Standard Libraries for EDK II.

[mirror_edk2.git] / StdLib / LibC / Stdio / refill.c

/*  $NetBSD: refill.c,v 1.13 2003/08/07 16:43:30 agc Exp $  */\r
\r
/*-\r
 * Copyright (c) 1990, 1993\r
 *  The Regents of the University of California.  All rights reserved.\r
 *\r
 * This code is derived from software contributed to Berkeley by\r
 * Chris Torek.\r
 *\r
 * Redistribution and use in source and binary forms, with or without\r
 * modification, are permitted provided that the following conditions\r
 * are met:\r
 * 1. Redistributions of source code must retain the above copyright\r
 *    notice, this list of conditions and the following disclaimer.\r
 * 2. Redistributions in binary form must reproduce the above copyright\r
 *    notice, this list of conditions and the following disclaimer in the\r
 *    documentation and/or other materials provided with the distribution.\r
 * 3. Neither the name of the University nor the names of its contributors\r
 *    may be used to endorse or promote products derived from this software\r
 *    without specific prior written permission.\r
 *\r
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND\r
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\r
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\r
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE\r
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL\r
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS\r
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)\r
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT\r
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY\r
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF\r
 * SUCH DAMAGE.\r
 */\r
#include <Uefi.h>               // REMOVE, For DEBUG only\r
#include <Library/UefiLib.h>    // REMOVE, For DEBUG only\r
\r
#include  <LibConfig.h>\r
#include <sys/EfiCdefs.h>\r
#if defined(LIBC_SCCS) && !defined(lint)\r
#if 0\r
static char sccsid[] = "@(#)refill.c  8.1 (Berkeley) 6/4/93";\r
#else\r
__RCSID("$NetBSD: refill.c,v 1.13 2003/08/07 16:43:30 agc Exp $");\r
#endif\r
#endif /* LIBC_SCCS and not lint */\r
\r
#include <assert.h>\r
#include <errno.h>\r
#include <stdio.h>\r
#include <stdlib.h>\r
#include "reentrant.h"\r
#include "local.h"\r
\r
#ifdef _REENTRANT\r
extern rwlock_t __sfp_lock;\r
#endif\r
\r
static int lflush(FILE *);\r
\r
static int\r
lflush(FILE *fp)\r
{\r
\r
  //_DIAGASSERT(fp != NULL);\r
\r
  if ((fp->_flags & (__SLBF|__SWR)) == (__SLBF|__SWR))\r
    return (__sflush(fp));\r
  return (0);\r
}\r
\r
/*\r
 * Refill a stdio buffer.\r
 * Return EOF on eof or error, 0 otherwise.\r
 */\r
int\r
__srefill(FILE *fp)\r
{\r
\r
  //_DIAGASSERT(fp != NULL);\r
\r
  /* make sure stdio is set up */\r
  if (!__sdidinit)\r
    __sinit();\r
\r
//Print(L"%a( %d)\n", __func__, fp->_file);\r
  fp->_r = 0;   /* largely a convenience for callers */\r
\r
  /* SysV does not make this test; take it out for compatibility */\r
  if (fp->_flags & __SEOF) {\r
//Print(L"%a: %d\n", __func__, __LINE__);\r
    return (EOF);\r
  }\r
\r
  /* if not already reading, have to be reading and writing */\r
  if ((fp->_flags & __SRD) == 0) {\r
//Print(L"%a: %d\n", __func__, __LINE__);\r
    if ((fp->_flags & __SRW) == 0) {\r
      errno = EBADF;\r
      fp->_flags |= __SERR;   //<dvm> Allows differentiation between errors and EOF\r
//Print(L"%a: %d\n", __func__, __LINE__);\r
      return (EOF);\r
    }\r
    /* switch to reading */\r
    if (fp->_flags & __SWR) {\r
      if (__sflush(fp)) {\r
//Print(L"%a: %d\n", __func__, __LINE__);\r
        return (EOF);\r
      }\r
      fp->_flags &= ~__SWR;\r
      fp->_w = 0;\r
      fp->_lbfsize = 0;\r
    }\r
    fp->_flags |= __SRD;\r
  } else {\r
//Print(L"%a: %d\n", __func__, __LINE__);\r
    /*\r
     * We were reading.  If there is an ungetc buffer,\r
     * we must have been reading from that.  Drop it,\r
     * restoring the previous buffer (if any).  If there\r
     * is anything in that buffer, return.\r
     */\r
    if (HASUB(fp)) {\r
      FREEUB(fp);\r
      if ((fp->_r = fp->_ur) != 0) {\r
        fp->_p = fp->_up;\r
//Print(L"%a: %d\n", __func__, __LINE__);\r
        return (0);\r
      }\r
    }\r
  }\r
\r
  if (fp->_bf._base == NULL)\r
    __smakebuf(fp);\r
\r
//Print(L"%a: %d\n", __func__, __LINE__);\r
  /*\r
   * Before reading from a line buffered or unbuffered file,\r
   * flush all line buffered output files, per the ANSI C\r
   * standard.\r
   */\r
  if (fp->_flags & (__SLBF|__SNBF)) {\r
    rwlock_rdlock(&__sfp_lock);\r
    (void) _fwalk(lflush);\r
    rwlock_unlock(&__sfp_lock);\r
//Print(L"%a: %d\n", __func__, __LINE__);\r
  }\r
  fp->_p = fp->_bf._base;\r
  fp->_r = (*fp->_read)(fp->_cookie, (char *)fp->_p, fp->_bf._size);\r
  fp->_flags &= ~__SMOD;  /* buffer contents are again pristine */\r
  if (fp->_r <= 0) {\r
    if (fp->_r == 0)\r
      fp->_flags |= __SEOF;\r
    else {\r
      fp->_r = 0;\r
      fp->_flags |= __SERR;\r
    }\r
//Print(L"%a: %d\n", __func__, __LINE__);\r
    return (EOF);\r
  }\r
//Print(L"%a: %d\n", __func__, __LINE__);\r
  return (0);\r
}\r