[444] | 1 | /* Copyright (C) 2002 by Red Hat, Incorporated. All rights reserved. |
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| 2 | * |
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| 3 | * Permission to use, copy, modify, and distribute this software |
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| 4 | * is freely granted, provided that this notice is preserved. |
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| 5 | */ |
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| 6 | |
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| 7 | #include <errno.h> |
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| 8 | #include <sys/types.h> |
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| 9 | #include <string.h> |
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| 10 | #include <stdlib.h> |
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| 11 | #include <argz.h> |
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| 12 | |
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| 13 | #include "buf_findstr.h" |
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| 14 | |
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| 15 | error_t |
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| 16 | argz_replace (char **argz, |
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| 17 | size_t *argz_len, |
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| 18 | const char *str, |
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| 19 | const char *with, |
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| 20 | unsigned *replace_count) |
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| 21 | { |
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| 22 | const int str_len = strlen(str); |
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| 23 | const int with_len = strlen(with); |
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| 24 | const int len_diff = with_len - str_len; |
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| 25 | |
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| 26 | char *buf_iter = *argz; |
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| 27 | size_t buf_len = *argz_len; |
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| 28 | char *last_iter = NULL; |
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| 29 | char *new_argz = NULL; |
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| 30 | size_t new_argz_len = 0; |
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| 31 | char *new_argz_iter = NULL; |
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| 32 | char *argz_realloc = NULL; |
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| 33 | |
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| 34 | *replace_count = 0; |
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| 35 | new_argz_len = *argz_len; |
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| 36 | |
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| 37 | while(buf_len) |
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| 38 | { |
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| 39 | if(_buf_findstr(str, &buf_iter, &buf_len)) |
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| 40 | { |
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| 41 | *replace_count += 1; |
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| 42 | new_argz_len += len_diff; |
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| 43 | } |
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| 44 | } |
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| 45 | |
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| 46 | if (*replace_count) |
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| 47 | { |
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| 48 | if (!(new_argz = (char *)malloc(new_argz_len))) |
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| 49 | return ENOMEM; |
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| 50 | |
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| 51 | buf_iter = *argz; |
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| 52 | buf_len = *argz_len; |
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| 53 | last_iter = buf_iter; |
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| 54 | new_argz_iter = new_argz; |
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| 55 | |
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| 56 | while(buf_len) |
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| 57 | { |
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| 58 | if (_buf_findstr(str, &buf_iter, &buf_len)) |
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| 59 | { |
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| 60 | /* copy everything up to, but not including str, from old argz to |
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| 61 | new argz. */ |
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| 62 | memcpy(new_argz_iter, last_iter, buf_iter - last_iter - str_len); |
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| 63 | new_argz_iter += (buf_iter - last_iter - str_len); |
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| 64 | /* copy replacement string. */ |
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| 65 | memcpy(new_argz_iter, with, with_len); |
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| 66 | new_argz_iter += with_len; |
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| 67 | last_iter = buf_iter; |
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| 68 | } |
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| 69 | } |
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| 70 | /* copy everything after last occurrence of str. */ |
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| 71 | memcpy(new_argz_iter, last_iter, *argz + *argz_len - last_iter); |
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| 72 | |
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| 73 | /* reallocate argz, and copy over the new value. */ |
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| 74 | if(!(argz_realloc = (char *)realloc(*argz, new_argz_len))) |
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| 75 | { |
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| 76 | free(new_argz); |
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| 77 | return ENOMEM; |
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| 78 | } |
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| 79 | *argz = argz_realloc; |
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| 80 | |
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| 81 | memcpy(*argz, new_argz, new_argz_len); |
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| 82 | *argz_len = new_argz_len; |
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| 83 | |
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| 84 | if (*argz_len == 0) |
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| 85 | { |
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| 86 | free(*argz); |
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| 87 | *argz = NULL; |
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| 88 | } |
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| 89 | free(new_argz); |
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| 90 | } |
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| 91 | |
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| 92 | return 0; |
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| 93 | } |
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