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GETC(3) Library Functions Manual GETC(3)

fgetc, getc, getchar, getw —
get next character or word from input stream

#include <stdio.h>

int
fgetc(FILE *stream);

int
getc(FILE *stream);

int
getchar(void);

int
getw(FILE *stream);

The fgetc() function obtains the next input character (if present) from the stream pointed at by stream, or the next character pushed back on the stream via ungetc(3).

The getc() function acts essentially identically to fgetc(), but is a macro that expands in-line.

The getchar() function is equivalent to getc() with the argument stdin.

The getw() function obtains the next int (if present) from the stream pointed at by stream.

If successful, these routines return the next requested object from the stream. If the stream is at end-of-file or a read error occurs, the routines return EOF. The routines feof(3) and ferror(3) must be used to distinguish between end-of-file and error. If an error occurs, the global variable errno is set to indicate the error. The end-of-file condition is remembered, even on a terminal, and all subsequent attempts to read will return EOF until the condition is cleared with clearerr(3).

ferror(3), fopen(3), fread(3), getwc(3), putc(3), ungetc(3)

The fgetc(), getc(), and getchar() functions conform to ANSI X3.159-1989 (“ANSI C89”).

The getc() and getw() functions first appeared in Version 1 AT&T UNIX; getchar() in Version 2 AT&T UNIX; and fgetc() in Version 7 AT&T UNIX.

Dennis Ritchie originally implemented getc() and getw() in PDP-11 assembler.

Since EOF is a valid integer value, feof(3) and ferror(3) must be used to check for failure after calling getw().

Since the size and byte order of an int may vary from one machine to another, getw() is not recommended for portable applications.

December 1, 2017 OpenBSD-current