| File: | src/sds.c |
| Warning: | line 751, column 10 Although the value stored to 'start' is used in the enclosing expression, the value is never actually read from 'start' |
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| 1 | /* SDSLib 2.0 -- A C dynamic strings library |
| 2 | * |
| 3 | * Copyright (c) 2006-2015, Salvatore Sanfilippo <antirez at gmail dot com> |
| 4 | * Copyright (c) 2015, Oran Agra |
| 5 | * Copyright (c) 2015, Redis Labs, Inc |
| 6 | * All rights reserved. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions are met: |
| 10 | * |
| 11 | * * Redistributions of source code must retain the above copyright notice, |
| 12 | * this list of conditions and the following disclaimer. |
| 13 | * * Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in the |
| 15 | * documentation and/or other materials provided with the distribution. |
| 16 | * * Neither the name of Redis nor the names of its contributors may be used |
| 17 | * to endorse or promote products derived from this software without |
| 18 | * specific prior written permission. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| 21 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 22 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 23 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| 24 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 25 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 26 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 27 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 28 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 29 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 30 | * POSSIBILITY OF SUCH DAMAGE. |
| 31 | */ |
| 32 | |
| 33 | #include <stdio.h> |
| 34 | #include <stdlib.h> |
| 35 | #include <string.h> |
| 36 | #include <ctype.h> |
| 37 | #include <assert.h> |
| 38 | #include <limits.h> |
| 39 | #include "sds.h" |
| 40 | #include "sdsalloc.h" |
| 41 | |
| 42 | const char *SDS_NOINIT = "SDS_NOINIT"; |
| 43 | |
| 44 | static inline int sdsHdrSize(char type) { |
| 45 | switch(type&SDS_TYPE_MASK7) { |
| 46 | case SDS_TYPE_50: |
| 47 | return sizeof(struct sdshdr5); |
| 48 | case SDS_TYPE_81: |
| 49 | return sizeof(struct sdshdr8); |
| 50 | case SDS_TYPE_162: |
| 51 | return sizeof(struct sdshdr16); |
| 52 | case SDS_TYPE_323: |
| 53 | return sizeof(struct sdshdr32); |
| 54 | case SDS_TYPE_644: |
| 55 | return sizeof(struct sdshdr64); |
| 56 | } |
| 57 | return 0; |
| 58 | } |
| 59 | |
| 60 | static inline char sdsReqType(size_t string_size) { |
| 61 | if (string_size < 1<<5) |
| 62 | return SDS_TYPE_50; |
| 63 | if (string_size < 1<<8) |
| 64 | return SDS_TYPE_81; |
| 65 | if (string_size < 1<<16) |
| 66 | return SDS_TYPE_162; |
| 67 | #if (LONG_MAX9223372036854775807L == LLONG_MAX9223372036854775807LL) |
| 68 | if (string_size < 1ll<<32) |
| 69 | return SDS_TYPE_323; |
| 70 | return SDS_TYPE_644; |
| 71 | #else |
| 72 | return SDS_TYPE_323; |
| 73 | #endif |
| 74 | } |
| 75 | |
| 76 | static inline size_t sdsTypeMaxSize(char type) { |
| 77 | if (type == SDS_TYPE_50) |
| 78 | return (1<<5) - 1; |
| 79 | if (type == SDS_TYPE_81) |
| 80 | return (1<<8) - 1; |
| 81 | if (type == SDS_TYPE_162) |
| 82 | return (1<<16) - 1; |
| 83 | #if (LONG_MAX9223372036854775807L == LLONG_MAX9223372036854775807LL) |
| 84 | if (type == SDS_TYPE_323) |
| 85 | return (1ll<<32) - 1; |
| 86 | #endif |
| 87 | return -1; /* this is equivalent to the max SDS_TYPE_64 or SDS_TYPE_32 */ |
| 88 | } |
| 89 | |
| 90 | /* Create a new sds string with the content specified by the 'init' pointer |
| 91 | * and 'initlen'. |
| 92 | * If NULL is used for 'init' the string is initialized with zero bytes. |
| 93 | * If SDS_NOINIT is used, the buffer is left uninitialized; |
| 94 | * |
| 95 | * The string is always null-termined (all the sds strings are, always) so |
| 96 | * even if you create an sds string with: |
| 97 | * |
| 98 | * mystring = sdsnewlen("abc",3); |
| 99 | * |
| 100 | * You can print the string with printf() as there is an implicit \0 at the |
| 101 | * end of the string. However the string is binary safe and can contain |
| 102 | * \0 characters in the middle, as the length is stored in the sds header. */ |
| 103 | sds _sdsnewlen(const void *init, size_t initlen, int trymalloc) { |
| 104 | void *sh; |
| 105 | sds s; |
| 106 | char type = sdsReqType(initlen); |
| 107 | /* Empty strings are usually created in order to append. Use type 8 |
| 108 | * since type 5 is not good at this. */ |
| 109 | if (type == SDS_TYPE_50 && initlen == 0) type = SDS_TYPE_81; |
| 110 | int hdrlen = sdsHdrSize(type); |
| 111 | unsigned char *fp; /* flags pointer. */ |
| 112 | size_t usable; |
| 113 | |
| 114 | assert(initlen + hdrlen + 1 > initlen)((initlen + hdrlen + 1 > initlen) ? (void) (0) : __assert_fail ("initlen + hdrlen + 1 > initlen", "sds.c", 114, __extension__ __PRETTY_FUNCTION__)); /* Catch size_t overflow */ |
| 115 | sh = trymalloc? |
| 116 | s_trymalloc_usableztrymalloc_usable(hdrlen+initlen+1, &usable) : |
| 117 | s_malloc_usablezmalloc_usable(hdrlen+initlen+1, &usable); |
| 118 | if (sh == NULL((void*)0)) return NULL((void*)0); |
| 119 | if (init==SDS_NOINIT) |
| 120 | init = NULL((void*)0); |
| 121 | else if (!init) |
| 122 | memset(sh, 0, hdrlen+initlen+1); |
| 123 | s = (char*)sh+hdrlen; |
| 124 | fp = ((unsigned char*)s)-1; |
| 125 | usable = usable-hdrlen-1; |
| 126 | if (usable > sdsTypeMaxSize(type)) |
| 127 | usable = sdsTypeMaxSize(type); |
| 128 | switch(type) { |
| 129 | case SDS_TYPE_50: { |
| 130 | *fp = type | (initlen << SDS_TYPE_BITS3); |
| 131 | break; |
| 132 | } |
| 133 | case SDS_TYPE_81: { |
| 134 | SDS_HDR_VAR(8,s)struct sdshdr8 *sh = (void*)((s)-(sizeof(struct sdshdr8)));; |
| 135 | sh->len = initlen; |
| 136 | sh->alloc = usable; |
| 137 | *fp = type; |
| 138 | break; |
| 139 | } |
| 140 | case SDS_TYPE_162: { |
| 141 | SDS_HDR_VAR(16,s)struct sdshdr16 *sh = (void*)((s)-(sizeof(struct sdshdr16)));; |
| 142 | sh->len = initlen; |
| 143 | sh->alloc = usable; |
| 144 | *fp = type; |
| 145 | break; |
| 146 | } |
| 147 | case SDS_TYPE_323: { |
| 148 | SDS_HDR_VAR(32,s)struct sdshdr32 *sh = (void*)((s)-(sizeof(struct sdshdr32)));; |
| 149 | sh->len = initlen; |
| 150 | sh->alloc = usable; |
| 151 | *fp = type; |
| 152 | break; |
| 153 | } |
| 154 | case SDS_TYPE_644: { |
| 155 | SDS_HDR_VAR(64,s)struct sdshdr64 *sh = (void*)((s)-(sizeof(struct sdshdr64)));; |
| 156 | sh->len = initlen; |
| 157 | sh->alloc = usable; |
| 158 | *fp = type; |
| 159 | break; |
| 160 | } |
| 161 | } |
| 162 | if (initlen && init) |
| 163 | memcpy(s, init, initlen); |
| 164 | s[initlen] = '\0'; |
| 165 | return s; |
| 166 | } |
| 167 | |
| 168 | sds sdsnewlen(const void *init, size_t initlen) { |
| 169 | return _sdsnewlen(init, initlen, 0); |
| 170 | } |
| 171 | |
| 172 | sds sdstrynewlen(const void *init, size_t initlen) { |
| 173 | return _sdsnewlen(init, initlen, 1); |
| 174 | } |
| 175 | |
| 176 | /* Create an empty (zero length) sds string. Even in this case the string |
| 177 | * always has an implicit null term. */ |
| 178 | sds sdsempty(void) { |
| 179 | return sdsnewlen("",0); |
| 180 | } |
| 181 | |
| 182 | /* Create a new sds string starting from a null terminated C string. */ |
| 183 | sds sdsnew(const char *init) { |
| 184 | size_t initlen = (init == NULL((void*)0)) ? 0 : strlen(init); |
| 185 | return sdsnewlen(init, initlen); |
| 186 | } |
| 187 | |
| 188 | /* Duplicate an sds string. */ |
| 189 | sds sdsdup(const sds s) { |
| 190 | return sdsnewlen(s, sdslen(s)); |
| 191 | } |
| 192 | |
| 193 | /* Free an sds string. No operation is performed if 's' is NULL. */ |
| 194 | void sdsfree(sds s) { |
| 195 | if (s == NULL((void*)0)) return; |
| 196 | s_freezfree((char*)s-sdsHdrSize(s[-1])); |
| 197 | } |
| 198 | |
| 199 | /* Set the sds string length to the length as obtained with strlen(), so |
| 200 | * considering as content only up to the first null term character. |
| 201 | * |
| 202 | * This function is useful when the sds string is hacked manually in some |
| 203 | * way, like in the following example: |
| 204 | * |
| 205 | * s = sdsnew("foobar"); |
| 206 | * s[2] = '\0'; |
| 207 | * sdsupdatelen(s); |
| 208 | * printf("%d\n", sdslen(s)); |
| 209 | * |
| 210 | * The output will be "2", but if we comment out the call to sdsupdatelen() |
| 211 | * the output will be "6" as the string was modified but the logical length |
| 212 | * remains 6 bytes. */ |
| 213 | void sdsupdatelen(sds s) { |
| 214 | size_t reallen = strlen(s); |
| 215 | sdssetlen(s, reallen); |
| 216 | } |
| 217 | |
| 218 | /* Modify an sds string in-place to make it empty (zero length). |
| 219 | * However all the existing buffer is not discarded but set as free space |
| 220 | * so that next append operations will not require allocations up to the |
| 221 | * number of bytes previously available. */ |
| 222 | void sdsclear(sds s) { |
| 223 | sdssetlen(s, 0); |
| 224 | s[0] = '\0'; |
| 225 | } |
| 226 | |
| 227 | /* Enlarge the free space at the end of the sds string so that the caller |
| 228 | * is sure that after calling this function can overwrite up to addlen |
| 229 | * bytes after the end of the string, plus one more byte for nul term. |
| 230 | * |
| 231 | * Note: this does not change the *length* of the sds string as returned |
| 232 | * by sdslen(), but only the free buffer space we have. */ |
| 233 | sds sdsMakeRoomFor(sds s, size_t addlen) { |
| 234 | void *sh, *newsh; |
| 235 | size_t avail = sdsavail(s); |
| 236 | size_t len, newlen; |
| 237 | char type, oldtype = s[-1] & SDS_TYPE_MASK7; |
| 238 | int hdrlen; |
| 239 | size_t usable; |
| 240 | |
| 241 | /* Return ASAP if there is enough space left. */ |
| 242 | if (avail >= addlen) return s; |
| 243 | |
| 244 | len = sdslen(s); |
| 245 | sh = (char*)s-sdsHdrSize(oldtype); |
| 246 | newlen = (len+addlen); |
| 247 | assert(newlen > len)((newlen > len) ? (void) (0) : __assert_fail ("newlen > len" , "sds.c", 247, __extension__ __PRETTY_FUNCTION__)); /* Catch size_t overflow */ |
| 248 | if (newlen < SDS_MAX_PREALLOC(1024*1024)) |
| 249 | newlen *= 2; |
| 250 | else |
| 251 | newlen += SDS_MAX_PREALLOC(1024*1024); |
| 252 | |
| 253 | type = sdsReqType(newlen); |
| 254 | |
| 255 | /* Don't use type 5: the user is appending to the string and type 5 is |
| 256 | * not able to remember empty space, so sdsMakeRoomFor() must be called |
| 257 | * at every appending operation. */ |
| 258 | if (type == SDS_TYPE_50) type = SDS_TYPE_81; |
| 259 | |
| 260 | hdrlen = sdsHdrSize(type); |
| 261 | assert(hdrlen + newlen + 1 > len)((hdrlen + newlen + 1 > len) ? (void) (0) : __assert_fail ( "hdrlen + newlen + 1 > len", "sds.c", 261, __extension__ __PRETTY_FUNCTION__ )); /* Catch size_t overflow */ |
| 262 | if (oldtype==type) { |
| 263 | newsh = s_realloc_usablezrealloc_usable(sh, hdrlen+newlen+1, &usable); |
| 264 | if (newsh == NULL((void*)0)) return NULL((void*)0); |
| 265 | s = (char*)newsh+hdrlen; |
| 266 | } else { |
| 267 | /* Since the header size changes, need to move the string forward, |
| 268 | * and can't use realloc */ |
| 269 | newsh = s_malloc_usablezmalloc_usable(hdrlen+newlen+1, &usable); |
| 270 | if (newsh == NULL((void*)0)) return NULL((void*)0); |
| 271 | memcpy((char*)newsh+hdrlen, s, len+1); |
| 272 | s_freezfree(sh); |
| 273 | s = (char*)newsh+hdrlen; |
| 274 | s[-1] = type; |
| 275 | sdssetlen(s, len); |
| 276 | } |
| 277 | usable = usable-hdrlen-1; |
| 278 | if (usable > sdsTypeMaxSize(type)) |
| 279 | usable = sdsTypeMaxSize(type); |
| 280 | sdssetalloc(s, usable); |
| 281 | return s; |
| 282 | } |
| 283 | |
| 284 | /* Reallocate the sds string so that it has no free space at the end. The |
| 285 | * contained string remains not altered, but next concatenation operations |
| 286 | * will require a reallocation. |
| 287 | * |
| 288 | * After the call, the passed sds string is no longer valid and all the |
| 289 | * references must be substituted with the new pointer returned by the call. */ |
| 290 | sds sdsRemoveFreeSpace(sds s) { |
| 291 | void *sh, *newsh; |
| 292 | char type, oldtype = s[-1] & SDS_TYPE_MASK7; |
| 293 | int hdrlen, oldhdrlen = sdsHdrSize(oldtype); |
| 294 | size_t len = sdslen(s); |
| 295 | size_t avail = sdsavail(s); |
| 296 | sh = (char*)s-oldhdrlen; |
| 297 | |
| 298 | /* Return ASAP if there is no space left. */ |
| 299 | if (avail == 0) return s; |
| 300 | |
| 301 | /* Check what would be the minimum SDS header that is just good enough to |
| 302 | * fit this string. */ |
| 303 | type = sdsReqType(len); |
| 304 | hdrlen = sdsHdrSize(type); |
| 305 | |
| 306 | /* If the type is the same, or at least a large enough type is still |
| 307 | * required, we just realloc(), letting the allocator to do the copy |
| 308 | * only if really needed. Otherwise if the change is huge, we manually |
| 309 | * reallocate the string to use the different header type. */ |
| 310 | if (oldtype==type || type > SDS_TYPE_81) { |
| 311 | newsh = s_realloczrealloc(sh, oldhdrlen+len+1); |
| 312 | if (newsh == NULL((void*)0)) return NULL((void*)0); |
| 313 | s = (char*)newsh+oldhdrlen; |
| 314 | } else { |
| 315 | newsh = s_malloczmalloc(hdrlen+len+1); |
| 316 | if (newsh == NULL((void*)0)) return NULL((void*)0); |
| 317 | memcpy((char*)newsh+hdrlen, s, len+1); |
| 318 | s_freezfree(sh); |
| 319 | s = (char*)newsh+hdrlen; |
| 320 | s[-1] = type; |
| 321 | sdssetlen(s, len); |
| 322 | } |
| 323 | sdssetalloc(s, len); |
| 324 | return s; |
| 325 | } |
| 326 | |
| 327 | /* Return the total size of the allocation of the specified sds string, |
| 328 | * including: |
| 329 | * 1) The sds header before the pointer. |
| 330 | * 2) The string. |
| 331 | * 3) The free buffer at the end if any. |
| 332 | * 4) The implicit null term. |
| 333 | */ |
| 334 | size_t sdsAllocSize(sds s) { |
| 335 | size_t alloc = sdsalloc(s); |
| 336 | return sdsHdrSize(s[-1])+alloc+1; |
| 337 | } |
| 338 | |
| 339 | /* Return the pointer of the actual SDS allocation (normally SDS strings |
| 340 | * are referenced by the start of the string buffer). */ |
| 341 | void *sdsAllocPtr(sds s) { |
| 342 | return (void*) (s-sdsHdrSize(s[-1])); |
| 343 | } |
| 344 | |
| 345 | /* Increment the sds length and decrements the left free space at the |
| 346 | * end of the string according to 'incr'. Also set the null term |
| 347 | * in the new end of the string. |
| 348 | * |
| 349 | * This function is used in order to fix the string length after the |
| 350 | * user calls sdsMakeRoomFor(), writes something after the end of |
| 351 | * the current string, and finally needs to set the new length. |
| 352 | * |
| 353 | * Note: it is possible to use a negative increment in order to |
| 354 | * right-trim the string. |
| 355 | * |
| 356 | * Usage example: |
| 357 | * |
| 358 | * Using sdsIncrLen() and sdsMakeRoomFor() it is possible to mount the |
| 359 | * following schema, to cat bytes coming from the kernel to the end of an |
| 360 | * sds string without copying into an intermediate buffer: |
| 361 | * |
| 362 | * oldlen = sdslen(s); |
| 363 | * s = sdsMakeRoomFor(s, BUFFER_SIZE); |
| 364 | * nread = read(fd, s+oldlen, BUFFER_SIZE); |
| 365 | * ... check for nread <= 0 and handle it ... |
| 366 | * sdsIncrLen(s, nread); |
| 367 | */ |
| 368 | void sdsIncrLen(sds s, ssize_t incr) { |
| 369 | unsigned char flags = s[-1]; |
| 370 | size_t len; |
| 371 | switch(flags&SDS_TYPE_MASK7) { |
| 372 | case SDS_TYPE_50: { |
| 373 | unsigned char *fp = ((unsigned char*)s)-1; |
| 374 | unsigned char oldlen = SDS_TYPE_5_LEN(flags)((flags)>>3); |
| 375 | assert((incr > 0 && oldlen+incr < 32) || (incr < 0 && oldlen >= (unsigned int)(-incr)))(((incr > 0 && oldlen+incr < 32) || (incr < 0 && oldlen >= (unsigned int)(-incr))) ? (void) (0) : __assert_fail ("(incr > 0 && oldlen+incr < 32) || (incr < 0 && oldlen >= (unsigned int)(-incr))" , "sds.c", 375, __extension__ __PRETTY_FUNCTION__)); |
| 376 | *fp = SDS_TYPE_50 | ((oldlen+incr) << SDS_TYPE_BITS3); |
| 377 | len = oldlen+incr; |
| 378 | break; |
| 379 | } |
| 380 | case SDS_TYPE_81: { |
| 381 | SDS_HDR_VAR(8,s)struct sdshdr8 *sh = (void*)((s)-(sizeof(struct sdshdr8)));; |
| 382 | assert((incr >= 0 && sh->alloc-sh->len >= incr) || (incr < 0 && sh->len >= (unsigned int)(-incr)))(((incr >= 0 && sh->alloc-sh->len >= incr ) || (incr < 0 && sh->len >= (unsigned int)( -incr))) ? (void) (0) : __assert_fail ("(incr >= 0 && sh->alloc-sh->len >= incr) || (incr < 0 && sh->len >= (unsigned int)(-incr))" , "sds.c", 382, __extension__ __PRETTY_FUNCTION__)); |
| 383 | len = (sh->len += incr); |
| 384 | break; |
| 385 | } |
| 386 | case SDS_TYPE_162: { |
| 387 | SDS_HDR_VAR(16,s)struct sdshdr16 *sh = (void*)((s)-(sizeof(struct sdshdr16)));; |
| 388 | assert((incr >= 0 && sh->alloc-sh->len >= incr) || (incr < 0 && sh->len >= (unsigned int)(-incr)))(((incr >= 0 && sh->alloc-sh->len >= incr ) || (incr < 0 && sh->len >= (unsigned int)( -incr))) ? (void) (0) : __assert_fail ("(incr >= 0 && sh->alloc-sh->len >= incr) || (incr < 0 && sh->len >= (unsigned int)(-incr))" , "sds.c", 388, __extension__ __PRETTY_FUNCTION__)); |
| 389 | len = (sh->len += incr); |
| 390 | break; |
| 391 | } |
| 392 | case SDS_TYPE_323: { |
| 393 | SDS_HDR_VAR(32,s)struct sdshdr32 *sh = (void*)((s)-(sizeof(struct sdshdr32)));; |
| 394 | assert((incr >= 0 && sh->alloc-sh->len >= (unsigned int)incr) || (incr < 0 && sh->len >= (unsigned int)(-incr)))(((incr >= 0 && sh->alloc-sh->len >= (unsigned int)incr) || (incr < 0 && sh->len >= (unsigned int)(-incr))) ? (void) (0) : __assert_fail ("(incr >= 0 && sh->alloc-sh->len >= (unsigned int)incr) || (incr < 0 && sh->len >= (unsigned int)(-incr))" , "sds.c", 394, __extension__ __PRETTY_FUNCTION__)); |
| 395 | len = (sh->len += incr); |
| 396 | break; |
| 397 | } |
| 398 | case SDS_TYPE_644: { |
| 399 | SDS_HDR_VAR(64,s)struct sdshdr64 *sh = (void*)((s)-(sizeof(struct sdshdr64)));; |
| 400 | assert((incr >= 0 && sh->alloc-sh->len >= (uint64_t)incr) || (incr < 0 && sh->len >= (uint64_t)(-incr)))(((incr >= 0 && sh->alloc-sh->len >= (uint64_t )incr) || (incr < 0 && sh->len >= (uint64_t) (-incr))) ? (void) (0) : __assert_fail ("(incr >= 0 && sh->alloc-sh->len >= (uint64_t)incr) || (incr < 0 && sh->len >= (uint64_t)(-incr))" , "sds.c", 400, __extension__ __PRETTY_FUNCTION__)); |
| 401 | len = (sh->len += incr); |
| 402 | break; |
| 403 | } |
| 404 | default: len = 0; /* Just to avoid compilation warnings. */ |
| 405 | } |
| 406 | s[len] = '\0'; |
| 407 | } |
| 408 | |
| 409 | /* Grow the sds to have the specified length. Bytes that were not part of |
| 410 | * the original length of the sds will be set to zero. |
| 411 | * |
| 412 | * if the specified length is smaller than the current length, no operation |
| 413 | * is performed. */ |
| 414 | sds sdsgrowzero(sds s, size_t len) { |
| 415 | size_t curlen = sdslen(s); |
| 416 | |
| 417 | if (len <= curlen) return s; |
| 418 | s = sdsMakeRoomFor(s,len-curlen); |
| 419 | if (s == NULL((void*)0)) return NULL((void*)0); |
| 420 | |
| 421 | /* Make sure added region doesn't contain garbage */ |
| 422 | memset(s+curlen,0,(len-curlen+1)); /* also set trailing \0 byte */ |
| 423 | sdssetlen(s, len); |
| 424 | return s; |
| 425 | } |
| 426 | |
| 427 | /* Append the specified binary-safe string pointed by 't' of 'len' bytes to the |
| 428 | * end of the specified sds string 's'. |
| 429 | * |
| 430 | * After the call, the passed sds string is no longer valid and all the |
| 431 | * references must be substituted with the new pointer returned by the call. */ |
| 432 | sds sdscatlen(sds s, const void *t, size_t len) { |
| 433 | size_t curlen = sdslen(s); |
| 434 | |
| 435 | s = sdsMakeRoomFor(s,len); |
| 436 | if (s == NULL((void*)0)) return NULL((void*)0); |
| 437 | memcpy(s+curlen, t, len); |
| 438 | sdssetlen(s, curlen+len); |
| 439 | s[curlen+len] = '\0'; |
| 440 | return s; |
| 441 | } |
| 442 | |
| 443 | /* Append the specified null terminated C string to the sds string 's'. |
| 444 | * |
| 445 | * After the call, the passed sds string is no longer valid and all the |
| 446 | * references must be substituted with the new pointer returned by the call. */ |
| 447 | sds sdscat(sds s, const char *t) { |
| 448 | return sdscatlen(s, t, strlen(t)); |
| 449 | } |
| 450 | |
| 451 | /* Append the specified sds 't' to the existing sds 's'. |
| 452 | * |
| 453 | * After the call, the modified sds string is no longer valid and all the |
| 454 | * references must be substituted with the new pointer returned by the call. */ |
| 455 | sds sdscatsds(sds s, const sds t) { |
| 456 | return sdscatlen(s, t, sdslen(t)); |
| 457 | } |
| 458 | |
| 459 | /* Destructively modify the sds string 's' to hold the specified binary |
| 460 | * safe string pointed by 't' of length 'len' bytes. */ |
| 461 | sds sdscpylen(sds s, const char *t, size_t len) { |
| 462 | if (sdsalloc(s) < len) { |
| 463 | s = sdsMakeRoomFor(s,len-sdslen(s)); |
| 464 | if (s == NULL((void*)0)) return NULL((void*)0); |
| 465 | } |
| 466 | memcpy(s, t, len); |
| 467 | s[len] = '\0'; |
| 468 | sdssetlen(s, len); |
| 469 | return s; |
| 470 | } |
| 471 | |
| 472 | /* Like sdscpylen() but 't' must be a null-termined string so that the length |
| 473 | * of the string is obtained with strlen(). */ |
| 474 | sds sdscpy(sds s, const char *t) { |
| 475 | return sdscpylen(s, t, strlen(t)); |
| 476 | } |
| 477 | |
| 478 | /* Helper for sdscatlonglong() doing the actual number -> string |
| 479 | * conversion. 's' must point to a string with room for at least |
| 480 | * SDS_LLSTR_SIZE bytes. |
| 481 | * |
| 482 | * The function returns the length of the null-terminated string |
| 483 | * representation stored at 's'. */ |
| 484 | #define SDS_LLSTR_SIZE21 21 |
| 485 | int sdsll2str(char *s, long long value) { |
| 486 | char *p, aux; |
| 487 | unsigned long long v; |
| 488 | size_t l; |
| 489 | |
| 490 | /* Generate the string representation, this method produces |
| 491 | * a reversed string. */ |
| 492 | v = (value < 0) ? -value : value; |
| 493 | p = s; |
| 494 | do { |
| 495 | *p++ = '0'+(v%10); |
| 496 | v /= 10; |
| 497 | } while(v); |
| 498 | if (value < 0) *p++ = '-'; |
| 499 | |
| 500 | /* Compute length and add null term. */ |
| 501 | l = p-s; |
| 502 | *p = '\0'; |
| 503 | |
| 504 | /* Reverse the string. */ |
| 505 | p--; |
| 506 | while(s < p) { |
| 507 | aux = *s; |
| 508 | *s = *p; |
| 509 | *p = aux; |
| 510 | s++; |
| 511 | p--; |
| 512 | } |
| 513 | return l; |
| 514 | } |
| 515 | |
| 516 | /* Identical sdsll2str(), but for unsigned long long type. */ |
| 517 | int sdsull2str(char *s, unsigned long long v) { |
| 518 | char *p, aux; |
| 519 | size_t l; |
| 520 | |
| 521 | /* Generate the string representation, this method produces |
| 522 | * a reversed string. */ |
| 523 | p = s; |
| 524 | do { |
| 525 | *p++ = '0'+(v%10); |
| 526 | v /= 10; |
| 527 | } while(v); |
| 528 | |
| 529 | /* Compute length and add null term. */ |
| 530 | l = p-s; |
| 531 | *p = '\0'; |
| 532 | |
| 533 | /* Reverse the string. */ |
| 534 | p--; |
| 535 | while(s < p) { |
| 536 | aux = *s; |
| 537 | *s = *p; |
| 538 | *p = aux; |
| 539 | s++; |
| 540 | p--; |
| 541 | } |
| 542 | return l; |
| 543 | } |
| 544 | |
| 545 | /* Create an sds string from a long long value. It is much faster than: |
| 546 | * |
| 547 | * sdscatprintf(sdsempty(),"%lld\n", value); |
| 548 | */ |
| 549 | sds sdsfromlonglong(long long value) { |
| 550 | char buf[SDS_LLSTR_SIZE21]; |
| 551 | int len = sdsll2str(buf,value); |
| 552 | |
| 553 | return sdsnewlen(buf,len); |
| 554 | } |
| 555 | |
| 556 | /* Like sdscatprintf() but gets va_list instead of being variadic. */ |
| 557 | sds sdscatvprintf(sds s, const char *fmt, va_list ap) { |
| 558 | va_list cpy; |
| 559 | char staticbuf[1024], *buf = staticbuf, *t; |
| 560 | size_t buflen = strlen(fmt)*2; |
| 561 | int bufstrlen; |
| 562 | |
| 563 | /* We try to start using a static buffer for speed. |
| 564 | * If not possible we revert to heap allocation. */ |
| 565 | if (buflen > sizeof(staticbuf)) { |
| 566 | buf = s_malloczmalloc(buflen); |
| 567 | if (buf == NULL((void*)0)) return NULL((void*)0); |
| 568 | } else { |
| 569 | buflen = sizeof(staticbuf); |
| 570 | } |
| 571 | |
| 572 | /* Alloc enough space for buffer and \0 after failing to |
| 573 | * fit the string in the current buffer size. */ |
| 574 | while(1) { |
| 575 | va_copy(cpy,ap)__builtin_va_copy(cpy, ap); |
| 576 | bufstrlen = vsnprintf(buf, buflen, fmt, cpy); |
| 577 | va_end(cpy)__builtin_va_end(cpy); |
| 578 | if (bufstrlen < 0) { |
| 579 | if (buf != staticbuf) s_freezfree(buf); |
| 580 | return NULL((void*)0); |
| 581 | } |
| 582 | if (((size_t)bufstrlen) >= buflen) { |
| 583 | if (buf != staticbuf) s_freezfree(buf); |
| 584 | buflen = ((size_t)bufstrlen) + 1; |
| 585 | buf = s_malloczmalloc(buflen); |
| 586 | if (buf == NULL((void*)0)) return NULL((void*)0); |
| 587 | continue; |
| 588 | } |
| 589 | break; |
| 590 | } |
| 591 | |
| 592 | /* Finally concat the obtained string to the SDS string and return it. */ |
| 593 | t = sdscatlen(s, buf, bufstrlen); |
| 594 | if (buf != staticbuf) s_freezfree(buf); |
| 595 | return t; |
| 596 | } |
| 597 | |
| 598 | /* Append to the sds string 's' a string obtained using printf-alike format |
| 599 | * specifier. |
| 600 | * |
| 601 | * After the call, the modified sds string is no longer valid and all the |
| 602 | * references must be substituted with the new pointer returned by the call. |
| 603 | * |
| 604 | * Example: |
| 605 | * |
| 606 | * s = sdsnew("Sum is: "); |
| 607 | * s = sdscatprintf(s,"%d+%d = %d",a,b,a+b). |
| 608 | * |
| 609 | * Often you need to create a string from scratch with the printf-alike |
| 610 | * format. When this is the need, just use sdsempty() as the target string: |
| 611 | * |
| 612 | * s = sdscatprintf(sdsempty(), "... your format ...", args); |
| 613 | */ |
| 614 | sds sdscatprintf(sds s, const char *fmt, ...) { |
| 615 | va_list ap; |
| 616 | char *t; |
| 617 | va_start(ap, fmt)__builtin_va_start(ap, fmt); |
| 618 | t = sdscatvprintf(s,fmt,ap); |
| 619 | va_end(ap)__builtin_va_end(ap); |
| 620 | return t; |
| 621 | } |
| 622 | |
| 623 | /* This function is similar to sdscatprintf, but much faster as it does |
| 624 | * not rely on sprintf() family functions implemented by the libc that |
| 625 | * are often very slow. Moreover directly handling the sds string as |
| 626 | * new data is concatenated provides a performance improvement. |
| 627 | * |
| 628 | * However this function only handles an incompatible subset of printf-alike |
| 629 | * format specifiers: |
| 630 | * |
| 631 | * %s - C String |
| 632 | * %S - SDS string |
| 633 | * %i - signed int |
| 634 | * %I - 64 bit signed integer (long long, int64_t) |
| 635 | * %u - unsigned int |
| 636 | * %U - 64 bit unsigned integer (unsigned long long, uint64_t) |
| 637 | * %% - Verbatim "%" character. |
| 638 | */ |
| 639 | sds sdscatfmt(sds s, char const *fmt, ...) { |
| 640 | size_t initlen = sdslen(s); |
| 641 | const char *f = fmt; |
| 642 | long i; |
| 643 | va_list ap; |
| 644 | |
| 645 | /* To avoid continuous reallocations, let's start with a buffer that |
| 646 | * can hold at least two times the format string itself. It's not the |
| 647 | * best heuristic but seems to work in practice. */ |
| 648 | s = sdsMakeRoomFor(s, strlen(fmt)*2); |
| 649 | va_start(ap,fmt)__builtin_va_start(ap, fmt); |
| 650 | f = fmt; /* Next format specifier byte to process. */ |
| 651 | i = initlen; /* Position of the next byte to write to dest str. */ |
| 652 | while(*f) { |
| 653 | char next, *str; |
| 654 | size_t l; |
| 655 | long long num; |
| 656 | unsigned long long unum; |
| 657 | |
| 658 | /* Make sure there is always space for at least 1 char. */ |
| 659 | if (sdsavail(s)==0) { |
| 660 | s = sdsMakeRoomFor(s,1); |
| 661 | } |
| 662 | |
| 663 | switch(*f) { |
| 664 | case '%': |
| 665 | next = *(f+1); |
| 666 | f++; |
| 667 | switch(next) { |
| 668 | case 's': |
| 669 | case 'S': |
| 670 | str = va_arg(ap,char*)__builtin_va_arg(ap, char*); |
| 671 | l = (next == 's') ? strlen(str) : sdslen(str); |
| 672 | if (sdsavail(s) < l) { |
| 673 | s = sdsMakeRoomFor(s,l); |
| 674 | } |
| 675 | memcpy(s+i,str,l); |
| 676 | sdsinclen(s,l); |
| 677 | i += l; |
| 678 | break; |
| 679 | case 'i': |
| 680 | case 'I': |
| 681 | if (next == 'i') |
| 682 | num = va_arg(ap,int)__builtin_va_arg(ap, int); |
| 683 | else |
| 684 | num = va_arg(ap,long long)__builtin_va_arg(ap, long long); |
| 685 | { |
| 686 | char buf[SDS_LLSTR_SIZE21]; |
| 687 | l = sdsll2str(buf,num); |
| 688 | if (sdsavail(s) < l) { |
| 689 | s = sdsMakeRoomFor(s,l); |
| 690 | } |
| 691 | memcpy(s+i,buf,l); |
| 692 | sdsinclen(s,l); |
| 693 | i += l; |
| 694 | } |
| 695 | break; |
| 696 | case 'u': |
| 697 | case 'U': |
| 698 | if (next == 'u') |
| 699 | unum = va_arg(ap,unsigned int)__builtin_va_arg(ap, unsigned int); |
| 700 | else |
| 701 | unum = va_arg(ap,unsigned long long)__builtin_va_arg(ap, unsigned long long); |
| 702 | { |
| 703 | char buf[SDS_LLSTR_SIZE21]; |
| 704 | l = sdsull2str(buf,unum); |
| 705 | if (sdsavail(s) < l) { |
| 706 | s = sdsMakeRoomFor(s,l); |
| 707 | } |
| 708 | memcpy(s+i,buf,l); |
| 709 | sdsinclen(s,l); |
| 710 | i += l; |
| 711 | } |
| 712 | break; |
| 713 | default: /* Handle %% and generally %<unknown>. */ |
| 714 | s[i++] = next; |
| 715 | sdsinclen(s,1); |
| 716 | break; |
| 717 | } |
| 718 | break; |
| 719 | default: |
| 720 | s[i++] = *f; |
| 721 | sdsinclen(s,1); |
| 722 | break; |
| 723 | } |
| 724 | f++; |
| 725 | } |
| 726 | va_end(ap)__builtin_va_end(ap); |
| 727 | |
| 728 | /* Add null-term */ |
| 729 | s[i] = '\0'; |
| 730 | return s; |
| 731 | } |
| 732 | |
| 733 | /* Remove the part of the string from left and from right composed just of |
| 734 | * contiguous characters found in 'cset', that is a null terminted C string. |
| 735 | * |
| 736 | * After the call, the modified sds string is no longer valid and all the |
| 737 | * references must be substituted with the new pointer returned by the call. |
| 738 | * |
| 739 | * Example: |
| 740 | * |
| 741 | * s = sdsnew("AA...AA.a.aa.aHelloWorld :::"); |
| 742 | * s = sdstrim(s,"Aa. :"); |
| 743 | * printf("%s\n", s); |
| 744 | * |
| 745 | * Output will be just "HelloWorld". |
| 746 | */ |
| 747 | sds sdstrim(sds s, const char *cset) { |
| 748 | char *start, *end, *sp, *ep; |
| 749 | size_t len; |
| 750 | |
| 751 | sp = start = s; |
Although the value stored to 'start' is used in the enclosing expression, the value is never actually read from 'start' | |
| 752 | ep = end = s+sdslen(s)-1; |
| 753 | while(sp <= end && strchr(cset, *sp)) sp++; |
| 754 | while(ep > sp && strchr(cset, *ep)) ep--; |
| 755 | len = (sp > ep) ? 0 : ((ep-sp)+1); |
| 756 | if (s != sp) memmove(s, sp, len); |
| 757 | s[len] = '\0'; |
| 758 | sdssetlen(s,len); |
| 759 | return s; |
| 760 | } |
| 761 | |
| 762 | /* Turn the string into a smaller (or equal) string containing only the |
| 763 | * substring specified by the 'start' and 'end' indexes. |
| 764 | * |
| 765 | * start and end can be negative, where -1 means the last character of the |
| 766 | * string, -2 the penultimate character, and so forth. |
| 767 | * |
| 768 | * The interval is inclusive, so the start and end characters will be part |
| 769 | * of the resulting string. |
| 770 | * |
| 771 | * The string is modified in-place. |
| 772 | * |
| 773 | * Example: |
| 774 | * |
| 775 | * s = sdsnew("Hello World"); |
| 776 | * sdsrange(s,1,-1); => "ello World" |
| 777 | */ |
| 778 | void sdsrange(sds s, ssize_t start, ssize_t end) { |
| 779 | size_t newlen, len = sdslen(s); |
| 780 | |
| 781 | if (len == 0) return; |
| 782 | if (start < 0) { |
| 783 | start = len+start; |
| 784 | if (start < 0) start = 0; |
| 785 | } |
| 786 | if (end < 0) { |
| 787 | end = len+end; |
| 788 | if (end < 0) end = 0; |
| 789 | } |
| 790 | newlen = (start > end) ? 0 : (end-start)+1; |
| 791 | if (newlen != 0) { |
| 792 | if (start >= (ssize_t)len) { |
| 793 | newlen = 0; |
| 794 | } else if (end >= (ssize_t)len) { |
| 795 | end = len-1; |
| 796 | newlen = (start > end) ? 0 : (end-start)+1; |
| 797 | } |
| 798 | } |
| 799 | if (start && newlen) memmove(s, s+start, newlen); |
| 800 | s[newlen] = 0; |
| 801 | sdssetlen(s,newlen); |
| 802 | } |
| 803 | |
| 804 | /* Apply tolower() to every character of the sds string 's'. */ |
| 805 | void sdstolower(sds s) { |
| 806 | size_t len = sdslen(s), j; |
| 807 | |
| 808 | for (j = 0; j < len; j++) s[j] = tolower(s[j])(__extension__ ({ int __res; if (sizeof (s[j]) > 1) { if ( __builtin_constant_p (s[j])) { int __c = (s[j]); __res = __c < -128 || __c > 255 ? __c : (*__ctype_tolower_loc ())[__c]; } else __res = tolower (s[j]); } else __res = (*__ctype_tolower_loc ())[(int) (s[j])]; __res; })); |
| 809 | } |
| 810 | |
| 811 | /* Apply toupper() to every character of the sds string 's'. */ |
| 812 | void sdstoupper(sds s) { |
| 813 | size_t len = sdslen(s), j; |
| 814 | |
| 815 | for (j = 0; j < len; j++) s[j] = toupper(s[j])(__extension__ ({ int __res; if (sizeof (s[j]) > 1) { if ( __builtin_constant_p (s[j])) { int __c = (s[j]); __res = __c < -128 || __c > 255 ? __c : (*__ctype_toupper_loc ())[__c]; } else __res = toupper (s[j]); } else __res = (*__ctype_toupper_loc ())[(int) (s[j])]; __res; })); |
| 816 | } |
| 817 | |
| 818 | /* Compare two sds strings s1 and s2 with memcmp(). |
| 819 | * |
| 820 | * Return value: |
| 821 | * |
| 822 | * positive if s1 > s2. |
| 823 | * negative if s1 < s2. |
| 824 | * 0 if s1 and s2 are exactly the same binary string. |
| 825 | * |
| 826 | * If two strings share exactly the same prefix, but one of the two has |
| 827 | * additional characters, the longer string is considered to be greater than |
| 828 | * the smaller one. */ |
| 829 | int sdscmp(const sds s1, const sds s2) { |
| 830 | size_t l1, l2, minlen; |
| 831 | int cmp; |
| 832 | |
| 833 | l1 = sdslen(s1); |
| 834 | l2 = sdslen(s2); |
| 835 | minlen = (l1 < l2) ? l1 : l2; |
| 836 | cmp = memcmp(s1,s2,minlen); |
| 837 | if (cmp == 0) return l1>l2? 1: (l1<l2? -1: 0); |
| 838 | return cmp; |
| 839 | } |
| 840 | |
| 841 | /* Split 's' with separator in 'sep'. An array |
| 842 | * of sds strings is returned. *count will be set |
| 843 | * by reference to the number of tokens returned. |
| 844 | * |
| 845 | * On out of memory, zero length string, zero length |
| 846 | * separator, NULL is returned. |
| 847 | * |
| 848 | * Note that 'sep' is able to split a string using |
| 849 | * a multi-character separator. For example |
| 850 | * sdssplit("foo_-_bar","_-_"); will return two |
| 851 | * elements "foo" and "bar". |
| 852 | * |
| 853 | * This version of the function is binary-safe but |
| 854 | * requires length arguments. sdssplit() is just the |
| 855 | * same function but for zero-terminated strings. |
| 856 | */ |
| 857 | sds *sdssplitlen(const char *s, ssize_t len, const char *sep, int seplen, int *count) { |
| 858 | int elements = 0, slots = 5; |
| 859 | long start = 0, j; |
| 860 | sds *tokens; |
| 861 | |
| 862 | if (seplen < 1 || len < 0) return NULL((void*)0); |
| 863 | |
| 864 | tokens = s_malloczmalloc(sizeof(sds)*slots); |
| 865 | if (tokens == NULL((void*)0)) return NULL((void*)0); |
| 866 | |
| 867 | if (len == 0) { |
| 868 | *count = 0; |
| 869 | return tokens; |
| 870 | } |
| 871 | for (j = 0; j < (len-(seplen-1)); j++) { |
| 872 | /* make sure there is room for the next element and the final one */ |
| 873 | if (slots < elements+2) { |
| 874 | sds *newtokens; |
| 875 | |
| 876 | slots *= 2; |
| 877 | newtokens = s_realloczrealloc(tokens,sizeof(sds)*slots); |
| 878 | if (newtokens == NULL((void*)0)) goto cleanup; |
| 879 | tokens = newtokens; |
| 880 | } |
| 881 | /* search the separator */ |
| 882 | if ((seplen == 1 && *(s+j) == sep[0]) || (memcmp(s+j,sep,seplen) == 0)) { |
| 883 | tokens[elements] = sdsnewlen(s+start,j-start); |
| 884 | if (tokens[elements] == NULL((void*)0)) goto cleanup; |
| 885 | elements++; |
| 886 | start = j+seplen; |
| 887 | j = j+seplen-1; /* skip the separator */ |
| 888 | } |
| 889 | } |
| 890 | /* Add the final element. We are sure there is room in the tokens array. */ |
| 891 | tokens[elements] = sdsnewlen(s+start,len-start); |
| 892 | if (tokens[elements] == NULL((void*)0)) goto cleanup; |
| 893 | elements++; |
| 894 | *count = elements; |
| 895 | return tokens; |
| 896 | |
| 897 | cleanup: |
| 898 | { |
| 899 | int i; |
| 900 | for (i = 0; i < elements; i++) sdsfree(tokens[i]); |
| 901 | s_freezfree(tokens); |
| 902 | *count = 0; |
| 903 | return NULL((void*)0); |
| 904 | } |
| 905 | } |
| 906 | |
| 907 | /* Free the result returned by sdssplitlen(), or do nothing if 'tokens' is NULL. */ |
| 908 | void sdsfreesplitres(sds *tokens, int count) { |
| 909 | if (!tokens) return; |
| 910 | while(count--) |
| 911 | sdsfree(tokens[count]); |
| 912 | s_freezfree(tokens); |
| 913 | } |
| 914 | |
| 915 | /* Append to the sds string "s" an escaped string representation where |
| 916 | * all the non-printable characters (tested with isprint()) are turned into |
| 917 | * escapes in the form "\n\r\a...." or "\x<hex-number>". |
| 918 | * |
| 919 | * After the call, the modified sds string is no longer valid and all the |
| 920 | * references must be substituted with the new pointer returned by the call. */ |
| 921 | sds sdscatrepr(sds s, const char *p, size_t len) { |
| 922 | s = sdscatlen(s,"\"",1); |
| 923 | while(len--) { |
| 924 | switch(*p) { |
| 925 | case '\\': |
| 926 | case '"': |
| 927 | s = sdscatprintf(s,"\\%c",*p); |
| 928 | break; |
| 929 | case '\n': s = sdscatlen(s,"\\n",2); break; |
| 930 | case '\r': s = sdscatlen(s,"\\r",2); break; |
| 931 | case '\t': s = sdscatlen(s,"\\t",2); break; |
| 932 | case '\a': s = sdscatlen(s,"\\a",2); break; |
| 933 | case '\b': s = sdscatlen(s,"\\b",2); break; |
| 934 | default: |
| 935 | if (isprint(*p)((*__ctype_b_loc ())[(int) ((*p))] & (unsigned short int) _ISprint)) |
| 936 | s = sdscatprintf(s,"%c",*p); |
| 937 | else |
| 938 | s = sdscatprintf(s,"\\x%02x",(unsigned char)*p); |
| 939 | break; |
| 940 | } |
| 941 | p++; |
| 942 | } |
| 943 | return sdscatlen(s,"\"",1); |
| 944 | } |
| 945 | |
| 946 | /* Helper function for sdssplitargs() that returns non zero if 'c' |
| 947 | * is a valid hex digit. */ |
| 948 | int is_hex_digit(char c) { |
| 949 | return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') || |
| 950 | (c >= 'A' && c <= 'F'); |
| 951 | } |
| 952 | |
| 953 | /* Helper function for sdssplitargs() that converts a hex digit into an |
| 954 | * integer from 0 to 15 */ |
| 955 | int hex_digit_to_int(char c) { |
| 956 | switch(c) { |
| 957 | case '0': return 0; |
| 958 | case '1': return 1; |
| 959 | case '2': return 2; |
| 960 | case '3': return 3; |
| 961 | case '4': return 4; |
| 962 | case '5': return 5; |
| 963 | case '6': return 6; |
| 964 | case '7': return 7; |
| 965 | case '8': return 8; |
| 966 | case '9': return 9; |
| 967 | case 'a': case 'A': return 10; |
| 968 | case 'b': case 'B': return 11; |
| 969 | case 'c': case 'C': return 12; |
| 970 | case 'd': case 'D': return 13; |
| 971 | case 'e': case 'E': return 14; |
| 972 | case 'f': case 'F': return 15; |
| 973 | default: return 0; |
| 974 | } |
| 975 | } |
| 976 | |
| 977 | /* Split a line into arguments, where every argument can be in the |
| 978 | * following programming-language REPL-alike form: |
| 979 | * |
| 980 | * foo bar "newline are supported\n" and "\xff\x00otherstuff" |
| 981 | * |
| 982 | * The number of arguments is stored into *argc, and an array |
| 983 | * of sds is returned. |
| 984 | * |
| 985 | * The caller should free the resulting array of sds strings with |
| 986 | * sdsfreesplitres(). |
| 987 | * |
| 988 | * Note that sdscatrepr() is able to convert back a string into |
| 989 | * a quoted string in the same format sdssplitargs() is able to parse. |
| 990 | * |
| 991 | * The function returns the allocated tokens on success, even when the |
| 992 | * input string is empty, or NULL if the input contains unbalanced |
| 993 | * quotes or closed quotes followed by non space characters |
| 994 | * as in: "foo"bar or "foo' |
| 995 | */ |
| 996 | sds *sdssplitargs(const char *line, int *argc) { |
| 997 | const char *p = line; |
| 998 | char *current = NULL((void*)0); |
| 999 | char **vector = NULL((void*)0); |
| 1000 | |
| 1001 | *argc = 0; |
| 1002 | while(1) { |
| 1003 | /* skip blanks */ |
| 1004 | while(*p && isspace(*p)((*__ctype_b_loc ())[(int) ((*p))] & (unsigned short int) _ISspace)) p++; |
| 1005 | if (*p) { |
| 1006 | /* get a token */ |
| 1007 | int inq=0; /* set to 1 if we are in "quotes" */ |
| 1008 | int insq=0; /* set to 1 if we are in 'single quotes' */ |
| 1009 | int done=0; |
| 1010 | |
| 1011 | if (current == NULL((void*)0)) current = sdsempty(); |
| 1012 | while(!done) { |
| 1013 | if (inq) { |
| 1014 | if (*p == '\\' && *(p+1) == 'x' && |
| 1015 | is_hex_digit(*(p+2)) && |
| 1016 | is_hex_digit(*(p+3))) |
| 1017 | { |
| 1018 | unsigned char byte; |
| 1019 | |
| 1020 | byte = (hex_digit_to_int(*(p+2))*16)+ |
| 1021 | hex_digit_to_int(*(p+3)); |
| 1022 | current = sdscatlen(current,(char*)&byte,1); |
| 1023 | p += 3; |
| 1024 | } else if (*p == '\\' && *(p+1)) { |
| 1025 | char c; |
| 1026 | |
| 1027 | p++; |
| 1028 | switch(*p) { |
| 1029 | case 'n': c = '\n'; break; |
| 1030 | case 'r': c = '\r'; break; |
| 1031 | case 't': c = '\t'; break; |
| 1032 | case 'b': c = '\b'; break; |
| 1033 | case 'a': c = '\a'; break; |
| 1034 | default: c = *p; break; |
| 1035 | } |
| 1036 | current = sdscatlen(current,&c,1); |
| 1037 | } else if (*p == '"') { |
| 1038 | /* closing quote must be followed by a space or |
| 1039 | * nothing at all. */ |
| 1040 | if (*(p+1) && !isspace(*(p+1))((*__ctype_b_loc ())[(int) ((*(p+1)))] & (unsigned short int ) _ISspace)) goto err; |
| 1041 | done=1; |
| 1042 | } else if (!*p) { |
| 1043 | /* unterminated quotes */ |
| 1044 | goto err; |
| 1045 | } else { |
| 1046 | current = sdscatlen(current,p,1); |
| 1047 | } |
| 1048 | } else if (insq) { |
| 1049 | if (*p == '\\' && *(p+1) == '\'') { |
| 1050 | p++; |
| 1051 | current = sdscatlen(current,"'",1); |
| 1052 | } else if (*p == '\'') { |
| 1053 | /* closing quote must be followed by a space or |
| 1054 | * nothing at all. */ |
| 1055 | if (*(p+1) && !isspace(*(p+1))((*__ctype_b_loc ())[(int) ((*(p+1)))] & (unsigned short int ) _ISspace)) goto err; |
| 1056 | done=1; |
| 1057 | } else if (!*p) { |
| 1058 | /* unterminated quotes */ |
| 1059 | goto err; |
| 1060 | } else { |
| 1061 | current = sdscatlen(current,p,1); |
| 1062 | } |
| 1063 | } else { |
| 1064 | switch(*p) { |
| 1065 | case ' ': |
| 1066 | case '\n': |
| 1067 | case '\r': |
| 1068 | case '\t': |
| 1069 | case '\0': |
| 1070 | done=1; |
| 1071 | break; |
| 1072 | case '"': |
| 1073 | inq=1; |
| 1074 | break; |
| 1075 | case '\'': |
| 1076 | insq=1; |
| 1077 | break; |
| 1078 | default: |
| 1079 | current = sdscatlen(current,p,1); |
| 1080 | break; |
| 1081 | } |
| 1082 | } |
| 1083 | if (*p) p++; |
| 1084 | } |
| 1085 | /* add the token to the vector */ |
| 1086 | vector = s_realloczrealloc(vector,((*argc)+1)*sizeof(char*)); |
| 1087 | vector[*argc] = current; |
| 1088 | (*argc)++; |
| 1089 | current = NULL((void*)0); |
| 1090 | } else { |
| 1091 | /* Even on empty input string return something not NULL. */ |
| 1092 | if (vector == NULL((void*)0)) vector = s_malloczmalloc(sizeof(void*)); |
| 1093 | return vector; |
| 1094 | } |
| 1095 | } |
| 1096 | |
| 1097 | err: |
| 1098 | while((*argc)--) |
| 1099 | sdsfree(vector[*argc]); |
| 1100 | s_freezfree(vector); |
| 1101 | if (current) sdsfree(current); |
| 1102 | *argc = 0; |
| 1103 | return NULL((void*)0); |
| 1104 | } |
| 1105 | |
| 1106 | /* Modify the string substituting all the occurrences of the set of |
| 1107 | * characters specified in the 'from' string to the corresponding character |
| 1108 | * in the 'to' array. |
| 1109 | * |
| 1110 | * For instance: sdsmapchars(mystring, "ho", "01", 2) |
| 1111 | * will have the effect of turning the string "hello" into "0ell1". |
| 1112 | * |
| 1113 | * The function returns the sds string pointer, that is always the same |
| 1114 | * as the input pointer since no resize is needed. */ |
| 1115 | sds sdsmapchars(sds s, const char *from, const char *to, size_t setlen) { |
| 1116 | size_t j, i, l = sdslen(s); |
| 1117 | |
| 1118 | for (j = 0; j < l; j++) { |
| 1119 | for (i = 0; i < setlen; i++) { |
| 1120 | if (s[j] == from[i]) { |
| 1121 | s[j] = to[i]; |
| 1122 | break; |
| 1123 | } |
| 1124 | } |
| 1125 | } |
| 1126 | return s; |
| 1127 | } |
| 1128 | |
| 1129 | /* Join an array of C strings using the specified separator (also a C string). |
| 1130 | * Returns the result as an sds string. */ |
| 1131 | sds sdsjoin(char **argv, int argc, char *sep) { |
| 1132 | sds join = sdsempty(); |
| 1133 | int j; |
| 1134 | |
| 1135 | for (j = 0; j < argc; j++) { |
| 1136 | join = sdscat(join, argv[j]); |
| 1137 | if (j != argc-1) join = sdscat(join,sep); |
| 1138 | } |
| 1139 | return join; |
| 1140 | } |
| 1141 | |
| 1142 | /* Like sdsjoin, but joins an array of SDS strings. */ |
| 1143 | sds sdsjoinsds(sds *argv, int argc, const char *sep, size_t seplen) { |
| 1144 | sds join = sdsempty(); |
| 1145 | int j; |
| 1146 | |
| 1147 | for (j = 0; j < argc; j++) { |
| 1148 | join = sdscatsds(join, argv[j]); |
| 1149 | if (j != argc-1) join = sdscatlen(join,sep,seplen); |
| 1150 | } |
| 1151 | return join; |
| 1152 | } |
| 1153 | |
| 1154 | /* Wrappers to the allocators used by SDS. Note that SDS will actually |
| 1155 | * just use the macros defined into sdsalloc.h in order to avoid to pay |
| 1156 | * the overhead of function calls. Here we define these wrappers only for |
| 1157 | * the programs SDS is linked to, if they want to touch the SDS internals |
| 1158 | * even if they use a different allocator. */ |
| 1159 | void *sds_malloc(size_t size) { return s_malloczmalloc(size); } |
| 1160 | void *sds_realloc(void *ptr, size_t size) { return s_realloczrealloc(ptr,size); } |
| 1161 | void sds_free(void *ptr) { s_freezfree(ptr); } |
| 1162 | |
| 1163 | /* Perform expansion of a template string and return the result as a newly |
| 1164 | * allocated sds. |
| 1165 | * |
| 1166 | * Template variables are specified using curly brackets, e.g. {variable}. |
| 1167 | * An opening bracket can be quoted by repeating it twice. |
| 1168 | */ |
| 1169 | sds sdstemplate(const char *template, sdstemplate_callback_t cb_func, void *cb_arg) |
| 1170 | { |
| 1171 | sds res = sdsempty(); |
| 1172 | const char *p = template; |
| 1173 | |
| 1174 | while (*p) { |
| 1175 | /* Find next variable, copy everything until there */ |
| 1176 | const char *sv = strchr(p, '{'); |
| 1177 | if (!sv) { |
| 1178 | /* Not found: copy till rest of template and stop */ |
| 1179 | res = sdscat(res, p); |
| 1180 | break; |
| 1181 | } else if (sv > p) { |
| 1182 | /* Found: copy anything up to the begining of the variable */ |
| 1183 | res = sdscatlen(res, p, sv - p); |
| 1184 | } |
| 1185 | |
| 1186 | /* Skip into variable name, handle premature end or quoting */ |
| 1187 | sv++; |
| 1188 | if (!*sv) goto error; /* Premature end of template */ |
| 1189 | if (*sv == '{') { |
| 1190 | /* Quoted '{' */ |
| 1191 | p = sv + 1; |
| 1192 | res = sdscat(res, "{"); |
| 1193 | continue; |
| 1194 | } |
| 1195 | |
| 1196 | /* Find end of variable name, handle premature end of template */ |
| 1197 | const char *ev = strchr(sv, '}'); |
| 1198 | if (!ev) goto error; |
| 1199 | |
| 1200 | /* Pass variable name to callback and obtain value. If callback failed, |
| 1201 | * abort. */ |
| 1202 | sds varname = sdsnewlen(sv, ev - sv); |
| 1203 | sds value = cb_func(varname, cb_arg); |
| 1204 | sdsfree(varname); |
| 1205 | if (!value) goto error; |
| 1206 | |
| 1207 | /* Append value to result and continue */ |
| 1208 | res = sdscat(res, value); |
| 1209 | sdsfree(value); |
| 1210 | p = ev + 1; |
| 1211 | } |
| 1212 | |
| 1213 | return res; |
| 1214 | |
| 1215 | error: |
| 1216 | sdsfree(res); |
| 1217 | return NULL((void*)0); |
| 1218 | } |
| 1219 | |
| 1220 | #ifdef REDIS_TEST |
| 1221 | #include <stdio.h> |
| 1222 | #include <limits.h> |
| 1223 | #include "testhelp.h" |
| 1224 | |
| 1225 | #define UNUSED(x) (void)(x) |
| 1226 | |
| 1227 | static sds sdsTestTemplateCallback(sds varname, void *arg) { |
| 1228 | UNUSED(arg); |
| 1229 | static const char *_var1 = "variable1"; |
| 1230 | static const char *_var2 = "variable2"; |
| 1231 | |
| 1232 | if (!strcmp(varname, _var1)) return sdsnew("value1"); |
| 1233 | else if (!strcmp(varname, _var2)) return sdsnew("value2"); |
| 1234 | else return NULL((void*)0); |
| 1235 | } |
| 1236 | |
| 1237 | int sdsTest(int argc, char **argv) { |
| 1238 | UNUSED(argc); |
| 1239 | UNUSED(argv); |
| 1240 | |
| 1241 | { |
| 1242 | sds x = sdsnew("foo"), y; |
| 1243 | |
| 1244 | test_cond("Create a string and obtain the length", |
| 1245 | sdslen(x) == 3 && memcmp(x,"foo\0",4) == 0); |
| 1246 | |
| 1247 | sdsfree(x); |
| 1248 | x = sdsnewlen("foo",2); |
| 1249 | test_cond("Create a string with specified length", |
| 1250 | sdslen(x) == 2 && memcmp(x,"fo\0",3) == 0); |
| 1251 | |
| 1252 | x = sdscat(x,"bar"); |
| 1253 | test_cond("Strings concatenation", |
| 1254 | sdslen(x) == 5 && memcmp(x,"fobar\0",6) == 0); |
| 1255 | |
| 1256 | x = sdscpy(x,"a"); |
| 1257 | test_cond("sdscpy() against an originally longer string", |
| 1258 | sdslen(x) == 1 && memcmp(x,"a\0",2) == 0); |
| 1259 | |
| 1260 | x = sdscpy(x,"xyzxxxxxxxxxxyyyyyyyyyykkkkkkkkkk"); |
| 1261 | test_cond("sdscpy() against an originally shorter string", |
| 1262 | sdslen(x) == 33 && |
| 1263 | memcmp(x,"xyzxxxxxxxxxxyyyyyyyyyykkkkkkkkkk\0",33) == 0); |
| 1264 | |
| 1265 | sdsfree(x); |
| 1266 | x = sdscatprintf(sdsempty(),"%d",123); |
| 1267 | test_cond("sdscatprintf() seems working in the base case", |
| 1268 | sdslen(x) == 3 && memcmp(x,"123\0",4) == 0); |
| 1269 | |
| 1270 | sdsfree(x); |
| 1271 | x = sdscatprintf(sdsempty(),"a%cb",0); |
| 1272 | test_cond("sdscatprintf() seems working with \\0 inside of result", |
| 1273 | sdslen(x) == 3 && memcmp(x,"a\0""b\0",4) == 0); |
| 1274 | |
| 1275 | { |
| 1276 | sdsfree(x); |
| 1277 | char etalon[1024*1024]; |
| 1278 | for (size_t i = 0; i < sizeof(etalon); i++) { |
| 1279 | etalon[i] = '0'; |
| 1280 | } |
| 1281 | x = sdscatprintf(sdsempty(),"%0*d",(int)sizeof(etalon),0); |
| 1282 | test_cond("sdscatprintf() can print 1MB", |
| 1283 | sdslen(x) == sizeof(etalon) && memcmp(x,etalon,sizeof(etalon)) == 0); |
| 1284 | } |
| 1285 | |
| 1286 | sdsfree(x); |
| 1287 | x = sdsnew("--"); |
| 1288 | x = sdscatfmt(x, "Hello %s World %I,%I--", "Hi!", LLONG_MIN(-9223372036854775807LL -1LL),LLONG_MAX9223372036854775807LL); |
| 1289 | test_cond("sdscatfmt() seems working in the base case", |
| 1290 | sdslen(x) == 60 && |
| 1291 | memcmp(x,"--Hello Hi! World -9223372036854775808," |
| 1292 | "9223372036854775807--",60) == 0); |
| 1293 | printf("[%s]\n",x); |
| 1294 | |
| 1295 | sdsfree(x); |
| 1296 | x = sdsnew("--"); |
| 1297 | x = sdscatfmt(x, "%u,%U--", UINT_MAX(2147483647 *2U +1U), ULLONG_MAX(9223372036854775807LL*2ULL+1ULL)); |
| 1298 | test_cond("sdscatfmt() seems working with unsigned numbers", |
| 1299 | sdslen(x) == 35 && |
| 1300 | memcmp(x,"--4294967295,18446744073709551615--",35) == 0); |
| 1301 | |
| 1302 | sdsfree(x); |
| 1303 | x = sdsnew(" x "); |
| 1304 | sdstrim(x," x"); |
| 1305 | test_cond("sdstrim() works when all chars match", |
| 1306 | sdslen(x) == 0); |
| 1307 | |
| 1308 | sdsfree(x); |
| 1309 | x = sdsnew(" x "); |
| 1310 | sdstrim(x," "); |
| 1311 | test_cond("sdstrim() works when a single char remains", |
| 1312 | sdslen(x) == 1 && x[0] == 'x'); |
| 1313 | |
| 1314 | sdsfree(x); |
| 1315 | x = sdsnew("xxciaoyyy"); |
| 1316 | sdstrim(x,"xy"); |
| 1317 | test_cond("sdstrim() correctly trims characters", |
| 1318 | sdslen(x) == 4 && memcmp(x,"ciao\0",5) == 0); |
| 1319 | |
| 1320 | y = sdsdup(x); |
| 1321 | sdsrange(y,1,1); |
| 1322 | test_cond("sdsrange(...,1,1)", |
| 1323 | sdslen(y) == 1 && memcmp(y,"i\0",2) == 0); |
| 1324 | |
| 1325 | sdsfree(y); |
| 1326 | y = sdsdup(x); |
| 1327 | sdsrange(y,1,-1); |
| 1328 | test_cond("sdsrange(...,1,-1)", |
| 1329 | sdslen(y) == 3 && memcmp(y,"iao\0",4) == 0); |
| 1330 | |
| 1331 | sdsfree(y); |
| 1332 | y = sdsdup(x); |
| 1333 | sdsrange(y,-2,-1); |
| 1334 | test_cond("sdsrange(...,-2,-1)", |
| 1335 | sdslen(y) == 2 && memcmp(y,"ao\0",3) == 0); |
| 1336 | |
| 1337 | sdsfree(y); |
| 1338 | y = sdsdup(x); |
| 1339 | sdsrange(y,2,1); |
| 1340 | test_cond("sdsrange(...,2,1)", |
| 1341 | sdslen(y) == 0 && memcmp(y,"\0",1) == 0); |
| 1342 | |
| 1343 | sdsfree(y); |
| 1344 | y = sdsdup(x); |
| 1345 | sdsrange(y,1,100); |
| 1346 | test_cond("sdsrange(...,1,100)", |
| 1347 | sdslen(y) == 3 && memcmp(y,"iao\0",4) == 0); |
| 1348 | |
| 1349 | sdsfree(y); |
| 1350 | y = sdsdup(x); |
| 1351 | sdsrange(y,100,100); |
| 1352 | test_cond("sdsrange(...,100,100)", |
| 1353 | sdslen(y) == 0 && memcmp(y,"\0",1) == 0); |
| 1354 | |
| 1355 | sdsfree(y); |
| 1356 | sdsfree(x); |
| 1357 | x = sdsnew("foo"); |
| 1358 | y = sdsnew("foa"); |
| 1359 | test_cond("sdscmp(foo,foa)", sdscmp(x,y) > 0); |
| 1360 | |
| 1361 | sdsfree(y); |
| 1362 | sdsfree(x); |
| 1363 | x = sdsnew("bar"); |
| 1364 | y = sdsnew("bar"); |
| 1365 | test_cond("sdscmp(bar,bar)", sdscmp(x,y) == 0); |
| 1366 | |
| 1367 | sdsfree(y); |
| 1368 | sdsfree(x); |
| 1369 | x = sdsnew("aar"); |
| 1370 | y = sdsnew("bar"); |
| 1371 | test_cond("sdscmp(bar,bar)", sdscmp(x,y) < 0); |
| 1372 | |
| 1373 | sdsfree(y); |
| 1374 | sdsfree(x); |
| 1375 | x = sdsnewlen("\a\n\0foo\r",7); |
| 1376 | y = sdscatrepr(sdsempty(),x,sdslen(x)); |
| 1377 | test_cond("sdscatrepr(...data...)", |
| 1378 | memcmp(y,"\"\\a\\n\\x00foo\\r\"",15) == 0); |
| 1379 | |
| 1380 | { |
| 1381 | unsigned int oldfree; |
| 1382 | char *p; |
| 1383 | int i; |
| 1384 | size_t step = 10, j; |
| 1385 | |
| 1386 | sdsfree(x); |
| 1387 | sdsfree(y); |
| 1388 | x = sdsnew("0"); |
| 1389 | test_cond("sdsnew() free/len buffers", sdslen(x) == 1 && sdsavail(x) == 0); |
| 1390 | |
| 1391 | /* Run the test a few times in order to hit the first two |
| 1392 | * SDS header types. */ |
| 1393 | for (i = 0; i < 10; i++) { |
| 1394 | size_t oldlen = sdslen(x); |
| 1395 | x = sdsMakeRoomFor(x,step); |
| 1396 | int type = x[-1]&SDS_TYPE_MASK7; |
| 1397 | |
| 1398 | test_cond("sdsMakeRoomFor() len", sdslen(x) == oldlen); |
| 1399 | if (type != SDS_TYPE_50) { |
| 1400 | test_cond("sdsMakeRoomFor() free", sdsavail(x) >= step); |
| 1401 | oldfree = sdsavail(x); |
| 1402 | UNUSED(oldfree); |
| 1403 | } |
| 1404 | p = x+oldlen; |
| 1405 | for (j = 0; j < step; j++) { |
| 1406 | p[j] = 'A'+j; |
| 1407 | } |
| 1408 | sdsIncrLen(x,step); |
| 1409 | } |
| 1410 | test_cond("sdsMakeRoomFor() content", |
| 1411 | memcmp("0ABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJ",x,101) == 0); |
| 1412 | test_cond("sdsMakeRoomFor() final length",sdslen(x)==101); |
| 1413 | |
| 1414 | sdsfree(x); |
| 1415 | } |
| 1416 | |
| 1417 | /* Simple template */ |
| 1418 | x = sdstemplate("v1={variable1} v2={variable2}", sdsTestTemplateCallback, NULL((void*)0)); |
| 1419 | test_cond("sdstemplate() normal flow", |
| 1420 | memcmp(x,"v1=value1 v2=value2",19) == 0); |
| 1421 | sdsfree(x); |
| 1422 | |
| 1423 | /* Template with callback error */ |
| 1424 | x = sdstemplate("v1={variable1} v3={doesnotexist}", sdsTestTemplateCallback, NULL((void*)0)); |
| 1425 | test_cond("sdstemplate() with callback error", x == NULL((void*)0)); |
| 1426 | |
| 1427 | /* Template with empty var name */ |
| 1428 | x = sdstemplate("v1={", sdsTestTemplateCallback, NULL((void*)0)); |
| 1429 | test_cond("sdstemplate() with empty var name", x == NULL((void*)0)); |
| 1430 | |
| 1431 | /* Template with truncated var name */ |
| 1432 | x = sdstemplate("v1={start", sdsTestTemplateCallback, NULL((void*)0)); |
| 1433 | test_cond("sdstemplate() with truncated var name", x == NULL((void*)0)); |
| 1434 | |
| 1435 | /* Template with quoting */ |
| 1436 | x = sdstemplate("v1={{{variable1}} {{} v2={variable2}", sdsTestTemplateCallback, NULL((void*)0)); |
| 1437 | test_cond("sdstemplate() with quoting", |
| 1438 | memcmp(x,"v1={value1} {} v2=value2",24) == 0); |
| 1439 | sdsfree(x); |
| 1440 | } |
| 1441 | test_report(); |
| 1442 | return 0; |
| 1443 | } |
| 1444 | #endif |