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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