string.c revision 298845
1251881Speter/* 2251881Speter * string.c: routines to manipulate counted-length strings 3251881Speter * (svn_stringbuf_t and svn_string_t) and C strings. 4251881Speter * 5251881Speter * 6251881Speter * ==================================================================== 7251881Speter * Licensed to the Apache Software Foundation (ASF) under one 8251881Speter * or more contributor license agreements. See the NOTICE file 9251881Speter * distributed with this work for additional information 10251881Speter * regarding copyright ownership. The ASF licenses this file 11251881Speter * to you under the Apache License, Version 2.0 (the 12251881Speter * "License"); you may not use this file except in compliance 13251881Speter * with the License. You may obtain a copy of the License at 14251881Speter * 15251881Speter * http://www.apache.org/licenses/LICENSE-2.0 16251881Speter * 17251881Speter * Unless required by applicable law or agreed to in writing, 18251881Speter * software distributed under the License is distributed on an 19251881Speter * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 20251881Speter * KIND, either express or implied. See the License for the 21251881Speter * specific language governing permissions and limitations 22251881Speter * under the License. 23251881Speter * ==================================================================== 24251881Speter */ 25251881Speter 26251881Speter 27251881Speter 28251881Speter#include <apr.h> 29289180Speter#include <assert.h> 30251881Speter 31251881Speter#include <string.h> /* for memcpy(), memcmp(), strlen() */ 32251881Speter#include <apr_fnmatch.h> 33251881Speter#include "svn_string.h" /* loads "svn_types.h" and <apr_pools.h> */ 34251881Speter#include "svn_ctype.h" 35251881Speter#include "private/svn_dep_compat.h" 36251881Speter#include "private/svn_string_private.h" 37251881Speter 38251881Speter#include "svn_private_config.h" 39251881Speter 40251881Speter 41251881Speter 42251881Speter/* Allocate the space for a memory buffer from POOL. 43251881Speter * Return a pointer to the new buffer in *DATA and its size in *SIZE. 44251881Speter * The buffer size will be at least MINIMUM_SIZE. 45251881Speter * 46251881Speter * N.B.: The stringbuf creation functions use this, but since stringbufs 47251881Speter * always consume at least 1 byte for the NUL terminator, the 48251881Speter * resulting data pointers will never be NULL. 49251881Speter */ 50251881Speterstatic APR_INLINE void 51251881Spetermembuf_create(void **data, apr_size_t *size, 52251881Speter apr_size_t minimum_size, apr_pool_t *pool) 53251881Speter{ 54251881Speter /* apr_palloc will allocate multiples of 8. 55251881Speter * Thus, we would waste some of that memory if we stuck to the 56251881Speter * smaller size. Note that this is safe even if apr_palloc would 57289180Speter * use some other alignment or none at all. */ 58251881Speter minimum_size = APR_ALIGN_DEFAULT(minimum_size); 59289180Speter *data = apr_palloc(pool, minimum_size); 60251881Speter *size = minimum_size; 61251881Speter} 62251881Speter 63251881Speter/* Ensure that the size of a given memory buffer is at least MINIMUM_SIZE 64251881Speter * bytes. If *SIZE is already greater than or equal to MINIMUM_SIZE, 65251881Speter * this function does nothing. 66251881Speter * 67251881Speter * If *SIZE is 0, the allocated buffer size will be MINIMUM_SIZE 68251881Speter * rounded up to the nearest APR alignment boundary. Otherwse, *SIZE 69251881Speter * will be multiplied by a power of two such that the result is 70251881Speter * greater or equal to MINIMUM_SIZE. The pointer to the new buffer 71251881Speter * will be returned in *DATA, and its size in *SIZE. 72251881Speter */ 73251881Speterstatic APR_INLINE void 74251881Spetermembuf_ensure(void **data, apr_size_t *size, 75251881Speter apr_size_t minimum_size, apr_pool_t *pool) 76251881Speter{ 77251881Speter if (minimum_size > *size) 78251881Speter { 79251881Speter apr_size_t new_size = *size; 80251881Speter 81251881Speter if (new_size == 0) 82251881Speter new_size = minimum_size; 83251881Speter else 84251881Speter while (new_size < minimum_size) 85251881Speter { 86251881Speter const apr_size_t prev_size = new_size; 87251881Speter new_size *= 2; 88251881Speter 89251881Speter /* check for apr_size_t overflow */ 90251881Speter if (prev_size > new_size) 91251881Speter { 92251881Speter new_size = minimum_size; 93251881Speter break; 94251881Speter } 95251881Speter } 96251881Speter 97251881Speter membuf_create(data, size, new_size, pool); 98251881Speter } 99251881Speter} 100251881Speter 101251881Spetervoid 102251881Spetersvn_membuf__create(svn_membuf_t *membuf, apr_size_t size, apr_pool_t *pool) 103251881Speter{ 104251881Speter membuf_create(&membuf->data, &membuf->size, size, pool); 105251881Speter membuf->pool = pool; 106251881Speter} 107251881Speter 108251881Spetervoid 109251881Spetersvn_membuf__ensure(svn_membuf_t *membuf, apr_size_t size) 110251881Speter{ 111251881Speter membuf_ensure(&membuf->data, &membuf->size, size, membuf->pool); 112251881Speter} 113251881Speter 114251881Spetervoid 115251881Spetersvn_membuf__resize(svn_membuf_t *membuf, apr_size_t size) 116251881Speter{ 117251881Speter const void *const old_data = membuf->data; 118251881Speter const apr_size_t old_size = membuf->size; 119251881Speter 120251881Speter membuf_ensure(&membuf->data, &membuf->size, size, membuf->pool); 121289180Speter 122289180Speter /* If we re-allocated MEMBUF->DATA, it cannot be NULL. 123289180Speter * Statically initialized membuffers (OLD_DATA) may be NULL, though. */ 124289180Speter if (old_data && old_data != membuf->data) 125251881Speter memcpy(membuf->data, old_data, old_size); 126251881Speter} 127251881Speter 128251881Speter/* Always provide an out-of-line implementation of svn_membuf__zero */ 129251881Speter#undef svn_membuf__zero 130251881Spetervoid 131251881Spetersvn_membuf__zero(svn_membuf_t *membuf) 132251881Speter{ 133251881Speter SVN_MEMBUF__ZERO(membuf); 134251881Speter} 135251881Speter 136251881Speter/* Always provide an out-of-line implementation of svn_membuf__nzero */ 137251881Speter#undef svn_membuf__nzero 138251881Spetervoid 139251881Spetersvn_membuf__nzero(svn_membuf_t *membuf, apr_size_t size) 140251881Speter{ 141251881Speter SVN_MEMBUF__NZERO(membuf, size); 142251881Speter} 143251881Speter 144251881Speterstatic APR_INLINE svn_boolean_t 145251881Speterstring_compare(const char *str1, 146251881Speter const char *str2, 147251881Speter apr_size_t len1, 148251881Speter apr_size_t len2) 149251881Speter{ 150251881Speter /* easy way out :) */ 151251881Speter if (len1 != len2) 152251881Speter return FALSE; 153251881Speter 154289180Speter /* now the strings must have identical lengths */ 155251881Speter 156251881Speter if ((memcmp(str1, str2, len1)) == 0) 157251881Speter return TRUE; 158251881Speter else 159251881Speter return FALSE; 160251881Speter} 161251881Speter 162251881Speterstatic APR_INLINE apr_size_t 163251881Speterstring_first_non_whitespace(const char *str, apr_size_t len) 164251881Speter{ 165251881Speter apr_size_t i; 166251881Speter 167251881Speter for (i = 0; i < len; i++) 168251881Speter { 169251881Speter if (! svn_ctype_isspace(str[i])) 170251881Speter return i; 171251881Speter } 172251881Speter 173251881Speter /* if we get here, then the string must be entirely whitespace */ 174251881Speter return len; 175251881Speter} 176251881Speter 177251881Speterstatic APR_INLINE apr_size_t 178251881Speterfind_char_backward(const char *str, apr_size_t len, char ch) 179251881Speter{ 180251881Speter apr_size_t i = len; 181251881Speter 182251881Speter while (i != 0) 183251881Speter { 184251881Speter if (str[--i] == ch) 185251881Speter return i; 186251881Speter } 187251881Speter 188251881Speter /* char was not found, return len */ 189251881Speter return len; 190251881Speter} 191251881Speter 192251881Speter 193251881Speter/* svn_string functions */ 194251881Speter 195251881Speter/* Return a new svn_string_t object, allocated in POOL, initialized with 196251881Speter * DATA and SIZE. Do not copy the contents of DATA, just store the pointer. 197251881Speter * SIZE is the length in bytes of DATA, excluding the required NUL 198251881Speter * terminator. */ 199251881Speterstatic svn_string_t * 200251881Spetercreate_string(const char *data, apr_size_t size, 201251881Speter apr_pool_t *pool) 202251881Speter{ 203251881Speter svn_string_t *new_string; 204251881Speter 205251881Speter new_string = apr_palloc(pool, sizeof(*new_string)); 206251881Speter 207251881Speter new_string->data = data; 208251881Speter new_string->len = size; 209251881Speter 210251881Speter return new_string; 211251881Speter} 212251881Speter 213251881Speter/* A data buffer for a zero-length string (just a null terminator). Many 214251881Speter * svn_string_t instances may share this same buffer. */ 215251881Speterstatic const char empty_buffer[1] = {0}; 216251881Speter 217251881Spetersvn_string_t * 218251881Spetersvn_string_create_empty(apr_pool_t *pool) 219251881Speter{ 220251881Speter svn_string_t *new_string = apr_palloc(pool, sizeof(*new_string)); 221251881Speter new_string->data = empty_buffer; 222251881Speter new_string->len = 0; 223251881Speter 224251881Speter return new_string; 225251881Speter} 226251881Speter 227251881Speter 228251881Spetersvn_string_t * 229251881Spetersvn_string_ncreate(const char *bytes, apr_size_t size, apr_pool_t *pool) 230251881Speter{ 231251881Speter void *mem; 232251881Speter char *data; 233251881Speter svn_string_t *new_string; 234251881Speter 235251881Speter /* Allocate memory for svn_string_t and data in one chunk. */ 236251881Speter mem = apr_palloc(pool, sizeof(*new_string) + size + 1); 237251881Speter data = (char*)mem + sizeof(*new_string); 238251881Speter 239251881Speter new_string = mem; 240251881Speter new_string->data = data; 241251881Speter new_string->len = size; 242251881Speter 243289180Speter /* If SIZE is 0, NULL is valid for BYTES. */ 244289180Speter if (size) 245289180Speter memcpy(data, bytes, size); 246251881Speter 247251881Speter /* Null termination is the convention -- even if we suspect the data 248251881Speter to be binary, it's not up to us to decide, it's the caller's 249251881Speter call. Heck, that's why they call it the caller! */ 250251881Speter data[size] = '\0'; 251251881Speter 252251881Speter return new_string; 253251881Speter} 254251881Speter 255251881Speter 256251881Spetersvn_string_t * 257251881Spetersvn_string_create(const char *cstring, apr_pool_t *pool) 258251881Speter{ 259251881Speter return svn_string_ncreate(cstring, strlen(cstring), pool); 260251881Speter} 261251881Speter 262251881Speter 263251881Spetersvn_string_t * 264251881Spetersvn_string_create_from_buf(const svn_stringbuf_t *strbuf, apr_pool_t *pool) 265251881Speter{ 266251881Speter return svn_string_ncreate(strbuf->data, strbuf->len, pool); 267251881Speter} 268251881Speter 269251881Speter 270251881Spetersvn_string_t * 271251881Spetersvn_string_createv(apr_pool_t *pool, const char *fmt, va_list ap) 272251881Speter{ 273251881Speter char *data = apr_pvsprintf(pool, fmt, ap); 274251881Speter 275251881Speter /* wrap an svn_string_t around the new data */ 276251881Speter return create_string(data, strlen(data), pool); 277251881Speter} 278251881Speter 279251881Speter 280251881Spetersvn_string_t * 281251881Spetersvn_string_createf(apr_pool_t *pool, const char *fmt, ...) 282251881Speter{ 283251881Speter svn_string_t *str; 284251881Speter 285251881Speter va_list ap; 286251881Speter va_start(ap, fmt); 287251881Speter str = svn_string_createv(pool, fmt, ap); 288251881Speter va_end(ap); 289251881Speter 290251881Speter return str; 291251881Speter} 292251881Speter 293251881Speter 294251881Spetersvn_boolean_t 295251881Spetersvn_string_isempty(const svn_string_t *str) 296251881Speter{ 297251881Speter return (str->len == 0); 298251881Speter} 299251881Speter 300251881Speter 301251881Spetersvn_string_t * 302251881Spetersvn_string_dup(const svn_string_t *original_string, apr_pool_t *pool) 303251881Speter{ 304289180Speter return (original_string ? svn_string_ncreate(original_string->data, 305289180Speter original_string->len, pool) 306289180Speter : NULL); 307251881Speter} 308251881Speter 309251881Speter 310251881Speter 311251881Spetersvn_boolean_t 312251881Spetersvn_string_compare(const svn_string_t *str1, const svn_string_t *str2) 313251881Speter{ 314251881Speter return 315251881Speter string_compare(str1->data, str2->data, str1->len, str2->len); 316251881Speter} 317251881Speter 318251881Speter 319251881Speter 320251881Speterapr_size_t 321251881Spetersvn_string_first_non_whitespace(const svn_string_t *str) 322251881Speter{ 323251881Speter return 324251881Speter string_first_non_whitespace(str->data, str->len); 325251881Speter} 326251881Speter 327251881Speter 328251881Speterapr_size_t 329251881Spetersvn_string_find_char_backward(const svn_string_t *str, char ch) 330251881Speter{ 331251881Speter return find_char_backward(str->data, str->len, ch); 332251881Speter} 333251881Speter 334251881Spetersvn_string_t * 335251881Spetersvn_stringbuf__morph_into_string(svn_stringbuf_t *strbuf) 336251881Speter{ 337251881Speter /* In debug mode, detect attempts to modify the original STRBUF object. 338251881Speter */ 339251881Speter#ifdef SVN_DEBUG 340251881Speter strbuf->pool = NULL; 341251881Speter strbuf->blocksize = strbuf->len + 1; 342251881Speter#endif 343251881Speter 344251881Speter /* Both, svn_string_t and svn_stringbuf_t are public API structures 345251881Speter * since the svn epoch. Thus, we can rely on their precise layout not 346251881Speter * to change. 347251881Speter * 348251881Speter * It just so happens that svn_string_t is structurally equivalent 349251881Speter * to the (data, len) sub-set of svn_stringbuf_t. There is also no 350251881Speter * difference in alignment and padding. So, we can just re-interpret 351251881Speter * that part of STRBUF as a svn_string_t. 352251881Speter * 353251881Speter * However, since svn_string_t does not know about the blocksize 354251881Speter * member in svn_stringbuf_t, any attempt to re-size the returned 355251881Speter * svn_string_t might invalidate the STRBUF struct. Hence, we consider 356251881Speter * the source STRBUF "consumed". 357251881Speter * 358251881Speter * Modifying the string character content is fine, though. 359251881Speter */ 360251881Speter return (svn_string_t *)&strbuf->data; 361251881Speter} 362251881Speter 363251881Speter 364251881Speter 365251881Speter/* svn_stringbuf functions */ 366251881Speter 367251881Spetersvn_stringbuf_t * 368251881Spetersvn_stringbuf_create_empty(apr_pool_t *pool) 369251881Speter{ 370251881Speter return svn_stringbuf_create_ensure(0, pool); 371251881Speter} 372251881Speter 373251881Spetersvn_stringbuf_t * 374251881Spetersvn_stringbuf_create_ensure(apr_size_t blocksize, apr_pool_t *pool) 375251881Speter{ 376251881Speter void *mem; 377251881Speter svn_stringbuf_t *new_string; 378251881Speter 379251881Speter ++blocksize; /* + space for '\0' */ 380251881Speter 381251881Speter /* Allocate memory for svn_string_t and data in one chunk. */ 382251881Speter membuf_create(&mem, &blocksize, blocksize + sizeof(*new_string), pool); 383251881Speter 384251881Speter /* Initialize header and string */ 385251881Speter new_string = mem; 386251881Speter new_string->data = (char*)mem + sizeof(*new_string); 387251881Speter new_string->data[0] = '\0'; 388251881Speter new_string->len = 0; 389251881Speter new_string->blocksize = blocksize - sizeof(*new_string); 390251881Speter new_string->pool = pool; 391251881Speter 392251881Speter return new_string; 393251881Speter} 394251881Speter 395251881Spetersvn_stringbuf_t * 396251881Spetersvn_stringbuf_ncreate(const char *bytes, apr_size_t size, apr_pool_t *pool) 397251881Speter{ 398251881Speter svn_stringbuf_t *strbuf = svn_stringbuf_create_ensure(size, pool); 399251881Speter 400289180Speter /* If SIZE is 0, NULL is valid for BYTES. */ 401289180Speter if (size) 402289180Speter memcpy(strbuf->data, bytes, size); 403289180Speter 404251881Speter /* Null termination is the convention -- even if we suspect the data 405251881Speter to be binary, it's not up to us to decide, it's the caller's 406251881Speter call. Heck, that's why they call it the caller! */ 407251881Speter strbuf->data[size] = '\0'; 408251881Speter strbuf->len = size; 409251881Speter 410251881Speter return strbuf; 411251881Speter} 412251881Speter 413251881Speter 414251881Spetersvn_stringbuf_t * 415251881Spetersvn_stringbuf_create(const char *cstring, apr_pool_t *pool) 416251881Speter{ 417251881Speter return svn_stringbuf_ncreate(cstring, strlen(cstring), pool); 418251881Speter} 419251881Speter 420251881Speter 421251881Spetersvn_stringbuf_t * 422251881Spetersvn_stringbuf_create_from_string(const svn_string_t *str, apr_pool_t *pool) 423251881Speter{ 424251881Speter return svn_stringbuf_ncreate(str->data, str->len, pool); 425251881Speter} 426251881Speter 427289180Spetersvn_stringbuf_t * 428289180Spetersvn_stringbuf_create_wrap(char *str, apr_pool_t *pool) 429289180Speter{ 430289180Speter svn_stringbuf_t *result = apr_palloc(pool, sizeof(*result)); 431289180Speter result->pool = pool; 432289180Speter result->data = str; 433289180Speter result->len = strlen(str); 434289180Speter result->blocksize = result->len + 1; 435251881Speter 436289180Speter return result; 437289180Speter} 438289180Speter 439251881Spetersvn_stringbuf_t * 440251881Spetersvn_stringbuf_createv(apr_pool_t *pool, const char *fmt, va_list ap) 441251881Speter{ 442251881Speter char *data = apr_pvsprintf(pool, fmt, ap); 443251881Speter apr_size_t size = strlen(data); 444251881Speter svn_stringbuf_t *new_string; 445251881Speter 446251881Speter new_string = apr_palloc(pool, sizeof(*new_string)); 447251881Speter new_string->data = data; 448251881Speter new_string->len = size; 449251881Speter new_string->blocksize = size + 1; 450251881Speter new_string->pool = pool; 451251881Speter 452251881Speter return new_string; 453251881Speter} 454251881Speter 455251881Speter 456251881Spetersvn_stringbuf_t * 457251881Spetersvn_stringbuf_createf(apr_pool_t *pool, const char *fmt, ...) 458251881Speter{ 459251881Speter svn_stringbuf_t *str; 460251881Speter 461251881Speter va_list ap; 462251881Speter va_start(ap, fmt); 463251881Speter str = svn_stringbuf_createv(pool, fmt, ap); 464251881Speter va_end(ap); 465251881Speter 466251881Speter return str; 467251881Speter} 468251881Speter 469251881Speter 470251881Spetervoid 471251881Spetersvn_stringbuf_fillchar(svn_stringbuf_t *str, unsigned char c) 472251881Speter{ 473251881Speter memset(str->data, c, str->len); 474251881Speter} 475251881Speter 476251881Speter 477251881Spetervoid 478251881Spetersvn_stringbuf_set(svn_stringbuf_t *str, const char *value) 479251881Speter{ 480251881Speter apr_size_t amt = strlen(value); 481251881Speter 482251881Speter svn_stringbuf_ensure(str, amt); 483251881Speter memcpy(str->data, value, amt + 1); 484251881Speter str->len = amt; 485251881Speter} 486251881Speter 487251881Spetervoid 488251881Spetersvn_stringbuf_setempty(svn_stringbuf_t *str) 489251881Speter{ 490251881Speter if (str->len > 0) 491251881Speter str->data[0] = '\0'; 492251881Speter 493251881Speter str->len = 0; 494251881Speter} 495251881Speter 496251881Speter 497251881Spetervoid 498251881Spetersvn_stringbuf_chop(svn_stringbuf_t *str, apr_size_t nbytes) 499251881Speter{ 500251881Speter if (nbytes > str->len) 501251881Speter str->len = 0; 502251881Speter else 503251881Speter str->len -= nbytes; 504251881Speter 505251881Speter str->data[str->len] = '\0'; 506251881Speter} 507251881Speter 508251881Speter 509251881Spetersvn_boolean_t 510251881Spetersvn_stringbuf_isempty(const svn_stringbuf_t *str) 511251881Speter{ 512251881Speter return (str->len == 0); 513251881Speter} 514251881Speter 515251881Speter 516251881Spetervoid 517251881Spetersvn_stringbuf_ensure(svn_stringbuf_t *str, apr_size_t minimum_size) 518251881Speter{ 519251881Speter void *mem = NULL; 520251881Speter ++minimum_size; /* + space for '\0' */ 521251881Speter 522251881Speter membuf_ensure(&mem, &str->blocksize, minimum_size, str->pool); 523251881Speter if (mem && mem != str->data) 524251881Speter { 525251881Speter if (str->data) 526251881Speter memcpy(mem, str->data, str->len + 1); 527251881Speter str->data = mem; 528251881Speter } 529251881Speter} 530251881Speter 531251881Speter 532251881Speter/* WARNING - Optimized code ahead! 533251881Speter * This function has been hand-tuned for performance. Please read 534251881Speter * the comments below before modifying the code. 535251881Speter */ 536251881Spetervoid 537251881Spetersvn_stringbuf_appendbyte(svn_stringbuf_t *str, char byte) 538251881Speter{ 539251881Speter char *dest; 540251881Speter apr_size_t old_len = str->len; 541251881Speter 542251881Speter /* In most cases, there will be pre-allocated memory left 543251881Speter * to just write the new byte at the end of the used section 544251881Speter * and terminate the string properly. 545251881Speter */ 546251881Speter if (str->blocksize > old_len + 1) 547251881Speter { 548251881Speter /* The following read does not depend this write, so we 549251881Speter * can issue the write first to minimize register pressure: 550251881Speter * The value of old_len+1 is no longer needed; on most processors, 551251881Speter * dest[old_len+1] will be calculated implicitly as part of 552251881Speter * the addressing scheme. 553251881Speter */ 554251881Speter str->len = old_len+1; 555251881Speter 556251881Speter /* Since the compiler cannot be sure that *src->data and *src 557251881Speter * don't overlap, we read src->data *once* before writing 558251881Speter * to *src->data. Replacing dest with str->data would force 559251881Speter * the compiler to read it again after the first byte. 560251881Speter */ 561251881Speter dest = str->data; 562251881Speter 563251881Speter /* If not already available in a register as per ABI, load 564251881Speter * "byte" into the register (e.g. the one freed from old_len+1), 565251881Speter * then write it to the string buffer and terminate it properly. 566251881Speter * 567251881Speter * Including the "byte" fetch, all operations so far could be 568251881Speter * issued at once and be scheduled at the CPU's descression. 569251881Speter * Most likely, no-one will soon depend on the data that will be 570251881Speter * written in this function. So, no stalls there, either. 571251881Speter */ 572251881Speter dest[old_len] = byte; 573251881Speter dest[old_len+1] = '\0'; 574251881Speter } 575251881Speter else 576251881Speter { 577251881Speter /* we need to re-allocate the string buffer 578251881Speter * -> let the more generic implementation take care of that part 579251881Speter */ 580251881Speter 581251881Speter /* Depending on the ABI, "byte" is a register value. If we were 582251881Speter * to take its address directly, the compiler might decide to 583251881Speter * put in on the stack *unconditionally*, even if that would 584251881Speter * only be necessary for this block. 585251881Speter */ 586251881Speter char b = byte; 587251881Speter svn_stringbuf_appendbytes(str, &b, 1); 588251881Speter } 589251881Speter} 590251881Speter 591251881Speter 592251881Spetervoid 593251881Spetersvn_stringbuf_appendbytes(svn_stringbuf_t *str, const char *bytes, 594251881Speter apr_size_t count) 595251881Speter{ 596251881Speter apr_size_t total_len; 597251881Speter void *start_address; 598251881Speter 599289180Speter if (!count) 600289180Speter /* Allow BYTES to be NULL by avoiding passing it to memcpy. */ 601289180Speter return; 602289180Speter 603251881Speter total_len = str->len + count; /* total size needed */ 604251881Speter 605251881Speter /* svn_stringbuf_ensure adds 1 for null terminator. */ 606251881Speter svn_stringbuf_ensure(str, total_len); 607251881Speter 608251881Speter /* get address 1 byte beyond end of original bytestring */ 609251881Speter start_address = (str->data + str->len); 610251881Speter 611251881Speter memcpy(start_address, bytes, count); 612251881Speter str->len = total_len; 613251881Speter 614251881Speter str->data[str->len] = '\0'; /* We don't know if this is binary 615251881Speter data or not, but convention is 616251881Speter to null-terminate. */ 617251881Speter} 618251881Speter 619289180Spetervoid 620289180Spetersvn_stringbuf_appendfill(svn_stringbuf_t *str, 621289180Speter char byte, 622289180Speter apr_size_t count) 623289180Speter{ 624289180Speter apr_size_t new_len = str->len + count; 625289180Speter svn_stringbuf_ensure(str, new_len); 626251881Speter 627289180Speter memset(str->data + str->len, byte, count); 628289180Speter 629289180Speter /* update buffer length and always NUL-terminate it */ 630289180Speter str->len = new_len; 631289180Speter str->data[new_len] = '\0'; 632289180Speter} 633289180Speter 634289180Speter 635251881Spetervoid 636251881Spetersvn_stringbuf_appendstr(svn_stringbuf_t *targetstr, 637251881Speter const svn_stringbuf_t *appendstr) 638251881Speter{ 639251881Speter svn_stringbuf_appendbytes(targetstr, appendstr->data, appendstr->len); 640251881Speter} 641251881Speter 642251881Speter 643251881Spetervoid 644251881Spetersvn_stringbuf_appendcstr(svn_stringbuf_t *targetstr, const char *cstr) 645251881Speter{ 646251881Speter svn_stringbuf_appendbytes(targetstr, cstr, strlen(cstr)); 647251881Speter} 648251881Speter 649251881Spetervoid 650251881Spetersvn_stringbuf_insert(svn_stringbuf_t *str, 651251881Speter apr_size_t pos, 652251881Speter const char *bytes, 653251881Speter apr_size_t count) 654251881Speter{ 655289180Speter /* For COUNT==0, we allow BYTES to be NULL. It's a no-op in that case. */ 656289180Speter if (count == 0) 657289180Speter return; 658289180Speter 659289180Speter /* special case: BYTES overlaps with this string -> copy the source */ 660251881Speter if (bytes + count > str->data && bytes < str->data + str->blocksize) 661289180Speter bytes = apr_pmemdup(str->pool, bytes, count); 662251881Speter 663289180Speter if (pos > str->len) 664289180Speter pos = str->len; 665251881Speter 666289180Speter svn_stringbuf_ensure(str, str->len + count); 667289180Speter memmove(str->data + pos + count, str->data + pos, str->len - pos + 1); 668289180Speter memcpy(str->data + pos, bytes, count); 669289180Speter 670289180Speter str->len += count; 671251881Speter} 672251881Speter 673251881Spetervoid 674251881Spetersvn_stringbuf_remove(svn_stringbuf_t *str, 675251881Speter apr_size_t pos, 676251881Speter apr_size_t count) 677251881Speter{ 678251881Speter if (pos > str->len) 679251881Speter pos = str->len; 680298845Sdim if (count > str->len - pos) 681251881Speter count = str->len - pos; 682251881Speter 683251881Speter memmove(str->data + pos, str->data + pos + count, str->len - pos - count + 1); 684251881Speter str->len -= count; 685251881Speter} 686251881Speter 687251881Spetervoid 688251881Spetersvn_stringbuf_replace(svn_stringbuf_t *str, 689251881Speter apr_size_t pos, 690251881Speter apr_size_t old_count, 691251881Speter const char *bytes, 692251881Speter apr_size_t new_count) 693251881Speter{ 694289180Speter /* For COUNT==0, we allow BYTES to be NULL. 695289180Speter * In that case, this is just a substring removal. */ 696289180Speter if (new_count == 0) 697251881Speter { 698289180Speter svn_stringbuf_remove(str, pos, old_count); 699289180Speter return; 700251881Speter } 701251881Speter 702289180Speter /* special case: BYTES overlaps with this string -> copy the source */ 703289180Speter if (bytes + new_count > str->data && bytes < str->data + str->blocksize) 704289180Speter bytes = apr_pmemdup(str->pool, bytes, new_count); 705251881Speter 706289180Speter if (pos > str->len) 707289180Speter pos = str->len; 708298845Sdim if (old_count > str->len - pos) 709289180Speter old_count = str->len - pos; 710251881Speter 711289180Speter if (old_count < new_count) 712289180Speter { 713289180Speter apr_size_t delta = new_count - old_count; 714289180Speter svn_stringbuf_ensure(str, str->len + delta); 715251881Speter } 716289180Speter 717289180Speter if (old_count != new_count) 718289180Speter memmove(str->data + pos + new_count, str->data + pos + old_count, 719289180Speter str->len - pos - old_count + 1); 720289180Speter 721289180Speter memcpy(str->data + pos, bytes, new_count); 722289180Speter str->len += new_count - old_count; 723251881Speter} 724251881Speter 725251881Speter 726251881Spetersvn_stringbuf_t * 727251881Spetersvn_stringbuf_dup(const svn_stringbuf_t *original_string, apr_pool_t *pool) 728251881Speter{ 729251881Speter return (svn_stringbuf_ncreate(original_string->data, 730251881Speter original_string->len, pool)); 731251881Speter} 732251881Speter 733251881Speter 734251881Speter 735251881Spetersvn_boolean_t 736251881Spetersvn_stringbuf_compare(const svn_stringbuf_t *str1, 737251881Speter const svn_stringbuf_t *str2) 738251881Speter{ 739251881Speter return string_compare(str1->data, str2->data, str1->len, str2->len); 740251881Speter} 741251881Speter 742251881Speter 743251881Speter 744251881Speterapr_size_t 745251881Spetersvn_stringbuf_first_non_whitespace(const svn_stringbuf_t *str) 746251881Speter{ 747251881Speter return string_first_non_whitespace(str->data, str->len); 748251881Speter} 749251881Speter 750251881Speter 751251881Spetervoid 752251881Spetersvn_stringbuf_strip_whitespace(svn_stringbuf_t *str) 753251881Speter{ 754251881Speter /* Find first non-whitespace character */ 755251881Speter apr_size_t offset = svn_stringbuf_first_non_whitespace(str); 756251881Speter 757251881Speter /* Go ahead! Waste some RAM, we've got pools! :) */ 758251881Speter str->data += offset; 759251881Speter str->len -= offset; 760251881Speter str->blocksize -= offset; 761251881Speter 762251881Speter /* Now that we've trimmed the front, trim the end, wasting more RAM. */ 763251881Speter while ((str->len > 0) && svn_ctype_isspace(str->data[str->len - 1])) 764251881Speter str->len--; 765251881Speter str->data[str->len] = '\0'; 766251881Speter} 767251881Speter 768251881Speter 769251881Speterapr_size_t 770251881Spetersvn_stringbuf_find_char_backward(const svn_stringbuf_t *str, char ch) 771251881Speter{ 772251881Speter return find_char_backward(str->data, str->len, ch); 773251881Speter} 774251881Speter 775251881Speter 776251881Spetersvn_boolean_t 777251881Spetersvn_string_compare_stringbuf(const svn_string_t *str1, 778251881Speter const svn_stringbuf_t *str2) 779251881Speter{ 780251881Speter return string_compare(str1->data, str2->data, str1->len, str2->len); 781251881Speter} 782251881Speter 783251881Speter 784251881Speter 785251881Speter/*** C string stuff. ***/ 786251881Speter 787251881Spetervoid 788251881Spetersvn_cstring_split_append(apr_array_header_t *array, 789251881Speter const char *input, 790251881Speter const char *sep_chars, 791251881Speter svn_boolean_t chop_whitespace, 792251881Speter apr_pool_t *pool) 793251881Speter{ 794251881Speter char *pats; 795251881Speter char *p; 796251881Speter 797251881Speter pats = apr_pstrdup(pool, input); /* strtok wants non-const data */ 798251881Speter p = svn_cstring_tokenize(sep_chars, &pats); 799251881Speter 800251881Speter while (p) 801251881Speter { 802251881Speter if (chop_whitespace) 803251881Speter { 804251881Speter while (svn_ctype_isspace(*p)) 805251881Speter p++; 806251881Speter 807251881Speter { 808251881Speter char *e = p + (strlen(p) - 1); 809251881Speter while ((e >= p) && (svn_ctype_isspace(*e))) 810251881Speter e--; 811251881Speter *(++e) = '\0'; 812251881Speter } 813251881Speter } 814251881Speter 815251881Speter if (p[0] != '\0') 816251881Speter APR_ARRAY_PUSH(array, const char *) = p; 817251881Speter 818251881Speter p = svn_cstring_tokenize(sep_chars, &pats); 819251881Speter } 820251881Speter 821251881Speter return; 822251881Speter} 823251881Speter 824251881Speter 825251881Speterapr_array_header_t * 826251881Spetersvn_cstring_split(const char *input, 827251881Speter const char *sep_chars, 828251881Speter svn_boolean_t chop_whitespace, 829251881Speter apr_pool_t *pool) 830251881Speter{ 831251881Speter apr_array_header_t *a = apr_array_make(pool, 5, sizeof(input)); 832251881Speter svn_cstring_split_append(a, input, sep_chars, chop_whitespace, pool); 833251881Speter return a; 834251881Speter} 835251881Speter 836251881Speter 837251881Spetersvn_boolean_t svn_cstring_match_glob_list(const char *str, 838251881Speter const apr_array_header_t *list) 839251881Speter{ 840251881Speter int i; 841251881Speter 842251881Speter for (i = 0; i < list->nelts; i++) 843251881Speter { 844251881Speter const char *this_pattern = APR_ARRAY_IDX(list, i, char *); 845251881Speter 846251881Speter if (apr_fnmatch(this_pattern, str, 0) == APR_SUCCESS) 847251881Speter return TRUE; 848251881Speter } 849251881Speter 850251881Speter return FALSE; 851251881Speter} 852251881Speter 853251881Spetersvn_boolean_t 854251881Spetersvn_cstring_match_list(const char *str, const apr_array_header_t *list) 855251881Speter{ 856251881Speter int i; 857251881Speter 858251881Speter for (i = 0; i < list->nelts; i++) 859251881Speter { 860251881Speter const char *this_str = APR_ARRAY_IDX(list, i, char *); 861251881Speter 862251881Speter if (strcmp(this_str, str) == 0) 863251881Speter return TRUE; 864251881Speter } 865251881Speter 866251881Speter return FALSE; 867251881Speter} 868251881Speter 869251881Speterchar * 870251881Spetersvn_cstring_tokenize(const char *sep, char **str) 871251881Speter{ 872251881Speter char *token; 873289180Speter char *next; 874251881Speter char csep; 875251881Speter 876251881Speter /* check parameters */ 877251881Speter if ((sep == NULL) || (str == NULL) || (*str == NULL)) 878251881Speter return NULL; 879251881Speter 880251881Speter /* let APR handle edge cases and multiple separators */ 881251881Speter csep = *sep; 882251881Speter if (csep == '\0' || sep[1] != '\0') 883251881Speter return apr_strtok(NULL, sep, str); 884251881Speter 885251881Speter /* skip characters in sep (will terminate at '\0') */ 886251881Speter token = *str; 887251881Speter while (*token == csep) 888251881Speter ++token; 889251881Speter 890251881Speter if (!*token) /* no more tokens */ 891251881Speter return NULL; 892251881Speter 893251881Speter /* skip valid token characters to terminate token and 894251881Speter * prepare for the next call (will terminate at '\0) 895251881Speter */ 896251881Speter next = strchr(token, csep); 897251881Speter if (next == NULL) 898251881Speter { 899251881Speter *str = token + strlen(token); 900251881Speter } 901251881Speter else 902251881Speter { 903289180Speter *next = '\0'; 904289180Speter *str = next + 1; 905251881Speter } 906251881Speter 907251881Speter return token; 908251881Speter} 909251881Speter 910251881Speterint svn_cstring_count_newlines(const char *msg) 911251881Speter{ 912251881Speter int count = 0; 913251881Speter const char *p; 914251881Speter 915251881Speter for (p = msg; *p; p++) 916251881Speter { 917251881Speter if (*p == '\n') 918251881Speter { 919251881Speter count++; 920251881Speter if (*(p + 1) == '\r') 921251881Speter p++; 922251881Speter } 923251881Speter else if (*p == '\r') 924251881Speter { 925251881Speter count++; 926251881Speter if (*(p + 1) == '\n') 927251881Speter p++; 928251881Speter } 929251881Speter } 930251881Speter 931251881Speter return count; 932251881Speter} 933251881Speter 934251881Speterchar * 935251881Spetersvn_cstring_join(const apr_array_header_t *strings, 936251881Speter const char *separator, 937251881Speter apr_pool_t *pool) 938251881Speter{ 939251881Speter svn_stringbuf_t *new_str = svn_stringbuf_create_empty(pool); 940251881Speter size_t sep_len = strlen(separator); 941251881Speter int i; 942251881Speter 943251881Speter for (i = 0; i < strings->nelts; i++) 944251881Speter { 945251881Speter const char *string = APR_ARRAY_IDX(strings, i, const char *); 946251881Speter svn_stringbuf_appendbytes(new_str, string, strlen(string)); 947251881Speter svn_stringbuf_appendbytes(new_str, separator, sep_len); 948251881Speter } 949251881Speter return new_str->data; 950251881Speter} 951251881Speter 952251881Speterint 953251881Spetersvn_cstring_casecmp(const char *str1, const char *str2) 954251881Speter{ 955251881Speter for (;;) 956251881Speter { 957251881Speter const int a = *str1++; 958251881Speter const int b = *str2++; 959251881Speter const int cmp = svn_ctype_casecmp(a, b); 960251881Speter if (cmp || !a || !b) 961251881Speter return cmp; 962251881Speter } 963251881Speter} 964251881Speter 965251881Spetersvn_error_t * 966251881Spetersvn_cstring_strtoui64(apr_uint64_t *n, const char *str, 967251881Speter apr_uint64_t minval, apr_uint64_t maxval, 968251881Speter int base) 969251881Speter{ 970251881Speter apr_int64_t val; 971251881Speter char *endptr; 972251881Speter 973251881Speter /* We assume errno is thread-safe. */ 974251881Speter errno = 0; /* APR-0.9 doesn't always set errno */ 975251881Speter 976251881Speter /* ### We're throwing away half the number range here. 977251881Speter * ### APR needs a apr_strtoui64() function. */ 978251881Speter val = apr_strtoi64(str, &endptr, base); 979251881Speter if (errno == EINVAL || endptr == str || str[0] == '\0' || *endptr != '\0') 980251881Speter return svn_error_createf(SVN_ERR_INCORRECT_PARAMS, NULL, 981251881Speter _("Could not convert '%s' into a number"), 982251881Speter str); 983251881Speter if ((errno == ERANGE && (val == APR_INT64_MIN || val == APR_INT64_MAX)) || 984251881Speter val < 0 || (apr_uint64_t)val < minval || (apr_uint64_t)val > maxval) 985251881Speter /* ### Mark this for translation when gettext doesn't choke on macros. */ 986251881Speter return svn_error_createf(SVN_ERR_INCORRECT_PARAMS, NULL, 987251881Speter "Number '%s' is out of range " 988251881Speter "'[%" APR_UINT64_T_FMT ", %" APR_UINT64_T_FMT "]'", 989251881Speter str, minval, maxval); 990251881Speter *n = val; 991251881Speter return SVN_NO_ERROR; 992251881Speter} 993251881Speter 994251881Spetersvn_error_t * 995251881Spetersvn_cstring_atoui64(apr_uint64_t *n, const char *str) 996251881Speter{ 997251881Speter return svn_error_trace(svn_cstring_strtoui64(n, str, 0, 998251881Speter APR_UINT64_MAX, 10)); 999251881Speter} 1000251881Speter 1001251881Spetersvn_error_t * 1002251881Spetersvn_cstring_atoui(unsigned int *n, const char *str) 1003251881Speter{ 1004251881Speter apr_uint64_t val; 1005251881Speter 1006251881Speter SVN_ERR(svn_cstring_strtoui64(&val, str, 0, APR_UINT32_MAX, 10)); 1007251881Speter *n = (unsigned int)val; 1008251881Speter return SVN_NO_ERROR; 1009251881Speter} 1010251881Speter 1011251881Spetersvn_error_t * 1012251881Spetersvn_cstring_strtoi64(apr_int64_t *n, const char *str, 1013251881Speter apr_int64_t minval, apr_int64_t maxval, 1014251881Speter int base) 1015251881Speter{ 1016251881Speter apr_int64_t val; 1017251881Speter char *endptr; 1018251881Speter 1019251881Speter /* We assume errno is thread-safe. */ 1020251881Speter errno = 0; /* APR-0.9 doesn't always set errno */ 1021251881Speter 1022251881Speter val = apr_strtoi64(str, &endptr, base); 1023251881Speter if (errno == EINVAL || endptr == str || str[0] == '\0' || *endptr != '\0') 1024251881Speter return svn_error_createf(SVN_ERR_INCORRECT_PARAMS, NULL, 1025251881Speter _("Could not convert '%s' into a number"), 1026251881Speter str); 1027251881Speter if ((errno == ERANGE && (val == APR_INT64_MIN || val == APR_INT64_MAX)) || 1028251881Speter val < minval || val > maxval) 1029251881Speter /* ### Mark this for translation when gettext doesn't choke on macros. */ 1030251881Speter return svn_error_createf(SVN_ERR_INCORRECT_PARAMS, NULL, 1031251881Speter "Number '%s' is out of range " 1032251881Speter "'[%" APR_INT64_T_FMT ", %" APR_INT64_T_FMT "]'", 1033251881Speter str, minval, maxval); 1034251881Speter *n = val; 1035251881Speter return SVN_NO_ERROR; 1036251881Speter} 1037251881Speter 1038251881Spetersvn_error_t * 1039251881Spetersvn_cstring_atoi64(apr_int64_t *n, const char *str) 1040251881Speter{ 1041251881Speter return svn_error_trace(svn_cstring_strtoi64(n, str, APR_INT64_MIN, 1042251881Speter APR_INT64_MAX, 10)); 1043251881Speter} 1044251881Speter 1045251881Spetersvn_error_t * 1046251881Spetersvn_cstring_atoi(int *n, const char *str) 1047251881Speter{ 1048251881Speter apr_int64_t val; 1049251881Speter 1050251881Speter SVN_ERR(svn_cstring_strtoi64(&val, str, APR_INT32_MIN, APR_INT32_MAX, 10)); 1051251881Speter *n = (int)val; 1052251881Speter return SVN_NO_ERROR; 1053251881Speter} 1054251881Speter 1055289180Speterunsigned long 1056289180Spetersvn__strtoul(const char* buffer, const char** end) 1057289180Speter{ 1058289180Speter unsigned long result = 0; 1059251881Speter 1060289180Speter /* this loop will execute in just 2 CPU cycles, confirmed by measurement: 1061289180Speter 7 macro-ops (max 4 / cycle => 2 cycles) 1062289180Speter 1 load (max 1 / cycle) 1063289180Speter 1 jumps (compare + conditional jump == 1 macro op; max 1 / cycle) 1064289180Speter 2 arithmetic ops (subtract, increment; max 3 / cycle) 1065289180Speter 2 scale-and-add AGU ops (max 3 / cycle) 1066289180Speter 1 compiler-generated move operation 1067289180Speter dependency chain: temp = result * 4 + result; result = temp * 2 + c 1068289180Speter (2 ops with latency 1 => 2 cycles) 1069289180Speter */ 1070289180Speter while (1) 1071289180Speter { 1072289180Speter unsigned long c = (unsigned char)*buffer - (unsigned char)'0'; 1073289180Speter if (c > 9) 1074289180Speter break; 1075289180Speter 1076289180Speter result = result * 10 + c; 1077289180Speter ++buffer; 1078289180Speter } 1079289180Speter 1080289180Speter *end = buffer; 1081289180Speter return result; 1082251881Speter} 1083251881Speter 1084251881Speter/* "Precalculated" itoa values for 2 places (including leading zeros). 1085251881Speter * For maximum performance, make sure all table entries are word-aligned. 1086251881Speter */ 1087251881Speterstatic const char decimal_table[100][4] 1088251881Speter = { "00", "01", "02", "03", "04", "05", "06", "07", "08", "09" 1089251881Speter , "10", "11", "12", "13", "14", "15", "16", "17", "18", "19" 1090251881Speter , "20", "21", "22", "23", "24", "25", "26", "27", "28", "29" 1091251881Speter , "30", "31", "32", "33", "34", "35", "36", "37", "38", "39" 1092251881Speter , "40", "41", "42", "43", "44", "45", "46", "47", "48", "49" 1093251881Speter , "50", "51", "52", "53", "54", "55", "56", "57", "58", "59" 1094251881Speter , "60", "61", "62", "63", "64", "65", "66", "67", "68", "69" 1095251881Speter , "70", "71", "72", "73", "74", "75", "76", "77", "78", "79" 1096251881Speter , "80", "81", "82", "83", "84", "85", "86", "87", "88", "89" 1097251881Speter , "90", "91", "92", "93", "94", "95", "96", "97", "98", "99"}; 1098251881Speter 1099251881Speter/* Copy the two bytes at SOURCE[0] and SOURCE[1] to DEST[0] and DEST[1] */ 1100251881Speter#define COPY_TWO_BYTES(dest,source)\ 1101251881Speter memcpy((dest), (source), 2) 1102251881Speter 1103251881Speterapr_size_t 1104251881Spetersvn__ui64toa(char * dest, apr_uint64_t number) 1105251881Speter{ 1106251881Speter char buffer[SVN_INT64_BUFFER_SIZE]; 1107251881Speter apr_uint32_t reduced; /* used for 32 bit DIV */ 1108251881Speter char* target; 1109251881Speter 1110251881Speter /* Small numbers are by far the most common case. 1111251881Speter * Therefore, we use special code. 1112251881Speter */ 1113251881Speter if (number < 100) 1114251881Speter { 1115251881Speter if (number < 10) 1116251881Speter { 1117251881Speter dest[0] = (char)('0' + number); 1118251881Speter dest[1] = 0; 1119251881Speter return 1; 1120251881Speter } 1121251881Speter else 1122251881Speter { 1123251881Speter COPY_TWO_BYTES(dest, decimal_table[(apr_size_t)number]); 1124251881Speter dest[2] = 0; 1125251881Speter return 2; 1126251881Speter } 1127251881Speter } 1128251881Speter 1129251881Speter /* Standard code. Write string in pairs of chars back-to-front */ 1130251881Speter buffer[SVN_INT64_BUFFER_SIZE - 1] = 0; 1131251881Speter target = &buffer[SVN_INT64_BUFFER_SIZE - 3]; 1132251881Speter 1133251881Speter /* Loop may be executed 0 .. 2 times. */ 1134251881Speter while (number >= 100000000) 1135251881Speter { 1136251881Speter /* Number is larger than 100^4, i.e. we can write 4x2 chars. 1137251881Speter * Also, use 32 bit DIVs as these are about twice as fast. 1138251881Speter */ 1139251881Speter reduced = (apr_uint32_t)(number % 100000000); 1140251881Speter number /= 100000000; 1141251881Speter 1142251881Speter COPY_TWO_BYTES(target - 0, decimal_table[reduced % 100]); 1143251881Speter reduced /= 100; 1144251881Speter COPY_TWO_BYTES(target - 2, decimal_table[reduced % 100]); 1145251881Speter reduced /= 100; 1146251881Speter COPY_TWO_BYTES(target - 4, decimal_table[reduced % 100]); 1147251881Speter reduced /= 100; 1148251881Speter COPY_TWO_BYTES(target - 6, decimal_table[reduced % 100]); 1149251881Speter target -= 8; 1150251881Speter } 1151251881Speter 1152251881Speter /* Now, the number fits into 32 bits, but may still be larger than 99 */ 1153251881Speter reduced = (apr_uint32_t)(number); 1154251881Speter while (reduced >= 100) 1155251881Speter { 1156251881Speter COPY_TWO_BYTES(target, decimal_table[reduced % 100]); 1157251881Speter reduced /= 100; 1158251881Speter target -= 2; 1159251881Speter } 1160251881Speter 1161251881Speter /* The number is now smaller than 100 but larger than 1 */ 1162251881Speter COPY_TWO_BYTES(target, decimal_table[reduced]); 1163251881Speter 1164251881Speter /* Correction for uneven count of places. */ 1165251881Speter if (reduced < 10) 1166251881Speter ++target; 1167251881Speter 1168251881Speter /* Copy to target */ 1169251881Speter memcpy(dest, target, &buffer[SVN_INT64_BUFFER_SIZE] - target); 1170251881Speter return &buffer[SVN_INT64_BUFFER_SIZE] - target - 1; 1171251881Speter} 1172251881Speter 1173251881Speterapr_size_t 1174251881Spetersvn__i64toa(char * dest, apr_int64_t number) 1175251881Speter{ 1176251881Speter if (number >= 0) 1177251881Speter return svn__ui64toa(dest, (apr_uint64_t)number); 1178251881Speter 1179251881Speter *dest = '-'; 1180289180Speter return svn__ui64toa(dest + 1, 0 - (apr_uint64_t)number) + 1; 1181251881Speter} 1182251881Speter 1183251881Speterstatic void 1184289180Speterui64toa_sep(apr_uint64_t number, char separator, char *buffer) 1185251881Speter{ 1186251881Speter apr_size_t length = svn__ui64toa(buffer, number); 1187251881Speter apr_size_t i; 1188251881Speter 1189251881Speter for (i = length; i > 3; i -= 3) 1190251881Speter { 1191251881Speter memmove(&buffer[i - 2], &buffer[i - 3], length - i + 3); 1192289180Speter buffer[i-3] = separator; 1193251881Speter length++; 1194251881Speter } 1195251881Speter 1196251881Speter buffer[length] = 0; 1197251881Speter} 1198251881Speter 1199251881Speterchar * 1200289180Spetersvn__ui64toa_sep(apr_uint64_t number, char separator, apr_pool_t *pool) 1201251881Speter{ 1202251881Speter char buffer[2 * SVN_INT64_BUFFER_SIZE]; 1203289180Speter ui64toa_sep(number, separator, buffer); 1204251881Speter 1205251881Speter return apr_pstrdup(pool, buffer); 1206251881Speter} 1207251881Speter 1208251881Speterchar * 1209289180Spetersvn__i64toa_sep(apr_int64_t number, char separator, apr_pool_t *pool) 1210251881Speter{ 1211251881Speter char buffer[2 * SVN_INT64_BUFFER_SIZE]; 1212251881Speter if (number < 0) 1213251881Speter { 1214251881Speter buffer[0] = '-'; 1215289180Speter ui64toa_sep((apr_uint64_t)(-number), separator, &buffer[1]); 1216251881Speter } 1217251881Speter else 1218289180Speter ui64toa_sep((apr_uint64_t)(number), separator, buffer); 1219251881Speter 1220251881Speter return apr_pstrdup(pool, buffer); 1221251881Speter} 1222251881Speter 1223289180Speterapr_size_t 1224289180Spetersvn__ui64tobase36(char *dest, apr_uint64_t value) 1225289180Speter{ 1226289180Speter char *dest_start = dest; 1227289180Speter if (value < 10) 1228289180Speter { 1229289180Speter /* pretty frequent and trivial case. Make it fast. */ 1230289180Speter *(dest++) = (char)(value) + '0'; 1231289180Speter } 1232289180Speter else 1233289180Speter { 1234289180Speter char buffer[SVN_INT64_BUFFER_SIZE]; 1235289180Speter char *p = buffer; 1236289180Speter 1237289180Speter /* write result as little-endian to buffer */ 1238289180Speter while (value > 0) 1239289180Speter { 1240289180Speter char c = (char)(value % 36); 1241289180Speter value /= 36; 1242289180Speter 1243289180Speter *p = (c <= 9) ? (c + '0') : (c - 10 + 'a'); 1244289180Speter ++p; 1245289180Speter } 1246289180Speter 1247289180Speter /* copy as big-endian to DEST */ 1248289180Speter while (p > buffer) 1249289180Speter *(dest++) = *(--p); 1250289180Speter } 1251289180Speter 1252289180Speter *dest = '\0'; 1253289180Speter return dest - dest_start; 1254289180Speter} 1255289180Speter 1256289180Speterapr_uint64_t 1257289180Spetersvn__base36toui64(const char **next, const char *source) 1258289180Speter{ 1259289180Speter apr_uint64_t result = 0; 1260289180Speter apr_uint64_t factor = 1; 1261289180Speter int i = 0; 1262289180Speter char digits[SVN_INT64_BUFFER_SIZE]; 1263289180Speter 1264289180Speter /* convert digits to numerical values and count the number of places. 1265289180Speter * Also, prevent buffer overflow. */ 1266289180Speter while (i < sizeof(digits)) 1267289180Speter { 1268289180Speter char c = *source; 1269289180Speter if (c < 'a') 1270289180Speter { 1271289180Speter /* includes detection of NUL terminator */ 1272289180Speter if (c < '0' || c > '9') 1273289180Speter break; 1274289180Speter 1275289180Speter c -= '0'; 1276289180Speter } 1277289180Speter else 1278289180Speter { 1279289180Speter if (c < 'a' || c > 'z') 1280289180Speter break; 1281289180Speter 1282289180Speter c -= 'a' - 10; 1283289180Speter } 1284289180Speter 1285289180Speter digits[i++] = c; 1286289180Speter source++; 1287289180Speter } 1288289180Speter 1289289180Speter /* fold digits into the result */ 1290289180Speter while (i > 0) 1291289180Speter { 1292289180Speter result += factor * (apr_uint64_t)digits[--i]; 1293289180Speter factor *= 36; 1294289180Speter } 1295289180Speter 1296289180Speter if (next) 1297289180Speter *next = source; 1298289180Speter 1299289180Speter return result; 1300289180Speter} 1301289180Speter 1302289180Speter 1303289180Speterapr_size_t 1304251881Spetersvn_cstring__similarity(const char *stra, const char *strb, 1305251881Speter svn_membuf_t *buffer, apr_size_t *rlcs) 1306251881Speter{ 1307251881Speter svn_string_t stringa, stringb; 1308251881Speter stringa.data = stra; 1309251881Speter stringa.len = strlen(stra); 1310251881Speter stringb.data = strb; 1311251881Speter stringb.len = strlen(strb); 1312251881Speter return svn_string__similarity(&stringa, &stringb, buffer, rlcs); 1313251881Speter} 1314251881Speter 1315289180Speterapr_size_t 1316251881Spetersvn_string__similarity(const svn_string_t *stringa, 1317251881Speter const svn_string_t *stringb, 1318251881Speter svn_membuf_t *buffer, apr_size_t *rlcs) 1319251881Speter{ 1320251881Speter const char *stra = stringa->data; 1321251881Speter const char *strb = stringb->data; 1322251881Speter const apr_size_t lena = stringa->len; 1323251881Speter const apr_size_t lenb = stringb->len; 1324251881Speter const apr_size_t total = lena + lenb; 1325251881Speter const char *enda = stra + lena; 1326251881Speter const char *endb = strb + lenb; 1327251881Speter apr_size_t lcs = 0; 1328251881Speter 1329251881Speter /* Skip the common prefix ... */ 1330251881Speter while (stra < enda && strb < endb && *stra == *strb) 1331251881Speter { 1332251881Speter ++stra; ++strb; 1333251881Speter ++lcs; 1334251881Speter } 1335251881Speter 1336251881Speter /* ... and the common suffix */ 1337251881Speter while (stra < enda && strb < endb) 1338251881Speter { 1339251881Speter --enda; --endb; 1340251881Speter if (*enda != *endb) 1341251881Speter { 1342251881Speter ++enda; ++endb; 1343251881Speter break; 1344251881Speter } 1345251881Speter 1346251881Speter ++lcs; 1347251881Speter } 1348251881Speter 1349251881Speter if (stra < enda && strb < endb) 1350251881Speter { 1351251881Speter const apr_size_t resta = enda - stra; 1352251881Speter const apr_size_t restb = endb - strb; 1353251881Speter const apr_size_t slots = (resta > restb ? restb : resta); 1354251881Speter apr_size_t *curr, *prev; 1355251881Speter const char *pstr; 1356251881Speter 1357251881Speter /* The outer loop must iterate on the longer string. */ 1358251881Speter if (resta < restb) 1359251881Speter { 1360251881Speter pstr = stra; 1361251881Speter stra = strb; 1362251881Speter strb = pstr; 1363251881Speter 1364251881Speter pstr = enda; 1365251881Speter enda = endb; 1366251881Speter endb = pstr; 1367251881Speter } 1368251881Speter 1369251881Speter /* Allocate two columns in the LCS matrix 1370251881Speter ### Optimize this to (slots + 2) instesd of 2 * (slots + 1) */ 1371251881Speter svn_membuf__ensure(buffer, 2 * (slots + 1) * sizeof(apr_size_t)); 1372251881Speter svn_membuf__nzero(buffer, (slots + 2) * sizeof(apr_size_t)); 1373251881Speter prev = buffer->data; 1374251881Speter curr = prev + slots + 1; 1375251881Speter 1376251881Speter /* Calculate LCS length of the remainder */ 1377251881Speter for (pstr = stra; pstr < enda; ++pstr) 1378251881Speter { 1379289180Speter apr_size_t i; 1380251881Speter for (i = 1; i <= slots; ++i) 1381251881Speter { 1382251881Speter if (*pstr == strb[i-1]) 1383251881Speter curr[i] = prev[i-1] + 1; 1384251881Speter else 1385251881Speter curr[i] = (curr[i-1] > prev[i] ? curr[i-1] : prev[i]); 1386251881Speter } 1387251881Speter 1388251881Speter /* Swap the buffers, making the previous one current */ 1389251881Speter { 1390251881Speter apr_size_t *const temp = prev; 1391251881Speter prev = curr; 1392251881Speter curr = temp; 1393251881Speter } 1394251881Speter } 1395251881Speter 1396251881Speter lcs += prev[slots]; 1397251881Speter } 1398251881Speter 1399251881Speter if (rlcs) 1400251881Speter *rlcs = lcs; 1401251881Speter 1402251881Speter /* Return similarity ratio rounded to 4 significant digits */ 1403251881Speter if (total) 1404289180Speter return ((2 * SVN_STRING__SIM_RANGE_MAX * lcs + total/2) / total); 1405251881Speter else 1406289180Speter return SVN_STRING__SIM_RANGE_MAX; 1407251881Speter} 1408289180Speter 1409289180Speterapr_size_t 1410289180Spetersvn_cstring__match_length(const char *a, 1411289180Speter const char *b, 1412289180Speter apr_size_t max_len) 1413289180Speter{ 1414289180Speter apr_size_t pos = 0; 1415289180Speter 1416289180Speter#if SVN_UNALIGNED_ACCESS_IS_OK 1417289180Speter 1418289180Speter /* Chunky processing is so much faster ... 1419289180Speter * 1420289180Speter * We can't make this work on architectures that require aligned access 1421289180Speter * because A and B will probably have different alignment. So, skipping 1422289180Speter * the first few chars until alignment is reached is not an option. 1423289180Speter */ 1424289180Speter for (; pos + sizeof(apr_size_t) <= max_len; pos += sizeof(apr_size_t)) 1425289180Speter if (*(const apr_size_t*)(a + pos) != *(const apr_size_t*)(b + pos)) 1426289180Speter break; 1427289180Speter 1428289180Speter#endif 1429289180Speter 1430289180Speter for (; pos < max_len; ++pos) 1431289180Speter if (a[pos] != b[pos]) 1432289180Speter break; 1433289180Speter 1434289180Speter return pos; 1435289180Speter} 1436289180Speter 1437289180Speterapr_size_t 1438289180Spetersvn_cstring__reverse_match_length(const char *a, 1439289180Speter const char *b, 1440289180Speter apr_size_t max_len) 1441289180Speter{ 1442289180Speter apr_size_t pos = 0; 1443289180Speter 1444289180Speter#if SVN_UNALIGNED_ACCESS_IS_OK 1445289180Speter 1446289180Speter /* Chunky processing is so much faster ... 1447289180Speter * 1448289180Speter * We can't make this work on architectures that require aligned access 1449289180Speter * because A and B will probably have different alignment. So, skipping 1450289180Speter * the first few chars until alignment is reached is not an option. 1451289180Speter */ 1452289180Speter for (pos = sizeof(apr_size_t); pos <= max_len; pos += sizeof(apr_size_t)) 1453289180Speter if (*(const apr_size_t*)(a - pos) != *(const apr_size_t*)(b - pos)) 1454289180Speter break; 1455289180Speter 1456289180Speter pos -= sizeof(apr_size_t); 1457289180Speter 1458289180Speter#endif 1459289180Speter 1460289180Speter /* If we find a mismatch at -pos, pos-1 characters matched. 1461289180Speter */ 1462289180Speter while (++pos <= max_len) 1463289180Speter if (a[0-pos] != b[0-pos]) 1464289180Speter return pos - 1; 1465289180Speter 1466289180Speter /* No mismatch found -> at least MAX_LEN matching chars. 1467289180Speter */ 1468289180Speter return max_len; 1469289180Speter} 1470289180Speter 1471289180Speterconst char * 1472289180Spetersvn_cstring_skip_prefix(const char *str, const char *prefix) 1473289180Speter{ 1474289180Speter apr_size_t len = strlen(prefix); 1475289180Speter 1476289180Speter if (strncmp(str, prefix, len) == 0) 1477289180Speter { 1478289180Speter return str + len; 1479289180Speter } 1480289180Speter else 1481289180Speter { 1482289180Speter return NULL; 1483289180Speter } 1484289180Speter} 1485