File: [local] / src / usr.bin / make / var.c (download)
Revision 1.52, Fri Mar 2 16:57:26 2001 UTC (23 years, 2 months ago) by espie
Branch: MAIN
CVS Tags: OPENBSD_2_9_BASE, OPENBSD_2_9
Changes since 1.51: +21 -21 lines
Use the ohash_* that's now in libc.
|
/* $OpenBSD: var.c,v 1.52 2001/03/02 16:57:26 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.
*/
/*-
* 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_SubstVar Substitute a named variable in a string using
* the given context as the top-most one,
* accumulating the result into a user-supplied
* buffer.
*
* 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 <stddef.h>
#include "make.h"
#include "buf.h"
#include "ohash.h"
#include "hashconsts.h"
#include "varmodifiers.h"
#ifndef lint
#if 0
static char sccsid[] = "@(#)var.c 8.3 (Berkeley) 3/19/94";
#else
UNUSED
static char rcsid[] = "$OpenBSD: var.c,v 1.52 2001/03/02 16:57:26 espie Exp $";
#endif
#endif /* not lint */
static SymTable *CTXT_GLOBAL, *CTXT_CMD, *CTXT_ENV;
static char *varnames[] = {
TARGET,
OODATE,
ALLSRC,
IMPSRC,
PREFIX,
ARCHIVE,
MEMBER };
/*
* 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.
*/
GSymT *VAR_GLOBAL; /* variables from the makefile */
GSymT *VAR_CMD; /* variables defined on the command-line */
static GSymT *VAR_ENV; /* variables read from env */
#define FIND_MINE 0x1 /* look in CTXT_CMD and CTXT_GLOBAL */
#define FIND_ENV 0x2 /* look in the environment */
typedef struct Var_ {
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 */
char name[1]; /* the variable's name */
} Var;
static struct ohash_info var_info = {
offsetof(Var, name),
NULL, hash_alloc, hash_free, element_alloc };
static int quick_lookup __P((const char *, const char **, u_int32_t *));
#define VarValue(v) Buf_Retrieve(&((v)->val))
static Var *varfind __P((const char *, const char *, SymTable *, int, int, u_int32_t));
static Var *VarFind_interval __P((const char *, const char *, SymTable *, int));
#define VarFind(n, ctxt, flags) VarFind_interval(n, NULL, ctxt, flags)
static Var *VarAdd __P((const char *, const char *, GSymT *));
static void VarDelete __P((void *));
static void VarPrintVar __P((void *));
static const char *context_name __P((GSymT *));
static Var *new_var __P((const char *, const char *));
static Var *getvar __P((GSymT *, const char *, const char *, u_int32_t));
static Var *var_name_with_dollar __P((char *, char **, SymTable *, Boolean, char));
void
SymTable_Init(ctxt)
SymTable *ctxt;
{
static SymTable sym_template;
memcpy(ctxt, &sym_template, sizeof(*ctxt));
}
void
SymTable_Destroy(ctxt)
SymTable *ctxt;
{
int i;
for (i = 0; i < LOCAL_SIZE; i++)
if (ctxt->locals[i] != NULL)
VarDelete(ctxt->locals[i]);
}
static int
quick_lookup(name, end, pk)
const char *name;
const char **end;
u_int32_t *pk;
{
size_t len;
*pk = ohash_interval(name, end);
len = *end - name;
/* substitute short version for long local name */
switch (*pk % MAGICSLOTS) { /* MAGICSLOTS should be the */
case K_LONGALLSRC % MAGICSLOTS: /* smallest constant yielding */
/* distinct case values */
if (*pk == K_LONGALLSRC && strncmp(name, LONGALLSRC, len) == 0 &&
len == strlen(LONGALLSRC))
return ALLSRC_INDEX;
break;
case K_LONGARCHIVE % MAGICSLOTS:
if (*pk == K_LONGARCHIVE && strncmp(name, LONGARCHIVE, len) == 0 &&
len == strlen(LONGARCHIVE))
return ARCHIVE_INDEX;
break;
case K_LONGIMPSRC % MAGICSLOTS:
if (*pk == K_LONGIMPSRC && strncmp(name, LONGIMPSRC, len) == 0 &&
len == strlen(LONGIMPSRC))
return IMPSRC_INDEX;
break;
case K_LONGMEMBER % MAGICSLOTS:
if (*pk == K_LONGMEMBER && strncmp(name, LONGMEMBER, len) == 0 &&
len == strlen(LONGMEMBER))
return MEMBER_INDEX;
break;
case K_LONGOODATE % MAGICSLOTS:
if (*pk == K_LONGOODATE && strncmp(name, LONGOODATE, len) == 0 &&
len == strlen(LONGOODATE))
return OODATE_INDEX;
break;
case K_LONGPREFIX % MAGICSLOTS:
if (*pk == K_LONGPREFIX && strncmp(name, LONGPREFIX, len) == 0 &&
len == strlen(LONGPREFIX))
return PREFIX_INDEX;
break;
case K_LONGTARGET % MAGICSLOTS:
if (*pk == K_LONGTARGET && strncmp(name, LONGTARGET, len) == 0 &&
len == strlen(LONGTARGET))
return TARGET_INDEX;
break;
case K_TARGET % MAGICSLOTS:
if (name[0] == TARGET[0] && len == 1)
return TARGET_INDEX;
break;
case K_OODATE % MAGICSLOTS:
if (name[0] == OODATE[0] && len == 1)
return OODATE_INDEX;
break;
case K_ALLSRC % MAGICSLOTS:
if (name[0] == ALLSRC[0] && len == 1)
return ALLSRC_INDEX;
break;
case K_IMPSRC % MAGICSLOTS:
if (name[0] == IMPSRC[0] && len == 1)
return IMPSRC_INDEX;
break;
case K_PREFIX % MAGICSLOTS:
if (name[0] == PREFIX[0] && len == 1)
return PREFIX_INDEX;
break;
case K_ARCHIVE % MAGICSLOTS:
if (name[0] == ARCHIVE[0] && len == 1)
return ARCHIVE_INDEX;
break;
case K_MEMBER % MAGICSLOTS:
if (name[0] == MEMBER[0] && len == 1)
return MEMBER_INDEX;
break;
default:
break;
}
return -1;
}
void
Varq_Set(idx, val, gn)
int idx;
const char *val;
GNode *gn;
{
/* 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... */
Var *v = gn->context.locals[idx];
if (v == NULL) {
v = new_var(varnames[idx], val);
v->flags = 0;
gn->context.locals[idx] = v;
} else {
Buf_Reset(&(v->val));
Buf_AddString(&(v->val), val);
}
if (DEBUG(VAR))
printf("%s:%s = %s\n", gn->name, varnames[idx], val);
}
void
Varq_Append(idx, val, gn)
int idx;
const char *val;
GNode *gn;
{
Var *v = gn->context.locals[idx];
if (v == NULL) {
v = new_var(varnames[idx], val);
v->flags = 0;
gn->context.locals[idx] = v;
} else {
Buf_AddSpace(&(v->val));
Buf_AddString(&(v->val), val);
}
if (DEBUG(VAR))
printf("%s:%s = %s\n", gn->name, varnames[idx], VarValue(v));
}
char *
Varq_Value(idx, gn)
int idx;
GNode *gn;
{
Var *v = gn->context.locals[idx];
if (v != NULL)
return VarValue(v);
else
return NULL;
}
Boolean
Varq_Exists(idx, gn)
int idx;
GNode *gn;
{
return gn->context.locals[idx] != NULL;
}
static const char *
context_name(ctxt)
GSymT *ctxt;
{
if (ctxt == VAR_GLOBAL)
return "Global";
else if (ctxt == VAR_CMD)
return "Command";
else
return "Environment";
}
/* Create a variable, to pass to VarAdd. */
static Var *
new_var(name, val)
const char *name;
const char *val;
{
Var *v;
const char *end = NULL;
v = ohash_create_entry(&var_info, name, &end);
if (val != NULL) {
size_t len = strlen(val);
Buf_Init(&(v->val), len+1);
Buf_AddChars(&(v->val), len, val);
} else
Buf_Init(&(v->val), 1);
return v;
}
static Var *
getvar(ctxt, name, end, k)
GSymT *ctxt;
const char *name;
const char *end;
u_int32_t k;
{
return ohash_find(ctxt, ohash_lookup_interval(ctxt, name, end, k));
}
/*-
*-----------------------------------------------------------------------
* VarFind_interval --
* Find the given variable in the given context and any other contexts
* indicated. if end is NULL, name is a string, otherwise, only
* the interval name - end is concerned.
*
* 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_interval(name, end, ctxt, flags)
const char *name; /* name to find */
const char *end; /* end of name */
SymTable *ctxt; /* context in which to find it */
int flags; /* FIND_MINE set means to look in the
* CTXT_GLOBAL and CTXT_CMD contexts also.
* FIND_ENV set means to look in the
* environment */
{
int idx;
u_int32_t k;
idx = quick_lookup(name, &end, &k);
return varfind(name, end, ctxt, flags, idx, k);
}
static Var *
varfind(name, end, ctxt, flags, idx, k)
const char *name;
const char *end;
SymTable *ctxt;
int flags;
int idx;
u_int32_t k;
{
Var *v;
/*
* 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'
*/
if (ctxt == NULL)
v = NULL;
else if (ctxt == CTXT_GLOBAL || ctxt == CTXT_CMD || ctxt == CTXT_ENV)
v = getvar((GSymT *)ctxt, name, end, k);
else {
if (idx == -1)
v = NULL;
else
v = ctxt->locals[idx];
}
if (v != NULL)
return v;
if ((flags & FIND_MINE) && ctxt != CTXT_CMD)
v = getvar(VAR_CMD, name, end, k);
if (v != NULL)
return v;
if (!checkEnvFirst && (flags & FIND_MINE) && ctxt != CTXT_GLOBAL)
v = getvar(VAR_GLOBAL, name, end, k);
if (v != NULL)
return v;
if ((flags & FIND_ENV)) {
char *env;
char *n;
v = getvar(VAR_ENV, name, end, k);
if (v != NULL)
return v;
/* getenv requires a null-terminated name */
n = interval_dup(name, end);
env = getenv(n);
free(n);
if (env != NULL)
return VarAdd(name, env, VAR_ENV);
}
if (checkEnvFirst && (flags & FIND_MINE) && ctxt != CTXT_GLOBAL)
v = getvar(VAR_GLOBAL, name, end, k);
return v;
}
/*-
*-----------------------------------------------------------------------
* 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 in the given context.
* The name and val arguments are duplicated so they may
* safely be freed.
*-----------------------------------------------------------------------
*/
static Var *
VarAdd(name, val, ctxt)
const char *name; /* name of variable to add */
const char *val; /* value to set it to */
GSymT *ctxt; /* context in which to set it */
{
Var *v;
const char *end = NULL;
int idx;
u_int32_t k;
v = new_var(name, val);
v->flags = 0;
idx = quick_lookup(name, &end, &k);
if (idx != -1)
Parse_Error(PARSE_FATAL, "Trying to set dynamic variable %s",
v->name);
else
ohash_insert(ctxt, ohash_lookup_interval(ctxt, name, end, k), v);
return v;
}
/*-
*-----------------------------------------------------------------------
* VarDelete --
* Delete a variable and all the space associated with it.
*-----------------------------------------------------------------------
*/
static void
VarDelete(vp)
void *vp;
{
Var *v = (Var *) vp;
Buf_Destroy(&(v->val));
free(v);
}
/*-
*-----------------------------------------------------------------------
* Var_Delete --
* Remove a variable from a context.
*
* Side Effects:
* The Var structure is removed and freed.
*-----------------------------------------------------------------------
*/
void
Var_Delete(name, ctxt)
const char *name;
GSymT *ctxt;
{
Var *v;
u_int32_t k;
const char *end = NULL;
if (DEBUG(VAR))
printf("%s:delete %s\n", context_name(ctxt), name);
(void)quick_lookup(name, &end, &k);
v = ohash_remove(ctxt, ohash_lookup_interval(ctxt, name, end, k));
if (v != NULL)
VarDelete(v);
}
/*-
*-----------------------------------------------------------------------
* Var_Set --
* Set the variable name to the value val in the given context.
*
* 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)
const char *name; /* name of variable to set */
const char *val; /* value to give to the variable */
GSymT *ctxt; /* context in which to set it */
{
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, (SymTable *)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", context_name(ctxt), 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) {
esetenv(name, val);
(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.
*
* 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)
const char *name; /* Name of variable to modify */
const char *val; /* String to append to it */
GSymT *ctxt; /* Context in which this should occur */
{
Var *v;
v = VarFind(name, (SymTable *)ctxt, (ctxt == VAR_GLOBAL) ? FIND_ENV : 0);
if (v == NULL) {
v = VarAdd(name, val, ctxt);
} else {
Buf_AddSpace(&(v->val));
Buf_AddString(&(v->val), val);
}
if (DEBUG(VAR))
printf("%s:%s = %s\n", context_name(ctxt), name, VarValue(v));
}
/*-
*-----------------------------------------------------------------------
* Var_Exists --
* See if the given variable exists.
*
* Results:
* TRUE if it does, FALSE if it doesn't
*-----------------------------------------------------------------------
*/
Boolean
Var_Exists(name, ctxt)
const char *name; /* Variable to find */
GSymT *ctxt; /* Context in which to start search */
{
Var *v;
v = VarFind(name, (SymTable *)ctxt, FIND_MINE|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
*-----------------------------------------------------------------------
*/
char *
Var_Value(name, ctxt)
const char *name; /* name to find */
GSymT *ctxt; /* context in which to search for it */
{
Var *v;
v = VarFind(name, (SymTable *)ctxt, FIND_ENV | FIND_MINE);
if (v != NULL)
return VarValue(v);
else
return NULL;
}
/*
*-----------------------------------------------------------------------
* v = var_name_with_dollar(str, &pos, ctxt, err, endc)
* handle variable name that contains a dollar
* str points to the first letter of the variable name,
* &pos to the current position in the name (first dollar at invocation,
* end of name specification at return).
* returns the corresponding variable.
*-----------------------------------------------------------------------
*/
static Var *
var_name_with_dollar(str, pos, ctxt, err, endc)
char *str; /* First dollar in variable name */
char **pos; /* Current position in variable spec */
SymTable *ctxt; /* The context for the variable */
Boolean err; /* TRUE if undefined variables are an error */
char endc; /* End character for spec */
{
BUFFER buf; /* Store the variable name */
size_t sublen; /* Deal with recursive expansions */
Boolean subfree;
char *n; /* Sub name */
Var *v;
Buf_Init(&buf, MAKE_BSIZE);
for (;;) {
Buf_AddInterval(&buf, str, *pos);
n = Var_Parse(*pos, ctxt, err, &sublen, &subfree);
if (n != NULL)
Buf_AddString(&buf, n);
if (subfree)
free(n);
*pos += sublen;
str = *pos;
for (; **pos != '$'; (*pos)++) {
if (**pos == '\0' || **pos == endc || **pos == ':') {
Buf_AddInterval(&buf, str, *pos);
v = VarFind(Buf_Retrieve(&buf), ctxt, FIND_ENV | FIND_MINE);
Buf_Destroy(&buf);
return v;
}
}
}
}
/*-
*-----------------------------------------------------------------------
* 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.
*-----------------------------------------------------------------------
*/
char *
Var_Parse(str, ctxt, err, lengthPtr, freePtr)
char *str; /* The string to parse */
SymTable *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 */
{
char *tstr; /* Pointer into str */
Var *v; /* Variable in invocation */
char endc; /* Ending character when variable in parens
* or braces */
char *start;
char *val; /* Variable value */
u_int32_t k;
int idx;
*freePtr = FALSE;
start = str++;
val = NULL;
v = NULL;
idx = 0;
if (*str != '(' && *str != '{') {
tstr = str + 1;
*lengthPtr = 2;
endc = '\0';
} else {
endc = *str == '(' ? ')' : '}';
str++;
/* Find eventual modifiers in the variable */
for (tstr = str; *tstr != ':'; tstr++) {
if (*tstr == '$') {
v = var_name_with_dollar(str, &tstr, ctxt, err, endc);
if (*tstr == '\0' || *tstr == endc)
endc = '\0';
break;
} else if (*tstr == '\0' || *tstr == endc) {
endc = '\0';
break;
}
}
*lengthPtr = tstr+1 - start;
}
if (v == NULL) {
idx = quick_lookup(str, &tstr, &k);
v = varfind(str, tstr, ctxt, FIND_ENV | FIND_MINE, idx, k);
}
if (v == NULL) {
/* Find out about D and F forms of local variables. */
if (idx == -1 && tstr == str+2 && (str[1] == 'D' || str[1] == 'F')) {
switch (*str) {
case '@':
idx = TARGET_INDEX;
break;
case '!':
idx = ARCHIVE_INDEX;
break;
case '*':
idx = PREFIX_INDEX;
break;
case '%':
idx = MEMBER_INDEX;
break;
default:
break;
}
/* This is a DF form, check if we can expand it now. */
if (idx != -1 && ctxt != NULL && ctxt != CTXT_GLOBAL) {
v = varfind(str, str+1, ctxt, 0, idx, 0);
/* No need for nested expansion or anything, as we're
* the only one who sets these things and we sure don't
* do nested invocations in them... */
if (v != NULL) {
val = VarValue(v);
if (str[1] == 'D')
val = Var_GetHead(val);
else
val = Var_GetTail(val);
*freePtr = TRUE;
}
}
}
} else {
if (v->flags & VAR_IN_USE)
Fatal("Variable %s is recursive.", v->name);
/*NOTREACHED*/
else
v->flags |= VAR_IN_USE;
/* Before doing any modification, we have to make sure the value
* has been fully expanded. If it looks like recursion might be
* necessary (there's a dollar sign somewhere in the variable's value)
* we just call Var_Subst to do any other substitutions that are
* necessary. Note that the value returned by Var_Subst will have
* been dynamically-allocated, so it will need freeing when we
* return. */
val = VarValue(v);
if (strchr(val, '$') != NULL) {
val = Var_Subst(val, ctxt, err);
*freePtr = TRUE;
}
v->flags &= ~VAR_IN_USE;
}
if (endc != '\0')
val = VarModifiers_Apply(val, ctxt, err, freePtr, tstr+1, endc,
lengthPtr);
if (val == NULL) {
/* Dynamic source that can't be expanded for now: copy the var
* specification instead. */
if (idx != -1 && (ctxt == NULL || ctxt == CTXT_GLOBAL)) {
*freePtr = TRUE;
val = interval_dup(start, start+ *lengthPtr);
} else
val = err ? var_Error : varNoError;
}
return val;
}
/*-
*-----------------------------------------------------------------------
* 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 */
SymTable *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. Returns the string with substitutions.
*-----------------------------------------------------------------------
*/
char *
Var_SubstVar(str, var, val, estimate)
const char *str; /* The string in which to substitute */
const char *var; /* Named variable */
const char *val; /* Its value */
size_t estimate; /* Size estimate for the result buffer */
{
BUFFER buf; /* Where to store the result */
Buf_Init(&buf, estimate);
for (;;) {
const char *start;
/* Copy uninteresting stuff */
for (start = str; *str != '\0' && *str != '$'; str++)
;
Buf_AddInterval(&buf, start, str);
start = str;
if (*str++ == '\0')
break;
str++;
/* and escaped dollars */
if (start[1] == '$') {
Buf_AddInterval(&buf, start, start+2);
continue;
}
/* Simple variable, if it's not us, copy. */
if (start[1] != '(' && start[1] != '{') {
if (start[1] != *var || var[1] != '\0') {
Buf_AddChars(&buf, 2, start);
continue;
}
} else {
const char *p;
char endc;
if (start[1] == '(')
endc = ')';
else
endc = '}';
/* Find the end of the variable specification. */
p = str;
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, start, p);
str = p;
continue;
}
if (strncmp(var, str, p - str) != 0 ||
var[p - str] != '\0') {
/* Not the variable we want to expand. */
Buf_AddInterval(&buf, start, p);
str = p;
continue;
}
if (*p == ':') {
size_t length; /* Length of the variable invocation */
Boolean doFree; /* Set true if val should be freed */
char *newval; /* Value substituted for a variable */
length = p - str + 1;
doFree = FALSE;
/* val won't be freed since doFree == FALSE, but
* VarModifiers_Apply doesn't know that, hence the cast. */
newval = VarModifiers_Apply((char *)val, NULL, FALSE,
&doFree, p+1, endc, &length);
Buf_AddString(&buf, newval);
if (doFree)
free(newval);
str += length;
continue;
} else
str = p+1;
}
Buf_AddString(&buf, val);
}
return Buf_Retrieve(&buf);
}
/*-
*-----------------------------------------------------------------------
* Var_Init --
* Initialize the module
*
* Side Effects:
* The VAR_CMD and VAR_GLOBAL contexts are created
*-----------------------------------------------------------------------
*/
void
Var_Init()
{
static GSymT global_vars, cmd_vars, env_vars;
VAR_GLOBAL = &global_vars;
VAR_CMD = &cmd_vars;
VAR_ENV = &env_vars;
ohash_init(VAR_GLOBAL, 10, &var_info);
ohash_init(VAR_CMD, 5, &var_info);
ohash_init(VAR_ENV, 5, &var_info);
CTXT_GLOBAL = (SymTable *)VAR_GLOBAL;
CTXT_CMD = (SymTable *)VAR_CMD;
CTXT_ENV = (SymTable *)VAR_ENV;
}
void
Var_End()
{
#ifdef CLEANUP
Var *v;
unsigned int i;
for (v = ohash_first(VAR_GLOBAL, &i); v != NULL;
v = ohash_next(VAR_GLOBAL, &i))
VarDelete(v);
for (v = ohash_first(VAR_CMD, &i); v != NULL;
v = ohash_next(VAR_CMD, &i))
VarDelete(v);
for (v = ohash_first(VAR_ENV, &i); v != NULL;
v = ohash_next(VAR_ENV, &i))
VarDelete(v);
#endif
}
/****************** 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)
GSymT *ctxt;
{
Var *v;
unsigned int i;
for (v = ohash_first(ctxt, &i); v != NULL;
v = ohash_next(ctxt, &i))
VarPrintVar(v);
}
#ifdef POSIX
static const char *quotable = " \t\n\\'\"";
/* In POSIX mode, variable assignments passed on the command line are
* propagated to sub makes through MAKEFLAGS.
*/
void
Var_AddCmdline(name)
const char *name;
{
Var *v;
unsigned int i;
BUFFER buf;
char *s;
Buf_Init(&buf, MAKE_BSIZE);
for (v = ohash_first(VAR_CMD, &i); v != NULL;
v = ohash_next(VAR_CMD, &i)) {
/* We assume variable names don't need quoting */
Buf_AddString(&buf, v->name);
Buf_AddChar(&buf, '=');
for (s = VarValue(v); *s != '\0'; s++) {
if (strchr(quotable, *s))
Buf_AddChar(&buf, '\\');
Buf_AddChar(&buf, *s);
}
Buf_AddSpace(&buf);
}
Var_Append(name, Buf_Retrieve(&buf), VAR_GLOBAL);
Buf_Destroy(&buf);
}
#endif
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