| 1 | /*␊ |
| 2 | * Copyright (c) 1999-2003 Apple Computer, Inc. All rights reserved.␊ |
| 3 | *␊ |
| 4 | * @APPLE_LICENSE_HEADER_START@␊ |
| 5 | * ␊ |
| 6 | * Portions Copyright (c) 1999-2003 Apple Computer, Inc. All Rights␊ |
| 7 | * Reserved. This file contains Original Code and/or Modifications of␊ |
| 8 | * Original Code as defined in and that are subject to the Apple Public␊ |
| 9 | * Source License Version 2.0 (the "License"). You may not use this file␊ |
| 10 | * except in compliance with the License. Please obtain a copy of the␊ |
| 11 | * License at http://www.apple.com/publicsource and read it before using␊ |
| 12 | * this file.␊ |
| 13 | * ␊ |
| 14 | * The Original Code and all software distributed under the License are␊ |
| 15 | * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER␊ |
| 16 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,␊ |
| 17 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,␊ |
| 18 | * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT. Please see the␊ |
| 19 | * License for the specific language governing rights and limitations␊ |
| 20 | * under the License.␊ |
| 21 | * ␊ |
| 22 | * @APPLE_LICENSE_HEADER_END@␊ |
| 23 | */␊ |
| 24 | /* string operations */␊ |
| 25 | ␊ |
| 26 | #include "libsa.h"␊ |
| 27 | ␊ |
| 28 | static int _mach_strlen(const char *str);␊ |
| 29 | static char *STRDUP(const char *string);␊ |
| 30 | ␊ |
| 31 | /*␊ |
| 32 | * Abstract:␊ |
| 33 | * strcmp (s1, s2) compares the strings "s1" and "s2".␊ |
| 34 | * It returns 0 if the strings are identical. It returns␊ |
| 35 | * > 0 if the first character that differs in the two strings␊ |
| 36 | * is larger in s1 than in s2 or if s1 is longer than s2 and␊ |
| 37 | * the contents are identical up to the length of s2.␊ |
| 38 | * It returns < 0 if the first differing character is smaller␊ |
| 39 | * in s1 than in s2 or if s1 is shorter than s2 and the␊ |
| 40 | * contents are identical upto the length of s1.␊ |
| 41 | * Deprecation Warning:␊ |
| 42 | *␉strcmp() is being deprecated. Please use strncmp() instead.␊ |
| 43 | */␊ |
| 44 | ␊ |
| 45 | int␊ |
| 46 | strcmp(␊ |
| 47 | ␉ const char *s1,␊ |
| 48 | ␉ const char *s2)␊ |
| 49 | {␊ |
| 50 | ␉unsigned int a, b;␊ |
| 51 | ␉␊ |
| 52 | ␉do {␊ |
| 53 | ␉␉a = *s1++;␊ |
| 54 | ␉␉b = *s2++;␊ |
| 55 | ␉␉if (a != b)␊ |
| 56 | ␉␉␉return a-b; /* includes case when␊ |
| 57 | ␉␉␉␉␉␉␉ 'a' is zero and 'b' is not zero␊ |
| 58 | ␉␉␉␉␉␉␉ or vice versa */␊ |
| 59 | ␉} while (a != '\0');␊ |
| 60 | ␉␊ |
| 61 | ␉return 0; /* both are zero */␊ |
| 62 | }␊ |
| 63 | ␊ |
| 64 | /*␊ |
| 65 | * Abstract:␊ |
| 66 | * strncmp (s1, s2, n) compares the strings "s1" and "s2"␊ |
| 67 | * in exactly the same way as strcmp does. Except the␊ |
| 68 | * comparison runs for at most "n" characters.␊ |
| 69 | */␊ |
| 70 | ␊ |
| 71 | int␊ |
| 72 | strncmp(␊ |
| 73 | const char *s1,␊ |
| 74 | const char *s2,␊ |
| 75 | size_t n)␊ |
| 76 | {␊ |
| 77 | ␉unsigned int a, b;␊ |
| 78 | ␉␊ |
| 79 | ␉while (n != 0) {␊ |
| 80 | ␉␉a = *s1++;␊ |
| 81 | ␉␉b = *s2++;␊ |
| 82 | ␉␉if (a != b)␊ |
| 83 | ␉␉␉return a-b; /* includes case when␊ |
| 84 | ␉␉␉␉␉␉␉ 'a' is zero and 'b' is not zero␊ |
| 85 | ␉␉␉␉␉␉␉ or vice versa */␊ |
| 86 | ␉␉if (a == '\0')␊ |
| 87 | ␉␉␉return 0; /* both are zero */␊ |
| 88 | ␉␉n--;␊ |
| 89 | ␉}␊ |
| 90 | ␉␊ |
| 91 | ␉return 0;␊ |
| 92 | }␊ |
| 93 | ␊ |
| 94 | ␊ |
| 95 | /*␊ |
| 96 | * Abstract:␊ |
| 97 | * strcpy copies the contents of the string "from" including␊ |
| 98 | * the null terminator to the string "to". A pointer to "to"␊ |
| 99 | * is returned.␊ |
| 100 | * Deprecation Warning: ␊ |
| 101 | *␉strcpy() is being deprecated. Please use strlcpy() instead.␊ |
| 102 | */␊ |
| 103 | char *␊ |
| 104 | strcpy(␊ |
| 105 | ␉ char *to,␊ |
| 106 | ␉ const char *from)␊ |
| 107 | {␊ |
| 108 | ␉char *ret = to;␊ |
| 109 | ␉␊ |
| 110 | ␉while ((*to++ = *from++) != '\0')␊ |
| 111 | ␉␉continue;␊ |
| 112 | ␉␊ |
| 113 | ␉return ret;␊ |
| 114 | }␊ |
| 115 | ␊ |
| 116 | /*␊ |
| 117 | * Abstract:␊ |
| 118 | * strncpy copies "count" characters from the "from" string to␊ |
| 119 | * the "to" string. If "from" contains less than "count" characters␊ |
| 120 | * "to" will be padded with null characters until exactly "count"␊ |
| 121 | * characters have been written. The return value is a pointer␊ |
| 122 | * to the "to" string.␊ |
| 123 | */␊ |
| 124 | ␊ |
| 125 | char *␊ |
| 126 | strncpy(␊ |
| 127 | ␉␉char *s1, ␊ |
| 128 | ␉␉const char *s2,␊ |
| 129 | ␉␉size_t n)␊ |
| 130 | {␊ |
| 131 | ␉char *os1 = s1;␊ |
| 132 | ␉unsigned long i;␊ |
| 133 | ␉␊ |
| 134 | ␉for (i = 0; i < n;)␊ |
| 135 | ␉␉if ((*s1++ = *s2++) == '\0')␊ |
| 136 | ␉␉␉for (i++; i < n; i++)␊ |
| 137 | ␉␉␉␉*s1++ = '\0';␊ |
| 138 | ␉␉else␊ |
| 139 | ␉␉␉i++;␊ |
| 140 | ␉return (os1);␊ |
| 141 | }␊ |
| 142 | ␊ |
| 143 | /*␊ |
| 144 | * Copy src to string dst of size siz. At most siz-1 characters␊ |
| 145 | * will be copied. Always NUL terminates (unless siz == 0).␊ |
| 146 | * Returns strlen(src); if retval >= siz, truncation occurred.␊ |
| 147 | */␊ |
| 148 | size_t␊ |
| 149 | strlcpy(char *dst, const char *src, size_t siz)␊ |
| 150 | {␊ |
| 151 | ␉char *d = dst;␊ |
| 152 | ␉const char *s = src;␊ |
| 153 | ␉size_t n = siz;␊ |
| 154 | ␉␊ |
| 155 | ␉/* Copy as many bytes as will fit */␊ |
| 156 | ␉if (n != 0 && --n != 0) {␊ |
| 157 | ␉␉do {␊ |
| 158 | ␉␉␉if ((*d++ = *s++) == 0)␊ |
| 159 | ␉␉␉␉break;␊ |
| 160 | ␉␉} while (--n != 0);␊ |
| 161 | ␉}␊ |
| 162 | ␉␊ |
| 163 | ␉/* Not enough room in dst, add NUL and traverse rest of src */␊ |
| 164 | ␉if (n == 0) {␊ |
| 165 | ␉␉if (siz != 0)␊ |
| 166 | ␉␉␉*d = '\0';␉␉/* NUL-terminate dst */␊ |
| 167 | ␉␉while (*s++)␊ |
| 168 | ␉␉␉;␊ |
| 169 | ␉}␊ |
| 170 | ␉␊ |
| 171 | ␉return(s - src - 1);␉/* count does not include NUL */␊ |
| 172 | }␊ |
| 173 | ␊ |
| 174 | /*␊ |
| 175 | * History:␊ |
| 176 | * 2002-01-24 ␉gvdl␉Initial implementation of strstr␊ |
| 177 | */␊ |
| 178 | ␊ |
| 179 | const char *␊ |
| 180 | strstr(const char *in, const char *str)␊ |
| 181 | {␊ |
| 182 | char c;␊ |
| 183 | size_t len;␊ |
| 184 | ␉␊ |
| 185 | c = *str++;␊ |
| 186 | if (!c)␊ |
| 187 | return (const char *) in;␉// Trivial empty string case␊ |
| 188 | ␉␊ |
| 189 | len = strlen(str);␊ |
| 190 | do {␊ |
| 191 | char sc;␊ |
| 192 | ␉␉␊ |
| 193 | do {␊ |
| 194 | sc = *in++;␊ |
| 195 | if (!sc)␊ |
| 196 | return (char *) 0;␊ |
| 197 | } while (sc != c);␊ |
| 198 | } while (strncmp(in, str, len) != 0);␊ |
| 199 | ␉␊ |
| 200 | return (const char *) (in - 1);␊ |
| 201 | }␊ |
| 202 | ␊ |
| 203 | void *␊ |
| 204 | memmove(void *dst, const void *src, size_t ulen)␊ |
| 205 | {␊ |
| 206 | bcopy(src, dst, ulen); ␊ |
| 207 | return dst;␊ |
| 208 | }␊ |
| 209 | #if UNUSED␊ |
| 210 | int␊ |
| 211 | ptol(const char *str)␊ |
| 212 | {␊ |
| 213 | ␉register int c = *str;␊ |
| 214 | ␉␊ |
| 215 | ␉if (c <= '7' && c >= '0')␊ |
| 216 | ␉␉c -= '0';␊ |
| 217 | ␉else if (c <= 'h' && c >= 'a')␊ |
| 218 | ␉␉c -= 'a';␊ |
| 219 | ␉else c = 0;␊ |
| 220 | ␉return c;␊ |
| 221 | }␊ |
| 222 | #endif␊ |
| 223 | /*␊ |
| 224 | * atoi:␊ |
| 225 | *␊ |
| 226 | * This function converts an ascii string into an integer.␊ |
| 227 | *␊ |
| 228 | * input : string␊ |
| 229 | * output : a number␊ |
| 230 | */␊ |
| 231 | ␊ |
| 232 | int␊ |
| 233 | atoi(const char *cp)␊ |
| 234 | {␊ |
| 235 | ␉int number;␊ |
| 236 | ␉␊ |
| 237 | ␉for (number = 0; ('0' <= *cp) && (*cp <= '9'); cp++)␊ |
| 238 | ␉␉number = (number * 10) + (*cp - '0');␊ |
| 239 | ␉␊ |
| 240 | ␉return( number );␊ |
| 241 | }␊ |
| 242 | #if UNUSED␊ |
| 243 | /*␊ |
| 244 | * convert an integer to an ASCII string.␊ |
| 245 | * inputs:␊ |
| 246 | *␉num␉integer to be converted␊ |
| 247 | *␉str␉string pointer.␊ |
| 248 | *␊ |
| 249 | * outputs:␊ |
| 250 | *␉pointer to string start.␊ |
| 251 | */␊ |
| 252 | ␊ |
| 253 | char *␊ |
| 254 | itoa(␊ |
| 255 | ␉ int␉num,␊ |
| 256 | ␉ char␉*str)␊ |
| 257 | {␊ |
| 258 | ␉char digits[11];␊ |
| 259 | ␉char *dp;␊ |
| 260 | ␉char *cp = str;␊ |
| 261 | ␉␊ |
| 262 | ␉if (num == 0) {␊ |
| 263 | ␉␉*cp++ = '0';␊ |
| 264 | ␉}␊ |
| 265 | ␉else {␊ |
| 266 | ␉␉dp = digits;␊ |
| 267 | ␉␉while (num) {␊ |
| 268 | ␉␉␉*dp++ = '0' + num % 10;␊ |
| 269 | ␉␉␉num /= 10;␊ |
| 270 | ␉␉}␊ |
| 271 | ␉␉while (dp != digits) {␊ |
| 272 | ␉␉␉*cp++ = *--dp;␊ |
| 273 | ␉␉}␊ |
| 274 | ␉}␊ |
| 275 | ␉*cp++ = '\0';␊ |
| 276 | ␉␊ |
| 277 | ␉return str;␊ |
| 278 | }␊ |
| 279 | #endif␊ |
| 280 | /*␊ |
| 281 | * Appends src to string dst of size siz (unlike strncat, siz is the␊ |
| 282 | * full size of dst, not space left). At most siz-1 characters␊ |
| 283 | * will be copied. Always NUL terminates (unless siz <= strlen(dst)).␊ |
| 284 | * Returns strlen(src) + MIN(siz, strlen(initial dst)).␊ |
| 285 | * If retval >= siz, truncation occurred.␊ |
| 286 | */␊ |
| 287 | size_t␊ |
| 288 | strlcat(char *dst, const char *src, size_t siz)␊ |
| 289 | {␊ |
| 290 | ␉char *d = dst;␊ |
| 291 | ␉const char *s = src;␊ |
| 292 | ␉size_t n = siz;␊ |
| 293 | ␉size_t dlen;␊ |
| 294 | ␉␊ |
| 295 | ␉/* Find the end of dst and adjust bytes left but don't go past end */␊ |
| 296 | ␉while (n-- != 0 && *d != '\0')␊ |
| 297 | ␉␉d++;␊ |
| 298 | ␉dlen = d - dst;␊ |
| 299 | ␉n = siz - dlen;␊ |
| 300 | ␉␊ |
| 301 | ␉if (n == 0)␊ |
| 302 | ␉␉return(dlen + strlen(s));␊ |
| 303 | ␉while (*s != '\0') {␊ |
| 304 | ␉␉if (n != 1) {␊ |
| 305 | ␉␉␉*d++ = *s;␊ |
| 306 | ␉␉␉n--;␊ |
| 307 | ␉␉}␊ |
| 308 | ␉␉s++;␊ |
| 309 | ␉}␊ |
| 310 | ␉*d = '\0';␊ |
| 311 | ␉␊ |
| 312 | ␉return(dlen + (s - src)); /* count does not include NUL */␊ |
| 313 | }␊ |
| 314 | ␊ |
| 315 | /*␊ |
| 316 | *␊ |
| 317 | */␊ |
| 318 | ␊ |
| 319 | char *␊ |
| 320 | strncat(char *s1, const char *s2, unsigned long n)␊ |
| 321 | {␊ |
| 322 | ␉char *os1;␊ |
| 323 | ␉int i = n;␊ |
| 324 | ␉␊ |
| 325 | ␉os1 = s1;␊ |
| 326 | ␉while (*s1++)␊ |
| 327 | ␉␉;␊ |
| 328 | ␉--s1;␊ |
| 329 | ␉while ((*s1++ = *s2++))␊ |
| 330 | ␉␉if (--i < 0) {␊ |
| 331 | ␉␉␉*--s1 = '\0';␊ |
| 332 | ␉␉␉break;␊ |
| 333 | ␉␉}␊ |
| 334 | ␉return(os1);␊ |
| 335 | }␊ |
| 336 | ␊ |
| 337 | static int␊ |
| 338 | _mach_strlen(const char *str)␊ |
| 339 | {␊ |
| 340 | ␉const char *p;␊ |
| 341 | ␉for (p = str; p; p++) {␊ |
| 342 | ␉␉if (*p == '\0') {␊ |
| 343 | ␉␉␉return (p - str);␊ |
| 344 | ␉␉}␊ |
| 345 | ␉}␊ |
| 346 | ␉/* NOTREACHED */␊ |
| 347 | ␉return 0;␊ |
| 348 | }␊ |
| 349 | ␊ |
| 350 | size_t strlen(const char * str)␊ |
| 351 | {␉␊ |
| 352 | ␉return (size_t)_mach_strlen(str);␊ |
| 353 | }␊ |
| 354 | #if UNUSED␊ |
| 355 | /*␊ |
| 356 | * Does the same thing as strlen, except only looks up␊ |
| 357 | * to max chars inside the buffer. ␊ |
| 358 | * Taken from archive/kern-stuff/sbf_machine.c in ␊ |
| 359 | * seatbelt. ␊ |
| 360 | * inputs:␊ |
| 361 | * ␉s␉string whose length is to be measured␊ |
| 362 | *␉max␉maximum length of string to search for null␊ |
| 363 | * outputs:␊ |
| 364 | *␉length of s or max; whichever is smaller␊ |
| 365 | */␊ |
| 366 | size_t ␊ |
| 367 | strnlen(const char *s, size_t max) {␊ |
| 368 | ␉const char *es = s + max, *p = s;␊ |
| 369 | ␉while(*p && p != es) ␊ |
| 370 | ␉␉p++;␊ |
| 371 | ␉␊ |
| 372 | ␉return p - s;␊ |
| 373 | }␊ |
| 374 | #endif␊ |
| 375 | /* ␊ |
| 376 | * Deprecation Warning:␊ |
| 377 | *␉strcat() is being deprecated. Please use strlcat() instead.␊ |
| 378 | */␊ |
| 379 | char *␊ |
| 380 | strcat(␊ |
| 381 | ␉ char *dest,␊ |
| 382 | ␉ const char *src)␊ |
| 383 | {␊ |
| 384 | ␉char *old = dest;␊ |
| 385 | ␉␊ |
| 386 | ␉while (*dest)␊ |
| 387 | ␉␉++dest;␊ |
| 388 | ␉while ((*dest++ = *src++))␊ |
| 389 | ␉␉;␊ |
| 390 | ␉return (old);␊ |
| 391 | }␊ |
| 392 | ␊ |
| 393 | /*␊ |
| 394 | * STRDUP␊ |
| 395 | *␊ |
| 396 | * Description: The STRDUP function allocates sufficient memory for a copy␊ |
| 397 | * of the string "string", does the copy, and returns a pointer␊ |
| 398 | * it. The pointer may subsequently be used as an argument to␊ |
| 399 | * the macro FREE().␊ |
| 400 | *␊ |
| 401 | * Parameters: string␉␉String to be duplicated␊ |
| 402 | *␊ |
| 403 | * Returns: char * A pointer to the newly allocated string with␊ |
| 404 | * duplicated contents in it.␊ |
| 405 | *␊ |
| 406 | * NULL␉␉If MALLOC() fails.␊ |
| 407 | * ␊ |
| 408 | */␊ |
| 409 | ␊ |
| 410 | static char *␊ |
| 411 | STRDUP(const char *string)␊ |
| 412 | {␊ |
| 413 | ␉size_t len;␊ |
| 414 | ␉char *copy; ␊ |
| 415 | ␉␊ |
| 416 | ␉len = strlen(string) + 1;␊ |
| 417 | ␉copy = malloc(len);␊ |
| 418 | ␉if (copy == NULL)␊ |
| 419 | ␉␉return (NULL);␊ |
| 420 | ␉bcopy(string, copy, len);␊ |
| 421 | ␉return (copy); ␊ |
| 422 | }␊ |
| 423 | ␊ |
| 424 | char *strdup(const char *string)␊ |
| 425 | {␊ |
| 426 | ␉if (string) {␊ |
| 427 | ␉␉return STRDUP(string);␊ |
| 428 | ␉}␊ |
| 429 | ␉return (NULL);␊ |
| 430 | }␊ |
| 431 | ␊ |
| 432 | #if STRNCASECMP␊ |
| 433 | ␊ |
| 434 | //␊ |
| 435 | // Lame implementation just for use by strcasecmp/strncasecmp␊ |
| 436 | //␊ |
| 437 | static int␊ |
| 438 | tolower(unsigned char ch)␊ |
| 439 | {␊ |
| 440 | if (ch >= 'A' && ch <= 'Z')␊ |
| 441 | ␉␉ch = 'a' + (ch - 'A');␊ |
| 442 | ␉␊ |
| 443 | return ch;␊ |
| 444 | }␊ |
| 445 | ␊ |
| 446 | int␊ |
| 447 | strcasecmp(const char *s1, const char *s2)␊ |
| 448 | {␊ |
| 449 | const unsigned char *us1 = (const u_char *)s1,␊ |
| 450 | ␉*us2 = (const u_char *)s2;␊ |
| 451 | ␉␊ |
| 452 | while (tolower(*us1) == tolower(*us2++))␊ |
| 453 | ␉␉if (*us1++ == '\0')␊ |
| 454 | ␉␉␉return (0);␊ |
| 455 | return (tolower(*us1) - tolower(*--us2));␊ |
| 456 | }␊ |
| 457 | ␊ |
| 458 | int␊ |
| 459 | strncasecmp(const char *s1, const char *s2, size_t n)␊ |
| 460 | {␊ |
| 461 | if (n != 0) {␊ |
| 462 | ␉␉const unsigned char *us1 = (const u_char *)s1,␊ |
| 463 | ␉␉*us2 = (const u_char *)s2;␊ |
| 464 | ␉␉␊ |
| 465 | ␉␉do {␊ |
| 466 | ␉␉␉if (tolower(*us1) != tolower(*us2++))␊ |
| 467 | ␉␉␉␉return (tolower(*us1) - tolower(*--us2));␊ |
| 468 | ␉␉␉if (*us1++ == '\0')␊ |
| 469 | ␉␉␉␉break;␊ |
| 470 | ␉␉} while (--n != 0);␊ |
| 471 | }␊ |
| 472 | return (0);␊ |
| 473 | }␊ |
| 474 | #endif␊ |
| 475 | ␊ |
| 476 | /*␊ |
| 477 | *␊ |
| 478 | */␊ |
| 479 | ␊ |
| 480 | char *strchr(const char *str, int ch)␊ |
| 481 | {␊ |
| 482 | do {␊ |
| 483 | ␉␉if (*str == ch)␊ |
| 484 | ␉␉␉return(__CAST_AWAY_QUALIFIER(str, const, char *));␊ |
| 485 | } while (*str++);␊ |
| 486 | return ((char *) 0);␊ |
| 487 | } ␊ |
| 488 | ␊ |
| 489 | char* strbreak(const char *str, char **next, long *len)␊ |
| 490 | {␊ |
| 491 | char *start = (char*)str, *end;␊ |
| 492 | bool quoted = false;␊ |
| 493 | ␊ |
| 494 | if ( !start || !len )␊ |
| 495 | return 0;␊ |
| 496 | ␊ |
| 497 | *len = 0;␊ |
| 498 | ␊ |
| 499 | while ( isspace(*start) )␊ |
| 500 | start++;␊ |
| 501 | ␊ |
| 502 | if (*start == '"')␊ |
| 503 | {␊ |
| 504 | start++;␊ |
| 505 | ␊ |
| 506 | end = strchr(start, '"');␊ |
| 507 | if(end)␊ |
| 508 | quoted = true;␊ |
| 509 | else␊ |
| 510 | end = strchr(start, '\0');␊ |
| 511 | }␊ |
| 512 | else␊ |
| 513 | {␊ |
| 514 | for ( end = start; *end && !isspace(*end); end++ )␊ |
| 515 | {}␊ |
| 516 | }␊ |
| 517 | ␊ |
| 518 | *len = end - start;␊ |
| 519 | ␊ |
| 520 | if(next)␊ |
| 521 | *next = quoted ? end+1 : end;␊ |
| 522 | ␊ |
| 523 | return start;␊ |
| 524 | }␊ |
| 525 | ␊ |
| 526 | unsigned long␊ |
| 527 | adler32( unsigned char * buffer, long length )␊ |
| 528 | {␊ |
| 529 | long cnt;␊ |
| 530 | unsigned long result, lowHalf, highHalf;␊ |
| 531 | ␊ |
| 532 | lowHalf = 1;␊ |
| 533 | highHalf = 0;␊ |
| 534 | ␉␊ |
| 535 | ␉for ( cnt = 0; cnt < length; cnt++ )␊ |
| 536 | {␊ |
| 537 | if ((cnt % 5000) == 0)␊ |
| 538 | {␊ |
| 539 | lowHalf %= 65521L;␊ |
| 540 | highHalf %= 65521L;␊ |
| 541 | }␊ |
| 542 | ␉␉␊ |
| 543 | lowHalf += buffer[cnt];␊ |
| 544 | highHalf += lowHalf;␊ |
| 545 | }␊ |
| 546 | ␉␊ |
| 547 | ␉lowHalf %= 65521L;␊ |
| 548 | ␉highHalf %= 65521L;␊ |
| 549 | ␉␊ |
| 550 | ␉result = (highHalf << 16) | lowHalf;␊ |
| 551 | ␉␊ |
| 552 | ␉return result;␊ |
| 553 | }␊ |
| 554 | ␊ |
| 555 | /*-␊ |
| 556 | * For memcmp, bsearch.␊ |
| 557 | * Copyright (c) 1990, 1993␊ |
| 558 | *␉The Regents of the University of California. All rights reserved.␊ |
| 559 | *␊ |
| 560 | * This code is derived from software contributed to Berkeley by␊ |
| 561 | * Chris Torek.␊ |
| 562 | *␊ |
| 563 | * Redistribution and use in source and binary forms, with or without␊ |
| 564 | * modification, are permitted provided that the following conditions␊ |
| 565 | * are met:␊ |
| 566 | * 1. Redistributions of source code must retain the above copyright␊ |
| 567 | * notice, this list of conditions and the following disclaimer.␊ |
| 568 | * 2. Redistributions in binary form must reproduce the above copyright␊ |
| 569 | * notice, this list of conditions and the following disclaimer in the␊ |
| 570 | * documentation and/or other materials provided with the distribution.␊ |
| 571 | * 4. Neither the name of the University nor the names of its contributors␊ |
| 572 | * may be used to endorse or promote products derived from this software␊ |
| 573 | * without specific prior written permission.␊ |
| 574 | *␊ |
| 575 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND␊ |
| 576 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE␊ |
| 577 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE␊ |
| 578 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE␊ |
| 579 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL␊ |
| 580 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS␊ |
| 581 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)␊ |
| 582 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT␊ |
| 583 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY␊ |
| 584 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF␊ |
| 585 | * SUCH DAMAGE.␊ |
| 586 | */␊ |
| 587 | ␊ |
| 588 | /*␊ |
| 589 | * Compare memory regions.␊ |
| 590 | */␊ |
| 591 | int␊ |
| 592 | memcmp(const void *s1, const void *s2, size_t n)␊ |
| 593 | {␊ |
| 594 | ␉if (n != 0) {␊ |
| 595 | ␉␉const unsigned char *p1 = s1, *p2 = s2;␊ |
| 596 | ␉␉␊ |
| 597 | ␉␉do {␊ |
| 598 | ␉␉␉if (*p1++ != *p2++)␊ |
| 599 | ␉␉␉␉return (*--p1 - *--p2);␊ |
| 600 | ␉␉} while (--n != 0);␊ |
| 601 | ␉}␊ |
| 602 | ␉return (0);␊ |
| 603 | }␊ |
| 604 | ␊ |
| 605 | /*␊ |
| 606 | * Perform a binary search.␊ |
| 607 | *␊ |
| 608 | * The code below is a bit sneaky. After a comparison fails, we␊ |
| 609 | * divide the work in half by moving either left or right. If lim␊ |
| 610 | * is odd, moving left simply involves halving lim: e.g., when lim␊ |
| 611 | * is 5 we look at item 2, so we change lim to 2 so that we will␊ |
| 612 | * look at items 0 & 1. If lim is even, the same applies. If lim␊ |
| 613 | * is odd, moving right again involes halving lim, this time moving␊ |
| 614 | * the base up one item past p: e.g., when lim is 5 we change base␊ |
| 615 | * to item 3 and make lim 2 so that we will look at items 3 and 4.␊ |
| 616 | * If lim is even, however, we have to shrink it by one before␊ |
| 617 | * halving: e.g., when lim is 4, we still looked at item 2, so we␊ |
| 618 | * have to make lim 3, then halve, obtaining 1, so that we will only␊ |
| 619 | * look at item 3.␊ |
| 620 | */␊ |
| 621 | void *␊ |
| 622 | bsearch(key, base0, nmemb, size, compar)␊ |
| 623 | register const void *key;␊ |
| 624 | const void *base0;␊ |
| 625 | size_t nmemb;␊ |
| 626 | register size_t size;␊ |
| 627 | register int (*compar)(const void *, const void *);␊ |
| 628 | {␊ |
| 629 | ␉register const char *base = base0;␊ |
| 630 | ␉register size_t lim;␊ |
| 631 | ␉register int cmp;␊ |
| 632 | ␉register const void *p;␊ |
| 633 | ␊ |
| 634 | ␉for (lim = nmemb; lim != 0; lim >>= 1) {␊ |
| 635 | ␉␉p = base + (lim >> 1) * size;␊ |
| 636 | ␉␉cmp = (*compar)(key, p);␊ |
| 637 | ␉␉if (cmp == 0)␊ |
| 638 | ␉␉␉return ((void *)(uintptr_t)p);␊ |
| 639 | ␉␉if (cmp > 0) {␉/* key > p: move right */␊ |
| 640 | ␉␉␉base = (const char *)p + size;␊ |
| 641 | ␉␉␉lim--;␊ |
| 642 | ␉␉}␉␉/* else move left */␊ |
| 643 | ␉}␊ |
| 644 | ␉return (NULL);␊ |
| 645 | }␊ |
| 646 | |
