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/* nbdkit
* Copyright (C) 2018-2023 Red Hat Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * Neither the name of Red Hat nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include "guestfs-stringlists-utils.h"
#include "guestfs-utils.h"
/* Copy an environ. Also this allows you to add (key, value) pairs to
* the environ through the varargs NULL-terminated list. Returns NULL
* if the copy or allocation failed.
*/
char **
guestfs_int_copy_environ (char **env, ...)
{
char **ret = NULL, **new_ret;
size_t i, len, nr_strings;
char *s;
va_list argp;
const char *key, *value;
/* Copy the existing keys into the new vector. */
ret = guestfs_int_copy_string_list (env);
if (ret == NULL)
return NULL;
nr_strings = guestfs_int_count_strings (ret);
/* Add the new keys. */
va_start (argp, env);
while ((key = va_arg (argp, const char *)) != NULL) {
value = va_arg (argp, const char *);
if (asprintf (&s, "%s=%s", key, value) == -1) {
va_end (argp);
goto error;
}
/* Search for key in the existing environment. It's O(n^2) ... */
len = strlen (key);
for (i = 0; ret[i] != NULL; ++i) {
if (strncmp (key, ret[i], len) == 0 && ret[i][len] == '=') {
/* Replace the existing key. */
free (ret[i]);
ret[i] = s;
goto found;
}
}
/* Else, append a new key to the list. */
new_ret = realloc (ret, (nr_strings+2) * sizeof (char *));
if (new_ret == NULL) {
free (s);
goto error;
}
ret = new_ret;
ret[nr_strings+1] = NULL;
ret[nr_strings] = s;
nr_strings++;
found: ;
}
va_end (argp);
/* Return the list of strings. */
return ret;
error:
for (i = 0; ret[i] != NULL; ++i)
free (ret[i]);
free (ret);
return NULL;
}
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