2 * FCRON - periodic command scheduler
4 * Copyright 2000-2014 Thibault Godouet <fcron@free.fr>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 * The GNU General Public License can also be found in the file
21 * `LICENSE' that comes with the fcron source distribution.
25 /* List of jobs currently being executed.
26 * This is a wrapper for an u_list (unordered list) (see u_list.h and u_list.c),
27 * to make the rest of the code clearer and as a way to ensure the compiler can checks
28 * the type in the rest of the code (u_list extensively uses the void type) */
37 return (env_list_t *) u_list_init(sizeof(env_t),
38 ENVVAR_INITIAL_SIZE, ENVVAR_GROW_SIZE);
42 env_list_copy(env_list_t * list)
44 env_list_t *new_list = NULL;
47 /* copy the list structure */
48 new_list = (env_list_t *) u_list_copy((u_list_t *) list);
50 /* for now the new list points to the same data strings - duplicate them */
51 for (e = env_list_first(new_list); e != NULL; e = env_list_next(new_list)) {
52 e->e_envvar = strdup2(e->e_envvar);
60 env_list_setenv(env_list_t * list, char *name, char *value, int overwrite)
64 size_t len = strlen(name) + 1 + strlen(value) + 1; /* 1 for '=', 1 for '\0' */
67 if (name == NULL || name[0] == '\0')
70 /* check if a var 'name' already exists */
71 for (c = env_list_first(list); c != NULL; c = env_list_next(list)) {
72 if (strcmp_until(name, c->e_envvar, '=') == 0) {
73 /* variable already set: overwrite the value if asked
74 * and return that entry */
77 realloc_safe(c->e_envvar, len, "new env var value");
78 snprintf(c->e_envvar, len, "%s=%s", name, value);
80 env_list_end_iteration(list);
85 /* if we're here we didn't find a var called 'name': add it */
86 e.e_envvar = alloc_safe(len, "new env var");
87 snprintf(e.e_envvar, len, "%s=%s", name, value);
88 return (env_t *) u_list_add((u_list_t *) list, (u_list_entry_t *) & e);
92 env_list_putenv(env_list_t * list, char *envvar, int overwrite)
96 size_t len = strlen(envvar) + 1; /* +1 for the terminating '\0' */
99 if (envvar == NULL || envvar[0] == '\0')
102 /* check if a var 'name' already exists */
103 for (c = env_list_first(list); c != NULL; c = env_list_next(list)) {
104 if (strcmp_until(envvar, c->e_envvar, '=') == 0) {
105 /* variable already set: overwrite the value if asked
106 * and return that entry */
107 if (overwrite == 1) {
109 realloc_safe(c->e_envvar, len, "new env var value");
110 memcpy(c->e_envvar, envvar, len); /* includes the final '\0' */
112 env_list_end_iteration(list);
117 /* if we're here we didn't find a var called 'name': add it */
118 e.e_envvar = strdup2(envvar);
119 return (env_t *) u_list_add((u_list_t *) list, (u_list_entry_t *) & e);
123 env_list_getenv(env_list_t * list, char *name)
128 if (name == NULL || name[0] == '\0')
131 for (c = env_list_first(list); c != NULL; c = env_list_next(list)) {
132 if (strcmp_until(name, c->e_envvar, '=') == 0) {
133 /* found the var: return the pointer to the value */
134 env_list_end_iteration(list);
135 return (c->e_envvar + strlen(name) + 1); /* +1 for '=' */
139 /* var 'name' not found */
144 env_list_first(env_list_t * list)
146 return (env_t *) u_list_first((u_list_t *) list);
150 env_list_next(env_list_t * list)
152 return (env_t *) u_list_next((u_list_t *) list);
156 env_list_end_iteration(env_list_t * list)
158 u_list_end_iteration((u_list_t *) list);
162 env_list_destroy(env_list_t * list)
163 /* free() the memory allocated for list and returns NULL */
167 /* make sure the iteration below won't fail in case one was already iterating */
168 env_list_end_iteration(list);
169 /* free the data in the env_t entries */
170 for (c = env_list_first(list); c != NULL; c = env_list_next(list)) {
171 Free_safe(c->e_envvar);
173 /* free the actual list structure */
174 return (env_list_t *) u_list_destroy((u_list_t *) list);
178 env_list_export_envp(env_list_t * list)
179 /* export list data as a char **envp structure to use as an argument of execle() */
185 /* +1 for the end-of-list NULL */
187 alloc_safe((list->num_entries + 1) * sizeof(char *),
188 "environment export");
190 for (c = env_list_first(list), i = 0; c != NULL && i < list->num_entries;
191 c = env_list_next(list), i++) {
192 envp[i] = strdup2(c->e_envvar);
194 /* add a NULL as a end-of-list marker */
195 envp[(list->num_entries + 1) - 1] = NULL;
201 env_list_free_envp(char **envp)
205 for (p = envp[0]; p != NULL; p++) {