Originální popis anglicky:
asprintf, vasprintf - print to allocated string
Návod, kniha: Linux Programmer's Manual
#define _GNU_SOURCE
#include <stdio.h>
int asprintf(char **strp, const char *fmt,
...);
int vasprintf(char **strp, const char *fmt,
va_list ap);
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.
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.
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.
free(3),
malloc(3),
printf(3)
