1 /* sprintf_alloc.c -- like sprintf with memory allocation
5 Copyright (C) 2001 University of Southern California
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
20 #include "sprintf_alloc.h"
21 #include "libbb/libbb.h"
23 int sprintf_alloc(char **str
, const char *fmt
, ...)
30 opkg_msg(ERROR
, "Internal error: str=NULL.\n");
34 opkg_msg(ERROR
, "Internal error: fmt=NULL.\n");
38 /* On x86_64 systems, any strings over 100 were segfaulting.
39 It seems that the ap needs to be reinitalized before every
40 use of the v*printf() functions. I pulled the functionality out
41 of vsprintf_alloc and combined it all here instead.
45 /* ripped more or less straight out of PRINTF(3) */
47 *str
= xcalloc(1, size
);
51 n
= vsnprintf (*str
, size
, fmt
, ap
);
53 /* If that worked, return the size. */
54 if (n
> -1 && n
< size
)
56 /* Else try again with more space. */
57 if (n
> -1) /* glibc 2.1 */
58 size
= n
+1; /* precisely what is needed */
60 size
*= 2; /* twice the old size */
61 *str
= xrealloc(*str
, size
);
64 return -1; /* Just to be correct - it probably won't get here */