/*- * Copyright (c) 1988, 1989, 1990, 1993 * The Regents of the University of California. All rights reserved. * Copyright (c) 1989 by Berkeley Softworks * All rights reserved. * * This code is derived from software contributed to Berkeley by * Adam de Boor. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)var.c 8.3 (Berkeley) 3/19/94 */ #include __FBSDID("$FreeBSD$"); /*- * var.c -- * Variable-handling functions * * Interface: * Var_Set Set the value of a variable in the given * context. The variable is created if it doesn't * yet exist. The value and variable name need not * be preserved. * * Var_Append Append more characters to an existing variable * in the given context. The variable needn't * exist already -- it will be created if it doesn't. * A space is placed between the old value and the * new one. * * Var_Exists See if a variable exists. * * Var_Value Return the value of a variable in a context or * NULL if the variable is undefined. * * Var_Subst Substitute named variable, or all variables if * NULL in a string using * the given context as the top-most one. If the * third argument is non-zero, Parse_Error is * called if any variables are undefined. * * Var_Parse Parse a variable expansion from a string and * return the result and the number of characters * consumed. * * Var_Delete Delete a variable in a context. * * Var_Init Initialize this module. * * Debugging: * Var_Dump Print out all variables defined in the given * context. * * XXX: There's a lot of duplication in these functions. */ #include #include #include #include "buf.h" #include "config.h" #include "globals.h" #include "GNode.h" #include "make.h" #include "nonints.h" #include "parse.h" #include "str.h" #include "targ.h" #include "util.h" #include "var.h" /* * This is a harmless return value for Var_Parse that can be used by Var_Subst * to determine if there was an error in parsing -- easier than returning * a flag, as things outside this module don't give a hoot. */ char var_Error[] = ""; /* * Similar to var_Error, but returned when the 'err' flag for Var_Parse is * set false. Why not just use a constant? Well, gcc likes to condense * identical string instances... */ static char varNoError[] = ""; /* * Internally, variables are contained in four different contexts. * 1) the environment. They may not be changed. If an environment * variable is appended-to, the result is placed in the global * context. * 2) the global context. Variables set in the Makefile are located in * the global context. It is the penultimate context searched when * substituting. * 3) the command-line context. All variables set on the command line * are placed in this context. They are UNALTERABLE once placed here. * 4) the local context. Each target has associated with it a context * list. On this list are located the structures describing such * local variables as $(@) and $(*) * The four contexts are searched in the reverse order from which they are * listed. */ GNode *VAR_GLOBAL; /* variables from the makefile */ GNode *VAR_CMD; /* variables defined on the command-line */ #define FIND_CMD 0x1 /* look in VAR_CMD when searching */ #define FIND_GLOBAL 0x2 /* look in VAR_GLOBAL as well */ #define FIND_ENV 0x4 /* look in the environment also */ static void VarDelete(void *); static char *VarGetPattern(GNode *, int, char **, int, int *, size_t *, VarPattern *); static int VarPrintVar(void *, void *); /*- *----------------------------------------------------------------------- * VarCmp -- * See if the given variable matches the named one. Called from * Lst_Find when searching for a variable of a given name. * * Results: * 0 if they match. non-zero otherwise. * * Side Effects: * none *----------------------------------------------------------------------- */ static int VarCmp(const void *v, const void *name) { return (strcmp(name, ((const Var *)v)->name)); } /*- *----------------------------------------------------------------------- * VarPossiblyExpand -- * Expand a variable name's embedded variables in the given context. * * Results: * The contents of name, possibly expanded. * * Side Effects: * The caller must free the new contents or old contents of name. *----------------------------------------------------------------------- */ static char * VarPossiblyExpand(const char *name, GNode *ctxt) { char *tmp; char *result; /* * XXX make a temporary copy of the name because Var_Subst insists * on writing into the string. */ tmp = estrdup(name); if (strchr(name, '$') != NULL) { result = Var_Subst(NULL, tmp, ctxt, 0); free(tmp); return (result); } else return (tmp); } /*- *----------------------------------------------------------------------- * VarFind -- * Find the given variable in the given context and any other contexts * indicated. * * Flags: * FIND_GLOBAL set means look in the VAR_GLOBAL context too * FIND_CMD set means to look in the VAR_CMD context too * FIND_ENV set means to look in the environment * * Results: * A pointer to the structure describing the desired variable or * NULL if the variable does not exist. * * Side Effects: * None *----------------------------------------------------------------------- */ static Var * VarFind(const char *name, GNode *ctxt, int flags) { Boolean localCheckEnvFirst; LstNode *var; Var *v; /* * If the variable name begins with a '.', it could very well be one of * the local ones. We check the name against all the local variables * and substitute the short version in for 'name' if it matches one of * them. */ if (*name == '.' && isupper((unsigned char)name[1])) switch (name[1]) { case 'A': if (!strcmp(name, ".ALLSRC")) name = ALLSRC; if (!strcmp(name, ".ARCHIVE")) name = ARCHIVE; break; case 'I': if (!strcmp(name, ".IMPSRC")) name = IMPSRC; break; case 'M': if (!strcmp(name, ".MEMBER")) name = MEMBER; break; case 'O': if (!strcmp(name, ".OODATE")) name = OODATE; break; case 'P': if (!strcmp(name, ".PREFIX")) name = PREFIX; break; case 'T': if (!strcmp(name, ".TARGET")) name = TARGET; break; } /* * Note whether this is one of the specific variables we were told through * the -E flag to use environment-variable-override for. */ if (Lst_Find(&envFirstVars, name, (CompareProc *)strcmp) != NULL) { localCheckEnvFirst = TRUE; } else { localCheckEnvFirst = FALSE; } /* * First look for the variable in the given context. If it's not there, * look for it in VAR_CMD, VAR_GLOBAL and the environment, in that order, * depending on the FIND_* flags in 'flags' */ var = Lst_Find(&ctxt->context, name, VarCmp); if ((var == NULL) && (flags & FIND_CMD) && (ctxt != VAR_CMD)) { var = Lst_Find(&VAR_CMD->context, name, VarCmp); } if ((var == NULL) && (flags & FIND_GLOBAL) && (ctxt != VAR_GLOBAL) && !checkEnvFirst && !localCheckEnvFirst) { var = Lst_Find(&VAR_GLOBAL->context, name, VarCmp); } if ((var == NULL) && (flags & FIND_ENV)) { char *env; if ((env = getenv(name)) != NULL) { v = emalloc(sizeof(Var)); v->name = estrdup(name); v->val = Buf_Init(0); v->flags = VAR_FROM_ENV; Buf_Append(v->val, env); return (v); } else if ((checkEnvFirst || localCheckEnvFirst) && (flags & FIND_GLOBAL) && (ctxt != VAR_GLOBAL)) { var = Lst_Find(&VAR_GLOBAL->context, name, VarCmp); if (var == NULL) { return (NULL); } else { return (Lst_Datum(var)); } } else { return (NULL); } } else if (var == NULL) { return (NULL); } else { return (Lst_Datum(var)); } } /*- *----------------------------------------------------------------------- * VarAdd -- * Add a new variable of name name and value val to the given context. * * Results: * None * * Side Effects: * The new variable is placed at the front of the given context * The name and val arguments are duplicated so they may * safely be freed. *----------------------------------------------------------------------- */ static void VarAdd(const char *name, const char *val, GNode *ctxt) { Var *v; v = emalloc(sizeof(Var)); v->name = estrdup(name); v->val = Buf_Init(0); v->flags = 0; if (val != NULL) { Buf_Append(v->val, val); } Lst_AtFront(&ctxt->context, v); DEBUGF(VAR, ("%s:%s = %s\n", ctxt->name, name, val)); } /*- *----------------------------------------------------------------------- * VarDelete -- * Delete a variable and all the space associated with it. * * Results: * None * * Side Effects: * None *----------------------------------------------------------------------- */ static void VarDelete(void *vp) { Var *v = vp; free(v->name); Buf_Destroy(v->val, TRUE); free(v); } /*- *----------------------------------------------------------------------- * Var_Delete -- * Remove a variable from a context. * * Results: * None. * * Side Effects: * The Var structure is removed and freed. * *----------------------------------------------------------------------- */ void Var_Delete(const char *name, GNode *ctxt) { LstNode *ln; DEBUGF(VAR, ("%s:delete %s\n", ctxt->name, name)); ln = Lst_Find(&ctxt->context, name, VarCmp); if (ln != NULL) { VarDelete(Lst_Datum(ln)); Lst_Remove(&ctxt->context, ln); } } /*- *----------------------------------------------------------------------- * Var_Set -- * Set the variable name to the value val in the given context. * * Results: * None. * * Side Effects: * If the variable doesn't yet exist, a new record is created for it. * Else the old value is freed and the new one stuck in its place * * Notes: * The variable is searched for only in its context before being * created in that context. I.e. if the context is VAR_GLOBAL, * only VAR_GLOBAL->context is searched. Likewise if it is VAR_CMD, only * VAR_CMD->context is searched. This is done to avoid the literally * thousands of unnecessary strcmp's that used to be done to * set, say, $(@) or $(<). *----------------------------------------------------------------------- */ void Var_Set(const char *name, const char *val, GNode *ctxt) { Var *v; char *n; /* * We only look for a variable in the given context since anything set * here will override anything in a lower context, so there's not much * point in searching them all just to save a bit of memory... */ n = VarPossiblyExpand(name, ctxt); v = VarFind(n, ctxt, 0); if (v == NULL) { VarAdd(n, val, ctxt); } else { Buf_Clear(v->val); Buf_Append(v->val, val); DEBUGF(VAR, ("%s:%s = %s\n", ctxt->name, n, val)); } /* * Any variables given on the command line are automatically exported * to the environment (as per POSIX standard) */ if (ctxt == VAR_CMD) { setenv(n, val, 1); } free(n); } /*- *----------------------------------------------------------------------- * Var_Append -- * The variable of the given name has the given value appended to it in * the given context. * * Results: * None * * Side Effects: * If the variable doesn't exist, it is created. Else the strings * are concatenated (with a space in between). * * Notes: * Only if the variable is being sought in the global context is the * environment searched. * XXX: Knows its calling circumstances in that if called with ctxt * an actual target, it will only search that context since only * a local variable could be being appended to. This is actually * a big win and must be tolerated. *----------------------------------------------------------------------- */ void Var_Append(const char *name, const char *val, GNode *ctxt) { Var *v; char *n; n = VarPossiblyExpand(name, ctxt); v = VarFind(n, ctxt, (ctxt == VAR_GLOBAL) ? FIND_ENV : 0); if (v == NULL) { VarAdd(n, val, ctxt); } else { Buf_AddByte(v->val, (Byte)' '); Buf_Append(v->val, val); DEBUGF(VAR, ("%s:%s = %s\n", ctxt->name, n, (char *)Buf_GetAll(v->val, (size_t *)NULL))); if (v->flags & VAR_FROM_ENV) { /* * If the original variable came from the environment, we * have to install it in the global context (we could place * it in the environment, but then we should provide a way to * export other variables...) */ v->flags &= ~VAR_FROM_ENV; Lst_AtFront(&ctxt->context, v); } } free(n); } /*- *----------------------------------------------------------------------- * Var_Exists -- * See if the given variable exists. * * Results: * TRUE if it does, FALSE if it doesn't * * Side Effects: * None. * *----------------------------------------------------------------------- */ Boolean Var_Exists(const char *name, GNode *ctxt) { Var *v; char *n; n = VarPossiblyExpand(name, ctxt); v = VarFind(n, ctxt, FIND_CMD|FIND_GLOBAL|FIND_ENV); free(n); if (v == NULL) { return (FALSE); } else if (v->flags & VAR_FROM_ENV) { free(v->name); Buf_Destroy(v->val, TRUE); free(v); } return (TRUE); } /*- *----------------------------------------------------------------------- * Var_Value -- * Return the value of the named variable in the given context * * Results: * The value if the variable exists, NULL if it doesn't * * Side Effects: * None *----------------------------------------------------------------------- */ char * Var_Value(const char *name, GNode *ctxt, char **frp) { Var *v; char *n; n = VarPossiblyExpand(name, ctxt); v = VarFind(n, ctxt, FIND_ENV | FIND_GLOBAL | FIND_CMD); free(n); *frp = NULL; if (v != NULL) { char *p = (char *)Buf_GetAll(v->val, (size_t *)NULL); if (v->flags & VAR_FROM_ENV) { Buf_Destroy(v->val, FALSE); free(v->name); free(v); *frp = p; } return (p); } else { return (NULL); } } /*- *----------------------------------------------------------------------- * VarModify -- * Modify each of the words of the passed string using the given * function. Used to implement all modifiers. * * Results: * A string of all the words modified appropriately. * * Side Effects: * None. * *----------------------------------------------------------------------- */ static char * VarModify(char *str, VarModifyProc *modProc, void *datum) { Buffer *buf; /* Buffer for the new string */ Boolean addSpace; /* TRUE if need to add a space to the * buffer before adding the trimmed * word */ char **av; /* word list [first word does not count] */ int ac, i; buf = Buf_Init(0); addSpace = FALSE; av = brk_string(str, &ac, FALSE); for (i = 1; i < ac; i++) addSpace = (*modProc)(av[i], addSpace, buf, datum); Buf_AddByte(buf, '\0'); str = (char *)Buf_GetAll(buf, (size_t *)NULL); Buf_Destroy(buf, FALSE); return (str); } /*- *----------------------------------------------------------------------- * VarSortWords -- * Sort the words in the string. * * Input: * str String whose words should be sorted * cmp A comparison function to control the ordering * * Results: * A string containing the words sorted * * Side Effects: * None. * *----------------------------------------------------------------------- */ static char * VarSortWords(char *str, int (*cmp)(const void *, const void *)) { Buffer *buf; char **av; int ac, i; buf = Buf_Init(0); av = brk_string(str, &ac, FALSE); qsort(av + 1, ac - 1, sizeof(char *), cmp); for (i = 1; i < ac; i++) { Buf_Append(buf, av[i]); Buf_AddByte(buf, (Byte)((i < ac - 1) ? ' ' : '\0')); } str = (char *)Buf_GetAll(buf, (size_t *)NULL); Buf_Destroy(buf, FALSE); return (str); } static int SortIncreasing(const void *l, const void *r) { return (strcmp(*(const char* const*)l, *(const char* const*)r)); } /*- *----------------------------------------------------------------------- * VarGetPattern -- * Pass through the tstr looking for 1) escaped delimiters, * '$'s and backslashes (place the escaped character in * uninterpreted) and 2) unescaped $'s that aren't before * the delimiter (expand the variable substitution unless flags * has VAR_NOSUBST set). * Return the expanded string or NULL if the delimiter was missing * If pattern is specified, handle escaped ampersands, and replace * unescaped ampersands with the lhs of the pattern. * * Results: * A string of all the words modified appropriately. * If length is specified, return the string length of the buffer * If flags is specified and the last character of the pattern is a * $ set the VAR_MATCH_END bit of flags. * * Side Effects: * None. *----------------------------------------------------------------------- */ static char * VarGetPattern(GNode *ctxt, int err, char **tstr, int delim, int *flags, size_t *length, VarPattern *pattern) { char *cp; Buffer *buf = Buf_Init(0); size_t junk; if (length == NULL) length = &junk; #define IS_A_MATCH(cp, delim) \ ((cp[0] == '\\') && ((cp[1] == delim) || \ (cp[1] == '\\') || (cp[1] == '$') || (pattern && (cp[1] == '&')))) /* * Skim through until the matching delimiter is found; * pick up variable substitutions on the way. Also allow * backslashes to quote the delimiter, $, and \, but don't * touch other backslashes. */ for (cp = *tstr; *cp && (*cp != delim); cp++) { if (IS_A_MATCH(cp, delim)) { Buf_AddByte(buf, (Byte)cp[1]); cp++; } else if (*cp == '$') { if (cp[1] == delim) { if (flags == NULL) Buf_AddByte(buf, (Byte)*cp); else /* * Unescaped $ at end of pattern => anchor * pattern at end. */ *flags |= VAR_MATCH_END; } else { if (flags == NULL || (*flags & VAR_NOSUBST) == 0) { char *cp2; size_t len; Boolean freeIt; /* * If unescaped dollar sign not before the * delimiter, assume it's a variable * substitution and recurse. */ cp2 = Var_Parse(cp, ctxt, err, &len, &freeIt); Buf_Append(buf, cp2); if (freeIt) free(cp2); cp += len - 1; } else { char *cp2 = &cp[1]; if (*cp2 == '(' || *cp2 == '{') { /* * Find the end of this variable reference * and suck it in without further ado. * It will be interperated later. */ int have = *cp2; int want = (*cp2 == '(') ? ')' : '}'; int depth = 1; for (++cp2; *cp2 != '\0' && depth > 0; ++cp2) { if (cp2[-1] != '\\') { if (*cp2 == have) ++depth; if (*cp2 == want) --depth; } } Buf_AppendRange(buf, cp, cp2); cp = --cp2; } else Buf_AddByte(buf, (Byte)*cp); } } } else if (pattern && *cp == '&') Buf_AddBytes(buf, pattern->leftLen, (Byte *)pattern->lhs); else Buf_AddByte(buf, (Byte)*cp); } Buf_AddByte(buf, (Byte)'\0'); if (*cp != delim) { *tstr = cp; *length = 0; return (NULL); } else { *tstr = ++cp; cp = (char *)Buf_GetAll(buf, length); *length -= 1; /* Don't count the NULL */ Buf_Destroy(buf, FALSE); return (cp); } } /*- *----------------------------------------------------------------------- * Var_Quote -- * Quote shell meta-characters in the string * * Results: * The quoted string * * Side Effects: * None. * *----------------------------------------------------------------------- */ char * Var_Quote(const char *str) { Buffer *buf; /* This should cover most shells :-( */ static char meta[] = "\n \t'`\";&<>()|*?{}[]\\$!#^~"; char *ret; buf = Buf_Init(MAKE_BSIZE); for (; *str; str++) { if (strchr(meta, *str) != NULL) Buf_AddByte(buf, (Byte)'\\'); Buf_AddByte(buf, (Byte)*str); } Buf_AddByte(buf, (Byte)'\0'); ret = Buf_GetAll(buf, NULL); Buf_Destroy(buf, FALSE); return (ret); } /*- *----------------------------------------------------------------------- * VarREError -- * Print the error caused by a regcomp or regexec call. * * Results: * None. * * Side Effects: * An error gets printed. * *----------------------------------------------------------------------- */ void VarREError(int err, regex_t *pat, const char *str) { char *errbuf; int errlen; errlen = regerror(err, pat, 0, 0); errbuf = emalloc(errlen); regerror(err, pat, errbuf, errlen); Error("%s: %s", str, errbuf); free(errbuf); } /*- *----------------------------------------------------------------------- * Var_Parse -- * Given the start of a variable invocation, extract the variable * name and find its value, then modify it according to the * specification. * * Results: * The (possibly-modified) value of the variable or var_Error if the * specification is invalid. The length of the specification is * placed in *lengthPtr (for invalid specifications, this is just * 2 to skip the '$' and the following letter, or 1 if '$' was the * last character in the string). * A Boolean in *freePtr telling whether the returned string should * be freed by the caller. * * Side Effects: * None. * *----------------------------------------------------------------------- */ char * Var_Parse(char *str, GNode *ctxt, Boolean err, size_t *lengthPtr, Boolean *freePtr) { char *tstr; /* Pointer into str */ Var *v; /* Variable in invocation */ char *cp; /* Secondary pointer into str (place marker * for tstr) */ Boolean haveModifier;/* TRUE if have modifiers for the variable */ char endc; /* Ending character when variable in parens * or braces */ char startc=0; /* Starting character when variable in parens * or braces */ int cnt; /* Used to count brace pairs when variable in * in parens or braces */ char *start; char delim; Boolean dynamic; /* TRUE if the variable is local and we're * expanding it in a non-local context. This * is done to support dynamic sources. The * result is just the invocation, unaltered */ int vlen; /* length of variable name, after embedded variable * expansion */ *freePtr = FALSE; dynamic = FALSE; start = str; if (str[1] != '(' && str[1] != '{') { /* * If it's not bounded by braces of some sort, life is much simpler. * We just need to check for the first character and return the * value if it exists. */ char name[2]; name[0] = str[1]; name[1] = '\0'; v = VarFind(name, ctxt, FIND_ENV | FIND_GLOBAL | FIND_CMD); if (v == (Var *)NULL) { if (str[1] != '\0') *lengthPtr = 2; else *lengthPtr = 1; if ((ctxt == VAR_CMD) || (ctxt == VAR_GLOBAL)) { /* * If substituting a local variable in a non-local context, * assume it's for dynamic source stuff. We have to handle * this specially and return the longhand for the variable * with the dollar sign escaped so it makes it back to the * caller. Only four of the local variables are treated * specially as they are the only four that will be set * when dynamic sources are expanded. */ /* XXX: It looks like $% and $! are reversed here */ switch (str[1]) { case '@': return ("$(.TARGET)"); case '%': return ("$(.ARCHIVE)"); case '*': return ("$(.PREFIX)"); case '!': return ("$(.MEMBER)"); default: break; } } /* * Error */ return (err ? var_Error : varNoError); } else { haveModifier = FALSE; tstr = &str[1]; endc = str[1]; } } else { /* build up expanded variable name in this buffer */ Buffer *buf = Buf_Init(MAKE_BSIZE); startc = str[1]; endc = startc == '(' ? ')' : '}'; /* * Skip to the end character or a colon, whichever comes first, * replacing embedded variables as we go. */ for (tstr = str + 2; *tstr != '\0' && *tstr != endc && *tstr != ':'; tstr++) if (*tstr == '$') { size_t rlen; Boolean rfree; char* rval = Var_Parse(tstr, ctxt, err, &rlen, &rfree); if (rval == var_Error) { Fatal("Error expanding embedded variable."); } else if (rval != NULL) { Buf_Append(buf, rval); if (rfree) free(rval); } tstr += rlen - 1; } else Buf_AddByte(buf, (Byte)*tstr); if (*tstr == '\0') { /* * If we never did find the end character, return NULL * right now, setting the length to be the distance to * the end of the string, since that's what make does. */ *lengthPtr = tstr - str; return (var_Error); } haveModifier = (*tstr == ':'); *tstr = '\0'; Buf_AddByte(buf, (Byte)'\0'); str = Buf_GetAll(buf, (size_t *)NULL); vlen = strlen(str); v = VarFind(str, ctxt, FIND_ENV | FIND_GLOBAL | FIND_CMD); if ((v == (Var *)NULL) && (ctxt != VAR_CMD) && (ctxt != VAR_GLOBAL) && (vlen == 2) && (str[1] == 'F' || str[1] == 'D')) { /* * Check for bogus D and F forms of local variables since we're * in a local context and the name is the right length. */ switch (str[0]) { case '@': case '%': case '*': case '!': case '>': case '<': { char vname[2]; char *val; /* * Well, it's local -- go look for it. */ vname[0] = str[0]; vname[1] = '\0'; v = VarFind(vname, ctxt, 0); if (v != NULL && !haveModifier) { /* * No need for nested expansion or anything, as we're * the only one who sets these things and we sure don't * put nested invocations in them... */ val = (char *)Buf_GetAll(v->val, (size_t *)NULL); if (str[1] == 'D') { val = VarModify(val, VarHead, (void *)NULL); } else { val = VarModify(val, VarTail, (void *)NULL); } /* * Resulting string is dynamically allocated, so * tell caller to free it. */ *freePtr = TRUE; *lengthPtr = tstr-start+1; *tstr = endc; Buf_Destroy(buf, TRUE); return (val); } break; default: break; } } } if (v == (Var *)NULL) { if (((vlen == 1) || (((vlen == 2) && (str[1] == 'F' || str[1] == 'D')))) && ((ctxt == VAR_CMD) || (ctxt == VAR_GLOBAL))) { /* * If substituting a local variable in a non-local context, * assume it's for dynamic source stuff. We have to handle * this specially and return the longhand for the variable * with the dollar sign escaped so it makes it back to the * caller. Only four of the local variables are treated * specially as they are the only four that will be set * when dynamic sources are expanded. */ switch (str[0]) { case '@': case '%': case '*': case '!': dynamic = TRUE; break; default: break; } } else if ((vlen > 2) && (str[0] == '.') && isupper((unsigned char)str[1]) && ((ctxt == VAR_CMD) || (ctxt == VAR_GLOBAL))) { int len; len = vlen - 1; if ((strncmp(str, ".TARGET", len) == 0) || (strncmp(str, ".ARCHIVE", len) == 0) || (strncmp(str, ".PREFIX", len) == 0) || (strncmp(str, ".MEMBER", len) == 0)) { dynamic = TRUE; } } if (!haveModifier) { /* * No modifiers -- have specification length so we can return * now. */ *lengthPtr = tstr - start + 1; *tstr = endc; if (dynamic) { str = emalloc(*lengthPtr + 1); strncpy(str, start, *lengthPtr); str[*lengthPtr] = '\0'; *freePtr = TRUE; Buf_Destroy(buf, TRUE); return (str); } else { Buf_Destroy(buf, TRUE); return (err ? var_Error : varNoError); } } else { /* * Still need to get to the end of the variable specification, * so kludge up a Var structure for the modifications */ v = emalloc(sizeof(Var)); v->name = estrdup(str); v->val = Buf_Init(1); v->flags = VAR_JUNK; } } Buf_Destroy(buf, TRUE); } if (v->flags & VAR_IN_USE) { Fatal("Variable %s is recursive.", v->name); /*NOTREACHED*/ } else { v->flags |= VAR_IN_USE; } /* * Before doing any modification, we have to make sure the value * has been fully expanded. If it looks like recursion might be * necessary (there's a dollar sign somewhere in the variable's value) * we just call Var_Subst to do any other substitutions that are * necessary. Note that the value returned by Var_Subst will have * been dynamically-allocated, so it will need freeing when we * return. */ str = (char *)Buf_GetAll(v->val, (size_t *)NULL); if (strchr(str, '$') != (char *)NULL) { str = Var_Subst(NULL, str, ctxt, err); *freePtr = TRUE; } v->flags &= ~VAR_IN_USE; /* * Now we need to apply any modifiers the user wants applied. * These are: * :M words which match the given . * is of the standard file * wildcarding form. * :S[g] * Substitute for in the value * :C[g] * Substitute for regex in the value * :H Substitute the head of each word * :T Substitute the tail of each word * :E Substitute the extension (minus '.') of * each word * :R Substitute the root of each word * (pathname minus the suffix). * :lhs=rhs Like :S, but the rhs goes to the end of * the invocation. * :U Converts variable to upper-case. * :L Converts variable to lower-case. */ if ((str != NULL) && haveModifier) { /* * Skip initial colon while putting it back. */ *tstr++ = ':'; while (*tstr != endc) { char *newStr; /* New value to return */ char termc; /* Character which terminated scan */ DEBUGF(VAR, ("Applying :%c to \"%s\"\n", *tstr, str)); switch (*tstr) { case 'N': case 'M': { char *pattern; char *cp2; Boolean copy; copy = FALSE; for (cp = tstr + 1; *cp != '\0' && *cp != ':' && *cp != endc; cp++) { if (*cp == '\\' && (cp[1] == ':' || cp[1] == endc)) { copy = TRUE; cp++; } } termc = *cp; *cp = '\0'; if (copy) { /* * Need to compress the \:'s out of the pattern, so * allocate enough room to hold the uncompressed * pattern (note that cp started at tstr+1, so * cp - tstr takes the null byte into account) and * compress the pattern into the space. */ pattern = emalloc(cp - tstr); for (cp2 = pattern, cp = tstr + 1; *cp != '\0'; cp++, cp2++) { if ((*cp == '\\') && (cp[1] == ':' || cp[1] == endc)) { cp++; } *cp2 = *cp; } *cp2 = '\0'; } else { pattern = &tstr[1]; } if (*tstr == 'M' || *tstr == 'm') { newStr = VarModify(str, VarMatch, pattern); } else { newStr = VarModify(str, VarNoMatch, pattern); } if (copy) { free(pattern); } break; } case 'S': { VarPattern pattern; char del; Buffer *buf; /* Buffer for patterns */ pattern.flags = 0; del = tstr[1]; tstr += 2; /* * If pattern begins with '^', it is anchored to the * start of the word -- skip over it and flag pattern. */ if (*tstr == '^') { pattern.flags |= VAR_MATCH_START; tstr += 1; } buf = Buf_Init(0); /* * Pass through the lhs looking for 1) escaped delimiters, * '$'s and backslashes (place the escaped character in * uninterpreted) and 2) unescaped $'s that aren't before * the delimiter (expand the variable substitution). * The result is left in the Buffer buf. */ for (cp = tstr; *cp != '\0' && *cp != del; cp++) { if ((*cp == '\\') && ((cp[1] == del) || (cp[1] == '$') || (cp[1] == '\\'))) { Buf_AddByte(buf, (Byte)cp[1]); cp++; } else if (*cp == '$') { if (cp[1] != del) { /* * If unescaped dollar sign not before the * delimiter, assume it's a variable * substitution and recurse. */ char *cp2; size_t len; Boolean freeIt; cp2 = Var_Parse(cp, ctxt, err, &len, &freeIt); Buf_Append(buf, cp2); if (freeIt) { free(cp2); } cp += len - 1; } else { /* * Unescaped $ at end of pattern => anchor * pattern at end. */ pattern.flags |= VAR_MATCH_END; } } else { Buf_AddByte(buf, (Byte)*cp); } } Buf_AddByte(buf, (Byte)'\0'); /* * If lhs didn't end with the delimiter, complain and * exit. */ if (*cp != del) { Fatal("Unclosed substitution for %s (%c missing)", v->name, del); } /* * Fetch pattern and destroy buffer, but preserve the data * in it, since that's our lhs. Note that Buf_GetAll * will return the actual number of bytes, which includes * the null byte, so we have to decrement the length by * one. */ pattern.lhs = (char *)Buf_GetAll(buf, &pattern.leftLen); pattern.leftLen--; Buf_Destroy(buf, FALSE); /* * Now comes the replacement string. Three things need to * be done here: 1) need to compress escaped delimiters and * ampersands and 2) need to replace unescaped ampersands * with the l.h.s. (since this isn't regexp, we can do * it right here) and 3) expand any variable substitutions. */ buf = Buf_Init(0); tstr = cp + 1; for (cp = tstr; *cp != '\0' && *cp != del; cp++) { if ((*cp == '\\') && ((cp[1] == del) || (cp[1] == '&') || (cp[1] == '\\') || (cp[1] == '$'))) { Buf_AddByte(buf, (Byte)cp[1]); cp++; } else if ((*cp == '$') && (cp[1] != del)) { char *cp2; size_t len; Boolean freeIt; cp2 = Var_Parse(cp, ctxt, err, &len, &freeIt); Buf_Append(buf, cp2); cp += len - 1; if (freeIt) { free(cp2); } } else if (*cp == '&') { Buf_AddBytes(buf, pattern.leftLen, (Byte *)pattern.lhs); } else { Buf_AddByte(buf, (Byte)*cp); } } Buf_AddByte(buf, (Byte)'\0'); /* * If didn't end in delimiter character, complain */ if (*cp != del) { Fatal("Unclosed substitution for %s (%c missing)", v->name, del); } pattern.rhs = (char *)Buf_GetAll(buf, &pattern.rightLen); pattern.rightLen--; Buf_Destroy(buf, FALSE); /* * Check for global substitution. If 'g' after the final * delimiter, substitution is global and is marked that * way. */ cp++; if (*cp == 'g') { pattern.flags |= VAR_SUB_GLOBAL; cp++; } /* * Global substitution of the empty string causes an * infinite number of matches, unless anchored by '^' * (start of string) or '$' (end of string). Catch the * infinite substitution here. * Note that flags can only contain the 3 bits we're * interested in so we don't have to mask unrelated * bits. We can test for equality. */ if (!pattern.leftLen && pattern.flags == VAR_SUB_GLOBAL) Fatal("Global substitution of the empty string"); termc = *cp; newStr = VarModify(str, VarSubstitute, &pattern); /* * Free the two strings. */ free(pattern.lhs); free(pattern.rhs); break; } case 'C': { VarREPattern pattern; char *re; int error; pattern.flags = 0; delim = tstr[1]; tstr += 2; cp = tstr; if ((re = VarGetPattern(ctxt, err, &cp, delim, NULL, NULL, NULL)) == NULL) { /* was: goto cleanup */ *lengthPtr = cp - start + 1; if (*freePtr) free(str); if (delim != '\0') Fatal("Unclosed substitution for %s (%c missing)", v->name, delim); return (var_Error); } if ((pattern.replace = VarGetPattern(ctxt, err, &cp, delim, NULL, NULL, NULL)) == NULL){ free(re); /* was: goto cleanup */ *lengthPtr = cp - start + 1; if (*freePtr) free(str); if (delim != '\0') Fatal("Unclosed substitution for %s (%c missing)", v->name, delim); return (var_Error); } for (;; cp++) { switch (*cp) { case 'g': pattern.flags |= VAR_SUB_GLOBAL; continue; case '1': pattern.flags |= VAR_SUB_ONE; continue; default: break; } break; } termc = *cp; error = regcomp(&pattern.re, re, REG_EXTENDED); free(re); if (error) { *lengthPtr = cp - start + 1; VarREError(error, &pattern.re, "RE substitution error"); free(pattern.replace); return (var_Error); } pattern.nsub = pattern.re.re_nsub + 1; if (pattern.nsub < 1) pattern.nsub = 1; if (pattern.nsub > 10) pattern.nsub = 10; pattern.matches = emalloc(pattern.nsub * sizeof(regmatch_t)); newStr = VarModify(str, VarRESubstitute, &pattern); regfree(&pattern.re); free(pattern.replace); free(pattern.matches); break; } case 'L': if (tstr[1] == endc || tstr[1] == ':') { Buffer *buf; buf = Buf_Init(MAKE_BSIZE); for (cp = str; *cp ; cp++) Buf_AddByte(buf, (Byte)tolower(*cp)); Buf_AddByte(buf, (Byte)'\0'); newStr = (char *)Buf_GetAll(buf, (size_t *)NULL); Buf_Destroy(buf, FALSE); cp = tstr + 1; termc = *cp; break; } /* FALLTHROUGH */ case 'O': if (tstr[1] == endc || tstr[1] == ':') { newStr = VarSortWords(str, SortIncreasing); cp = tstr + 1; termc = *cp; break; } /* FALLTHROUGH */ case 'Q': if (tstr[1] == endc || tstr[1] == ':') { newStr = Var_Quote(str); cp = tstr + 1; termc = *cp; break; } /*FALLTHRU*/ case 'T': if (tstr[1] == endc || tstr[1] == ':') { newStr = VarModify(str, VarTail, (void *)NULL); cp = tstr + 1; termc = *cp; break; } /*FALLTHRU*/ case 'U': if (tstr[1] == endc || tstr[1] == ':') { Buffer *buf; buf = Buf_Init(MAKE_BSIZE); for (cp = str; *cp ; cp++) Buf_AddByte(buf, (Byte)toupper(*cp)); Buf_AddByte(buf, (Byte)'\0'); newStr = (char *)Buf_GetAll(buf, (size_t *)NULL); Buf_Destroy(buf, FALSE); cp = tstr + 1; termc = *cp; break; } /* FALLTHROUGH */ case 'H': if (tstr[1] == endc || tstr[1] == ':') { newStr = VarModify(str, VarHead, (void *)NULL); cp = tstr + 1; termc = *cp; break; } /*FALLTHRU*/ case 'E': if (tstr[1] == endc || tstr[1] == ':') { newStr = VarModify(str, VarSuffix, (void *)NULL); cp = tstr + 1; termc = *cp; break; } /*FALLTHRU*/ case 'R': if (tstr[1] == endc || tstr[1] == ':') { newStr = VarModify(str, VarRoot, (void *)NULL); cp = tstr + 1; termc = *cp; break; } /*FALLTHRU*/ #ifdef SUNSHCMD case 's': if (tstr[1] == 'h' && (tstr[2] == endc || tstr[2] == ':')) { const char *error; Buffer *buf; buf = Cmd_Exec(str, &error); newStr = Buf_GetAll(buf, NULL); Buf_Destroy(buf, FALSE); if (error) Error(error, str); cp = tstr + 2; termc = *cp; break; } /*FALLTHRU*/ #endif default: { #ifdef SYSVVARSUB /* * This can either be a bogus modifier or a System-V * substitution command. */ VarPattern pattern; Boolean eqFound; pattern.flags = 0; eqFound = FALSE; /* * First we make a pass through the string trying * to verify it is a SYSV-make-style translation: * it must be: =) */ cp = tstr; cnt = 1; while (*cp != '\0' && cnt) { if (*cp == '=') { eqFound = TRUE; /* continue looking for endc */ } else if (*cp == endc) cnt--; else if (*cp == startc) cnt++; if (cnt) cp++; } if (*cp == endc && eqFound) { /* * Now we break this sucker into the lhs and * rhs. We must null terminate them of course. */ cp = tstr; delim = '='; if ((pattern.lhs = VarGetPattern(ctxt, err, &cp, delim, &pattern.flags, &pattern.leftLen, NULL)) == NULL) { /* was: goto cleanup */ *lengthPtr = cp - start + 1; if (*freePtr) free(str); if (delim != '\0') Fatal("Unclosed substitution for %s (%c missing)", v->name, delim); return (var_Error); } delim = endc; if ((pattern.rhs = VarGetPattern(ctxt, err, &cp, delim, NULL, &pattern.rightLen, &pattern)) == NULL) { /* was: goto cleanup */ *lengthPtr = cp - start + 1; if (*freePtr) free(str); if (delim != '\0') Fatal("Unclosed substitution for %s (%c missing)", v->name, delim); return (var_Error); } /* * SYSV modifications happen through the whole * string. Note the pattern is anchored at the end. */ termc = *--cp; delim = '\0'; newStr = VarModify(str, VarSYSVMatch, &pattern); free(pattern.lhs); free(pattern.rhs); termc = endc; } else #endif { Error("Unknown modifier '%c'\n", *tstr); for (cp = tstr+1; *cp != ':' && *cp != endc && *cp != '\0'; cp++) continue; termc = *cp; newStr = var_Error; } } } DEBUGF(VAR, ("Result is \"%s\"\n", newStr)); if (*freePtr) { free(str); } str = newStr; if (str != var_Error) { *freePtr = TRUE; } else { *freePtr = FALSE; } if (termc == '\0') { Error("Unclosed variable specification for %s", v->name); } else if (termc == ':') { *cp++ = termc; } else { *cp = termc; } tstr = cp; } *lengthPtr = tstr - start + 1; } else { *lengthPtr = tstr - start + 1; *tstr = endc; } if (v->flags & VAR_FROM_ENV) { Boolean destroy = FALSE; if (str != (char *)Buf_GetAll(v->val, (size_t *)NULL)) { destroy = TRUE; } else { /* * Returning the value unmodified, so tell the caller to free * the thing. */ *freePtr = TRUE; } free(v->name); Buf_Destroy(v->val, destroy); free(v); } else if (v->flags & VAR_JUNK) { /* * Perform any free'ing needed and set *freePtr to FALSE so the caller * doesn't try to free a static pointer. */ if (*freePtr) { free(str); } *freePtr = FALSE; free(v->name); Buf_Destroy(v->val, TRUE); free(v); if (dynamic) { str = emalloc(*lengthPtr + 1); strncpy(str, start, *lengthPtr); str[*lengthPtr] = '\0'; *freePtr = TRUE; } else { str = err ? var_Error : varNoError; } } return (str); } /*- *----------------------------------------------------------------------- * Var_Subst -- * Substitute for all variables in the given string in the given context * If undefErr is TRUE, Parse_Error will be called when an undefined * variable is encountered. * * Results: * The resulting string. * * Side Effects: * None. The old string must be freed by the caller *----------------------------------------------------------------------- */ char * Var_Subst(const char *var, char *str, GNode *ctxt, Boolean undefErr) { Buffer *buf; /* Buffer for forming things */ char *val; /* Value to substitute for a variable */ size_t length; /* Length of the variable invocation */ Boolean doFree; /* Set true if val should be freed */ char *result; static Boolean errorReported; /* Set true if an error has already * been reported to prevent a plethora * of messages when recursing */ buf = Buf_Init(MAKE_BSIZE); errorReported = FALSE; while (*str) { if (var == NULL && (*str == '$') && (str[1] == '$')) { /* * A dollar sign may be escaped either with another dollar sign. * In such a case, we skip over the escape character and store the * dollar sign into the buffer directly. */ str++; Buf_AddByte(buf, (Byte)*str); str++; } else if (str[0] != '$') { /* * Skip as many characters as possible -- either to the end of * the string or to the next dollar sign (variable invocation). */ const char *cp = str; do { str++; } while (str[0] != '$' && str[0] != '\0'); Buf_AppendRange(buf, cp, str); } else { if (var != NULL) { int expand; for (;;) { if (str[1] != '(' && str[1] != '{') { if (str[1] != *var || var[1] != '\0') { Buf_AddBytes(buf, 2, (const Byte *)str); str += 2; expand = FALSE; } else expand = TRUE; break; } else { char *p; /* * Scan up to the end of the variable name. */ for (p = &str[2]; *p && *p != ':' && *p != ')' && *p != '}'; p++) if (*p == '$') break; /* * A variable inside the variable. We cannot expand * the external variable yet, so we try again with * the nested one */ if (*p == '$') { Buf_AppendRange(buf, str, p); str = p; continue; } if (strncmp(var, str + 2, p - str - 2) != 0 || var[p - str - 2] != '\0') { /* * Not the variable we want to expand, scan * until the next variable */ for (;*p != '$' && *p != '\0'; p++) continue; Buf_AppendRange(buf, str, p); str = p; expand = FALSE; } else expand = TRUE; break; } } if (!expand) continue; } val = Var_Parse(str, ctxt, undefErr, &length, &doFree); /* * When we come down here, val should either point to the * value of this variable, suitably modified, or be NULL. * Length should be the total length of the potential * variable invocation (from $ to end character...) */ if (val == var_Error || val == varNoError) { /* * If performing old-time variable substitution, skip over * the variable and continue with the substitution. Otherwise, * store the dollar sign and advance str so we continue with * the string... */ if (oldVars) { str += length; } else if (undefErr) { /* * If variable is undefined, complain and skip the * variable. The complaint will stop us from doing anything * when the file is parsed. */ if (!errorReported) { Parse_Error(PARSE_FATAL, "Undefined variable \"%.*s\"",length,str); } str += length; errorReported = TRUE; } else { Buf_AddByte(buf, (Byte)*str); str += 1; } } else { /* * We've now got a variable structure to store in. But first, * advance the string pointer. */ str += length; /* * Copy all the characters from the variable value straight * into the new string. */ Buf_Append(buf, val); if (doFree) { free(val); } } } } Buf_AddByte(buf, '\0'); result = (char *)Buf_GetAll(buf, (size_t *)NULL); Buf_Destroy(buf, FALSE); return (result); } /*- *----------------------------------------------------------------------- * Var_GetTail -- * Return the tail from each of a list of words. Used to set the * System V local variables. * * Results: * The resulting string. * * Side Effects: * None. * *----------------------------------------------------------------------- */ char * Var_GetTail(char *file) { return (VarModify(file, VarTail, (void *)NULL)); } /*- *----------------------------------------------------------------------- * Var_GetHead -- * Find the leading components of a (list of) filename(s). * XXX: VarHead does not replace foo by ., as (sun) System V make * does. * * Results: * The leading components. * * Side Effects: * None. * *----------------------------------------------------------------------- */ char * Var_GetHead(char *file) { return (VarModify(file, VarHead, (void *)NULL)); } /*- *----------------------------------------------------------------------- * Var_Init -- * Initialize the module * * Results: * None * * Side Effects: * The VAR_CMD and VAR_GLOBAL contexts are created *----------------------------------------------------------------------- */ void Var_Init(void) { VAR_GLOBAL = Targ_NewGN("Global"); VAR_CMD = Targ_NewGN("Command"); } /****************** PRINT DEBUGGING INFO *****************/ static int VarPrintVar(void *vp, void *dummy __unused) { Var *v = (Var *) vp; printf("%-16s = %s\n", v->name, (char *)Buf_GetAll(v->val, (size_t *)NULL)); return (0); } /*- *----------------------------------------------------------------------- * Var_Dump -- * print all variables in a context *----------------------------------------------------------------------- */ void Var_Dump(GNode *ctxt) { Lst_ForEach(&ctxt->context, VarPrintVar, (void *)NULL); }