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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 null byte, 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.
CONFORMING TO
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)
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This page was generated on Sat Sep 8 16:36:32 GMT 2007
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