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