/* $NetBSD: var.c,v 1.98 2005/08/05 00:53:18 christos Exp $ */ /* * Copyright (c) 1988, 1989, 1990, 1993 * The Regents of the University of California. 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. 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. */ /* * 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. */ #ifndef MAKE_NATIVE static char rcsid[] = "$NetBSD: var.c,v 1.98 2005/08/05 00:53:18 christos Exp $"; #else #include #ifndef lint #if 0 static char sccsid[] = "@(#)var.c 8.3 (Berkeley) 3/19/94"; #else __RCSID("$NetBSD: var.c,v 1.98 2005/08/05 00:53:18 christos Exp $"); #endif #endif /* not lint */ #endif /*- * 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. */ #ifndef NO_REGEX #include #include #endif #include #include #include #include "make.h" #include "buf.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 */ typedef struct Var { char *name; /* the variable's name */ Buffer val; /* its value */ int flags; /* miscellaneous status flags */ #define VAR_IN_USE 1 /* Variable's value currently being used. * Used to avoid recursion */ #define VAR_FROM_ENV 2 /* Variable comes from the environment */ #define VAR_JUNK 4 /* Variable is a junk variable that * should be destroyed when done with * it. Used by Var_Parse for undefined, * modified variables */ #define VAR_KEEP 8 /* Variable is VAR_JUNK, but we found * a use for it in some modifier and * the value is therefore valid */ } Var; /* Var*Pattern flags */ #define VAR_SUB_GLOBAL 0x01 /* Apply substitution globally */ #define VAR_SUB_ONE 0x02 /* Apply substitution to one word */ #define VAR_SUB_MATCHED 0x04 /* There was a match */ #define VAR_MATCH_START 0x08 /* Match at start of word */ #define VAR_MATCH_END 0x10 /* Match at end of word */ #define VAR_NOSUBST 0x20 /* don't expand vars in VarGetPattern */ /* Var_Set flags */ #define VAR_NO_EXPORT 0x01 /* do not export */ typedef struct { /* * The following fields are set by Var_Parse() when it * encounters modifiers that need to keep state for use by * subsequent modifiers within the same variable expansion. */ Byte varSpace; /* Word separator in expansions */ Boolean oneBigWord; /* TRUE if we will treat the variable as a * single big word, even if it contains * embedded spaces (as opposed to the * usual behaviour of treating it as * several space-separated words). */ } Var_Parse_State; /* struct passed as ClientData to VarSubstitute() for ":S/lhs/rhs/", * to VarSYSVMatch() for ":lhs=rhs". */ typedef struct { const char *lhs; /* String to match */ int leftLen; /* Length of string */ const char *rhs; /* Replacement string (w/ &'s removed) */ int rightLen; /* Length of replacement */ int flags; } VarPattern; /* struct passed as ClientData to VarLoopExpand() for ":@tvar@str@" */ typedef struct { GNode *ctxt; /* variable context */ char *tvar; /* name of temp var */ int tvarLen; char *str; /* string to expand */ int strLen; int err; /* err for not defined */ } VarLoop_t; #ifndef NO_REGEX /* struct passed as ClientData to VarRESubstitute() for ":C///" */ typedef struct { regex_t re; int nsub; regmatch_t *matches; char *replace; int flags; } VarREPattern; #endif /* struct passed to VarSelectWords() for ":[start..end]" */ typedef struct { int start; /* first word to select */ int end; /* last word to select */ } VarSelectWords_t; static Var *VarFind(const char *, GNode *, int); static void VarAdd(const char *, const char *, GNode *); static Boolean VarHead(GNode *, Var_Parse_State *, char *, Boolean, Buffer, ClientData); static Boolean VarTail(GNode *, Var_Parse_State *, char *, Boolean, Buffer, ClientData); static Boolean VarSuffix(GNode *, Var_Parse_State *, char *, Boolean, Buffer, ClientData); static Boolean VarRoot(GNode *, Var_Parse_State *, char *, Boolean, Buffer, ClientData); static Boolean VarMatch(GNode *, Var_Parse_State *, char *, Boolean, Buffer, ClientData); #ifdef SYSVVARSUB static Boolean VarSYSVMatch(GNode *, Var_Parse_State *, char *, Boolean, Buffer, ClientData); #endif static Boolean VarNoMatch(GNode *, Var_Parse_State *, char *, Boolean, Buffer, ClientData); #ifndef NO_REGEX static void VarREError(int, regex_t *, const char *); static Boolean VarRESubstitute(GNode *, Var_Parse_State *, char *, Boolean, Buffer, ClientData); #endif static Boolean VarSubstitute(GNode *, Var_Parse_State *, char *, Boolean, Buffer, ClientData); static Boolean VarLoopExpand(GNode *, Var_Parse_State *, char *, Boolean, Buffer, ClientData); static char *VarGetPattern(GNode *, Var_Parse_State *, int, const char **, int, int *, int *, VarPattern *); static char *VarQuote(char *); static char *VarChangeCase(char *, int); static char *VarModify(GNode *, Var_Parse_State *, const char *, Boolean (*)(GNode *, Var_Parse_State *, char *, Boolean, Buffer, ClientData), ClientData); static char *VarOrder(const char *, const char); static char *VarUniq(const char *); static int VarWordCompare(const void *, const void *); static void VarPrintVar(ClientData); #define WR(a) ((char *)UNCONST(a)) /*- *----------------------------------------------------------------------- * VarFind -- * Find the given variable in the given context and any other contexts * indicated. * * Input: * name name to find * ctxt context in which to find it * flags FIND_GLOBAL set means to look in the * VAR_GLOBAL context as well. FIND_CMD set means * to look in the VAR_CMD context also. FIND_ENV * set means to look in the environment * * Results: * A pointer to the structure describing the desired variable or * NIL if the variable does not exist. * * Side Effects: * None *----------------------------------------------------------------------- */ static Var * VarFind(const char *name, GNode *ctxt, int flags) { Hash_Entry *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; } /* * 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 = Hash_FindEntry(&ctxt->context, name); if ((var == NULL) && (flags & FIND_CMD) && (ctxt != VAR_CMD)) { var = Hash_FindEntry(&VAR_CMD->context, name); } if (!checkEnvFirst && (var == NULL) && (flags & FIND_GLOBAL) && (ctxt != VAR_GLOBAL)) { var = Hash_FindEntry(&VAR_GLOBAL->context, name); } if ((var == NULL) && (flags & FIND_ENV)) { char *env; if ((env = getenv(name)) != NULL) { int len; v = emalloc(sizeof(Var)); v->name = estrdup(name); len = strlen(env); v->val = Buf_Init(len); Buf_AddBytes(v->val, len, (Byte *)env); v->flags = VAR_FROM_ENV; return (v); } else if (checkEnvFirst && (flags & FIND_GLOBAL) && (ctxt != VAR_GLOBAL)) { var = Hash_FindEntry(&VAR_GLOBAL->context, name); if (var == NULL) { return ((Var *) NIL); } else { return ((Var *)Hash_GetValue(var)); } } else { return((Var *)NIL); } } else if (var == NULL) { return ((Var *) NIL); } else { return ((Var *)Hash_GetValue(var)); } } /*- *----------------------------------------------------------------------- * VarAdd -- * Add a new variable of name name and value val to the given context * * Input: * name name of variable to add * val value to set it to * ctxt context in which to set it * * 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; int len; Hash_Entry *h; v = emalloc(sizeof(Var)); len = val ? strlen(val) : 0; v->val = Buf_Init(len+1); Buf_AddBytes(v->val, len, (const Byte *)val); v->flags = 0; h = Hash_CreateEntry(&ctxt->context, name, NULL); Hash_SetValue(h, v); v->name = h->name; if (DEBUG(VAR)) { printf("%s:%s = %s\n", ctxt->name, name, val); } } /*- *----------------------------------------------------------------------- * 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) { Hash_Entry *ln; if (DEBUG(VAR)) { printf("%s:delete %s\n", ctxt->name, name); } ln = Hash_FindEntry(&ctxt->context, name); if (ln != NULL) { Var *v; v = (Var *)Hash_GetValue(ln); if (v->name != ln->name) free(v->name); Hash_DeleteEntry(&ctxt->context, ln); Buf_Destroy(v->val, TRUE); free(v); } } /*- *----------------------------------------------------------------------- * Var_Set -- * Set the variable name to the value val in the given context. * * Input: * name name of variable to set * val value to give to the variable * ctxt context in which to set it * * 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 $(<). *----------------------------------------------------------------------- */ void Var_Set(const char *name, const char *val, GNode *ctxt, int flags) { Var *v; const char *cp = name; /* * We only look for a variable in the given context since anything set * here will override anything in a lower context, so there's not much * point in searching them all just to save a bit of memory... */ if ((name = strchr(cp, '$'))) { name = Var_Subst(NULL, cp, ctxt, 0); } else name = cp; v = VarFind(name, ctxt, 0); if (v == (Var *) NIL) { VarAdd(name, val, ctxt); } else { Buf_Discard(v->val, Buf_Size(v->val)); Buf_AddBytes(v->val, strlen(val), (const Byte *)val); if (DEBUG(VAR)) { printf("%s:%s = %s\n", ctxt->name, name, val); } } /* * Any variables given on the command line are automatically exported * to the environment (as per POSIX standard) */ if (ctxt == VAR_CMD && (flags & VAR_NO_EXPORT) == 0) { /* * If requested, don't export these in the environment * individually. We still put them in MAKEOVERRIDES so * that the command-line settings continue to override * Makefile settings. */ if (varNoExportEnv != TRUE) setenv(name, val, 1); Var_Append(MAKEOVERRIDES, name, VAR_GLOBAL); } if (name != cp) free(UNCONST(name)); } /*- *----------------------------------------------------------------------- * Var_Append -- * The variable of the given name has the given value appended to it in * the given context. * * Input: * name name of variable to modify * val String to append to it * ctxt Context in which this should occur * * 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; Hash_Entry *h; const char *cp = name; if ((name = strchr(cp, '$'))) { name = Var_Subst(NULL, cp, ctxt, 0); } else name = cp; v = VarFind(name, ctxt, (ctxt == VAR_GLOBAL) ? FIND_ENV : 0); if (v == (Var *) NIL) { VarAdd(name, val, ctxt); } else { Buf_AddByte(v->val, (Byte)' '); Buf_AddBytes(v->val, strlen(val), (const Byte *)val); if (DEBUG(VAR)) { printf("%s:%s = %s\n", ctxt->name, name, (char *)Buf_GetAll(v->val, (int *)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; h = Hash_CreateEntry(&ctxt->context, name, NULL); Hash_SetValue(h, v); } } if (name != cp) free(UNCONST(name)); } /*- *----------------------------------------------------------------------- * Var_Exists -- * See if the given variable exists. * * Input: * name Variable to find * ctxt Context in which to start search * * Results: * TRUE if it does, FALSE if it doesn't * * Side Effects: * None. * *----------------------------------------------------------------------- */ Boolean Var_Exists(const char *name, GNode *ctxt) { Var *v; v = VarFind(name, ctxt, FIND_CMD|FIND_GLOBAL|FIND_ENV); if (v == (Var *)NIL) { 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 * * Input: * name name to find * ctxt context in which to search for it * * 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; v = VarFind(name, ctxt, FIND_ENV | FIND_GLOBAL | FIND_CMD); *frp = NULL; if (v != (Var *) NIL) { char *p = ((char *)Buf_GetAll(v->val, (int *)NULL)); if (v->flags & VAR_FROM_ENV) { free(v->name); Buf_Destroy(v->val, FALSE); free(v); *frp = p; } return p; } else { return ((char *) NULL); } } /*- *----------------------------------------------------------------------- * VarHead -- * Remove the tail of the given word and place the result in the given * buffer. * * Input: * word Word to trim * addSpace True if need to add a space to the buffer * before sticking in the head * buf Buffer in which to store it * * Results: * TRUE if characters were added to the buffer (a space needs to be * added to the buffer before the next word). * * Side Effects: * The trimmed word is added to the buffer. * *----------------------------------------------------------------------- */ static Boolean VarHead(GNode *ctx __unused, Var_Parse_State *vpstate, char *word, Boolean addSpace, Buffer buf, ClientData dummy) { char *slash; slash = strrchr(word, '/'); if (slash != (char *)NULL) { if (addSpace && vpstate->varSpace) { Buf_AddByte(buf, vpstate->varSpace); } *slash = '\0'; Buf_AddBytes(buf, strlen(word), (Byte *)word); *slash = '/'; return (TRUE); } else { /* * If no directory part, give . (q.v. the POSIX standard) */ if (addSpace && vpstate->varSpace) Buf_AddByte(buf, vpstate->varSpace); Buf_AddByte(buf, (Byte)'.'); } return(dummy ? TRUE : TRUE); } /*- *----------------------------------------------------------------------- * VarTail -- * Remove the head of the given word and place the result in the given * buffer. * * Input: * word Word to trim * addSpace True if need to add a space to the buffer * before adding the tail * buf Buffer in which to store it * * Results: * TRUE if characters were added to the buffer (a space needs to be * added to the buffer before the next word). * * Side Effects: * The trimmed word is added to the buffer. * *----------------------------------------------------------------------- */ static Boolean VarTail(GNode *ctx __unused, Var_Parse_State *vpstate, char *word, Boolean addSpace, Buffer buf, ClientData dummy) { char *slash; if (addSpace && vpstate->varSpace) { Buf_AddByte(buf, vpstate->varSpace); } slash = strrchr(word, '/'); if (slash != (char *)NULL) { *slash++ = '\0'; Buf_AddBytes(buf, strlen(slash), (Byte *)slash); slash[-1] = '/'; } else { Buf_AddBytes(buf, strlen(word), (Byte *)word); } return (dummy ? TRUE : TRUE); } /*- *----------------------------------------------------------------------- * VarSuffix -- * Place the suffix of the given word in the given buffer. * * Input: * word Word to trim * addSpace TRUE if need to add a space before placing the * suffix in the buffer * buf Buffer in which to store it * * Results: * TRUE if characters were added to the buffer (a space needs to be * added to the buffer before the next word). * * Side Effects: * The suffix from the word is placed in the buffer. * *----------------------------------------------------------------------- */ static Boolean VarSuffix(GNode *ctx __unused, Var_Parse_State *vpstate, char *word, Boolean addSpace, Buffer buf, ClientData dummy) { char *dot; dot = strrchr(word, '.'); if (dot != (char *)NULL) { if (addSpace && vpstate->varSpace) { Buf_AddByte(buf, vpstate->varSpace); } *dot++ = '\0'; Buf_AddBytes(buf, strlen(dot), (Byte *)dot); dot[-1] = '.'; addSpace = TRUE; } return (dummy ? addSpace : addSpace); } /*- *----------------------------------------------------------------------- * VarRoot -- * Remove the suffix of the given word and place the result in the * buffer. * * Input: * word Word to trim * addSpace TRUE if need to add a space to the buffer * before placing the root in it * buf Buffer in which to store it * * Results: * TRUE if characters were added to the buffer (a space needs to be * added to the buffer before the next word). * * Side Effects: * The trimmed word is added to the buffer. * *----------------------------------------------------------------------- */ static Boolean VarRoot(GNode *ctx __unused, Var_Parse_State *vpstate, char *word, Boolean addSpace, Buffer buf, ClientData dummy) { char *dot; if (addSpace && vpstate->varSpace) { Buf_AddByte(buf, vpstate->varSpace); } dot = strrchr(word, '.'); if (dot != (char *)NULL) { *dot = '\0'; Buf_AddBytes(buf, strlen(word), (Byte *)word); *dot = '.'; } else { Buf_AddBytes(buf, strlen(word), (Byte *)word); } return (dummy ? TRUE : TRUE); } /*- *----------------------------------------------------------------------- * VarMatch -- * Place the word in the buffer if it matches the given pattern. * Callback function for VarModify to implement the :M modifier. * * Input: * word Word to examine * addSpace TRUE if need to add a space to the buffer * before adding the word, if it matches * buf Buffer in which to store it * pattern Pattern the word must match * * Results: * TRUE if a space should be placed in the buffer before the next * word. * * Side Effects: * The word may be copied to the buffer. * *----------------------------------------------------------------------- */ static Boolean VarMatch(GNode *ctx __unused, Var_Parse_State *vpstate, char *word, Boolean addSpace, Buffer buf, ClientData pattern) { if (Str_Match(word, (char *) pattern)) { if (addSpace && vpstate->varSpace) { Buf_AddByte(buf, vpstate->varSpace); } addSpace = TRUE; Buf_AddBytes(buf, strlen(word), (Byte *)word); } return(addSpace); } #ifdef SYSVVARSUB /*- *----------------------------------------------------------------------- * VarSYSVMatch -- * Place the word in the buffer if it matches the given pattern. * Callback function for VarModify to implement the System V % * modifiers. * * Input: * word Word to examine * addSpace TRUE if need to add a space to the buffer * before adding the word, if it matches * buf Buffer in which to store it * patp Pattern the word must match * * Results: * TRUE if a space should be placed in the buffer before the next * word. * * Side Effects: * The word may be copied to the buffer. * *----------------------------------------------------------------------- */ static Boolean VarSYSVMatch(GNode *ctx, Var_Parse_State *vpstate, char *word, Boolean addSpace, Buffer buf, ClientData patp) { int len; char *ptr; VarPattern *pat = (VarPattern *) patp; char *varexp; if (addSpace && vpstate->varSpace) Buf_AddByte(buf, vpstate->varSpace); addSpace = TRUE; if ((ptr = Str_SYSVMatch(word, pat->lhs, &len)) != NULL) { varexp = Var_Subst(NULL, pat->rhs, ctx, 0); Str_SYSVSubst(buf, varexp, ptr, len); free(varexp); } else { Buf_AddBytes(buf, strlen(word), (Byte *) word); } return(addSpace); } #endif /*- *----------------------------------------------------------------------- * VarNoMatch -- * Place the word in the buffer if it doesn't match the given pattern. * Callback function for VarModify to implement the :N modifier. * * Input: * word Word to examine * addSpace TRUE if need to add a space to the buffer * before adding the word, if it matches * buf Buffer in which to store it * pattern Pattern the word must match * * Results: * TRUE if a space should be placed in the buffer before the next * word. * * Side Effects: * The word may be copied to the buffer. * *----------------------------------------------------------------------- */ static Boolean VarNoMatch(GNode *ctx __unused, Var_Parse_State *vpstate, char *word, Boolean addSpace, Buffer buf, ClientData pattern) { if (!Str_Match(word, (char *) pattern)) { if (addSpace && vpstate->varSpace) { Buf_AddByte(buf, vpstate->varSpace); } addSpace = TRUE; Buf_AddBytes(buf, strlen(word), (Byte *)word); } return(addSpace); } /*- *----------------------------------------------------------------------- * VarSubstitute -- * Perform a string-substitution on the given word, placing the * result in the passed buffer. * * Input: * word Word to modify * addSpace True if space should be added before * other characters * buf Buffer for result * patternp Pattern for substitution * * Results: * TRUE if a space is needed before more characters are added. * * Side Effects: * None. * *----------------------------------------------------------------------- */ static Boolean VarSubstitute(GNode *ctx __unused, Var_Parse_State *vpstate, char *word, Boolean addSpace, Buffer buf, ClientData patternp) { int wordLen; /* Length of word */ char *cp; /* General pointer */ VarPattern *pattern = (VarPattern *) patternp; wordLen = strlen(word); if ((pattern->flags & (VAR_SUB_ONE|VAR_SUB_MATCHED)) != (VAR_SUB_ONE|VAR_SUB_MATCHED)) { /* * Still substituting -- break it down into simple anchored cases * and if none of them fits, perform the general substitution case. */ if ((pattern->flags & VAR_MATCH_START) && (strncmp(word, pattern->lhs, pattern->leftLen) == 0)) { /* * Anchored at start and beginning of word matches pattern */ if ((pattern->flags & VAR_MATCH_END) && (wordLen == pattern->leftLen)) { /* * Also anchored at end and matches to the end (word * is same length as pattern) add space and rhs only * if rhs is non-null. */ if (pattern->rightLen != 0) { if (addSpace && vpstate->varSpace) { Buf_AddByte(buf, vpstate->varSpace); } addSpace = TRUE; Buf_AddBytes(buf, pattern->rightLen, (const Byte *)pattern->rhs); } pattern->flags |= VAR_SUB_MATCHED; } else if (pattern->flags & VAR_MATCH_END) { /* * Doesn't match to end -- copy word wholesale */ goto nosub; } else { /* * Matches at start but need to copy in trailing characters */ if ((pattern->rightLen + wordLen - pattern->leftLen) != 0){ if (addSpace && vpstate->varSpace) { Buf_AddByte(buf, vpstate->varSpace); } addSpace = TRUE; } Buf_AddBytes(buf, pattern->rightLen, (const Byte *)pattern->rhs); Buf_AddBytes(buf, wordLen - pattern->leftLen, (Byte *)(word + pattern->leftLen)); pattern->flags |= VAR_SUB_MATCHED; } } else if (pattern->flags & VAR_MATCH_START) { /* * Had to match at start of word and didn't -- copy whole word. */ goto nosub; } else if (pattern->flags & VAR_MATCH_END) { /* * Anchored at end, Find only place match could occur (leftLen * characters from the end of the word) and see if it does. Note * that because the $ will be left at the end of the lhs, we have * to use strncmp. */ cp = word + (wordLen - pattern->leftLen); if ((cp >= word) && (strncmp(cp, pattern->lhs, pattern->leftLen) == 0)) { /* * Match found. If we will place characters in the buffer, * add a space before hand as indicated by addSpace, then * stuff in the initial, unmatched part of the word followed * by the right-hand-side. */ if (((cp - word) + pattern->rightLen) != 0) { if (addSpace && vpstate->varSpace) { Buf_AddByte(buf, vpstate->varSpace); } addSpace = TRUE; } Buf_AddBytes(buf, cp - word, (const Byte *)word); Buf_AddBytes(buf, pattern->rightLen, (const Byte *)pattern->rhs); pattern->flags |= VAR_SUB_MATCHED; } else { /* * Had to match at end and didn't. Copy entire word. */ goto nosub; } } else { /* * Pattern is unanchored: search for the pattern in the word using * String_FindSubstring, copying unmatched portions and the * right-hand-side for each match found, handling non-global * substitutions correctly, etc. When the loop is done, any * remaining part of the word (word and wordLen are adjusted * accordingly through the loop) is copied straight into the * buffer. * addSpace is set FALSE as soon as a space is added to the * buffer. */ Boolean done; int origSize; done = FALSE; origSize = Buf_Size(buf); while (!done) { cp = Str_FindSubstring(word, pattern->lhs); if (cp != (char *)NULL) { if (addSpace && (((cp - word) + pattern->rightLen) != 0)){ Buf_AddByte(buf, vpstate->varSpace); addSpace = FALSE; } Buf_AddBytes(buf, cp-word, (const Byte *)word); Buf_AddBytes(buf, pattern->rightLen, (const Byte *)pattern->rhs); wordLen -= (cp - word) + pattern->leftLen; word = cp + pattern->leftLen; if (wordLen == 0) { done = TRUE; } if ((pattern->flags & VAR_SUB_GLOBAL) == 0) { done = TRUE; } pattern->flags |= VAR_SUB_MATCHED; } else { done = TRUE; } } if (wordLen != 0) { if (addSpace && vpstate->varSpace) { Buf_AddByte(buf, vpstate->varSpace); } Buf_AddBytes(buf, wordLen, (Byte *)word); } /* * If added characters to the buffer, need to add a space * before we add any more. If we didn't add any, just return * the previous value of addSpace. */ return ((Buf_Size(buf) != origSize) || addSpace); } return (addSpace); } nosub: if (addSpace && vpstate->varSpace) { Buf_AddByte(buf, vpstate->varSpace); } Buf_AddBytes(buf, wordLen, (Byte *)word); return(TRUE); } #ifndef NO_REGEX /*- *----------------------------------------------------------------------- * VarREError -- * Print the error caused by a regcomp or regexec call. * * Results: * None. * * Side Effects: * An error gets printed. * *----------------------------------------------------------------------- */ static 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); } /*- *----------------------------------------------------------------------- * VarRESubstitute -- * Perform a regex substitution on the given word, placing the * result in the passed buffer. * * Results: * TRUE if a space is needed before more characters are added. * * Side Effects: * None. * *----------------------------------------------------------------------- */ static Boolean VarRESubstitute(GNode *ctx __unused, Var_Parse_State *vpstate __unused, char *word, Boolean addSpace, Buffer buf, ClientData patternp) { VarREPattern *pat; int xrv; char *wp; char *rp; int added; int flags = 0; #define MAYBE_ADD_SPACE() \ if (addSpace && !added) \ Buf_AddByte(buf, ' '); \ added = 1 added = 0; wp = word; pat = patternp; if ((pat->flags & (VAR_SUB_ONE|VAR_SUB_MATCHED)) == (VAR_SUB_ONE|VAR_SUB_MATCHED)) xrv = REG_NOMATCH; else { tryagain: xrv = regexec(&pat->re, wp, pat->nsub, pat->matches, flags); } switch (xrv) { case 0: pat->flags |= VAR_SUB_MATCHED; if (pat->matches[0].rm_so > 0) { MAYBE_ADD_SPACE(); Buf_AddBytes(buf, pat->matches[0].rm_so, wp); } for (rp = pat->replace; *rp; rp++) { if ((*rp == '\\') && ((rp[1] == '&') || (rp[1] == '\\'))) { MAYBE_ADD_SPACE(); Buf_AddByte(buf,rp[1]); rp++; } else if ((*rp == '&') || ((*rp == '\\') && isdigit((unsigned char)rp[1]))) { int n; const char *subbuf; int sublen; char errstr[3]; if (*rp == '&') { n = 0; errstr[0] = '&'; errstr[1] = '\0'; } else { n = rp[1] - '0'; errstr[0] = '\\'; errstr[1] = rp[1]; errstr[2] = '\0'; rp++; } if (n > pat->nsub) { Error("No subexpression %s", &errstr[0]); subbuf = ""; sublen = 0; } else if ((pat->matches[n].rm_so == -1) && (pat->matches[n].rm_eo == -1)) { Error("No match for subexpression %s", &errstr[0]); subbuf = ""; sublen = 0; } else { subbuf = wp + pat->matches[n].rm_so; sublen = pat->matches[n].rm_eo - pat->matches[n].rm_so; } if (sublen > 0) { MAYBE_ADD_SPACE(); Buf_AddBytes(buf, sublen, subbuf); } } else { MAYBE_ADD_SPACE(); Buf_AddByte(buf, *rp); } } wp += pat->matches[0].rm_eo; if (pat->flags & VAR_SUB_GLOBAL) { flags |= REG_NOTBOL; if (pat->matches[0].rm_so == 0 && pat->matches[0].rm_eo == 0) { MAYBE_ADD_SPACE(); Buf_AddByte(buf, *wp); wp++; } if (*wp) goto tryagain; } if (*wp) { MAYBE_ADD_SPACE(); Buf_AddBytes(buf, strlen(wp), wp); } break; default: VarREError(xrv, &pat->re, "Unexpected regex error"); /* fall through */ case REG_NOMATCH: if (*wp) { MAYBE_ADD_SPACE(); Buf_AddBytes(buf,strlen(wp),wp); } break; } return(addSpace||added); } #endif /*- *----------------------------------------------------------------------- * VarLoopExpand -- * Implements the :@@@ modifier of ODE make. * We set the temp variable named in pattern.lhs to word and expand * pattern.rhs storing the result in the passed buffer. * * Input: * word Word to modify * addSpace True if space should be added before * other characters * buf Buffer for result * pattern Datafor substitution * * Results: * TRUE if a space is needed before more characters are added. * * Side Effects: * None. * *----------------------------------------------------------------------- */ static Boolean VarLoopExpand(GNode *ctx __unused, Var_Parse_State *vpstate __unused, char *word, Boolean addSpace, Buffer buf, ClientData loopp) { VarLoop_t *loop = (VarLoop_t *) loopp; char *s; int slen; if (word && *word) { Var_Set(loop->tvar, word, loop->ctxt, VAR_NO_EXPORT); s = Var_Subst(NULL, loop->str, loop->ctxt, loop->err); if (s != NULL && *s != '\0') { if (addSpace && *s != '\n') Buf_AddByte(buf, ' '); Buf_AddBytes(buf, (slen = strlen(s)), (Byte *)s); addSpace = (slen > 0 && s[slen - 1] != '\n'); free(s); } } return addSpace; } /*- *----------------------------------------------------------------------- * VarSelectWords -- * Implements the :[start..end] modifier. * This is a special case of VarModify since we want to be able * to scan the list backwards if start > end. * * Input: * str String whose words should be trimmed * seldata words to select * * Results: * A string of all the words selected. * * Side Effects: * None. * *----------------------------------------------------------------------- */ static char * VarSelectWords(GNode *ctx __unused, Var_Parse_State *vpstate, const char *str, VarSelectWords_t *seldata) { 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 */ char *as; /* word list memory */ int ac, i; int start, end, step; buf = Buf_Init(0); addSpace = FALSE; if (vpstate->oneBigWord) { /* fake what brk_string() would do if there were only one word */ ac = 1; av = emalloc((ac + 1) * sizeof(char *)); as = strdup(str); av[0] = as; av[1] = NULL; } else { av = brk_string(str, &ac, FALSE, &as); } /* * Now sanitize seldata. * If seldata->start or seldata->end are negative, convert them to * the positive equivalents (-1 gets converted to argc, -2 gets * converted to (argc-1), etc.). */ if (seldata->start < 0) seldata->start = ac + seldata->start + 1; if (seldata->end < 0) seldata->end = ac + seldata->end + 1; /* * We avoid scanning more of the list than we need to. */ if (seldata->start > seldata->end) { start = MIN(ac, seldata->start) - 1; end = MAX(0, seldata->end - 1); step = -1; } else { start = MAX(0, seldata->start - 1); end = MIN(ac, seldata->end); step = 1; } for (i = start; (step < 0 && i >= end) || (step > 0 && i < end); i += step) { if (av[i] && *av[i]) { if (addSpace && vpstate->varSpace) { Buf_AddByte(buf, vpstate->varSpace); } Buf_AddBytes(buf, strlen(av[i]), (Byte *)av[i]); addSpace = TRUE; } } free(as); free(av); Buf_AddByte(buf, '\0'); as = (char *)Buf_GetAll(buf, (int *)NULL); Buf_Destroy(buf, FALSE); return (as); } /*- *----------------------------------------------------------------------- * VarModify -- * Modify each of the words of the passed string using the given * function. Used to implement all modifiers. * * Input: * str String whose words should be trimmed * modProc Function to use to modify them * datum Datum to pass it * * Results: * A string of all the words modified appropriately. * * Side Effects: * None. * *----------------------------------------------------------------------- */ static char * VarModify(GNode *ctx, Var_Parse_State *vpstate, const char *str, Boolean (*modProc)(GNode *, Var_Parse_State *, char *, Boolean, Buffer, ClientData), ClientData 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 */ char *as; /* word list memory */ int ac, i; buf = Buf_Init(0); addSpace = FALSE; if (vpstate->oneBigWord) { /* fake what brk_string() would do if there were only one word */ ac = 1; av = emalloc((ac + 1) * sizeof(char *)); as = strdup(str); av[0] = as; av[1] = NULL; } else { av = brk_string(str, &ac, FALSE, &as); } for (i = 0; i < ac; i++) { addSpace = (*modProc)(ctx, vpstate, av[i], addSpace, buf, datum); } free(as); free(av); Buf_AddByte(buf, '\0'); as = (char *)Buf_GetAll(buf, (int *)NULL); Buf_Destroy(buf, FALSE); return (as); } static int VarWordCompare(const void *a, const void *b) { int r = strcmp(*(const char * const *)a, *(const char * const *)b); return r; } /*- *----------------------------------------------------------------------- * VarOrder -- * Order the words in the string. * * Input: * str String whose words should be sorted. * otype How to order: s - sort, x - random. * * Results: * A string containing the words ordered. * * Side Effects: * None. * *----------------------------------------------------------------------- */ static char * VarOrder(const char *str, const char otype) { Buffer buf; /* Buffer for the new string */ char **av; /* word list [first word does not count] */ char *as; /* word list memory */ int ac, i; buf = Buf_Init(0); av = brk_string(str, &ac, FALSE, &as); if (ac > 0) switch (otype) { case 's': /* sort alphabetically */ qsort(av, ac, sizeof(char *), VarWordCompare); break; case 'x': /* randomize */ { int rndidx; char *t; /* * We will use [ac..2] range for mod factors. This will produce * random numbers in [(ac-1)..0] interval, and minimal * reasonable value for mod factor is 2 (the mod 1 will produce * 0 with probability 1). */ for (i = ac-1; i > 0; i--) { rndidx = random() % (i + 1); if (i != rndidx) { t = av[i]; av[i] = av[rndidx]; av[rndidx] = t; } } } } /* end of switch */ for (i = 0; i < ac; i++) { Buf_AddBytes(buf, strlen(av[i]), (Byte *) av[i]); if (i != ac - 1) Buf_AddByte(buf, ' '); } free(as); free(av); Buf_AddByte(buf, '\0'); as = (char *)Buf_GetAll(buf, (int *)NULL); Buf_Destroy(buf, FALSE); return (as); } /*- *----------------------------------------------------------------------- * VarUniq -- * Remove adjacent duplicate words. * * Input: * str String whose words should be sorted * * Results: * A string containing the resulting words. * * Side Effects: * None. * *----------------------------------------------------------------------- */ static char * VarUniq(const char *str) { Buffer buf; /* Buffer for new string */ char **av; /* List of words to affect */ char *as; /* Word list memory */ int ac, i, j; buf = Buf_Init(0); av = brk_string(str, &ac, FALSE, &as); if (ac > 1) { for (j = 0, i = 1; i < ac; i++) if (strcmp(av[i], av[j]) != 0 && (++j != i)) av[j] = av[i]; ac = j + 1; } for (i = 0; i < ac; i++) { Buf_AddBytes(buf, strlen(av[i]), (Byte *)av[i]); if (i != ac - 1) Buf_AddByte(buf, ' '); } free(as); free(av); Buf_AddByte(buf, '\0'); as = (char *)Buf_GetAll(buf, (int *)NULL); Buf_Destroy(buf, FALSE); return as; } /*- *----------------------------------------------------------------------- * 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, Var_Parse_State *vpstate __unused, int err, const char **tstr, int delim, int *flags, int *length, VarPattern *pattern) { const char *cp; Buffer buf = Buf_Init(0); int 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; int 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_AddBytes(buf, strlen(cp2), (Byte *) cp2); if (freeIt) free(cp2); cp += len - 1; } else { const 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_AddBytes(buf, cp2 - cp, (const Byte *)cp); cp = --cp2; } else Buf_AddByte(buf, (Byte) *cp); } } } else if (pattern && *cp == '&') Buf_AddBytes(buf, pattern->leftLen, (const Byte *)pattern->lhs); else Buf_AddByte(buf, (Byte) *cp); } Buf_AddByte(buf, (Byte) '\0'); if (*cp != delim) { *tstr = cp; *length = 0; return NULL; } else { char *rstr; *tstr = ++cp; rstr = (char *)Buf_GetAll(buf, length); *length -= 1; /* Don't count the NULL */ Buf_Destroy(buf, FALSE); return rstr; } } /*- *----------------------------------------------------------------------- * VarQuote -- * Quote shell meta-characters in the string * * Results: * The quoted string * * Side Effects: * None. * *----------------------------------------------------------------------- */ static char * VarQuote(char *str) { Buffer buf; /* This should cover most shells :-( */ static char meta[] = "\n \t'`\";&<>()|*?{}[]\\$!#^~"; 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'); str = (char *)Buf_GetAll(buf, (int *)NULL); Buf_Destroy(buf, FALSE); return str; } /*- *----------------------------------------------------------------------- * VarChangeCase -- * Change the string to all uppercase or all lowercase * * Input: * str String to modify * upper TRUE -> uppercase, else lowercase * * Results: * The string with case changed * * Side Effects: * None. * *----------------------------------------------------------------------- */ static char * VarChangeCase(char *str, int upper) { Buffer buf; int (*modProc)(int); modProc = (upper ? toupper : tolower); buf = Buf_Init(MAKE_BSIZE); for (; *str ; str++) { Buf_AddByte(buf, (Byte) modProc(*str)); } Buf_AddByte(buf, (Byte) '\0'); str = (char *)Buf_GetAll(buf, (int *) NULL); Buf_Destroy(buf, FALSE); return str; } /*- *----------------------------------------------------------------------- * Var_Parse -- * Given the start of a variable invocation, extract the variable * name and find its value, then modify it according to the * specification. * * Input: * str The string to parse * ctxt The context for the variable * err TRUE if undefined variables are an error * lengthPtr OUT: The length of the specification * freePtr OUT: TRUE if caller should free result * * 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...?). * A Boolean in *freePtr telling whether the returned string should * be freed by the caller. * * Side Effects: * None. * *----------------------------------------------------------------------- */ char * Var_Parse(const char *str, GNode *ctxt, Boolean err, int *lengthPtr, Boolean *freePtr) { const char *tstr; /* Pointer into str */ Var *v; /* Variable in invocation */ const 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 */ int vlen; /* Length of variable name */ const char *start; char delim; char *nstr; 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 */ Var_Parse_State parsestate; /* Flags passed to helper functions */ *freePtr = FALSE; dynamic = FALSE; start = str; parsestate.oneBigWord = FALSE; parsestate.varSpace = ' '; /* word separator */ 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 *)NIL) { *lengthPtr = 2; 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. */ switch (str[1]) { case '@': return UNCONST("$(.TARGET)"); case '%': return UNCONST("$(.ARCHIVE)"); case '*': return UNCONST("$(.PREFIX)"); case '!': return UNCONST("$(.MEMBER)"); } } /* * Error */ return (err ? var_Error : varNoError); } else { haveModifier = FALSE; tstr = &str[1]; endc = str[1]; } } else { Buffer buf; /* Holds the variable name */ startc = str[1]; endc = startc == '(' ? ')' : '}'; buf = Buf_Init(MAKE_BSIZE); /* * Skip to the end character or a colon, whichever comes first. */ for (tstr = str + 2; *tstr != '\0' && *tstr != endc && *tstr != ':'; tstr++) { /* * A variable inside a variable, expand */ if (*tstr == '$') { int rlen; Boolean rfree; char *rval = Var_Parse(tstr, ctxt, err, &rlen, &rfree); if (rval != NULL) { Buf_AddBytes(buf, strlen(rval), (Byte *) rval); if (rfree) free(rval); } tstr += rlen - 1; } else Buf_AddByte(buf, (Byte) *tstr); } if (*tstr == ':') { haveModifier = TRUE; } else if (*tstr != '\0') { haveModifier = FALSE; } else { /* * 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); } *WR(tstr) = '\0'; Buf_AddByte(buf, (Byte) '\0'); str = Buf_GetAll(buf, (int *) NULL); vlen = strlen(str); v = VarFind(str, ctxt, FIND_ENV | FIND_GLOBAL | FIND_CMD); if ((v == (Var *)NIL) && (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) { case '@': case '%': case '*': case '!': case '>': case '<': { char vname[2]; char *val; /* * Well, it's local -- go look for it. */ vname[0] = *str; vname[1] = '\0'; v = VarFind(vname, ctxt, 0); if (v != (Var *)NIL) { /* * No need for nested expansion or anything, as we're * the only one who sets these things and we sure don't * but nested invocations in them... */ val = (char *)Buf_GetAll(v->val, (int *)NULL); if (str[1] == 'D') { val = VarModify(ctxt, &parsestate, val, VarHead, (ClientData)0); } else { val = VarModify(ctxt, &parsestate, val, VarTail, (ClientData)0); } /* * Resulting string is dynamically allocated, so * tell caller to free it. */ *freePtr = TRUE; *lengthPtr = tstr-start+1; *WR(tstr) = endc; Buf_Destroy(buf, TRUE); return(val); } break; } } } if (v == (Var *)NIL) { 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) { case '@': case '%': case '*': case '!': dynamic = TRUE; break; } } else if ((vlen > 2) && (*str == '.') && 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; *WR(tstr) = endc; if (dynamic) { char *pstr = emalloc(*lengthPtr + 1); strncpy(pstr, start, *lengthPtr); pstr[*lengthPtr] = '\0'; *freePtr = TRUE; Buf_Destroy(buf, TRUE); return(pstr); } 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 = UNCONST(str); v->val = Buf_Init(1); v->flags = VAR_JUNK; Buf_Destroy(buf, FALSE); } } else 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. */ nstr = (char *)Buf_GetAll(v->val, (int *)NULL); if (strchr(nstr, '$') != (char *)NULL) { nstr = Var_Subst(NULL, nstr, 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. * :N words which do not match the given . * :S[1gW] * Substitute for in the value * :C[1gW] * 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). * :O ("Order") Alphabeticaly sort words in variable. * :Ox ("intermiX") Randomize words in variable. * :u ("uniq") Remove adjacent duplicate words. * :tu Converts the variable contents to uppercase. * :tl Converts the variable contents to lowercase. * :ts[c] Sets varSpace - the char used to * separate words to 'c'. If 'c' is * omitted then no separation is used. * :tW Treat the variable contents as a single * word, even if it contains spaces. * (Mnemonic: one big 'W'ord.) * :tw Treat the variable contents as multiple * space-separated words. * (Mnemonic: many small 'w'ords.) * :[index] Select a single word from the value. * :[start..end] Select multiple words from the value. * :[*] or :[0] Select the entire value, as a single * word. Equivalent to :tW. * :[@] Select the entire value, as multiple * words. Undoes the effect of :[*]. * Equivalent to :tw. * :[#] Returns the number of words in the value. * * :?: * If the variable evaluates to true, return * true value, else return the second value. * :lhs=rhs Like :S, but the rhs goes to the end of * the invocation. * :sh Treat the current value as a command * to be run, new value is its output. * The following added so we can handle ODE makefiles. * :@@@ * Assign a temporary local variable * to the current value of each word in turn * and replace each word with the result of * evaluating * :D Use as value if variable defined * :U Use as value if variable undefined * :L Use the name of the variable as the value. * :P Use the path of the node that has the same * name as the variable as the value. This * basically includes an implied :L so that * the common method of refering to the path * of your dependent 'x' in a rule is to use * the form '${x:P}'. * :!! Run cmd much the same as :sh run's the * current value of the variable. * The ::= modifiers, actually assign a value to the variable. * Their main purpose is in supporting modifiers of .for loop * iterators and other obscure uses. They always expand to * nothing. In a target rule that would otherwise expand to an * empty line they can be preceded with @: to keep make happy. * Eg. * * foo: .USE * .for i in ${.TARGET} ${.TARGET:R}.gz * @: ${t::=$i} * @echo blah ${t:T} * .endfor * * ::= Assigns as the new value of variable. * ::?= Assigns as value of variable if * it was not already set. * ::+= Appends to variable. * ::!= Assigns output of as the new value of * variable. */ if ((nstr != (char *)NULL) && haveModifier) { /* * Skip initial colon while putting it back. */ *WR(tstr) = ':'; tstr++; delim = '\0'; while (*tstr && *tstr != endc) { char *newStr; /* New value to return */ char termc; /* Character which terminated scan */ if (DEBUG(VAR)) { printf("Applying :%c to \"%s\"\n", *tstr, nstr); } newStr = var_Error; switch (*tstr) { case ':': { if (tstr[1] == '=' || (tstr[2] == '=' && (tstr[1] == '!' || tstr[1] == '+' || tstr[1] == '?'))) { /* * "::=", "::!=", "::+=", or "::?=" */ GNode *v_ctxt; /* context where v belongs */ const char *emsg; char *sv_name; VarPattern pattern; int how; v_ctxt = ctxt; sv_name = NULL; ++tstr; if (v->flags & VAR_JUNK) { /* * We need to strdup() it incase * VarGetPattern() recurses. */ sv_name = v->name; v->name = strdup(v->name); } else if (ctxt != VAR_GLOBAL) { if (VarFind(v->name, ctxt, 0) == (Var *)NIL) v_ctxt = VAR_GLOBAL; } switch ((how = *tstr)) { case '+': case '?': case '!': cp = &tstr[2]; break; default: cp = ++tstr; break; } /* XXX: appease vi sm: '{' */ delim = '}'; pattern.flags = 0; pattern.rhs = VarGetPattern(ctxt, &parsestate, err, &cp, delim, NULL, &pattern.rightLen, NULL); if (v->flags & VAR_JUNK) { /* restore original name */ free(v->name); v->name = sv_name; } if (pattern.rhs == NULL) goto cleanup; termc = *--cp; delim = '\0'; switch (how) { case '+': Var_Append(v->name, pattern.rhs, v_ctxt); break; case '!': newStr = Cmd_Exec(pattern.rhs, &emsg); if (emsg) Error(emsg, nstr); else Var_Set(v->name, newStr, v_ctxt, 0); if (newStr) free(newStr); break; case '?': if ((v->flags & VAR_JUNK) == 0) break; /* FALLTHROUGH */ default: Var_Set(v->name, pattern.rhs, v_ctxt, 0); break; } free(UNCONST(pattern.rhs)); newStr = var_Error; break; } goto default_case; /* "::" */ } case '@': { VarLoop_t loop; int flags = VAR_NOSUBST; cp = ++tstr; delim = '@'; if ((loop.tvar = VarGetPattern(ctxt, &parsestate, err, &cp, delim, &flags, &loop.tvarLen, NULL)) == NULL) goto cleanup; if ((loop.str = VarGetPattern(ctxt, &parsestate, err, &cp, delim, &flags, &loop.strLen, NULL)) == NULL) goto cleanup; termc = *cp; delim = '\0'; loop.err = err; loop.ctxt = ctxt; newStr = VarModify(ctxt, &parsestate, nstr, VarLoopExpand, (ClientData)&loop); free(loop.tvar); free(loop.str); break; } case 'D': case 'U': { Buffer buf; /* Buffer for patterns */ int wantit; /* want data in buffer */ /* * Pass through tstr looking for 1) escaped delimiters, * '$'s and backslashes (place the escaped character in * uninterpreted) and 2) unescaped $'s that aren't before * the delimiter (expand the variable substitution). * The result is left in the Buffer buf. */ buf = Buf_Init(0); for (cp = tstr + 1; *cp != endc && *cp != ':' && *cp != '\0'; cp++) { if ((*cp == '\\') && ((cp[1] == ':') || (cp[1] == '$') || (cp[1] == endc) || (cp[1] == '\\'))) { Buf_AddByte(buf, (Byte) cp[1]); cp++; } else if (*cp == '$') { /* * If unescaped dollar sign, assume it's a * variable substitution and recurse. */ char *cp2; int len; Boolean freeIt; cp2 = Var_Parse(cp, ctxt, err, &len, &freeIt); Buf_AddBytes(buf, strlen(cp2), (Byte *) cp2); if (freeIt) free(cp2); cp += len - 1; } else { Buf_AddByte(buf, (Byte) *cp); } } Buf_AddByte(buf, (Byte) '\0'); termc = *cp; if (*tstr == 'U') wantit = ((v->flags & VAR_JUNK) != 0); else wantit = ((v->flags & VAR_JUNK) == 0); if ((v->flags & VAR_JUNK) != 0) v->flags |= VAR_KEEP; if (wantit) { newStr = (char *)Buf_GetAll(buf, (int *)NULL); Buf_Destroy(buf, FALSE); } else { newStr = nstr; Buf_Destroy(buf, TRUE); } break; } case 'L': { if ((v->flags & VAR_JUNK) != 0) v->flags |= VAR_KEEP; newStr = strdup(v->name); cp = ++tstr; termc = *tstr; break; } case 'P': { GNode *gn; if ((v->flags & VAR_JUNK) != 0) v->flags |= VAR_KEEP; gn = Targ_FindNode(v->name, TARG_NOCREATE); if (gn == NILGNODE || gn->path == NULL) newStr = strdup(v->name); else newStr = strdup(gn->path); cp = ++tstr; termc = *tstr; break; } case '!': { const char *emsg; VarPattern pattern; pattern.flags = 0; delim = '!'; cp = ++tstr; if ((pattern.rhs = VarGetPattern(ctxt, &parsestate, err, &cp, delim, NULL, &pattern.rightLen, NULL)) == NULL) goto cleanup; newStr = Cmd_Exec(pattern.rhs, &emsg); free(UNCONST(pattern.rhs)); if (emsg) Error(emsg, nstr); termc = *cp; delim = '\0'; if (v->flags & VAR_JUNK) { v->flags |= VAR_KEEP; } break; } case '[': { /* * Look for the closing ']', recursively * expanding any embedded variables. * * estr is a pointer to the expanded result, * which we must free(). */ char *estr; cp = tstr+1; /* point to char after '[' */ delim = ']'; /* look for closing ']' */ estr = VarGetPattern(ctxt, &parsestate, err, &cp, delim, NULL, NULL, NULL); if (estr == NULL) goto cleanup; /* report missing ']' */ /* now cp points just after the closing ']' */ delim = '\0'; if (cp[0] != ':' && cp[0] != endc) { /* Found junk after ']' */ free(estr); goto bad_modifier; } if (estr[0] == '\0') { /* Found empty square brackets in ":[]". */ free(estr); goto bad_modifier; } else if (estr[0] == '#' && estr[1] == '\0') { /* Found ":[#]" */ /* * We will need enough space for the decimal * representation of an int. We calculate the * space needed for the octal representation, * and add enough slop to cope with a '-' sign * (which should never be needed) and a '\0' * string terminator. */ int newStrSize = (sizeof(int) * CHAR_BIT + 2) / 3 + 2; newStr = emalloc(newStrSize); if (parsestate.oneBigWord) { strncpy(newStr, "1", newStrSize); } else { /* XXX: brk_string() is a rather expensive * way of counting words. */ char **av; char *as; int ac; av = brk_string(nstr, &ac, FALSE, &as); snprintf(newStr, newStrSize, "%d", ac); free(as); free(av); } termc = *cp; free(estr); break; } else if (estr[0] == '*' && estr[1] == '\0') { /* Found ":[*]" */ parsestate.oneBigWord = TRUE; newStr = nstr; termc = *cp; free(estr); break; } else if (estr[0] == '@' && estr[1] == '\0') { /* Found ":[@]" */ parsestate.oneBigWord = FALSE; newStr = nstr; termc = *cp; free(estr); break; } else { /* * We expect estr to contain a single * integer for :[N], or two integers * separated by ".." for :[start..end]. */ char *ep; VarSelectWords_t seldata = { 0, 0 }; seldata.start = strtol(estr, &ep, 0); if (ep == estr) { /* Found junk instead of a number */ free(estr); goto bad_modifier; } else if (ep[0] == '\0') { /* Found only one integer in :[N] */ seldata.end = seldata.start; } else if (ep[0] == '.' && ep[1] == '.' && ep[2] != '\0') { /* Expecting another integer after ".." */ ep += 2; seldata.end = strtol(ep, &ep, 0); if (ep[0] != '\0') { /* Found junk after ".." */ free(estr); goto bad_modifier; } } else { /* Found junk instead of ".." */ free(estr); goto bad_modifier; } /* * Now seldata is properly filled in, * but we still have to check for 0 as * a special case. */ if (seldata.start == 0 && seldata.end == 0) { /* ":[0]" or perhaps ":[0..0]" */ parsestate.oneBigWord = TRUE; newStr = nstr; termc = *cp; free(estr); break; } else if (seldata.start == 0 || seldata.end == 0) { /* ":[0..N]" or ":[N..0]" */ free(estr); goto bad_modifier; } /* * Normal case: select the words * described by seldata. */ newStr = VarSelectWords(ctxt, &parsestate, nstr, &seldata); termc = *cp; free(estr); break; } } case 't': { cp = tstr + 1; /* make sure it is set */ if (tstr[1] != endc && tstr[1] != ':') { if (tstr[1] == 's') { /* * Use the char (if any) at tstr[2] * as the word separator. */ VarPattern pattern; if (tstr[2] != endc && (tstr[3] == endc || tstr[3] == ':')) { /* ":ts" or * ":ts:" */ parsestate.varSpace = tstr[2]; cp = tstr + 3; } else if (tstr[2] == endc || tstr[2] == ':') { /* ":ts" or ":ts:" */ parsestate.varSpace = 0; /* no separator */ cp = tstr + 2; } else if (tstr[2] == '\\') { switch (tstr[3]) { case 'n': parsestate.varSpace = '\n'; cp = tstr + 4; break; case 't': parsestate.varSpace = '\t'; cp = tstr + 4; break; default: if (isdigit((unsigned char)tstr[3])) { char *ep; parsestate.varSpace = strtoul(&tstr[3], &ep, 0); if (*ep != ':' && *ep != endc) goto bad_modifier; cp = ep; } else { /* * ":ts". */ goto bad_modifier; } break; } } else { /* * Found ":ts". */ goto bad_modifier; } termc = *cp; /* * We cannot be certain that VarModify * will be used - even if there is a * subsequent modifier, so do a no-op * VarSubstitute now to for str to be * re-expanded without the spaces. */ pattern.flags = VAR_SUB_ONE; pattern.lhs = pattern.rhs = "\032"; pattern.leftLen = pattern.rightLen = 1; newStr = VarModify(ctxt, &parsestate, nstr, VarSubstitute, (ClientData)&pattern); } else if (tstr[2] == endc || tstr[2] == ':') { /* * Check for two-character options: * ":tu", ":tl" */ if (tstr[1] == 'u' || tstr[1] == 'l') { newStr = VarChangeCase(nstr, (tstr[1] == 'u')); cp = tstr + 2; termc = *cp; } else if (tstr[1] == 'W' || tstr[1] == 'w') { parsestate.oneBigWord = (tstr[1] == 'W'); newStr = nstr; cp = tstr + 2; termc = *cp; } else { /* Found ":t:" or * ":t". */ goto bad_modifier; } } else { /* * Found ":t". */ goto bad_modifier; } } else { /* * Found ":t" or ":t:". */ goto bad_modifier; } break; } case 'N': case 'M': { char *pattern; char *cp2; Boolean copy; int nest; copy = FALSE; nest = 1; /* * In the loop below, ignore ':' unless we are at * (or back to) the original brace level. * XXX This will likely not work right if $() and ${} * are intermixed. */ for (cp = tstr + 1; *cp != '\0' && !(*cp == ':' && nest == 1); cp++) { if (*cp == '\\' && (cp[1] == ':' || cp[1] == endc || cp[1] == startc)) { copy = TRUE; cp++; continue; } if (*cp == startc) ++nest; if (*cp == endc) { --nest; if (nest == 0) break; } } termc = *cp; *WR(cp) = '\0'; if (copy) { /* * Need to compress the \:'s out of the pattern, so * allocate enough room to hold the uncompressed * pattern (note that cp started at tstr+1, so * cp - tstr takes the null byte into account) and * compress the pattern into the space. */ pattern = emalloc(cp - tstr); for (cp2 = pattern, cp = tstr + 1; *cp != '\0'; cp++, cp2++) { if ((*cp == '\\') && (cp[1] == ':' || cp[1] == endc)) { cp++; } *cp2 = *cp; } *cp2 = '\0'; } else { pattern = UNCONST(&tstr[1]); } if ((cp2 = strchr(pattern, '$'))) { cp2 = pattern; pattern = Var_Subst(NULL, cp2, ctxt, err); if (copy) free(cp2); copy = TRUE; } if (*tstr == 'M' || *tstr == 'm') { newStr = VarModify(ctxt, &parsestate, nstr, VarMatch, (ClientData)pattern); } else { newStr = VarModify(ctxt, &parsestate, nstr, VarNoMatch, (ClientData)pattern); } if (copy) { free(pattern); } break; } case 'S': { VarPattern pattern; Var_Parse_State tmpparsestate; pattern.flags = 0; tmpparsestate = parsestate; delim = 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; } cp = tstr; if ((pattern.lhs = VarGetPattern(ctxt, &parsestate, err, &cp, delim, &pattern.flags, &pattern.leftLen, NULL)) == NULL) goto cleanup; if ((pattern.rhs = VarGetPattern(ctxt, &parsestate, err, &cp, delim, NULL, &pattern.rightLen, &pattern)) == NULL) goto cleanup; /* * Check for global substitution. If 'g' after the final * delimiter, substitution is global and is marked that * way. */ for (;; cp++) { switch (*cp) { case 'g': pattern.flags |= VAR_SUB_GLOBAL; continue; case '1': pattern.flags |= VAR_SUB_ONE; continue; case 'W': tmpparsestate.oneBigWord = TRUE; continue; } break; } termc = *cp; newStr = VarModify(ctxt, &tmpparsestate, nstr, VarSubstitute, (ClientData)&pattern); /* * Free the two strings. */ free(UNCONST(pattern.lhs)); free(UNCONST(pattern.rhs)); delim = '\0'; break; } case '?': { VarPattern pattern; Boolean value; /* find ':', and then substitute accordingly */ pattern.flags = 0; cp = ++tstr; delim = ':'; if ((pattern.lhs = VarGetPattern(ctxt, &parsestate, err, &cp, delim, NULL, &pattern.leftLen, NULL)) == NULL) goto cleanup; /* '{' or '(' */ delim = endc; if ((pattern.rhs = VarGetPattern(ctxt, &parsestate, err, &cp, delim, NULL, &pattern.rightLen, NULL)) == NULL) goto cleanup; /* XXX: appease vi sm: ')' '}' */ termc = *--cp; delim = '\0'; if (Cond_EvalExpression(1, v->name, &value, 0) == COND_INVALID) { Error("Bad conditional expression `%s' in %s?%s:%s", v->name, v->name, pattern.lhs, pattern.rhs); goto cleanup; } if (value) { newStr = UNCONST(pattern.lhs); free(UNCONST(pattern.rhs)); } else { newStr = UNCONST(pattern.rhs); free(UNCONST(pattern.lhs)); } if (v->flags & VAR_JUNK) { v->flags |= VAR_KEEP; } break; } #ifndef NO_REGEX case 'C': { VarREPattern pattern; char *re; int error; Var_Parse_State tmpparsestate; pattern.flags = 0; tmpparsestate = parsestate; delim = tstr[1]; tstr += 2; cp = tstr; if ((re = VarGetPattern(ctxt, &parsestate, err, &cp, delim, NULL, NULL, NULL)) == NULL) goto cleanup; if ((pattern.replace = VarGetPattern(ctxt, &parsestate, err, &cp, delim, NULL, NULL, NULL)) == NULL){ free(re); goto cleanup; } for (;; cp++) { switch (*cp) { case 'g': pattern.flags |= VAR_SUB_GLOBAL; continue; case '1': pattern.flags |= VAR_SUB_ONE; continue; case 'W': tmpparsestate.oneBigWord = TRUE; continue; } 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(ctxt, &tmpparsestate, nstr, VarRESubstitute, (ClientData) &pattern); regfree(&pattern.re); free(pattern.replace); free(pattern.matches); delim = '\0'; break; } #endif case 'Q': if (tstr[1] == endc || tstr[1] == ':') { newStr = VarQuote(nstr); cp = tstr + 1; termc = *cp; break; } goto default_case; case 'T': if (tstr[1] == endc || tstr[1] == ':') { newStr = VarModify(ctxt, &parsestate, nstr, VarTail, (ClientData)0); cp = tstr + 1; termc = *cp; break; } goto default_case; case 'H': if (tstr[1] == endc || tstr[1] == ':') { newStr = VarModify(ctxt, &parsestate, nstr, VarHead, (ClientData)0); cp = tstr + 1; termc = *cp; break; } goto default_case; case 'E': if (tstr[1] == endc || tstr[1] == ':') { newStr = VarModify(ctxt, &parsestate, nstr, VarSuffix, (ClientData)0); cp = tstr + 1; termc = *cp; break; } goto default_case; case 'R': if (tstr[1] == endc || tstr[1] == ':') { newStr = VarModify(ctxt, &parsestate, nstr, VarRoot, (ClientData)0); cp = tstr + 1; termc = *cp; break; } goto default_case; case 'O': { char otype; cp = tstr + 1; /* skip to the rest in any case */ if (tstr[1] == endc || tstr[1] == ':') { otype = 's'; termc = *cp; } else if ( (tstr[1] == 'x') && (tstr[2] == endc || tstr[2] == ':') ) { otype = tstr[1]; cp = tstr + 2; termc = *cp; } else { goto bad_modifier; } newStr = VarOrder(nstr, otype); break; } case 'u': if (tstr[1] == endc || tstr[1] == ':') { newStr = VarUniq(nstr); cp = tstr + 1; termc = *cp; break; } goto default_case; #ifdef SUNSHCMD case 's': if (tstr[1] == 'h' && (tstr[2] == endc || tstr[2] == ':')) { const char *emsg; newStr = Cmd_Exec(nstr, &emsg); if (emsg) Error(emsg, nstr); cp = tstr + 2; termc = *cp; break; } goto default_case; #endif default: default_case: { #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. */ delim='='; cp = tstr; if ((pattern.lhs = VarGetPattern(ctxt, &parsestate, err, &cp, delim, &pattern.flags, &pattern.leftLen, NULL)) == NULL) goto cleanup; delim = endc; if ((pattern.rhs = VarGetPattern(ctxt, &parsestate, err, &cp, delim, NULL, &pattern.rightLen, &pattern)) == NULL) goto cleanup; /* * SYSV modifications happen through the whole * string. Note the pattern is anchored at the end. */ termc = *--cp; delim = '\0'; newStr = VarModify(ctxt, &parsestate, nstr, VarSYSVMatch, (ClientData)&pattern); free(UNCONST(pattern.lhs)); free(UNCONST(pattern.rhs)); } else #endif { Error("Unknown modifier '%c'", *tstr); for (cp = tstr+1; *cp != ':' && *cp != endc && *cp != '\0'; cp++) continue; termc = *cp; newStr = var_Error; } } } if (DEBUG(VAR)) { printf("Result is \"%s\"\n", newStr); } if (newStr != nstr) { if (*freePtr) { free(nstr); } nstr = newStr; if (nstr != var_Error && nstr != varNoError) { *freePtr = TRUE; } else { *freePtr = FALSE; } } if (termc == '\0') { Error("Unclosed variable specification for %s", v->name); } else if (termc == ':') { *WR(cp) = termc; cp++; } else { *WR(cp) = termc; } tstr = cp; } *lengthPtr = tstr - start + 1; } else { *lengthPtr = tstr - start + 1; *WR(tstr) = endc; } if (v->flags & VAR_FROM_ENV) { Boolean destroy = FALSE; if (nstr != (char *)Buf_GetAll(v->val, (int *)NULL)) { destroy = TRUE; } else { /* * Returning the value unmodified, so tell the caller to free * the thing. */ *freePtr = TRUE; } if (nstr != (char *)Buf_GetAll(v->val, (int *)NULL)) Buf_Destroy(v->val, destroy); free(v->name); 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 VAR_KEEP is also set then we want to keep str as is. */ if (!(v->flags & VAR_KEEP)) { if (*freePtr) { free(nstr); } *freePtr = FALSE; if (dynamic) { nstr = emalloc(*lengthPtr + 1); strncpy(nstr, start, *lengthPtr); nstr[*lengthPtr] = '\0'; *freePtr = TRUE; } else { nstr = var_Error; } } if (nstr != (char *)Buf_GetAll(v->val, (int *)NULL)) Buf_Destroy(v->val, TRUE); free(v->name); free(v); } return (nstr); bad_modifier: /* "{(" */ Error("Bad modifier `:%.*s' for %s", (int)strcspn(tstr, ":)}"), tstr, v->name); cleanup: *lengthPtr = cp - start + 1; if (*freePtr) free(nstr); if (delim != '\0') Error("Unclosed substitution for %s (%c missing)", v->name, delim); return (var_Error); } /*- *----------------------------------------------------------------------- * 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. * * Input: * var Named variable || NULL for all * str the string which to substitute * ctxt the context wherein to find variables * undefErr TRUE if undefineds are an error * * Results: * The resulting string. * * Side Effects: * None. The old string must be freed by the caller *----------------------------------------------------------------------- */ char * Var_Subst(const char *var, const char *str, GNode *ctxt, Boolean undefErr) { Buffer buf; /* Buffer for forming things */ char *val; /* Value to substitute for a variable */ int length; /* Length of the variable invocation */ Boolean trailingBslash; /* variable ends in \ */ Boolean doFree; /* Set true if val should be freed */ 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; trailingBslash = FALSE; while (*str) { if (*str == '\n' && trailingBslash) Buf_AddByte(buf, ' '); 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 != '$') { /* * Skip as many characters as possible -- either to the end of * the string or to the next dollar sign (variable invocation). */ const char *cp; for (cp = str++; *str != '$' && *str != '\0'; str++) continue; Buf_AddBytes(buf, str - cp, (const Byte *)cp); } else { if (var != NULL) { int expand; for (;;) { if (str[1] != '(' && str[1] != '{') { if (str[1] != *var || strlen(var) > 1) { Buf_AddBytes(buf, 2, (const Byte *)str); str += 2; expand = FALSE; } else expand = TRUE; break; } else { const 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_AddBytes(buf, p - str, (const Byte *)str); 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_AddBytes(buf, p - str, (const Byte *)str); 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. */ length = strlen(val); Buf_AddBytes(buf, length, (Byte *)val); trailingBslash = length > 0 && val[length - 1] == '\\'; if (doFree) { free(val); } } } } Buf_AddByte(buf, '\0'); val = (char *)Buf_GetAll(buf, (int *)NULL); Buf_Destroy(buf, FALSE); return (val); } /*- *----------------------------------------------------------------------- * Var_GetTail -- * Return the tail from each of a list of words. Used to set the * System V local variables. * * Input: * file Filename to modify * * Results: * The resulting string. * * Side Effects: * None. * *----------------------------------------------------------------------- */ #if 0 char * Var_GetTail(char *file) { return(VarModify(file, VarTail, (ClientData)0)); } /*- *----------------------------------------------------------------------- * 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. * * Input: * file Filename to manipulate * * Results: * The leading components. * * Side Effects: * None. * *----------------------------------------------------------------------- */ char * Var_GetHead(char *file) { return(VarModify(file, VarHead, (ClientData)0)); } #endif /*- *----------------------------------------------------------------------- * 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"); } void Var_End(void) { } /****************** PRINT DEBUGGING INFO *****************/ static void VarPrintVar(ClientData vp) { Var *v = (Var *) vp; printf("%-16s = %s\n", v->name, (char *)Buf_GetAll(v->val, (int *)NULL)); } /*- *----------------------------------------------------------------------- * Var_Dump -- * print all variables in a context *----------------------------------------------------------------------- */ void Var_Dump(GNode *ctxt) { Hash_Search search; Hash_Entry *h; for (h = Hash_EnumFirst(&ctxt->context, &search); h != NULL; h = Hash_EnumNext(&search)) { VarPrintVar(Hash_GetValue(h)); } }