GETC(S) XENIX System V GETC(S)
Name
getc, getchar, fgetc, getw - Gets character or word from a
stream.
Syntax
#include <stdio.h>
int getc (stream)
FILE *stream;
int getchar ()
int fgetc (stream)
FILE *stream;
int getw (stream)
FILE *stream;
Description
getc and getchar are macros. getc returns the next
character from the named input stream as an integer. It
also moves the file pointer, if defined, ahead one character
in stream. getchar() is identical to getc(stdin).
fgetc behaves like getc, but is a genuine function, not a
macro; it may therefore be used as an argument. fgetc runs
more slowly than getc, but takes less space per invocation.
getw returns the next word from the named input stream.
getw increments the associated file pointer, if defined, to
point to the next word. The size of a word is the same as
an integer and varies from machine to machine. getw assumes
no special alignment in the file.
See Also
ferror(S), fopen(S), fread(S), gets(S), putc(S), scanf(S)
Diagnostics
These functions return the integer constant EOF at the end-
of-file or upon a read error. Because EOF is a valid
integer, ferror(S) should be used to detect getw errors.
Notes
stream arguments with side effects are treated incorrectly
because getc is implemented as a macro. In particular,
``getc( *f++ )'' doesn't work properly. fgetc should be
used instead.
Files written using putw(S) are machine-dependent and may
not be read using getw on a different processor because of
possible differences in word length and byte ordering.
Page 1 (printed 8/7/87)
GETC(S) XENIX System V GETC(S)
Warning
If the integer value returned by getc, getchar, or fgetc is
stored into a character variable and then compared against
the integer constant EOF, the comparison may never succeed
because sign-extension of a character on widening to integer
is machine-dependent.
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