vasprintf man page on Manjaro

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ASPRINTF(3)		   Linux Programmer's Manual		   ASPRINTF(3)

       asprintf, vasprintf - print to allocated string

       #define _GNU_SOURCE	   /* See feature_test_macros(7) */
       #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 analogs of sprintf(3) and
       vsprintf(3), except that they allocate a string large  enough  to  hold
       the  output  including  the  terminating null byte ('\0'), and return a
       pointer to it via the first argument.  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

       free(3), malloc(3), printf(3)

       This page is part of release 3.65 of the Linux  man-pages  project.   A
       description  of	the project, and information about reporting bugs, can
       be found at

GNU				  2013-06-21			   ASPRINTF(3)

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