diff options
Diffstat (limited to 'libc/stdio/fread.c')
| -rw-r--r-- | libc/stdio/fread.c | 175 |
1 files changed, 0 insertions, 175 deletions
diff --git a/libc/stdio/fread.c b/libc/stdio/fread.c deleted file mode 100644 index 649db17..0000000 --- a/libc/stdio/fread.c +++ /dev/null @@ -1,175 +0,0 @@ -/* $OpenBSD: fread.c,v 1.6 2005/08/08 08:05:36 espie Exp $ */ -/*- - * Copyright (c) 1990, 1993 - * The Regents of the University of California. All rights reserved. - * - * This code is derived from software contributed to Berkeley by - * Chris Torek. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. Neither the name of the University nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - */ - -#include <stdio.h> -#include <string.h> -#include <errno.h> -#include "local.h" - -static int -lflush(FILE *fp) -{ - if ((fp->_flags & (__SLBF|__SWR)) == (__SLBF|__SWR)) - return (__sflush_locked(fp)); - return (0); -} - -size_t -fread(void *buf, size_t size, size_t count, FILE *fp) -{ - size_t resid; - char *p; - int r; - size_t total; - - /* - * The ANSI standard requires a return value of 0 for a count - * or a size of 0. Peculiarily, it imposes no such requirements - * on fwrite; it only requires fread to be broken. - */ - if ((resid = count * size) == 0) - return (0); - FLOCKFILE(fp); - if (fp->_r < 0) - fp->_r = 0; - total = resid; - p = buf; - -#if 1 /* BIONIC: optimize unbuffered reads */ - if (fp->_flags & __SNBF && fp->_ur == 0) - { - /* the following comes mainly from __srefill(), with slight - * modifications - */ - - /* make sure stdio is set up */ - if (!__sdidinit) - __sinit(); - - fp->_r = 0; /* largely a convenience for callers */ - - /* SysV does not make this test; take it out for compatibility */ - if (fp->_flags & __SEOF) { - FUNLOCKFILE(fp); - return (EOF); - } - - /* if not already reading, have to be reading and writing */ - if ((fp->_flags & __SRD) == 0) { - if ((fp->_flags & __SRW) == 0) { - fp->_flags |= __SERR; - FUNLOCKFILE(fp); - errno = EBADF; - return (EOF); - } - /* switch to reading */ - if (fp->_flags & __SWR) { - if (__sflush(fp)) { - FUNLOCKFILE(fp); - return (EOF); - } - fp->_flags &= ~__SWR; - fp->_w = 0; - fp->_lbfsize = 0; - } - fp->_flags |= __SRD; - } else { - /* - * We were reading. If there is an ungetc buffer, - * we must have been reading from that. Drop it, - * restoring the previous buffer (if any). If there - * is anything in that buffer, return. - */ - if (HASUB(fp)) { - FREEUB(fp); - } - } - - /* - * Before reading from a line buffered or unbuffered file, - * flush all line buffered output files, per the ANSI C - * standard. - */ - - if (fp->_flags & (__SLBF|__SNBF)) { - /* Ignore this file in _fwalk to deadlock. */ - fp->_flags |= __SIGN; - (void) _fwalk(lflush); - fp->_flags &= ~__SIGN; - - /* Now flush this file without locking it. */ - if ((fp->_flags & (__SLBF|__SWR)) == (__SLBF|__SWR)) - __sflush(fp); - } - - while (resid > 0) { - int len = (*fp->_read)(fp->_cookie, p, resid ); - fp->_flags &= ~__SMOD; - if (len <= 0) { - if (len == 0) - fp->_flags |= __SEOF; - else { - fp->_flags |= __SERR; - } - FUNLOCKFILE(fp); - return ((total - resid) / size); - } - p += len; - resid -= len; - } - FUNLOCKFILE(fp); - return (count); - } - else -#endif - { - while (resid > (size_t)(r = fp->_r)) { - (void)memcpy((void *)p, (void *)fp->_p, (size_t)r); - fp->_p += r; - /* fp->_r = 0 ... done in __srefill */ - p += r; - resid -= r; - if (__srefill(fp)) { - /* no more input: return partial result */ - FUNLOCKFILE(fp); - return ((total - resid) / size); - } - } - } - - (void)memcpy((void *)p, (void *)fp->_p, resid); - fp->_r -= resid; - fp->_p += resid; - FUNLOCKFILE(fp); - return (count); -} |