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RedHat 9 (Linux i386) - man page for asprintf (redhat section 3)

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)


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