diff options
Diffstat (limited to 'qemu/util/envlist.c')
| -rw-r--r-- | qemu/util/envlist.c | 242 |
1 files changed, 0 insertions, 242 deletions
diff --git a/qemu/util/envlist.c b/qemu/util/envlist.c deleted file mode 100644 index e86857e70..000000000 --- a/qemu/util/envlist.c +++ /dev/null @@ -1,242 +0,0 @@ -#include "qemu/osdep.h" -#include "qemu-common.h" -#include "qemu/queue.h" -#include "qemu/envlist.h" - -struct envlist_entry { - const char *ev_var; /* actual env value */ - QLIST_ENTRY(envlist_entry) ev_link; -}; - -struct envlist { - QLIST_HEAD(, envlist_entry) el_entries; /* actual entries */ - size_t el_count; /* number of entries */ -}; - -static int envlist_parse(envlist_t *envlist, - const char *env, int (*)(envlist_t *, const char *)); - -/* - * Allocates new envlist and returns pointer to that or - * NULL in case of error. - */ -envlist_t * -envlist_create(void) -{ - envlist_t *envlist; - - if ((envlist = malloc(sizeof (*envlist))) == NULL) - return (NULL); - - QLIST_INIT(&envlist->el_entries); - envlist->el_count = 0; - - return (envlist); -} - -/* - * Releases given envlist and its entries. - */ -void -envlist_free(envlist_t *envlist) -{ - struct envlist_entry *entry; - - assert(envlist != NULL); - - while (envlist->el_entries.lh_first != NULL) { - entry = envlist->el_entries.lh_first; - QLIST_REMOVE(entry, ev_link); - - free((char *)entry->ev_var); - free(entry); - } - free(envlist); -} - -/* - * Parses comma separated list of set/modify environment - * variable entries and updates given enlist accordingly. - * - * For example: - * envlist_parse(el, "HOME=foo,SHELL=/bin/sh"); - * - * inserts/sets environment variables HOME and SHELL. - * - * Returns 0 on success, errno otherwise. - */ -int -envlist_parse_set(envlist_t *envlist, const char *env) -{ - return (envlist_parse(envlist, env, &envlist_setenv)); -} - -/* - * Parses comma separated list of unset environment variable - * entries and removes given variables from given envlist. - * - * Returns 0 on success, errno otherwise. - */ -int -envlist_parse_unset(envlist_t *envlist, const char *env) -{ - return (envlist_parse(envlist, env, &envlist_unsetenv)); -} - -/* - * Parses comma separated list of set, modify or unset entries - * and calls given callback for each entry. - * - * Returns 0 in case of success, errno otherwise. - */ -static int -envlist_parse(envlist_t *envlist, const char *env, - int (*callback)(envlist_t *, const char *)) -{ - char *tmpenv, *envvar; - char *envsave = NULL; - int ret = 0; - assert(callback != NULL); - - if ((envlist == NULL) || (env == NULL)) - return (EINVAL); - - if ((tmpenv = strdup(env)) == NULL) - return (errno); - envsave = tmpenv; - - do { - envvar = strchr(tmpenv, ','); - if (envvar != NULL) { - *envvar = '\0'; - } - if ((*callback)(envlist, tmpenv) != 0) { - ret = errno; - break; - } - tmpenv = envvar + 1; - } while (envvar != NULL); - - free(envsave); - return ret; -} - -/* - * Sets environment value to envlist in similar manner - * than putenv(3). - * - * Returns 0 in success, errno otherwise. - */ -int -envlist_setenv(envlist_t *envlist, const char *env) -{ - struct envlist_entry *entry = NULL; - const char *eq_sign; - size_t envname_len; - - if ((envlist == NULL) || (env == NULL)) - return (EINVAL); - - /* find out first equals sign in given env */ - if ((eq_sign = strchr(env, '=')) == NULL) - return (EINVAL); - envname_len = eq_sign - env + 1; - - /* - * If there already exists variable with given name - * we remove and release it before allocating a whole - * new entry. - */ - for (entry = envlist->el_entries.lh_first; entry != NULL; - entry = entry->ev_link.le_next) { - if (strncmp(entry->ev_var, env, envname_len) == 0) - break; - } - - if (entry != NULL) { - QLIST_REMOVE(entry, ev_link); - free((char *)entry->ev_var); - free(entry); - } else { - envlist->el_count++; - } - - if ((entry = malloc(sizeof (*entry))) == NULL) - return (errno); - if ((entry->ev_var = strdup(env)) == NULL) { - free(entry); - return (errno); - } - QLIST_INSERT_HEAD(&envlist->el_entries, entry, ev_link); - - return (0); -} - -/* - * Removes given env value from envlist in similar manner - * than unsetenv(3). Returns 0 in success, errno otherwise. - */ -int -envlist_unsetenv(envlist_t *envlist, const char *env) -{ - struct envlist_entry *entry; - size_t envname_len; - - if ((envlist == NULL) || (env == NULL)) - return (EINVAL); - - /* env is not allowed to contain '=' */ - if (strchr(env, '=') != NULL) - return (EINVAL); - - /* - * Find out the requested entry and remove - * it from the list. - */ - envname_len = strlen(env); - for (entry = envlist->el_entries.lh_first; entry != NULL; - entry = entry->ev_link.le_next) { - if (strncmp(entry->ev_var, env, envname_len) == 0) - break; - } - if (entry != NULL) { - QLIST_REMOVE(entry, ev_link); - free((char *)entry->ev_var); - free(entry); - - envlist->el_count--; - } - return (0); -} - -/* - * Returns given envlist as array of strings (in same form that - * global variable environ is). Caller must free returned memory - * by calling free(3) for each element and for the array. Returned - * array and given envlist are not related (no common references). - * - * If caller provides count pointer, number of items in array is - * stored there. In case of error, NULL is returned and no memory - * is allocated. - */ -char ** -envlist_to_environ(const envlist_t *envlist, size_t *count) -{ - struct envlist_entry *entry; - char **env, **penv; - - penv = env = malloc((envlist->el_count + 1) * sizeof (char *)); - if (env == NULL) - return (NULL); - - for (entry = envlist->el_entries.lh_first; entry != NULL; - entry = entry->ev_link.le_next) { - *(penv++) = strdup(entry->ev_var); - } - *penv = NULL; /* NULL terminate the list */ - - if (count != NULL) - *count = envlist->el_count; - - return (env); -} |