[unix-history] / usr / src / usr.bin / f77 / libU77 / access_.c

/*
* Copyright (c) 1980 Regents of the University of California.
* All rights reserved.  The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*
*      @(#)access_.c   5.1     %G%
*/

/*
* determine accessability of a file
*
* calling format:
*      integer access
*      ierror = access(filename, mode)
* where:
*      ierror will be 0 for successful access; an error number otherwise.
*      filename is a character string
*      mode is a character string which may include any combination of
*      'r', 'w', 'x', ' '. (' ' => test for existence)
*/

#include "../libI77/f_errno.h"
#include <sys/param.h>
#ifndef MAXPATHLEN
#define MAXPATHLEN      128
#endif

long access_(name, mode, namlen, modlen)
char *name, *mode;
long namlen, modlen;
{
       char buf[MAXPATHLEN];
       int m = 0;

       if (namlen >= sizeof buf)
               return((long)(errno=F_ERARG));
       g_char(name, namlen, buf);
       if (buf[0] == '\0')
               return((long)(errno=ENOENT));
       if (access(buf, 0) < 0)
               return((long)errno);
       while (modlen--) switch(*mode++)
       {
               case 'x':
                       m |= 1;
                       break;

               case 'w':
                       m |= 2;
                       break;

               case 'r':
                       m |= 4;
                       break;
       }
       if (m > 0 && access(buf, m) < 0)
               return((long)errno);
       return(0L);
}