usr/src/lib/libast/common/string/strtape.c

   1 /***********************************************************************
   2 *                                                                      *
   3 *               This software is part of the ast package               *
   4 *          Copyright (c) 1985-2010 AT&T Intellectual Property          *
   5 *                      and is licensed under the                       *
   6 *                  Common Public License, Version 1.0                  *
   7 *                    by AT&T Intellectual Property                     *
   8 *                                                                      *
   9 *                A copy of the License is available at                 *
  10 *            http://www.opensource.org/licenses/cpl1.0.txt             *
  11 *         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
  12 *                                                                      *
  13 *              Information and Software Systems Research               *
  14 *                            AT&T Research                             *
  15 *                           Florham Park NJ                            *
  16 *                                                                      *
  17 *                 Glenn Fowler <gsf@research.att.com>                  *
  18 *                  David Korn <dgk@research.att.com>                   *
  19 *                   Phong Vo <kpv@research.att.com>                    *
  20 *                                                                      *
  21 ***********************************************************************/
  22 #pragma prototyped
  23 /*
  24  * local device pathname for portable tape unit specification is returned
  25  * if e is non-null then it is set to the next unused char in s
  26  *
  27  *      <unit><density>[<no-rewind>]
  28  *      {0-7}[l,m,h,u,c][n]
  29  */
  30
  31 #include <ast.h>
  32
  33 char*
  34 strtape(register const char* s, register char** e)
  35 {
  36         int             mtunit = '0';
  37         int             mtdensity = 0;
  38         char            mtrewind[2];
  39         char            mtbehavior[2];
  40
  41         static char     tapefile[sizeof("/dev/Xrmt/123456789")];
  42
  43         mtrewind[0] = mtrewind[1] = mtbehavior[0] = mtbehavior[1] = 0;
  44         for (;;)
  45         {
  46                 switch (*s)
  47                 {
  48                 case '0':
  49                 case '1':
  50                 case '2':
  51                 case '3':
  52                 case '4':
  53                 case '5':
  54                 case '6':
  55                 case '7':
  56                         mtunit = *s++;
  57                         continue;
  58                 case 'b':
  59                 case 'v':
  60                         mtbehavior[0] = *s++;
  61                         continue;
  62                 case 'l':
  63                 case 'm':
  64                 case 'h':
  65                 case 'u':
  66                 case 'c':
  67                         mtdensity = *s++;
  68                         continue;
  69                 case 'n':
  70                         mtrewind[0] = *s++;
  71                         continue;
  72                 }
  73                 break;
  74         }
  75         if (e) *e = (char*)s;
  76         if (!access("/dev/rmt/.", F_OK))
  77         {
  78                 /*
  79                  * system V
  80                  */
  81
  82                 if (!mtdensity) mtdensity = 'm';
  83                 sfsprintf(tapefile, sizeof(tapefile), "/dev/rmt/ctape%c%s", mtunit, mtrewind);
  84                 if (!access(tapefile, F_OK)) return(tapefile);
  85                 for (;;)
  86                 {
  87                         sfsprintf(tapefile, sizeof(tapefile), "/dev/rmt/%c%c%s%s", mtunit, mtdensity, mtbehavior, mtrewind);
  88                         if (!access(tapefile, F_OK)) return(tapefile);
  89                         if (!mtbehavior[0]) break;
  90                         mtbehavior[0] = 0;
  91                 }
  92         }
  93         else if (!access("/dev/nst0", F_OK))
  94         {
  95                 /*
  96                  * linux
  97                  */
  98
  99                 sfsprintf(tapefile, sizeof(tapefile), "/dev/%sst%c", mtrewind, mtunit);
 100         }
 101         else if (!access("/dev/nrmt0", F_OK))
 102         {
 103                 /*
 104                  * 9th edition
 105                  */
 106
 107                 switch (mtdensity)
 108                 {
 109                 case 'l':
 110                         mtunit = '0';
 111                         break;
 112                 case 'm':
 113                         mtunit = '1';
 114                         break;
 115                 case 'h':
 116                         mtunit = '2';
 117                         break;
 118                 }
 119                 sfsprintf(tapefile, sizeof(tapefile), "/dev/%srmt%c", mtrewind, mtunit);
 120         }
 121         else
 122         {
 123                 /*
 124                  * BSD
 125                  */
 126
 127                 mtunit -= '0';
 128                 switch (mtdensity)
 129                 {
 130                 case 'l':
 131                         break;
 132                 case 'h':
 133                         mtunit |= 020;
 134                         break;
 135                 default:
 136                         mtunit |= 010;
 137                         break;
 138                 }
 139                 switch (mtrewind[0])
 140                 {
 141                 case 'n':
 142                         mtunit |= 040;
 143                         break;
 144                 }
 145                 sfsprintf(tapefile, sizeof(tapefile), "/dev/rmt%d", mtunit);
 146         }
 147         return(tapefile);
 148 }