NAME
putc — put a byte
on a stream
SYNOPSIS
#include
<stdio.h>
int putc(int c, FILE *stream);
DESCRIPTION
[CX] The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 (“POSIX.1”) defers to the ISO C standard.
The putc () function shall be equivalent
to fputc(3), except that if it is implemented as a macro
it may evaluate stream more than once, so the argument
should never be an expression with side effects.
RETURN VALUE
Refer to fputc(3).
ERRORS
Refer to fputc(3).
EXAMPLES
None.
APPLICATION USAGE
Since it may be implemented as a macro,
putc () may treat a stream
argument with side effects incorrectly. In particular,
putc (
c, *
f ++) does not
necessarily work correctly. Therefore, use of this function is not
recommended in such situations; fputc(3) should be used
instead.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
fputc(3), the Base Definitions volume of IEEE Std 1003.1-2001 (“POSIX.1”), <stdio.h>
CHANGE HISTORY
First released in Issue 1. Derived from Issue 1 of the SVID.
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