usr/src/contrib/rc-1.4/open.c

/* open.c: to insulate <fcntl.h> from the rest of rc. */

#include <fcntl.h>
#include "rc.h"

/* prototype for open() follows. comment out if necessary */

/*extern int open(const char *, int,...);*/

/*
   Opens a file with the necessary flags. Assumes the following
   declaration for redirtype:

        enum redirtype {
                rFrom, rCreate, rAppend, rHeredoc, rHerestring
        };
*/

static const int mode_masks[] = {
        /* rFrom */     O_RDONLY,
        /* rCreate */   O_TRUNC | O_CREAT | O_WRONLY,
        /* rAppend */   O_APPEND | O_CREAT | O_WRONLY
};

extern int rc_open(const char *name, redirtype m) {
        if ((unsigned) m >= arraysize(mode_masks))
                panic("bad mode passed to rc_open");
        return open(name, mode_masks[m], 0666);
}