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jfs_unicode.h

/*
 *   Copyright (c) International Business Machines Corp., 2000-2002
 *
 *   This program is free software;  you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program;  if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

/*
 * Notes:
 *     These APIs are based on the C library functions.  The semantics
 *     should match the C functions but with expanded size operands.
 *
 *     The upper/lower functions are based on a table created by mkupr.
 *     This is a compressed table of upper and lower case conversion.
 */

struct UNICASERANGE {
      UniChar start;
      UniChar end;
      signed char *table;
};

extern signed char UniUpperTable[512];
extern struct UNICASERANGE UniUpperRange[];

/*
 * UniStrcpy:  Copy a string
 */
static inline UniChar *UniStrcpy(UniChar * ucs1, const UniChar * ucs2)
{
      UniChar *anchor = ucs1; /* save the start of result string */

      while ((*ucs1++ = *ucs2++));
      return anchor;
}


/*
 * UniStrlen:  Return the length of a string
 */
static inline size_t UniStrlen(const UniChar * ucs1)
{
      int i = 0;

      while (*ucs1++)
            i++;
      return i;
}


/*
 * UniStrncmp:  Compare length limited string
 */
static inline int UniStrncmp(const UniChar * ucs1, const UniChar * ucs2,
                       size_t n)
{
      if (!n)
            return 0;   /* Null strings are equal */
      while ((*ucs1 == *ucs2) && *ucs1 && --n) {
            ucs1++;
            ucs2++;
      }
      return (int) *ucs1 - (int) *ucs2;
}


/*
 * UniStrncpy:  Copy length limited string with pad
 */
static inline UniChar *UniStrncpy(UniChar * ucs1, const UniChar * ucs2,
                          size_t n)
{
      UniChar *anchor = ucs1;

      while (n-- && *ucs2)    /* Copy the strings */
            *ucs1++ = *ucs2++;

      n++;
      while (n--)       /* Pad with nulls */
            *ucs1++ = 0;
      return anchor;
}


/*
 * UniToupper:  Convert a unicode character to upper case
 */
static inline UniChar UniToupper(UniChar uc)
{
      struct UNICASERANGE *rp;

      if (uc < sizeof(UniUpperTable)) {   /* Latin characters */
            return uc + UniUpperTable[uc];      /* Use base tables */
      } else {
            rp = UniUpperRange;     /* Use range tables */
            while (rp->start) {
                  if (uc < rp->start)     /* Before start of range */
                        return uc;  /* Uppercase = input */
                  if (uc <= rp->end)      /* In range */
                        return uc + rp->table[uc - rp->start];
                  rp++; /* Try next range */
            }
      }
      return uc;        /* Past last range */
}


/*
 * UniStrupr:  Upper case a unicode string
 */
static inline UniChar *UniStrupr(UniChar * upin)
{
      UniChar *up;

      up = upin;
      while (*up) {           /* For all characters */
            *up = UniToupper(*up);
            up++;
      }
      return upin;            /* Return input pointer */
}


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