OpenCores
URL https://opencores.org/ocsvn/or1k/or1k/trunk

Subversion Repositories or1k

[/] [or1k/] [trunk/] [newlib-1.10.0/] [newlib/] [libc/] [stdio/] [refill.c] - Blame information for rev 1773

Go to most recent revision | Details | Compare with Previous | View Log

Line No. Rev Author Line
1 1010 ivang 
/* No user fns here.  Pesch 15apr92. */
2 
 
3 
/*
4 
 * Copyright (c) 1990 The Regents of the University of California.
5 
 * All rights reserved.
6 
 *
7 
 * Redistribution and use in source and binary forms are permitted
8 
 * provided that the above copyright notice and this paragraph are
9 
 * duplicated in all such forms and that any documentation,
10 
 * advertising materials, and other materials related to such
11 
 * distribution and use acknowledge that the software was developed
12 
 * by the University of California, Berkeley.  The name of the
13 
 * University may not be used to endorse or promote products derived
14 
 * from this software without specific prior written permission.
15 
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
16 
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
17 
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
18 
 */
19 
 
20 
#include <stdio.h>
21 
#include "local.h"
22 
#include <stdlib.h>
23 
 
24 
static int
25 
lflush (fp)
26 
     FILE *fp;
27 
{
28 
  if ((fp->_flags & (__SLBF | __SWR)) == (__SLBF | __SWR))
29 
    return fflush (fp);
30 
  return 0;
31 
}
32 
 
33 
/*
34 
 * Refill a stdio buffer.
35 
 * Return EOF on eof or error, 0 otherwise.
36 
 */
37 
 
38 
int
39 
_DEFUN (__srefill, (fp),
40 
        register FILE * fp)
41 
{
42 
  /* make sure stdio is set up */
43 
 
44 
  CHECK_INIT (fp);
45 
 
46 
  fp->_r = 0;                    /* largely a convenience for callers */
47 
 
48 
  /* SysV does not make this test; take it out for compatibility */
49 
  if (fp->_flags & __SEOF)
50 
    return EOF;
51 
 
52 
  /* if not already reading, have to be reading and writing */
53 
  if ((fp->_flags & __SRD) == 0)
54 
    {
55 
      if ((fp->_flags & __SRW) == 0)
56 
        return EOF;
57 
      /* switch to reading */
58 
      if (fp->_flags & __SWR)
59 
        {
60 
          if (fflush (fp))
61 
            return EOF;
62 
          fp->_flags &= ~__SWR;
63 
          fp->_w = 0;
64 
          fp->_lbfsize = 0;
65 
        }
66 
      fp->_flags |= __SRD;
67 
    }
68 
  else
69 
    {
70 
      /*
71 
       * We were reading.  If there is an ungetc buffer,
72 
       * we must have been reading from that.  Drop it,
73 
       * restoring the previous buffer (if any).  If there
74 
       * is anything in that buffer, return.
75 
       */
76 
      if (HASUB (fp))
77 
        {
78 
          FREEUB (fp);
79 
          if ((fp->_r = fp->_ur) != 0)
80 
            {
81 
              fp->_p = fp->_up;
82 
              return 0;
83 
            }
84 
        }
85 
    }
86 
 
87 
  if (fp->_bf._base == NULL)
88 
    __smakebuf (fp);
89 
 
90 
  /*
91 
   * Before reading from a line buffered or unbuffered file,
92 
   * flush all line buffered output files, per the ANSI C
93 
   * standard.
94 
   */
95 
 
96 
  if (fp->_flags & (__SLBF | __SNBF))
97 
    (void) _fwalk (fp->_data, lflush);
98 
  fp->_p = fp->_bf._base;
99 
  fp->_r = (*fp->_read) (fp->_cookie, (char *) fp->_p, fp->_bf._size);
100 
  fp->_flags &= ~__SMOD;        /* buffer contents are again pristine */
101 
  if (fp->_r <= 0)
102 
    {
103 
      if (fp->_r == 0)
104 
        fp->_flags |= __SEOF;
105 
      else
106 
        {
107 
          fp->_r = 0;
108 
          fp->_flags |= __SERR;
109 
        }
110 
      return EOF;
111 
    }
112 
  return 0;
113 
}

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.