asprintf, vasprintf − print to allocated string


     , const char *int asprintf(char **strp

     , const char *int vasprintf(char **strp

The functions and are analogs of and 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 to
release the allocated storage when it is no longer needed.

When successful, these functions return the number of bytes
printed, just like If memory allocation wasn’t possible, or
some other error occurs, these functions will return −1, and
the contents of strp are undefined.

For an explanation of the terms used in this section, see

│Interface               Attribute     Value          │
│                        │ Thread safety MT‐Safe locale │

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.

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