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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* Copyright (C) 2018 - David Oberhollenzer
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include "init.h"
#include "util.h"
struct entry {
struct entry *next;
char data[];
};
extern char **environ;
static void free_list(struct entry *list)
{
struct entry *e;
while (list != NULL) {
e = list;
list = list->next;
free(e);
}
}
static struct entry *parse_list(rdline_t *rd)
{
struct entry *e, *list = NULL;
char *ptr;
while (rdline(rd) == 0) {
ptr = rd->buffer;
while (*ptr != '\0' && *ptr != ' ' && *ptr != '=')
++ptr;
if (*ptr == ' ')
memmove(ptr, ptr + 1, strlen(ptr + 1) + 1);
if (*(ptr++) != '=') {
fprintf(stderr, "%s: %zu: line is not of the shape "
"'key = value', skipping\n",
rd->filename, rd->lineno);
continue;
}
if (*ptr == ' ')
memmove(ptr, ptr + 1, strlen(ptr + 1) + 1);
if (unescape(ptr)) {
fprintf(stderr, "%s: %zu: malformed string constant, "
"skipping\n",
rd->filename, rd->lineno);
continue;
}
e = calloc(1, sizeof(*e) + strlen(rd->buffer) + 1);
if (e == NULL)
goto fail_oom;
strcpy(e->data, rd->buffer);
e->next = list;
list = e;
}
return list;
fail_oom:
fputs("out of memory\n", stderr);
free_list(list);
return NULL;
}
static struct entry *list_from_file(void)
{
struct entry *list;
rdline_t rd;
int fd;
fd = open(ENVFILE, O_RDONLY);
if (fd < 0) {
perror(ENVFILE);
return NULL;
}
rdline_init(&rd, fd, ENVFILE, 0, NULL);
list = parse_list(&rd);
close(fd);
return list;
}
int initenv(void)
{
struct entry *list, *e;
int i, count;
char **envp;
list = list_from_file();
if (list == NULL)
return -1;
for (count = 0, e = list; e != NULL; e = e->next)
++count;
envp = malloc((count + 1) * sizeof(char *));
if (envp == NULL) {
fputs("out of memory\n", stderr);
free_list(list);
return -1;
}
for (i = 0, e = list; e != NULL; e = e->next)
envp[i] = e->data;
envp[i] = NULL;
environ = envp;
return 0;
}
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