49 lines
1.1 KiB
C
49 lines
1.1 KiB
C
/* Copyright (C) 2002, 2005 by Red Hat, Incorporated. All rights reserved.
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*
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* Permission to use, copy, modify, and distribute this software
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* is freely granted, provided that this notice is preserved.
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*/
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#include <errno.h>
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#include <sys/types.h>
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#include <string.h>
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#include <stdlib.h>
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#include <argz.h>
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#define __need_ptrdiff_t
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#include <stddef.h>
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error_t
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_DEFUN (argz_insert, (argz, argz_len, before, entry),
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char **argz,
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size_t *argz_len,
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char *before,
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const char *entry)
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{
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int len = 0;
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ptrdiff_t delta;
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if (before == NULL)
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return argz_add(argz, argz_len, entry);
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if (before < *argz || before >= *argz + *argz_len)
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return EINVAL;
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while (before != *argz && before[-1])
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before--;
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/* delta will always be non-negative, and < *argz_len */
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delta = before - *argz;
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len = strlen(entry) + 1;
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if(!(*argz = (char *)realloc(*argz, *argz_len + len)))
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return ENOMEM;
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memmove(*argz + delta + len, *argz + delta, *argz_len - delta);
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memcpy(*argz + delta, entry, len);
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*argz_len += len;
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return 0;
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}
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