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/* $OpenBSD: parsevar.c,v 1.18 2024/06/18 02:11:03 millert Exp $ */
/* $NetBSD: parse.c,v 1.29 1997/03/10 21:20:04 christos Exp $ */
/*
* Copyright (c) 2001 Marc Espie.
*
* 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.
*/
#include <ctype.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include "defines.h"
#include "var.h"
#include "varname.h"
#include "error.h"
#include "cmd_exec.h"
#include "parsevar.h"
static const char *find_op1(const char *);
static bool parse_variable_assignment(const char *, int);
static const char *
find_op1(const char *p)
{
for(;; p++) {
if (ISSPACE(*p) || *p == '$' || *p == '\0')
break;
if (p[strspn(p, "?:!+")] == '=')
break;
if (p[0] == ':' && p[1] == 's' && p[2] == 'h')
break;
}
return p;
}
static bool
parse_variable_assignment(const char *line, int ctxt)
{
const char *arg;
char *res1 = NULL, *res2 = NULL;
#define VAR_INVALID -1
#define VAR_NORMAL 0
#define VAR_SUBST 1
#define VAR_APPEND 2
#define VAR_SHELL 4
#define VAR_OPT 8
#define VAR_LAZYSHELL 16
#define VAR_SUNSHELL 32
int type;
struct Name name;
arg = VarName_Get(line, &name, NULL, true, find_op1);
while (ISSPACE(*arg))
arg++;
type = VAR_NORMAL;
/* double operators (except for :) are forbidden */
/* OPT and APPEND don't match */
/* APPEND and LAZYSHELL can't really work */
while (*arg != '=') {
/* Check operator type. */
switch (*arg++) {
case '+':
if (type & (VAR_OPT|VAR_LAZYSHELL|VAR_APPEND))
type = VAR_INVALID;
else
type |= VAR_APPEND;
break;
case '?':
if (type & (VAR_OPT|VAR_APPEND))
type = VAR_INVALID;
else
type |= VAR_OPT;
break;
case ':':
if (strncmp(arg, "sh", 2) == 0) {
type = VAR_SUNSHELL;
arg += 2;
while (*arg != '=' && *arg != '\0')
arg++;
} else {
if (type & VAR_SUBST)
type = VAR_INVALID;
else
type |= VAR_SUBST;
}
break;
case '!':
if (type & VAR_SHELL) {
if (type & (VAR_APPEND))
type = VAR_INVALID;
else
type = VAR_LAZYSHELL;
} else if (type & (VAR_LAZYSHELL|VAR_SUNSHELL))
type = VAR_INVALID;
else
type |= VAR_SHELL;
break;
default:
type = VAR_INVALID;
break;
}
if (type == VAR_INVALID) {
VarName_Free(&name);
return false;
}
}
arg++;
while (ISSPACE(*arg))
arg++;
/* If the variable already has a value, we don't do anything. */
if ((type & VAR_OPT) && Var_Definedi(name.s, name.e)) {
VarName_Free(&name);
return true;
}
if (type & (VAR_SHELL|VAR_SUNSHELL)) {
char *err;
if (strchr(arg, '$') != NULL) {
char *sub;
/* There's a dollar sign in the command, so perform
* variable expansion on the whole thing. */
sub = Var_Subst(arg, NULL, true);
res1 = Cmd_Exec(sub, &err);
free(sub);
} else
res1 = Cmd_Exec(arg, &err);
if (err)
Parse_Error(PARSE_WARNING, err, arg);
arg = res1;
}
if (type & VAR_LAZYSHELL) {
if (strchr(arg, '$') != NULL) {
/* There's a dollar sign in the command, so perform
* variable expansion on the whole thing. */
arg = Var_Subst(arg, NULL, true);
}
}
if (type & VAR_SUBST) {
/*
* Allow variables in the old value to be undefined, but leave
* their invocation alone -- this is done by forcing
* errorIsOkay to be false.
* XXX: This can cause recursive variables, but that's not
* hard to do, and this allows someone to do something like
*
* CFLAGS = $(.INCLUDES)
* CFLAGS := -I.. $(CFLAGS)
*
* And not get an error.
*/
bool saved = errorIsOkay;
errorIsOkay = false;
/* ensure the variable is set to something to avoid `variable
* is recursive' errors. */
if (!Var_Definedi(name.s, name.e))
Var_Seti_with_ctxt(name.s, name.e, "", ctxt);
res2 = Var_Subst(arg, NULL, false);
errorIsOkay = saved;
arg = res2;
}
if (type & VAR_APPEND)
Var_Appendi_with_ctxt(name.s, name.e, arg, ctxt);
else
Var_Seti_with_ctxt(name.s, name.e, arg, ctxt);
if (type & VAR_LAZYSHELL)
Var_Mark(name.s, name.e, VAR_EXEC_LATER);
VarName_Free(&name);
free(res2);
free(res1);
return true;
}
bool
Parse_As_Var_Assignment(const char *line)
{
return parse_variable_assignment(line, VAR_GLOBAL);
}
bool
Parse_CmdlineVar(const char *line)
{
bool result;
bool saved = errorIsOkay;
errorIsOkay = false;
result = parse_variable_assignment(line, VAR_CMD);
errorIsOkay = saved;
return result;
}
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