[MPlayer-users] asprintf undefined
Carsten Koch
Carsten.Koch at icem.com
Mon Dec 8 19:57:09 CET 2003
Steven M. Schultz wrote:
...
> What is 'asprintf' and where would one expect to find it?
% man asprintf
ASPRINTF(3) Linux Programmer's Manual ASPRINTF(3)
NAME
asprintf, vasprintf - print to allocated string
SYNOPSIS
#define _GNU_SOURCE
#include <stdio.h>
int asprintf(char **strp, const char *fmt, ...);
int vasprintf(char **strp, const char *fmt, va_list ap);
DESCRIPTION
The functions asprintf and vasprintf are analogues of sprintf and vsprintf, except that they allocate a string large enough to hold the output including the terminating NUL, and return
a pointer to it via the first parameter. This pointer should be passed to free(3) to release the allocated storage when it is no longer needed.
RETURN VALUE
When successful, these functions return the number of bytes printed, just like sprintf(3). If memory allocation wasn't possible, or some other error occurs, these functions will
return -1, and the contents of strp is undefined.
NOTES
These functions are GNU extensions, not in C or POSIX. They are also available under *BSD. The FreeBSD implementation sets strp to NULL on error.
SEE ALSO
free(3), malloc(3), printf(3)
GNU 2001-12-18 ASPRINTF(3)
% nm /usr/lib/libc.a|fgrep asprintf
U __asprintf
U __asprintf
asprintf.o:
U _IO_vasprintf
00000000 T __asprintf
00000000 W asprintf
U __asprintf
vasprintf.o:
00000000 T _IO_vasprintf
00000000 W vasprintf
U __asprintf
U __asprintf
U __asprintf
U __asprintf
U __asprintf
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