libexplain  1.4.D001
Functions
libexplain/ungetc_on_error.c File Reference
#include <libexplain/ac/errno.h>
#include <libexplain/ac/stdio.h>
#include <libexplain/ungetc.h>
#include <libexplain/output.h>

Go to the source code of this file.

Functions

int explain_ungetc_on_error (int c, FILE *fp)

Function Documentation

int explain_ungetc_on_error ( int  c,
FILE *  fp 
)

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.

Parameters:
cThe c, exactly as to be passed to the ungetc(3) system call.
fpThe fp, exactly as to be passed to the ungetc(3) system call.
Returns:
The value returned by the wrapped ungetc(3) system call.
Example:
This function is intended to be used in a fashion similar to the following example:
 if (explain_ungetc_on_error(c, fp) < 0)
 {
     ...cope with error
     ...no need to print error message
 }

Definition at line 27 of file ungetc_on_error.c.