File: [local] / src / usr.bin / make / var.c (download)
Revision 1.29, Sat Jan 8 09:45:16 2000 UTC (24 years, 4 months ago) by espie
Branch: MAIN
Changes since 1.28: +5 -5 lines
Finish changing all Var_Parse arguments to size_t. Thanks to millert@
for reminding me.
|
/* $OpenBSD: var.c,v 1.29 2000/01/08 09:45:16 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 1.29 2000/01/08 09:45:16 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 <ctype.h>
#ifndef MAKE_BOOTSTRAP
#include <sys/types.h>
#include <regex.h>
#endif
#include <stdlib.h>
#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((ClientData, ClientData));
static Var *VarFind __P((char *, GNode *, int));
static Var *VarAdd __P((char *, char *, GNode *));
static void VarDelete __P((ClientData));
static Boolean VarHead __P((char *, Boolean, Buffer, ClientData));
static Boolean VarTail __P((char *, Boolean, Buffer, ClientData));
static Boolean VarSuffix __P((char *, Boolean, Buffer, ClientData));
static Boolean VarRoot __P((char *, Boolean, Buffer, ClientData));
static Boolean VarMatch __P((char *, Boolean, Buffer, ClientData));
#ifdef SYSVVARSUB
static Boolean VarSYSVMatch __P((char *, Boolean, Buffer, ClientData));
#endif
static Boolean VarNoMatch __P((char *, Boolean, Buffer, ClientData));
#ifndef MAKE_BOOTSTRAP
static void VarREError __P((int, regex_t *, const char *));
static Boolean VarRESubstitute __P((char *, Boolean, Buffer, ClientData));
#endif
static Boolean VarSubstitute __P((char *, Boolean, Buffer, ClientData));
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,
ClientData),
ClientData));
static int VarPrintVar __P((ClientData, ClientData));
static Boolean VarUppercase __P((char *word, Boolean addSpace, Buffer buf, ClientData dummy));
static Boolean VarLowercase __P((char *word, Boolean addSpace, Buffer buf, ClientData 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)
ClientData v; /* VAR structure to compare */
ClientData 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, (ClientData)name);
if ((var == NULL) && (flags & FIND_CMD) && (ctxt != VAR_CMD))
var = Lst_Find(VAR_CMD->context, VarCmp, (ClientData)name);
if (!checkEnvFirst && (var == NULL) && (flags & FIND_GLOBAL) &&
(ctxt != VAR_GLOBAL)) {
var = Lst_Find(VAR_GLOBAL->context, VarCmp, (ClientData)name);
}
if ((var == NULL) && (flags & FIND_ENV)) {
var = Lst_Find(VAR_ENV->context, VarCmp, (ClientData)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, (ClientData)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, (ClientData)v);
Lst_AtEnd(allVars, (ClientData)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)
ClientData 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, (ClientData)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((ClientData) 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 */
ClientData 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 */
ClientData 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 */
ClientData 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 */
ClientData 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 */
ClientData 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 */
ClientData 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 */
ClientData 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 */
ClientData 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 */
ClientData 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 */
ClientData 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;
ClientData 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, ClientData));
ClientData 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, (ClientData)0);
} else {
val = VarModify(val, VarTail, (ClientData)0);
}
/*
* 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<pattern> words which match the given <pattern>.
* <pattern> is of the standard file
* wildcarding form.
* :S<d><pat1><d><pat2><d>[g]
* Substitute <pat2> for <pat1> in the value
* :C<d><pat1><d><pat2><d>[g]
* Substitute <pat2> for regex <pat1> 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, (ClientData)pattern);
} else {
newStr = VarModify(str, VarNoMatch,
(ClientData)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,
(ClientData)&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,
(ClientData) &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, (ClientData)0);
cp = tstr + 1;
termc = *cp;
break;
}
/*FALLTHRU*/
case 'H':
if (tstr[1] == endc || tstr[1] == ':') {
newStr = VarModify (str, VarHead, (ClientData)0);
cp = tstr + 1;
termc = *cp;
break;
}
/*FALLTHRU*/
case 'E':
if (tstr[1] == endc || tstr[1] == ':') {
newStr = VarModify (str, VarSuffix, (ClientData)0);
cp = tstr + 1;
termc = *cp;
break;
}
/*FALLTHRU*/
case 'R':
if (tstr[1] == endc || tstr[1] == ':') {
newStr = VarModify (str, VarRoot, (ClientData)0);
cp = tstr + 1;
termc = *cp;
break;
}
/*FALLTHRU*/
case 'U':
if (tstr[1] == endc || tstr[1] == ':') {
newStr = VarModify (str, VarUppercase, (ClientData)0);
cp = tstr + 1;
termc = *cp;
break;
}
/*FALLTHRU*/
case 'L':
if (tstr[1] == endc || tstr[1] == ':') {
newStr = VarModify (str, VarLowercase, (ClientData)0);
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: <string1>=<string2>)
*/
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,
(ClientData)&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, (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.
*
* Results:
* The leading components.
*
* Side Effects:
* None.
*
*-----------------------------------------------------------------------
*/
char *
Var_GetHead(file)
char *file; /* Filename to manipulate */
{
return(VarModify(file, VarHead, (ClientData)0));
}
/*-
*-----------------------------------------------------------------------
* 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 int
VarPrintVar(vp, dummy)
ClientData vp;
ClientData dummy;
{
Var *v = (Var *) vp;
printf("%-16s = %s\n", v->name, VarValue(v));
return (dummy ? 0 : 0);
}
/*-
*-----------------------------------------------------------------------
* Var_Dump --
* print all variables in a context
*-----------------------------------------------------------------------
*/
void
Var_Dump (ctxt)
GNode *ctxt;
{
Lst_ForEach (ctxt->context, VarPrintVar, (ClientData) 0);
}
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