146079Sbostic /*-
2*61180Sbostic * Copyright (c) 1990, 1993
3*61180Sbostic * The Regents of the University of California. All rights reserved.
446079Sbostic *
546079Sbostic * This code is derived from software contributed to Berkeley by
646079Sbostic * Chris Torek.
746079Sbostic *
846079Sbostic * %sccs.include.redist.c%
921404Sdist */
1021404Sdist
1126647Sdonn #if defined(LIBC_SCCS) && !defined(lint)
12*61180Sbostic static char sccsid[] = "@(#)fopen.c 8.1 (Berkeley) 06/04/93";
1346079Sbostic #endif /* LIBC_SCCS and not lint */
1421404Sdist
1517951Sserge #include <sys/types.h>
1646079Sbostic #include <sys/stat.h>
1746278Storek #include <fcntl.h>
1817951Sserge #include <stdio.h>
1946079Sbostic #include <errno.h>
2046079Sbostic #include "local.h"
212004Swnj
222004Swnj FILE *
fopen(file,mode)232004Swnj fopen(file, mode)
2446271Storek const char *file;
2546271Storek const char *mode;
262004Swnj {
2746079Sbostic register FILE *fp;
2846079Sbostic register int f;
2946079Sbostic int flags, oflags;
302004Swnj
3146079Sbostic if ((flags = __sflags(mode, &oflags)) == 0)
3217951Sserge return (NULL);
3346079Sbostic if ((fp = __sfp()) == NULL)
3417951Sserge return (NULL);
3546079Sbostic if ((f = open(file, oflags, DEFFILEMODE)) < 0) {
3646079Sbostic fp->_flags = 0; /* release */
3746079Sbostic return (NULL);
3817951Sserge }
3946079Sbostic fp->_file = f;
4046079Sbostic fp->_flags = flags;
4146079Sbostic fp->_cookie = fp;
4246079Sbostic fp->_read = __sread;
4346079Sbostic fp->_write = __swrite;
4446079Sbostic fp->_seek = __sseek;
4546079Sbostic fp->_close = __sclose;
4646278Storek
4746278Storek /*
4846278Storek * When opening in append mode, even though we use O_APPEND,
4946278Storek * we need to seek to the end so that ftell() gets the right
5046278Storek * answer. If the user then alters the seek pointer, or
5146278Storek * the file extends, this will fail, but there is not much
5246278Storek * we can do about this. (We could set __SAPP and check in
5346278Storek * fseek and ftell.)
5446278Storek */
5546278Storek if (oflags & O_APPEND)
5646278Storek (void) __sseek((void *)fp, (fpos_t)0, SEEK_END);
5746079Sbostic return (fp);
582004Swnj }
59