external/bsd/openldap/dist/libraries/liblunicode/ucstr.c

   1 /* $OpenLDAP: pkg/ldap/libraries/liblunicode/ucstr.c,v 1.37.2.4 2008/04/14 19:12:11 quanah Exp $ */
   2 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   3  *
   4  * Copyright 1998-2008 The OpenLDAP Foundation.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted only as authorized by the OpenLDAP
   9  * Public License.
  10  *
  11  * A copy of this license is available in file LICENSE in the
  12  * top-level directory of the distribution or, alternatively, at
  13  * <http://www.OpenLDAP.org/license.html>.
  14  */
  15
  16 #include "portable.h"
  17
  18 #include <ac/bytes.h>
  19 #include <ac/ctype.h>
  20 #include <ac/string.h>
  21 #include <ac/stdlib.h>
  22
  23 #include <lber_pvt.h>
  24
  25 #include <ldap_utf8.h>
  26 #include <ldap_pvt_uc.h>
  27
  28 #define malloc(x)       ber_memalloc_x(x,ctx)
  29 #define realloc(x,y)    ber_memrealloc_x(x,y,ctx)
  30 #define free(x)         ber_memfree_x(x,ctx)
  31
  32 int ucstrncmp(
  33         const ldap_unicode_t *u1,
  34         const ldap_unicode_t *u2,
  35         ber_len_t n )
  36 {
  37         for(; 0 < n; ++u1, ++u2, --n ) {
  38                 if( *u1 != *u2 ) {
  39                         return *u1 < *u2 ? -1 : +1;
  40                 }
  41                 if ( *u1 == 0 ) {
  42                         return 0;
  43                 }
  44         }
  45         return 0;
  46 }
  47
  48 int ucstrncasecmp(
  49         const ldap_unicode_t *u1,
  50         const ldap_unicode_t *u2,
  51         ber_len_t n )
  52 {
  53         for(; 0 < n; ++u1, ++u2, --n ) {
  54                 ldap_unicode_t uu1 = uctolower( *u1 );
  55                 ldap_unicode_t uu2 = uctolower( *u2 );
  56
  57                 if( uu1 != uu2 ) {
  58                         return uu1 < uu2 ? -1 : +1;
  59                 }
  60                 if ( uu1 == 0 ) {
  61                         return 0;
  62                 }
  63         }
  64         return 0;
  65 }
  66
  67 ldap_unicode_t * ucstrnchr(
  68         const ldap_unicode_t *u,
  69         ber_len_t n,
  70         ldap_unicode_t c )
  71 {
  72         for(; 0 < n; ++u, --n ) {
  73                 if( *u == c ) {
  74                         return (ldap_unicode_t *) u;
  75                 }
  76         }
  77
  78         return NULL;
  79 }
  80
  81 ldap_unicode_t * ucstrncasechr(
  82         const ldap_unicode_t *u,
  83         ber_len_t n,
  84         ldap_unicode_t c )
  85 {
  86         c = uctolower( c );
  87         for(; 0 < n; ++u, --n ) {
  88                 if( uctolower( *u ) == c ) {
  89                         return (ldap_unicode_t *) u;
  90                 }
  91         }
  92
  93         return NULL;
  94 }
  95
  96 void ucstr2upper(
  97         ldap_unicode_t *u,
  98         ber_len_t n )
  99 {
 100         for(; 0 < n; ++u, --n ) {
 101                 *u = uctoupper( *u );
 102         }
 103 }
 104
 105 struct berval * UTF8bvnormalize(
 106         struct berval *bv,
 107         struct berval *newbv,
 108         unsigned flags,
 109         void *ctx )
 110 {
 111         int i, j, len, clen, outpos, ucsoutlen, outsize, last;
 112         char *out, *outtmp, *s;
 113         ac_uint4 *ucs, *p, *ucsout;
 114
 115         static unsigned char mask[] = {
 116                 0, 0x7f, 0x1f, 0x0f, 0x07, 0x03, 0x01 };
 117
 118         unsigned casefold = flags & LDAP_UTF8_CASEFOLD;
 119         unsigned approx = flags & LDAP_UTF8_APPROX;
 120
 121         if ( bv == NULL ) {
 122                 return NULL;
 123         }
 124
 125         s = bv->bv_val;
 126         len = bv->bv_len;
 127
 128         if ( len == 0 ) {
 129                 return ber_dupbv_x( newbv, bv, ctx );
 130         }
 131
 132         if ( !newbv ) {
 133                 newbv = ber_memalloc_x( sizeof(struct berval), ctx );
 134                 if ( !newbv ) return NULL;
 135         }
 136
 137         /* Should first check to see if string is already in proper
 138          * normalized form. This is almost as time consuming as
 139          * the normalization though.
 140          */
 141
 142         /* finish off everything up to character before first non-ascii */
 143         if ( LDAP_UTF8_ISASCII( s ) ) {
 144                 if ( casefold ) {
 145                         outsize = len + 7;
 146                         out = (char *) ber_memalloc_x( outsize, ctx );
 147                         if ( out == NULL ) {
 148                                 return NULL;
 149                         }
 150                         outpos = 0;
 151
 152                         for ( i = 1; (i < len) && LDAP_UTF8_ISASCII(s + i); i++ ) {
 153                                 out[outpos++] = TOLOWER( s[i-1] );
 154                         }
 155                         if ( i == len ) {
 156                                 out[outpos++] = TOLOWER( s[len-1] );
 157                                 out[outpos] = '\0';
 158                                 newbv->bv_val = out;
 159                                 newbv->bv_len = outpos;
 160                                 return newbv;
 161                         }
 162                 } else {
 163                         for ( i = 1; (i < len) && LDAP_UTF8_ISASCII(s + i); i++ ) {
 164                                 /* empty */
 165                         }
 166
 167                         if ( i == len ) {
 168                                 return ber_str2bv_x( s, len, 1, newbv, ctx );
 169                         }
 170
 171                         outsize = len + 7;
 172                         out = (char *) ber_memalloc_x( outsize, ctx );
 173                         if ( out == NULL ) {
 174                                 return NULL;
 175                         }
 176                         outpos = i - 1;
 177                         memcpy(out, s, outpos);
 178                 }
 179         } else {
 180                 outsize = len + 7;
 181                 out = (char *) ber_memalloc_x( outsize, ctx );
 182                 if ( out == NULL ) {
 183                         return NULL;
 184                 }
 185                 outpos = 0;
 186                 i = 0;
 187         }
 188
 189         p = ucs = ber_memalloc_x( len * sizeof(*ucs), ctx );
 190         if ( ucs == NULL ) {
 191                 ber_memfree_x(out, ctx);
 192                 return NULL;
 193         }
 194
 195         /* convert character before first non-ascii to ucs-4 */
 196         if ( i > 0 ) {
 197                 *p = casefold ? TOLOWER( s[i-1] ) : s[i-1];
 198                 p++;
 199         }
 200
 201         /* s[i] is now first non-ascii character */
 202         for (;;) {
 203                 /* s[i] is non-ascii */
 204                 /* convert everything up to next ascii to ucs-4 */
 205                 while ( i < len ) {
 206                         clen = LDAP_UTF8_CHARLEN2( s + i, clen );
 207                         if ( clen == 0 ) {
 208                                 ber_memfree_x( ucs, ctx );
 209                                 ber_memfree_x( out, ctx );
 210                                 return NULL;
 211                         }
 212                         if ( clen == 1 ) {
 213                                 /* ascii */
 214                                 break;
 215                         }
 216                         *p = s[i] & mask[clen];
 217                         i++;
 218                         for( j = 1; j < clen; j++ ) {
 219                                 if ( (s[i] & 0xc0) != 0x80 ) {
 220                                         ber_memfree_x( ucs, ctx );
 221                                         ber_memfree_x( out, ctx );
 222                                         return NULL;
 223                                 }
 224                                 *p <<= 6;
 225                                 *p |= s[i] & 0x3f;
 226                                 i++;
 227                         }
 228                         if ( casefold ) {
 229                                 *p = uctolower( *p );
 230                         }
 231                         p++;
 232                 }
 233                 /* normalize ucs of length p - ucs */
 234                 uccompatdecomp( ucs, p - ucs, &ucsout, &ucsoutlen, ctx );
 235                 if ( approx ) {
 236                         for ( j = 0; j < ucsoutlen; j++ ) {
 237                                 if ( ucsout[j] < 0x80 ) {
 238                                         out[outpos++] = ucsout[j];
 239                                 }
 240                         }
 241                 } else {
 242                         ucsoutlen = uccanoncomp( ucsout, ucsoutlen );
 243                         /* convert ucs to utf-8 and store in out */
 244                         for ( j = 0; j < ucsoutlen; j++ ) {
 245                                 /* allocate more space if not enough room for
 246                                    6 bytes and terminator */
 247                                 if ( outsize - outpos < 7 ) {
 248                                         outsize = ucsoutlen - j + outpos + 6;
 249                                         outtmp = (char *) ber_memrealloc_x( out, outsize, ctx );
 250                                         if ( outtmp == NULL ) {
 251                                                 ber_memfree_x( ucsout, ctx );
 252                                                 ber_memfree_x( ucs, ctx );
 253                                                 ber_memfree_x( out, ctx );
 254                                                 return NULL;
 255                                         }
 256                                         out = outtmp;
 257                                 }
 258                                 outpos += ldap_x_ucs4_to_utf8( ucsout[j], &out[outpos] );
 259                         }
 260                 }
 261
 262                 ber_memfree_x( ucsout, ctx );
 263                 ucsout = NULL;
 264
 265                 if ( i == len ) {
 266                         break;
 267                 }
 268
 269                 last = i;
 270
 271                 /* Allocate more space in out if necessary */
 272                 if (len - i >= outsize - outpos) {
 273                         outsize += 1 + ((len - i) - (outsize - outpos));
 274                         outtmp = (char *) ber_memrealloc_x(out, outsize, ctx);
 275                         if (outtmp == NULL) {
 276                                 ber_memfree_x( ucs, ctx );
 277                                 ber_memfree_x( out, ctx );
 278                                 return NULL;
 279                         }
 280                         out = outtmp;
 281                 }
 282
 283                 /* s[i] is ascii */
 284                 /* finish off everything up to char before next non-ascii */
 285                 for ( i++; (i < len) && LDAP_UTF8_ISASCII(s + i); i++ ) {
 286                         out[outpos++] = casefold ? TOLOWER( s[i-1] ) : s[i-1];
 287                 }
 288                 if ( i == len ) {
 289                         out[outpos++] = casefold ? TOLOWER( s[len-1] ) : s[len-1];
 290                         break;
 291                 }
 292
 293                 /* convert character before next non-ascii to ucs-4 */
 294                 *ucs = casefold ? TOLOWER( s[i-1] ) : s[i-1];
 295                 p = ucs + 1;
 296         }
 297
 298         ber_memfree_x( ucs, ctx );
 299         out[outpos] = '\0';
 300         newbv->bv_val = out;
 301         newbv->bv_len = outpos;
 302         return newbv;
 303 }
 304
 305 /* compare UTF8-strings, optionally ignore casing */
 306 /* slow, should be optimized */
 307 int UTF8bvnormcmp(
 308         struct berval *bv1,
 309         struct berval *bv2,
 310         unsigned flags,
 311         void *ctx )
 312 {
 313         int i, l1, l2, len, ulen, res = 0;
 314         char *s1, *s2, *done;
 315         ac_uint4 *ucs, *ucsout1, *ucsout2;
 316
 317         unsigned casefold = flags & LDAP_UTF8_CASEFOLD;
 318         unsigned norm1 = flags & LDAP_UTF8_ARG1NFC;
 319         unsigned norm2 = flags & LDAP_UTF8_ARG2NFC;
 320
 321         if (bv1 == NULL) {
 322                 return bv2 == NULL ? 0 : -1;
 323
 324         } else if (bv2 == NULL) {
 325                 return 1;
 326         }
 327
 328         l1 = bv1->bv_len;
 329         l2 = bv2->bv_len;
 330
 331         len = (l1 < l2) ? l1 : l2;
 332         if (len == 0) {
 333                 return l1 == 0 ? (l2 == 0 ? 0 : -1) : 1;
 334         }
 335
 336         s1 = bv1->bv_val;
 337         s2 = bv2->bv_val;
 338         done = s1 + len;
 339
 340         while ( (s1 < done) && LDAP_UTF8_ISASCII(s1) && LDAP_UTF8_ISASCII(s2) ) {
 341                 if (casefold) {
 342                         char c1 = TOLOWER(*s1);
 343                         char c2 = TOLOWER(*s2);
 344                         res = c1 - c2;
 345                 } else {
 346                         res = *s1 - *s2;
 347                 }
 348                 s1++;
 349                 s2++;
 350                 if (res) {
 351                         /* done unless next character in s1 or s2 is non-ascii */
 352                         if (s1 < done) {
 353                                 if (!LDAP_UTF8_ISASCII(s1) || !LDAP_UTF8_ISASCII(s2)) {
 354                                         break;
 355                                 }
 356                         } else if (((len < l1) && !LDAP_UTF8_ISASCII(s1)) ||
 357                                 ((len < l2) && !LDAP_UTF8_ISASCII(s2)))
 358                         {
 359                                 break;
 360                         }
 361                         return res;
 362                 }
 363         }
 364
 365         /* We have encountered non-ascii or strings equal up to len */
 366
 367         /* set i to number of iterations */
 368         i = s1 - done + len;
 369         /* passed through loop at least once? */
 370         if (i > 0) {
 371                 if (!res && (s1 == done) &&
 372                     ((len == l1) || LDAP_UTF8_ISASCII(s1)) &&
 373                     ((len == l2) || LDAP_UTF8_ISASCII(s2))) {
 374                         /* all ascii and equal up to len */
 375                         return l1 - l2;
 376                 }
 377
 378                 /* rewind one char, and do normalized compare from there */
 379                 s1--;
 380                 s2--;
 381                 l1 -= i - 1;
 382                 l2 -= i - 1;
 383         }
 384
 385         /* Should first check to see if strings are already in
 386          * proper normalized form.
 387          */
 388         ucs = malloc( ( ( norm1 || l1 > l2 ) ? l1 : l2 ) * sizeof(*ucs) );
 389         if ( ucs == NULL ) {
 390                 return l1 > l2 ? 1 : -1; /* what to do??? */
 391         }
 392
 393         /*
 394          * XXYYZ: we convert to ucs4 even though -llunicode
 395          * expects ucs2 in an ac_uint4
 396          */
 397
 398         /* convert and normalize 1st string */
 399         for ( i = 0, ulen = 0; i < l1; i += len, ulen++ ) {
 400                 ucs[ulen] = ldap_x_utf8_to_ucs4( s1 + i );
 401                 if ( ucs[ulen] == LDAP_UCS4_INVALID ) {
 402                         free( ucs );
 403                         return -1; /* what to do??? */
 404                 }
 405                 len = LDAP_UTF8_CHARLEN( s1 + i );
 406         }
 407
 408         if ( norm1 ) {
 409                 ucsout1 = ucs;
 410                 l1 = ulen;
 411                 ucs = malloc( l2 * sizeof(*ucs) );
 412                 if ( ucs == NULL ) {
 413                         free( ucsout1 );
 414                         return l1 > l2 ? 1 : -1; /* what to do??? */
 415                 }
 416         } else {
 417                 uccompatdecomp( ucs, ulen, &ucsout1, &l1, ctx );
 418                 l1 = uccanoncomp( ucsout1, l1 );
 419         }
 420
 421         /* convert and normalize 2nd string */
 422         for ( i = 0, ulen = 0; i < l2; i += len, ulen++ ) {
 423                 ucs[ulen] = ldap_x_utf8_to_ucs4( s2 + i );
 424                 if ( ucs[ulen] == LDAP_UCS4_INVALID ) {
 425                         free( ucsout1 );
 426                         free( ucs );
 427                         return 1; /* what to do??? */
 428                 }
 429                 len = LDAP_UTF8_CHARLEN( s2 + i );
 430         }
 431
 432         if ( norm2 ) {
 433                 ucsout2 = ucs;
 434                 l2 = ulen;
 435         } else {
 436                 uccompatdecomp( ucs, ulen, &ucsout2, &l2, ctx );
 437                 l2 = uccanoncomp( ucsout2, l2 );
 438                 free( ucs );
 439         }
 440
 441         res = casefold
 442                 ? ucstrncasecmp( ucsout1, ucsout2, l1 < l2 ? l1 : l2 )
 443                 : ucstrncmp( ucsout1, ucsout2, l1 < l2 ? l1 : l2 );
 444         free( ucsout1 );
 445         free( ucsout2 );
 446
 447         if ( res != 0 ) {
 448                 return res;
 449         }
 450         if ( l1 == l2 ) {
 451                 return 0;
 452         }
 453         return l1 > l2 ? 1 : -1;
 454 }