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60 lines
1.0 KiB
C
60 lines
1.0 KiB
C
/*
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* fgetc.c
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*
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* (C) Copyright 1998, 2002 Ullrich von Bassewitz (uz@cc65.org)
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*
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <errno.h>
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#include "_file.h"
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/*****************************************************************************/
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/* Code */
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/*****************************************************************************/
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int __fastcall__ fgetc (register FILE* f)
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{
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unsigned char c;
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/* Check if the file is open or if there is an error condition */
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if ((f->f_flags & _FOPEN) == 0 || (f->f_flags & (_FERROR | _FEOF)) != 0) {
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return EOF;
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}
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/* If we have a pushed back character, return it */
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if (f->f_flags & _FPUSHBACK) {
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f->f_flags &= ~_FPUSHBACK;
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return f->f_pushback;
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}
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/* Read one byte */
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switch (read (f->f_fd, &c, 1)) {
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case -1:
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/* Error */
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f->f_flags |= _FERROR;
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return EOF;
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case 0:
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/* EOF */
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f->f_flags |= _FEOF;
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return EOF;
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default:
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/* Char read */
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return c;
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}
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}
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