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| explain_ungetc_or_die(3) | FreeBSD Library Functions Manual | explain_ungetc_or_die(3) |
NAME
explain_ungetc_or_die - push a character back to a stream and report errorsSYNOPSIS
#include <libexplain/ungetc.h>void explain_ungetc_or_die(int c, FILE *fp);
int explain_ungetc_on_error(int c, FILE *fp);
DESCRIPTION
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.
EXAMPLE
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);
SEE ALSO
- ungetc(3)
- push a character back to a stream
- explain_ungetc(3)
- explain ungetc(3) errors
- exit(2)
- terminate the calling process
COPYRIGHT
libexplain version 1.3Copyright (C) 2010 Peter Miller
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