Implementation status: partially implemented

Synopsis

#include <stdio.h>

int getc(FILE *stream);

Description

Gets the next character (an unsigned char) from the specified stream and advances the position indicator for the stream.

Arguments:

stream - the specified stream,

The function (if it is implemented as a macro) may evaluate stream more than once, so the argument should never be an expression with side-effects.

Return value

Upon successful completion, getc() returns the next byte from the input stream pointed to by stream. If the end-of-file indicator for the stream is set, or if the stream is at end-of-file, the end-of-file indicator for the stream is set and getc() returns EOF. If a read error occurs, the error indicator for the stream is set, getc() returns EOF, and sets errno to indicate the error.

Errors

[EAGAIN] The O_NONBLOCK flag is set for the file descriptor underlying stream and the thread would be delayed in the getc() operation.
[EBADF] The file descriptor underlying stream is not a valid file descriptor open for reading.
[EINTR] The read operation was terminated due to the receipt of a signal, and no data was transferred.
[EIO] A physical I/O error has occurred, or the process is in a background process group attempting to read from its controlling terminal, and either the calling thread is blocking SIGTTIN or the process is ignoring SIGTTIN or the process group of the process is orphaned.
[EOVERFLOW] The file is a regular file and an attempt was made to read at or beyond the offset maximum associated with the corresponding stream.
[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.

Implementation tasks

  • Implement error handling for the getc() function.