101 lines
2.4 KiB
C
101 lines
2.4 KiB
C
/* $Source$
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* $State$
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* $Revision$
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*/
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/*
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* Derived from dos-open.c for newlib-ia16 which was written for the
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* gcc-ia16 toolchain.
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*
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* Copyright (c) 2018 Bart Oldeman
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* Copyright (c) 2019--2021 TK Chia
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*
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* The authors hereby grant permission to use, copy, modify, distribute,
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* and license this software and its documentation for any purpose, provided
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* that existing copyright notices are retained in all copies and that this
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* notice is included verbatim in any distributions. No written agreement,
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* license, or royalty fee is required for any of the authorized uses.
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* Modifications to this software may be copyrighted by their authors
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* and need not follow the licensing terms described here, provided that
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* the new terms are clearly indicated on the first page of each file where
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* they apply.
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*/
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#include <errno.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <unistd.h>
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#include "libsys.h"
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int open(const char* pathname, int flags, ...)
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{
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int fd = -1, binmode;
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off_t ret;
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if ((flags & ~(O_ACCMODE | O_CREAT | O_TRUNC | O_APPEND
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| O_TEXT | O_BINARY)))
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{
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/* bail out if there are unknown flags */
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errno = EINVAL;
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return -1;
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}
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binmode = flags & (O_TEXT | O_BINARY);
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if (binmode != O_TEXT && binmode != O_BINARY && binmode != 0)
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{
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/* bail out if both O_TEXT and O_BINARY are specified (!) */
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errno = EINVAL;
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return -1;
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}
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if ((flags & O_CREAT))
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{
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/* special but common case O_WRONLY | O_CREAT | O_TRUNC
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* should be handled by only calling _sys_rawcreat */
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int fileexists = 0;
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if (!(flags & O_TRUNC))
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fileexists = _sys_exists(pathname);
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if (!fileexists)
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{
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va_list ap;
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mode_t mode;
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va_start(ap, flags);
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mode = va_arg(ap, mode_t);
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va_end(ap);
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fd = _sys_rawcreat(pathname, mode & 0200 ? 0 : 1);
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if (fd != -1)
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{
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if ((flags & O_ACCMODE) == O_WRONLY)
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return fd;
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close(fd);
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fd = -1;
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}
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}
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}
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/* try to open file with mode */
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if (fd == -1)
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fd = _sys_rawopen(pathname, flags & O_ACCMODE);
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if (fd == -1)
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return fd;
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ret = 0;
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/* handle O_TRUNC and O_APPEND */
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if ((flags & O_TRUNC))
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ret = _sys_rawwrite(fd, NULL, 0);
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else if ((flags & O_APPEND))
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ret = _sys_rawlseek(fd, 0L, SEEK_END);
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if (ret == -1)
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{
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close(fd);
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return -1;
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}
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/* handle O_TEXT and O_BINARY, and reset "end of file encountered" */
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_sys_setmode(fd, binmode == O_BINARY ? O_BINARY : O_TEXT);
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_sys_seteof(fd, 0);
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return fd;
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}
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