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/***
This file is part of eudev, forked from 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_clear(char **l) {
char **k;
if (!l)
return;
for (k = l; *k; k++)
free(*k);
*l = NULL;
}
char **strv_free(char **l) {
strv_clear(l);
free(l);
return NULL;
}
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, m;
if (!value)
return 0;
n = strv_length(*l);
/* increase and check for overflow */
m = n + 2;
if (m < n)
return -ENOMEM;
c = realloc_multiply(*l, sizeof(char*), m);
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;
}
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