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/*
* Copyright (c) 1990 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* and/or other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
/* No user fns here. Pesch 15apr92 */
#include "stdio_private.h"
/*
* Return the (stdio) flags for a given mode. Store the flags to be
* passed to open() through *optr.
*
* Return 0 on error.
*/
int
__stdio_flags(const char *mode, int *optr)
{
int ret;
int o;
switch (mode[0]) {
case 'r': /* open for reading */
ret = __SRD;
o = O_RDONLY;
break;
case 'w': /* open for writing */
ret = __SWR;
o = O_WRONLY | O_CREAT | O_TRUNC;
break;
case 'a': /* open for appending */
ret = __SWR;
o = O_WRONLY | O_CREAT | O_APPEND;
break;
default: /* illegal mode */
errno = EINVAL;
return (0);
}
while (*++mode) {
switch (*mode) {
case '+':
ret |= (__SRD | __SWR);
o = (o & ~O_ACCMODE) | O_RDWR;
break;
default:
break;
}
}
*optr = o;
return ret;
}
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