source: buchla-68k/orig/IOLIB/GETC.C

Last change on this file was 3ae31e9, checked in by Thomas Lopatic <thomas@…>, 7 years ago

Imported original source code.

  • Property mode set to 100755
File size: 880 bytes
Line 
1/*
2 ============================================================================
3 getc.c -- get a character from a stream file
4 Version 3 -- 1987-09-22 -- D.N. Lynx Crowe
5 ============================================================================
6*/
7
8#include "stdio.h"
9#include "stddefs.h"
10
11int
12getc(ptr)
13register FILE *ptr;
14{
15 register int len;
16
17 if (ptr->_bp >= ptr->_bend) { /* see if the buffer is empty */
18
19 if (ptr->_flags & _EOF) /* check EOF status */
20 return(EOF);
21
22 ptr->_flags &= ~_DIRTY; /* reset the dirty buffer bit */
23
24 if (ptr->_buff EQ NULL) /* get a buffer if none exists */
25 getbuff(ptr);
26
27 if ((len = read(ptr->_unit, ptr->_buff, ptr->_buflen)) LE 0) {
28
29 ptr->_flags |= ((len EQ 0) ? _EOF : _IOERR);
30 return(EOF);
31 }
32
33 ptr->_bend = (ptr->_bp = ptr->_buff) + len;
34 }
35
36 return(*ptr->_bp++ & 0xFF);
37}
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