Mercurial > code
annotate port/C/asprintf.c @ 614:687b42509012
Misc: remove strip, there is alternative in boost
| author | David Demelier <markand@malikania.fr> |
|---|---|
| date | Mon, 21 Aug 2017 11:14:05 +0200 |
| parents | f48bb09bccc7 |
| children | 266f32919d0a |
| rev | line source |
|---|---|
| 486 | 1 /* |
| 2 * asprintf.c -- basic port of asprintf / vsprintf functions | |
| 3 * | |
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4 * Copyright (c) 2011-2016 David Demelier <markand@malikania.fr> |
| 486 | 5 * |
| 6 * Permission to use, copy, modify, and/or distribute this software for any | |
| 7 * purpose with or without fee is hereby granted, provided that the above | |
| 8 * copyright notice and this permission notice appear in all copies. | |
| 9 * | |
| 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | |
| 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
| 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
| 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
| 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
| 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
| 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
| 17 */ | |
| 18 | |
| 19 #include <stdio.h> | |
| 20 #include <stdlib.h> | |
| 21 #include <string.h> | |
| 22 #include <stdarg.h> | |
| 23 | |
| 24 /* | |
| 25 * The Microsoft implementation relies on the Win32 API function | |
| 26 * _vscprintf which count the number of characters needed. Otherwise the C99 | |
| 27 * function vsnprintf returns the number of character that would be printed. | |
| 28 * | |
| 29 * Finally, if we don't have C99, we use an optimistic function. | |
| 30 * | |
| 31 * The asprintf function is common to every implementations. | |
| 32 */ | |
| 33 | |
| 34 #if defined(_MSC_VER) | |
| 35 | |
| 36 /* | |
| 37 * Windows implementation. | |
| 38 */ | |
| 39 int | |
| 40 vasprintf(char **res, const char *fmt, va_list ap) | |
| 41 { | |
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42 int total = _vscprintf(fmt, ap); |
| 486 | 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 } |
| 486 | 48 |
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49 if ((*res = (char *)malloc(sizeof (total) + 1)) == NULL) |
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50 return -1; |
| 486 | 51 |
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parents:
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52 return vsprintf_s(*res, total + 1, fmt, ap); |
| 486 | 53 } |
| 54 | |
| 55 #elif __STDC_VERSION__ >= 199901L | |
| 56 | |
| 57 /* | |
| 58 * C99 implementation using vsnprintf's return value. | |
| 59 */ | |
| 60 int | |
| 61 vasprintf(char **res, const char *fmt, va_list ap) | |
| 62 { | |
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63 int total, nwritten; |
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64 va_list copy; |
| 486 | 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); |
| 486 | 69 |
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70 if (total < 0) { |
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parents:
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71 *res = NULL; |
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parents:
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72 return total; |
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parents:
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73 } |
| 486 | 74 |
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parents:
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75 if ((*res = malloc(total + 1)) == NULL) |
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f48bb09bccc7
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parents:
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76 return -1; |
| 486 | 77 |
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parents:
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78 if ((nwritten = vsnprintf(*res, total + 1, fmt, ap)) < 0) { |
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parents:
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79 free(*res); |
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parents:
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80 *res = NULL; |
| 486 | 81 |
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548
f48bb09bccc7
Misc: huge cleanup, switch to spaces
David Demelier <markand@malikania.fr>
parents:
543
diff
changeset
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82 return -1; |
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f48bb09bccc7
Misc: huge cleanup, switch to spaces
David Demelier <markand@malikania.fr>
parents:
543
diff
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83 } |
| 486 | 84 |
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548
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Misc: huge cleanup, switch to spaces
David Demelier <markand@malikania.fr>
parents:
543
diff
changeset
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85 return nwritten; |
| 486 | 86 } |
| 87 | |
| 88 #else | |
| 89 | |
| 90 /* | |
| 91 * Optimistic function fallback. | |
| 92 */ | |
| 93 int | |
| 94 vasprintf(char **res, const char *format, va_list ap) | |
| 95 { | |
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parents:
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96 int rvalue, ok; |
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f48bb09bccc7
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parents:
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97 size_t base = 80; |
| 486 | 98 |
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548
f48bb09bccc7
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David Demelier <markand@malikania.fr>
parents:
543
diff
changeset
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99 if ((*res = malloc(base)) == NULL) |
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f48bb09bccc7
Misc: huge cleanup, switch to spaces
David Demelier <markand@malikania.fr>
parents:
543
diff
changeset
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100 return -1; |
| 486 | 101 |
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548
f48bb09bccc7
Misc: huge cleanup, switch to spaces
David Demelier <markand@malikania.fr>
parents:
543
diff
changeset
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102 ok = 0; |
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f48bb09bccc7
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David Demelier <markand@malikania.fr>
parents:
543
diff
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103 do { |
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f48bb09bccc7
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David Demelier <markand@malikania.fr>
parents:
543
diff
changeset
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104 rvalue = vsnprintf(*res, base, format, ap); |
| 486 | 105 |
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548
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parents:
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diff
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106 if ((signed int)base <= rvalue || rvalue < 0) { |
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parents:
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diff
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107 *res = realloc(*res, base * 2); |
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parents:
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108 base *= 2; |
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parents:
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109 } else |
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f48bb09bccc7
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David Demelier <markand@malikania.fr>
parents:
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110 ok = 1; |
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f48bb09bccc7
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parents:
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111 } while (!ok && *res != NULL); |
| 486 | 112 |
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548
f48bb09bccc7
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David Demelier <markand@malikania.fr>
parents:
543
diff
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113 return rvalue; |
| 486 | 114 } |
| 115 | |
| 116 #endif | |
| 117 | |
| 118 int | |
| 119 asprintf(char **res, const char *fmt, ...) | |
| 120 { | |
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parents:
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121 va_list ap; |
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parents:
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122 int rvalue; |
| 486 | 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); |
| 486 | 127 |
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128 return rvalue; |
| 486 | 129 } |