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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20 * This product includes software developed by the University of
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28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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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 1.55 2005/02/01 22:05:36 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 $(*)
128 * The four contexts are searched in the reverse order from which they are
131 GNode *VAR_GLOBAL; /* variables from the makefile */
132 GNode *VAR_CMD; /* variables defined on the command-line */
134 #define FIND_CMD 0x1 /* look in VAR_CMD when searching */
135 #define FIND_GLOBAL 0x2 /* look in VAR_GLOBAL as well */
136 #define FIND_ENV 0x4 /* look in the environment also */
138 #define OPEN_PAREN '('
139 #define CLOSE_PAREN ')'
140 #define OPEN_BRACKET '{'
141 #define CLOSE_BRACKET '}'
143 static char *VarPossiblyExpand(const char *, GNode *);
144 static Var *VarFind(const char *, GNode *, int);
145 static void VarAdd(const char *, const char *, GNode *);
146 static Var *VarCreate(const char [], const char [], int);
147 static void VarDestroy(Var *, Boolean);
148 static char *VarGetPattern(GNode *, int, char **, int, int *, size_t *,
150 static char *VarModify(char *,
151 Boolean (*)(const char *, Boolean, Buffer *, void *),
153 static int VarPrintVar(void *, void *);
156 *-----------------------------------------------------------------------
158 * See if the given variable matches the named one. Called from
159 * Lst_Find when searching for a variable of a given name.
162 * 0 if they match. non-zero otherwise.
166 *-----------------------------------------------------------------------
169 VarCmp(const void *v, const void *name)
171 return (strcmp(name, ((const Var *)v)->name));
175 *-----------------------------------------------------------------------
176 * VarPossiblyExpand --
177 * Expand a variable name's embedded variables in the given context.
180 * The contents of name, possibly expanded.
181 *-----------------------------------------------------------------------
184 VarPossiblyExpand(const char *name, GNode *ctxt)
186 if (strchr(name, '$') != NULL) {
190 buf = Var_Subst(NULL, name, ctxt, 0);
191 str = Buf_GetAll(buf, NULL);
192 Buf_Destroy(buf, FALSE);
196 return(estrdup(name));
201 *-----------------------------------------------------------------------
203 * Find the given variable in the given context and any other contexts
207 * FIND_GLOBAL set means look in the VAR_GLOBAL context too
208 * FIND_CMD set means to look in the VAR_CMD context too
209 * FIND_ENV set means to look in the environment
212 * A pointer to the structure describing the desired variable or
213 * NULL if the variable does not exist.
217 *-----------------------------------------------------------------------
220 VarFind(const char *name, GNode *ctxt, int flags)
222 Boolean localCheckEnvFirst;
227 * If the variable name begins with a '.', it could very well be one of
228 * the local ones. We check the name against all the local variables
229 * and substitute the short version in for 'name' if it matches one of
232 if (name[0] == '.' && isupper((unsigned char)name[1]))
235 if (!strcmp(name, ".ALLSRC"))
237 if (!strcmp(name, ".ARCHIVE"))
241 if (!strcmp(name, ".IMPSRC"))
245 if (!strcmp(name, ".MEMBER"))
249 if (!strcmp(name, ".OODATE"))
253 if (!strcmp(name, ".PREFIX"))
257 if (!strcmp(name, ".TARGET"))
263 * Note whether this is one of the specific variables we were told through
264 * the -E flag to use environment-variable-override for.
266 if (Lst_Find(&envFirstVars, name, (CompareProc *)strcmp) != NULL) {
267 localCheckEnvFirst = TRUE;
269 localCheckEnvFirst = FALSE;
273 * First look for the variable in the given context. If it's not there,
274 * look for it in VAR_CMD, VAR_GLOBAL and the environment, in that order,
275 * depending on the FIND_* flags in 'flags'
277 var = Lst_Find(&ctxt->context, name, VarCmp);
279 if ((var == NULL) && (flags & FIND_CMD) && (ctxt != VAR_CMD)) {
280 var = Lst_Find(&VAR_CMD->context, name, VarCmp);
282 if ((var == NULL) && (flags & FIND_GLOBAL) && (ctxt != VAR_GLOBAL) &&
283 !checkEnvFirst && !localCheckEnvFirst)
285 var = Lst_Find(&VAR_GLOBAL->context, name, VarCmp);
287 if ((var == NULL) && (flags & FIND_ENV)) {
290 if ((env = getenv(name)) != NULL) {
291 v = VarCreate(name, env, VAR_FROM_ENV);
294 } else if ((checkEnvFirst || localCheckEnvFirst) &&
295 (flags & FIND_GLOBAL) && (ctxt != VAR_GLOBAL))
297 var = Lst_Find(&VAR_GLOBAL->context, name, VarCmp);
301 return (Lst_Datum(var));
306 } else if (var == NULL) {
309 return (Lst_Datum(var));
314 *-----------------------------------------------------------------------
316 * Add a new variable of name name and value val to the given context.
322 * The new variable is placed at the front of the given context
323 * The name and val arguments are duplicated so they may
325 *-----------------------------------------------------------------------
328 VarAdd(const char *name, const char *val, GNode *ctxt)
330 Lst_AtFront(&ctxt->context, VarCreate(name, val, 0));
332 DEBUGF(VAR, ("%s:%s = %s\n", ctxt->name, name, val));
336 * Create a Var object.
338 * @param name Name of variable.
339 * @param value Value of variable.
340 * @param flags Flags set on variable.
343 VarCreate(const char name[], const char value[], int flags)
347 v = emalloc(sizeof(Var));
348 v->name = estrdup(name);
349 v->val = Buf_Init(0);
353 Buf_Append(v->val, value);
359 * Destroy a Var object.
361 * @param v Object to destroy.
362 * @param f true if internal buffer in Buffer object is to be
366 VarDestroy(Var *v, Boolean f)
368 Buf_Destroy(v->val, f);
374 *-----------------------------------------------------------------------
376 * Remove a variable from a context.
382 * The Var structure is removed and freed.
384 *-----------------------------------------------------------------------
387 Var_Delete(char *name, GNode *ctxt)
391 DEBUGF(VAR, ("%s:delete %s\n", ctxt->name, name));
392 ln = Lst_Find(&ctxt->context, name, VarCmp);
394 VarDestroy(Lst_Datum(ln), TRUE);
395 Lst_Remove(&ctxt->context, ln);
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(const char *name, const char *val, GNode *ctxt)
427 * We only look for a variable in the given context since anything set
428 * here will override anything in a lower context, so there's not much
429 * point in searching them all just to save a bit of memory...
431 n = VarPossiblyExpand(name, ctxt);
432 v = VarFind(n, ctxt, 0);
434 VarAdd(n, val, ctxt);
437 Buf_Append(v->val, val);
439 DEBUGF(VAR, ("%s:%s = %s\n", ctxt->name, n, val));
442 * Any variables given on the command line are automatically exported
443 * to the environment (as per POSIX standard)
445 if (ctxt == VAR_CMD || (v != (Var *)NULL && (v->flags & VAR_TO_ENV))) {
453 * Set the VAR_TO_ENV flag on a variable
456 Var_SetEnv(const char *name, GNode *ctxt)
460 v = VarFind(name, ctxt, FIND_CMD|FIND_GLOBAL|FIND_ENV);
462 if ((v->flags & VAR_TO_ENV) == 0) {
463 v->flags |= VAR_TO_ENV;
464 setenv(v->name, Buf_GetAll(v->val, NULL), 1);
467 Error("Cannot set environment flag on non-existant variable %s", name);
472 *-----------------------------------------------------------------------
474 * The variable of the given name has the given value appended to it in
481 * If the variable doesn't exist, it is created. Else the strings
482 * are concatenated (with a space in between).
485 * Only if the variable is being sought in the global context is the
486 * environment searched.
487 * XXX: Knows its calling circumstances in that if called with ctxt
488 * an actual target, it will only search that context since only
489 * a local variable could be being appended to. This is actually
490 * a big win and must be tolerated.
491 *-----------------------------------------------------------------------
494 Var_Append(const char *name, const char *val, GNode *ctxt)
499 n = VarPossiblyExpand(name, ctxt);
500 v = VarFind(n, ctxt, (ctxt == VAR_GLOBAL) ? FIND_ENV : 0);
502 VarAdd(n, val, ctxt);
504 Buf_AddByte(v->val, (Byte)' ');
505 Buf_Append(v->val, val);
507 DEBUGF(VAR, ("%s:%s = %s\n", ctxt->name, n,
508 (char *)Buf_GetAll(v->val, (size_t *)NULL)));
510 if (v->flags & VAR_FROM_ENV) {
512 * If the original variable came from the environment, we
513 * have to install it in the global context (we could place
514 * it in the environment, but then we should provide a way to
515 * export other variables...)
517 v->flags &= ~VAR_FROM_ENV;
518 Lst_AtFront(&ctxt->context, v);
525 *-----------------------------------------------------------------------
527 * See if the given variable exists.
530 * TRUE if it does, FALSE if it doesn't
535 *-----------------------------------------------------------------------
538 Var_Exists(const char *name, GNode *ctxt)
543 n = VarPossiblyExpand(name, ctxt);
544 v = VarFind(n, ctxt, FIND_CMD|FIND_GLOBAL|FIND_ENV);
549 } else if (v->flags & VAR_FROM_ENV) {
556 *-----------------------------------------------------------------------
558 * Return the value of the named variable in the given context
561 * The value if the variable exists, NULL if it doesn't
565 *-----------------------------------------------------------------------
568 Var_Value(const char *name, GNode *ctxt, char **frp)
573 n = VarPossiblyExpand(name, ctxt);
574 v = VarFind(n, ctxt, FIND_ENV | FIND_GLOBAL | FIND_CMD);
578 char *p = (char *)Buf_GetAll(v->val, (size_t *)NULL);
580 if (v->flags & VAR_FROM_ENV) {
581 VarDestroy(v, FALSE);
591 *-----------------------------------------------------------------------
593 * Modify each of the words of the passed string using the given
594 * function. Used to implement all modifiers.
597 * A string of all the words modified appropriately.
602 *-----------------------------------------------------------------------
605 VarModify(char *str, Boolean (*modProc)(const char *, Boolean, Buffer *, void *), void *datum)
607 Buffer *buf; /* Buffer for the new string */
608 Boolean addSpace; /* TRUE if need to add a space to the
609 * buffer before adding the trimmed
611 char **av; /* word list [first word does not count] */
617 av = brk_string(str, &ac, FALSE);
619 for (i = 1; i < ac; i++)
620 addSpace = (*modProc)(av[i], addSpace, buf, datum);
622 Buf_AddByte(buf, '\0');
623 str = (char *)Buf_GetAll(buf, (size_t *)NULL);
624 Buf_Destroy(buf, FALSE);
629 *-----------------------------------------------------------------------
631 * Sort the words in the string.
634 * str String whose words should be sorted
635 * cmp A comparison function to control the ordering
638 * A string containing the words sorted
643 *-----------------------------------------------------------------------
646 VarSortWords(char *str, int (*cmp)(const void *, const void *))
653 av = brk_string(str, &ac, FALSE);
654 qsort(av + 1, ac - 1, sizeof(char *), cmp);
655 for (i = 1; i < ac; i++) {
656 Buf_Append(buf, av[i]);
657 Buf_AddByte(buf, (Byte)((i < ac - 1) ? ' ' : '\0'));
659 str = (char *)Buf_GetAll(buf, (size_t *)NULL);
660 Buf_Destroy(buf, FALSE);
665 SortIncreasing(const void *l, const void *r)
667 return (strcmp(*(const char* const*)l, *(const char* const*)r));
671 *-----------------------------------------------------------------------
673 * Pass through the tstr looking for 1) escaped delimiters,
674 * '$'s and backslashes (place the escaped character in
675 * uninterpreted) and 2) unescaped $'s that aren't before
676 * the delimiter (expand the variable substitution unless flags
677 * has VAR_NOSUBST set).
678 * Return the expanded string or NULL if the delimiter was missing
679 * If pattern is specified, handle escaped ampersands, and replace
680 * unescaped ampersands with the lhs of the pattern.
683 * A string of all the words modified appropriately.
684 * If length is specified, return the string length of the buffer
685 * If flags is specified and the last character of the pattern is a
686 * $ set the VAR_MATCH_END bit of flags.
690 *-----------------------------------------------------------------------
693 VarGetPattern(GNode *ctxt, int err, char **tstr, int delim, int *flags,
694 size_t *length, VarPattern *pattern)
697 Buffer *buf = Buf_Init(0);
703 #define IS_A_MATCH(cp, delim) \
704 ((cp[0] == '\\') && ((cp[1] == delim) || \
705 (cp[1] == '\\') || (cp[1] == '$') || (pattern && (cp[1] == '&'))))
708 * Skim through until the matching delimiter is found;
709 * pick up variable substitutions on the way. Also allow
710 * backslashes to quote the delimiter, $, and \, but don't
711 * touch other backslashes.
713 for (cp = *tstr; *cp && (*cp != delim); cp++) {
714 if (IS_A_MATCH(cp, delim)) {
715 Buf_AddByte(buf, (Byte)cp[1]);
717 } else if (*cp == '$') {
718 if (cp[1] == delim) {
720 Buf_AddByte(buf, (Byte)*cp);
723 * Unescaped $ at end of pattern => anchor
726 *flags |= VAR_MATCH_END;
728 if (flags == NULL || (*flags & VAR_NOSUBST) == 0) {
734 * If unescaped dollar sign not before the
735 * delimiter, assume it's a variable
736 * substitution and recurse.
738 cp2 = Var_Parse(cp, ctxt, err, &len, &freeIt);
739 Buf_Append(buf, cp2);
746 if (*cp2 == OPEN_PAREN || *cp2 == OPEN_BRACKET) {
748 * Find the end of this variable reference
749 * and suck it in without further ado.
750 * It will be interperated later.
753 int want = (*cp2 == OPEN_PAREN) ? CLOSE_PAREN : CLOSE_BRACKET;
756 for (++cp2; *cp2 != '\0' && depth > 0; ++cp2) {
757 if (cp2[-1] != '\\') {
764 Buf_AppendRange(buf, cp, cp2);
767 Buf_AddByte(buf, (Byte)*cp);
771 else if (pattern && *cp == '&')
772 Buf_AddBytes(buf, pattern->leftLen, (Byte *)pattern->lhs);
774 Buf_AddByte(buf, (Byte)*cp);
777 Buf_AddByte(buf, (Byte)'\0');
785 cp = (char *)Buf_GetAll(buf, length);
786 *length -= 1; /* Don't count the NULL */
787 Buf_Destroy(buf, FALSE);
793 *-----------------------------------------------------------------------
795 * Quote shell meta-characters in the string
803 *-----------------------------------------------------------------------
806 Var_Quote(const char *str)
809 /* This should cover most shells :-( */
810 static char meta[] = "\n \t'`\";&<>()|*?{}[]\\$!#^~";
813 buf = Buf_Init(MAKE_BSIZE);
814 for (; *str; str++) {
815 if (strchr(meta, *str) != NULL)
816 Buf_AddByte(buf, (Byte)'\\');
817 Buf_AddByte(buf, (Byte)*str);
819 Buf_AddByte(buf, (Byte)'\0');
820 ret = Buf_GetAll(buf, NULL);
821 Buf_Destroy(buf, FALSE);
826 *-----------------------------------------------------------------------
828 * Print the error caused by a regcomp or regexec call.
834 * An error gets printed.
836 *-----------------------------------------------------------------------
839 VarREError(int err, regex_t *pat, const char *str)
844 errlen = regerror(err, pat, 0, 0);
845 errbuf = emalloc(errlen);
846 regerror(err, pat, errbuf, errlen);
847 Error("%s: %s", str, errbuf);
852 *-----------------------------------------------------------------------
854 * Given the start of a variable invocation, extract the variable
855 * name and find its value, then modify it according to the
859 * The (possibly-modified) value of the variable or var_Error if the
860 * specification is invalid. The length of the specification is
861 * placed in *lengthPtr (for invalid specifications, this is just
862 * 2 to skip the '$' and the following letter, or 1 if '$' was the
863 * last character in the string).
864 * A Boolean in *freePtr telling whether the returned string should
865 * be freed by the caller.
870 *-----------------------------------------------------------------------
873 Var_Parse(char *str, GNode *ctxt, Boolean err, size_t *lengthPtr, Boolean *freePtr)
875 char *tstr; /* Pointer into str */
876 Var *v; /* Variable in invocation */
877 char *cp; /* Secondary pointer into str (place marker
879 Boolean haveModifier;/* TRUE if have modifiers for the variable */
880 char endc; /* Ending character when variable in parens
882 char startc=0; /* Starting character when variable in parens
884 int cnt; /* Used to count brace pairs when variable in
885 * in parens or braces */
888 Boolean dynamic; /* TRUE if the variable is local and we're
889 * expanding it in a non-local context. This
890 * is done to support dynamic sources. The
891 * result is just the invocation, unaltered */
892 int vlen; /* length of variable name, after embedded variable
900 * It is assumed that Var_Parse() is called with str[0] == '$'
903 if (str[1] != OPEN_PAREN && str[1] != OPEN_BRACKET) {
905 * If it's not bounded by braces of some sort, life is much simpler.
906 * We just need to check for the first character and return the
907 * value if it exists.
914 v = VarFind(name, ctxt, FIND_ENV | FIND_GLOBAL | FIND_CMD);
915 if (v == (Var *)NULL) {
921 if ((ctxt == VAR_CMD) || (ctxt == VAR_GLOBAL)) {
923 * If substituting a local variable in a non-local context,
924 * assume it's for dynamic source stuff. We have to handle
925 * this specially and return the longhand for the variable
926 * with the dollar sign escaped so it makes it back to the
927 * caller. Only four of the local variables are treated
928 * specially as they are the only four that will be set
929 * when dynamic sources are expanded.
931 /* XXX: It looks like $% and $! are reversed here */
934 return ("$(.TARGET)");
936 return ("$(.ARCHIVE)");
938 return ("$(.PREFIX)");
940 return ("$(.MEMBER)");
948 return (err ? var_Error : varNoError);
950 haveModifier = FALSE;
955 /* build up expanded variable name in this buffer */
956 Buffer *buf = Buf_Init(MAKE_BSIZE);
959 * Skip to the end character or a colon, whichever comes first,
960 * replacing embedded variables as we go.
963 endc = (startc == OPEN_PAREN) ? CLOSE_PAREN : CLOSE_BRACKET;
966 while (*tstr != '\0' && *tstr != endc && *tstr != ':') {
972 rval = Var_Parse(tstr, ctxt, err, &rlen, &rfree);
973 if (rval == var_Error) {
974 Fatal("Error expanding embedded variable.");
975 } else if (rval != NULL) {
976 Buf_Append(buf, rval);
982 Buf_AddByte(buf, (Byte)*tstr);
989 * If we never did find the end character, return NULL
990 * right now, setting the length to be the distance to
991 * the end of the string, since that's what make does.
993 *lengthPtr = tstr - str;
997 haveModifier = (*tstr == ':');
998 *tstr = '\0'; /* modify input string */
1000 Buf_AddByte(buf, (Byte)'\0');
1001 str = Buf_GetAll(buf, (size_t *)NULL);
1004 v = VarFind(str, ctxt, FIND_ENV | FIND_GLOBAL | FIND_CMD);
1005 if ((v == (Var *)NULL) && (ctxt != VAR_CMD) && (ctxt != VAR_GLOBAL) &&
1006 (vlen == 2) && (str[1] == 'F' || str[1] == 'D'))
1009 * Check for bogus D and F forms of local variables since we're
1010 * in a local context and the name is the right length.
1024 * Well, it's local -- go look for it.
1028 v = VarFind(vname, ctxt, 0);
1030 if (v != NULL && !haveModifier) {
1032 * No need for nested expansion or anything, as we're
1033 * the only one who sets these things and we sure don't
1034 * put nested invocations in them...
1036 val = (char *)Buf_GetAll(v->val, (size_t *)NULL);
1038 if (str[1] == 'D') {
1039 val = VarModify(val, VarHead, (void *)NULL);
1041 val = VarModify(val, VarTail, (void *)NULL);
1044 * Resulting string is dynamically allocated, so
1045 * tell caller to free it.
1048 *lengthPtr = tstr-start+1;
1050 Buf_Destroy(buf, TRUE);
1060 if (v == (Var *)NULL) {
1062 (((vlen == 2) && (str[1] == 'F' || str[1] == 'D')))) &&
1063 ((ctxt == VAR_CMD) || (ctxt == VAR_GLOBAL)))
1066 * If substituting a local variable in a non-local context,
1067 * assume it's for dynamic source stuff. We have to handle
1068 * this specially and return the longhand for the variable
1069 * with the dollar sign escaped so it makes it back to the
1070 * caller. Only four of the local variables are treated
1071 * specially as they are the only four that will be set
1072 * when dynamic sources are expanded.
1084 } else if ((vlen > 2) && (str[0] == '.') &&
1085 isupper((unsigned char)str[1]) &&
1086 ((ctxt == VAR_CMD) || (ctxt == VAR_GLOBAL)))
1091 if ((strncmp(str, ".TARGET", len) == 0) ||
1092 (strncmp(str, ".ARCHIVE", len) == 0) ||
1093 (strncmp(str, ".PREFIX", len) == 0) ||
1094 (strncmp(str, ".MEMBER", len) == 0))
1100 if (!haveModifier) {
1102 * No modifiers -- have specification length so we can return
1105 *lengthPtr = tstr - start + 1;
1108 str = emalloc(*lengthPtr + 1);
1109 strncpy(str, start, *lengthPtr);
1110 str[*lengthPtr] = '\0';
1112 Buf_Destroy(buf, TRUE);
1115 Buf_Destroy(buf, TRUE);
1116 return (err ? var_Error : varNoError);
1120 * Still need to get to the end of the variable specification,
1121 * so kludge up a Var structure for the modifications
1123 v = VarCreate(str, NULL, VAR_JUNK);
1126 Buf_Destroy(buf, TRUE);
1129 if (v->flags & VAR_IN_USE) {
1130 Fatal("Variable %s is recursive.", v->name);
1133 v->flags |= VAR_IN_USE;
1137 * Before doing any modification, we have to make sure the value
1138 * has been fully expanded. If it looks like recursion might be
1139 * necessary (there's a dollar sign somewhere in the variable's value)
1140 * we just call Var_Subst to do any other substitutions that are
1141 * necessary. Note that the value returned by Var_Subst will have
1142 * been dynamically-allocated, so it will need freeing when we
1145 str = (char *)Buf_GetAll(v->val, (size_t *)NULL);
1146 if (strchr(str, '$') != NULL) {
1149 buf = Var_Subst(NULL, str, ctxt, err);
1150 str = Buf_GetAll(buf, NULL);
1151 Buf_Destroy(buf, FALSE);
1156 v->flags &= ~VAR_IN_USE;
1159 * Now we need to apply any modifiers the user wants applied.
1161 * :M<pattern> words which match the given <pattern>.
1162 * <pattern> is of the standard file
1164 * :S<d><pat1><d><pat2><d>[g]
1165 * Substitute <pat2> for <pat1> in the value
1166 * :C<d><pat1><d><pat2><d>[g]
1167 * Substitute <pat2> for regex <pat1> in the value
1168 * :H Substitute the head of each word
1169 * :T Substitute the tail of each word
1170 * :E Substitute the extension (minus '.') of
1172 * :R Substitute the root of each word
1173 * (pathname minus the suffix).
1174 * :lhs=rhs Like :S, but the rhs goes to the end of
1176 * :U Converts variable to upper-case.
1177 * :L Converts variable to lower-case.
1179 if ((str != NULL) && haveModifier) {
1181 * Skip initial colon while putting it back.
1184 while (*tstr != endc) {
1185 char *newStr; /* New value to return */
1186 char termc; /* Character which terminated scan */
1188 DEBUGF(VAR, ("Applying :%c to \"%s\"\n", *tstr, str));
1199 *cp != '\0' && *cp != ':' && *cp != endc;
1202 if (*cp == '\\' && (cp[1] == ':' || cp[1] == endc)) {
1211 * Need to compress the \:'s out of the pattern, so
1212 * allocate enough room to hold the uncompressed
1213 * pattern (note that cp started at tstr+1, so
1214 * cp - tstr takes the null byte into account) and
1215 * compress the pattern into the space.
1217 pattern = emalloc(cp - tstr);
1218 for (cp2 = pattern, cp = tstr + 1;
1222 if ((*cp == '\\') &&
1223 (cp[1] == ':' || cp[1] == endc)) {
1232 if (*tstr == 'M' || *tstr == 'm') {
1233 newStr = VarModify(str, VarMatch, pattern);
1235 newStr = VarModify(str, VarNoMatch, pattern);
1246 Buffer *buf; /* Buffer for patterns */
1253 * If pattern begins with '^', it is anchored to the
1254 * start of the word -- skip over it and flag pattern.
1257 pattern.flags |= VAR_MATCH_START;
1264 * Pass through the lhs looking for 1) escaped delimiters,
1265 * '$'s and backslashes (place the escaped character in
1266 * uninterpreted) and 2) unescaped $'s that aren't before
1267 * the delimiter (expand the variable substitution).
1268 * The result is left in the Buffer buf.
1270 for (cp = tstr; *cp != '\0' && *cp != del; cp++) {
1271 if ((*cp == '\\') &&
1276 Buf_AddByte(buf, (Byte)cp[1]);
1278 } else if (*cp == '$') {
1281 * If unescaped dollar sign not before the
1282 * delimiter, assume it's a variable
1283 * substitution and recurse.
1289 cp2 = Var_Parse(cp, ctxt, err, &len, &freeIt);
1290 Buf_Append(buf, cp2);
1297 * Unescaped $ at end of pattern => anchor
1300 pattern.flags |= VAR_MATCH_END;
1303 Buf_AddByte(buf, (Byte)*cp);
1307 Buf_AddByte(buf, (Byte)'\0');
1310 * If lhs didn't end with the delimiter, complain and
1314 Fatal("Unclosed substitution for %s (%c missing)",
1319 * Fetch pattern and destroy buffer, but preserve the data
1320 * in it, since that's our lhs. Note that Buf_GetAll
1321 * will return the actual number of bytes, which includes
1322 * the null byte, so we have to decrement the length by
1325 pattern.lhs = (char *)Buf_GetAll(buf, &pattern.leftLen);
1327 Buf_Destroy(buf, FALSE);
1330 * Now comes the replacement string. Three things need to
1331 * be done here: 1) need to compress escaped delimiters and
1332 * ampersands and 2) need to replace unescaped ampersands
1333 * with the l.h.s. (since this isn't regexp, we can do
1334 * it right here) and 3) expand any variable substitutions.
1339 for (cp = tstr; *cp != '\0' && *cp != del; cp++) {
1340 if ((*cp == '\\') &&
1346 Buf_AddByte(buf, (Byte)cp[1]);
1348 } else if ((*cp == '$') && (cp[1] != del)) {
1353 cp2 = Var_Parse(cp, ctxt, err, &len, &freeIt);
1354 Buf_Append(buf, cp2);
1359 } else if (*cp == '&') {
1360 Buf_AddBytes(buf, pattern.leftLen,
1361 (Byte *)pattern.lhs);
1363 Buf_AddByte(buf, (Byte)*cp);
1367 Buf_AddByte(buf, (Byte)'\0');
1370 * If didn't end in delimiter character, complain
1373 Fatal("Unclosed substitution for %s (%c missing)",
1377 pattern.rhs = (char *)Buf_GetAll(buf, &pattern.rightLen);
1379 Buf_Destroy(buf, FALSE);
1382 * Check for global substitution. If 'g' after the final
1383 * delimiter, substitution is global and is marked that
1388 pattern.flags |= VAR_SUB_GLOBAL;
1393 * Global substitution of the empty string causes an
1394 * infinite number of matches, unless anchored by '^'
1395 * (start of string) or '$' (end of string). Catch the
1396 * infinite substitution here.
1397 * Note that flags can only contain the 3 bits we're
1398 * interested in so we don't have to mask unrelated
1399 * bits. We can test for equality.
1401 if (!pattern.leftLen && pattern.flags == VAR_SUB_GLOBAL)
1402 Fatal("Global substitution of the empty string");
1405 newStr = VarModify(str, VarSubstitute, &pattern);
1407 * Free the two strings.
1415 VarREPattern pattern;
1425 if ((re = VarGetPattern(ctxt, err, &cp, delim, NULL,
1426 NULL, NULL)) == NULL) {
1427 /* was: goto cleanup */
1428 *lengthPtr = cp - start + 1;
1432 Fatal("Unclosed substitution for %s (%c missing)",
1437 if ((pattern.replace = VarGetPattern(ctxt, err, &cp,
1438 delim, NULL, NULL, NULL)) == NULL){
1441 /* was: goto cleanup */
1442 *lengthPtr = cp - start + 1;
1446 Fatal("Unclosed substitution for %s (%c missing)",
1454 pattern.flags |= VAR_SUB_GLOBAL;
1457 pattern.flags |= VAR_SUB_ONE;
1467 error = regcomp(&pattern.re, re, REG_EXTENDED);
1470 *lengthPtr = cp - start + 1;
1471 VarREError(error, &pattern.re, "RE substitution error");
1472 free(pattern.replace);
1476 pattern.nsub = pattern.re.re_nsub + 1;
1477 if (pattern.nsub < 1)
1479 if (pattern.nsub > 10)
1481 pattern.matches = emalloc(pattern.nsub *
1482 sizeof(regmatch_t));
1483 newStr = VarModify(str, VarRESubstitute, &pattern);
1484 regfree(&pattern.re);
1485 free(pattern.replace);
1486 free(pattern.matches);
1490 if (tstr[1] == endc || tstr[1] == ':') {
1492 buf = Buf_Init(MAKE_BSIZE);
1493 for (cp = str; *cp ; cp++)
1494 Buf_AddByte(buf, (Byte)tolower(*cp));
1496 Buf_AddByte(buf, (Byte)'\0');
1497 newStr = (char *)Buf_GetAll(buf, (size_t *)NULL);
1498 Buf_Destroy(buf, FALSE);
1506 if (tstr[1] == endc || tstr[1] == ':') {
1507 newStr = VarSortWords(str, SortIncreasing);
1514 if (tstr[1] == endc || tstr[1] == ':') {
1515 newStr = Var_Quote(str);
1522 if (tstr[1] == endc || tstr[1] == ':') {
1523 newStr = VarModify(str, VarTail, (void *)NULL);
1530 if (tstr[1] == endc || tstr[1] == ':') {
1532 buf = Buf_Init(MAKE_BSIZE);
1533 for (cp = str; *cp ; cp++)
1534 Buf_AddByte(buf, (Byte)toupper(*cp));
1536 Buf_AddByte(buf, (Byte)'\0');
1537 newStr = (char *)Buf_GetAll(buf, (size_t *)NULL);
1538 Buf_Destroy(buf, FALSE);
1546 if (tstr[1] == endc || tstr[1] == ':') {
1547 newStr = VarModify(str, VarHead, (void *)NULL);
1554 if (tstr[1] == endc || tstr[1] == ':') {
1555 newStr = VarModify(str, VarSuffix, (void *)NULL);
1562 if (tstr[1] == endc || tstr[1] == ':') {
1563 newStr = VarModify(str, VarRoot, (void *)NULL);
1571 if (tstr[1] == 'h' && (tstr[2] == endc || tstr[2] == ':')) {
1574 Buffer *buf = Cmd_Exec(str, &error);
1575 newStr = Buf_GetAll(buf, NULL);
1576 Buf_Destroy(buf, FALSE);
1590 * This can either be a bogus modifier or a System-V
1591 * substitution command.
1599 * First we make a pass through the string trying
1600 * to verify it is a SYSV-make-style translation:
1601 * it must be: <string1>=<string2>)
1605 while (*cp != '\0' && cnt) {
1608 /* continue looking for endc */
1610 else if (*cp == endc)
1612 else if (*cp == startc)
1617 if (*cp == endc && eqFound) {
1620 * Now we break this sucker into the lhs and
1621 * rhs. We must null terminate them of course.
1626 if ((pattern.lhs = VarGetPattern(ctxt,
1627 err, &cp, delim, &pattern.flags, &pattern.leftLen,
1629 /* was: goto cleanup */
1630 *lengthPtr = cp - start + 1;
1634 Fatal("Unclosed substitution for %s (%c missing)",
1640 if ((pattern.rhs = VarGetPattern(ctxt,
1641 err, &cp, delim, NULL, &pattern.rightLen,
1642 &pattern)) == NULL) {
1643 /* was: goto cleanup */
1644 *lengthPtr = cp - start + 1;
1648 Fatal("Unclosed substitution for %s (%c missing)",
1654 * SYSV modifications happen through the whole
1655 * string. Note the pattern is anchored at the end.
1659 newStr = VarModify(str, VarSYSVMatch, &pattern);
1668 Error("Unknown modifier '%c'\n", *tstr);
1670 *cp != ':' && *cp != endc && *cp != '\0';
1678 DEBUGF(VAR, ("Result is \"%s\"\n", newStr));
1684 if (str != var_Error) {
1689 if (termc == '\0') {
1690 Error("Unclosed variable specification for %s", v->name);
1691 } else if (termc == ':') {
1698 *lengthPtr = tstr - start + 1;
1700 *lengthPtr = tstr - start + 1;
1704 if (v->flags & VAR_FROM_ENV) {
1705 Boolean destroy = FALSE;
1707 if (str != (char *)Buf_GetAll(v->val, (size_t *)NULL)) {
1711 * Returning the value unmodified, so tell the caller to free
1716 VarDestroy(v, destroy);
1717 } else if (v->flags & VAR_JUNK) {
1719 * Perform any free'ing needed and set *freePtr to FALSE so the caller
1720 * doesn't try to free a static pointer.
1726 VarDestroy(v, TRUE);
1728 str = emalloc(*lengthPtr + 1);
1729 strncpy(str, start, *lengthPtr);
1730 str[*lengthPtr] = '\0';
1733 str = err ? var_Error : varNoError;
1740 *-----------------------------------------------------------------------
1742 * Substitute for all variables in the given string in the given context
1743 * If undefErr is TRUE, Parse_Error will be called when an undefined
1744 * variable is encountered.
1747 * The resulting string.
1750 * None. The old string must be freed by the caller
1751 *-----------------------------------------------------------------------
1754 Var_Subst(const char *var, const char *str, GNode *ctxt, Boolean undefErr)
1756 Boolean errorReported;
1757 Buffer *buf; /* Buffer for forming things */
1760 * Set TRUE if an error has already been reported to prevent a
1761 * plethora of messages when recursing.
1763 errorReported = FALSE;
1767 if (var == NULL && (str[0] == '$') && (str[1] == '$')) {
1769 * A dollar sign may be escaped either with another dollar sign.
1770 * In such a case, we skip over the escape character and store the
1771 * dollar sign into the buffer directly.
1773 Buf_AddByte(buf, (Byte)str[0]);
1776 } else if (str[0] == '$') {
1777 char *val; /* Value to substitute for a variable */
1778 size_t length; /* Length of the variable invocation */
1779 Boolean doFree; /* Set true if val should be freed */
1781 * Variable invocation.
1786 if (str[1] == OPEN_PAREN || str[1] == OPEN_BRACKET) {
1787 const char *p = str + 2;
1790 * Scan up to the end of the variable name.
1792 while (*p != '\0' &&
1794 *p != CLOSE_PAREN &&
1795 *p != CLOSE_BRACKET &&
1801 * A variable inside the variable. We cannot expand
1802 * the external variable yet, so we try again with
1806 Buf_AppendRange(buf, str, p);
1811 if (var[p - (str + 2)] == '\0' && strncmp(var, str + 2, p - (str + 2)) == 0) {
1815 * Not the variable we want to expand, scan
1816 * until the next variable
1818 while (*p != '$' && *p != '\0')
1821 Buf_AppendRange(buf, str, p);
1828 * Single letter variable name.
1830 if (var[1] == '\0' && str[1] == var[0]) {
1833 Buf_AddBytes(buf, 2, (const Byte *)str);
1844 val = Var_Parse(str, ctxt, undefErr, &length, &doFree);
1847 * When we come down here, val should either point to the
1848 * value of this variable, suitably modified, or be NULL.
1849 * Length should be the total length of the potential
1850 * variable invocation (from $ to end character...)
1852 if (val == var_Error || val == varNoError) {
1854 * If performing old-time variable substitution, skip over
1855 * the variable and continue with the substitution. Otherwise,
1856 * store the dollar sign and advance str so we continue with
1861 } else if (undefErr) {
1863 * If variable is undefined, complain and skip the
1864 * variable. The complaint will stop us from doing anything
1865 * when the file is parsed.
1867 if (!errorReported) {
1868 Parse_Error(PARSE_FATAL,
1869 "Undefined variable \"%.*s\"",length,str);
1872 errorReported = TRUE;
1874 Buf_AddByte(buf, (Byte)*str);
1879 * We've now got a variable structure to store in. But first,
1880 * advance the string pointer.
1885 * Copy all the characters from the variable value straight
1886 * into the new string.
1888 Buf_Append(buf, val);
1896 * Skip as many characters as possible -- either to the end of
1897 * the string or to the next dollar sign (variable invocation).
1899 const char *cp = str;
1903 } while (str[0] != '$' && str[0] != '\0');
1905 Buf_AppendRange(buf, cp, str);
1913 *-----------------------------------------------------------------------
1915 * Return the tail from each of a list of words. Used to set the
1916 * System V local variables.
1919 * The resulting string.
1924 *-----------------------------------------------------------------------
1927 Var_GetTail(char *file)
1929 return (VarModify(file, VarTail, (void *)NULL));
1933 *-----------------------------------------------------------------------
1935 * Find the leading components of a (list of) filename(s).
1936 * XXX: VarHead does not replace foo by ., as (sun) System V make
1940 * The leading components.
1945 *-----------------------------------------------------------------------
1948 Var_GetHead(char *file)
1951 return (VarModify(file, VarHead, (void *)NULL));
1955 *-----------------------------------------------------------------------
1957 * Initialize the module
1963 * The VAR_CMD and VAR_GLOBAL contexts are created
1964 *-----------------------------------------------------------------------
1969 VAR_GLOBAL = Targ_NewGN("Global");
1970 VAR_CMD = Targ_NewGN("Command");
1973 /****************** PRINT DEBUGGING INFO *****************/
1975 VarPrintVar(void *vp, void *dummy __unused)
1977 Var *v = (Var *) vp;
1979 printf("%-16s = %s\n", v->name, (char *)Buf_GetAll(v->val, (size_t *)NULL));
1984 *-----------------------------------------------------------------------
1986 * print all variables in a context
1987 *-----------------------------------------------------------------------
1990 Var_Dump(GNode *ctxt)
1992 Lst_ForEach(&ctxt->context, VarPrintVar, (void *)NULL);