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 #pragma ident "%Z%%M% %I% %E% SMI"
21
22 #include "includes.h"
23
24 #ifndef HAVE_VASPRINTF
25
26 #include <errno.h>
27 #include <stdarg.h>
28 #include <stdlib.h>
29
30 #ifndef VA_COPY
31 #ifdef HAVE_VA_COPY
32 #define VA_COPY(dest, src) va_copy(dest, src)
33 #else
34 #ifdef HAVE___VA_COPY
35 #define VA_COPY(dest, src) __va_copy(dest, src)
36 #else
37 #define VA_COPY(dest, src) (dest) = (src)
38 #endif
39 #endif
40 #endif
41
42 #define INIT_SZ 128
43
44 int
vasprintf(char ** str,const char * fmt,va_list ap)45 vasprintf(char **str, const char *fmt, va_list ap)
46 {
47 int ret = -1;
48 va_list ap2;
49 char *string, *newstr;
50 size_t len;
51
52 VA_COPY(ap2, ap);
53 if ((string = malloc(INIT_SZ)) == NULL)
54 goto fail;
55
56 ret = vsnprintf(string, INIT_SZ, fmt, ap2);
57 if (ret >= 0 && ret < INIT_SZ) { /* succeeded with initial alloc */
58 *str = string;
59 } else if (ret == INT_MAX || ret < 0) { /* Bad length */
60 free(string);
61 goto fail;
62 } else { /* bigger than initial, realloc allowing for nul */
63 len = (size_t)ret + 1;
64 if ((newstr = realloc(string, len)) == NULL) {
65 free(string);
66 goto fail;
67 } else {
68 va_end(ap2);
69 VA_COPY(ap2, ap);
70 ret = vsnprintf(newstr, len, fmt, ap2);
71 if (ret >= 0 && (size_t)ret < len) {
72 *str = newstr;
73 } else { /* failed with realloc'ed string, give up */
74 free(newstr);
75 goto fail;
76 }
77 }
78 }
79 va_end(ap2);
80 return (ret);
81
82 fail:
83 *str = NULL;
84 errno = ENOMEM;
85 va_end(ap2);
86 return (-1);
87 }
88 #endif
89
90 #ifndef HAVE_ASPRINTF
91 int
asprintf(char ** str,const char * fmt,...)92 asprintf(char **str, const char *fmt, ...)
93 {
94 va_list ap;
95 int ret;
96
97 *str = NULL;
98 va_start(ap, fmt);
99 ret = vasprintf(str, fmt, ap);
100 va_end(ap);
101
102 return (ret);
103 }
104 #endif
105