Mercurial > hg > dmlib
annotate src/dmstring.c @ 1884:47fe47f01fea
Implement dm_strdup_vprintf_len(const char *fmt, va_list args, int *len), which
returns length of the generated string in int pointer *len.
| author | Matti Hamalainen <ccr@tnsp.org> |
|---|---|
| date | Mon, 25 Jun 2018 13:24:27 +0300 |
| parents | e06abfde6c39 |
| children | 750a7e125546 |
| rev | line source |
|---|---|
| 0 | 1 #include "dmlib.h" |
| 2 #include <stdarg.h> | |
| 3 | |
| 813 | 4 |
| 5 /* Returns the filename and path without the last filename extension, | |
| 6 * E.g. everything before the last '.', if any. | |
| 7 */ | |
| 8 char *dm_basefilename(const char *filename) | |
| 9 { | |
| 10 char *tmp, *fext; | |
| 11 | |
| 12 if (filename == NULL || | |
| 13 (tmp = dm_strdup(filename)) == NULL) | |
| 14 return NULL; | |
| 15 | |
| 16 if ((fext = strrchr(tmp, '.')) != NULL) | |
| 17 { | |
| 18 char *fpath = strrchr(tmp, DM_DIR_SEPARATOR); | |
| 19 if (fpath == NULL || (fpath != NULL && fext > fpath)) | |
| 20 *fext = 0; | |
| 21 } | |
| 22 | |
| 23 return tmp; | |
| 24 } | |
| 25 | |
| 26 | |
| 27 /* Replace filename extension based on format pattern. | |
| 28 * Usage: res = dm_strdup_fext(orig_filename, "foo_%s.cmp"); | |
| 29 */ | |
| 30 char *dm_strdup_fext(const char *filename, const char *fmt) | |
| 31 { | |
| 32 char *result, *tmp; | |
| 33 | |
| 34 if ((tmp = dm_basefilename(filename)) == NULL) | |
| 35 return NULL; | |
| 36 | |
| 37 result = dm_strdup_printf(fmt, tmp); | |
| 38 | |
| 39 dmFree(tmp); | |
| 40 | |
| 41 return result; | |
| 42 } | |
| 43 | |
| 44 | |
| 817 | 45 /* Check if end of the given string str matches needle |
| 46 * case-insensitively, return pointer to start of the match, | |
| 47 * if found, NULL otherwise. | |
| 48 */ | |
| 816 | 49 char *dm_strrcasecmp(char *str, const char *needle) |
| 50 { | |
| 51 if (str == NULL || needle == NULL) | |
| 52 return NULL; | |
| 53 | |
| 54 const size_t | |
| 55 slen = strlen(str), | |
| 56 nlen = strlen(needle); | |
|
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57 |
| 816 | 58 if (slen < nlen) |
| 59 return NULL; | |
| 60 | |
| 61 if (strcasecmp(str - nlen - 1, needle) == 0) | |
| 62 return str - nlen - 1; | |
| 63 else | |
| 64 return NULL; | |
| 65 } | |
| 66 | |
| 67 | |
|
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68 /* Implementation of strdup() with a NULL check |
| 0 | 69 */ |
| 70 char *dm_strdup(const char *s) | |
| 71 { | |
| 72 char *res; | |
| 73 if (s == NULL) | |
| 74 return NULL; | |
| 75 | |
| 76 if ((res = dmMalloc(strlen(s) + 1)) == NULL) | |
| 77 return NULL; | |
| 78 | |
| 79 strcpy(res, s); | |
| 80 return res; | |
| 81 } | |
| 82 | |
| 83 | |
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84 /* Implementation of strndup() with NULL check |
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85 */ |
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86 char *dm_strndup(const char *s, const size_t n) |
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87 { |
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88 char *res; |
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89 if (s == NULL) |
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90 return NULL; |
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91 |
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92 size_t len = strlen(s); |
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93 if (len > n) |
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94 len = n; |
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95 |
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96 if ((res = dmMalloc(len + 1)) == NULL) |
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97 return NULL; |
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98 |
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99 memcpy(res, s, len); |
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100 res[len] = 0; |
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101 |
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102 return res; |
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103 } |
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104 |
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105 |
| 0 | 106 /* Simulate a sprintf() that allocates memory |
| 107 */ | |
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108 char *dm_strdup_vprintf_len(const char *fmt, va_list args, int *len) |
| 0 | 109 { |
| 110 int size = 64; | |
| 836 | 111 char *buf, *tmp; |
| 0 | 112 |
| 113 if ((buf = dmMalloc(size)) == NULL) | |
| 114 return NULL; | |
| 115 | |
| 116 while (1) | |
| 117 { | |
| 118 va_list ap; | |
| 119 va_copy(ap, args); | |
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120 *len = vsnprintf(buf, size, fmt, ap); |
| 0 | 121 va_end(ap); |
| 122 | |
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123 if (*len > -1 && *len < size) |
| 0 | 124 return buf; |
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125 if (*len > -1) |
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126 size = *len + 1; |
| 0 | 127 else |
| 128 size *= 2; | |
| 129 | |
| 836 | 130 if ((tmp = dmRealloc(buf, size)) == NULL) |
| 131 { | |
| 132 dmFree(buf); | |
| 0 | 133 return NULL; |
| 836 | 134 } |
| 135 else | |
| 136 buf = tmp; | |
| 0 | 137 } |
| 138 } | |
| 139 | |
| 140 | |
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141 char *dm_strdup_vprintf(const char *fmt, va_list args) |
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142 { |
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143 int len; |
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144 return dm_strdup_vprintf_len(fmt, args, &len); |
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145 } |
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146 |
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147 |
| 0 | 148 char *dm_strdup_printf(const char *fmt, ...) |
| 149 { | |
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150 int len; |
| 0 | 151 char *res; |
| 152 va_list ap; | |
| 153 | |
| 154 va_start(ap, fmt); | |
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155 res = dm_strdup_vprintf_len(fmt, ap, &len); |
| 0 | 156 va_end(ap); |
| 157 | |
| 158 return res; | |
| 159 } |