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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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 1.218 2005/08/18 07:58:30 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>
109 typedef struct VarParser {
110 const char *const input; /* pointer to input string */
111 const char *ptr; /* current parser pos in input str */
118 char *name; /* the variable's name */
119 struct Buffer *val; /* its value */
120 int flags; /* miscellaneous status flags */
122 #define VAR_IN_USE 1 /* Variable's value currently being used.
123 * Used to avoid recursion */
125 #define VAR_JUNK 4 /* Variable is a junk variable that
126 * should be destroyed when done with
127 * it. Used by Var_Parse for undefined,
128 * modified variables */
130 #define VAR_TO_ENV 8 /* Place variable in environment */
134 struct Buffer *lhs; /* String to match */
135 struct Buffer *rhs; /* Replacement string (w/ &'s removed) */
142 #define VAR_SUB_GLOBAL 0x01 /* Apply substitution globally */
143 #define VAR_SUB_ONE 0x02 /* Apply substitution to one word */
144 #define VAR_SUB_MATCHED 0x04 /* There was a match */
145 #define VAR_MATCH_START 0x08 /* Match at start of word */
146 #define VAR_MATCH_END 0x10 /* Match at end of word */
149 typedef bool VarModifyProc(const char *, bool, struct Buffer *, void *);
151 static char *VarParse(VarParser *, bool *);
154 * This is a harmless return value for Var_Parse that can be used by Var_Subst
155 * to determine if there was an error in parsing -- easier than returning
156 * a flag, as things outside this module don't give a hoot.
158 char var_Error[] = "";
161 * Similar to var_Error, but returned when the 'err' flag for Var_Parse is
162 * set false. Why not just use a constant? Well, gcc likes to condense
163 * identical string instances...
165 static char varNoError[] = "";
168 * Internally, variables are contained in four different contexts.
169 * 1) the environment. They may not be changed. If an environment
170 * variable is appended-to, the result is placed in the global
172 * 2) the global context. Variables set in the Makefile are located in
173 * the global context. It is the penultimate context searched when
175 * 3) the command-line context. All variables set on the command line
176 * are placed in this context. They are UNALTERABLE once placed here.
177 * 4) the local context. Each target has associated with it a context
178 * list. On this list are located the structures describing such
179 * local variables as $(@) and $(*)
180 * The four contexts are searched in the reverse order from which they are
183 static GNode *VAR_ENV; /* variables from the environment */
184 GNode *VAR_GLOBAL; /* variables from the makefile */
185 GNode *VAR_CMD; /* variables defined on the command-line */
187 bool oldVars; /* variable substitution style */
188 bool checkEnvFirst; /* -e flag */
190 #define OPEN_PAREN '('
191 #define CLOSE_PAREN ')'
192 #define OPEN_BRACE '{'
193 #define CLOSE_BRACE '}'
196 * Create a Var object.
198 * @param name Name of variable.
199 * @param value Value of variable.
200 * @param flags Flags set on variable.
203 VarCreate(const char name[], const char value[], int flags)
207 v = emalloc(sizeof(Var));
208 v->name = estrdup(name);
209 v->val = Buf_Init(0);
213 Buf_Append(v->val, value);
219 * Destroy a Var object.
221 * @param v Object to destroy.
222 * @param f true if internal buffer in Buffer object is to be
226 VarDestroy(Var *v, bool f)
229 Buf_Destroy(v->val, f);
235 * Remove the tail of the given word and place the result in the given
239 * true if characters were added to the buffer (a space needs to be
240 * added to the buffer before the next word).
243 * The trimmed word is added to the buffer.
246 VarHead(const char *word, bool addSpace, Buffer *buf, void *dummy __unused)
250 slash = strrchr(word, '/');
253 Buf_AddByte(buf, ' ');
255 Buf_AppendRange(buf, word, slash);
258 * If no directory part, give . (q.v. the POSIX standard)
261 Buf_Append(buf, " .");
263 Buf_AddByte(buf, '.');
270 * Remove the head of the given word and place the result in the given
274 * true if characters were added to the buffer (a space needs to be
275 * added to the buffer before the next word).
278 * The trimmed word is added to the buffer.
281 VarTail(const char *word, bool addSpace, Buffer *buf, void *dummy __unused)
286 Buf_AddByte(buf, ' ');
289 slash = strrchr(word, '/');
292 Buf_Append(buf, slash);
294 Buf_Append(buf, word);
300 * Place the suffix of the given word in the given buffer.
303 * true if characters were added to the buffer (a space needs to be
304 * added to the buffer before the next word).
307 * The suffix from the word is placed in the buffer.
310 VarSuffix(const char *word, bool addSpace, Buffer *buf, void *dummy __unused)
314 dot = strrchr(word, '.');
317 Buf_AddByte(buf, ' ');
320 Buf_Append(buf, dot);
327 * Remove the suffix of the given word and place the result in the
331 * true if characters were added to the buffer (a space needs to be
332 * added to the buffer before the next word).
335 * The trimmed word is added to the buffer.
338 VarRoot(const char *word, bool addSpace, Buffer *buf, void *dummy __unused)
343 Buf_AddByte(buf, ' ');
346 dot = strrchr(word, '.');
348 Buf_AppendRange(buf, word, dot);
350 Buf_Append(buf, word);
356 * Place the word in the buffer if it matches the given pattern.
357 * Callback function for VarModify to implement the :M modifier.
358 * A space will be added if requested. A pattern is supplied
359 * which the word must match.
362 * true if a space should be placed in the buffer before the next
366 * The word may be copied to the buffer.
369 VarMatch(const char *word, bool addSpace, Buffer *buf, void *pattern)
372 if (Str_Match(word, pattern)) {
374 Buf_AddByte(buf, ' ');
377 Buf_Append(buf, word);
384 * Place the word in the buffer if it matches the given pattern.
385 * Callback function for VarModify to implement the System V %
386 * modifiers. A space is added if requested.
389 * true if a space should be placed in the buffer before the next
393 * The word may be copied to the buffer.
396 VarSYSVMatch(const char *word, bool addSpace, Buffer *buf, void *patp)
400 VarPattern *pat = (VarPattern *)patp;
403 Buf_AddByte(buf, ' ');
407 if ((ptr = Str_SYSVMatch(word, Buf_Data(pat->lhs), &len)) != NULL)
408 Str_SYSVSubst(buf, Buf_Data(pat->rhs), ptr, len);
410 Buf_Append(buf, word);
417 * Place the word in the buffer if it doesn't match the given pattern.
418 * Callback function for VarModify to implement the :N modifier. A
419 * space is added if requested.
422 * true if a space should be placed in the buffer before the next
426 * The word may be copied to the buffer.
429 VarNoMatch(const char *word, bool addSpace, Buffer *buf, void *pattern)
432 if (!Str_Match(word, pattern)) {
434 Buf_AddByte(buf, ' ');
437 Buf_Append(buf, word);
443 * Perform a string-substitution on the given word, placing the
444 * result in the passed buffer. A space is added if requested.
447 * true if a space is needed before more characters are added.
450 VarSubstitute(const char *word, bool addSpace, Buffer *buf, void *patternp)
452 size_t wordLen; /* Length of word */
453 const char *cp; /* General pointer */
454 VarPattern *pattern = patternp;
456 wordLen = strlen(word);
457 if (1) { /* substitute in each word of the variable */
459 * Break substitution down into simple anchored cases
460 * and if none of them fits, perform the general substitution
463 if ((pattern->flags & VAR_MATCH_START) &&
464 (strncmp(word, Buf_Data(pattern->lhs),
465 Buf_Size(pattern->lhs)) == 0)) {
467 * Anchored at start and beginning of word matches
470 if ((pattern->flags & VAR_MATCH_END) &&
471 (wordLen == Buf_Size(pattern->lhs))) {
473 * Also anchored at end and matches to the end
474 * (word is same length as pattern) add space
475 * and rhs only if rhs is non-null.
477 if (Buf_Size(pattern->rhs) != 0) {
479 Buf_AddByte(buf, ' ');
482 Buf_AppendBuf(buf, pattern->rhs);
485 } else if (pattern->flags & VAR_MATCH_END) {
487 * Doesn't match to end -- copy word wholesale
493 * Matches at start but need to copy in
494 * trailing characters.
496 if ((Buf_Size(pattern->rhs) + wordLen -
497 Buf_Size(pattern->lhs)) != 0) {
499 Buf_AddByte(buf, ' ');
503 Buf_AppendBuf(buf, pattern->rhs);
504 Buf_AddBytes(buf, wordLen -
505 Buf_Size(pattern->lhs),
506 (word + Buf_Size(pattern->lhs)));
509 } else if (pattern->flags & VAR_MATCH_START) {
511 * Had to match at start of word and didn't -- copy
516 } else if (pattern->flags & VAR_MATCH_END) {
518 * Anchored at end, Find only place match could occur
519 * (leftLen characters from the end of the word) and
520 * see if it does. Note that because the $ will be
521 * left at the end of the lhs, we have to use strncmp.
523 cp = word + (wordLen - Buf_Size(pattern->lhs));
524 if ((cp >= word) && (strncmp(cp, Buf_Data(pattern->lhs),
525 Buf_Size(pattern->lhs)) == 0)) {
527 * Match found. If we will place characters in
528 * the buffer, add a space before hand as
529 * indicated by addSpace, then stuff in the
530 * initial, unmatched part of the word followed
531 * by the right-hand-side.
533 if ((cp - word) + Buf_Size(pattern->rhs) != 0) {
535 Buf_AddByte(buf, ' ');
539 Buf_AppendRange(buf, word, cp);
540 Buf_AppendBuf(buf, pattern->rhs);
544 * Had to match at end and didn't. Copy entire
551 * Pattern is unanchored: search for the pattern in the
552 * word using strstr(3), copying unmatched portions and
553 * the right-hand-side for each match found, handling
554 * non-global substitutions correctly, etc. When the
555 * loop is done, any remaining part of the word (word
556 * and wordLen are adjusted accordingly through the
557 * loop) is copied straight into the buffer.
558 * addSpace is set false as soon as a space is added
565 origSize = Buf_Size(buf);
567 cp = strstr(word, Buf_Data(pattern->lhs));
569 if (addSpace && (((cp - word) +
570 Buf_Size(pattern->rhs)) != 0)) {
571 Buf_AddByte(buf, ' ');
574 Buf_AppendRange(buf, word, cp);
575 Buf_AppendBuf(buf, pattern->rhs);
576 wordLen -= (cp - word) +
577 Buf_Size(pattern->lhs);
578 word = cp + Buf_Size(pattern->lhs);
579 if (wordLen == 0 || (pattern->flags &
580 VAR_SUB_GLOBAL) == 0) {
589 Buf_AddByte(buf, ' ');
591 Buf_AddBytes(buf, wordLen, word);
595 * If added characters to the buffer, need to add a
596 * space before we add any more. If we didn't add any,
597 * just return the previous value of addSpace.
599 return ((Buf_Size(buf) != origSize) || addSpace);
602 * Common code for anchored substitutions:
603 * addSpace was set true if characters were added to the buffer.
609 Buf_AddByte(buf, ' ');
611 Buf_AddBytes(buf, wordLen, word);
616 * Print the error caused by a regcomp or regexec call.
619 * An error gets printed.
622 VarREError(int err, regex_t *pat, const char *str)
627 errlen = regerror(err, pat, 0, 0);
628 errbuf = emalloc(errlen);
629 regerror(err, pat, errbuf, errlen);
630 Error("%s: %s", str, errbuf);
636 * Perform a regex substitution on the given word, placing the
637 * result in the passed buffer. A space is added if requested.
640 * true if a space is needed before more characters are added.
643 VarRESubstitute(const char *word, bool addSpace, Buffer *buf, void *patternp)
652 #define MAYBE_ADD_SPACE() \
653 if (addSpace && !added) \
654 Buf_AddByte(buf, ' '); \
661 if ((pat->flags & (VAR_SUB_ONE | VAR_SUB_MATCHED)) ==
662 (VAR_SUB_ONE | VAR_SUB_MATCHED)) {
666 xrv = regexec(&pat->re, wp, pat->nsub, pat->matches, flags);
671 pat->flags |= VAR_SUB_MATCHED;
672 if (pat->matches[0].rm_so > 0) {
674 Buf_AddBytes(buf, pat->matches[0].rm_so, wp);
677 for (rp = Buf_Data(pat->rhs); *rp; rp++) {
678 if ((*rp == '\\') && ((rp[1] == '&') || (rp[1] == '\\'))) {
680 Buf_AddByte(buf, rp[1]);
683 } else if ((*rp == '&') ||
684 ((*rp == '\\') && isdigit((unsigned char)rp[1]))) {
703 Error("No subexpression %s",
708 } else if ((pat->matches[n].rm_so == -1) &&
709 (pat->matches[n].rm_eo == -1)) {
710 Error("No match for subexpression %s",
716 subbuf = wp + pat->matches[n].rm_so;
717 sublen = pat->matches[n].rm_eo -
718 pat->matches[n].rm_so;
723 Buf_AddBytes(buf, sublen, subbuf);
727 Buf_AddByte(buf, *rp);
730 wp += pat->matches[0].rm_eo;
731 if (pat->flags & VAR_SUB_GLOBAL) {
733 if (pat->matches[0].rm_so == 0 &&
734 pat->matches[0].rm_eo == 0) {
736 Buf_AddByte(buf, *wp);
749 VarREError(xrv, &pat->re, "Unexpected regex error");
759 return (addSpace || added);
763 * Find a variable in a variable list.
766 VarLookup(Lst *vlist, const char *name)
770 LST_FOREACH(ln, vlist)
771 if (strcmp(((const Var *)Lst_Datum(ln))->name, name) == 0)
772 return (Lst_Datum(ln));
777 * Expand a variable name's embedded variables in the given context.
780 * The contents of name, possibly expanded.
783 VarPossiblyExpand(const char *name, GNode *ctxt)
787 if (strchr(name, '$') != NULL) {
788 buf = Var_Subst(name, ctxt, 0);
789 return (Buf_Peel(buf));
791 return estrdup(name);
796 * If the variable name begins with a '.', it could very well be
797 * one of the local ones. We check the name against all the local
798 * variables and substitute the short version in for 'name' if it
799 * matches one of them.
802 VarLocal(const char name[])
804 if (name[0] == '.') {
807 if (!strcmp(name, ".ALLSRC"))
809 if (!strcmp(name, ".ARCHIVE"))
813 if (!strcmp(name, ".IMPSRC"))
817 if (!strcmp(name, ".MEMBER"))
821 if (!strcmp(name, ".OODATE"))
825 if (!strcmp(name, ".PREFIX"))
829 if (!strcmp(name, ".TARGET"))
840 * Find the given variable in the given context and the environment.
843 * A pointer to the structure describing the desired variable or
844 * NULL if the variable does not exist.
847 VarFindEnv(const char name[], GNode *ctxt)
851 name = VarLocal(name);
853 if ((var = VarLookup(&ctxt->context, name)) != NULL)
856 if ((var = VarLookup(&VAR_ENV->context, name)) != NULL)
863 * Look for the variable in the given context.
866 VarFindOnly(const char name[], GNode *ctxt)
869 return (VarLookup(&ctxt->context, VarLocal(name)));
873 * Look for the variable in all contexts.
876 VarFindAny(const char name[], GNode *ctxt)
878 bool localCheckEnvFirst;
882 name = VarLocal(name);
885 * Note whether this is one of the specific variables we were told
886 * through the -E flag to use environment-variable-override for.
888 localCheckEnvFirst = false;
889 LST_FOREACH(ln, &envFirstVars) {
890 if (strcmp(Lst_Datum(ln), name) == 0) {
891 localCheckEnvFirst = true;
897 * First look for the variable in the given context. If it's not there,
898 * look for it in VAR_CMD, VAR_GLOBAL and the environment,
899 * in that order, depending on the FIND_* flags in 'flags'
901 if ((var = VarLookup(&ctxt->context, name)) != NULL)
904 /* not there - try command line context */
905 if (ctxt != VAR_CMD) {
906 if ((var = VarLookup(&VAR_CMD->context, name)) != NULL)
910 /* not there - try global context, but only if not -e/-E */
911 if (ctxt != VAR_GLOBAL && (!checkEnvFirst && !localCheckEnvFirst)) {
912 if ((var = VarLookup(&VAR_GLOBAL->context, name)) != NULL)
916 if ((var = VarLookup(&VAR_ENV->context, name)) != NULL)
919 /* deferred check for the environment (in case of -e/-E) */
920 if ((ctxt != VAR_GLOBAL) && (checkEnvFirst || localCheckEnvFirst)) {
921 if ((var = VarLookup(&VAR_GLOBAL->context, name)) != NULL)
929 * Add a new variable of name name and value val to the given context.
932 * The new variable is placed at the front of the given context
933 * The name and val arguments are duplicated so they may
937 VarAdd(const char *name, const char *val, GNode *ctxt)
940 Lst_AtFront(&ctxt->context, VarCreate(name, val, 0));
941 DEBUGF(VAR, ("%s:%s = %s\n", ctxt->name, name, val));
945 * Remove a variable from a context.
948 * The Var structure is removed and freed.
951 Var_Delete(const char *name, GNode *ctxt)
955 DEBUGF(VAR, ("%s:delete %s\n", ctxt->name, name));
956 LST_FOREACH(ln, &ctxt->context) {
957 if (strcmp(((const Var *)Lst_Datum(ln))->name, name) == 0) {
958 VarDestroy(Lst_Datum(ln), true);
959 Lst_Remove(&ctxt->context, ln);
966 * Set the variable name to the value val in the given context.
969 * If the variable doesn't yet exist, a new record is created for it.
970 * Else the old value is freed and the new one stuck in its place
973 * The variable is searched for only in its context before being
974 * created in that context. I.e. if the context is VAR_GLOBAL,
975 * only VAR_GLOBAL->context is searched. Likewise if it is VAR_CMD, only
976 * VAR_CMD->context is searched. This is done to avoid the literally
977 * thousands of unnecessary strcmp's that used to be done to
978 * set, say, $(@) or $(<).
981 Var_Set(const char *name, const char *val, GNode *ctxt)
987 * We only look for a variable in the given context since anything
988 * set here will override anything in a lower context, so there's not
989 * much point in searching them all just to save a bit of memory...
991 n = VarPossiblyExpand(name, ctxt);
992 v = VarFindOnly(n, ctxt);
994 VarAdd(n, val, ctxt);
995 if (ctxt == VAR_CMD) {
997 * Any variables given on the command line
998 * are automatically exported to the
999 * environment (as per POSIX standard)
1001 if (setenv(n, val, 1) == -1)
1002 Punt( "setenv: %s: can't allocate memory", n);
1006 Buf_Append(v->val, val);
1008 if (ctxt == VAR_CMD || (v->flags & VAR_TO_ENV)) {
1010 * Any variables given on the command line
1011 * are automatically exported to the
1012 * environment (as per POSIX standard)
1014 if (setenv(n, val, 1) == -1)
1015 Punt( "setenv: %s: can't allocate memory", n);
1020 DEBUGF(VAR, ("%s:%s = %s\n", ctxt->name, n, val));
1025 * Set the a global name variable to the value.
1028 Var_SetGlobal(const char name[], const char value[])
1031 Var_Set(name, value, VAR_GLOBAL);
1036 * Set the VAR_TO_ENV flag on a variable
1039 Var_SetEnv(const char *name, GNode *ctxt)
1043 v = VarFindOnly(name, VAR_CMD);
1046 * Do not allow .EXPORT: to be set on variables
1047 * from the command line or MAKEFLAGS.
1050 "Warning: Did not set .EXPORTVAR: on %s because it "
1051 "is from the command line or MAKEFLAGS", name);
1055 v = VarFindAny(name, ctxt);
1057 Lst_AtFront(&VAR_ENV->context,
1058 VarCreate(name, NULL, VAR_TO_ENV));
1059 if (setenv(name, "", 1) == -1)
1060 Punt( "setenv: %s: can't allocate memory", name);
1061 Error("Warning: .EXPORTVAR: set on undefined variable %s", name);
1063 if ((v->flags & VAR_TO_ENV) == 0) {
1064 v->flags |= VAR_TO_ENV;
1065 if (setenv(v->name, Buf_Data(v->val), 1) == -1)
1066 Punt( "setenv: %s: can't allocate memory", v->name);
1072 * The variable of the given name has the given value appended to it in
1073 * the given context.
1076 * If the variable doesn't exist, it is created. Else the strings
1077 * are concatenated (with a space in between).
1080 * Only if the variable is being sought in the global context is the
1081 * environment searched.
1082 * XXX: Knows its calling circumstances in that if called with ctxt
1083 * an actual target, it will only search that context since only
1084 * a local variable could be being appended to. This is actually
1085 * a big win and must be tolerated.
1088 Var_Append(const char *name, const char *val, GNode *ctxt)
1093 n = VarPossiblyExpand(name, ctxt);
1094 if (ctxt == VAR_GLOBAL) {
1095 v = VarFindEnv(n, ctxt);
1097 v = VarFindOnly(n, ctxt);
1100 VarAdd(n, val, ctxt);
1102 Buf_AddByte(v->val, ' ');
1103 Buf_Append(v->val, val);
1104 DEBUGF(VAR, ("%s:%s = %s\n", ctxt->name, n, Buf_Data(v->val)));
1110 * See if the given variable exists.
1113 * true if it does, false if it doesn't
1116 Var_Exists(const char *name, GNode *ctxt)
1121 n = VarPossiblyExpand(name, ctxt);
1122 v = VarFindAny(n, ctxt);
1133 * Return the value of the named variable in the given context
1136 * The value if the variable exists, NULL if it doesn't.
1139 Var_Value(const char name[], GNode *ctxt)
1144 n = VarPossiblyExpand(name, ctxt);
1145 v = VarFindAny(n, ctxt);
1150 return (Buf_Data(v->val));
1155 * Modify each of the words of the passed string using the given
1156 * function. Used to implement all modifiers.
1159 * A string of all the words modified appropriately.
1162 VarModify(const char *str, VarModifyProc *modProc, void *datum)
1165 Buffer *buf; /* Buffer for the new string */
1168 * true if need to add a space to
1169 * the buffer before adding the
1173 brk_string(&aa, str, false);
1177 for (i = 1; i < aa.argc; i++)
1178 addSpace = (*modProc)(aa.argv[i], addSpace, buf, datum);
1181 return (Buf_Peel(buf));
1185 * Sort the words in the string.
1188 * str String whose words should be sorted
1189 * cmp A comparison function to control the ordering
1192 * A string containing the words sorted
1195 VarSortWords(const char *str, int (*cmp)(const void *, const void *))
1201 brk_string(&aa, str, false);
1202 qsort(aa.argv + 1, aa.argc - 1, sizeof(char *), cmp);
1205 for (i = 1; i < aa.argc; i++) {
1206 Buf_Append(buf, aa.argv[i]);
1207 Buf_AddByte(buf, ((i < aa.argc - 1) ? ' ' : '\0'));
1211 return (Buf_Peel(buf));
1215 SortIncreasing(const void *l, const void *r)
1218 return (strcmp(*(const char* const*)l, *(const char* const*)r));
1222 * Pass through the tstr looking for 1) escaped delimiters,
1223 * '$'s and backslashes (place the escaped character in
1224 * uninterpreted) and 2) unescaped $'s that aren't before
1225 * the delimiter (expand the variable substitution).
1226 * Return the expanded string or NULL if the delimiter was missing
1227 * If pattern is specified, handle escaped ampersands, and replace
1228 * unescaped ampersands with the lhs of the pattern.
1231 * A string of all the words modified appropriately.
1232 * If length is specified, return the string length of the buffer
1233 * If flags is specified and the last character of the pattern is a
1234 * $ set the VAR_MATCH_END bit of flags.
1237 VarGetPattern(VarParser *vp, int delim, int *flags, VarPattern *patt)
1244 * Skim through until the matching delimiter is found; pick up
1245 * variable substitutions on the way. Also allow backslashes to quote
1246 * the delimiter, $, and \, but don't touch other backslashes.
1248 while (*vp->ptr != '\0') {
1249 if (*vp->ptr == delim) {
1252 } else if ((vp->ptr[0] == '\\') &&
1253 ((vp->ptr[1] == delim) ||
1254 (vp->ptr[1] == '\\') ||
1255 (vp->ptr[1] == '$') ||
1256 (vp->ptr[1] == '&' && patt != NULL))) {
1257 vp->ptr++; /* consume backslash */
1258 Buf_AddByte(buf, vp->ptr[0]);
1261 } else if (vp->ptr[0] == '$') {
1262 if (vp->ptr[1] == delim) {
1263 if (flags == NULL) {
1264 Buf_AddByte(buf, vp->ptr[0]);
1268 * Unescaped $ at end of patt =>
1269 * anchor patt at end.
1271 *flags |= VAR_MATCH_END;
1286 * If unescaped dollar sign not
1287 * before the delimiter, assume it's
1288 * a variable substitution and
1291 rval = VarParse(&subvp, &rfree);
1292 Buf_Append(buf, rval);
1295 vp->ptr = subvp.ptr;
1297 } else if (vp->ptr[0] == '&' && patt != NULL) {
1298 Buf_AppendBuf(buf, patt->lhs);
1301 Buf_AddByte(buf, vp->ptr[0]);
1306 Buf_Destroy(buf, true);
1311 * Make sure this variable is fully expanded.
1314 VarExpand(Var *v, VarParser *vp)
1319 if (v->flags & VAR_IN_USE) {
1320 Fatal("Variable %s is recursive.", v->name);
1324 v->flags |= VAR_IN_USE;
1327 * Before doing any modification, we have to make sure the
1328 * value has been fully expanded. If it looks like recursion
1329 * might be necessary (there's a dollar sign somewhere in the
1330 * variable's value) we just call Var_Subst to do any other
1331 * substitutions that are necessary. Note that the value
1332 * returned by Var_Subst will have been
1333 * dynamically-allocated, so it will need freeing when we
1336 value = Buf_Data(v->val);
1337 if (strchr(value, '$') == NULL) {
1338 result = strdup(value);
1342 buf = Var_Subst(value, vp->ctxt, vp->err);
1343 result = Buf_Peel(buf);
1346 v->flags &= ~VAR_IN_USE;
1352 * Select only those words in value that match the modifier.
1355 modifier_M(VarParser *vp, const char value[], char endc)
1362 modifier = vp->ptr[0];
1363 vp->ptr++; /* consume 'M' or 'N' */
1366 * Compress the \:'s out of the pattern, so allocate enough
1367 * room to hold the uncompressed pattern and compress the
1368 * pattern into that space.
1370 patt = estrdup(vp->ptr);
1372 while (vp->ptr[0] != '\0') {
1373 if (vp->ptr[0] == endc || vp->ptr[0] == ':') {
1376 if (vp->ptr[0] == '\\' &&
1377 (vp->ptr[1] == endc || vp->ptr[1] == ':')) {
1378 vp->ptr++; /* consume backslash */
1386 if (modifier == 'M') {
1387 newValue = VarModify(value, VarMatch, patt);
1389 newValue = VarModify(value, VarNoMatch, patt);
1397 * Substitute the replacement string for the pattern. The substitution
1398 * is applied to each word in value.
1401 modifier_S(VarParser *vp, const char value[], Var *v)
1409 vp->ptr++; /* consume 'S' */
1411 delim = *vp->ptr; /* used to find end of pattern */
1412 vp->ptr++; /* consume 1st delim */
1415 * If pattern begins with '^', it is anchored to the start of the
1416 * word -- skip over it and flag pattern.
1418 if (*vp->ptr == '^') {
1419 patt.flags |= VAR_MATCH_START;
1423 patt.lhs = VarGetPattern(vp, delim, &patt.flags, NULL);
1424 if (patt.lhs == NULL) {
1426 * LHS didn't end with the delim, complain and exit.
1428 Fatal("Unclosed substitution for %s (%c missing)",
1432 vp->ptr++; /* consume 2nd delim */
1434 patt.rhs = VarGetPattern(vp, delim, NULL, &patt);
1435 if (patt.rhs == NULL) {
1437 * RHS didn't end with the delim, complain and exit.
1439 Fatal("Unclosed substitution for %s (%c missing)",
1443 vp->ptr++; /* consume last delim */
1446 * Check for global substitution. If 'g' after the final delimiter,
1447 * substitution is global and is marked that way.
1449 if (vp->ptr[0] == 'g') {
1450 patt.flags |= VAR_SUB_GLOBAL;
1455 * Global substitution of the empty string causes an infinite number
1456 * of matches, unless anchored by '^' (start of string) or '$' (end
1457 * of string). Catch the infinite substitution here. Note that flags
1458 * can only contain the 3 bits we're interested in so we don't have
1459 * to mask unrelated bits. We can test for equality.
1461 if (Buf_Size(patt.lhs) == 0 && patt.flags == VAR_SUB_GLOBAL)
1462 Fatal("Global substitution of the empty string");
1464 newValue = VarModify(value, VarSubstitute, &patt);
1467 * Free the two strings.
1476 modifier_C(VarParser *vp, char value[], Var *v)
1485 vp->ptr++; /* consume 'C' */
1487 delim = *vp->ptr; /* delimiter between sections */
1489 vp->ptr++; /* consume 1st delim */
1491 patt.lhs = VarGetPattern(vp, delim, NULL, NULL);
1492 if (patt.lhs == NULL) {
1493 Fatal("Unclosed substitution for %s (%c missing)",
1497 vp->ptr++; /* consume 2st delim */
1499 patt.rhs = VarGetPattern(vp, delim, NULL, NULL);
1500 if (patt.rhs == NULL) {
1501 Fatal("Unclosed substitution for %s (%c missing)",
1505 vp->ptr++; /* consume last delim */
1509 patt.flags |= VAR_SUB_GLOBAL;
1510 vp->ptr++; /* consume 'g' */
1513 patt.flags |= VAR_SUB_ONE;
1514 vp->ptr++; /* consume '1' */
1520 error = regcomp(&patt.re, Buf_Data(patt.lhs), REG_EXTENDED);
1522 VarREError(error, &patt.re, "RE substitution error");
1528 patt.nsub = patt.re.re_nsub + 1;
1533 patt.matches = emalloc(patt.nsub * sizeof(regmatch_t));
1535 newValue = VarModify(value, VarRESubstitute, &patt);
1546 sysVvarsub(VarParser *vp, char startc, Var *v, const char value[])
1550 * This can either be a bogus modifier or a System-V substitution
1560 endc = (startc == OPEN_PAREN) ? CLOSE_PAREN : CLOSE_BRACE;
1565 * First we make a pass through the string trying to verify it is a
1566 * SYSV-make-style translation: it must be: <string1>=<string2>)
1571 while (*cp != '\0' && cnt) {
1574 /* continue looking for endc */
1575 } else if (*cp == endc)
1577 else if (*cp == startc)
1583 if (*cp == endc && eqFound) {
1585 * Now we break this sucker into the lhs and rhs.
1587 patt.lhs = VarGetPattern(vp, '=', &patt.flags, NULL);
1588 if (patt.lhs == NULL) {
1589 Fatal("Unclosed substitution for %s (%c missing)",
1592 vp->ptr++; /* consume '=' */
1594 patt.rhs = VarGetPattern(vp, endc, NULL, &patt);
1595 if (patt.rhs == NULL) {
1596 Fatal("Unclosed substitution for %s (%c missing)",
1601 * SYSV modifications happen through the whole string. Note
1602 * the pattern is anchored at the end.
1604 newStr = VarModify(value, VarSYSVMatch, &patt);
1611 Error("Unknown modifier '%c'\n", *vp->ptr);
1613 while (*vp->ptr != '\0') {
1614 if (*vp->ptr == endc && *vp->ptr == ':') {
1626 * Quote shell meta-characters in the string
1632 Var_Quote(const char *str)
1635 /* This should cover most shells :-( */
1636 static char meta[] = "\n \t'`\";&<>()|*?{}[]\\$!#^~";
1638 buf = Buf_Init(MAKE_BSIZE);
1639 for (; *str; str++) {
1640 if (strchr(meta, *str) != NULL)
1641 Buf_AddByte(buf, '\\');
1642 Buf_AddByte(buf, *str);
1645 return (Buf_Peel(buf));
1650 * Now we need to apply any modifiers the user wants applied.
1653 * words which match the given <pattern>.
1654 * <pattern> is of the standard file
1656 * :S<d><pat1><d><pat2><d>[g]
1657 * Substitute <pat2> for <pat1> in the value
1658 * :C<d><pat1><d><pat2><d>[g]
1659 * Substitute <pat2> for regex <pat1> in the value
1660 * :H Substitute the head of each word
1661 * :T Substitute the tail of each word
1662 * :E Substitute the extension (minus '.') of
1664 * :R Substitute the root of each word
1665 * (pathname minus the suffix).
1667 * Like :S, but the rhs goes to the end of
1669 * :U Converts variable to upper-case.
1670 * :L Converts variable to lower-case.
1672 * XXXHB update this comment or remove it and point to the man page.
1675 ParseModifier(VarParser *vp, char startc, Var *v, bool *freeResult)
1680 value = VarExpand(v, vp);
1683 endc = (startc == OPEN_PAREN) ? CLOSE_PAREN : CLOSE_BRACE;
1685 vp->ptr++; /* consume first colon */
1687 while (*vp->ptr != '\0') {
1688 char *newStr; /* New value to return */
1690 if (*vp->ptr == endc) {
1694 DEBUGF(VAR, ("Applying :%c to \"%s\"\n", *vp->ptr, value));
1698 newStr = modifier_M(vp, value, endc);
1701 newStr = modifier_S(vp, value, v);
1704 newStr = modifier_C(vp, value, v);
1707 if (vp->ptr[1] != endc && vp->ptr[1] != ':') {
1709 if ((vp->ptr[0] == 's') &&
1710 (vp->ptr[1] == 'h') &&
1711 (vp->ptr[2] == endc || vp->ptr[2] == ':')) {
1716 Cmd_Exec(value, &error));
1718 newStr = estrdup("");
1722 Error(error, value);
1727 newStr = sysVvarsub(vp, startc, v, value);
1732 switch (vp->ptr[0]) {
1737 buf = Buf_Init(MAKE_BSIZE);
1738 for (cp = value; *cp; cp++)
1739 Buf_AddByte(buf, tolower((unsigned char)*cp));
1741 newStr = Buf_Peel(buf);
1747 newStr = VarSortWords(value, SortIncreasing);
1751 newStr = Var_Quote(value);
1755 newStr = VarModify(value, VarTail, NULL);
1762 buf = Buf_Init(MAKE_BSIZE);
1763 for (cp = value; *cp; cp++)
1764 Buf_AddByte(buf, toupper((unsigned char)*cp));
1766 newStr = Buf_Peel(buf);
1772 newStr = VarModify(value, VarHead, NULL);
1776 newStr = VarModify(value, VarSuffix, NULL);
1780 newStr = VarModify(value, VarRoot, NULL);
1784 newStr = sysVvarsub(vp, startc, v, value);
1790 DEBUGF(VAR, ("Result is \"%s\"\n", newStr));
1796 *freeResult = (value == var_Error) ? false : true;
1798 if (vp->ptr[0] == ':') {
1799 vp->ptr++; /* consume colon */
1807 ParseRestModifier(VarParser *vp, char startc, Buffer *buf, bool *freeResult)
1814 vname = Buf_GetAll(buf, &vlen);
1816 v = VarFindAny(vname, vp->ctxt);
1818 value = ParseModifier(vp, startc, v, freeResult);
1822 if ((vp->ctxt == VAR_CMD) || (vp->ctxt == VAR_GLOBAL)) {
1825 * Still need to get to the end of the variable
1826 * specification, so kludge up a Var structure for the
1829 v = VarCreate(vname, NULL, VAR_JUNK);
1830 value = ParseModifier(vp, startc, v, freeResult);
1834 VarDestroy(v, true);
1836 consumed = vp->ptr - vp->input + 1;
1838 * If substituting a local variable in a non-local context,
1839 * assume it's for dynamic source stuff. We have to handle
1840 * this specially and return the longhand for the variable
1841 * with the dollar sign escaped so it makes it back to the
1842 * caller. Only four of the local variables are treated
1843 * specially as they are the only four that will be set when
1844 * dynamic sources are expanded.
1847 (vlen == 2 && (vname[1] == 'F' || vname[1] == 'D'))) {
1848 if (strchr("!%*@", vname[0]) != NULL) {
1849 value = emalloc(consumed + 1);
1850 strncpy(value, vp->input, consumed);
1851 value[consumed] = '\0';
1859 isupper((unsigned char)vname[1])) {
1860 if ((strncmp(vname, ".TARGET", vlen - 1) == 0) ||
1861 (strncmp(vname, ".ARCHIVE", vlen - 1) == 0) ||
1862 (strncmp(vname, ".PREFIX", vlen - 1) == 0) ||
1863 (strncmp(vname, ".MEMBER", vlen - 1) == 0)) {
1864 value = emalloc(consumed + 1);
1865 strncpy(value, vp->input, consumed);
1866 value[consumed] = '\0';
1873 *freeResult = false;
1874 return (vp->err ? var_Error : varNoError);
1877 * Check for D and F forms of local variables since we're in
1878 * a local context and the name is the right length.
1881 (vname[1] == 'F' || vname[1] == 'D') &&
1882 (strchr("!%*<>@", vname[0]) != NULL)) {
1888 v = VarFindOnly(name, vp->ctxt);
1890 value = ParseModifier(vp, startc, v, freeResult);
1896 * Still need to get to the end of the variable
1897 * specification, so kludge up a Var structure for the
1900 v = VarCreate(vname, NULL, VAR_JUNK);
1901 value = ParseModifier(vp, startc, v, freeResult);
1905 VarDestroy(v, true);
1907 *freeResult = false;
1908 return (vp->err ? var_Error : varNoError);
1913 ParseRestEnd(VarParser *vp, Buffer *buf, bool *freeResult)
1920 vname = Buf_GetAll(buf, &vlen);
1922 v = VarFindAny(vname, vp->ctxt);
1924 value = VarExpand(v, vp);
1929 if ((vp->ctxt == VAR_CMD) || (vp->ctxt == VAR_GLOBAL)) {
1930 size_t consumed = vp->ptr - vp->input + 1;
1933 * If substituting a local variable in a non-local context,
1934 * assume it's for dynamic source stuff. We have to handle
1935 * this specially and return the longhand for the variable
1936 * with the dollar sign escaped so it makes it back to the
1937 * caller. Only four of the local variables are treated
1938 * specially as they are the only four that will be set when
1939 * dynamic sources are expanded.
1942 (vlen == 2 && (vname[1] == 'F' || vname[1] == 'D'))) {
1943 if (strchr("!%*@", vname[0]) != NULL) {
1944 value = emalloc(consumed + 1);
1945 strncpy(value, vp->input, consumed);
1946 value[consumed] = '\0';
1954 isupper((unsigned char)vname[1])) {
1955 if ((strncmp(vname, ".TARGET", vlen - 1) == 0) ||
1956 (strncmp(vname, ".ARCHIVE", vlen - 1) == 0) ||
1957 (strncmp(vname, ".PREFIX", vlen - 1) == 0) ||
1958 (strncmp(vname, ".MEMBER", vlen - 1) == 0)) {
1959 value = emalloc(consumed + 1);
1960 strncpy(value, vp->input, consumed);
1961 value[consumed] = '\0';
1969 * Check for D and F forms of local variables since we're in
1970 * a local context and the name is the right length.
1973 (vname[1] == 'F' || vname[1] == 'D') &&
1974 (strchr("!%*<>@", vname[0]) != NULL)) {
1980 v = VarFindOnly(name, vp->ctxt);
1984 * No need for nested expansion or anything,
1985 * as we're the only one who sets these
1986 * things and we sure don't put nested
1987 * invocations in them...
1989 val = Buf_Data(v->val);
1991 if (vname[1] == 'D') {
1992 val = VarModify(val, VarHead, NULL);
1994 val = VarModify(val, VarTail, NULL);
2003 *freeResult = false;
2004 return (vp->err ? var_Error : varNoError);
2008 * Parse a multi letter variable name, and return it's value.
2011 VarParseLong(VarParser *vp, bool *freeResult)
2018 buf = Buf_Init(MAKE_BSIZE);
2020 startc = vp->ptr[0];
2021 vp->ptr++; /* consume opening paren or brace */
2023 endc = (startc == OPEN_PAREN) ? CLOSE_PAREN : CLOSE_BRACE;
2026 * Process characters until we reach an end character or a colon,
2027 * replacing embedded variables as we go.
2029 while (*vp->ptr != '\0') {
2030 if (*vp->ptr == endc) {
2031 value = ParseRestEnd(vp, buf, freeResult);
2032 vp->ptr++; /* consume closing paren or brace */
2033 Buf_Destroy(buf, true);
2036 } else if (*vp->ptr == ':') {
2037 value = ParseRestModifier(vp, startc, buf, freeResult);
2038 vp->ptr++; /* consume closing paren or brace */
2039 Buf_Destroy(buf, true);
2042 } else if (*vp->ptr == '$') {
2053 rval = VarParse(&subvp, &rfree);
2054 if (rval == var_Error) {
2055 Fatal("Error expanding embedded variable.");
2057 Buf_Append(buf, rval);
2060 vp->ptr = subvp.ptr;
2062 Buf_AddByte(buf, *vp->ptr);
2067 /* If we did not find the end character, return var_Error */
2068 Buf_Destroy(buf, true);
2069 *freeResult = false;
2074 * Parse a single letter variable name, and return it's value.
2077 VarParseShort(VarParser *vp, bool *freeResult)
2083 vname[0] = vp->ptr[0];
2086 vp->ptr++; /* consume single letter */
2088 v = VarFindAny(vname, vp->ctxt);
2090 value = VarExpand(v, vp);
2096 * If substituting a local variable in a non-local context, assume
2097 * it's for dynamic source stuff. We have to handle this specially
2098 * and return the longhand for the variable with the dollar sign
2099 * escaped so it makes it back to the caller. Only four of the local
2100 * variables are treated specially as they are the only four that
2101 * will be set when dynamic sources are expanded.
2103 if ((vp->ctxt == VAR_CMD) || (vp->ctxt == VAR_GLOBAL)) {
2105 /* XXX: It looks like $% and $! are reversed here */
2109 return (estrdup("$(.TARGET)"));
2112 return (estrdup("$(.ARCHIVE)"));
2115 return (estrdup("$(.PREFIX)"));
2118 return (estrdup("$(.MEMBER)"));
2120 *freeResult = false;
2121 return (vp->err ? var_Error : varNoError);
2125 /* Variable name was not found. */
2126 *freeResult = false;
2127 return (vp->err ? var_Error : varNoError);
2131 VarParse(VarParser *vp, bool *freeResult)
2134 vp->ptr++; /* consume '$' or last letter of conditional */
2136 if (vp->ptr[0] == '\0') {
2137 /* Error, there is only a dollar sign in the input string. */
2138 *freeResult = false;
2139 return (vp->err ? var_Error : varNoError);
2141 } else if (vp->ptr[0] == OPEN_PAREN || vp->ptr[0] == OPEN_BRACE) {
2142 /* multi letter variable name */
2143 return (VarParseLong(vp, freeResult));
2146 /* single letter variable name */
2147 return (VarParseShort(vp, freeResult));
2152 * Given the start of a variable invocation, extract the variable
2153 * name and find its value, then modify it according to the
2157 * The value of the variable or var_Error if the specification
2158 * is invalid. The number of characters in the specification
2159 * is placed in the variable pointed to by consumed. (for
2160 * invalid specifications, this is just 2 to skip the '$' and
2161 * the following letter, or 1 if '$' was the last character
2162 * in the string). A bool in *freeResult telling whether the
2163 * returned string should be freed by the caller.
2166 Var_Parse(const char input[], GNode *ctxt, bool err,
2167 size_t *consumed, bool *freeResult)
2178 value = VarParse(&vp, freeResult);
2179 *consumed += vp.ptr - vp.input;
2184 * Given the start of a variable invocation, determine the length
2185 * of the specification.
2188 * The number of characters in the specification. For invalid
2189 * specifications, this is just 2 to skip the '$' and the
2190 * following letter, or 1 if '$' was the last character in the
2194 Var_Match(const char input[], GNode *ctxt)
2206 value = VarParse(&vp, &freeResult);
2210 return (vp.ptr - vp.input);
2214 match_var(const char str[], const char var[])
2216 const char *start = str;
2219 str++; /* consume '$' */
2221 if (str[0] == OPEN_PAREN || str[0] == OPEN_BRACE) {
2222 str++; /* consume opening paren or brace */
2224 while (str[0] != '\0') {
2225 if (str[0] == '$') {
2227 * A variable inside the variable. We cannot
2228 * expand the external variable yet.
2230 return (str - start);
2231 } else if (str[0] == ':' ||
2232 str[0] == CLOSE_PAREN ||
2233 str[0] == CLOSE_BRACE) {
2234 len = str - (start + 2);
2236 if (var[len] == '\0' && strncmp(var, start + 2, len) == 0) {
2237 return (0); /* match */
2240 * Not the variable we want to
2243 return (str - start);
2249 return (str - start);
2251 /* Single letter variable name */
2252 if (var[1] == '\0' && var[0] == str[0]) {
2253 return (0); /* match */
2255 str++; /* consume variable name */
2256 return (str - start);
2262 * Substitute for all variables in the given string in the given
2263 * context If err is true, Parse_Error will be called when an
2264 * undefined variable is encountered.
2267 * The resulting string.
2270 * None. The old string must be freed by the caller
2273 Var_Subst(const char *str, GNode *ctxt, bool err)
2276 Buffer *buf; /* Buffer for forming things */
2279 * Set true if an error has already been reported to prevent a
2280 * plethora of messages when recursing. XXXHB this comment sounds
2283 errorReported = false;
2286 while (str[0] != '\0') {
2287 if ((str[0] == '$') && (str[1] == '$')) {
2289 * A dollar sign may be escaped with another dollar
2290 * sign. In such a case, we skip over the escape
2291 * character and store the dollar sign into the
2295 Buf_AddByte(buf, str[0]);
2298 } else if (str[0] == '$') {
2299 /* Variable invocation. */
2310 rval = VarParse(&subvp, &rfree);
2313 * When we come down here, val should either point to
2314 * the value of this variable, suitably modified, or
2315 * be NULL. Length should be the total length of the
2316 * potential variable invocation (from $ to end
2319 if (rval == var_Error || rval == varNoError) {
2321 * If performing old-time variable
2322 * substitution, skip over the variable and
2323 * continue with the substitution. Otherwise,
2324 * store the dollar sign and advance str so
2325 * we continue with the string...
2331 * If variable is undefined, complain
2332 * and skip the variable. The
2333 * complaint will stop us from doing
2334 * anything when the file is parsed.
2336 if (!errorReported) {
2337 Parse_Error(PARSE_FATAL,
2338 "Undefined variable \"%.*s\"", subvp.ptr - subvp.input, str);
2340 errorReported = true;
2343 Buf_AddByte(buf, str[0]);
2348 * Copy all the characters from the variable
2349 * value straight into the new string.
2351 Buf_Append(buf, rval);
2358 Buf_AddByte(buf, str[0]);
2367 * Substitute for all variables except if it is the same as 'var',
2368 * in the given string in the given context. If err is true,
2369 * Parse_Error will be called when an undefined variable is
2373 * The resulting string.
2376 * None. The old string must be freed by the caller
2379 Var_SubstOnly(const char *var, const char *str, bool err)
2381 GNode *ctxt = VAR_GLOBAL;
2383 Buffer *buf; /* Buffer for forming things */
2386 * Set true if an error has already been reported to prevent a
2387 * plethora of messages when recursing. XXXHB this comment sounds
2390 errorReported = false;
2393 while (str[0] != '\0') {
2394 if (str[0] == '$') {
2397 skip = match_var(str, var);
2399 Buf_AddBytes(buf, skip, str);
2402 /* Variable invocation. */
2413 rval = VarParse(&subvp, &rfree);
2416 * When we get down here, rval should either
2417 * point to the value of this variable, or be
2420 if (rval == var_Error || rval == varNoError) {
2422 * If performing old-time variable
2423 * substitution, skip over the
2424 * variable and continue with the
2425 * substitution. Otherwise, store the
2426 * dollar sign and advance str so we
2427 * continue with the string...
2433 * If variable is undefined,
2434 * complain and skip the
2435 * variable. The complaint
2436 * will stop us from doing
2437 * anything when the file is
2440 if (!errorReported) {
2441 Parse_Error(PARSE_FATAL,
2442 "Undefined variable \"%.*s\"", subvp.ptr - subvp.input, str);
2444 errorReported = true;
2447 Buf_AddByte(buf, str[0]);
2452 * Copy all the characters from the
2453 * variable value straight into the
2456 Buf_Append(buf, rval);
2464 Buf_AddByte(buf, str[0]);
2473 * Initialize the module
2476 * The VAR_CMD and VAR_GLOBAL contexts are created
2479 Var_Init(char **env)
2483 VAR_CMD = Targ_NewGN("Command");
2484 VAR_ENV = Targ_NewGN("Environment");
2485 VAR_GLOBAL = Targ_NewGN("Global");
2488 * Copy user environment variables into ENV context.
2490 for (ptr = env; *ptr != NULL; ++ptr) {
2491 char *tmp = estrdup(*ptr);
2492 const char *name = tmp;
2493 char *sep = strchr(name, '=');
2494 const char *value = sep + 1;
2498 VarAdd(name, value, VAR_ENV);
2505 * Print all variables in global and command line contexts.
2513 printf("#*** Global Variables:\n");
2514 LST_FOREACH(ln, &VAR_GLOBAL->context) {
2516 printf("%-16s = %s\n", v->name, Buf_Data(v->val));
2519 printf("#*** Command-line Variables:\n");
2520 LST_FOREACH(ln, &VAR_CMD->context) {
2522 printf("%-16s = %s\n", v->name, Buf_Data(v->val));
2527 * Print the values of any variables requested by
2531 Var_Print(Lst *vlist, bool expandVars)
2535 LST_FOREACH(n, vlist) {
2536 const char *name = Lst_Datum(n);
2542 v = emalloc(strlen(name) + 1 + 3);
2543 sprintf(v, "${%s}", name);
2545 value = Buf_Peel(Var_Subst(v, VAR_GLOBAL, false));
2546 printf("%s\n", value);
2551 const char *value = Var_Value(name, VAR_GLOBAL);
2552 printf("%s\n", value != NULL ? value : "");