Mercurial > trustbridge > trustbridge
comparison common/strhelp.c @ 59:3f6378647371
Start work on cinst. Strhelp new helpers to work with C String
arrays and to have a terminating malloc / realloc
| author | Andre Heinecke <aheinecke@intevation.de> |
|---|---|
| date | Tue, 18 Mar 2014 10:04:30 +0000 |
| parents | |
| children | 6acb1dae6185 |
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| 58:ad61489ce593 | 59:3f6378647371 |
|---|---|
| 1 | |
| 2 #include <stdio.h> | |
| 3 #include <stdlib.h> | |
| 4 #include <string.h> | |
| 5 #include <assert.h> | |
| 6 | |
| 7 static void | |
| 8 out_of_core(void) | |
| 9 { | |
| 10 fputs("\nfatal: out of memory\n", stderr); | |
| 11 exit(2); | |
| 12 } | |
| 13 void * | |
| 14 xmalloc( size_t n ) | |
| 15 { | |
| 16 void *p = malloc( n ); | |
| 17 if( !p ) | |
| 18 out_of_core(); | |
| 19 return p; | |
| 20 } | |
| 21 | |
| 22 void * | |
| 23 xrealloc( void *a, size_t n ) | |
| 24 { | |
| 25 void *p = realloc( a, n ); | |
| 26 if( !p ) | |
| 27 out_of_core(); | |
| 28 return p; | |
| 29 } | |
| 30 | |
| 31 char * | |
| 32 xstrdup( const char *string ) | |
| 33 { | |
| 34 void *p = xmalloc( strlen(string)+1 ); | |
| 35 strcpy( p, string ); | |
| 36 return p; | |
| 37 } | |
| 38 | |
| 39 | |
| 40 /** | |
| 41 * strv_length: | |
| 42 * @str_array: a %NULL-terminated array of strings | |
| 43 * | |
| 44 * Returns the length of the given %NULL-terminated | |
| 45 * string array @str_array. | |
| 46 * | |
| 47 * Return value: length of @str_array. | |
| 48 * | |
| 49 */ | |
| 50 unsigned int | |
| 51 strv_length (char **str_array) | |
| 52 { | |
| 53 unsigned int i = 0; | |
| 54 | |
| 55 if (!str_array) | |
| 56 return 0; | |
| 57 | |
| 58 while (str_array[i]) | |
| 59 ++i; | |
| 60 | |
| 61 return i; | |
| 62 } | |
| 63 | |
| 64 /* @brief append a string to a NULL terminated array of strings. | |
| 65 * | |
| 66 * @param[inout] array pointer to the NULL terminated list of string pointers. | |
| 67 * @param[in] string pointer to the string to append to the list. | |
| 68 * */ | |
| 69 void array_append_str(char ***pArray, const char *string) | |
| 70 { | |
| 71 unsigned int old_len = strv_length(*pArray); | |
| 72 *pArray = xrealloc(*pArray, sizeof(char**) * (old_len + 2)); | |
| 73 | |
| 74 *pArray[old_len] = xstrdup(string); | |
| 75 *pArray[old_len + 1] = NULL; | |
| 76 } | |
| 77 | |
| 78 /* @brief append a string to another string. | |
| 79 * | |
| 80 * @param[inout] pDst pointer to the string to be extended. | |
| 81 * @param[in] appendage pointer to the string to append. | |
| 82 * */ | |
| 83 void str_append_str(char **pDst, const char *appendage) | |
| 84 { | |
| 85 size_t old_len = strlen(*pDst), | |
| 86 added_len = strlen(appendage); | |
| 87 size_t new_len = old_len + added_len + 1; | |
| 88 | |
| 89 if (!appendage) | |
| 90 return; | |
| 91 | |
| 92 *pDst = (char *)xrealloc(*pDst, sizeof(char) * (new_len)); | |
| 93 | |
| 94 strcpy(*pDst + old_len, appendage); | |
| 95 | |
| 96 *pDst[new_len - 1] = '\0'; | |
| 97 } | |
| 98 | |
| 99 void | |
| 100 strfreev (char **str_array) | |
| 101 { | |
| 102 if (str_array) | |
| 103 { | |
| 104 int i; | |
| 105 | |
| 106 for (i = 0; str_array[i] != NULL; i++) | |
| 107 free (str_array[i]); | |
| 108 | |
| 109 free (str_array); | |
| 110 } | |
| 111 } |