explain_ungetc_or_die3
Push a character back to a stream and report errors
Usage
#include <libexplain/ungetc.h>
void explain_ungetc_or_die(int c, FILE *fp);
int explain_ungetc_on_error(int c, FILE *fp);
Overview
The explain_ungetc_or_die function is used to call the ungetc(3) system call. On failure an explanation will be printed to stderr, obtained from the explain_ungetc(3) function, and then the process terminates by calling exit(EXIT_FAILURE).
The explain_ungetc_on_error function is used to call the ungetc(3) system call. On failure an explanation will be printed to stderr, obtained from the explain_ungetc(3) function, but still returns to the caller.
c
|
The c, exactly as to be passed to the ungetc(3) system call. |
|---|---|
fp
|
The fp, exactly as to be passed to the ungetc(3) system call. |
Return value
The explain_ungetc_or_die function only returns on success, see ungetc(3) for more information. On failure, prints an explanation and exits, it does not return.
The explain_ungetc_on_error function always returns the value return by the wrapped ungetc(3) system call.
Examples
The explain_ungetc_or_die function is intended to be used in a fashion similar to the following example:
explain_ungetc_or_die(c, fp);Releases
6 releases since Debian 7 (Wheezy); the text changed 1 time.