1 /*
2 * Copyright (c) 2004 Darren Tucker.
3 *
4 * Based originally on asprintf.c from OpenBSD:
5 * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
6 *
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 */
19
20 #include "includes.h"
21
22 /*
23 * Don't let systems with broken printf(3) avoid our replacements
24 * via asprintf(3)/vasprintf(3) calling libc internally.
25 */
26 #if defined(BROKEN_SNPRINTF)
27 # undef HAVE_VASPRINTF
28 # undef HAVE_ASPRINTF
29 #endif
30
31 #ifndef HAVE_VASPRINTF
32
33 #include <errno.h>
34 #include <stdarg.h>
35 #include <stdio.h>
36 #include <stdlib.h>
37
38 #define INIT_SZ 128
39
40 int
vasprintf(char ** str,const char * fmt,va_list ap)41 vasprintf(char **str, const char *fmt, va_list ap)
42 {
43 int ret = -1;
44 va_list ap2;
45 char *string, *newstr;
46 size_t len;
47
48 VA_COPY(ap2, ap);
49 if ((string = malloc(INIT_SZ)) == NULL)
50 goto fail;
51
52 ret = vsnprintf(string, INIT_SZ, fmt, ap2);
53 if (ret >= 0 && ret < INIT_SZ) { /* succeeded with initial alloc */
54 *str = string;
55 } else if (ret == INT_MAX || ret < 0) { /* Bad length */
56 free(string);
57 goto fail;
58 } else { /* bigger than initial, realloc allowing for nul */
59 len = (size_t)ret + 1;
60 if ((newstr = realloc(string, len)) == NULL) {
61 free(string);
62 goto fail;
63 } else {
64 va_end(ap2);
65 VA_COPY(ap2, ap);
66 ret = vsnprintf(newstr, len, fmt, ap2);
67 if (ret >= 0 && (size_t)ret < len) {
68 *str = newstr;
69 } else { /* failed with realloc'ed string, give up */
70 free(newstr);
71 goto fail;
72 }
73 }
74 }
75 va_end(ap2);
76 return (ret);
77
78 fail:
79 *str = NULL;
80 errno = ENOMEM;
81 va_end(ap2);
82 return (-1);
83 }
84 #endif
85
86 #ifndef HAVE_ASPRINTF
asprintf(char ** str,const char * fmt,...)87 int asprintf(char **str, const char *fmt, ...)
88 {
89 va_list ap;
90 int ret;
91
92 *str = NULL;
93 va_start(ap, fmt);
94 ret = vasprintf(str, fmt, ap);
95 va_end(ap);
96
97 return ret;
98 }
99 #endif
100