, (size_t *)NULL);
663 Buf_Destroy(buf, FALSE);
668 SortIncreasing(const void *l, const void *r)
671 return (strcmp(*(const char* const*)l, *(const char* const*)r));
675 *-----------------------------------------------------------------------
677 * Pass through the tstr looking for 1) escaped delimiters,
678 * '$'s and backslashes (place the escaped character in
679 * uninterpreted) and 2) unescaped $'s that aren't before
680 * the delimiter (expand the variable substitution unless flags
681 * has VAR_NOSUBST set).
682 * Return the expanded string or NULL if the delimiter was missing
683 * If pattern is specified, handle escaped ampersands, and replace
684 * unescaped ampersands with the lhs of the pattern.
687 * A string of all the words modified appropriately.
688 * If length is specified, return the string length of the buffer
689 * If flags is specified and the last character of the pattern is a
690 * $ set the VAR_MATCH_END bit of flags.
694 *-----------------------------------------------------------------------
697 VarGetPattern(GNode *ctxt, int err, char **tstr, int delim, int *flags,
698 size_t *length, VarPattern *pattern)
701 Buffer *buf = Buf_Init(0);
707 #define IS_A_MATCH(cp, delim) \
708 ((cp[0] == '\\') && ((cp[1] == delim) || \
709 (cp[1] == '\\') || (cp[1] == '$') || (pattern && (cp[1] == '&'))))
712 * Skim through until the matching delimiter is found;
713 * pick up variable substitutions on the way. Also allow
714 * backslashes to quote the delimiter, $, and \, but don't
715 * touch other backslashes.
717 for (cp = *tstr; *cp && (*cp != delim); cp++) {
718 if (IS_A_MATCH(cp, delim)) {
719 Buf_AddByte(buf, (Byte)cp[1]);
721 } else if (*cp == '$') {
722 if (cp[1] == delim) {
724 Buf_AddByte(buf, (Byte)*cp);
727 * Unescaped $ at end of pattern => anchor
730 *flags |= VAR_MATCH_END;
732 if (flags == NULL || (*flags & VAR_NOSUBST) == 0) {
738 * If unescaped dollar sign not before the
739 * delimiter, assume it's a variable
740 * substitution and recurse.
742 cp2 = Var_Parse(cp, ctxt, err, &len, &freeIt);
743 Buf_Append(buf, cp2);
750 if (*cp2 == OPEN_PAREN || *cp2 == OPEN_BRACKET) {
752 * Find the end of this variable reference
753 * and suck it in without further ado.
754 * It will be interperated later.
757 int want = (*cp2 == OPEN_PAREN) ? CLOSE_PAREN : CLOSE_BRACKET;
760 for (++cp2; *cp2 != '\0' && depth > 0; ++cp2) {
761 if (cp2[-1] != '\\') {
768 Buf_AppendRange(buf, cp, cp2);
771 Buf_AddByte(buf, (Byte)*cp);
775 else if (pattern && *cp == '&')
776 Buf_AddBytes(buf, pattern->leftLen, (Byte *)pattern->lhs);
778 Buf_AddByte(buf, (Byte)*cp);
781 Buf_AddByte(buf, (Byte)'\0');
789 cp = (char *)Buf_GetAll(buf, length);
790 *length -= 1; /* Don't count the NULL */
791 Buf_Destroy(buf, FALSE);
797 *-----------------------------------------------------------------------
799 * Quote shell meta-characters in the string
807 *-----------------------------------------------------------------------
810 Var_Quote(const char *str)
813 /* This should cover most shells :-( */
814 static char meta[] = "\n \t'`\";&<>()|*?{}[]\\$!#^~";
817 buf = Buf_Init(MAKE_BSIZE);
818 for (; *str; str++) {
819 if (strchr(meta, *str) != NULL)
820 Buf_AddByte(buf, (Byte)'\\');
821 Buf_AddByte(buf, (Byte)*str);
823 Buf_AddByte(buf, (Byte)'\0');
824 ret = Buf_GetAll(buf, NULL);
825 Buf_Destroy(buf, FALSE);
830 *-----------------------------------------------------------------------
832 * Print the error caused by a regcomp or regexec call.
838 * An error gets printed.
840 *-----------------------------------------------------------------------
843 VarREError(int err, regex_t *pat, const char *str)
848 errlen = regerror(err, pat, 0, 0);
849 errbuf = emalloc(errlen);
850 regerror(err, pat, errbuf, errlen);
851 Error("%s: %s", str, errbuf);
856 *-----------------------------------------------------------------------
858 * Given the start of a variable invocation, extract the variable
859 * name and find its value, then modify it according to the
863 * The (possibly-modified) value of the variable or var_Error if the
864 * specification is invalid. The length of the specification is
865 * placed in *lengthPtr (for invalid specifications, this is just
866 * 2 to skip the '$' and the following letter, or 1 if '$' was the
867 * last character in the string).
868 * A Boolean in *freePtr telling whether the returned string should
869 * be freed by the caller.
874 *-----------------------------------------------------------------------
877 Var_Parse(char *str, GNode *ctxt, Boolean err, size_t *lengthPtr,
880 char *tstr; /* Pointer into str */
881 Var *v; /* Variable in invocation */
882 char *cp; /* Secondary pointer into str (place marker
884 Boolean haveModifier;/* TRUE if have modifiers for the variable */
885 char endc; /* Ending character when variable in parens
887 char startc=0; /* Starting character when variable in parens
891 Boolean dynamic; /* TRUE if the variable is local and we're
892 * expanding it in a non-local context. This
893 * is done to support dynamic sources. The
894 * result is just the invocation, unaltered */
895 int vlen; /* length of variable name, after embedded variable
903 * It is assumed that Var_Parse() is called with str[0] == '$'
906 if (str[1] == OPEN_PAREN || str[1] == OPEN_BRACKET) {
907 /* build up expanded variable name in this buffer */
908 Buffer *buf = Buf_Init(MAKE_BSIZE);
911 * Skip to the end character or a colon, whichever comes first,
912 * replacing embedded variables as we go.
915 endc = (startc == OPEN_PAREN) ? CLOSE_PAREN : CLOSE_BRACKET;
918 while (*tstr != '\0' && *tstr != endc && *tstr != ':') {
924 rval = Var_Parse(tstr, ctxt, err, &rlen, &rfree);
925 if (rval == var_Error) {
926 Fatal("Error expanding embedded variable.");
927 } else if (rval != NULL) {
928 Buf_Append(buf, rval);
934 Buf_AddByte(buf, (Byte)*tstr);
941 * If we never did find the end character, return NULL
942 * right now, setting the length to be the distance to
943 * the end of the string, since that's what make does.
945 *lengthPtr = tstr - str;
949 haveModifier = (*tstr == ':');
950 *tstr = '\0'; /* modify input string */
952 Buf_AddByte(buf, (Byte)'\0');
953 str = Buf_GetAll(buf, (size_t *)NULL);
956 v = VarFind(str, ctxt, FIND_ENV | FIND_GLOBAL | FIND_CMD);
957 if ((v == (Var *)NULL) && (ctxt != VAR_CMD) && (ctxt != VAR_GLOBAL) &&
958 (vlen == 2) && (str[1] == 'F' || str[1] == 'D'))
961 * Check for bogus D and F forms of local variables since we're
962 * in a local context and the name is the right length.
976 * Well, it's local -- go look for it.
980 v = VarFind(vname, ctxt, 0);
982 if (v != NULL && !haveModifier) {
984 * No need for nested expansion or anything, as we're
985 * the only one who sets these things and we sure don't
986 * put nested invocations in them...
988 val = (char *)Buf_GetAll(v->val, (size_t *)NULL);
991 val = VarModify(val, VarHead, (void *)NULL);
993 val = VarModify(val, VarTail, (void *)NULL);
996 * Resulting string is dynamically allocated, so
997 * tell caller to free it.
1000 *lengthPtr = tstr-start+1;
1002 Buf_Destroy(buf, TRUE);
1012 if (v == (Var *)NULL) {
1014 (((vlen == 2) && (str[1] == 'F' || str[1] == 'D')))) &&
1015 ((ctxt == VAR_CMD) || (ctxt == VAR_GLOBAL)))
1018 * If substituting a local variable in a non-local context,
1019 * assume it's for dynamic source stuff. We have to handle
1020 * this specially and return the longhand for the variable
1021 * with the dollar sign escaped so it makes it back to the
1022 * caller. Only four of the local variables are treated
1023 * specially as they are the only four that will be set
1024 * when dynamic sources are expanded.
1036 } else if ((vlen > 2) && (str[0] == '.') &&
1037 isupper((unsigned char)str[1]) &&
1038 ((ctxt == VAR_CMD) || (ctxt == VAR_GLOBAL)))
1043 if ((strncmp(str, ".TARGET", len) == 0) ||
1044 (strncmp(str, ".ARCHIVE", len) == 0) ||
1045 (strncmp(str, ".PREFIX", len) == 0) ||
1046 (strncmp(str, ".MEMBER", len) == 0))
1054 * Still need to get to the end of the variable specification,
1055 * so kludge up a Var structure for the modifications
1057 v = VarCreate(str, NULL, VAR_JUNK);
1061 * No modifiers -- have specification length so we can return
1064 *lengthPtr = tstr - start + 1;
1067 str = emalloc(*lengthPtr + 1);
1068 strncpy(str, start, *lengthPtr);
1069 str[*lengthPtr] = '\0';
1071 Buf_Destroy(buf, TRUE);
1074 Buf_Destroy(buf, TRUE);
1075 return (err ? var_Error : varNoError);
1079 Buf_Destroy(buf, TRUE);
1081 } else if (str[1] == '\0') {
1083 * Error there is only a dollar sign!
1086 return (err ? var_Error : varNoError);
1090 * If it's not bounded by braces of some sort, life is much simpler.
1091 * We just need to check for the first character and return the
1092 * value if it exists.
1100 v = VarFind(name, ctxt, FIND_ENV | FIND_GLOBAL | FIND_CMD);
1102 if ((ctxt == VAR_CMD) || (ctxt == VAR_GLOBAL)) {
1104 * If substituting a local variable in a non-local context,
1105 * assume it's for dynamic source stuff. We have to handle
1106 * this specially and return the longhand for the variable
1107 * with the dollar sign escaped so it makes it back to the
1108 * caller. Only four of the local variables are treated
1109 * specially as they are the only four that will be set
1110 * when dynamic sources are expanded.
1112 /* XXX: It looks like $% and $! are reversed here */
1115 return ("$(.TARGET)");
1117 return ("$(.ARCHIVE)");
1119 return ("$(.PREFIX)");
1121 return ("$(.MEMBER)");
1123 return (err ? var_Error : varNoError);
1126 return (err ? var_Error : varNoError);
1129 haveModifier = FALSE;
1135 if (v->flags & VAR_IN_USE) {
1136 Fatal("Variable %s is recursive.", v->name);
1139 v->flags |= VAR_IN_USE;
1143 * Before doing any modification, we have to make sure the value
1144 * has been fully expanded. If it looks like recursion might be
1145 * necessary (there's a dollar sign somewhere in the variable's value)
1146 * we just call Var_Subst to do any other substitutions that are
1147 * necessary. Note that the value returned by Var_Subst will have
1148 * been dynamically-allocated, so it will need freeing when we
1151 str = (char *)Buf_GetAll(v->val, (size_t *)NULL);
1152 if (strchr(str, '$') != NULL) {
1155 buf = Var_Subst(NULL, str, ctxt, err);
1156 str = Buf_GetAll(buf, NULL);
1157 Buf_Destroy(buf, FALSE);
1162 v->flags &= ~VAR_IN_USE;
1165 * Now we need to apply any modifiers the user wants applied.
1167 * :M<pattern> words which match the given <pattern>.
1168 * <pattern> is of the standard file
1170 * :S<d><pat1><d><pat2><d>[g]
1171 * Substitute <pat2> for <pat1> in the value
1172 * :C<d><pat1><d><pat2><d>[g]
1173 * Substitute <pat2> for regex <pat1> in the value
1174 * :H Substitute the head of each word
1175 * :T Substitute the tail of each word
1176 * :E Substitute the extension (minus '.') of
1178 * :R Substitute the root of each word
1179 * (pathname minus the suffix).
1180 * :lhs=rhs Like :S, but the rhs goes to the end of
1182 * :U Converts variable to upper-case.
1183 * :L Converts variable to lower-case.
1185 if ((str != NULL) && haveModifier) {
1187 * Skip initial colon while putting it back.
1190 while (*tstr != endc) {
1191 char *newStr; /* New value to return */
1192 char termc; /* Character which terminated scan */
1194 DEBUGF(VAR, ("Applying :%c to \"%s\"\n", *tstr, str));
1205 *cp != '\0' && *cp != ':' && *cp != endc;
1208 if (*cp == '\\' && (cp[1] == ':' || cp[1] == endc)) {
1217 * Need to compress the \:'s out of the pattern, so
1218 * allocate enough room to hold the uncompressed
1219 * pattern (note that cp started at tstr+1, so
1220 * cp - tstr takes the null byte into account) and
1221 * compress the pattern into the space.
1223 pattern = emalloc(cp - tstr);
1224 for (cp2 = pattern, cp = tstr + 1;
1228 if ((*cp == '\\') &&
1229 (cp[1] == ':' || cp[1] == endc)) {
1238 if (*tstr == 'M' || *tstr == 'm') {
1239 newStr = VarModify(str, VarMatch, pattern);
1241 newStr = VarModify(str, VarNoMatch, pattern);
1252 Buffer *buf; /* Buffer for patterns */
1259 * If pattern begins with '^', it is anchored to the
1260 * start of the word -- skip over it and flag pattern.
1263 pattern.flags |= VAR_MATCH_START;
1270 * Pass through the lhs looking for 1) escaped delimiters,
1271 * '$'s and backslashes (place the escaped character in
1272 * uninterpreted) and 2) unescaped $'s that aren't before
1273 * the delimiter (expand the variable substitution).
1274 * The result is left in the Buffer buf.
1276 for (cp = tstr; *cp != '\0' && *cp != del; cp++) {
1277 if ((*cp == '\\') &&
1282 Buf_AddByte(buf, (Byte)cp[1]);
1284 } else if (*cp == '$') {
1287 * If unescaped dollar sign not before the
1288 * delimiter, assume it's a variable
1289 * substitution and recurse.
1295 cp2 = Var_Parse(cp, ctxt, err, &len, &freeIt);
1296 Buf_Append(buf, cp2);
1303 * Unescaped $ at end of pattern => anchor
1306 pattern.flags |= VAR_MATCH_END;
1309 Buf_AddByte(buf, (Byte)*cp);
1313 Buf_AddByte(buf, (Byte)'\0');
1316 * If lhs didn't end with the delimiter, complain and
1320 Fatal("Unclosed substitution for %s (%c missing)",
1325 * Fetch pattern and destroy buffer, but preserve the data
1326 * in it, since that's our lhs. Note that Buf_GetAll
1327 * will return the actual number of bytes, which includes
1328 * the null byte, so we have to decrement the length by
1331 pattern.lhs = (char *)Buf_GetAll(buf, &pattern.leftLen);
1333 Buf_Destroy(buf, FALSE);
1336 * Now comes the replacement string. Three things need to
1337 * be done here: 1) need to compress escaped delimiters and
1338 * ampersands and 2) need to replace unescaped ampersands
1339 * with the l.h.s. (since this isn't regexp, we can do
1340 * it right here) and 3) expand any variable substitutions.
1345 for (cp = tstr; *cp != '\0' && *cp != del; cp++) {
1346 if ((*cp == '\\') &&
1352 Buf_AddByte(buf, (Byte)cp[1]);
1354 } else if ((*cp == '$') && (cp[1] != del)) {
1359 cp2 = Var_Parse(cp, ctxt, err, &len, &freeIt);
1360 Buf_Append(buf, cp2);
1365 } else if (*cp == '&') {
1366 Buf_AddBytes(buf, pattern.leftLen,
1367 (Byte *)pattern.lhs);
1369 Buf_AddByte(buf, (Byte)*cp);
1373 Buf_AddByte(buf, (Byte)'\0');
1376 * If didn't end in delimiter character, complain
1379 Fatal("Unclosed substitution for %s (%c missing)",
1383 pattern.rhs = (char *)Buf_GetAll(buf, &pattern.rightLen);
1385 Buf_Destroy(buf, FALSE);
1388 * Check for global substitution. If 'g' after the final
1389 * delimiter, substitution is global and is marked that
1394 pattern.flags |= VAR_SUB_GLOBAL;
1399 * Global substitution of the empty string causes an
1400 * infinite number of matches, unless anchored by '^'
1401 * (start of string) or '$' (end of string). Catch the
1402 * infinite substitution here.
1403 * Note that flags can only contain the 3 bits we're
1404 * interested in so we don't have to mask unrelated
1405 * bits. We can test for equality.
1407 if (!pattern.leftLen && pattern.flags == VAR_SUB_GLOBAL)
1408 Fatal("Global substitution of the empty string");
1411 newStr = VarModify(str, VarSubstitute, &pattern);
1413 * Free the two strings.
1421 VarREPattern pattern;
1431 if ((re = VarGetPattern(ctxt, err, &cp, delim, NULL,
1432 NULL, NULL)) == NULL) {
1433 /* was: goto cleanup */
1434 *lengthPtr = cp - start + 1;
1438 Fatal("Unclosed substitution for %s (%c missing)",
1443 if ((pattern.replace = VarGetPattern(ctxt, err, &cp,
1444 delim, NULL, NULL, NULL)) == NULL){
1447 /* was: goto cleanup */
1448 *lengthPtr = cp - start + 1;
1452 Fatal("Unclosed substitution for %s (%c missing)",
1460 pattern.flags |= VAR_SUB_GLOBAL;
1463 pattern.flags |= VAR_SUB_ONE;
1473 error = regcomp(&pattern.re, re, REG_EXTENDED);
1476 *lengthPtr = cp - start + 1;
1477 VarREError(error, &pattern.re, "RE substitution error");
1478 free(pattern.replace);
1482 pattern.nsub = pattern.re.re_nsub + 1;
1483 if (pattern.nsub < 1)
1485 if (pattern.nsub > 10)
1487 pattern.matches = emalloc(pattern.nsub *
1488 sizeof(regmatch_t));
1489 newStr = VarModify(str, VarRESubstitute, &pattern);
1490 regfree(&pattern.re);
1491 free(pattern.replace);
1492 free(pattern.matches);
1496 if (tstr[1] == endc || tstr[1] == ':') {
1498 buf = Buf_Init(MAKE_BSIZE);
1499 for (cp = str; *cp ; cp++)
1500 Buf_AddByte(buf, (Byte)tolower(*cp));
1502 Buf_AddByte(buf, (Byte)'\0');
1503 newStr = (char *)Buf_GetAll(buf, (size_t *)NULL);
1504 Buf_Destroy(buf, FALSE);
1512 if (tstr[1] == endc || tstr[1] == ':') {
1513 newStr = VarSortWords(str, SortIncreasing);
1520 if (tstr[1] == endc || tstr[1] == ':') {
1521 newStr = Var_Quote(str);
1528 if (tstr[1] == endc || tstr[1] == ':') {
1529 newStr = VarModify(str, VarTail, (void *)NULL);
1536 if (tstr[1] == endc || tstr[1] == ':') {
1538 buf = Buf_Init(MAKE_BSIZE);
1539 for (cp = str; *cp ; cp++)
1540 Buf_AddByte(buf, (Byte)toupper(*cp));
1542 Buf_AddByte(buf, (Byte)'\0');
1543 newStr = (char *)Buf_GetAll(buf, (size_t *)NULL);
1544 Buf_Destroy(buf, FALSE);
1552 if (tstr[1] == endc || tstr[1] == ':') {
1553 newStr = VarModify(str, VarHead, (void *)NULL);
1560 if (tstr[1] == endc || tstr[1] == ':') {
1561 newStr = VarModify(str, VarSuffix, (void *)NULL);
1568 if (tstr[1] == endc || tstr[1] == ':') {
1569 newStr = VarModify(str, VarRoot, (void *)NULL);
1577 if (tstr[1] == 'h' && (tstr[2] == endc || tstr[2] == ':')) {
1581 buf = Cmd_Exec(str, &error);
1582 newStr = Buf_GetAll(buf, NULL);
1583 Buf_Destroy(buf, FALSE);
1597 * This can either be a bogus modifier or a System-V
1598 * substitution command.
1607 * First we make a pass through the string trying
1608 * to verify it is a SYSV-make-style translation:
1609 * it must be: <string1>=<string2>)
1613 while (*cp != '\0' && cnt) {
1616 /* continue looking for endc */
1618 else if (*cp == endc)
1620 else if (*cp == startc)
1625 if (*cp == endc && eqFound) {
1628 * Now we break this sucker into the lhs and
1629 * rhs. We must null terminate them of course.
1634 if ((pattern.lhs = VarGetPattern(ctxt,
1635 err, &cp, delim, &pattern.flags, &pattern.leftLen,
1637 /* was: goto cleanup */
1638 *lengthPtr = cp - start + 1;
1642 Fatal("Unclosed substitution for %s (%c missing)",
1648 if ((pattern.rhs = VarGetPattern(ctxt,
1649 err, &cp, delim, NULL, &pattern.rightLen,
1650 &pattern)) == NULL) {
1651 /* was: goto cleanup */
1652 *lengthPtr = cp - start + 1;
1656 Fatal("Unclosed substitution for %s (%c missing)",
1662 * SYSV modifications happen through the whole
1663 * string. Note the pattern is anchored at the end.
1667 newStr = VarModify(str, VarSYSVMatch, &pattern);
1676 Error("Unknown modifier '%c'\n", *tstr);
1678 *cp != ':' && *cp != endc && *cp != '\0';
1686 DEBUGF(VAR, ("Result is \"%s\"\n", newStr));
1692 if (str != var_Error) {
1697 if (termc == '\0') {
1698 Error("Unclosed variable specification for %s", v->name);
1699 } else if (termc == ':') {
1706 *lengthPtr = tstr - start + 1;
1708 *lengthPtr = tstr - start + 1;
1712 if (v->flags & VAR_FROM_ENV) {
1713 Boolean destroy = FALSE;
1715 if (str != (char *)Buf_GetAll(v->val, (size_t *)NULL)) {
1719 * Returning the value unmodified, so tell the caller to free
1724 VarDestroy(v, destroy);
1725 } else if (v->flags & VAR_JUNK) {
1727 * Perform any free'ing needed and set *freePtr to FALSE so the caller
1728 * doesn't try to free a static pointer.
1734 VarDestroy(v, TRUE);
1736 str = emalloc(*lengthPtr + 1);
1737 strncpy(str, start, *lengthPtr);
1738 str[*lengthPtr] = '\0';
1741 str = err ? var_Error : varNoError;
1748 *-----------------------------------------------------------------------
1750 * Substitute for all variables in the given string in the given context
1751 * If undefErr is TRUE, Parse_Error will be called when an undefined
1752 * variable is encountered.
1755 * The resulting string.
1758 * None. The old string must be freed by the caller
1759 *-----------------------------------------------------------------------
1762 Var_Subst(const char *var, const char *str, GNode *ctxt, Boolean undefErr)
1764 Boolean errorReported;
1765 Buffer *buf; /* Buffer for forming things */
1768 * Set TRUE if an error has already been reported to prevent a
1769 * plethora of messages when recursing.
1771 errorReported = FALSE;
1775 if (var == NULL && (str[0] == '$') && (str[1] == '$')) {
1777 * A dollar sign may be escaped either with another dollar sign.
1778 * In such a case, we skip over the escape character and store the
1779 * dollar sign into the buffer directly.
1781 Buf_AddByte(buf, (Byte)str[0]);
1784 } else if (str[0] == '$') {
1785 char *val; /* Value to substitute for a variable */
1786 size_t length; /* Length of the variable invocation */
1787 Boolean doFree; /* Set true if val should be freed */
1789 * Variable invocation.
1794 if (str[1] == OPEN_PAREN || str[1] == OPEN_BRACKET) {
1796 const char *p = str + 2;
1799 * Scan up to the end of the variable name.
1801 while (*p != '\0' &&
1803 *p != CLOSE_PAREN &&
1804 *p != CLOSE_BRACKET &&
1810 * A variable inside the variable. We cannot expand
1811 * the external variable yet, so we try again with
1815 Buf_AppendRange(buf, str, p);
1821 if (var[l] == '\0' && strncmp(var, str + 2, l) == 0) {
1825 * Not the variable we want to expand, scan
1826 * until the next variable
1828 while (*p != '$' && *p != '\0')
1831 Buf_AppendRange(buf, str, p);
1838 * Single letter variable name.
1840 if (var[1] == '\0' && var[0] == str[1]) {
1843 Buf_AddBytes(buf, 2, (const Byte *)str);
1854 val = Var_Parse(str, ctxt, undefErr, &length, &doFree);
1857 * When we come down here, val should either point to the
1858 * value of this variable, suitably modified, or be NULL.
1859 * Length should be the total length of the potential
1860 * variable invocation (from $ to end character...)
1862 if (val == var_Error || val == varNoError) {
1864 * If performing old-time variable substitution, skip over
1865 * the variable and continue with the substitution. Otherwise,
1866 * store the dollar sign and advance str so we continue with
1871 } else if (undefErr) {
1873 * If variable is undefined, complain and skip the
1874 * variable. The complaint will stop us from doing anything
1875 * when the file is parsed.
1877 if (!errorReported) {
1878 Parse_Error(PARSE_FATAL,
1879 "Undefined variable \"%.*s\"",length,str);
1882 errorReported = TRUE;
1884 Buf_AddByte(buf, (Byte)*str);
1889 * We've now got a variable structure to store in. But first,
1890 * advance the string pointer.
1895 * Copy all the characters from the variable value straight
1896 * into the new string.
1898 Buf_Append(buf, val);
1906 * Skip as many characters as possible -- either to the end of
1907 * the string or to the next dollar sign (variable invocation).
1909 const char *cp = str;
1913 } while (str[0] != '$' && str[0] != '\0');
1915 Buf_AppendRange(buf, cp, str);
1923 *-----------------------------------------------------------------------
1925 * Return the tail from each of a list of words. Used to set the
1926 * System V local variables.
1929 * The resulting string.
1934 *-----------------------------------------------------------------------
1937 Var_GetTail(char *file)
1940 return (VarModify(file, VarTail, (void *)NULL));
1944 *-----------------------------------------------------------------------
1946 * Find the leading components of a (list of) filename(s).
1947 * XXX: VarHead does not replace foo by ., as (sun) System V make
1951 * The leading components.
1956 *-----------------------------------------------------------------------
1959 Var_GetHead(char *file)
1962 return (VarModify(file, VarHead, (void *)NULL));
1966 *-----------------------------------------------------------------------
1968 * Initialize the module
1974 * The VAR_CMD and VAR_GLOBAL contexts are created
1975 *-----------------------------------------------------------------------
1981 VAR_GLOBAL = Targ_NewGN("Global");
1982 VAR_CMD = Targ_NewGN("Command");
1985 /****************** PRINT DEBUGGING INFO *****************/
1987 VarPrintVar(void *vp, void *dummy __unused)
1989 Var *v = (Var *) vp;
1991 printf("%-16s = %s\n", v->name, (char *)Buf_GetAll(v->val, (size_t *)NULL));
1996 *-----------------------------------------------------------------------
1998 * print all variables in a context
1999 *-----------------------------------------------------------------------
2002 Var_Dump(GNode *ctxt)
2005 Lst_ForEach(&ctxt->context, VarPrintVar, (void *)NULL);