1explain_ungetc_or_die(3)   Library Functions Manual   explain_ungetc_or_die(3)
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NAME

6       explain_ungetc_or_die  -  push  a character back to a stream and report
7       errors
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SYNOPSIS

10       #include <libexplain/ungetc.h>
11       void explain_ungetc_or_die(int c, FILE *fp);
12       int explain_ungetc_on_error(int c, FILE *fp);
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DESCRIPTION

15       The explain_ungetc_or_die function is used to call the ungetc(3) system
16       call.  On  failure  an  explanation will be printed to stderr, obtained
17       from the explain_ungetc(3) function, and then the process terminates by
18       calling exit(EXIT_FAILURE).
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20       The explain_ungetc_on_error function is used to call the ungetc(3) sys‐
21       tem call. On failure an explanation will be printed to stderr, obtained
22       from the explain_ungetc(3) function, but still returns to the caller.
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24       c       The c, exactly as to be passed to the ungetc(3) system call.
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26       fp      The fp, exactly as to be passed to the ungetc(3) system call.
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RETURN VALUE

29       The   explain_ungetc_or_die  function  only  returns  on  success,  see
30       ungetc(3) for more information. On failure, prints an  explanation  and
31       exits, it does not return.
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33       The explain_ungetc_on_error function always returns the value return by
34       the wrapped ungetc(3) system call.
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EXAMPLE

37       The explain_ungetc_or_die function is intended to be used in a  fashion
38       similar to the following example:
39              explain_ungetc_or_die(c, fp);
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SEE ALSO

42       ungetc(3)
43               push a character back to a stream
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45       explain_ungetc(3)
46               explain ungetc(3) errors
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48       exit(2) terminate the calling process
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51       libexplain version 1.4
52       Copyright (C) 2010 Peter Miller
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56                                                      explain_ungetc_or_die(3)
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