lib/unistr.in.h

   1 /* Elementary Unicode string functions.
   2    Copyright (C) 2001-2002, 2005-2025 Free Software Foundation, Inc.
   3
   4    This file is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU Lesser General Public License as
   6    published by the Free Software Foundation; either version 2.1 of the
   7    License, or (at your option) any later version.
   8
   9    This file is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 #ifndef _UNISTR_H
  18 #define _UNISTR_H
  19
  20 #include "unitypes.h"
  21
  22 /* Get bool.  */
  23 #include <stdbool.h>
  24
  25 /* Get size_t, ptrdiff_t.  */
  26 #include <stddef.h>
  27
  28 /* Get free().  */
  29 #include <stdlib.h>
  30
  31 #ifdef __cplusplus
  32 extern "C" {
  33 #endif
  34
  35
  36 /* Conventions:
  37
  38    All functions prefixed with u8_ operate on UTF-8 encoded strings.
  39    Their unit is an uint8_t (1 byte).
  40
  41    All functions prefixed with u16_ operate on UTF-16 encoded strings.
  42    Their unit is an uint16_t (a 2-byte word).
  43
  44    All functions prefixed with u32_ operate on UCS-4 encoded strings.
  45    Their unit is an uint32_t (a 4-byte word).
  46
  47    All argument pairs (s, n) denote a Unicode string s[0..n-1] with exactly
  48    n units.
  49
  50    All arguments starting with "str" and the arguments of functions starting
  51    with u8_str/u16_str/u32_str denote a NUL terminated string, i.e. a string
  52    which terminates at the first NUL unit.  This termination unit is
  53    considered part of the string for all memory allocation purposes, but
  54    is not considered part of the string for all other logical purposes.
  55
  56    Functions returning a string result take a (resultbuf, lengthp) argument
  57    pair.  If resultbuf is not NULL and the result fits into *lengthp units,
  58    it is put in resultbuf, and resultbuf is returned.  Otherwise, a freshly
  59    allocated string is returned.  In both cases, *lengthp is set to the
  60    length (number of units) of the returned string.  In case of error,
  61    NULL is returned and errno is set.  */
  62
  63
  64 /* Elementary string checks.  */
  65
  66 /* Check whether an UTF-8 string is well-formed.
  67    Return NULL if valid, or a pointer to the first invalid unit otherwise.  */
  68 extern const uint8_t *
  69        u8_check (const uint8_t *s, size_t n)
  70        _UC_ATTRIBUTE_PURE;
  71
  72 /* Check whether an UTF-16 string is well-formed.
  73    Return NULL if valid, or a pointer to the first invalid unit otherwise.  */
  74 extern const uint16_t *
  75        u16_check (const uint16_t *s, size_t n)
  76        _UC_ATTRIBUTE_PURE;
  77
  78 /* Check whether an UCS-4 string is well-formed.
  79    Return NULL if valid, or a pointer to the first invalid unit otherwise.  */
  80 extern const uint32_t *
  81        u32_check (const uint32_t *s, size_t n)
  82        _UC_ATTRIBUTE_PURE;
  83
  84
  85 /* Elementary string conversions.  */
  86
  87 /* Convert an UTF-8 string to an UTF-16 string.  */
  88 extern uint16_t *
  89        u8_to_u16 (const uint8_t *s, size_t n, uint16_t *resultbuf,
  90                   size_t *lengthp);
  91
  92 /* Convert an UTF-8 string to an UCS-4 string.  */
  93 extern uint32_t *
  94        u8_to_u32 (const uint8_t *s, size_t n, uint32_t *resultbuf,
  95                   size_t *lengthp);
  96
  97 /* Convert an UTF-16 string to an UTF-8 string.  */
  98 extern uint8_t *
  99        u16_to_u8 (const uint16_t *s, size_t n, uint8_t *resultbuf,
 100                   size_t *lengthp);
 101
 102 /* Convert an UTF-16 string to an UCS-4 string.  */
 103 extern uint32_t *
 104        u16_to_u32 (const uint16_t *s, size_t n, uint32_t *resultbuf,
 105                    size_t *lengthp);
 106
 107 /* Convert an UCS-4 string to an UTF-8 string.  */
 108 extern uint8_t *
 109        u32_to_u8 (const uint32_t *s, size_t n, uint8_t *resultbuf,
 110                   size_t *lengthp);
 111
 112 /* Convert an UCS-4 string to an UTF-16 string.  */
 113 extern uint16_t *
 114        u32_to_u16 (const uint32_t *s, size_t n, uint16_t *resultbuf,
 115                    size_t *lengthp);
 116
 117
 118 /* Elementary string functions.  */
 119
 120 /* Return the length (number of units) of the first character in S, which is
 121    no longer than N.  Return 0 if it is the NUL character.  Return -1 upon
 122    failure.  */
 123 /* Similar to mblen(), except that s must not be NULL.  */
 124 extern int
 125        u8_mblen (const uint8_t *s, size_t n)
 126        _UC_ATTRIBUTE_PURE;
 127 extern int
 128        u16_mblen (const uint16_t *s, size_t n)
 129        _UC_ATTRIBUTE_PURE;
 130 extern int
 131        u32_mblen (const uint32_t *s, size_t n)
 132        _UC_ATTRIBUTE_PURE;
 133
 134 /* Return the length (number of units) of the first character in S, putting
 135    its 'ucs4_t' representation in *PUC.  Upon failure, *PUC is set to 0xfffd,
 136    and an appropriate number of units is returned.
 137    The number of available units, N, must be > 0.  */
 138 /* Similar to mbtowc(), except that puc and s must not be NULL, n must be > 0,
 139    and the NUL character is not treated specially.  */
 140 /* The variants with _unsafe suffix are for backward compatibility with
 141    libunistring versions < 0.9.7.  */
 142
 143 #if GNULIB_UNISTR_U8_MBTOUC_UNSAFE || HAVE_LIBUNISTRING
 144 # if !HAVE_INLINE
 145 extern int
 146        u8_mbtouc_unsafe (ucs4_t *puc, const uint8_t *s, size_t n);
 147 # else
 148 extern int
 149        u8_mbtouc_unsafe_aux (ucs4_t *puc, const uint8_t *s, size_t n);
 150 static inline int
 151 u8_mbtouc_unsafe (ucs4_t *puc, const uint8_t *s, size_t n)
 152 {
 153   uint8_t c = *s;
 154
 155   if (c < 0x80)
 156     {
 157       *puc = c;
 158       return 1;
 159     }
 160   else
 161     return u8_mbtouc_unsafe_aux (puc, s, n);
 162 }
 163 # endif
 164 #endif
 165
 166 #if GNULIB_UNISTR_U16_MBTOUC_UNSAFE || HAVE_LIBUNISTRING
 167 # if !HAVE_INLINE
 168 extern int
 169        u16_mbtouc_unsafe (ucs4_t *puc, const uint16_t *s, size_t n);
 170 # else
 171 extern int
 172        u16_mbtouc_unsafe_aux (ucs4_t *puc, const uint16_t *s, size_t n);
 173 static inline int
 174 u16_mbtouc_unsafe (ucs4_t *puc, const uint16_t *s, size_t n)
 175 {
 176   uint16_t c = *s;
 177
 178   if (c < 0xd800 || c >= 0xe000)
 179     {
 180       *puc = c;
 181       return 1;
 182     }
 183   else
 184     return u16_mbtouc_unsafe_aux (puc, s, n);
 185 }
 186 # endif
 187 #endif
 188
 189 #if GNULIB_UNISTR_U32_MBTOUC_UNSAFE || HAVE_LIBUNISTRING
 190 # if !HAVE_INLINE
 191 extern int
 192        u32_mbtouc_unsafe (ucs4_t *puc, const uint32_t *s, size_t n);
 193 # else
 194 static inline int
 195 u32_mbtouc_unsafe (ucs4_t *puc,
 196                    const uint32_t *s, _GL_ATTRIBUTE_MAYBE_UNUSED size_t n)
 197 {
 198   uint32_t c = *s;
 199
 200   if (c < 0xd800 || (c >= 0xe000 && c < 0x110000))
 201     *puc = c;
 202   else
 203     /* invalid multibyte character */
 204     *puc = 0xfffd;
 205   return 1;
 206 }
 207 # endif
 208 #endif
 209
 210 #if GNULIB_UNISTR_U8_MBTOUC || HAVE_LIBUNISTRING
 211 # if !HAVE_INLINE
 212 extern int
 213        u8_mbtouc (ucs4_t *puc, const uint8_t *s, size_t n);
 214 # else
 215 extern int
 216        u8_mbtouc_aux (ucs4_t *puc, const uint8_t *s, size_t n);
 217 static inline int
 218 u8_mbtouc (ucs4_t *puc, const uint8_t *s, size_t n)
 219 {
 220   uint8_t c = *s;
 221
 222   if (c < 0x80)
 223     {
 224       *puc = c;
 225       return 1;
 226     }
 227   else
 228     return u8_mbtouc_aux (puc, s, n);
 229 }
 230 # endif
 231 #endif
 232
 233 #if GNULIB_UNISTR_U16_MBTOUC || HAVE_LIBUNISTRING
 234 # if !HAVE_INLINE
 235 extern int
 236        u16_mbtouc (ucs4_t *puc, const uint16_t *s, size_t n);
 237 # else
 238 extern int
 239        u16_mbtouc_aux (ucs4_t *puc, const uint16_t *s, size_t n);
 240 static inline int
 241 u16_mbtouc (ucs4_t *puc, const uint16_t *s, size_t n)
 242 {
 243   uint16_t c = *s;
 244
 245   if (c < 0xd800 || c >= 0xe000)
 246     {
 247       *puc = c;
 248       return 1;
 249     }
 250   else
 251     return u16_mbtouc_aux (puc, s, n);
 252 }
 253 # endif
 254 #endif
 255
 256 #if GNULIB_UNISTR_U32_MBTOUC || HAVE_LIBUNISTRING
 257 # if !HAVE_INLINE
 258 extern int
 259        u32_mbtouc (ucs4_t *puc, const uint32_t *s, size_t n);
 260 # else
 261 static inline int
 262 u32_mbtouc (ucs4_t *puc, const uint32_t *s,
 263             _GL_ATTRIBUTE_MAYBE_UNUSED size_t n)
 264 {
 265   uint32_t c = *s;
 266
 267   if (c < 0xd800 || (c >= 0xe000 && c < 0x110000))
 268     *puc = c;
 269   else
 270     /* invalid multibyte character */
 271     *puc = 0xfffd;
 272   return 1;
 273 }
 274 # endif
 275 #endif
 276
 277 /* Return the length (number of units) of the first character in S, putting
 278    its 'ucs4_t' representation in *PUC.  Upon failure, *PUC is set to 0xfffd,
 279    and -1 is returned for an invalid sequence of units, -2 is returned for an
 280    incomplete sequence of units.
 281    The number of available units, N, must be > 0.  */
 282 /* Similar to u*_mbtouc(), except that the return value gives more details
 283    about the failure, similar to mbrtowc().  */
 284
 285 #if GNULIB_UNISTR_U8_MBTOUCR || HAVE_LIBUNISTRING
 286 extern int
 287        u8_mbtoucr (ucs4_t *puc, const uint8_t *s, size_t n);
 288 #endif
 289
 290 #if GNULIB_UNISTR_U16_MBTOUCR || HAVE_LIBUNISTRING
 291 extern int
 292        u16_mbtoucr (ucs4_t *puc, const uint16_t *s, size_t n);
 293 #endif
 294
 295 #if GNULIB_UNISTR_U32_MBTOUCR || HAVE_LIBUNISTRING
 296 extern int
 297        u32_mbtoucr (ucs4_t *puc, const uint32_t *s, size_t n);
 298 #endif
 299
 300 /* Put the multibyte character represented by UC in S, returning its
 301    length.  Return -1 upon failure, -2 if the number of available units, N,
 302    is too small.  The latter case cannot occur if N >= 6/2/1, respectively.  */
 303 /* Similar to wctomb(), except that s must not be NULL, and the argument n
 304    must be specified.  */
 305
 306 #if GNULIB_UNISTR_U8_UCTOMB || HAVE_LIBUNISTRING
 307 /* Auxiliary function, also used by u8_chr, u8_strchr, u8_strrchr.  */
 308 extern int
 309        u8_uctomb_aux (uint8_t *s, ucs4_t uc, ptrdiff_t n);
 310 # if !HAVE_INLINE
 311 extern int
 312        u8_uctomb (uint8_t *s, ucs4_t uc, ptrdiff_t n);
 313 # else
 314 static inline int
 315 u8_uctomb (uint8_t *s, ucs4_t uc, ptrdiff_t n)
 316 {
 317   if (uc < 0x80 && n > 0)
 318     {
 319       s[0] = uc;
 320       return 1;
 321     }
 322   else
 323     return u8_uctomb_aux (s, uc, n);
 324 }
 325 # endif
 326 #endif
 327
 328 #if GNULIB_UNISTR_U16_UCTOMB || HAVE_LIBUNISTRING
 329 /* Auxiliary function, also used by u16_chr, u16_strchr, u16_strrchr.  */
 330 extern int
 331        u16_uctomb_aux (uint16_t *s, ucs4_t uc, ptrdiff_t n);
 332 # if !HAVE_INLINE
 333 extern int
 334        u16_uctomb (uint16_t *s, ucs4_t uc, ptrdiff_t n);
 335 # else
 336 static inline int
 337 u16_uctomb (uint16_t *s, ucs4_t uc, ptrdiff_t n)
 338 {
 339   if (uc < 0xd800 && n > 0)
 340     {
 341       s[0] = uc;
 342       return 1;
 343     }
 344   else
 345     return u16_uctomb_aux (s, uc, n);
 346 }
 347 # endif
 348 #endif
 349
 350 #if GNULIB_UNISTR_U32_UCTOMB || HAVE_LIBUNISTRING
 351 # if !HAVE_INLINE
 352 extern int
 353        u32_uctomb (uint32_t *s, ucs4_t uc, ptrdiff_t n);
 354 # else
 355 static inline int
 356 u32_uctomb (uint32_t *s, ucs4_t uc, ptrdiff_t n)
 357 {
 358   if (uc < 0xd800 || (uc >= 0xe000 && uc < 0x110000))
 359     {
 360       if (n > 0)
 361         {
 362           *s = uc;
 363           return 1;
 364         }
 365       else
 366         return -2;
 367     }
 368   else
 369     return -1;
 370 }
 371 # endif
 372 #endif
 373
 374 /* Copy N units from SRC to DEST.  */
 375 /* Similar to memcpy().  */
 376 extern uint8_t *
 377        u8_cpy (uint8_t *_UC_RESTRICT dest, const uint8_t *src, size_t n);
 378 extern uint16_t *
 379        u16_cpy (uint16_t *_UC_RESTRICT dest, const uint16_t *src, size_t n);
 380 extern uint32_t *
 381        u32_cpy (uint32_t *_UC_RESTRICT dest, const uint32_t *src, size_t n);
 382
 383 /* Copy N units from SRC to DEST, returning pointer after last written unit.  */
 384 /* Similar to mempcpy().  */
 385 extern uint8_t *
 386        u8_pcpy (uint8_t *_UC_RESTRICT dest, const uint8_t *src, size_t n);
 387 extern uint16_t *
 388        u16_pcpy (uint16_t *_UC_RESTRICT dest, const uint16_t *src, size_t n);
 389 extern uint32_t *
 390        u32_pcpy (uint32_t *_UC_RESTRICT dest, const uint32_t *src, size_t n);
 391
 392 /* Copy N units from SRC to DEST, guaranteeing correct behavior for
 393    overlapping memory areas.  */
 394 /* Similar to memmove().  */
 395 extern uint8_t *
 396        u8_move (uint8_t *dest, const uint8_t *src, size_t n);
 397 extern uint16_t *
 398        u16_move (uint16_t *dest, const uint16_t *src, size_t n);
 399 extern uint32_t *
 400        u32_move (uint32_t *dest, const uint32_t *src, size_t n);
 401
 402 /* Set the first N characters of S to UC.  UC should be a character that
 403    occupies only 1 unit.  */
 404 /* Similar to memset().  */
 405 extern uint8_t *
 406        u8_set (uint8_t *s, ucs4_t uc, size_t n);
 407 extern uint16_t *
 408        u16_set (uint16_t *s, ucs4_t uc, size_t n);
 409 extern uint32_t *
 410        u32_set (uint32_t *s, ucs4_t uc, size_t n);
 411
 412 /* Compare S1 and S2, each of length N.  */
 413 /* Similar to memcmp().  */
 414 extern int
 415        u8_cmp (const uint8_t *s1, const uint8_t *s2, size_t n)
 416        _UC_ATTRIBUTE_PURE;
 417 extern int
 418        u16_cmp (const uint16_t *s1, const uint16_t *s2, size_t n)
 419        _UC_ATTRIBUTE_PURE;
 420 extern int
 421        u32_cmp (const uint32_t *s1, const uint32_t *s2, size_t n)
 422        _UC_ATTRIBUTE_PURE;
 423
 424 /* Compare S1 and S2.  */
 425 /* Similar to the gnulib function memcmp2().  */
 426 extern int
 427        u8_cmp2 (const uint8_t *s1, size_t n1, const uint8_t *s2, size_t n2)
 428        _UC_ATTRIBUTE_PURE;
 429 extern int
 430        u16_cmp2 (const uint16_t *s1, size_t n1, const uint16_t *s2, size_t n2)
 431        _UC_ATTRIBUTE_PURE;
 432 extern int
 433        u32_cmp2 (const uint32_t *s1, size_t n1, const uint32_t *s2, size_t n2)
 434        _UC_ATTRIBUTE_PURE;
 435
 436 /* Search the string at S for UC.  */
 437 /* Similar to memchr().  */
 438 extern uint8_t *
 439        u8_chr (const uint8_t *s, size_t n, ucs4_t uc)
 440        _UC_ATTRIBUTE_PURE;
 441 extern uint16_t *
 442        u16_chr (const uint16_t *s, size_t n, ucs4_t uc)
 443        _UC_ATTRIBUTE_PURE;
 444 extern uint32_t *
 445        u32_chr (const uint32_t *s, size_t n, ucs4_t uc)
 446        _UC_ATTRIBUTE_PURE;
 447
 448 /* Count the number of Unicode characters in the N units from S.  */
 449 /* Similar to mbsnlen().  */
 450 extern size_t
 451        u8_mbsnlen (const uint8_t *s, size_t n)
 452        _UC_ATTRIBUTE_PURE;
 453 extern size_t
 454        u16_mbsnlen (const uint16_t *s, size_t n)
 455        _UC_ATTRIBUTE_PURE;
 456 extern size_t
 457        u32_mbsnlen (const uint32_t *s, size_t n)
 458        _UC_ATTRIBUTE_PURE;
 459
 460 /* Elementary string functions with memory allocation.  */
 461
 462 /* Make a freshly allocated copy of S, of length N.  */
 463 extern uint8_t *
 464        u8_cpy_alloc (const uint8_t *s, size_t n);
 465 extern uint16_t *
 466        u16_cpy_alloc (const uint16_t *s, size_t n);
 467 extern uint32_t *
 468        u32_cpy_alloc (const uint32_t *s, size_t n);
 469
 470 /* Elementary string functions on NUL terminated strings.  */
 471
 472 /* Return the length (number of units) of the first character in S.
 473    Return 0 if it is the NUL character.  Return -1 upon failure.  */
 474 extern int
 475        u8_strmblen (const uint8_t *s)
 476        _UC_ATTRIBUTE_PURE;
 477 extern int
 478        u16_strmblen (const uint16_t *s)
 479        _UC_ATTRIBUTE_PURE;
 480 extern int
 481        u32_strmblen (const uint32_t *s)
 482        _UC_ATTRIBUTE_PURE;
 483
 484 /* Return the length (number of units) of the first character in S, putting
 485    its 'ucs4_t' representation in *PUC.  Return 0 if it is the NUL
 486    character.  Return -1 upon failure.  */
 487 extern int
 488        u8_strmbtouc (ucs4_t *puc, const uint8_t *s);
 489 extern int
 490        u16_strmbtouc (ucs4_t *puc, const uint16_t *s);
 491 extern int
 492        u32_strmbtouc (ucs4_t *puc, const uint32_t *s);
 493
 494 /* Forward iteration step.  Advances the pointer past the next character,
 495    or returns NULL if the end of the string has been reached.  Puts the
 496    character's 'ucs4_t' representation in *PUC.  */
 497 extern const uint8_t *
 498        u8_next (ucs4_t *puc, const uint8_t *s);
 499 extern const uint16_t *
 500        u16_next (ucs4_t *puc, const uint16_t *s);
 501 extern const uint32_t *
 502        u32_next (ucs4_t *puc, const uint32_t *s);
 503
 504 /* Backward iteration step.  Advances the pointer to point to the previous
 505    character, or returns NULL if the beginning of the string had been reached.
 506    Puts the character's 'ucs4_t' representation in *PUC.  */
 507 extern const uint8_t *
 508        u8_prev (ucs4_t *puc, const uint8_t *s, const uint8_t *start);
 509 extern const uint16_t *
 510        u16_prev (ucs4_t *puc, const uint16_t *s, const uint16_t *start);
 511 extern const uint32_t *
 512        u32_prev (ucs4_t *puc, const uint32_t *s, const uint32_t *start);
 513
 514 /* Return the number of units in S.  */
 515 /* Similar to strlen(), wcslen().  */
 516 extern size_t
 517        u8_strlen (const uint8_t *s)
 518        _UC_ATTRIBUTE_PURE;
 519 extern size_t
 520        u16_strlen (const uint16_t *s)
 521        _UC_ATTRIBUTE_PURE;
 522 extern size_t
 523        u32_strlen (const uint32_t *s)
 524        _UC_ATTRIBUTE_PURE;
 525
 526 /* Return the number of units in S, but at most MAXLEN.  */
 527 /* Similar to strnlen(), wcsnlen().  */
 528 extern size_t
 529        u8_strnlen (const uint8_t *s, size_t maxlen)
 530        _UC_ATTRIBUTE_PURE;
 531 extern size_t
 532        u16_strnlen (const uint16_t *s, size_t maxlen)
 533        _UC_ATTRIBUTE_PURE;
 534 extern size_t
 535        u32_strnlen (const uint32_t *s, size_t maxlen)
 536        _UC_ATTRIBUTE_PURE;
 537
 538 /* Copy SRC to DEST.  */
 539 /* Similar to strcpy(), wcscpy().  */
 540 extern uint8_t *
 541        u8_strcpy (uint8_t *_UC_RESTRICT dest, const uint8_t *src);
 542 extern uint16_t *
 543        u16_strcpy (uint16_t *_UC_RESTRICT dest, const uint16_t *src);
 544 extern uint32_t *
 545        u32_strcpy (uint32_t *_UC_RESTRICT dest, const uint32_t *src);
 546
 547 /* Copy SRC to DEST, returning the address of the terminating NUL in DEST.  */
 548 /* Similar to stpcpy().  */
 549 extern uint8_t *
 550        u8_stpcpy (uint8_t *_UC_RESTRICT dest, const uint8_t *src);
 551 extern uint16_t *
 552        u16_stpcpy (uint16_t *_UC_RESTRICT dest, const uint16_t *src);
 553 extern uint32_t *
 554        u32_stpcpy (uint32_t *_UC_RESTRICT dest, const uint32_t *src);
 555
 556 /* Copy no more than N units of SRC to DEST.  */
 557 /* Similar to strncpy(), wcsncpy().  */
 558 extern uint8_t *
 559        u8_strncpy (uint8_t *_UC_RESTRICT dest, const uint8_t *src, size_t n);
 560 extern uint16_t *
 561        u16_strncpy (uint16_t *_UC_RESTRICT dest, const uint16_t *src, size_t n);
 562 extern uint32_t *
 563        u32_strncpy (uint32_t *_UC_RESTRICT dest, const uint32_t *src, size_t n);
 564
 565 /* Copy no more than N units of SRC to DEST.  Return a pointer past the last
 566    non-NUL unit written into DEST.  */
 567 /* Similar to stpncpy().  */
 568 extern uint8_t *
 569        u8_stpncpy (uint8_t *_UC_RESTRICT dest, const uint8_t *src, size_t n);
 570 extern uint16_t *
 571        u16_stpncpy (uint16_t *_UC_RESTRICT dest, const uint16_t *src, size_t n);
 572 extern uint32_t *
 573        u32_stpncpy (uint32_t *_UC_RESTRICT dest, const uint32_t *src, size_t n);
 574
 575 /* Append SRC onto DEST.  */
 576 /* Similar to strcat(), wcscat().  */
 577 extern uint8_t *
 578        u8_strcat (uint8_t *_UC_RESTRICT dest, const uint8_t *src);
 579 extern uint16_t *
 580        u16_strcat (uint16_t *_UC_RESTRICT dest, const uint16_t *src);
 581 extern uint32_t *
 582        u32_strcat (uint32_t *_UC_RESTRICT dest, const uint32_t *src);
 583
 584 /* Append no more than N units of SRC onto DEST.  */
 585 /* Similar to strncat(), wcsncat().  */
 586 extern uint8_t *
 587        u8_strncat (uint8_t *_UC_RESTRICT dest, const uint8_t *src, size_t n);
 588 extern uint16_t *
 589        u16_strncat (uint16_t *_UC_RESTRICT dest, const uint16_t *src, size_t n);
 590 extern uint32_t *
 591        u32_strncat (uint32_t *_UC_RESTRICT dest, const uint32_t *src, size_t n);
 592
 593 /* Compare S1 and S2.  */
 594 /* Similar to strcmp(), wcscmp().  */
 595 #ifdef __sun
 596 /* Avoid a collision with the u8_strcmp() function in Solaris 11 libc.  */
 597 extern int
 598        u8_strcmp_gnu (const uint8_t *s1, const uint8_t *s2)
 599        _UC_ATTRIBUTE_PURE;
 600 # define u8_strcmp u8_strcmp_gnu
 601 #else
 602 extern int
 603        u8_strcmp (const uint8_t *s1, const uint8_t *s2)
 604        _UC_ATTRIBUTE_PURE;
 605 #endif
 606 extern int
 607        u16_strcmp (const uint16_t *s1, const uint16_t *s2)
 608        _UC_ATTRIBUTE_PURE;
 609 extern int
 610        u32_strcmp (const uint32_t *s1, const uint32_t *s2)
 611        _UC_ATTRIBUTE_PURE;
 612
 613 /* Compare S1 and S2 using the collation rules of the current locale.
 614    Return -1 if S1 < S2, 0 if S1 = S2, 1 if S1 > S2.
 615    Upon failure, set errno and return any value.  */
 616 /* Similar to strcoll(), wcscoll().  */
 617 extern int
 618        u8_strcoll (const uint8_t *s1, const uint8_t *s2);
 619 extern int
 620        u16_strcoll (const uint16_t *s1, const uint16_t *s2);
 621 extern int
 622        u32_strcoll (const uint32_t *s1, const uint32_t *s2);
 623
 624 /* Compare no more than N units of S1 and S2.  */
 625 /* Similar to strncmp(), wcsncmp().  */
 626 extern int
 627        u8_strncmp (const uint8_t *s1, const uint8_t *s2, size_t n)
 628        _UC_ATTRIBUTE_PURE;
 629 extern int
 630        u16_strncmp (const uint16_t *s1, const uint16_t *s2, size_t n)
 631        _UC_ATTRIBUTE_PURE;
 632 extern int
 633        u32_strncmp (const uint32_t *s1, const uint32_t *s2, size_t n)
 634        _UC_ATTRIBUTE_PURE;
 635
 636 /* Duplicate S, returning an identical malloc'd string.  */
 637 /* Similar to strdup(), wcsdup().  */
 638 extern uint8_t *
 639        u8_strdup (const uint8_t *s)
 640        _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_DEALLOC_FREE;
 641 extern uint16_t *
 642        u16_strdup (const uint16_t *s)
 643        _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_DEALLOC_FREE;
 644 extern uint32_t *
 645        u32_strdup (const uint32_t *s)
 646        _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_DEALLOC_FREE;
 647
 648 /* Find the first occurrence of UC in STR.  */
 649 /* Similar to strchr(), wcschr().  */
 650 extern uint8_t *
 651        u8_strchr (const uint8_t *str, ucs4_t uc)
 652        _UC_ATTRIBUTE_PURE;
 653 extern uint16_t *
 654        u16_strchr (const uint16_t *str, ucs4_t uc)
 655        _UC_ATTRIBUTE_PURE;
 656 extern uint32_t *
 657        u32_strchr (const uint32_t *str, ucs4_t uc)
 658        _UC_ATTRIBUTE_PURE;
 659
 660 /* Find the last occurrence of UC in STR.  */
 661 /* Similar to strrchr(), wcsrchr().  */
 662 extern uint8_t *
 663        u8_strrchr (const uint8_t *str, ucs4_t uc)
 664        _UC_ATTRIBUTE_PURE;
 665 extern uint16_t *
 666        u16_strrchr (const uint16_t *str, ucs4_t uc)
 667        _UC_ATTRIBUTE_PURE;
 668 extern uint32_t *
 669        u32_strrchr (const uint32_t *str, ucs4_t uc)
 670        _UC_ATTRIBUTE_PURE;
 671
 672 /* Return the length of the initial segment of STR which consists entirely
 673    of Unicode characters not in REJECT.  */
 674 /* Similar to strcspn(), wcscspn().  */
 675 extern size_t
 676        u8_strcspn (const uint8_t *str, const uint8_t *reject)
 677        _UC_ATTRIBUTE_PURE;
 678 extern size_t
 679        u16_strcspn (const uint16_t *str, const uint16_t *reject)
 680        _UC_ATTRIBUTE_PURE;
 681 extern size_t
 682        u32_strcspn (const uint32_t *str, const uint32_t *reject)
 683        _UC_ATTRIBUTE_PURE;
 684
 685 /* Return the length of the initial segment of STR which consists entirely
 686    of Unicode characters in ACCEPT.  */
 687 /* Similar to strspn(), wcsspn().  */
 688 extern size_t
 689        u8_strspn (const uint8_t *str, const uint8_t *accept)
 690        _UC_ATTRIBUTE_PURE;
 691 extern size_t
 692        u16_strspn (const uint16_t *str, const uint16_t *accept)
 693        _UC_ATTRIBUTE_PURE;
 694 extern size_t
 695        u32_strspn (const uint32_t *str, const uint32_t *accept)
 696        _UC_ATTRIBUTE_PURE;
 697
 698 /* Find the first occurrence in STR of any character in ACCEPT.  */
 699 /* Similar to strpbrk(), wcspbrk().  */
 700 extern uint8_t *
 701        u8_strpbrk (const uint8_t *str, const uint8_t *accept)
 702        _UC_ATTRIBUTE_PURE;
 703 extern uint16_t *
 704        u16_strpbrk (const uint16_t *str, const uint16_t *accept)
 705        _UC_ATTRIBUTE_PURE;
 706 extern uint32_t *
 707        u32_strpbrk (const uint32_t *str, const uint32_t *accept)
 708        _UC_ATTRIBUTE_PURE;
 709
 710 /* Find the first occurrence of NEEDLE in HAYSTACK.  */
 711 /* Similar to strstr(), wcsstr().  */
 712 extern uint8_t *
 713        u8_strstr (const uint8_t *haystack, const uint8_t *needle)
 714        _UC_ATTRIBUTE_PURE;
 715 extern uint16_t *
 716        u16_strstr (const uint16_t *haystack, const uint16_t *needle)
 717        _UC_ATTRIBUTE_PURE;
 718 extern uint32_t *
 719        u32_strstr (const uint32_t *haystack, const uint32_t *needle)
 720        _UC_ATTRIBUTE_PURE;
 721
 722 /* Test whether STR starts with PREFIX.  */
 723 extern bool
 724        u8_startswith (const uint8_t *str, const uint8_t *prefix)
 725        _UC_ATTRIBUTE_PURE;
 726 extern bool
 727        u16_startswith (const uint16_t *str, const uint16_t *prefix)
 728        _UC_ATTRIBUTE_PURE;
 729 extern bool
 730        u32_startswith (const uint32_t *str, const uint32_t *prefix)
 731        _UC_ATTRIBUTE_PURE;
 732
 733 /* Test whether STR ends with SUFFIX.  */
 734 extern bool
 735        u8_endswith (const uint8_t *str, const uint8_t *suffix)
 736        _UC_ATTRIBUTE_PURE;
 737 extern bool
 738        u16_endswith (const uint16_t *str, const uint16_t *suffix)
 739        _UC_ATTRIBUTE_PURE;
 740 extern bool
 741        u32_endswith (const uint32_t *str, const uint32_t *suffix)
 742        _UC_ATTRIBUTE_PURE;
 743
 744 /* Divide STR into tokens separated by characters in DELIM.
 745    This interface is actually more similar to wcstok than to strtok.  */
 746 /* Similar to strtok_r(), wcstok().  */
 747 extern uint8_t *
 748        u8_strtok (uint8_t *_UC_RESTRICT str, const uint8_t *delim,
 749                   uint8_t **ptr);
 750 extern uint16_t *
 751        u16_strtok (uint16_t *_UC_RESTRICT str, const uint16_t *delim,
 752                    uint16_t **ptr);
 753 extern uint32_t *
 754        u32_strtok (uint32_t *_UC_RESTRICT str, const uint32_t *delim,
 755                    uint32_t **ptr);
 756
 757
 758 #ifdef __cplusplus
 759 }
 760 #endif
 761
 762 #endif /* _UNISTR_H */