Implementation status: partially implemented
int fgetc(FILE *stream);
The function gets the next character (an unsigned char) from the specified stream and advances the position indicator for the stream.
stream - the input stream.
If the end-of-file indicator for the input stream pointed to by stream is not set and a next byte is present, the
fgetc() function obtains the next byte as an
unsigned char converted to an
int, from the input stream pointed to by stream, and advances the associated file position indicator for the stream (if defined). Since
fgetc() operates on bytes, reading a character consisting of multiple bytes (or "a multi-byte character") requires multiple calls to
Upon successful completion,
fgetc() 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
EOF. If a read error occurs, the error indicator for the stream is set,
EOF, and sets
errno to indicate the error.
O_NONBLOCK flag is set for the file descriptor underlying stream and the thread would be delayed in the
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.
- Implement error handling for the function.