Mercurial > hg > dmlib

annotate src/dmstring.c @ 812:1e5cf1144f36

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Move library source under src/ subdirectory.
author Matti Hamalainen <ccr@tnsp.org>
date Fri, 16 May 2014 03:22:39 +0300
parents dmstring.c@2726d91e3409
children b0cd28b6c9f3
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1 #include "dmlib.h"
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2 #include <stdarg.h>
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3
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4 /* Implementation of strdup() with a NULL check
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5 */
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6 char *dm_strdup(const char *s)
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7 {
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8 char *res;
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9 if (s == NULL)
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10 return NULL;
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11
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12 if ((res = dmMalloc(strlen(s) + 1)) == NULL)
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13 return NULL;
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14
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15 strcpy(res, s);
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16 return res;
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17 }
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18
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19
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20 /* Implementation of strndup() with NULL check
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21 */
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22 char *dm_strndup(const char *s, const size_t n)
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23 {
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24 char *res;
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25 if (s == NULL)
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26 return NULL;
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27
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28 size_t len = strlen(s);
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29 if (len > n)
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30 len = n;
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31
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32 if ((res = dmMalloc(len + 1)) == NULL)
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33 return NULL;
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34
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35 memcpy(res, s, len);
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36 res[len] = 0;
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37
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38 return res;
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39 }
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41
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42 /* Simulate a sprintf() that allocates memory
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43 */
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44 char *dm_strdup_vprintf(const char *fmt, va_list args)
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45 {
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46 int size = 64;
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47 char *buf;
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48
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49 if ((buf = dmMalloc(size)) == NULL)
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50 return NULL;
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51
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52 while (1)
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53 {
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54 int n;
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55 va_list ap;
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56 va_copy(ap, args);
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57 n = vsnprintf(buf, size, fmt, ap);
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58 va_end(ap);
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59
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60 if (n > -1 && n < size)
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61 return buf;
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62 if (n > -1)
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63 size = n + 1;
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64 else
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65 size *= 2;
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66
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67 if ((buf = dmRealloc(buf, size)) == NULL)
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68 return NULL;
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69 }
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70 }
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71
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72
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73 char *dm_strdup_printf(const char *fmt, ...)
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74 {
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75 char *res;
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76 va_list ap;
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77
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78 va_start(ap, fmt);
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79 res = dm_strdup_vprintf(fmt, ap);
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80 va_end(ap);
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81
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82 return res;
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83 }