Libc-498.tar.gz

[apple/libc.git] / stdio / stdio-fbsd.c

diff --git a/stdio/stdio-fbsd.c b/stdio/stdio-fbsd.c
new file mode 100644 (file)
index 0000000..233427c
--- /dev/null
+++ b/stdio/stdio-fbsd.c
@@ -0,0 +1,191 @@
+/*-
+ * 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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *     This product includes software developed by the University of
+ *     California, Berkeley and its contributors.
+ * 4. 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.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)stdio.c    8.1 (Berkeley) 6/4/93";
+#endif /* LIBC_SCCS and not lint */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD: src/lib/libc/stdio/stdio.c,v 1.24 2003/01/07 06:17:13 tjr Exp $");
+
+#include "namespace.h"
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include "un-namespace.h"
+#include "local.h"
+
+/*
+ * Small standard I/O/seek/close functions.
+ */
+int
+__sread(cookie, buf, n)
+       void *cookie;
+       char *buf;
+       int n;
+{
+       FILE *fp = cookie;
+
+       return(_read(fp->_file, buf, (size_t)n));
+}
+
+int
+__swrite(cookie, buf, n)
+       void *cookie;
+       char const *buf;
+       int n;
+{
+       FILE *fp = cookie;
+
+       return (_write(fp->_file, buf, (size_t)n));
+}
+
+fpos_t
+__sseek(cookie, offset, whence)
+       void *cookie;
+       fpos_t offset;
+       int whence;
+{
+       FILE *fp = cookie;
+
+       return (lseek(fp->_file, (off_t)offset, whence));
+}
+
+int
+__sclose(cookie)
+       void *cookie;
+{
+
+       return (_close(((FILE *)cookie)->_file));
+}
+
+/*
+ * Higher level wrappers.
+ */
+int
+_sread(fp, buf, n)
+       FILE *fp;
+       char *buf;
+       int n;
+{
+       int ret;
+
+       ret = (*fp->_read)(fp->_cookie, buf, n);
+       if (ret > 0) {
+               if (fp->_flags & __SOFF) {
+                       if (fp->_offset <= OFF_MAX - ret)
+                               fp->_offset += ret;
+                       else
+                               fp->_flags &= ~__SOFF;
+               }
+       } else if (ret < 0)
+               fp->_flags &= ~__SOFF;
+       return (ret);
+}
+
+int
+_swrite(fp, buf, n)
+       FILE *fp;
+       char const *buf;
+       int n;
+{
+       int ret;
+       int serrno;
+
+       if (fp->_flags & __SAPP) {
+               serrno = errno;
+               if (_sseek(fp, (fpos_t)0, SEEK_END) == -1 &&
+                   (fp->_flags & __SOPT))
+                       return (-1);
+               errno = serrno;
+       }
+       ret = (*fp->_write)(fp->_cookie, buf, n);
+       /* __SOFF removed even on success in case O_APPEND mode is set. */
+       if (ret >= 0) {
+               if ((fp->_flags & (__SAPP|__SOFF)) == (__SAPP|__SOFF) &&
+                   fp->_offset <= OFF_MAX - ret)
+                       fp->_offset += ret;
+               else
+                       fp->_flags &= ~__SOFF;
+
+       } else if (ret < 0)
+               fp->_flags &= ~__SOFF;
+       return (ret);
+}
+
+fpos_t
+_sseek(fp, offset, whence)
+       FILE *fp;
+       fpos_t offset;
+       int whence;
+{
+       fpos_t ret;
+       int serrno, errret;
+
+       serrno = errno;
+       errno = 0;
+       ret = (*fp->_seek)(fp->_cookie, offset, whence);
+       errret = errno;
+       if (errno == 0)
+               errno = serrno;
+       /*
+        * Disallow negative seeks per POSIX.
+        * It is needed here to help upper level caller
+        * in the cases it can't detect.
+        */
+       if (ret < 0) {
+               if (errret == 0) {
+                       if (offset != 0 || whence != SEEK_CUR) {
+                               if (HASUB(fp))
+                                       FREEUB(fp);
+                               fp->_p = fp->_bf._base;
+                               fp->_r = 0;
+                               fp->_flags &= ~__SEOF;
+                       }
+                       fp->_flags |= __SERR;
+                       errno = EINVAL;
+               } else if (errret == ESPIPE)
+                       fp->_flags &= ~__SAPP;
+               fp->_flags &= ~__SOFF;
+               ret = -1;
+       } else if (fp->_flags & __SOPT) {
+               fp->_flags |= __SOFF;
+               fp->_offset = ret;
+       }
+       return (ret);
+}