1 /* Copyright (C) 2002, 2005 by Red Hat, Incorporated. All rights reserved.
2 *
3 * Permission to use, copy, modify, and distribute this software
4 * is freely granted, provided that this notice is preserved.
5 */
6
7 #include <errno.h>
8 #include <sys/types.h>
9 #include <string.h>
10 #include <stdlib.h>
11 #include <argz.h>
12 #define __need_ptrdiff_t
13 #include <stddef.h>
14
15 error_t
argz_insert(char ** argz,size_t * argz_len,char * before,const char * entry)16 argz_insert (char **argz,
17 size_t *argz_len,
18 char *before,
19 const char *entry)
20 {
21 int len = 0;
22 ptrdiff_t delta;
23
24 if (before == NULL)
25 return argz_add(argz, argz_len, entry);
26
27 if (before < *argz || before >= *argz + *argz_len)
28 return EINVAL;
29
30 while (before != *argz && before[-1])
31 before--;
32
33 /* delta will always be non-negative, and < *argz_len */
34 delta = before - *argz;
35
36 len = strlen(entry) + 1;
37
38 if(!(*argz = (char *)realloc(*argz, *argz_len + len)))
39 return ENOMEM;
40
41 memmove(*argz + delta + len, *argz + delta, *argz_len - delta);
42 memcpy(*argz + delta, entry, len);
43
44 *argz_len += len;
45
46 return 0;
47 }
48
