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annotate port/asprintf.c @ 287:c6a6bf42232b

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author David Demelier <markand@malikania.fr>
date Wed, 12 Nov 2014 12:46:16 +0100
parents 4c9b2a3f2396
children
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1 /*
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2 * asprintf.c -- basic port of asprintf / vsprintf functions
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3 *
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4 * Copyright (c) 2011, 2012 David Demelier <markand@malikania.fr>
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5 *
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6 * Permission to use, copy, modify, and/or distribute this software for any
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7 * purpose with or without fee is hereby granted, provided that the above
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8 * copyright notice and this permission notice appear in all copies.
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9 *
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10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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17 */
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18
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19 #include <stdio.h>
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20 #include <stdlib.h>
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21 #include <string.h>
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22 #include <stdarg.h>
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23
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24 /*
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25 * The Microsoft implementation relies on the Win32 API function
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26 * _vscprintf which count the number of characters needed. Otherwise the C99
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27 * function vsnprintf returns the number of character that would be printed.
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28 *
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29 * Finally, if we don't have C99, we use an optimistic function.
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30 *
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31 * The asprintf function is common to every implementations.
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32 */
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33
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34 #if defined(_MSC_VER)
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35
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36 /*
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37 * Windows implementation.
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38 */
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39 int
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40 vasprintf(char **res, const char *fmt, va_list ap)
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41 {
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42 int total = _vscprintf(fmt, ap);
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43
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44 if (total < 0) {
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45 *res = NULL;
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46 return -1;
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47 }
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48
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49 if ((*res = (char *)malloc(sizeof (total) + 1)) == NULL)
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50 return -1;
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51
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52 return vsprintf_s(*res, total + 1, fmt, ap);
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53 }
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54
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55 #elif __STDC_VERSION__ >= 199901L
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56
227
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57 /*
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58 * C99 implementation using vsnprintf's return value.
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59 */
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60 int
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61 vasprintf(char **res, const char *fmt, va_list ap)
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62 {
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63 int total, nwritten;
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64 va_list copy;
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65
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66 va_copy(copy, ap);
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67 total = vsnprintf(NULL, 0, fmt, copy);
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68 va_end(copy);
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69
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70 if (total < 0) {
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71 *res = NULL;
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72 return total;
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73 }
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74
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75 if ((*res = malloc(total + 1)) == NULL)
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76 return -1;
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77
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78 if ((nwritten = vsnprintf(*res, total + 1, fmt, ap)) < 0) {
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79 free(*res);
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80 *res = NULL;
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81
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82 return -1;
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83 }
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84
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85 return nwritten;
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86 }
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87
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88 #else
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89
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90 /*
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91 * Optimistic function fallback.
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92 */
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93 int
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94 vasprintf(char **res, const char *format, va_list ap)
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95 {
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96 int rvalue, ok;
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97 size_t base = 80;
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98
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99 if ((*res = malloc(base)) == NULL)
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100 return -1;
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101
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102 ok = 0;
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103 do {
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104 rvalue = vsnprintf(*res, base, format, ap);
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105
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106 if ((signed int)base <= rvalue || rvalue < 0) {
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107 *res = realloc(*res, base * 2);
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108 base *= 2;
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109 } else
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110 ok = 1;
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111 } while (!ok && *res != NULL);
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112
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113 return rvalue;
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114 }
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115
227
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116 #endif
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117
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118 int
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119 asprintf(char **res, const char *fmt, ...)
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120 {
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121 va_list ap;
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122 int rvalue;
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123
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124 va_start(ap, fmt);
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125 rvalue = vasprintf(res, fmt, ap);
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126 va_end(ap);
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127
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128 return rvalue;
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129 }