diff options
Diffstat (limited to 'src/shared/strv.c')
| -rw-r--r-- | src/shared/strv.c | 218 |
1 files changed, 218 insertions, 0 deletions
diff --git a/src/shared/strv.c b/src/shared/strv.c new file mode 100644 index 0000000000..da8ea8a0a6 --- /dev/null +++ b/src/shared/strv.c @@ -0,0 +1,218 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +/*** + This file is part of systemd. + + Copyright 2010 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <assert.h> +#include <stdlib.h> +#include <stdarg.h> +#include <string.h> +#include <errno.h> + +#include "util.h" +#include "strv.h" + +void strv_free(char **l) { + char **k; + + if (!l) + return; + + for (k = l; *k; k++) + free(*k); + + free(l); +} + +char **strv_copy(char * const *l) { + char **r, **k; + + k = r = new(char*, strv_length(l) + 1); + if (!r) + return NULL; + + if (l) + for (; *l; k++, l++) { + *k = strdup(*l); + if (!*k) { + strv_free(r); + return NULL; + } + } + + *k = NULL; + return r; +} + +unsigned strv_length(char * const *l) { + unsigned n = 0; + + if (!l) + return 0; + + for (; *l; l++) + n++; + + return n; +} + +char **strv_new_ap(const char *x, va_list ap) { + const char *s; + char **a; + unsigned n = 0, i = 0; + va_list aq; + + /* As a special trick we ignore all listed strings that equal + * (const char*) -1. This is supposed to be used with the + * STRV_IFNOTNULL() macro to include possibly NULL strings in + * the string list. */ + + if (x) { + n = x == (const char*) -1 ? 0 : 1; + + va_copy(aq, ap); + while ((s = va_arg(aq, const char*))) { + if (s == (const char*) -1) + continue; + + n++; + } + + va_end(aq); + } + + a = new(char*, n+1); + if (!a) + return NULL; + + if (x) { + if (x != (const char*) -1) { + a[i] = strdup(x); + if (!a[i]) + goto fail; + i++; + } + + while ((s = va_arg(ap, const char*))) { + + if (s == (const char*) -1) + continue; + + a[i] = strdup(s); + if (!a[i]) + goto fail; + + i++; + } + } + + a[i] = NULL; + + return a; + +fail: + strv_free(a); + return NULL; +} + +char **strv_new(const char *x, ...) { + char **r; + va_list ap; + + va_start(ap, x); + r = strv_new_ap(x, ap); + va_end(ap); + + return r; +} + +int strv_push(char ***l, char *value) { + char **c; + unsigned n; + + if (!value) + return 0; + + n = strv_length(*l); + c = realloc(*l, sizeof(char*) * (n + 2)); + if (!c) + return -ENOMEM; + + c[n] = value; + c[n+1] = NULL; + + *l = c; + return 0; +} + +int strv_consume(char ***l, char *value) { + int r; + + r = strv_push(l, value); + if (r < 0) + free(value); + + return r; +} + +int strv_extend(char ***l, const char *value) { + char *v; + + if (!value) + return 0; + + v = strdup(value); + if (!v) + return -ENOMEM; + + return strv_consume(l, v); +} + +char **strv_uniq(char **l) { + char **i; + + /* Drops duplicate entries. The first identical string will be + * kept, the others dropped */ + + STRV_FOREACH(i, l) + strv_remove(i+1, *i); + + return l; +} + +char **strv_remove(char **l, const char *s) { + char **f, **t; + + if (!l) + return NULL; + + assert(s); + + /* Drops every occurrence of s in the string list, edits + * in-place. */ + + for (f = t = l; *f; f++) + if (streq(*f, s)) + free(*f); + else + *(t++) = *f; + + *t = NULL; + return l; +} |