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/*
* Copyright (c) 2000, 2005 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute 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 INSTITUTE 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 INSTITUTE 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 <config.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include "roken.h"
/* find assignment in env list; len is length of variable including
* equal
*/
static int
find_var(char **env, char *assignment, size_t len)
{
int i;
for(i = 0; env != NULL && env[i] != NULL; i++)
if(strncmp(env[i], assignment, len) == 0)
return i;
return -1;
}
/*
* return count of environment assignments from open file F in
* assigned and list of malloced strings in env, return 0 or errno
* number
*/
static int
read_env_file(FILE *F, char ***env, int *assigned)
{
size_t alloced = 0;
size_t idx = 0;
int i;
char **l;
char buf[BUFSIZ], *p, *r;
char **tmp;
int ret = 0;
*assigned = 0;
l = *env;
for (idx = 0; l != NULL && l[idx] != NULL; idx++)
;
if (l)
alloced = idx + 1;
/* This is somewhat more relaxed on what it accepts then
* Wietses sysv_environ from K4 was...
*/
while (fgets(buf, BUFSIZ, F) != NULL) {
buf[strcspn(buf, "#\n")] = '\0';
for(p = buf; isspace((unsigned char)*p); p++);
if (*p == '\0')
continue;
/* Here one should check that it's a 'valid' env string... */
r = strchr(p, '=');
if (r == NULL)
continue;
if((i = find_var(l, p, r - p + 1)) >= 0) {
char *val;
if ((size_t)i >= alloced)
continue; /* Doesn't happen (fix scan-build noise) */
val = strdup(p);
if(val == NULL) {
ret = ENOMEM;
break;
}
free(l[i]);
l[i] = val;
(*assigned)++;
continue;
}
tmp = realloc(l, (idx+2) * sizeof (char *));
if(tmp == NULL) {
ret = ENOMEM;
break;
}
l = tmp;
l[idx] = strdup(p);
if(l[idx] == NULL) {
ret = ENOMEM;
break;
}
l[++idx] = NULL;
alloced = idx + 1;
(*assigned)++;
}
if(ferror(F))
ret = errno;
*env = l;
return ret;
}
/*
* return count of environment assignments from file and
* list of malloced strings in `env'
*/
ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
read_environment(const char *file, char ***env)
{
int assigned;
FILE *F;
if ((F = fopen(file, "r")) == NULL)
return 0;
read_env_file(F, env, &assigned);
fclose(F);
return assigned;
}
ROKEN_LIB_FUNCTION void ROKEN_LIB_CALL
free_environment(char **env)
{
int i;
if (env == NULL)
return;
for (i = 0; env[i]; i++)
free(env[i]);
free(env);
}
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