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1 | /* |
1 | /* |
2 | * Copyright (c) 2005 Martin Decky |
2 | * Copyright (c) 2005 Martin Decky |
3 | * Copyright (c) 2008 Jiri Svoboda |
3 | * Copyright (c) 2008 Jiri Svoboda |
4 | * All rights reserved. |
4 | * All rights reserved. |
5 | * |
5 | * |
6 | * Redistribution and use in source and binary forms, with or without |
6 | * Redistribution and use in source and binary forms, with or without |
7 | * modification, are permitted provided that the following conditions |
7 | * modification, are permitted provided that the following conditions |
8 | * are met: |
8 | * are met: |
9 | * |
9 | * |
10 | * - Redistributions of source code must retain the above copyright |
10 | * - Redistributions of source code must retain the above copyright |
11 | * notice, this list of conditions and the following disclaimer. |
11 | * notice, this list of conditions and the following disclaimer. |
12 | * - Redistributions in binary form must reproduce the above copyright |
12 | * - Redistributions in binary form must reproduce the above copyright |
13 | * notice, this list of conditions and the following disclaimer in the |
13 | * notice, this list of conditions and the following disclaimer in the |
14 | * documentation and/or other materials provided with the distribution. |
14 | * documentation and/or other materials provided with the distribution. |
15 | * - The name of the author may not be used to endorse or promote products |
15 | * - The name of the author may not be used to endorse or promote products |
16 | * derived from this software without specific prior written permission. |
16 | * derived from this software without specific prior written permission. |
17 | * |
17 | * |
18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
28 | */ |
28 | */ |
29 | 29 | ||
30 | /** @addtogroup libc |
30 | /** @addtogroup libc |
31 | * @{ |
31 | * @{ |
32 | */ |
32 | */ |
33 | /** @file |
33 | /** @file |
34 | */ |
34 | */ |
35 | 35 | ||
36 | #include <string.h> |
36 | #include <string.h> |
37 | #include <stdlib.h> |
37 | #include <stdlib.h> |
38 | #include <limits.h> |
38 | #include <limits.h> |
39 | #include <ctype.h> |
39 | #include <ctype.h> |
40 | #include <malloc.h> |
40 | #include <malloc.h> |
- | 41 | #include <errno.h> |
|
- | 42 | #include <align.h> |
|
- | 43 | #include <string.h> |
|
- | 44 | ||
- | 45 | /** Byte mask consisting of lowest @n bits (out of 8) */ |
|
- | 46 | #define LO_MASK_8(n) ((uint8_t) ((1 << (n)) - 1)) |
|
- | 47 | ||
- | 48 | /** Byte mask consisting of lowest @n bits (out of 32) */ |
|
- | 49 | #define LO_MASK_32(n) ((uint32_t) ((1 << (n)) - 1)) |
|
- | 50 | ||
- | 51 | /** Byte mask consisting of highest @n bits (out of 8) */ |
|
- | 52 | #define HI_MASK_8(n) (~LO_MASK_8(8 - (n))) |
|
- | 53 | ||
- | 54 | /** Number of data bits in a UTF-8 continuation byte */ |
|
- | 55 | #define CONT_BITS 6 |
|
- | 56 | ||
- | 57 | /** Decode a single character from a string. |
|
- | 58 | * |
|
- | 59 | * Decode a single character from a string of size @a size. Decoding starts |
|
- | 60 | * at @a offset and this offset is moved to the beginning of the next |
|
- | 61 | * character. In case of decoding error, offset generally advances at least |
|
- | 62 | * by one. However, offset is never moved beyond size. |
|
- | 63 | * |
|
- | 64 | * @param str String (not necessarily NULL-terminated). |
|
- | 65 | * @param offset Byte offset in string where to start decoding. |
|
- | 66 | * @param size Size of the string (in bytes). |
|
- | 67 | * |
|
- | 68 | * @return Value of decoded character, U_SPECIAL on decoding error or |
|
- | 69 | * NULL if attempt to decode beyond @a size. |
|
- | 70 | * |
|
- | 71 | */ |
|
- | 72 | wchar_t str_decode(const char *str, size_t *offset, size_t size) |
|
- | 73 | { |
|
- | 74 | if (*offset + 1 > size) |
|
- | 75 | return 0; |
|
- | 76 | ||
- | 77 | /* First byte read from string */ |
|
- | 78 | uint8_t b0 = (uint8_t) str[(*offset)++]; |
|
- | 79 | ||
- | 80 | /* Determine code length */ |
|
- | 81 | ||
- | 82 | unsigned int b0_bits; /* Data bits in first byte */ |
|
- | 83 | unsigned int cbytes; /* Number of continuation bytes */ |
|
- | 84 | ||
- | 85 | if ((b0 & 0x80) == 0) { |
|
- | 86 | /* 0xxxxxxx (Plain ASCII) */ |
|
- | 87 | b0_bits = 7; |
|
- | 88 | cbytes = 0; |
|
- | 89 | } else if ((b0 & 0xe0) == 0xc0) { |
|
- | 90 | /* 110xxxxx 10xxxxxx */ |
|
- | 91 | b0_bits = 5; |
|
- | 92 | cbytes = 1; |
|
- | 93 | } else if ((b0 & 0xf0) == 0xe0) { |
|
- | 94 | /* 1110xxxx 10xxxxxx 10xxxxxx */ |
|
- | 95 | b0_bits = 4; |
|
- | 96 | cbytes = 2; |
|
- | 97 | } else if ((b0 & 0xf8) == 0xf0) { |
|
- | 98 | /* 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx */ |
|
- | 99 | b0_bits = 3; |
|
- | 100 | cbytes = 3; |
|
- | 101 | } else { |
|
- | 102 | /* 10xxxxxx -- unexpected continuation byte */ |
|
- | 103 | return U_SPECIAL; |
|
- | 104 | } |
|
- | 105 | ||
- | 106 | if (*offset + cbytes > size) |
|
- | 107 | return U_SPECIAL; |
|
- | 108 | ||
- | 109 | wchar_t ch = b0 & LO_MASK_8(b0_bits); |
|
- | 110 | ||
- | 111 | /* Decode continuation bytes */ |
|
- | 112 | while (cbytes > 0) { |
|
- | 113 | uint8_t b = (uint8_t) str[(*offset)++]; |
|
- | 114 | ||
- | 115 | /* Must be 10xxxxxx */ |
|
- | 116 | if ((b & 0xc0) != 0x80) |
|
- | 117 | return U_SPECIAL; |
|
- | 118 | ||
- | 119 | /* Shift data bits to ch */ |
|
- | 120 | ch = (ch << CONT_BITS) | (wchar_t) (b & LO_MASK_8(CONT_BITS)); |
|
- | 121 | cbytes--; |
|
- | 122 | } |
|
- | 123 | ||
- | 124 | return ch; |
|
- | 125 | } |
|
- | 126 | ||
- | 127 | /** Encode a single character to string representation. |
|
- | 128 | * |
|
- | 129 | * Encode a single character to string representation (i.e. UTF-8) and store |
|
- | 130 | * it into a buffer at @a offset. Encoding starts at @a offset and this offset |
|
- | 131 | * is moved to the position where the next character can be written to. |
|
- | 132 | * |
|
- | 133 | * @param ch Input character. |
|
- | 134 | * @param str Output buffer. |
|
- | 135 | * @param offset Byte offset where to start writing. |
|
- | 136 | * @param size Size of the output buffer (in bytes). |
|
- | 137 | * |
|
- | 138 | * @return EOK if the character was encoded successfully, EOVERFLOW if there |
|
- | 139 | * was not enough space in the output buffer or EINVAL if the character |
|
- | 140 | * code was invalid. |
|
- | 141 | */ |
|
- | 142 | int chr_encode(const wchar_t ch, char *str, size_t *offset, size_t size) |
|
- | 143 | { |
|
- | 144 | if (*offset >= size) |
|
- | 145 | return EOVERFLOW; |
|
- | 146 | ||
- | 147 | if (!chr_check(ch)) |
|
- | 148 | return EINVAL; |
|
- | 149 | ||
- | 150 | /* Unsigned version of ch (bit operations should only be done |
|
- | 151 | on unsigned types). */ |
|
- | 152 | uint32_t cc = (uint32_t) ch; |
|
- | 153 | ||
- | 154 | /* Determine how many continuation bytes are needed */ |
|
- | 155 | ||
- | 156 | unsigned int b0_bits; /* Data bits in first byte */ |
|
- | 157 | unsigned int cbytes; /* Number of continuation bytes */ |
|
- | 158 | ||
- | 159 | if ((cc & ~LO_MASK_32(7)) == 0) { |
|
- | 160 | b0_bits = 7; |
|
- | 161 | cbytes = 0; |
|
- | 162 | } else if ((cc & ~LO_MASK_32(11)) == 0) { |
|
- | 163 | b0_bits = 5; |
|
- | 164 | cbytes = 1; |
|
- | 165 | } else if ((cc & ~LO_MASK_32(16)) == 0) { |
|
- | 166 | b0_bits = 4; |
|
- | 167 | cbytes = 2; |
|
- | 168 | } else if ((cc & ~LO_MASK_32(21)) == 0) { |
|
- | 169 | b0_bits = 3; |
|
- | 170 | cbytes = 3; |
|
- | 171 | } else { |
|
- | 172 | /* Codes longer than 21 bits are not supported */ |
|
- | 173 | return EINVAL; |
|
- | 174 | } |
|
- | 175 | ||
- | 176 | /* Check for available space in buffer */ |
|
- | 177 | if (*offset + cbytes >= size) |
|
- | 178 | return EOVERFLOW; |
|
- | 179 | ||
- | 180 | /* Encode continuation bytes */ |
|
- | 181 | unsigned int i; |
|
- | 182 | for (i = cbytes; i > 0; i--) { |
|
- | 183 | str[*offset + i] = 0x80 | (cc & LO_MASK_32(CONT_BITS)); |
|
- | 184 | cc = cc >> CONT_BITS; |
|
- | 185 | } |
|
- | 186 | ||
- | 187 | /* Encode first byte */ |
|
- | 188 | str[*offset] = (cc & LO_MASK_32(b0_bits)) | HI_MASK_8(8 - b0_bits - 1); |
|
- | 189 | ||
- | 190 | /* Advance offset */ |
|
- | 191 | *offset += cbytes + 1; |
|
- | 192 | ||
- | 193 | return EOK; |
|
- | 194 | } |
|
- | 195 | ||
- | 196 | /** Get size of string. |
|
- | 197 | * |
|
- | 198 | * Get the number of bytes which are used by the string @a str (excluding the |
|
- | 199 | * NULL-terminator). |
|
- | 200 | * |
|
- | 201 | * @param str String to consider. |
|
- | 202 | * |
|
- | 203 | * @return Number of bytes used by the string |
|
- | 204 | * |
|
- | 205 | */ |
|
- | 206 | size_t str_size(const char *str) |
|
- | 207 | { |
|
- | 208 | size_t size = 0; |
|
- | 209 | ||
- | 210 | while (*str++ != 0) |
|
- | 211 | size++; |
|
- | 212 | ||
- | 213 | return size; |
|
- | 214 | } |
|
- | 215 | ||
- | 216 | /** Get size of wide string. |
|
- | 217 | * |
|
- | 218 | * Get the number of bytes which are used by the wide string @a str (excluding the |
|
- | 219 | * NULL-terminator). |
|
- | 220 | * |
|
- | 221 | * @param str Wide string to consider. |
|
- | 222 | * |
|
- | 223 | * @return Number of bytes used by the wide string |
|
- | 224 | * |
|
- | 225 | */ |
|
- | 226 | size_t wstr_size(const wchar_t *str) |
|
- | 227 | { |
|
- | 228 | return (wstr_length(str) * sizeof(wchar_t)); |
|
- | 229 | } |
|
- | 230 | ||
- | 231 | /** Get size of string with length limit. |
|
- | 232 | * |
|
- | 233 | * Get the number of bytes which are used by up to @a max_len first |
|
- | 234 | * characters in the string @a str. If @a max_len is greater than |
|
- | 235 | * the length of @a str, the entire string is measured (excluding the |
|
- | 236 | * NULL-terminator). |
|
- | 237 | * |
|
- | 238 | * @param str String to consider. |
|
- | 239 | * @param max_len Maximum number of characters to measure. |
|
- | 240 | * |
|
- | 241 | * @return Number of bytes used by the characters. |
|
- | 242 | * |
|
- | 243 | */ |
|
- | 244 | size_t str_lsize(const char *str, count_t max_len) |
|
- | 245 | { |
|
- | 246 | count_t len = 0; |
|
- | 247 | size_t offset = 0; |
|
- | 248 | ||
- | 249 | while (len < max_len) { |
|
- | 250 | if (str_decode(str, &offset, STR_NO_LIMIT) == 0) |
|
- | 251 | break; |
|
- | 252 | ||
- | 253 | len++; |
|
- | 254 | } |
|
- | 255 | ||
- | 256 | return offset; |
|
- | 257 | } |
|
- | 258 | ||
- | 259 | /** Get size of wide string with length limit. |
|
- | 260 | * |
|
- | 261 | * Get the number of bytes which are used by up to @a max_len first |
|
- | 262 | * wide characters in the wide string @a str. If @a max_len is greater than |
|
- | 263 | * the length of @a str, the entire wide string is measured (excluding the |
|
- | 264 | * NULL-terminator). |
|
- | 265 | * |
|
- | 266 | * @param str Wide string to consider. |
|
- | 267 | * @param max_len Maximum number of wide characters to measure. |
|
- | 268 | * |
|
- | 269 | * @return Number of bytes used by the wide characters. |
|
- | 270 | * |
|
- | 271 | */ |
|
- | 272 | size_t wstr_lsize(const wchar_t *str, count_t max_len) |
|
- | 273 | { |
|
- | 274 | return (wstr_nlength(str, max_len * sizeof(wchar_t)) * sizeof(wchar_t)); |
|
- | 275 | } |
|
- | 276 | ||
- | 277 | /** Get number of characters in a string. |
|
- | 278 | * |
|
- | 279 | * @param str NULL-terminated string. |
|
- | 280 | * |
|
- | 281 | * @return Number of characters in string. |
|
- | 282 | * |
|
- | 283 | */ |
|
- | 284 | count_t str_length(const char *str) |
|
- | 285 | { |
|
- | 286 | count_t len = 0; |
|
- | 287 | size_t offset = 0; |
|
- | 288 | ||
- | 289 | while (str_decode(str, &offset, STR_NO_LIMIT) != 0) |
|
- | 290 | len++; |
|
- | 291 | ||
- | 292 | return len; |
|
- | 293 | } |
|
- | 294 | ||
- | 295 | /** Get number of characters in a wide string. |
|
- | 296 | * |
|
- | 297 | * @param str NULL-terminated wide string. |
|
- | 298 | * |
|
- | 299 | * @return Number of characters in @a str. |
|
- | 300 | * |
|
- | 301 | */ |
|
- | 302 | count_t wstr_length(const wchar_t *wstr) |
|
- | 303 | { |
|
- | 304 | count_t len = 0; |
|
- | 305 | ||
- | 306 | while (*wstr++ != 0) |
|
- | 307 | len++; |
|
- | 308 | ||
- | 309 | return len; |
|
- | 310 | } |
|
- | 311 | ||
- | 312 | /** Get number of characters in a string with size limit. |
|
- | 313 | * |
|
- | 314 | * @param str NULL-terminated string. |
|
- | 315 | * @param size Maximum number of bytes to consider. |
|
- | 316 | * |
|
- | 317 | * @return Number of characters in string. |
|
- | 318 | * |
|
- | 319 | */ |
|
- | 320 | count_t str_nlength(const char *str, size_t size) |
|
- | 321 | { |
|
- | 322 | count_t len = 0; |
|
- | 323 | size_t offset = 0; |
|
- | 324 | ||
- | 325 | while (str_decode(str, &offset, size) != 0) |
|
- | 326 | len++; |
|
- | 327 | ||
- | 328 | return len; |
|
- | 329 | } |
|
- | 330 | ||
- | 331 | /** Get number of characters in a string with size limit. |
|
- | 332 | * |
|
- | 333 | * @param str NULL-terminated string. |
|
- | 334 | * @param size Maximum number of bytes to consider. |
|
- | 335 | * |
|
- | 336 | * @return Number of characters in string. |
|
- | 337 | * |
|
- | 338 | */ |
|
- | 339 | count_t wstr_nlength(const wchar_t *str, size_t size) |
|
- | 340 | { |
|
- | 341 | count_t len = 0; |
|
- | 342 | count_t limit = ALIGN_DOWN(size, sizeof(wchar_t)); |
|
- | 343 | count_t offset = 0; |
|
- | 344 | ||
- | 345 | while ((offset < limit) && (*str++ != 0)) { |
|
- | 346 | len++; |
|
- | 347 | offset += sizeof(wchar_t); |
|
- | 348 | } |
|
- | 349 | ||
- | 350 | return len; |
|
- | 351 | } |
|
- | 352 | ||
- | 353 | /** Check whether character is plain ASCII. |
|
- | 354 | * |
|
- | 355 | * @return True if character is plain ASCII. |
|
- | 356 | * |
|
- | 357 | */ |
|
- | 358 | bool ascii_check(wchar_t ch) |
|
- | 359 | { |
|
- | 360 | if ((ch >= 0) && (ch <= 127)) |
|
- | 361 | return true; |
|
- | 362 | ||
- | 363 | return false; |
|
- | 364 | } |
|
- | 365 | ||
- | 366 | /** Check whether character is valid |
|
- | 367 | * |
|
- | 368 | * @return True if character is a valid Unicode code point. |
|
- | 369 | * |
|
- | 370 | */ |
|
- | 371 | bool chr_check(wchar_t ch) |
|
- | 372 | { |
|
- | 373 | if ((ch >= 0) && (ch <= 1114111)) |
|
- | 374 | return true; |
|
- | 375 | ||
- | 376 | return false; |
|
- | 377 | } |
|
- | 378 | ||
- | 379 | /** Compare two NULL terminated strings. |
|
- | 380 | * |
|
- | 381 | * Do a char-by-char comparison of two NULL-terminated strings. |
|
- | 382 | * The strings are considered equal iff they consist of the same |
|
- | 383 | * characters on the minimum of their lengths. |
|
- | 384 | * |
|
- | 385 | * @param s1 First string to compare. |
|
- | 386 | * @param s2 Second string to compare. |
|
- | 387 | * |
|
- | 388 | * @return 0 if the strings are equal, -1 if first is smaller, |
|
- | 389 | * 1 if second smaller. |
|
- | 390 | * |
|
- | 391 | */ |
|
- | 392 | int str_cmp(const char *s1, const char *s2) |
|
- | 393 | { |
|
- | 394 | wchar_t c1 = 0; |
|
- | 395 | wchar_t c2 = 0; |
|
- | 396 | ||
- | 397 | size_t off1 = 0; |
|
- | 398 | size_t off2 = 0; |
|
- | 399 | ||
- | 400 | while (true) { |
|
- | 401 | c1 = str_decode(s1, &off1, STR_NO_LIMIT); |
|
- | 402 | c2 = str_decode(s2, &off2, STR_NO_LIMIT); |
|
- | 403 | ||
- | 404 | if (c1 < c2) |
|
- | 405 | return -1; |
|
- | 406 | ||
- | 407 | if (c1 > c2) |
|
- | 408 | return 1; |
|
- | 409 | ||
- | 410 | if (c1 == 0 || c2 == 0) |
|
- | 411 | break; |
|
- | 412 | } |
|
- | 413 | ||
- | 414 | return 0; |
|
- | 415 | } |
|
- | 416 | ||
- | 417 | /** Compare two NULL terminated strings with length limit. |
|
- | 418 | * |
|
- | 419 | * Do a char-by-char comparison of two NULL-terminated strings. |
|
- | 420 | * The strings are considered equal iff they consist of the same |
|
- | 421 | * characters on the minimum of their lengths and the length limit. |
|
- | 422 | * |
|
- | 423 | * @param s1 First string to compare. |
|
- | 424 | * @param s2 Second string to compare. |
|
- | 425 | * @param max_len Maximum number of characters to consider. |
|
- | 426 | * |
|
- | 427 | * @return 0 if the strings are equal, -1 if first is smaller, |
|
- | 428 | * 1 if second smaller. |
|
- | 429 | * |
|
- | 430 | */ |
|
- | 431 | int str_lcmp(const char *s1, const char *s2, count_t max_len) |
|
- | 432 | { |
|
- | 433 | wchar_t c1 = 0; |
|
- | 434 | wchar_t c2 = 0; |
|
- | 435 | ||
- | 436 | size_t off1 = 0; |
|
- | 437 | size_t off2 = 0; |
|
- | 438 | ||
- | 439 | count_t len = 0; |
|
- | 440 | ||
- | 441 | while (true) { |
|
- | 442 | if (len >= max_len) |
|
- | 443 | break; |
|
- | 444 | ||
- | 445 | c1 = str_decode(s1, &off1, STR_NO_LIMIT); |
|
- | 446 | c2 = str_decode(s2, &off2, STR_NO_LIMIT); |
|
- | 447 | ||
- | 448 | if (c1 < c2) |
|
- | 449 | return -1; |
|
- | 450 | ||
- | 451 | if (c1 > c2) |
|
- | 452 | return 1; |
|
- | 453 | ||
- | 454 | if (c1 == 0 || c2 == 0) |
|
- | 455 | break; |
|
- | 456 | ||
- | 457 | ++len; |
|
- | 458 | } |
|
- | 459 | ||
- | 460 | return 0; |
|
- | 461 | ||
- | 462 | } |
|
- | 463 | ||
- | 464 | /** Copy NULL-terminated string. |
|
- | 465 | * |
|
- | 466 | * Copy source string @a src to destination buffer @a dst. |
|
- | 467 | * No more than @a size bytes are written. NULL-terminator is always |
|
- | 468 | * written after the last succesfully copied character (i.e. if the |
|
- | 469 | * destination buffer is has at least 1 byte, it will be always |
|
- | 470 | * NULL-terminated). |
|
- | 471 | * |
|
- | 472 | * @param src Source string. |
|
- | 473 | * @param dst Destination buffer. |
|
- | 474 | * @param count Size of the destination buffer. |
|
- | 475 | * |
|
- | 476 | */ |
|
- | 477 | void str_ncpy(char *dst, const char *src, size_t size) |
|
- | 478 | { |
|
- | 479 | /* No space for the NULL-terminator in the buffer */ |
|
- | 480 | if (size == 0) |
|
- | 481 | return; |
|
- | 482 | ||
- | 483 | wchar_t ch; |
|
- | 484 | size_t str_off = 0; |
|
- | 485 | size_t dst_off = 0; |
|
- | 486 | ||
- | 487 | while ((ch = str_decode(src, &str_off, STR_NO_LIMIT)) != 0) { |
|
- | 488 | if (chr_encode(ch, dst, &dst_off, size) != EOK) |
|
- | 489 | break; |
|
- | 490 | } |
|
- | 491 | ||
- | 492 | if (dst_off >= size) |
|
- | 493 | dst[size - 1] = 0; |
|
- | 494 | else |
|
- | 495 | dst[dst_off] = 0; |
|
- | 496 | } |
|
- | 497 | ||
- | 498 | /** Copy NULL-terminated wide string to string |
|
- | 499 | * |
|
- | 500 | * Copy source wide string @a src to destination buffer @a dst. |
|
- | 501 | * No more than @a size bytes are written. NULL-terminator is always |
|
- | 502 | * written after the last succesfully copied character (i.e. if the |
|
- | 503 | * destination buffer is has at least 1 byte, it will be always |
|
- | 504 | * NULL-terminated). |
|
- | 505 | * |
|
- | 506 | * @param src Source wide string. |
|
- | 507 | * @param dst Destination buffer. |
|
- | 508 | * @param count Size of the destination buffer. |
|
- | 509 | * |
|
- | 510 | */ |
|
- | 511 | void wstr_nstr(char *dst, const wchar_t *src, size_t size) |
|
- | 512 | { |
|
- | 513 | /* No space for the NULL-terminator in the buffer */ |
|
- | 514 | if (size == 0) |
|
- | 515 | return; |
|
- | 516 | ||
- | 517 | wchar_t ch; |
|
- | 518 | count_t src_idx = 0; |
|
- | 519 | size_t dst_off = 0; |
|
- | 520 | ||
- | 521 | while ((ch = src[src_idx++]) != 0) { |
|
- | 522 | if (chr_encode(ch, dst, &dst_off, size) != EOK) |
|
- | 523 | break; |
|
- | 524 | } |
|
- | 525 | ||
- | 526 | if (dst_off >= size) |
|
- | 527 | dst[size - 1] = 0; |
|
- | 528 | else |
|
- | 529 | dst[dst_off] = 0; |
|
- | 530 | } |
|
- | 531 | ||
- | 532 | /** Find first occurence of character in string. |
|
- | 533 | * |
|
- | 534 | * @param str String to search. |
|
- | 535 | * @param ch Character to look for. |
|
- | 536 | * |
|
- | 537 | * @return Pointer to character in @a str or NULL if not found. |
|
- | 538 | * |
|
- | 539 | */ |
|
- | 540 | const char *str_chr(const char *str, wchar_t ch) |
|
- | 541 | { |
|
- | 542 | wchar_t acc; |
|
- | 543 | size_t off = 0; |
|
- | 544 | ||
- | 545 | while ((acc = str_decode(str, &off, STR_NO_LIMIT)) != 0) { |
|
- | 546 | if (acc == ch) |
|
- | 547 | return (str + off); |
|
- | 548 | } |
|
- | 549 | ||
- | 550 | return NULL; |
|
- | 551 | } |
|
- | 552 | ||
- | 553 | /** Insert a wide character into a wide string. |
|
- | 554 | * |
|
- | 555 | * Insert a wide character into a wide string at position |
|
- | 556 | * @a pos. The characters after the position are shifted. |
|
- | 557 | * |
|
- | 558 | * @param str String to insert to. |
|
- | 559 | * @param ch Character to insert to. |
|
- | 560 | * @param pos Character index where to insert. |
|
- | 561 | @ @param max_pos Characters in the buffer. |
|
- | 562 | * |
|
- | 563 | * @return True if the insertion was sucessful, false if the position |
|
- | 564 | * is out of bounds. |
|
- | 565 | * |
|
- | 566 | */ |
|
- | 567 | bool wstr_linsert(wchar_t *str, wchar_t ch, count_t pos, count_t max_pos) |
|
- | 568 | { |
|
- | 569 | count_t len = wstr_length(str); |
|
- | 570 | ||
- | 571 | if ((pos > len) || (pos + 1 > max_pos)) |
|
- | 572 | return false; |
|
- | 573 | ||
- | 574 | count_t i; |
|
- | 575 | for (i = len; i + 1 > pos; i--) |
|
- | 576 | str[i + 1] = str[i]; |
|
- | 577 | ||
- | 578 | str[pos] = ch; |
|
- | 579 | ||
- | 580 | return true; |
|
- | 581 | } |
|
- | 582 | ||
- | 583 | /** Remove a wide character from a wide string. |
|
- | 584 | * |
|
- | 585 | * Remove a wide character from a wide string at position |
|
- | 586 | * @a pos. The characters after the position are shifted. |
|
- | 587 | * |
|
- | 588 | * @param str String to remove from. |
|
- | 589 | * @param pos Character index to remove. |
|
- | 590 | * |
|
- | 591 | * @return True if the removal was sucessful, false if the position |
|
- | 592 | * is out of bounds. |
|
- | 593 | * |
|
- | 594 | */ |
|
- | 595 | bool wstr_remove(wchar_t *str, count_t pos) |
|
- | 596 | { |
|
- | 597 | count_t len = wstr_length(str); |
|
- | 598 | ||
- | 599 | if (pos >= len) |
|
- | 600 | return false; |
|
- | 601 | ||
- | 602 | count_t i; |
|
- | 603 | for (i = pos + 1; i <= len; i++) |
|
- | 604 | str[i - 1] = str[i]; |
|
- | 605 | ||
- | 606 | return true; |
|
- | 607 | } |
|
41 | 608 | ||
42 | /** Count the number of characters in the string, not including terminating 0. |
609 | /** Count the number of characters in the string, not including terminating 0. |
43 | * |
610 | * |
44 | * @param str String. |
611 | * @param str String. |
45 | * @return Number of characters in string. |
612 | * @return Number of characters in string. |
46 | */ |
613 | */ |
47 | size_t strlen(const char *str) |
614 | size_t strlen(const char *str) |
48 | { |
615 | { |
49 | size_t counter = 0; |
616 | size_t counter = 0; |
50 | 617 | ||
51 | while (str[counter] != 0) |
618 | while (str[counter] != 0) |
52 | counter++; |
619 | counter++; |
53 | 620 | ||
54 | return counter; |
621 | return counter; |
55 | } |
622 | } |
56 | 623 | ||
57 | int strcmp(const char *a, const char *b) |
624 | int strcmp(const char *a, const char *b) |
58 | { |
625 | { |
59 | int c = 0; |
626 | int c = 0; |
60 | 627 | ||
61 | while (a[c] && b[c] && (!(a[c] - b[c]))) |
628 | while (a[c] && b[c] && (!(a[c] - b[c]))) |
62 | c++; |
629 | c++; |
63 | 630 | ||
64 | return (a[c] - b[c]); |
631 | return (a[c] - b[c]); |
65 | } |
632 | } |
66 | 633 | ||
67 | int strncmp(const char *a, const char *b, size_t n) |
634 | int strncmp(const char *a, const char *b, size_t n) |
68 | { |
635 | { |
69 | size_t c = 0; |
636 | size_t c = 0; |
70 | 637 | ||
71 | while (c < n && a[c] && b[c] && (!(a[c] - b[c]))) |
638 | while (c < n && a[c] && b[c] && (!(a[c] - b[c]))) |
72 | c++; |
639 | c++; |
73 | 640 | ||
74 | return ( c < n ? a[c] - b[c] : 0); |
641 | return ( c < n ? a[c] - b[c] : 0); |
75 | 642 | ||
76 | } |
643 | } |
77 | 644 | ||
78 | int stricmp(const char *a, const char *b) |
645 | int stricmp(const char *a, const char *b) |
79 | { |
646 | { |
80 | int c = 0; |
647 | int c = 0; |
81 | 648 | ||
82 | while (a[c] && b[c] && (!(tolower(a[c]) - tolower(b[c])))) |
649 | while (a[c] && b[c] && (!(tolower(a[c]) - tolower(b[c])))) |
83 | c++; |
650 | c++; |
84 | 651 | ||
85 | return (tolower(a[c]) - tolower(b[c])); |
652 | return (tolower(a[c]) - tolower(b[c])); |
86 | } |
653 | } |
87 | 654 | ||
88 | /** Return pointer to the first occurence of character c in string. |
655 | /** Return pointer to the first occurence of character c in string. |
89 | * |
656 | * |
90 | * @param str Scanned string. |
657 | * @param str Scanned string. |
91 | * @param c Searched character (taken as one byte). |
658 | * @param c Searched character (taken as one byte). |
92 | * @return Pointer to the matched character or NULL if it is not |
659 | * @return Pointer to the matched character or NULL if it is not |
93 | * found in given string. |
660 | * found in given string. |
94 | */ |
661 | */ |
95 | char *strchr(const char *str, int c) |
662 | char *strchr(const char *str, int c) |
96 | { |
663 | { |
97 | while (*str != '\0') { |
664 | while (*str != '\0') { |
98 | if (*str == (char) c) |
665 | if (*str == (char) c) |
99 | return (char *) str; |
666 | return (char *) str; |
100 | str++; |
667 | str++; |
101 | } |
668 | } |
102 | 669 | ||
103 | return NULL; |
670 | return NULL; |
104 | } |
671 | } |
105 | 672 | ||
106 | /** Return pointer to the last occurence of character c in string. |
673 | /** Return pointer to the last occurence of character c in string. |
107 | * |
674 | * |
108 | * @param str Scanned string. |
675 | * @param str Scanned string. |
109 | * @param c Searched character (taken as one byte). |
676 | * @param c Searched character (taken as one byte). |
110 | * @return Pointer to the matched character or NULL if it is not |
677 | * @return Pointer to the matched character or NULL if it is not |
111 | * found in given string. |
678 | * found in given string. |
112 | */ |
679 | */ |
113 | char *strrchr(const char *str, int c) |
680 | char *strrchr(const char *str, int c) |
114 | { |
681 | { |
115 | char *retval = NULL; |
682 | char *retval = NULL; |
116 | 683 | ||
117 | while (*str != '\0') { |
684 | while (*str != '\0') { |
118 | if (*str == (char) c) |
685 | if (*str == (char) c) |
119 | retval = (char *) str; |
686 | retval = (char *) str; |
120 | str++; |
687 | str++; |
121 | } |
688 | } |
122 | 689 | ||
123 | return (char *) retval; |
690 | return (char *) retval; |
124 | } |
691 | } |
125 | 692 | ||
126 | /** Convert string to a number. |
693 | /** Convert string to a number. |
127 | * Core of strtol and strtoul functions. |
694 | * Core of strtol and strtoul functions. |
128 | * |
695 | * |
129 | * @param nptr Pointer to string. |
696 | * @param nptr Pointer to string. |
130 | * @param endptr If not NULL, function stores here pointer to the first |
697 | * @param endptr If not NULL, function stores here pointer to the first |
131 | * invalid character. |
698 | * invalid character. |
132 | * @param base Zero or number between 2 and 36 inclusive. |
699 | * @param base Zero or number between 2 and 36 inclusive. |
133 | * @param sgn It's set to 1 if minus found. |
700 | * @param sgn It's set to 1 if minus found. |
134 | * @return Result of conversion. |
701 | * @return Result of conversion. |
135 | */ |
702 | */ |
136 | static unsigned long |
703 | static unsigned long |
137 | _strtoul(const char *nptr, char **endptr, int base, char *sgn) |
704 | _strtoul(const char *nptr, char **endptr, int base, char *sgn) |
138 | { |
705 | { |
139 | unsigned char c; |
706 | unsigned char c; |
140 | unsigned long result = 0; |
707 | unsigned long result = 0; |
141 | unsigned long a, b; |
708 | unsigned long a, b; |
142 | const char *str = nptr; |
709 | const char *str = nptr; |
143 | const char *tmpptr; |
710 | const char *tmpptr; |
144 | 711 | ||
145 | while (isspace(*str)) |
712 | while (isspace(*str)) |
146 | str++; |
713 | str++; |
147 | 714 | ||
148 | if (*str == '-') { |
715 | if (*str == '-') { |
149 | *sgn = 1; |
716 | *sgn = 1; |
150 | ++str; |
717 | ++str; |
151 | } else if (*str == '+') |
718 | } else if (*str == '+') |
152 | ++str; |
719 | ++str; |
153 | 720 | ||
154 | if (base) { |
721 | if (base) { |
155 | if ((base == 1) || (base > 36)) { |
722 | if ((base == 1) || (base > 36)) { |
156 | /* FIXME: set errno to EINVAL */ |
723 | /* FIXME: set errno to EINVAL */ |
157 | return 0; |
724 | return 0; |
158 | } |
725 | } |
159 | if ((base == 16) && (*str == '0') && ((str[1] == 'x') || |
726 | if ((base == 16) && (*str == '0') && ((str[1] == 'x') || |
160 | (str[1] == 'X'))) { |
727 | (str[1] == 'X'))) { |
161 | str += 2; |
728 | str += 2; |
162 | } |
729 | } |
163 | } else { |
730 | } else { |
164 | base = 10; |
731 | base = 10; |
165 | 732 | ||
166 | if (*str == '0') { |
733 | if (*str == '0') { |
167 | base = 8; |
734 | base = 8; |
168 | if ((str[1] == 'X') || (str[1] == 'x')) { |
735 | if ((str[1] == 'X') || (str[1] == 'x')) { |
169 | base = 16; |
736 | base = 16; |
170 | str += 2; |
737 | str += 2; |
171 | } |
738 | } |
172 | } |
739 | } |
173 | } |
740 | } |
174 | 741 | ||
175 | tmpptr = str; |
742 | tmpptr = str; |
176 | 743 | ||
177 | while (*str) { |
744 | while (*str) { |
178 | c = *str; |
745 | c = *str; |
179 | c = (c >= 'a' ? c - 'a' + 10 : (c >= 'A' ? c - 'A' + 10 : |
746 | c = (c >= 'a' ? c - 'a' + 10 : (c >= 'A' ? c - 'A' + 10 : |
180 | (c <= '9' ? c - '0' : 0xff))); |
747 | (c <= '9' ? c - '0' : 0xff))); |
181 | if (c > base) { |
748 | if (c > base) { |
182 | break; |
749 | break; |
183 | } |
750 | } |
184 | 751 | ||
185 | a = (result & 0xff) * base + c; |
752 | a = (result & 0xff) * base + c; |
186 | b = (result >> 8) * base + (a >> 8); |
753 | b = (result >> 8) * base + (a >> 8); |
187 | 754 | ||
188 | if (b > (ULONG_MAX >> 8)) { |
755 | if (b > (ULONG_MAX >> 8)) { |
189 | /* overflow */ |
756 | /* overflow */ |
190 | /* FIXME: errno = ERANGE*/ |
757 | /* FIXME: errno = ERANGE*/ |
191 | return ULONG_MAX; |
758 | return ULONG_MAX; |
192 | } |
759 | } |
193 | 760 | ||
194 | result = (b << 8) + (a & 0xff); |
761 | result = (b << 8) + (a & 0xff); |
195 | ++str; |
762 | ++str; |
196 | } |
763 | } |
197 | 764 | ||
198 | if (str == tmpptr) { |
765 | if (str == tmpptr) { |
199 | /* |
766 | /* |
200 | * No number was found => first invalid character is the first |
767 | * No number was found => first invalid character is the first |
201 | * character of the string. |
768 | * character of the string. |
202 | */ |
769 | */ |
203 | /* FIXME: set errno to EINVAL */ |
770 | /* FIXME: set errno to EINVAL */ |
204 | str = nptr; |
771 | str = nptr; |
205 | result = 0; |
772 | result = 0; |
206 | } |
773 | } |
207 | 774 | ||
208 | if (endptr) |
775 | if (endptr) |
209 | *endptr = (char *) str; |
776 | *endptr = (char *) str; |
210 | 777 | ||
211 | if (nptr == str) { |
778 | if (nptr == str) { |
212 | /*FIXME: errno = EINVAL*/ |
779 | /*FIXME: errno = EINVAL*/ |
213 | return 0; |
780 | return 0; |
214 | } |
781 | } |
215 | 782 | ||
216 | return result; |
783 | return result; |
217 | } |
784 | } |
218 | 785 | ||
219 | /** Convert initial part of string to long int according to given base. |
786 | /** Convert initial part of string to long int according to given base. |
220 | * The number may begin with an arbitrary number of whitespaces followed by |
787 | * The number may begin with an arbitrary number of whitespaces followed by |
221 | * optional sign (`+' or `-'). If the base is 0 or 16, the prefix `0x' may be |
788 | * optional sign (`+' or `-'). If the base is 0 or 16, the prefix `0x' may be |
222 | * inserted and the number will be taken as hexadecimal one. If the base is 0 |
789 | * inserted and the number will be taken as hexadecimal one. If the base is 0 |
223 | * and the number begin with a zero, number will be taken as octal one (as with |
790 | * and the number begin with a zero, number will be taken as octal one (as with |
224 | * base 8). Otherwise the base 0 is taken as decimal. |
791 | * base 8). Otherwise the base 0 is taken as decimal. |
225 | * |
792 | * |
226 | * @param nptr Pointer to string. |
793 | * @param nptr Pointer to string. |
227 | * @param endptr If not NULL, function stores here pointer to the first |
794 | * @param endptr If not NULL, function stores here pointer to the first |
228 | * invalid character. |
795 | * invalid character. |
229 | * @param base Zero or number between 2 and 36 inclusive. |
796 | * @param base Zero or number between 2 and 36 inclusive. |
230 | * @return Result of conversion. |
797 | * @return Result of conversion. |
231 | */ |
798 | */ |
232 | long int strtol(const char *nptr, char **endptr, int base) |
799 | long int strtol(const char *nptr, char **endptr, int base) |
233 | { |
800 | { |
234 | char sgn = 0; |
801 | char sgn = 0; |
235 | unsigned long number = 0; |
802 | unsigned long number = 0; |
236 | 803 | ||
237 | number = _strtoul(nptr, endptr, base, &sgn); |
804 | number = _strtoul(nptr, endptr, base, &sgn); |
238 | 805 | ||
239 | if (number > LONG_MAX) { |
806 | if (number > LONG_MAX) { |
240 | if ((sgn) && (number == (unsigned long) (LONG_MAX) + 1)) { |
807 | if ((sgn) && (number == (unsigned long) (LONG_MAX) + 1)) { |
241 | /* FIXME: set 0 to errno */ |
808 | /* FIXME: set 0 to errno */ |
242 | return number; |
809 | return number; |
243 | } |
810 | } |
244 | /* FIXME: set ERANGE to errno */ |
811 | /* FIXME: set ERANGE to errno */ |
245 | return (sgn ? LONG_MIN : LONG_MAX); |
812 | return (sgn ? LONG_MIN : LONG_MAX); |
246 | } |
813 | } |
247 | 814 | ||
248 | return (sgn ? -number : number); |
815 | return (sgn ? -number : number); |
249 | } |
816 | } |
250 | 817 | ||
251 | 818 | ||
252 | /** Convert initial part of string to unsigned long according to given base. |
819 | /** Convert initial part of string to unsigned long according to given base. |
253 | * The number may begin with an arbitrary number of whitespaces followed by |
820 | * The number may begin with an arbitrary number of whitespaces followed by |
254 | * optional sign (`+' or `-'). If the base is 0 or 16, the prefix `0x' may be |
821 | * optional sign (`+' or `-'). If the base is 0 or 16, the prefix `0x' may be |
255 | * inserted and the number will be taken as hexadecimal one. If the base is 0 |
822 | * inserted and the number will be taken as hexadecimal one. If the base is 0 |
256 | * and the number begin with a zero, number will be taken as octal one (as with |
823 | * and the number begin with a zero, number will be taken as octal one (as with |
257 | * base 8). Otherwise the base 0 is taken as decimal. |
824 | * base 8). Otherwise the base 0 is taken as decimal. |
258 | * |
825 | * |
259 | * @param nptr Pointer to string. |
826 | * @param nptr Pointer to string. |
260 | * @param endptr If not NULL, function stores here pointer to the first |
827 | * @param endptr If not NULL, function stores here pointer to the first |
261 | * invalid character |
828 | * invalid character |
262 | * @param base Zero or number between 2 and 36 inclusive. |
829 | * @param base Zero or number between 2 and 36 inclusive. |
263 | * @return Result of conversion. |
830 | * @return Result of conversion. |
264 | */ |
831 | */ |
265 | unsigned long strtoul(const char *nptr, char **endptr, int base) |
832 | unsigned long strtoul(const char *nptr, char **endptr, int base) |
266 | { |
833 | { |
267 | char sgn = 0; |
834 | char sgn = 0; |
268 | unsigned long number = 0; |
835 | unsigned long number = 0; |
269 | 836 | ||
270 | number = _strtoul(nptr, endptr, base, &sgn); |
837 | number = _strtoul(nptr, endptr, base, &sgn); |
271 | 838 | ||
272 | return (sgn ? -number : number); |
839 | return (sgn ? -number : number); |
273 | } |
840 | } |
274 | 841 | ||
275 | char *strcpy(char *dest, const char *src) |
842 | char *strcpy(char *dest, const char *src) |
276 | { |
843 | { |
277 | char *orig = dest; |
844 | char *orig = dest; |
278 | 845 | ||
279 | while ((*(dest++) = *(src++))) |
846 | while ((*(dest++) = *(src++))) |
280 | ; |
847 | ; |
281 | return orig; |
848 | return orig; |
282 | } |
849 | } |
283 | 850 | ||
284 | char *strncpy(char *dest, const char *src, size_t n) |
851 | char *strncpy(char *dest, const char *src, size_t n) |
285 | { |
852 | { |
286 | char *orig = dest; |
853 | char *orig = dest; |
287 | 854 | ||
288 | while ((*(dest++) = *(src++)) && --n) |
855 | while ((*(dest++) = *(src++)) && --n) |
289 | ; |
856 | ; |
290 | return orig; |
857 | return orig; |
291 | } |
858 | } |
292 | 859 | ||
293 | char *strcat(char *dest, const char *src) |
860 | char *strcat(char *dest, const char *src) |
294 | { |
861 | { |
295 | char *orig = dest; |
862 | char *orig = dest; |
296 | while (*dest++) |
863 | while (*dest++) |
297 | ; |
864 | ; |
298 | --dest; |
865 | --dest; |
299 | while ((*dest++ = *src++)) |
866 | while ((*dest++ = *src++)) |
300 | ; |
867 | ; |
301 | return orig; |
868 | return orig; |
302 | } |
869 | } |
303 | 870 | ||
304 | char * strdup(const char *s1) |
871 | char * strdup(const char *s1) |
305 | { |
872 | { |
306 | size_t len = strlen(s1) + 1; |
873 | size_t len = strlen(s1) + 1; |
307 | void *ret = malloc(len); |
874 | void *ret = malloc(len); |
308 | 875 | ||
309 | if (ret == NULL) |
876 | if (ret == NULL) |
310 | return (char *) NULL; |
877 | return (char *) NULL; |
311 | 878 | ||
312 | return (char *) memcpy(ret, s1, len); |
879 | return (char *) memcpy(ret, s1, len); |
313 | } |
880 | } |
314 | 881 | ||
315 | char *strtok(char *s, const char *delim) |
882 | char *strtok(char *s, const char *delim) |
316 | { |
883 | { |
317 | static char *next; |
884 | static char *next; |
318 | 885 | ||
319 | return strtok_r(s, delim, &next); |
886 | return strtok_r(s, delim, &next); |
320 | } |
887 | } |
321 | 888 | ||
322 | char *strtok_r(char *s, const char *delim, char **next) |
889 | char *strtok_r(char *s, const char *delim, char **next) |
323 | { |
890 | { |
324 | char *start, *end; |
891 | char *start, *end; |
325 | 892 | ||
326 | if (s == NULL) |
893 | if (s == NULL) |
327 | s = *next; |
894 | s = *next; |
328 | 895 | ||
329 | /* Skip over leading delimiters. */ |
896 | /* Skip over leading delimiters. */ |
330 | while (*s && (strchr(delim, *s) != NULL)) ++s; |
897 | while (*s && (strchr(delim, *s) != NULL)) ++s; |
331 | start = s; |
898 | start = s; |
332 | 899 | ||
333 | /* Skip over token characters. */ |
900 | /* Skip over token characters. */ |
334 | while (*s && (strchr(delim, *s) == NULL)) ++s; |
901 | while (*s && (strchr(delim, *s) == NULL)) ++s; |
335 | end = s; |
902 | end = s; |
336 | *next = (*s ? s + 1 : s); |
903 | *next = (*s ? s + 1 : s); |
337 | 904 | ||
338 | if (start == end) { |
905 | if (start == end) { |
339 | return NULL; /* No more tokens. */ |
906 | return NULL; /* No more tokens. */ |
340 | } |
907 | } |
341 | 908 | ||
342 | /* Overwrite delimiter with NULL terminator. */ |
909 | /* Overwrite delimiter with NULL terminator. */ |
343 | *end = '\0'; |
910 | *end = '\0'; |
344 | return start; |
911 | return start; |
345 | } |
912 | } |
346 | 913 | ||
347 | /** @} |
914 | /** @} |
348 | */ |
915 | */ |
349 | 916 |