95 lines
2.1 KiB
C
95 lines
2.1 KiB
C
/*
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* Copyright (c) 1990 Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* and/or other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the University of California, Berkeley. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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/* No user fns here. Pesch 15apr92 */
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#include <_ansi.h>
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#include <stdio.h>
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#include <time.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <sys/types.h>
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/*
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* Return the (stdio) flags for a given mode. Store the flags
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* to be passed to an open() syscall through *optr.
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* Return 0 on error.
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*/
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int
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__sflags (struct _reent *ptr,
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register char *mode,
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int *optr)
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{
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register int ret, m, o;
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switch (mode[0])
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{
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case 'r': /* open for reading */
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ret = __SRD;
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m = O_RDONLY;
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o = 0;
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break;
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case 'w': /* open for writing */
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ret = __SWR;
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m = O_WRONLY;
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o = O_CREAT | O_TRUNC;
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break;
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case 'a': /* open for appending */
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ret = __SWR | __SAPP;
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m = O_WRONLY;
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o = O_CREAT | O_APPEND;
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break;
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default: /* illegal mode */
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ptr->_errno = EINVAL;
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return (0);
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}
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while (*++mode)
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{
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switch (*mode)
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{
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case '+':
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ret = (ret & ~(__SRD | __SWR)) | __SRW;
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m = (m & ~O_ACCMODE) | O_RDWR;
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break;
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case 'b':
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#ifdef O_BINARY
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m |= O_BINARY;
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#endif
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break;
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#ifdef __CYGWIN__
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case 't':
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m |= O_TEXT;
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break;
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#endif
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#if defined (O_CLOEXEC) && defined (_GLIBC_EXTENSION)
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case 'e':
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m |= O_CLOEXEC;
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break;
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#endif
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case 'x':
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m |= O_EXCL;
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break;
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default:
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break;
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}
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}
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*optr = m | o;
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return ret;
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}
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