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| 1 | +/* src/port/asprintf.c */ |
| 2 | + |
| 3 | +/* $NetBSD: asprintf.c,v 1.3 2012/07/02 16:02:53 joerg Exp $ */ |
| 4 | + |
| 5 | +/*- |
| 6 | + * Copyright (c) 2007 Joerg Sonnenberger <joerg@NetBSD.org>. |
| 7 | + * All rights reserved. |
| 8 | + * |
| 9 | + * Redistribution and use in source and binary forms, with or without |
| 10 | + * modification, are permitted provided that the following conditions |
| 11 | + * are met: |
| 12 | + * |
| 13 | + * 1. Redistributions of source code must retain the above copyright |
| 14 | + * notice, this list of conditions and the following disclaimer. |
| 15 | + * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | + * notice, this list of conditions and the following disclaimer in |
| 17 | + * the documentation and/or other materials provided with the |
| 18 | + * distribution. |
| 19 | + * |
| 20 | + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 21 | + * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 22 | + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| 23 | + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| 24 | + * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 25 | + * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| 26 | + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| 27 | + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| 28 | + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| 29 | + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| 30 | + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 31 | + * SUCH DAMAGE. |
| 32 | + */ |
| 33 | + |
| 34 | +#include "c.h" |
| 35 | + |
| 36 | +#define HAVE_VA_COPY 1 |
| 37 | + |
| 38 | +int |
| 39 | +asprintf(char **ret, const char *fmt, ...) |
| 40 | +{ |
| 41 | + va_list ap; |
| 42 | + int retval; |
| 43 | + |
| 44 | + va_start(ap, fmt); |
| 45 | + retval = vasprintf(ret, fmt, ap); |
| 46 | + va_end(ap); |
| 47 | + |
| 48 | + return retval; |
| 49 | +} |
| 50 | + |
| 51 | +int |
| 52 | +vasprintf(char **ret, const char *fmt, va_list ap) |
| 53 | +{ |
| 54 | + char *buf, *new_buf; |
| 55 | + size_t len; |
| 56 | + int retval; |
| 57 | + va_list ap2; |
| 58 | + |
| 59 | + len = 128; |
| 60 | + buf = malloc(len); |
| 61 | + if (buf == NULL) { |
| 62 | + *ret = NULL; |
| 63 | + return -1; |
| 64 | + } |
| 65 | + |
| 66 | +#if defined(HAVE_VA_COPY) |
| 67 | + va_copy(ap2, ap); |
| 68 | +#define my_va_end(ap2) va_end(ap2) |
| 69 | +#elif defined(HAVE___BUILTIN_VA_COPY) |
| 70 | + __builtin_va_copy(ap2, ap); |
| 71 | +#define my_va_end(ap2) __builtin_va_end(ap2) |
| 72 | +#else |
| 73 | + ap2 = ap; |
| 74 | +#define my_va_end(ap2) do {} while (0) |
| 75 | +#endif |
| 76 | + retval = vsnprintf(buf, len, fmt, ap); |
| 77 | + if (retval < 0) { |
| 78 | + free(buf); |
| 79 | + *ret = NULL; |
| 80 | + va_end(ap2); |
| 81 | + return -1; |
| 82 | + } |
| 83 | + |
| 84 | + if (retval < len) { |
| 85 | + new_buf = realloc(buf, retval + 1); |
| 86 | + if (new_buf == NULL) |
| 87 | + *ret = buf; |
| 88 | + else |
| 89 | + *ret = new_buf; |
| 90 | + my_va_end(ap2); |
| 91 | + return retval; |
| 92 | + } |
| 93 | + |
| 94 | + len = (size_t)retval + 1; |
| 95 | + free(buf); |
| 96 | + buf = malloc(len); |
| 97 | + if (buf == NULL) { |
| 98 | + *ret = NULL; |
| 99 | + my_va_end(ap2); |
| 100 | + return -1; |
| 101 | + } |
| 102 | + retval = vsnprintf(buf, len, fmt, ap2); |
| 103 | + my_va_end(ap2); |
| 104 | + if (retval != len - 1) { |
| 105 | + free(buf); |
| 106 | + *ret = NULL; |
| 107 | + return -1; |
| 108 | + } |
| 109 | + *ret = buf; |
| 110 | + return retval; |
| 111 | +} |
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