off-by-one error when translating names for associated files (from mycroft)

[unix-history] / usr / src / sys / isofs / cd9660 / cd9660_util.c

/*-
* Copyright (c) 1994
*      The Regents of the University of California.  All rights reserved.
*
* This code is derived from software contributed to Berkeley
* by Pace Willisson (pace@blitz.com).  The Rock Ridge Extension
* Support code is derived from software contributed to Berkeley
* by Atsushi Murai (amurai@spec.co.jp).
*
* %sccs.include.redist.c%
*
*      @(#)cd9660_util.c       8.2 (Berkeley) %G%
*/

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/resourcevar.h>
#include <sys/kernel.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/conf.h>
#include <sys/mount.h>
#include <sys/vnode.h>
#include <miscfs/specfs/specdev.h> /* XXX */
#include <miscfs/fifofs/fifo.h> /* XXX */
#include <sys/malloc.h>
#include <sys/dir.h>

#include <isofs/cd9660/iso.h>

#ifdef  __notanymore__
int
isonum_711 (p)
unsigned char *p;
{
       return (*p);
}

int
isonum_712 (p)
signed char *p;
{
       return (*p);
}

int
isonum_721 (p)
unsigned char *p;
{
       /* little endian short */
#if BYTE_ORDER != LITTLE_ENDIAN
       printf ("isonum_721 called on non little-endian machine!\n");
#endif

       return *(short *)p;
}

int
isonum_722 (p)
unsigned char *p;
{
       /* big endian short */
#if BYTE_ORDER != BIG_ENDIAN
       printf ("isonum_722 called on non big-endian machine!\n");
#endif

       return *(short *)p;
}

int
isonum_723 (p)
unsigned char *p;
{
#if BYTE_ORDER == BIG_ENDIAN
       return isonum_722 (p + 2);
#elif BYTE_ORDER == LITTLE_ENDIAN
       return isonum_721 (p);
#else
       printf ("isonum_723 unsupported byte order!\n");
       return 0;
#endif
}

int
isonum_731 (p)
unsigned char *p;
{
       /* little endian long */
#if BYTE_ORDER != LITTLE_ENDIAN
       printf ("isonum_731 called on non little-endian machine!\n");
#endif

       return *(long *)p;
}

int
isonum_732 (p)
unsigned char *p;
{
       /* big endian long */
#if BYTE_ORDER != BIG_ENDIAN
       printf ("isonum_732 called on non big-endian machine!\n");
#endif

       return *(long *)p;
}

int
isonum_733 (p)
unsigned char *p;
{
#if BYTE_ORDER == BIG_ENDIAN
       return isonum_732 (p + 4);
#elif BYTE_ORDER == LITTLE_ENDIAN
       return isonum_731 (p);
#else
       printf ("isonum_733 unsupported byte order!\n");
       return 0;
#endif
}
#endif  /* __notanymore__ */

/*
* translate and compare a filename
* Note: Version number plus ';' may be omitted.
*/
int
isofncmp(unsigned char *fn,int fnlen,unsigned char *isofn,int isolen)
{
       int i, j;
       char c;
       
       while (--fnlen >= 0) {
               if (--isolen < 0)
                       return *fn;
               if ((c = *isofn++) == ';') {
                       switch (*fn++) {
                       default:
                               return *--fn;
                       case 0:
                               return 0;
                       case ';':
                               break;
                       }
                       for (i = 0; --fnlen >= 0; i = i * 10 + *fn++ - '0') {
                               if (*fn < '0' || *fn > '9') {
                                       return -1;
                               }
                       }
                       for (j = 0; --isolen >= 0; j = j * 10 + *isofn++ - '0');
                       return i - j;
               }
               if (c != *fn) {
                       if (c >= 'A' && c <= 'Z') {
                               if (c + ('a' - 'A') != *fn) {
                                       if (*fn >= 'a' && *fn <= 'z')
                                               return *fn - ('a' - 'A') - c;
                                       else
                                               return *fn - c;
                               }
                       } else
                               return *fn - c;
               }
               fn++;
       }
       if (isolen > 0) {
               switch (*isofn) {
               default:
                       return -1;
               case '.':
                       if (isofn[1] != ';')
                               return -1;
               case ';':
                       return 0;
               }
       }
       return 0;
}

/*
* translate a filename
*/
void
isofntrans(unsigned char *infn,int infnlen,
          unsigned char *outfn,unsigned short *outfnlen,
          int original,int assoc)
{
       int fnidx = 0;
       
       if (assoc) {
               *outfn++ = ASSOCCHAR;
               fnidx++;
               infnlen++;
       }
       for (; fnidx < infnlen; fnidx++) {
               char c = *infn++;
               
               if (!original && c >= 'A' && c <= 'Z')
                       *outfn++ = c + ('a' - 'A');
               else if (!original && c == '.' && *infn == ';')
                       break;
               else if (!original && c == ';')
                       break;
               else
                       *outfn++ = c;
       }
       *outfnlen = fnidx;
}