Annotation of prex/usr/lib/libc/stdio/flags.c, Revision 1.1
1.1 ! nbrk 1: /*-
! 2: * Copyright (c) 1990, 1993
! 3: * The Regents of the University of California. All rights reserved.
! 4: *
! 5: * This code is derived from software contributed to Berkeley by
! 6: * Chris Torek.
! 7: *
! 8: * Redistribution and use in source and binary forms, with or without
! 9: * modification, are permitted provided that the following conditions
! 10: * are met:
! 11: * 1. Redistributions of source code must retain the above copyright
! 12: * notice, this list of conditions and the following disclaimer.
! 13: * 2. Redistributions in binary form must reproduce the above copyright
! 14: * notice, this list of conditions and the following disclaimer in the
! 15: * documentation and/or other materials provided with the distribution.
! 16: * 3. Neither the name of the University nor the names of its contributors
! 17: * may be used to endorse or promote products derived from this software
! 18: * without specific prior written permission.
! 19: *
! 20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 30: * SUCH DAMAGE.
! 31: */
! 32:
! 33: #include <sys/types.h>
! 34: #include <sys/fcntl.h>
! 35: #include <stdio.h>
! 36: #include <errno.h>
! 37:
! 38: /*
! 39: * Return the (stdio) flags for a given mode. Store the flags
! 40: * to be passed to an open() syscall through *optr.
! 41: * Return 0 on error.
! 42: */
! 43: int
! 44: __sflags(char *mode, int *optr)
! 45: {
! 46: int ret, m, o;
! 47:
! 48: switch (*mode++) {
! 49:
! 50: case 'r': /* open for reading */
! 51: ret = __SRD;
! 52: m = O_RDONLY;
! 53: o = 0;
! 54: break;
! 55:
! 56: case 'w': /* open for writing */
! 57: ret = __SWR;
! 58: m = O_WRONLY;
! 59: o = O_CREAT | O_TRUNC;
! 60: break;
! 61:
! 62: case 'a': /* open for appending */
! 63: ret = __SWR;
! 64: m = O_WRONLY;
! 65: o = O_CREAT | O_APPEND;
! 66: break;
! 67:
! 68: default: /* illegal mode */
! 69: errno = EINVAL;
! 70: return (0);
! 71: }
! 72:
! 73: /* [rwa]\+ or [rwa]b\+ means read and write */
! 74: if (*mode == '+' || (*mode == 'b' && mode[1] == '+')) {
! 75: ret = __SRW;
! 76: m = O_RDWR;
! 77: }
! 78: *optr = m | o;
! 79: return (ret);
! 80: }
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