BSD 4_3 release

[unix-history] / usr / src / lib / libc / stdio / freopen.c

diff --git a/usr/src/lib/libc/stdio/freopen.c b/usr/src/lib/libc/stdio/freopen.c
index 760c9d0..e81db9b 100644 (file)
--- a/usr/src/lib/libc/stdio/freopen.c
+++ b/usr/src/lib/libc/stdio/freopen.c
@@ -1,48 +1,59 @@
-/* @(#)freopen.c       4.2 (Berkeley) 3/9/81 */
-#include       <stdio.h>
-#include       <errno.h>
+/*
+ * Copyright (c) 1980 Regents of the University of California.
+ * All rights reserved.  The Berkeley software License Agreement
+ * specifies the terms and conditions for redistribution.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)freopen.c  5.2 (Berkeley) 3/9/86";
+#endif LIBC_SCCS and not lint
+
+#include <sys/types.h>
+#include <sys/file.h>
+#include <stdio.h>

 
 FILE *
 freopen(file, mode, iop)
 
 FILE *
 freopen(file, mode, iop)

-char *file;
-register char *mode;
-register FILE *iop;
+       char *file;
+       register char *mode;
+       register FILE *iop;

 {
 {

-       extern int errno;
-       register f, rw;
+       register f, rw, oflags;

 
 

-       rw = mode[1] == '+';
+       rw = (mode[1] == '+');

 
        fclose(iop);
 
        fclose(iop);

-       if (*mode=='w') {
-               f = creat(file, 0666);
-               if (rw && f>=0) {
-                       close(f);
-                       f = open(file, 2);
-               }
-       } else if (*mode=='a') {
-               if ((f = open(file, rw? 2: 1)) < 0) {
-                       if (errno == ENOENT) {
-                               f = creat(file, 0666);
-                               if (rw && f>=0) {
-                                       close(f);
-                                       f = open(file, 2);
-                               }
-                       }
-               }
-               if (f >= 0)
-                       lseek(f, 0L, 2);
-       } else
-               f = open(file, rw? 2: 0);
+
+       switch (*mode) {
+       case 'a':
+               oflags = O_CREAT | (rw ? O_RDWR : O_WRONLY);
+               break;
+       case 'r':
+               oflags = rw ? O_RDWR : O_RDONLY;
+               break;
+       case 'w':
+               oflags = O_TRUNC | O_CREAT | (rw ? O_RDWR : O_WRONLY);
+               break;
+       default:
+               return (NULL);
+       }
+
+       f = open(file, oflags, 0666);

        if (f < 0)
        if (f < 0)

-               return(NULL);
+               return (NULL);
+
+       if (*mode == 'a')
+               lseek(f, (off_t)0, L_XTND);
+

        iop->_cnt = 0;
        iop->_file = f;
        iop->_cnt = 0;
        iop->_file = f;

+       iop->_bufsiz = 0;

        if (rw)
        if (rw)

-               iop->_flag |= _IORW;
-       else if (*mode != 'r')
-               iop->_flag |= _IOWRT;
+               iop->_flag = _IORW;
+       else if (*mode == 'r')
+               iop->_flag = _IOREAD;

        else
        else

-               iop->_flag |= _IOREAD;
-       return(iop);
+               iop->_flag = _IOWRT;
+       iop->_base = iop->_ptr = NULL;
+       return (iop);

 }
 }