NAME

getc, getchar, fgetc – get character or word from a stream

SYNOPSIS

#include <stdio.h>

int getc(FILE *stream);

int getchar(void);

int fgetc(FILE *stream);

DESCRIPTION

fgetc() returns the next character (that is, byte) from the named input stream as an unsigned char converted to an int. It also moves the file pointer ahead one character.

getc() behaves like fgetc(), but runs a bit slowly, because based on fgetc().

getchar() returns a character from stdin. It defines as macro getc(stdin).

RETURN VALUES

These functions return the character read. If the end-of-file indicator for the stream is set, or if the stream is at end-of-file functions return EOF. If a read error occurs, the error indicator for the stream will be set, functions will return EOF, and set errno to indicate the error.

ERRORS

This function is a member of Unison’s STDIO implementation. The STDIO implementation rests on top of IOLIB and inherits IOLIB’s dependency on each specific server to report an appropriate error code for its usage.

For an exact list of error codes returned by a particular server, refer to that server’s documentation in the Unison Programmer’s Guide for each specific platform.

Servers may implement these errors codes in response to this function.

[EAGAIN]

The O_NONBLOCK flag is set for the file descriptor underlying stream and the thread would be delayed in the fgetc() operation.

[EBADF]

The file descriptor underlying stream is not a valid file descriptor open for reading.

[EIO]

This error may be generated for implementation-defined reasons.

[ENOMEM]

Insufficient storage space is available.

[ENXIO]

A request was made of a nonexistent device, or the request was outside the capabilities of the device.

SEE ALSO

fclose(), ferror(), fopen(), fread(), gets(), putc(), scanf(), ungetc()

NOTES

If the integer value returned by getc(), getchar(), 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 implementation dependent.