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cc65/libsrc/common/fgetc.c
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2000-05-28 13:40:48 +00:00

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655 B
C

/*
* Ullrich von Bassewitz, 11.08.1998
*
* int fgetc (FILE* f);
*/
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include "_file.h"
int fgetc (FILE* f)
{
char c;
/* Check if the file is open or if there is an error condition */
if ((f->f_flags & _FOPEN) == 0 || (f->f_flags & (_FERROR | _FEOF)) != 0) {
return -1;
}
/* Read the byte */
switch (read (f->f_fd, &c, 1)) {
case -1:
/* Error */
f->f_flags |= _FERROR;
return -1;
case 0:
/* EOF */
f->f_flags |= _FEOF;
return -1;
default:
/* Char read */
return ((int) c) & 0xFF;
}
}