84 lines
2.2 KiB
C
84 lines
2.2 KiB
C
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/* Copyright (C) 2002 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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extern int buf_findstr(const char *str, char **buf, size_t *buf_len);
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error_t
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argz_replace (char **argz, size_t *argz_len, const char *str, const char *with, unsigned *replace_count)
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{
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const int str_len = strlen(str);
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const int with_len = strlen(with);
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const int len_diff = with_len - str_len;
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char *buf_iter = *argz;
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size_t buf_len = *argz_len;
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char *last_iter = NULL;
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char *new_argz = NULL;
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size_t new_argz_len = 0;
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char *new_argz_iter = NULL;
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*replace_count = 0;
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new_argz_len = *argz_len;
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while(buf_len)
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{
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if(buf_findstr(str, &buf_iter, &buf_len))
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{
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*replace_count += 1;
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new_argz_len += len_diff;
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}
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}
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if (*replace_count)
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{
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new_argz = (char *)malloc(new_argz_len);
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buf_iter = *argz;
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buf_len = *argz_len;
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last_iter = buf_iter;
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new_argz_iter = new_argz;
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while(buf_len)
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{
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if (buf_findstr(str, &buf_iter, &buf_len))
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{
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/* copy everything up to, but not including str, from old argz to
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new argz. */
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memcpy(new_argz_iter, last_iter, buf_iter - last_iter - str_len);
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new_argz_iter += (buf_iter - last_iter - str_len);
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/* copy replacement string. */
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memcpy(new_argz_iter, with, with_len);
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new_argz_iter += with_len;
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last_iter = buf_iter;
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}
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}
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/* copy everything after last occurrence of str. */
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memcpy(new_argz_iter, last_iter, *argz + *argz_len - last_iter);
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/* reallocate argz, and copy over the new value. */
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if(!(*argz = (char *)realloc(*argz, new_argz_len)))
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return ENOMEM;
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memcpy(*argz, new_argz, new_argz_len);
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*argz_len = new_argz_len;
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if (*argz_len == 0)
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{
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free(*argz);
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*argz = NULL;
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}
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free(new_argz);
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}
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return 0;
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}
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