source: web/old/remctl-2.14/portable/asprintf.c @ f6f3e91

web
Last change on this file since f6f3e91 was f6f3e91, checked in by Jessica B. Hamrick <jhamrick@…>, 15 years ago

Preserve directory hierarchy (not sure what happened to it)

  • Property mode set to 100644
File size: 1.4 KB
Line 
1/*
2 * Replacement for a missing asprintf and vasprintf.
3 *
4 * Provides the same functionality as the standard GNU library routines
5 * asprintf and vasprintf for those platforms that don't have them.
6 *
7 * Written by Russ Allbery <rra@stanford.edu>
8 * This work is hereby placed in the public domain by its author.
9 */
10
11#include <config.h>
12#include <portable/system.h>
13
14/*
15 * If we're running the test suite, rename the functions to avoid conflicts
16 * with the system versions.
17 */
18#if TESTING
19# define asprintf test_asprintf
20# define vasprintf test_vasprintf
21int test_asprintf(char **, const char *, ...);
22int test_vasprintf(char **, const char *, va_list);
23#endif
24
25int
26asprintf(char **strp, const char *fmt, ...)
27{
28    va_list args;
29    int status;
30
31    va_start(args, fmt);
32    status = vasprintf(strp, fmt, args);
33    va_end(args);
34    return status;
35}
36
37int
38vasprintf(char **strp, const char *fmt, va_list args)
39{
40    va_list args_copy;
41    int status, needed;
42
43    va_copy(args_copy, args);
44    needed = vsnprintf(NULL, 0, fmt, args_copy);
45    va_end(args_copy);
46    if (needed < 0) {
47        *strp = NULL;
48        return needed;
49    }
50    *strp = malloc(needed + 1);
51    if (*strp == NULL)
52        return -1;
53    status = vsnprintf(*strp, needed + 1, fmt, args);
54    if (status >= 0)
55        return status;
56    else {
57        free(*strp);
58        *strp = NULL;
59        return status;
60    }
61}
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