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annotate common/strhelp.c @ 60:6acb1dae6185

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Use strn functions and improve error handling. Even if we know the strings are NULL terminated we use length terminated string functions after a first strlen this makes it easier to assert that at one point we know the string is terminated and afterwards use the length of that.
author Andre Heinecke <aheinecke@intevation.de>
date Tue, 18 Mar 2014 11:28:02 +0000
parents 3f6378647371
children 355800cdefcc
rev   line source
59
3f6378647371 Start work on cinst. Strhelp new helpers to work with C String
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1
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2 #include <stdio.h>
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3 #include <stdlib.h>
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4 #include <string.h>
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5 #include <assert.h>
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6
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7 static void
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8 out_of_core(void)
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9 {
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10 fputs("\nfatal: out of memory\n", stderr);
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11 exit(2);
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12 }
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13 void *
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14 xmalloc( size_t n )
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15 {
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16 void *p = malloc( n );
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17 if( !p )
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18 out_of_core();
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19 return p;
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20 }
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21
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22 void *
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23 xrealloc( void *a, size_t n )
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24 {
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25 void *p = realloc( a, n );
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26 if( !p )
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27 out_of_core();
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28 return p;
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29 }
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30
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31 char *
60
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32 xstrndup( const char *string, const size_t len )
59
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33 {
60
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34 char *p = xmalloc( len + 1 );
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35 memcpy( p, string, len );
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36 p[len] = '\0';
59
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37 return p;
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38 }
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39
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40 unsigned int
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41 strv_length (char **str_array)
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42 {
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43 unsigned int i = 0;
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44
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45 if (!str_array)
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46 return 0;
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47
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48 while (str_array[i])
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49 ++i;
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50
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51 return i;
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52 }
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53
60
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54 void array_append_str(char ***pArray, const char *string, const size_t len)
59
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55 {
60
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56 unsigned int old_len = 0;
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57
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58 if (!*pArray) {
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59 *pArray = xmalloc(2 * sizeof(char*));
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60 (*pArray)[0] = xstrndup(string, len);
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61 (*pArray)[1] = NULL;
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62 return;
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63 }
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64 old_len = strv_length(*pArray);
59
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65 *pArray = xrealloc(*pArray, sizeof(char**) * (old_len + 2));
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66
60
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67 (*pArray)[old_len] = xstrndup(string, len);
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68 (*pArray)[old_len + 1] = NULL;
59
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69 }
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70
60
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71 void str_append_str(char **pDst, const char *appendage, const size_t len)
59
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72 {
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73 if (!appendage)
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74 return;
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75
60
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76 if (!*pDst) {
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77 *pDst = xstrndup(appendage, len);
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78 } else {
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79 size_t old_len = strlen(*pDst);
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80 size_t new_len = old_len + len + 1;
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81 *pDst = (char *)xrealloc(*pDst, sizeof(char) * (new_len));
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82 strncpy(*pDst + old_len, appendage, new_len);
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83 *pDst[new_len] = '\0';
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84 }
59
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85 }
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86
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87 void
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88 strfreev (char **str_array)
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89 {
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90 if (str_array)
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91 {
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92 int i;
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93
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94 for (i = 0; str_array[i] != NULL; i++)
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95 free (str_array[i]);
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96
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97 free (str_array);
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98 }
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99 }
http://wald.intevation.org/projects/trustbridge/