Mercurial > hg > dmlib
annotate src/dmstring.c @ 813:b0cd28b6c9f3
Add new utility functions.
| author | Matti Hamalainen <ccr@tnsp.org> |
|---|---|
| date | Fri, 16 May 2014 15:17:48 +0300 |
| parents | 1e5cf1144f36 |
| children | 091461e0213f |
| 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 | |
|
744
2726d91e3409
Add implementation of dm_strndup().
Matti Hamalainen <ccr@tnsp.org>
parents:
0
diff
changeset
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45 /* Implementation of strdup() with a NULL check |
| 0 | 46 */ |
| 47 char *dm_strdup(const char *s) | |
| 48 { | |
| 49 char *res; | |
| 50 if (s == NULL) | |
| 51 return NULL; | |
| 52 | |
| 53 if ((res = dmMalloc(strlen(s) + 1)) == NULL) | |
| 54 return NULL; | |
| 55 | |
| 56 strcpy(res, s); | |
| 57 return res; | |
| 58 } | |
| 59 | |
| 60 | |
|
744
2726d91e3409
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Matti Hamalainen <ccr@tnsp.org>
parents:
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diff
changeset
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61 /* Implementation of strndup() with NULL check |
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62 */ |
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63 char *dm_strndup(const char *s, const size_t n) |
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64 { |
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65 char *res; |
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66 if (s == NULL) |
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67 return NULL; |
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68 |
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69 size_t len = strlen(s); |
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70 if (len > n) |
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71 len = n; |
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72 |
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73 if ((res = dmMalloc(len + 1)) == NULL) |
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Matti Hamalainen <ccr@tnsp.org>
parents:
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74 return NULL; |
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parents:
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75 |
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76 memcpy(res, s, len); |
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77 res[len] = 0; |
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parents:
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78 |
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79 return res; |
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Matti Hamalainen <ccr@tnsp.org>
parents:
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80 } |
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Matti Hamalainen <ccr@tnsp.org>
parents:
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changeset
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81 |
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parents:
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diff
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82 |
| 0 | 83 /* Simulate a sprintf() that allocates memory |
| 84 */ | |
| 85 char *dm_strdup_vprintf(const char *fmt, va_list args) | |
| 86 { | |
| 87 int size = 64; | |
| 88 char *buf; | |
| 89 | |
| 90 if ((buf = dmMalloc(size)) == NULL) | |
| 91 return NULL; | |
| 92 | |
| 93 while (1) | |
| 94 { | |
| 95 int n; | |
| 96 va_list ap; | |
| 97 va_copy(ap, args); | |
| 98 n = vsnprintf(buf, size, fmt, ap); | |
| 99 va_end(ap); | |
| 100 | |
| 101 if (n > -1 && n < size) | |
| 102 return buf; | |
| 103 if (n > -1) | |
| 104 size = n + 1; | |
| 105 else | |
| 106 size *= 2; | |
| 107 | |
| 108 if ((buf = dmRealloc(buf, size)) == NULL) | |
| 109 return NULL; | |
| 110 } | |
| 111 } | |
| 112 | |
| 113 | |
| 114 char *dm_strdup_printf(const char *fmt, ...) | |
| 115 { | |
| 116 char *res; | |
| 117 va_list ap; | |
| 118 | |
| 119 va_start(ap, fmt); | |
| 120 res = dm_strdup_vprintf(fmt, ap); | |
| 121 va_end(ap); | |
| 122 | |
| 123 return res; | |
| 124 } |