2 * Copyright (c) 2002 Juli Mallett.
3 * Copyright (c) 1988, 1989, 1990, 1993
4 * The Regents of the University of California. All rights reserved.
5 * Copyright (c) 1989 by Berkeley Softworks
8 * This code is derived from software contributed to Berkeley by
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12 * modification, are permitted provided that the following conditions
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21 * This product includes software developed by the University of
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39 * @(#)var.c 8.3 (Berkeley) 3/19/94
40 * $FreeBSD: src/usr.bin/make/var.c,v 1.83 2005/02/11 10:49:01 harti Exp $
41 * $DragonFly: src/usr.bin/make/var.c,v 1.201 2005/04/22 16:01:03 okumoto Exp $
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.
90 #include <sys/types.h>
108 typedef struct VarParser {
109 const char *const input; /* pointer to input string */
110 const char *ptr; /* current parser pos in input str */
117 char *name; /* the variable's name */
118 struct Buffer *val; /* its value */
119 int flags; /* miscellaneous status flags */
121 #define VAR_IN_USE 1 /* Variable's value currently being used.
122 * Used to avoid recursion */
124 #define VAR_JUNK 4 /* Variable is a junk variable that
125 * should be destroyed when done with
126 * it. Used by Var_Parse for undefined,
127 * modified variables */
129 #define VAR_TO_ENV 8 /* Place variable in environment */
133 struct Buffer *lhs; /* String to match */
134 struct Buffer *rhs; /* Replacement string (w/ &'s removed) */
141 #define VAR_SUB_GLOBAL 0x01 /* Apply substitution globally */
142 #define VAR_SUB_ONE 0x02 /* Apply substitution to one word */
143 #define VAR_SUB_MATCHED 0x04 /* There was a match */
144 #define VAR_MATCH_START 0x08 /* Match at start of word */
145 #define VAR_MATCH_END 0x10 /* Match at end of word */
148 typedef Boolean VarModifyProc(const char *, Boolean, struct Buffer *, void *);
150 static char *VarParse(VarParser *, Boolean *);
153 * This is a harmless return value for Var_Parse that can be used by Var_Subst
154 * to determine if there was an error in parsing -- easier than returning
155 * a flag, as things outside this module don't give a hoot.
157 char var_Error[] = "";
160 * Similar to var_Error, but returned when the 'err' flag for Var_Parse is
161 * set false. Why not just use a constant? Well, gcc likes to condense
162 * identical string instances...
164 static char varNoError[] = "";
167 * Internally, variables are contained in four different contexts.
168 * 1) the environment. They may not be changed. If an environment
169 * variable is appended-to, the result is placed in the global
171 * 2) the global context. Variables set in the Makefile are located in
172 * the global context. It is the penultimate context searched when
174 * 3) the command-line context. All variables set on the command line
175 * are placed in this context. They are UNALTERABLE once placed here.
176 * 4) the local context. Each target has associated with it a context
177 * list. On this list are located the structures describing such
178 * local variables as $(@) and $(*)
179 * The four contexts are searched in the reverse order from which they are
182 GNode *VAR_ENV; /* variables from the environment */
183 GNode *VAR_GLOBAL; /* variables from the makefile */
184 GNode *VAR_CMD; /* variables defined on the command-line */
186 #define OPEN_PAREN '('
187 #define CLOSE_PAREN ')'
188 #define OPEN_BRACE '{'
189 #define CLOSE_BRACE '}'
192 * Create a Var object.
194 * @param name Name of variable.
195 * @param value Value of variable.
196 * @param flags Flags set on variable.
199 VarCreate(const char name[], const char value[], int flags)
203 v = emalloc(sizeof(Var));
204 v->name = estrdup(name);
205 v->val = Buf_Init(0);
209 Buf_Append(v->val, value);
215 * Destroy a Var object.
217 * @param v Object to destroy.
218 * @param f true if internal buffer in Buffer object is to be
222 VarDestroy(Var *v, Boolean f)
225 Buf_Destroy(v->val, f);
231 * Remove the tail of the given word and place the result in the given
235 * TRUE if characters were added to the buffer (a space needs to be
236 * added to the buffer before the next word).
239 * The trimmed word is added to the buffer.
242 VarHead(const char *word, Boolean addSpace, Buffer *buf, void *dummy __unused)
246 slash = strrchr(word, '/');
249 Buf_AddByte(buf, (Byte)' ');
251 Buf_AppendRange(buf, word, slash);
254 * If no directory part, give . (q.v. the POSIX standard)
257 Buf_Append(buf, " .");
259 Buf_AddByte(buf, (Byte)'.');
266 * Remove the head of the given word and place the result in the given
270 * TRUE if characters were added to the buffer (a space needs to be
271 * added to the buffer before the next word).
274 * The trimmed word is added to the buffer.
277 VarTail(const char *word, Boolean addSpace, Buffer *buf, void *dummy __unused)
282 Buf_AddByte (buf, (Byte)' ');
285 slash = strrchr(word, '/');
288 Buf_Append(buf, slash);
290 Buf_Append(buf, word);
296 * Place the suffix of the given word in the given buffer.
299 * TRUE if characters were added to the buffer (a space needs to be
300 * added to the buffer before the next word).
303 * The suffix from the word is placed in the buffer.
306 VarSuffix(const char *word, Boolean addSpace, Buffer *buf, void *dummy __unused)
310 dot = strrchr(word, '.');
313 Buf_AddByte(buf, (Byte)' ');
316 Buf_Append(buf, dot);
323 * Remove the suffix of the given word and place the result in the
327 * TRUE if characters were added to the buffer (a space needs to be
328 * added to the buffer before the next word).
331 * The trimmed word is added to the buffer.
334 VarRoot(const char *word, Boolean addSpace, Buffer *buf, void *dummy __unused)
339 Buf_AddByte(buf, (Byte)' ');
342 dot = strrchr(word, '.');
344 Buf_AppendRange(buf, word, dot);
346 Buf_Append(buf, word);
352 * Place the word in the buffer if it matches the given pattern.
353 * Callback function for VarModify to implement the :M modifier.
354 * A space will be added if requested. A pattern is supplied
355 * which the word must match.
358 * TRUE if a space should be placed in the buffer before the next
362 * The word may be copied to the buffer.
365 VarMatch(const char *word, Boolean addSpace, Buffer *buf, void *pattern)
368 if (Str_Match(word, pattern)) {
370 Buf_AddByte(buf, (Byte)' ');
373 Buf_Append(buf, word);
380 * Place the word in the buffer if it matches the given pattern.
381 * Callback function for VarModify to implement the System V %
382 * modifiers. A space is added if requested.
385 * TRUE if a space should be placed in the buffer before the next
389 * The word may be copied to the buffer.
392 VarSYSVMatch(const char *word, Boolean addSpace, Buffer *buf, void *patp)
396 VarPattern *pat = (VarPattern *)patp;
399 Buf_AddByte(buf, (Byte)' ');
403 if ((ptr = Str_SYSVMatch(word, Buf_Data(pat->lhs), &len)) != NULL)
404 Str_SYSVSubst(buf, Buf_Data(pat->rhs), ptr, len);
406 Buf_Append(buf, word);
413 * Place the word in the buffer if it doesn't match the given pattern.
414 * Callback function for VarModify to implement the :N modifier. A
415 * space is added if requested.
418 * TRUE if a space should be placed in the buffer before the next
422 * The word may be copied to the buffer.
425 VarNoMatch(const char *word, Boolean addSpace, Buffer *buf, void *pattern)
428 if (!Str_Match(word, pattern)) {
430 Buf_AddByte(buf, (Byte)' ');
433 Buf_Append(buf, word);
439 * Perform a string-substitution on the given word, placing the
440 * result in the passed buffer. A space is added if requested.
443 * TRUE if a space is needed before more characters are added.
446 VarSubstitute(const char *word, Boolean addSpace, Buffer *buf, void *patternp)
448 size_t wordLen; /* Length of word */
449 const char *cp; /* General pointer */
450 VarPattern *pattern = patternp;
452 wordLen = strlen(word);
453 if (1) { /* substitute in each word of the variable */
455 * Break substitution down into simple anchored cases
456 * and if none of them fits, perform the general substitution
459 if ((pattern->flags & VAR_MATCH_START) &&
460 (strncmp(word, Buf_Data(pattern->lhs),
461 Buf_Size(pattern->lhs)) == 0)) {
463 * Anchored at start and beginning of word matches
466 if ((pattern->flags & VAR_MATCH_END) &&
467 (wordLen == Buf_Size(pattern->lhs))) {
469 * Also anchored at end and matches to the end
470 * (word is same length as pattern) add space
471 * and rhs only if rhs is non-null.
473 if (Buf_Size(pattern->rhs) != 0) {
475 Buf_AddByte(buf, (Byte)' ');
478 Buf_AppendBuf(buf, pattern->rhs);
481 } else if (pattern->flags & VAR_MATCH_END) {
483 * Doesn't match to end -- copy word wholesale
489 * Matches at start but need to copy in
490 * trailing characters.
492 if ((Buf_Size(pattern->rhs) + wordLen -
493 Buf_Size(pattern->lhs)) != 0) {
495 Buf_AddByte(buf, (Byte)' ');
499 Buf_AppendBuf(buf, pattern->rhs);
500 Buf_AddBytes(buf, wordLen -
501 Buf_Size(pattern->lhs),
502 (word + Buf_Size(pattern->lhs)));
505 } else if (pattern->flags & VAR_MATCH_START) {
507 * Had to match at start of word and didn't -- copy
512 } else if (pattern->flags & VAR_MATCH_END) {
514 * Anchored at end, Find only place match could occur
515 * (leftLen characters from the end of the word) and
516 * see if it does. Note that because the $ will be
517 * left at the end of the lhs, we have to use strncmp.
519 cp = word + (wordLen - Buf_Size(pattern->lhs));
520 if ((cp >= word) && (strncmp(cp, Buf_Data(pattern->lhs),
521 Buf_Size(pattern->lhs)) == 0)) {
523 * Match found. If we will place characters in
524 * the buffer, add a space before hand as
525 * indicated by addSpace, then stuff in the
526 * initial, unmatched part of the word followed
527 * by the right-hand-side.
529 if ((cp - word) + Buf_Size(pattern->rhs) != 0) {
531 Buf_AddByte(buf, (Byte)' ');
535 Buf_AppendRange(buf, word, cp);
536 Buf_AppendBuf(buf, pattern->rhs);
540 * Had to match at end and didn't. Copy entire
547 * Pattern is unanchored: search for the pattern in the
548 * word using strstr(3), copying unmatched portions and
549 * the right-hand-side for each match found, handling
550 * non-global substitutions correctly, etc. When the
551 * loop is done, any remaining part of the word (word
552 * and wordLen are adjusted accordingly through the
553 * loop) is copied straight into the buffer.
554 * addSpace is set FALSE as soon as a space is added
561 origSize = Buf_Size(buf);
563 cp = strstr(word, Buf_Data(pattern->lhs));
565 if (addSpace && (((cp - word) +
566 Buf_Size(pattern->rhs)) != 0)) {
567 Buf_AddByte(buf, (Byte)' ');
570 Buf_AppendRange(buf, word, cp);
571 Buf_AppendBuf(buf, pattern->rhs);
572 wordLen -= (cp - word) +
573 Buf_Size(pattern->lhs);
574 word = cp + Buf_Size(pattern->lhs);
575 if (wordLen == 0 || (pattern->flags &
576 VAR_SUB_GLOBAL) == 0) {
585 Buf_AddByte(buf, (Byte)' ');
587 Buf_AddBytes(buf, wordLen, (const Byte *)word);
591 * If added characters to the buffer, need to add a
592 * space before we add any more. If we didn't add any,
593 * just return the previous value of addSpace.
595 return ((Buf_Size(buf) != origSize) || addSpace);
598 * Common code for anchored substitutions:
599 * addSpace was set TRUE if characters were added to the buffer.
605 Buf_AddByte(buf, (Byte)' ');
607 Buf_AddBytes(buf, wordLen, (const Byte *)word);
612 * Print the error caused by a regcomp or regexec call.
615 * An error gets printed.
618 VarREError(int err, regex_t *pat, const char *str)
623 errlen = regerror(err, pat, 0, 0);
624 errbuf = emalloc(errlen);
625 regerror(err, pat, errbuf, errlen);
626 Error("%s: %s", str, errbuf);
632 * Perform a regex substitution on the given word, placing the
633 * result in the passed buffer. A space is added if requested.
636 * TRUE if a space is needed before more characters are added.
639 VarRESubstitute(const char *word, Boolean addSpace, Buffer *buf, void *patternp)
648 #define MAYBE_ADD_SPACE() \
649 if (addSpace && !added) \
650 Buf_AddByte(buf, (Byte)' '); \
657 if ((pat->flags & (VAR_SUB_ONE | VAR_SUB_MATCHED)) ==
658 (VAR_SUB_ONE | VAR_SUB_MATCHED)) {
662 xrv = regexec(&pat->re, wp, pat->nsub, pat->matches, flags);
667 pat->flags |= VAR_SUB_MATCHED;
668 if (pat->matches[0].rm_so > 0) {
670 Buf_AddBytes(buf, pat->matches[0].rm_so,
674 for (rp = Buf_Data(pat->rhs); *rp; rp++) {
675 if ((*rp == '\\') && ((rp[1] == '&') || (rp[1] == '\\'))) {
677 Buf_AddByte(buf, (Byte)rp[1]);
680 } else if ((*rp == '&') ||
681 ((*rp == '\\') && isdigit((unsigned char)rp[1]))) {
700 Error("No subexpression %s",
705 } else if ((pat->matches[n].rm_so == -1) &&
706 (pat->matches[n].rm_eo == -1)) {
707 Error("No match for subexpression %s",
713 subbuf = wp + pat->matches[n].rm_so;
714 sublen = pat->matches[n].rm_eo -
715 pat->matches[n].rm_so;
720 Buf_AddBytes(buf, sublen,
721 (const Byte *)subbuf);
725 Buf_AddByte(buf, (Byte)*rp);
728 wp += pat->matches[0].rm_eo;
729 if (pat->flags & VAR_SUB_GLOBAL) {
731 if (pat->matches[0].rm_so == 0 &&
732 pat->matches[0].rm_eo == 0) {
734 Buf_AddByte(buf, (Byte)*wp);
747 VarREError(xrv, &pat->re, "Unexpected regex error");
757 return (addSpace || added);
761 * Find a variable in a variable list.
764 VarLookup(Lst *vlist, const char *name)
768 LST_FOREACH(ln, vlist)
769 if (strcmp(((const Var *)Lst_Datum(ln))->name, name) == 0)
770 return (Lst_Datum(ln));
775 * Expand a variable name's embedded variables in the given context.
778 * The contents of name, possibly expanded.
781 VarPossiblyExpand(const char *name, GNode *ctxt)
785 if (strchr(name, '$') != NULL) {
786 buf = Var_Subst(name, ctxt, 0);
787 return (Buf_Peel(buf));
789 return estrdup(name);
794 * If the variable name begins with a '.', it could very well be
795 * one of the local ones. We check the name against all the local
796 * variables and substitute the short version in for 'name' if it
797 * matches one of them.
800 VarLocal(const char name[])
802 if (name[0] == '.') {
805 if (!strcmp(name, ".ALLSRC"))
807 if (!strcmp(name, ".ARCHIVE"))
811 if (!strcmp(name, ".IMPSRC"))
815 if (!strcmp(name, ".MEMBER"))
819 if (!strcmp(name, ".OODATE"))
823 if (!strcmp(name, ".PREFIX"))
827 if (!strcmp(name, ".TARGET"))
838 * Find the given variable in the given context and the enviornment.
841 * A pointer to the structure describing the desired variable or
842 * NULL if the variable does not exist.
845 VarFindEnv(const char name[], GNode *ctxt)
849 name = VarLocal(name);
851 if ((var = VarLookup(&ctxt->context, name)) != NULL)
854 if ((var = VarLookup(&VAR_ENV->context, name)) != NULL)
861 * Look for the variable in the given context.
864 VarFindOnly(const char name[], GNode *ctxt)
867 return VarLookup(&ctxt->context, VarLocal(name));
871 * Look for the variable in all contexts.
874 VarFindAny(const char name[], GNode *ctxt)
876 Boolean localCheckEnvFirst;
880 name = VarLocal(name);
883 * Note whether this is one of the specific variables we were told
884 * through the -E flag to use environment-variable-override for.
886 localCheckEnvFirst = FALSE;
887 LST_FOREACH(ln, &envFirstVars) {
888 if (strcmp(Lst_Datum(ln), name) == 0) {
889 localCheckEnvFirst = TRUE;
895 * First look for the variable in the given context. If it's not there,
896 * look for it in VAR_CMD, VAR_GLOBAL and the environment,
897 * in that order, depending on the FIND_* flags in 'flags'
899 if ((var = VarLookup(&ctxt->context, name)) != NULL)
902 /* not there - try command line context */
903 if (ctxt != VAR_CMD) {
904 if ((var = VarLookup(&VAR_CMD->context, name)) != NULL)
908 /* not there - try global context, but only if not -e/-E */
909 if (ctxt != VAR_GLOBAL && (!checkEnvFirst && !localCheckEnvFirst)) {
910 if ((var = VarLookup(&VAR_GLOBAL->context, name)) != NULL)
914 if ((var = VarLookup(&VAR_ENV->context, name)) != NULL)
917 /* deferred check for the environment (in case of -e/-E) */
918 if ((ctxt != VAR_GLOBAL) && (checkEnvFirst || localCheckEnvFirst)) {
919 if ((var = VarLookup(&VAR_GLOBAL->context, name)) != NULL)
927 * Add a new variable of name name and value val to the given context.
930 * The new variable is placed at the front of the given context
931 * The name and val arguments are duplicated so they may
935 VarAdd(const char *name, const char *val, GNode *ctxt)
938 Lst_AtFront(&ctxt->context, VarCreate(name, val, 0));
939 DEBUGF(VAR, ("%s:%s = %s\n", ctxt->name, name, val));
943 * Remove a variable from a context.
946 * The Var structure is removed and freed.
949 Var_Delete(const char *name, GNode *ctxt)
953 DEBUGF(VAR, ("%s:delete %s\n", ctxt->name, name));
954 LST_FOREACH(ln, &ctxt->context) {
955 if (strcmp(((const Var *)Lst_Datum(ln))->name, name) == 0) {
956 VarDestroy(Lst_Datum(ln), TRUE);
957 Lst_Remove(&ctxt->context, ln);
964 * Set the variable name to the value val in the given context.
967 * If the variable doesn't yet exist, a new record is created for it.
968 * Else the old value is freed and the new one stuck in its place
971 * The variable is searched for only in its context before being
972 * created in that context. I.e. if the context is VAR_GLOBAL,
973 * only VAR_GLOBAL->context is searched. Likewise if it is VAR_CMD, only
974 * VAR_CMD->context is searched. This is done to avoid the literally
975 * thousands of unnecessary strcmp's that used to be done to
976 * set, say, $(@) or $(<).
979 Var_Set(const char *name, const char *val, GNode *ctxt)
985 * We only look for a variable in the given context since anything
986 * set here will override anything in a lower context, so there's not
987 * much point in searching them all just to save a bit of memory...
989 n = VarPossiblyExpand(name, ctxt);
990 v = VarFindOnly(n, ctxt);
992 VarAdd(n, val, ctxt);
993 if (ctxt == VAR_CMD) {
995 * Any variables given on the command line
996 * are automatically exported to the
997 * environment (as per POSIX standard)
1003 Buf_Append(v->val, val);
1005 if (ctxt == VAR_CMD || (v->flags & VAR_TO_ENV)) {
1007 * Any variables given on the command line
1008 * are automatically exported to the
1009 * environment (as per POSIX standard)
1016 DEBUGF(VAR, ("%s:%s = %s\n", ctxt->name, n, val));
1021 * Set the VAR_TO_ENV flag on a variable
1024 Var_SetEnv(const char *name, GNode *ctxt)
1028 v = VarFindOnly(name, VAR_CMD);
1031 * Do not allow .EXPORT: to be set on variables
1032 * from the comand line or MAKEFLAGS.
1035 "Warning: Did not set .EXPORTVAR: on %s because it "
1036 "is from the comand line or MAKEFLAGS", name);
1040 v = VarFindAny(name, ctxt);
1042 Lst_AtFront(&VAR_ENV->context,
1043 VarCreate(name, NULL, VAR_TO_ENV));
1044 setenv(name, "", 1);
1045 Error("Warning: .EXPORTVAR: set on undefined variable %s", name);
1047 if ((v->flags & VAR_TO_ENV) == 0) {
1048 v->flags |= VAR_TO_ENV;
1049 setenv(v->name, Buf_Data(v->val), 1);
1055 * The variable of the given name has the given value appended to it in
1056 * the given context.
1059 * If the variable doesn't exist, it is created. Else the strings
1060 * are concatenated (with a space in between).
1063 * Only if the variable is being sought in the global context is the
1064 * environment searched.
1065 * XXX: Knows its calling circumstances in that if called with ctxt
1066 * an actual target, it will only search that context since only
1067 * a local variable could be being appended to. This is actually
1068 * a big win and must be tolerated.
1071 Var_Append(const char *name, const char *val, GNode *ctxt)
1076 n = VarPossiblyExpand(name, ctxt);
1077 if (ctxt == VAR_GLOBAL) {
1078 v = VarFindEnv(n, ctxt);
1080 v = VarFindOnly(n, ctxt);
1083 VarAdd(n, val, ctxt);
1085 Buf_AddByte(v->val, (Byte)' ');
1086 Buf_Append(v->val, val);
1087 DEBUGF(VAR, ("%s:%s = %s\n", ctxt->name, n, Buf_Data(v->val)));
1093 * See if the given variable exists.
1096 * TRUE if it does, FALSE if it doesn't
1099 Var_Exists(const char *name, GNode *ctxt)
1104 n = VarPossiblyExpand(name, ctxt);
1105 v = VarFindAny(n, ctxt);
1116 * Return the value of the named variable in the given context
1119 * The value if the variable exists, NULL if it doesn't
1122 Var_Value(const char *name, GNode *ctxt, char **frp)
1128 n = VarPossiblyExpand(name, ctxt);
1129 v = VarFindAny(n, ctxt);
1134 p = Buf_Data(v->val);
1142 * Modify each of the words of the passed string using the given
1143 * function. Used to implement all modifiers.
1146 * A string of all the words modified appropriately.
1149 * Uses brk_string() so it invalidates any previous call to
1153 VarModify(const char *str, VarModifyProc *modProc, void *datum)
1155 char **av; /* word list [first word does not count] */
1157 Buffer *buf; /* Buffer for the new string */
1158 Boolean addSpace; /* TRUE if need to add a space to the buffer
1159 * before adding the trimmed word */
1162 av = brk_string(str, &ac, FALSE);
1167 for (i = 1; i < ac; i++)
1168 addSpace = (*modProc)(av[i], addSpace, buf, datum);
1170 return (Buf_Peel(buf));
1174 * Sort the words in the string.
1177 * str String whose words should be sorted
1178 * cmp A comparison function to control the ordering
1181 * A string containing the words sorted
1184 * Uses brk_string() so it invalidates any previous call to
1188 VarSortWords(const char *str, int (*cmp)(const void *, const void *))
1195 av = brk_string(str, &ac, FALSE);
1196 qsort(av + 1, ac - 1, sizeof(char *), cmp);
1199 for (i = 1; i < ac; i++) {
1200 Buf_Append(buf, av[i]);
1201 Buf_AddByte(buf, (Byte)((i < ac - 1) ? ' ' : '\0'));
1204 return (Buf_Peel(buf));
1208 SortIncreasing(const void *l, const void *r)
1211 return (strcmp(*(const char* const*)l, *(const char* const*)r));
1215 * Pass through the tstr looking for 1) escaped delimiters,
1216 * '$'s and backslashes (place the escaped character in
1217 * uninterpreted) and 2) unescaped $'s that aren't before
1218 * the delimiter (expand the variable substitution).
1219 * Return the expanded string or NULL if the delimiter was missing
1220 * If pattern is specified, handle escaped ampersands, and replace
1221 * unescaped ampersands with the lhs of the pattern.
1224 * A string of all the words modified appropriately.
1225 * If length is specified, return the string length of the buffer
1226 * If flags is specified and the last character of the pattern is a
1227 * $ set the VAR_MATCH_END bit of flags.
1230 VarGetPattern(VarParser *vp, int delim, int *flags, VarPattern *patt)
1237 * Skim through until the matching delimiter is found; pick up
1238 * variable substitutions on the way. Also allow backslashes to quote
1239 * the delimiter, $, and \, but don't touch other backslashes.
1241 while (*vp->ptr != '\0') {
1242 if (*vp->ptr == delim) {
1245 } else if ((vp->ptr[0] == '\\') &&
1246 ((vp->ptr[1] == delim) ||
1247 (vp->ptr[1] == '\\') ||
1248 (vp->ptr[1] == '$') ||
1249 (vp->ptr[1] == '&' && patt != NULL))) {
1250 vp->ptr++; /* consume backslash */
1251 Buf_AddByte(buf, (Byte)vp->ptr[0]);
1254 } else if (vp->ptr[0] == '$') {
1255 if (vp->ptr[1] == delim) {
1256 if (flags == NULL) {
1257 Buf_AddByte(buf, (Byte)vp->ptr[0]);
1261 * Unescaped $ at end of patt =>
1262 * anchor patt at end.
1264 *flags |= VAR_MATCH_END;
1279 * If unescaped dollar sign not
1280 * before the delimiter, assume it's
1281 * a variable substitution and
1284 rval = VarParse(&subvp, &rfree);
1285 Buf_Append(buf, rval);
1288 vp->ptr = subvp.ptr;
1290 } else if (vp->ptr[0] == '&' && patt != NULL) {
1291 Buf_AppendBuf(buf, patt->lhs);
1294 Buf_AddByte(buf, (Byte)vp->ptr[0]);
1299 Buf_Destroy(buf, TRUE);
1304 * Make sure this variable is fully expanded.
1307 VarExpand(Var *v, VarParser *vp)
1312 if (v->flags & VAR_IN_USE) {
1313 Fatal("Variable %s is recursive.", v->name);
1317 v->flags |= VAR_IN_USE;
1320 * Before doing any modification, we have to make sure the
1321 * value has been fully expanded. If it looks like recursion
1322 * might be necessary (there's a dollar sign somewhere in the
1323 * variable's value) we just call Var_Subst to do any other
1324 * substitutions that are necessary. Note that the value
1325 * returned by Var_Subst will have been
1326 * dynamically-allocated, so it will need freeing when we
1329 value = Buf_Data(v->val);
1330 if (strchr(value, '$') == NULL) {
1331 result = strdup(value);
1335 buf = Var_Subst(value, vp->ctxt, vp->err);
1336 result = Buf_Peel(buf);
1339 v->flags &= ~VAR_IN_USE;
1345 * Select only those words in value that match the modifier.
1348 modifier_M(VarParser *vp, const char value[], char endc)
1355 modifier = vp->ptr[0];
1356 vp->ptr++; /* consume 'M' or 'N' */
1359 * Compress the \:'s out of the pattern, so allocate enough
1360 * room to hold the uncompressed pattern and compress the
1361 * pattern into that space.
1363 patt = estrdup(vp->ptr);
1365 while (vp->ptr[0] != '\0') {
1366 if (vp->ptr[0] == endc || vp->ptr[0] == ':') {
1369 if (vp->ptr[0] == '\\' &&
1370 (vp->ptr[1] == endc || vp->ptr[1] == ':')) {
1371 vp->ptr++; /* consume backslash */
1379 if (modifier == 'M') {
1380 newValue = VarModify(value, VarMatch, patt);
1382 newValue = VarModify(value, VarNoMatch, patt);
1390 * Substitute the replacement string for the pattern. The substitution
1391 * is applied to each word in value.
1394 modifier_S(VarParser *vp, const char value[], Var *v)
1402 vp->ptr++; /* consume 'S' */
1404 delim = *vp->ptr; /* used to find end of pattern */
1405 vp->ptr++; /* consume 1st delim */
1408 * If pattern begins with '^', it is anchored to the start of the
1409 * word -- skip over it and flag pattern.
1411 if (*vp->ptr == '^') {
1412 patt.flags |= VAR_MATCH_START;
1416 patt.lhs = VarGetPattern(vp, delim, &patt.flags, NULL);
1417 if (patt.lhs == NULL) {
1419 * LHS didn't end with the delim, complain and exit.
1421 Fatal("Unclosed substitution for %s (%c missing)",
1425 vp->ptr++; /* consume 2nd delim */
1427 patt.rhs = VarGetPattern(vp, delim, NULL, &patt);
1428 if (patt.rhs == NULL) {
1430 * RHS didn't end with the delim, complain and exit.
1432 Fatal("Unclosed substitution for %s (%c missing)",
1436 vp->ptr++; /* consume last delim */
1439 * Check for global substitution. If 'g' after the final delimiter,
1440 * substitution is global and is marked that way.
1442 if (vp->ptr[0] == 'g') {
1443 patt.flags |= VAR_SUB_GLOBAL;
1448 * Global substitution of the empty string causes an infinite number
1449 * of matches, unless anchored by '^' (start of string) or '$' (end
1450 * of string). Catch the infinite substitution here. Note that flags
1451 * can only contain the 3 bits we're interested in so we don't have
1452 * to mask unrelated bits. We can test for equality.
1454 if (Buf_Size(patt.lhs) == 0 && patt.flags == VAR_SUB_GLOBAL)
1455 Fatal("Global substitution of the empty string");
1457 newValue = VarModify(value, VarSubstitute, &patt);
1460 * Free the two strings.
1469 modifier_C(VarParser *vp, char value[], Var *v)
1478 vp->ptr++; /* consume 'C' */
1480 delim = *vp->ptr; /* delimiter between sections */
1482 vp->ptr++; /* consume 1st delim */
1484 patt.lhs = VarGetPattern(vp, delim, NULL, NULL);
1485 if (patt.lhs == NULL) {
1486 Fatal("Unclosed substitution for %s (%c missing)",
1490 vp->ptr++; /* consume 2st delim */
1492 patt.rhs = VarGetPattern(vp, delim, NULL, NULL);
1493 if (patt.rhs == NULL) {
1494 Fatal("Unclosed substitution for %s (%c missing)",
1498 vp->ptr++; /* consume last delim */
1502 patt.flags |= VAR_SUB_GLOBAL;
1503 vp->ptr++; /* consume 'g' */
1506 patt.flags |= VAR_SUB_ONE;
1507 vp->ptr++; /* consume '1' */
1513 error = regcomp(&patt.re, Buf_Data(patt.lhs), REG_EXTENDED);
1515 VarREError(error, &patt.re, "RE substitution error");
1521 patt.nsub = patt.re.re_nsub + 1;
1526 patt.matches = emalloc(patt.nsub * sizeof(regmatch_t));
1528 newValue = VarModify(value, VarRESubstitute, &patt);
1539 sysVvarsub(VarParser *vp, char startc, Var *v, const char value[])
1543 * This can either be a bogus modifier or a System-V substitution
1553 endc = (startc == OPEN_PAREN) ? CLOSE_PAREN : CLOSE_BRACE;
1558 * First we make a pass through the string trying to verify it is a
1559 * SYSV-make-style translation: it must be: <string1>=<string2>)
1564 while (*cp != '\0' && cnt) {
1567 /* continue looking for endc */
1568 } else if (*cp == endc)
1570 else if (*cp == startc)
1576 if (*cp == endc && eqFound) {
1578 * Now we break this sucker into the lhs and rhs.
1580 patt.lhs = VarGetPattern(vp, '=', &patt.flags, NULL);
1581 if (patt.lhs == NULL) {
1582 Fatal("Unclosed substitution for %s (%c missing)",
1585 vp->ptr++; /* consume '=' */
1587 patt.rhs = VarGetPattern(vp, endc, NULL, &patt);
1588 if (patt.rhs == NULL) {
1589 Fatal("Unclosed substitution for %s (%c missing)",
1594 * SYSV modifications happen through the whole string. Note
1595 * the pattern is anchored at the end.
1597 newStr = VarModify(value, VarSYSVMatch, &patt);
1604 Error("Unknown modifier '%c'\n", *vp->ptr);
1606 while (*vp->ptr != '\0') {
1607 if (*vp->ptr == endc && *vp->ptr == ':') {
1619 * Quote shell meta-characters in the string
1625 Var_Quote(const char *str)
1628 /* This should cover most shells :-( */
1629 static char meta[] = "\n \t'`\";&<>()|*?{}[]\\$!#^~";
1631 buf = Buf_Init(MAKE_BSIZE);
1632 for (; *str; str++) {
1633 if (strchr(meta, *str) != NULL)
1634 Buf_AddByte(buf, (Byte)'\\');
1635 Buf_AddByte(buf, (Byte)*str);
1638 return (Buf_Peel(buf));
1643 * Now we need to apply any modifiers the user wants applied.
1646 * words which match the given <pattern>.
1647 * <pattern> is of the standard file
1649 * :S<d><pat1><d><pat2><d>[g]
1650 * Substitute <pat2> for <pat1> in the value
1651 * :C<d><pat1><d><pat2><d>[g]
1652 * Substitute <pat2> for regex <pat1> in the value
1653 * :H Substitute the head of each word
1654 * :T Substitute the tail of each word
1655 * :E Substitute the extension (minus '.') of
1657 * :R Substitute the root of each word
1658 * (pathname minus the suffix).
1660 * Like :S, but the rhs goes to the end of
1662 * :U Converts variable to upper-case.
1663 * :L Converts variable to lower-case.
1665 * XXXHB update this comment or remove it and point to the man page.
1668 ParseModifier(VarParser *vp, char startc, Var *v, Boolean *freeResult)
1673 value = VarExpand(v, vp);
1676 endc = (startc == OPEN_PAREN) ? CLOSE_PAREN : CLOSE_BRACE;
1678 vp->ptr++; /* consume first colon */
1680 while (*vp->ptr != '\0') {
1681 char *newStr; /* New value to return */
1683 if (*vp->ptr == endc) {
1687 DEBUGF(VAR, ("Applying :%c to \"%s\"\n", *vp->ptr, value));
1691 newStr = modifier_M(vp, value, endc);
1694 newStr = modifier_S(vp, value, v);
1697 newStr = modifier_C(vp, value, v);
1700 if (vp->ptr[1] != endc && vp->ptr[1] != ':') {
1702 if ((vp->ptr[0] == 's') &&
1703 (vp->ptr[1] == 'h') &&
1704 (vp->ptr[2] == endc || vp->ptr[2] == ':')) {
1709 Cmd_Exec(value, &error));
1711 newStr = estrdup("");
1715 Error(error, value);
1720 newStr = sysVvarsub(vp, startc, v, value);
1725 switch (vp->ptr[0]) {
1730 buf = Buf_Init(MAKE_BSIZE);
1731 for (cp = value; *cp; cp++)
1732 Buf_AddByte(buf, (Byte)tolower(*cp));
1734 newStr = Buf_Peel(buf);
1740 newStr = VarSortWords(value, SortIncreasing);
1744 newStr = Var_Quote(value);
1748 newStr = VarModify(value, VarTail, NULL);
1755 buf = Buf_Init(MAKE_BSIZE);
1756 for (cp = value; *cp; cp++)
1757 Buf_AddByte(buf, (Byte)toupper(*cp));
1759 newStr = Buf_Peel(buf);
1765 newStr = VarModify(value, VarHead, NULL);
1769 newStr = VarModify(value, VarSuffix, NULL);
1773 newStr = VarModify(value, VarRoot, NULL);
1777 newStr = sysVvarsub(vp, startc, v, value);
1783 DEBUGF(VAR, ("Result is \"%s\"\n", newStr));
1789 *freeResult = (value == var_Error) ? FALSE : TRUE;
1791 if (vp->ptr[0] == ':') {
1792 vp->ptr++; /* consume colon */
1800 ParseRestModifier(VarParser *vp, char startc, Buffer *buf, Boolean *freeResult)
1807 vname = Buf_GetAll(buf, &vlen);
1809 v = VarFindAny(vname, vp->ctxt);
1811 value = ParseModifier(vp, startc, v, freeResult);
1815 if ((vp->ctxt == VAR_CMD) || (vp->ctxt == VAR_GLOBAL)) {
1818 * Still need to get to the end of the variable
1819 * specification, so kludge up a Var structure for the
1822 v = VarCreate(vname, NULL, VAR_JUNK);
1823 value = ParseModifier(vp, startc, v, freeResult);
1827 VarDestroy(v, TRUE);
1829 consumed = vp->ptr - vp->input + 1;
1831 * If substituting a local variable in a non-local context,
1832 * assume it's for dynamic source stuff. We have to handle
1833 * this specially and return the longhand for the variable
1834 * with the dollar sign escaped so it makes it back to the
1835 * caller. Only four of the local variables are treated
1836 * specially as they are the only four that will be set when
1837 * dynamic sources are expanded.
1840 (vlen == 2 && (vname[1] == 'F' || vname[1] == 'D'))) {
1841 if (strchr("!%*@", vname[0]) != NULL) {
1842 value = emalloc(consumed + 1);
1843 strncpy(value, vp->input, consumed);
1844 value[consumed] = '\0';
1852 isupper((unsigned char)vname[1])) {
1853 if ((strncmp(vname, ".TARGET", vlen - 1) == 0) ||
1854 (strncmp(vname, ".ARCHIVE", vlen - 1) == 0) ||
1855 (strncmp(vname, ".PREFIX", vlen - 1) == 0) ||
1856 (strncmp(vname, ".MEMBER", vlen - 1) == 0)) {
1857 value = emalloc(consumed + 1);
1858 strncpy(value, vp->input, consumed);
1859 value[consumed] = '\0';
1866 *freeResult = FALSE;
1867 return (vp->err ? var_Error : varNoError);
1870 * Check for D and F forms of local variables since we're in
1871 * a local context and the name is the right length.
1874 (vname[1] == 'F' || vname[1] == 'D') &&
1875 (strchr("!%*<>@", vname[0]) != NULL)) {
1881 v = VarFindOnly(name, vp->ctxt);
1883 value = ParseModifier(vp, startc, v, freeResult);
1889 * Still need to get to the end of the variable
1890 * specification, so kludge up a Var structure for the
1893 v = VarCreate(vname, NULL, VAR_JUNK);
1894 value = ParseModifier(vp, startc, v, freeResult);
1898 VarDestroy(v, TRUE);
1900 *freeResult = FALSE;
1901 return (vp->err ? var_Error : varNoError);
1906 ParseRestEnd(VarParser *vp, Buffer *buf, Boolean *freeResult)
1913 vname = Buf_GetAll(buf, &vlen);
1915 v = VarFindAny(vname, vp->ctxt);
1917 value = VarExpand(v, vp);
1922 if ((vp->ctxt == VAR_CMD) || (vp->ctxt == VAR_GLOBAL)) {
1923 size_t consumed = vp->ptr - vp->input + 1;
1926 * If substituting a local variable in a non-local context,
1927 * assume it's for dynamic source stuff. We have to handle
1928 * this specially and return the longhand for the variable
1929 * with the dollar sign escaped so it makes it back to the
1930 * caller. Only four of the local variables are treated
1931 * specially as they are the only four that will be set when
1932 * dynamic sources are expanded.
1935 (vlen == 2 && (vname[1] == 'F' || vname[1] == 'D'))) {
1936 if (strchr("!%*@", vname[0]) != NULL) {
1937 value = emalloc(consumed + 1);
1938 strncpy(value, vp->input, consumed);
1939 value[consumed] = '\0';
1947 isupper((unsigned char)vname[1])) {
1948 if ((strncmp(vname, ".TARGET", vlen - 1) == 0) ||
1949 (strncmp(vname, ".ARCHIVE", vlen - 1) == 0) ||
1950 (strncmp(vname, ".PREFIX", vlen - 1) == 0) ||
1951 (strncmp(vname, ".MEMBER", vlen - 1) == 0)) {
1952 value = emalloc(consumed + 1);
1953 strncpy(value, vp->input, consumed);
1954 value[consumed] = '\0';
1962 * Check for D and F forms of local variables since we're in
1963 * a local context and the name is the right length.
1966 (vname[1] == 'F' || vname[1] == 'D') &&
1967 (strchr("!%*<>@", vname[0]) != NULL)) {
1973 v = VarFindOnly(name, vp->ctxt);
1977 * No need for nested expansion or anything,
1978 * as we're the only one who sets these
1979 * things and we sure don't put nested
1980 * invocations in them...
1982 val = Buf_Data(v->val);
1984 if (vname[1] == 'D') {
1985 val = VarModify(val, VarHead, NULL);
1987 val = VarModify(val, VarTail, NULL);
1996 *freeResult = FALSE;
1997 return (vp->err ? var_Error : varNoError);
2001 * Parse a multi letter variable name, and return it's value.
2004 VarParseLong(VarParser *vp, Boolean *freeResult)
2011 buf = Buf_Init(MAKE_BSIZE);
2013 startc = vp->ptr[0];
2014 vp->ptr++; /* consume opening paren or brace */
2016 endc = (startc == OPEN_PAREN) ? CLOSE_PAREN : CLOSE_BRACE;
2019 * Process characters until we reach an end character or a colon,
2020 * replacing embedded variables as we go.
2022 while (*vp->ptr != '\0') {
2023 if (*vp->ptr == endc) {
2024 value = ParseRestEnd(vp, buf, freeResult);
2025 vp->ptr++; /* consume closing paren or brace */
2026 Buf_Destroy(buf, TRUE);
2029 } else if (*vp->ptr == ':') {
2030 value = ParseRestModifier(vp, startc, buf, freeResult);
2031 vp->ptr++; /* consume closing paren or brace */
2032 Buf_Destroy(buf, TRUE);
2035 } else if (*vp->ptr == '$') {
2046 rval = VarParse(&subvp, &rfree);
2047 if (rval == var_Error) {
2048 Fatal("Error expanding embedded variable.");
2050 Buf_Append(buf, rval);
2053 vp->ptr = subvp.ptr;
2055 Buf_AddByte(buf, (Byte)*vp->ptr);
2060 /* If we did not find the end character, return var_Error */
2061 Buf_Destroy(buf, TRUE);
2062 *freeResult = FALSE;
2067 * Parse a single letter variable name, and return it's value.
2070 VarParseShort(VarParser *vp, Boolean *freeResult)
2076 vname[0] = vp->ptr[0];
2079 vp->ptr++; /* consume single letter */
2081 v = VarFindAny(vname, vp->ctxt);
2083 value = VarExpand(v, vp);
2089 * If substituting a local variable in a non-local context, assume
2090 * it's for dynamic source stuff. We have to handle this specially
2091 * and return the longhand for the variable with the dollar sign
2092 * escaped so it makes it back to the caller. Only four of the local
2093 * variables are treated specially as they are the only four that
2094 * will be set when dynamic sources are expanded.
2096 if ((vp->ctxt == VAR_CMD) || (vp->ctxt == VAR_GLOBAL)) {
2098 /* XXX: It looks like $% and $! are reversed here */
2102 return (estrdup("$(.TARGET)"));
2105 return (estrdup("$(.ARCHIVE)"));
2108 return (estrdup("$(.PREFIX)"));
2111 return (estrdup("$(.MEMBER)"));
2113 *freeResult = FALSE;
2114 return (vp->err ? var_Error : varNoError);
2118 /* Variable name was not found. */
2119 *freeResult = FALSE;
2120 return (vp->err ? var_Error : varNoError);
2124 VarParse(VarParser *vp, Boolean *freeResult)
2127 vp->ptr++; /* consume '$' or last letter of conditional */
2129 if (vp->ptr[0] == '\0') {
2130 /* Error, there is only a dollar sign in the input string. */
2131 *freeResult = FALSE;
2132 return (vp->err ? var_Error : varNoError);
2134 } else if (vp->ptr[0] == OPEN_PAREN || vp->ptr[0] == OPEN_BRACE) {
2135 /* multi letter variable name */
2136 return (VarParseLong(vp, freeResult));
2139 /* single letter variable name */
2140 return (VarParseShort(vp, freeResult));
2145 * Given the start of a variable invocation, extract the variable
2146 * name and find its value, then modify it according to the
2150 * The value of the variable or var_Error if the specification
2151 * is invalid. The number of characters in the specification
2152 * is placed in the variable pointed to by consumed. (for
2153 * invalid specifications, this is just 2 to skip the '$' and
2154 * the following letter, or 1 if '$' was the last character
2155 * in the string). A Boolean in *freeResult telling whether the
2156 * returned string should be freed by the caller.
2159 Var_Parse(const char input[], GNode *ctxt, Boolean err,
2160 size_t *consumed, Boolean *freeResult)
2171 value = VarParse(&vp, freeResult);
2172 *consumed += vp.ptr - vp.input;
2177 * Given the start of a variable invocation, determine the length
2178 * of the specification.
2181 * The number of characters in the specification. For invalid
2182 * specifications, this is just 2 to skip the '$' and the
2183 * following letter, or 1 if '$' was the last character in the
2187 Var_Match(const char input[], GNode *ctxt)
2199 value = VarParse(&vp, &freeResult);
2203 return (vp.ptr - vp.input);
2207 match_var(const char str[], const char var[])
2209 const char *start = str;
2212 str++; /* consume '$' */
2214 if (str[0] == OPEN_PAREN || str[0] == OPEN_BRACE) {
2215 str++; /* consume opening paren or brace */
2217 while (str[0] != '\0') {
2218 if (str[0] == '$') {
2220 * A variable inside the variable. We cannot
2221 * expand the external variable yet.
2223 return (str - start);
2224 } else if (str[0] == ':' ||
2225 str[0] == CLOSE_PAREN ||
2226 str[0] == CLOSE_BRACE) {
2227 len = str - (start + 2);
2229 if (var[len] == '\0' && strncmp(var, start + 2, len) == 0) {
2230 return (0); /* match */
2233 * Not the variable we want to
2236 return (str - start);
2242 return (str - start);
2244 /* Single letter variable name */
2245 if (var[1] == '\0' && var[0] == str[0]) {
2246 return (0); /* match */
2248 str++; /* consume variable name */
2249 return (str - start);
2255 * Substitute for all variables in the given string in the given
2256 * context If err is TRUE, Parse_Error will be called when an
2257 * undefined variable is encountered.
2260 * The resulting string.
2263 * None. The old string must be freed by the caller
2266 Var_Subst(const char *str, GNode *ctxt, Boolean err)
2268 Boolean errorReported;
2269 Buffer *buf; /* Buffer for forming things */
2272 * Set TRUE if an error has already been reported to prevent a
2273 * plethora of messages when recursing. XXXHB this comment sounds
2276 errorReported = FALSE;
2279 while (str[0] != '\0') {
2280 if ((str[0] == '$') && (str[1] == '$')) {
2282 * A dollar sign may be escaped with another dollar
2283 * sign. In such a case, we skip over the escape
2284 * character and store the dollar sign into the
2288 Buf_AddByte(buf, (Byte)str[0]);
2291 } else if (str[0] == '$') {
2292 /* Variable invocation. */
2303 rval = VarParse(&subvp, &rfree);
2306 * When we come down here, val should either point to
2307 * the value of this variable, suitably modified, or
2308 * be NULL. Length should be the total length of the
2309 * potential variable invocation (from $ to end
2312 if (rval == var_Error || rval == varNoError) {
2314 * If performing old-time variable
2315 * substitution, skip over the variable and
2316 * continue with the substitution. Otherwise,
2317 * store the dollar sign and advance str so
2318 * we continue with the string...
2324 * If variable is undefined, complain
2325 * and skip the variable. The
2326 * complaint will stop us from doing
2327 * anything when the file is parsed.
2329 if (!errorReported) {
2330 Parse_Error(PARSE_FATAL,
2331 "Undefined variable \"%.*s\"", subvp.ptr - subvp.input, str);
2333 errorReported = TRUE;
2336 Buf_AddByte(buf, (Byte)str[0]);
2341 * Copy all the characters from the variable
2342 * value straight into the new string.
2344 Buf_Append(buf, rval);
2351 Buf_AddByte(buf, (Byte)str[0]);
2360 * Substitute for all variables except if it is the same as 'var',
2361 * in the given string in the given context. If err is TRUE,
2362 * Parse_Error will be called when an undefined variable is
2366 * The resulting string.
2369 * None. The old string must be freed by the caller
2372 Var_SubstOnly(const char *var, const char *str, Boolean err)
2374 GNode *ctxt = VAR_GLOBAL;
2375 Boolean errorReported;
2376 Buffer *buf; /* Buffer for forming things */
2379 * Set TRUE if an error has already been reported to prevent a
2380 * plethora of messages when recursing. XXXHB this comment sounds
2383 errorReported = FALSE;
2386 while (str[0] != '\0') {
2387 if (str[0] == '$') {
2390 skip = match_var(str, var);
2392 Buf_AddBytes(buf, skip, str);
2395 /* Variable invocation. */
2406 rval = VarParse(&subvp, &rfree);
2409 * When we get down here, rval should either
2410 * point to the value of this variable, or be
2413 if (rval == var_Error || rval == varNoError) {
2415 * If performing old-time variable
2416 * substitution, skip over the
2417 * variable and continue with the
2418 * substitution. Otherwise, store the
2419 * dollar sign and advance str so we
2420 * continue with the string...
2426 * If variable is undefined,
2427 * complain and skip the
2428 * variable. The complaint
2429 * will stop us from doing
2430 * anything when the file is
2433 if (!errorReported) {
2434 Parse_Error(PARSE_FATAL,
2435 "Undefined variable \"%.*s\"", subvp.ptr - subvp.input, str);
2437 errorReported = TRUE;
2440 Buf_AddByte(buf, (Byte)str[0]);
2445 * Copy all the characters from the
2446 * variable value straight into the
2449 Buf_Append(buf, rval);
2457 Buf_AddByte(buf, (Byte)str[0]);
2466 * Initialize the module
2469 * The VAR_CMD and VAR_GLOBAL contexts are created
2472 Var_Init(char **env)
2476 VAR_CMD = Targ_NewGN("Command");
2477 VAR_ENV = Targ_NewGN("Environment");
2478 VAR_GLOBAL = Targ_NewGN("Global");
2481 * Copy user environment variables into ENV context.
2483 for (ptr = env; *ptr != NULL; ++ptr) {
2484 char *tmp = estrdup(*ptr);
2485 const char *name = tmp;
2486 char *sep = strchr(name, '=');
2487 const char *value = sep + 1;
2491 VarAdd(name, value, VAR_ENV);
2498 * Print all variables in global and command line contexts.
2506 printf("#*** Global Variables:\n");
2507 LST_FOREACH(ln, &VAR_GLOBAL->context) {
2509 printf("%-16s = %s\n", v->name, Buf_Data(v->val));
2512 printf("#*** Command-line Variables:\n");
2513 LST_FOREACH(ln, &VAR_CMD->context) {
2515 printf("%-16s = %s\n", v->name, Buf_Data(v->val));