/* $OpenBSD: var.c,v 1.32 2000/06/10 01:41:06 espie Exp $ */ /* $NetBSD: var.c,v 1.18 1997/03/18 19:24:46 christos Exp $ */ /* * Copyright (c) 1999 Marc Espie. * * Extensive code modifications for the OpenBSD project. * * 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. * * THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT 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 OPENBSD * PROJECT 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) 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. */ #ifndef lint #if 0 static char sccsid[] = "@(#)var.c 8.3 (Berkeley) 3/19/94"; #else static char rcsid[] = "$OpenBSD: var.c,v 1.32 2000/06/10 01:41:06 espie Exp $"; #endif #endif /* not lint */ /*- * 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 #ifndef MAKE_BOOTSTRAP #include #include #endif #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 */ static GNode *VAR_ENV; /* variables read from env */ static Lst allVars; /* List of all variables */ #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_JUNK 4 /* Variable is a junk variable that * should be destroyed when done with * it. Used by Var_Parse for undefined, * modified variables */ } 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 */ typedef struct { char *lhs; /* String to match */ size_t leftLen; /* Length of string */ char *rhs; /* Replacement string (w/ &'s removed) */ size_t rightLen; /* Length of replacement */ int flags; } VarPattern; #ifndef MAKE_BOOTSTRAP typedef struct { regex_t re; int nsub; regmatch_t *matches; char *replace; int flags; } VarREPattern; #endif #define VarValue(v) Buf_Retrieve(&((v)->val)) static int VarCmp __P((void *, void *)); static Var *VarFind __P((char *, GNode *, int)); static Var *VarAdd __P((char *, char *, GNode *)); static void VarDelete __P((void *)); static Boolean VarHead __P((char *, Boolean, Buffer, void *)); static Boolean VarTail __P((char *, Boolean, Buffer, void *)); static Boolean VarSuffix __P((char *, Boolean, Buffer, void *)); static Boolean VarRoot __P((char *, Boolean, Buffer, void *)); static Boolean VarMatch __P((char *, Boolean, Buffer, void *)); #ifdef SYSVVARSUB static Boolean VarSYSVMatch __P((char *, Boolean, Buffer, void *)); #endif static Boolean VarNoMatch __P((char *, Boolean, Buffer, void *)); #ifndef MAKE_BOOTSTRAP static void VarREError __P((int, regex_t *, const char *)); static Boolean VarRESubstitute __P((char *, Boolean, Buffer, void *)); #endif static Boolean VarSubstitute __P((char *, Boolean, Buffer, void *)); static char *VarGetPattern __P((GNode *, int, char **, int, int *, size_t *, VarPattern *)); static char *VarQuote __P((char *)); static char *VarModify __P((char *, Boolean (*)(char *, Boolean, Buffer, void *), void *)); static void VarPrintVar __P((void *)); static Boolean VarUppercase __P((char *word, Boolean addSpace, Buffer buf, void *dummy)); static Boolean VarLowercase __P((char *word, Boolean addSpace, Buffer buf, void *dummy)); /*- *----------------------------------------------------------------------- * 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(v, name) void *v; /* VAR structure to compare */ void *name; /* name to look for */ { return strcmp((char *)name, ((Var *)v)->name); } /*- *----------------------------------------------------------------------- * VarFind -- * Find the given variable in the given context and any other contexts * indicated. * * Results: * A pointer to the structure describing the desired variable or * NULL if the variable does not exist. * * Side Effects: * Caches env variables in the VAR_ENV context. *----------------------------------------------------------------------- */ static Var * VarFind (name, ctxt, flags) char *name; /* name to find */ GNode *ctxt; /* context in which to find it */ int 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/VAR_ENV context. */ { 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; } /* * 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, VarCmp, name); if ((var == NULL) && (flags & FIND_CMD) && (ctxt != VAR_CMD)) var = Lst_Find(VAR_CMD->context, VarCmp, name); if (!checkEnvFirst && (var == NULL) && (flags & FIND_GLOBAL) && (ctxt != VAR_GLOBAL)) { var = Lst_Find(VAR_GLOBAL->context, VarCmp, name); } if ((var == NULL) && (flags & FIND_ENV)) { var = Lst_Find(VAR_ENV->context, VarCmp, name); if (var == NULL) { char *env; if ((env = getenv(name)) != NULL) return VarAdd(name, env, VAR_ENV); } } if (var == NULL && checkEnvFirst && (flags & FIND_GLOBAL) && (ctxt != VAR_GLOBAL)) var = Lst_Find(VAR_GLOBAL->context, VarCmp, name); if (var == NULL) return NULL; else return (Var *)Lst_Datum(var); } /*- *----------------------------------------------------------------------- * VarAdd -- * Add a new variable of name name and value val to the given context * * Results: * The added variable * * 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 Var * VarAdd(name, val, ctxt) char *name; /* name of variable to add */ char *val; /* value to set it to */ GNode *ctxt; /* context in which to set it */ { register Var *v; int len; v = (Var *) emalloc (sizeof (Var)); v->name = estrdup (name); len = val ? strlen(val) : 0; Buf_Init(&(v->val), len+1); Buf_AddChars(&(v->val), len, val); v->flags = 0; Lst_AtFront(ctxt->context, v); Lst_AtEnd(allVars, v); if (DEBUG(VAR)) { printf("%s:%s = %s\n", ctxt->name, name, val); } return v; } /*- *----------------------------------------------------------------------- * VarDelete -- * Delete a variable and all the space associated with it. * * Results: * None * * Side Effects: * None *----------------------------------------------------------------------- */ static void VarDelete(vp) void *vp; { Var *v = (Var *) vp; free(v->name); Buf_Destroy(&(v->val)); free(v); } /*- *----------------------------------------------------------------------- * Var_Delete -- * Remove a variable from a context. * * Results: * None. * * Side Effects: * The Var structure is removed and freed. * *----------------------------------------------------------------------- */ void Var_Delete(name, ctxt) char *name; GNode *ctxt; { LstNode ln; if (DEBUG(VAR)) { printf("%s:delete %s\n", ctxt->name, name); } ln = Lst_Find(ctxt->context, VarCmp, name); if (ln != NULL) { register Var *v; v = (Var *)Lst_Datum(ln); Lst_Remove(ctxt->context, ln); ln = Lst_Member(allVars, v); Lst_Remove(allVars, ln); VarDelete(v); } } /*- *----------------------------------------------------------------------- * 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 (name, val, ctxt) char *name; /* name of variable to set */ char *val; /* value to give to the variable */ GNode *ctxt; /* context in which to set it */ { register Var *v; /* * 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... */ v = VarFind (name, ctxt, 0); if (v == NULL) { (void)VarAdd(name, val, ctxt); } else { Buf_Reset(&(v->val)); Buf_AddString(&(v->val), 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). * We put them into the env cache directly. * (Note that additions to VAR_CMD occur very early, so VAR_ENV is * actually empty at this point). */ if (ctxt == VAR_CMD) { setenv(name, val, 1); (void)VarAdd(name, val, VAR_ENV); } } /*- *----------------------------------------------------------------------- * 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 (name, val, ctxt) char *name; /* Name of variable to modify */ char *val; /* String to append to it */ GNode *ctxt; /* Context in which this should occur */ { register Var *v; v = VarFind (name, ctxt, (ctxt == VAR_GLOBAL) ? FIND_ENV : 0); if (v == NULL) { (void)VarAdd(name, val, ctxt); } else { Buf_AddSpace(&(v->val)); Buf_AddString(&(v->val), val); if (DEBUG(VAR)) { printf("%s:%s = %s\n", ctxt->name, name, VarValue(v)); } } } /*- *----------------------------------------------------------------------- * Var_Exists -- * See if the given variable exists. * * Results: * TRUE if it does, FALSE if it doesn't * * Side Effects: * None. * *----------------------------------------------------------------------- */ Boolean Var_Exists(name, ctxt) char *name; /* Variable to find */ GNode *ctxt; /* Context in which to start search */ { Var *v; v = VarFind(name, ctxt, FIND_CMD|FIND_GLOBAL|FIND_ENV); if (v == NULL) return FALSE; else 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(name, ctxt) char *name; /* name to find */ GNode *ctxt; /* context in which to search for it */ { Var *v; v = VarFind(name, ctxt, FIND_ENV | FIND_GLOBAL | FIND_CMD); if (v != NULL) return VarValue(v); else return NULL; } /*- *----------------------------------------------------------------------- * VarUppercase -- * Place the Upper cased word in the given buffer. * * 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 word is added to the buffer. * *----------------------------------------------------------------------- */ static Boolean VarUppercase (word, addSpace, buf, dummy) char *word; /* Word to Upper Case */ Boolean addSpace; /* True if need to add a space to the buffer * before sticking in the head */ Buffer buf; /* Buffer in which to store it */ void *dummy; { size_t len = strlen(word); if (addSpace) Buf_AddSpace(buf); while (len--) Buf_AddChar(buf, toupper(*word++)); return (TRUE); } /*- *----------------------------------------------------------------------- * VarLowercase -- * Place the Lower cased word in the given buffer. * * 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 word is added to the buffer. * *----------------------------------------------------------------------- */ static Boolean VarLowercase (word, addSpace, buf, dummy) char *word; /* Word to Lower Case */ Boolean addSpace; /* True if need to add a space to the buffer * before sticking in the head */ Buffer buf; /* Buffer in which to store it */ void *dummy; { size_t len = strlen(word); if (addSpace) Buf_AddSpace(buf); while (len--) Buf_AddChar(buf, tolower(*word++)); return (TRUE); } /*- *----------------------------------------------------------------------- * VarHead -- * Remove the tail of the given word and place the result in the given * buffer. * * 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(word, addSpace, buf, dummy) char *word; /* Word to trim */ Boolean addSpace; /* True if need to add a space to the buffer * before sticking in the head */ Buffer buf; /* Buffer in which to store it */ void *dummy; { register char *slash; slash = strrchr(word, '/'); if (slash != NULL) { if (addSpace) Buf_AddSpace(buf); Buf_AddInterval(buf, word, slash); return (TRUE); } else { /* If no directory part, give . (q.v. the POSIX standard) */ if (addSpace) Buf_AddString(buf, " ."); else Buf_AddChar(buf, '.'); } return(dummy ? TRUE : TRUE); } /*- *----------------------------------------------------------------------- * VarTail -- * Remove the head of the given word and place the result in the given * buffer. * * 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(word, addSpace, buf, dummy) char *word; /* Word to trim */ Boolean addSpace; /* TRUE if need to stick a space in the * buffer before adding the tail */ Buffer buf; /* Buffer in which to store it */ void *dummy; { register char *slash; if (addSpace) Buf_AddSpace(buf); slash = strrchr(word, '/'); if (slash != NULL) Buf_AddString(buf, slash+1); else Buf_AddString(buf, word); return (dummy ? TRUE : TRUE); } /*- *----------------------------------------------------------------------- * VarSuffix -- * Place the suffix of the given word in the given buffer. * * 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(word, addSpace, buf, dummy) char *word; /* Word to trim */ Boolean addSpace; /* TRUE if need to add a space before placing * the suffix in the buffer */ Buffer buf; /* Buffer in which to store it */ void *dummy; { char *dot; dot = strrchr(word, '.'); if (dot != NULL) { if (addSpace) Buf_AddSpace(buf); Buf_AddString(buf, dot+1); addSpace = TRUE; } return (dummy ? addSpace : addSpace); } /*- *----------------------------------------------------------------------- * VarRoot -- * Remove the suffix of the given word and place the result in the * buffer. * * 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(word, addSpace, buf, dummy) char *word; /* Word to trim */ Boolean addSpace; /* TRUE if need to add a space to the buffer * before placing the root in it */ Buffer buf; /* Buffer in which to store it */ void *dummy; { char *dot; if (addSpace) Buf_AddSpace(buf); dot = strrchr(word, '.'); if (dot != NULL) Buf_AddInterval(buf, word, dot); else Buf_AddString(buf, 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. * * 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(word, addSpace, buf, pattern) char *word; /* Word to examine */ Boolean addSpace; /* TRUE if need to add a space to the * buffer before adding the word, if it * matches */ Buffer buf; /* Buffer in which to store it */ void *pattern; /* Pattern the word must match */ { if (Str_Match(word, (char *) pattern)) { if (addSpace) Buf_AddSpace(buf); addSpace = TRUE; Buf_AddString(buf, 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. * * 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(word, addSpace, buf, patp) char *word; /* Word to examine */ Boolean addSpace; /* TRUE if need to add a space to the * buffer before adding the word, if it * matches */ Buffer buf; /* Buffer in which to store it */ void *patp; /* Pattern the word must match */ { int len; char *ptr; VarPattern *pat = (VarPattern *) patp; if (*word) { if (addSpace) Buf_AddSpace(buf); addSpace = TRUE; if ((ptr = Str_SYSVMatch(word, pat->lhs, &len)) != NULL) Str_SYSVSubst(buf, pat->rhs, ptr, len); else Buf_AddString(buf, 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. * * 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(word, addSpace, buf, pattern) char *word; /* Word to examine */ Boolean addSpace; /* TRUE if need to add a space to the * buffer before adding the word, if it * matches */ Buffer buf; /* Buffer in which to store it */ void *pattern; /* Pattern the word must match */ { if (!Str_Match(word, (char *) pattern)) { if (addSpace) Buf_AddSpace(buf); addSpace = TRUE; Buf_AddString(buf, word); } return(addSpace); } /*- *----------------------------------------------------------------------- * VarSubstitute -- * Perform a string-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 VarSubstitute(word, addSpace, buf, patternp) char *word; /* Word to modify */ Boolean addSpace; /* True if space should be added before * other characters */ Buffer buf; /* Buffer for result */ void *patternp; /* Pattern for substitution */ { register size_t wordLen; /* Length of word */ register 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) Buf_AddSpace(buf); addSpace = TRUE; Buf_AddChars(buf, pattern->rightLen, 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) Buf_AddSpace(buf); addSpace = TRUE; } Buf_AddChars(buf, pattern->rightLen, pattern->rhs); Buf_AddChars(buf, wordLen - pattern->leftLen, 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) Buf_AddSpace(buf); addSpace = TRUE; } Buf_AddInterval(buf, word, cp); Buf_AddChars(buf, pattern->rightLen, 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. */ register Boolean done; size_t origSize; done = FALSE; origSize = Buf_Size(buf); while (!done) { cp = strstr(word, pattern->lhs); if (cp != (char *)NULL) { if (addSpace && (((cp - word) + pattern->rightLen) != 0)){ Buf_AddSpace(buf); addSpace = FALSE; } Buf_AddInterval(buf, word, cp); Buf_AddChars(buf, pattern->rightLen, pattern->rhs); wordLen -= (cp - word) + pattern->leftLen; word = cp + pattern->leftLen; if (wordLen == 0 || (pattern->flags & VAR_SUB_GLOBAL) == 0){ done = TRUE; } pattern->flags |= VAR_SUB_MATCHED; } else { done = TRUE; } } if (wordLen != 0) { if (addSpace) Buf_AddSpace(buf); Buf_AddChars(buf, wordLen, 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) Buf_AddSpace(buf); Buf_AddChars(buf, wordLen, word); return(TRUE); } #ifndef MAKE_BOOTSTRAP /*- *----------------------------------------------------------------------- * VarREError -- * Print the error caused by a regcomp or regexec call. * * Results: * None. * * Side Effects: * An error gets printed. * *----------------------------------------------------------------------- */ static void VarREError(err, pat, str) 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(word, addSpace, buf, patternp) char *word; Boolean addSpace; Buffer buf; void *patternp; { VarREPattern *pat; int xrv; char *wp; char *rp; int added; #define MAYBE_ADD_SPACE() \ if (addSpace && !added) \ Buf_AddSpace(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, 0); } switch (xrv) { case 0: pat->flags |= VAR_SUB_MATCHED; if (pat->matches[0].rm_so > 0) { MAYBE_ADD_SPACE(); Buf_AddChars(buf, pat->matches[0].rm_so, wp); } for (rp = pat->replace; *rp; rp++) { if ((*rp == '\\') && ((rp[1] == '&') || (rp[1] == '\\'))) { MAYBE_ADD_SPACE(); Buf_AddChar(buf, rp[1]); rp++; } else if ((*rp == '&') || ((*rp == '\\') && isdigit(rp[1]))) { int n; 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_AddChars(buf, sublen, subbuf); } } else { MAYBE_ADD_SPACE(); Buf_AddChar(buf, *rp); } } wp += pat->matches[0].rm_eo; if (pat->flags & VAR_SUB_GLOBAL) goto tryagain; if (*wp) { MAYBE_ADD_SPACE(); Buf_AddChars(buf, strlen(wp), wp); } break; default: VarREError(xrv, &pat->re, "Unexpected regex error"); /* fall through */ case REG_NOMATCH: if (*wp) { MAYBE_ADD_SPACE(); Buf_AddChars(buf, strlen(wp), wp); } break; } return(addSpace||added); } #endif /*- *----------------------------------------------------------------------- * 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 (str, modProc, datum) char *str; /* String whose words should be trimmed */ /* Function to use to modify them */ Boolean (*modProc) __P((char *, Boolean, Buffer, void *)); void *datum; /* Datum to pass it */ { 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_Init(&buf, 0); addSpace = FALSE; av = brk_string(str, &ac, FALSE, &as); for (i = 0; i < ac; i++) addSpace = (*modProc)(av[i], addSpace, &buf, datum); free(as); free(av); return Buf_Retrieve(&buf); } /*- *----------------------------------------------------------------------- * 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). * 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(ctxt, err, tstr, delim, flags, length, pattern) GNode *ctxt; int err; char **tstr; int delim; int *flags; size_t *length; VarPattern *pattern; { char *cp; BUFFER buf; size_t junk; Buf_Init(&buf, 0); 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, $, and \, but don't * touch other backslashes. */ for (cp = *tstr; *cp && (*cp != delim); cp++) { if (IS_A_MATCH(cp, delim)) { Buf_AddChar(&buf, cp[1]); cp++; } else if (*cp == '$') { if (cp[1] == delim) { if (flags == NULL) Buf_AddChar(&buf, *cp); else /* * Unescaped $ at end of pattern => anchor * pattern at end. */ *flags |= VAR_MATCH_END; } else { 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_AddString(&buf, cp2); if (freeIt) free(cp2); cp += len - 1; } } else if (pattern && *cp == '&') Buf_AddChars(&buf, pattern->leftLen, pattern->lhs); else Buf_AddChar(&buf, *cp); } if (*cp != delim) { *tstr = cp; *length = 0; return NULL; } else { *tstr = ++cp; *length = Buf_Size(&buf); return Buf_Retrieve(&buf); } } /*- *----------------------------------------------------------------------- * VarQuote -- * Quote shell meta-characters in the string * * Results: * The quoted string * * Side Effects: * None. * *----------------------------------------------------------------------- */ static char * VarQuote(str) char *str; { BUFFER buf; /* This should cover most shells :-( */ static char meta[] = "\n \t'`\";&<>()|*?{}[]\\$!#^~"; Buf_Init(&buf, MAKE_BSIZE); for (; *str; str++) { if (strchr(meta, *str) != NULL) Buf_AddChar(&buf, '\\'); Buf_AddChar(&buf, *str); } return Buf_Retrieve(&buf); } /*- *----------------------------------------------------------------------- * 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...?). * A Boolean in *freePtr telling whether the returned string should * be freed by the caller. * * Side Effects: * None. * *----------------------------------------------------------------------- */ char * Var_Parse (str, ctxt, err, lengthPtr, freePtr) char *str; /* The string to parse */ GNode *ctxt; /* The context for the variable */ Boolean err; /* TRUE if undefined variables are an error */ size_t *lengthPtr; /* OUT: The length of the specification */ Boolean *freePtr; /* OUT: TRUE if caller should free result */ { register 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 */ register char endc; /* Ending character when variable in parens * or braces */ register 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 */ *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 == NULL) { *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("$(.TARGET)"); case '%': return("$(.ARCHIVE)"); case '*': return("$(.PREFIX)"); case '!': return("$(.MEMBER)"); } } /* * Error */ return (err ? var_Error : varNoError); } else { haveModifier = FALSE; tstr = &str[1]; endc = str[1]; } } else { startc = str[1]; endc = startc == '(' ? ')' : '}'; /* * Skip to the end character or a colon, whichever comes first. */ for (tstr = str + 2; *tstr != '\0' && *tstr != endc && *tstr != ':'; tstr++) { continue; } 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); } *tstr = '\0'; v = VarFind (str + 2, ctxt, FIND_ENV | FIND_GLOBAL | FIND_CMD); if ((v == NULL) && (ctxt != VAR_CMD) && (ctxt != VAR_GLOBAL) && ((tstr-str) == 4) && (str[3] == 'F' || str[3] == '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[2]) { case '@': case '%': case '*': case '!': case '>': case '<': { char vname[2]; char *val; /* * Well, it's local -- go look for it. */ vname[0] = str[2]; vname[1] = '\0'; v = VarFind(vname, ctxt, 0); if (v != NULL) { /* * 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 = VarValue(v); if (str[3] == 'D') { val = VarModify(val, VarHead, NULL); } else { val = VarModify(val, VarTail, NULL); } /* * Resulting string is dynamically allocated, so * tell caller to free it. */ *freePtr = TRUE; *lengthPtr = tstr-start+1; *tstr = endc; return(val); } break; } } } if (v == NULL) { if ((((tstr-str) == 3) || ((((tstr-str) == 4) && (str[3] == 'F' || str[3] == '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[2]) { case '@': case '%': case '*': case '!': dynamic = TRUE; break; } } else if (((tstr-str) > 4) && (str[2] == '.') && isupper((unsigned char) str[3]) && ((ctxt == VAR_CMD) || (ctxt == VAR_GLOBAL))) { int len; len = (tstr-str) - 3; if ((strncmp(str+2, ".TARGET", len) == 0) || (strncmp(str+2, ".ARCHIVE", len) == 0) || (strncmp(str+2, ".PREFIX", len) == 0) || (strncmp(str+2, ".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; return(str); } else { 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 = (Var *) emalloc(sizeof(Var)); v->name = &str[1]; Buf_Init(&(v->val), 1); v->flags = VAR_JUNK; } } } 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 = VarValue(v); if (strchr (str, '$') != (char *)NULL) { str = Var_Subst(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. */ if ((str != (char *)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 */ if (DEBUG(VAR)) { printf("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; pattern.flags = 0; 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, err, &cp, delim, &pattern.flags, &pattern.leftLen, NULL)) == NULL) goto cleanup; if ((pattern.rhs = VarGetPattern(ctxt, 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; } break; } termc = *cp; newStr = VarModify(str, VarSubstitute, &pattern); /* * Free the two strings. */ free(pattern.lhs); free(pattern.rhs); break; } #ifndef MAKE_BOOTSTRAP 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) goto cleanup; if ((pattern.replace = VarGetPattern(ctxt, 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; } 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; } #endif case 'Q': if (tstr[1] == endc || tstr[1] == ':') { newStr = VarQuote (str); cp = tstr + 1; termc = *cp; break; } /*FALLTHRU*/ case 'T': if (tstr[1] == endc || tstr[1] == ':') { newStr = VarModify(str, VarTail, NULL); cp = tstr + 1; termc = *cp; break; } /*FALLTHRU*/ case 'H': if (tstr[1] == endc || tstr[1] == ':') { newStr = VarModify(str, VarHead, NULL); cp = tstr + 1; termc = *cp; break; } /*FALLTHRU*/ case 'E': if (tstr[1] == endc || tstr[1] == ':') { newStr = VarModify(str, VarSuffix, NULL); cp = tstr + 1; termc = *cp; break; } /*FALLTHRU*/ case 'R': if (tstr[1] == endc || tstr[1] == ':') { newStr = VarModify(str, VarRoot, NULL); cp = tstr + 1; termc = *cp; break; } /*FALLTHRU*/ case 'U': if (tstr[1] == endc || tstr[1] == ':') { newStr = VarModify(str, VarUppercase, NULL); cp = tstr + 1; termc = *cp; break; } /*FALLTHRU*/ case 'L': if (tstr[1] == endc || tstr[1] == ':') { newStr = VarModify(str, VarLowercase, NULL); cp = tstr + 1; termc = *cp; break; } /*FALLTHRU*/ #ifdef SUNSHCMD case 's': if (tstr[1] == 'h' && (tstr[2] == endc || tstr[2] == ':')) { char *err; newStr = Cmd_Exec (str, &err); if (err) Error (err, 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. */ for (cp = tstr; *cp != '='; cp++) continue; pattern.lhs = tstr; pattern.leftLen = cp - tstr; *cp++ = '\0'; pattern.rhs = cp; cnt = 1; while (cnt) { if (*cp == endc) cnt--; else if (*cp == startc) cnt++; if (cnt) cp++; } pattern.rightLen = cp - pattern.rhs; *cp = '\0'; /* * SYSV modifications happen through the whole * string. Note the pattern is anchored at the end. */ newStr = VarModify(str, VarSYSVMatch, &pattern); /* * Restore the nulled characters */ pattern.lhs[pattern.leftLen] = '='; pattern.rhs[pattern.rightLen] = endc; 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; } } } if (DEBUG(VAR)) { printf("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_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; Buf_Destroy(&(v->val)); 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); cleanup: *lengthPtr = cp - start + 1; if (*freePtr) free(str); Error("Unclosed substitution for %s (%c missing)", v->name, delim); return (var_Error); } /*- *----------------------------------------------------------------------- * Var_Subst -- * Substitute for all variables in a string in a 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(str, ctxt, undefErr) char *str; /* the string in which to substitute */ GNode *ctxt; /* the context wherein to find variables */ Boolean undefErr; /* TRUE if undefineds are an error */ { BUFFER buf; /* Buffer for forming things */ static Boolean errorReported; /* Set true if an error has already * been reported to prevent a plethora * of messages when recursing */ Buf_Init(&buf, MAKE_BSIZE); errorReported = FALSE; for (;;) { 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 */ const char *cp; /* copy uninteresting stuff */ for (cp = str; *str != '\0' && *str != '$'; str++) ; Buf_AddInterval(&buf, cp, str); if (*str == '\0') break; if (str[1] == '$') { /* A dollar sign may be escaped with another dollar sign. */ Buf_AddChar(&buf, '$'); str += 2; 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_AddChar(&buf, *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_AddString(&buf, val); if (doFree) free(val); } } return Buf_Retrieve(&buf); } /*- *----------------------------------------------------------------------- * Var_SubstVar -- * Substitute for one variable in the given string in the given context * If undefErr is TRUE, Parse_Error will be called when an undefined * variable is encountered. * * Side Effects: * Append the result to the buffer *----------------------------------------------------------------------- */ void Var_SubstVar(buf, str, var, ctxt) Buffer buf; /* Where to store the result */ char *str; /* The string in which to substitute */ const char *var; /* Named variable */ GNode *ctxt; /* The context wherein to find variables */ { char *val; /* Value substituted for a variable */ size_t length; /* Length of the variable invocation */ Boolean doFree; /* Set true if val should be freed */ for (;;) { const char *cp; /* copy uninteresting stuff */ for (cp = str; *str != '\0' && *str != '$'; str++) ; Buf_AddInterval(buf, cp, str); if (*str == '\0') break; if (str[1] == '$') { Buf_AddString(buf, "$$"); str += 2; continue; } if (str[1] != '(' && str[1] != '{') { if (str[1] != *var || var[1] != '\0') { Buf_AddChars(buf, 2, str); str += 2; continue; } } else { char *p; char endc; if (str[1] == '(') endc = ')'; else if (str[1] == '{') endc = '}'; /* Find the end of the variable specification. */ p = str+2; while (*p != '\0' && *p != ':' && *p != endc && *p != '$') p++; /* A variable inside the variable. We don't know how to * expand the external variable at this point, so we try * again with the nested variable. */ if (*p == '$') { Buf_AddInterval(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. */ Buf_AddInterval(buf, str, p); str = p; continue; } } /* okay, so we've found the variable we want to expand. */ val = Var_Parse(str, ctxt, FALSE, &length, &doFree); /* 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_AddString(buf, val); if (doFree) free(val); } } /*- *----------------------------------------------------------------------- * 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(file) char *file; /* Filename to modify */ { return VarModify(file, VarTail, 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(file) char *file; /* Filename to manipulate */ { return VarModify(file, VarHead, NULL); } /*- *----------------------------------------------------------------------- * Var_Init -- * Initialize the module * * Results: * None * * Side Effects: * The VAR_CMD and VAR_GLOBAL contexts are created *----------------------------------------------------------------------- */ void Var_Init () { VAR_GLOBAL = Targ_NewGN("Global"); VAR_CMD = Targ_NewGN("Command"); VAR_ENV = Targ_NewGN("Environment"); allVars = Lst_Init(); } void Var_End () { Lst_Destroy(allVars, VarDelete); } /****************** PRINT DEBUGGING INFO *****************/ static void VarPrintVar(vp) void *vp; { Var *v = (Var *)vp; printf("%-16s = %s\n", v->name, VarValue(v)); } /*- *----------------------------------------------------------------------- * Var_Dump -- * print all variables in a context *----------------------------------------------------------------------- */ void Var_Dump (ctxt) GNode *ctxt; { Lst_Every(ctxt->context, VarPrintVar); }