William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 1 | /* |
| 2 | * string.c : an XML string utilities module |
| 3 | * |
| 4 | * This module provides various utility functions for manipulating |
| 5 | * the xmlChar* type. All functions named xmlStr* have been moved here |
Daniel Veillard | f8e3db0 | 2012-09-11 13:26:36 +0800 | [diff] [blame] | 6 | * from the parser.c file (their original home). |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 7 | * |
| 8 | * See Copyright for the status of this software. |
| 9 | * |
| 10 | * UTF8 string routines from: |
| 11 | * William Brack <wbrack@mmm.com.hk> |
| 12 | * |
| 13 | * daniel@veillard.com |
| 14 | */ |
| 15 | |
| 16 | #define IN_LIBXML |
| 17 | #include "libxml.h" |
| 18 | |
| 19 | #include <stdlib.h> |
| 20 | #include <string.h> |
Elliott Hughes | ecdab2a | 2022-02-23 14:33:50 -0800 | [diff] [blame] | 21 | #include <limits.h> |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 22 | #include <libxml/xmlmemory.h> |
| 23 | #include <libxml/parserInternals.h> |
| 24 | #include <libxml/xmlstring.h> |
| 25 | |
| 26 | /************************************************************************ |
| 27 | * * |
| 28 | * Commodity functions to handle xmlChars * |
| 29 | * * |
| 30 | ************************************************************************/ |
| 31 | |
| 32 | /** |
| 33 | * xmlStrndup: |
| 34 | * @cur: the input xmlChar * |
| 35 | * @len: the len of @cur |
| 36 | * |
| 37 | * a strndup for array of xmlChar's |
| 38 | * |
| 39 | * Returns a new xmlChar * or NULL |
| 40 | */ |
| 41 | xmlChar * |
| 42 | xmlStrndup(const xmlChar *cur, int len) { |
| 43 | xmlChar *ret; |
Daniel Veillard | f8e3db0 | 2012-09-11 13:26:36 +0800 | [diff] [blame] | 44 | |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 45 | if ((cur == NULL) || (len < 0)) return(NULL); |
Elliott Hughes | ecdab2a | 2022-02-23 14:33:50 -0800 | [diff] [blame] | 46 | ret = (xmlChar *) xmlMallocAtomic(((size_t) len + 1) * sizeof(xmlChar)); |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 47 | if (ret == NULL) { |
| 48 | xmlErrMemory(NULL, NULL); |
| 49 | return(NULL); |
| 50 | } |
| 51 | memcpy(ret, cur, len * sizeof(xmlChar)); |
| 52 | ret[len] = 0; |
| 53 | return(ret); |
| 54 | } |
| 55 | |
| 56 | /** |
| 57 | * xmlStrdup: |
| 58 | * @cur: the input xmlChar * |
| 59 | * |
| 60 | * a strdup for array of xmlChar's. Since they are supposed to be |
| 61 | * encoded in UTF-8 or an encoding with 8bit based chars, we assume |
| 62 | * a termination mark of '0'. |
| 63 | * |
| 64 | * Returns a new xmlChar * or NULL |
| 65 | */ |
| 66 | xmlChar * |
| 67 | xmlStrdup(const xmlChar *cur) { |
| 68 | const xmlChar *p = cur; |
| 69 | |
| 70 | if (cur == NULL) return(NULL); |
| 71 | while (*p != 0) p++; /* non input consuming */ |
| 72 | return(xmlStrndup(cur, p - cur)); |
| 73 | } |
| 74 | |
| 75 | /** |
| 76 | * xmlCharStrndup: |
| 77 | * @cur: the input char * |
| 78 | * @len: the len of @cur |
| 79 | * |
| 80 | * a strndup for char's to xmlChar's |
| 81 | * |
| 82 | * Returns a new xmlChar * or NULL |
| 83 | */ |
| 84 | |
| 85 | xmlChar * |
| 86 | xmlCharStrndup(const char *cur, int len) { |
| 87 | int i; |
| 88 | xmlChar *ret; |
Daniel Veillard | f8e3db0 | 2012-09-11 13:26:36 +0800 | [diff] [blame] | 89 | |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 90 | if ((cur == NULL) || (len < 0)) return(NULL); |
Elliott Hughes | ecdab2a | 2022-02-23 14:33:50 -0800 | [diff] [blame] | 91 | ret = (xmlChar *) xmlMallocAtomic(((size_t) len + 1) * sizeof(xmlChar)); |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 92 | if (ret == NULL) { |
| 93 | xmlErrMemory(NULL, NULL); |
| 94 | return(NULL); |
| 95 | } |
Daniel Veillard | 5ea30d7 | 2004-11-08 11:54:28 +0000 | [diff] [blame] | 96 | for (i = 0;i < len;i++) { |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 97 | ret[i] = (xmlChar) cur[i]; |
Daniel Veillard | 5ea30d7 | 2004-11-08 11:54:28 +0000 | [diff] [blame] | 98 | if (ret[i] == 0) return(ret); |
| 99 | } |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 100 | ret[len] = 0; |
| 101 | return(ret); |
| 102 | } |
| 103 | |
| 104 | /** |
| 105 | * xmlCharStrdup: |
| 106 | * @cur: the input char * |
| 107 | * |
| 108 | * a strdup for char's to xmlChar's |
| 109 | * |
| 110 | * Returns a new xmlChar * or NULL |
| 111 | */ |
| 112 | |
| 113 | xmlChar * |
| 114 | xmlCharStrdup(const char *cur) { |
| 115 | const char *p = cur; |
| 116 | |
| 117 | if (cur == NULL) return(NULL); |
| 118 | while (*p != '\0') p++; /* non input consuming */ |
| 119 | return(xmlCharStrndup(cur, p - cur)); |
| 120 | } |
| 121 | |
| 122 | /** |
| 123 | * xmlStrcmp: |
| 124 | * @str1: the first xmlChar * |
| 125 | * @str2: the second xmlChar * |
| 126 | * |
| 127 | * a strcmp for xmlChar's |
| 128 | * |
| 129 | * Returns the integer result of the comparison |
| 130 | */ |
| 131 | |
| 132 | int |
| 133 | xmlStrcmp(const xmlChar *str1, const xmlChar *str2) { |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 134 | if (str1 == str2) return(0); |
| 135 | if (str1 == NULL) return(-1); |
| 136 | if (str2 == NULL) return(1); |
Haibo Huang | f0a546b | 2020-09-01 20:28:19 -0700 | [diff] [blame] | 137 | #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION |
| 138 | return(strcmp((const char *)str1, (const char *)str2)); |
| 139 | #else |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 140 | do { |
Haibo Huang | f0a546b | 2020-09-01 20:28:19 -0700 | [diff] [blame] | 141 | int tmp = *str1++ - *str2; |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 142 | if (tmp != 0) return(tmp); |
| 143 | } while (*str2++ != 0); |
| 144 | return 0; |
Haibo Huang | f0a546b | 2020-09-01 20:28:19 -0700 | [diff] [blame] | 145 | #endif |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 146 | } |
| 147 | |
| 148 | /** |
| 149 | * xmlStrEqual: |
| 150 | * @str1: the first xmlChar * |
| 151 | * @str2: the second xmlChar * |
| 152 | * |
Daniel Veillard | d95ecf0 | 2005-12-22 14:58:32 +0000 | [diff] [blame] | 153 | * Check if both strings are equal of have same content. |
Daniel Veillard | 6a0baa0 | 2005-12-10 11:11:12 +0000 | [diff] [blame] | 154 | * Should be a bit more readable and faster than xmlStrcmp() |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 155 | * |
| 156 | * Returns 1 if they are equal, 0 if they are different |
| 157 | */ |
| 158 | |
| 159 | int |
| 160 | xmlStrEqual(const xmlChar *str1, const xmlChar *str2) { |
| 161 | if (str1 == str2) return(1); |
| 162 | if (str1 == NULL) return(0); |
| 163 | if (str2 == NULL) return(0); |
Haibo Huang | f0a546b | 2020-09-01 20:28:19 -0700 | [diff] [blame] | 164 | #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION |
| 165 | return(strcmp((const char *)str1, (const char *)str2) == 0); |
| 166 | #else |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 167 | do { |
| 168 | if (*str1++ != *str2) return(0); |
| 169 | } while (*str2++); |
| 170 | return(1); |
Haibo Huang | f0a546b | 2020-09-01 20:28:19 -0700 | [diff] [blame] | 171 | #endif |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 172 | } |
| 173 | |
| 174 | /** |
| 175 | * xmlStrQEqual: |
| 176 | * @pref: the prefix of the QName |
| 177 | * @name: the localname of the QName |
| 178 | * @str: the second xmlChar * |
| 179 | * |
Daniel Veillard | f8e3db0 | 2012-09-11 13:26:36 +0800 | [diff] [blame] | 180 | * Check if a QName is Equal to a given string |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 181 | * |
| 182 | * Returns 1 if they are equal, 0 if they are different |
| 183 | */ |
| 184 | |
| 185 | int |
| 186 | xmlStrQEqual(const xmlChar *pref, const xmlChar *name, const xmlChar *str) { |
| 187 | if (pref == NULL) return(xmlStrEqual(name, str)); |
| 188 | if (name == NULL) return(0); |
| 189 | if (str == NULL) return(0); |
| 190 | |
| 191 | do { |
| 192 | if (*pref++ != *str) return(0); |
| 193 | } while ((*str++) && (*pref)); |
| 194 | if (*str++ != ':') return(0); |
| 195 | do { |
| 196 | if (*name++ != *str) return(0); |
| 197 | } while (*str++); |
| 198 | return(1); |
| 199 | } |
| 200 | |
| 201 | /** |
| 202 | * xmlStrncmp: |
| 203 | * @str1: the first xmlChar * |
| 204 | * @str2: the second xmlChar * |
| 205 | * @len: the max comparison length |
| 206 | * |
| 207 | * a strncmp for xmlChar's |
| 208 | * |
| 209 | * Returns the integer result of the comparison |
| 210 | */ |
| 211 | |
| 212 | int |
| 213 | xmlStrncmp(const xmlChar *str1, const xmlChar *str2, int len) { |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 214 | if (len <= 0) return(0); |
| 215 | if (str1 == str2) return(0); |
| 216 | if (str1 == NULL) return(-1); |
| 217 | if (str2 == NULL) return(1); |
Haibo Huang | f0a546b | 2020-09-01 20:28:19 -0700 | [diff] [blame] | 218 | #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION |
| 219 | return(strncmp((const char *)str1, (const char *)str2, len)); |
Daniel Veillard | c82c57e | 2004-01-12 16:24:34 +0000 | [diff] [blame] | 220 | #else |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 221 | do { |
Haibo Huang | f0a546b | 2020-09-01 20:28:19 -0700 | [diff] [blame] | 222 | int tmp = *str1++ - *str2; |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 223 | if (tmp != 0 || --len == 0) return(tmp); |
| 224 | } while (*str2++ != 0); |
| 225 | return 0; |
Daniel Veillard | c82c57e | 2004-01-12 16:24:34 +0000 | [diff] [blame] | 226 | #endif |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 227 | } |
| 228 | |
| 229 | static const xmlChar casemap[256] = { |
| 230 | 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07, |
| 231 | 0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F, |
| 232 | 0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17, |
| 233 | 0x18,0x19,0x1A,0x1B,0x1C,0x1D,0x1E,0x1F, |
| 234 | 0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27, |
| 235 | 0x28,0x29,0x2A,0x2B,0x2C,0x2D,0x2E,0x2F, |
| 236 | 0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37, |
| 237 | 0x38,0x39,0x3A,0x3B,0x3C,0x3D,0x3E,0x3F, |
| 238 | 0x40,0x61,0x62,0x63,0x64,0x65,0x66,0x67, |
| 239 | 0x68,0x69,0x6A,0x6B,0x6C,0x6D,0x6E,0x6F, |
| 240 | 0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77, |
| 241 | 0x78,0x79,0x7A,0x7B,0x5C,0x5D,0x5E,0x5F, |
| 242 | 0x60,0x61,0x62,0x63,0x64,0x65,0x66,0x67, |
| 243 | 0x68,0x69,0x6A,0x6B,0x6C,0x6D,0x6E,0x6F, |
| 244 | 0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77, |
| 245 | 0x78,0x79,0x7A,0x7B,0x7C,0x7D,0x7E,0x7F, |
| 246 | 0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87, |
| 247 | 0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, |
| 248 | 0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97, |
| 249 | 0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, |
| 250 | 0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7, |
| 251 | 0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, |
| 252 | 0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7, |
| 253 | 0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, |
| 254 | 0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7, |
| 255 | 0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, |
| 256 | 0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7, |
| 257 | 0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, |
| 258 | 0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7, |
| 259 | 0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, |
| 260 | 0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7, |
| 261 | 0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF |
| 262 | }; |
| 263 | |
| 264 | /** |
| 265 | * xmlStrcasecmp: |
| 266 | * @str1: the first xmlChar * |
| 267 | * @str2: the second xmlChar * |
| 268 | * |
| 269 | * a strcasecmp for xmlChar's |
| 270 | * |
| 271 | * Returns the integer result of the comparison |
| 272 | */ |
| 273 | |
| 274 | int |
| 275 | xmlStrcasecmp(const xmlChar *str1, const xmlChar *str2) { |
| 276 | register int tmp; |
| 277 | |
| 278 | if (str1 == str2) return(0); |
| 279 | if (str1 == NULL) return(-1); |
| 280 | if (str2 == NULL) return(1); |
| 281 | do { |
| 282 | tmp = casemap[*str1++] - casemap[*str2]; |
| 283 | if (tmp != 0) return(tmp); |
| 284 | } while (*str2++ != 0); |
| 285 | return 0; |
| 286 | } |
| 287 | |
| 288 | /** |
| 289 | * xmlStrncasecmp: |
| 290 | * @str1: the first xmlChar * |
| 291 | * @str2: the second xmlChar * |
| 292 | * @len: the max comparison length |
| 293 | * |
| 294 | * a strncasecmp for xmlChar's |
| 295 | * |
| 296 | * Returns the integer result of the comparison |
| 297 | */ |
| 298 | |
| 299 | int |
| 300 | xmlStrncasecmp(const xmlChar *str1, const xmlChar *str2, int len) { |
| 301 | register int tmp; |
| 302 | |
| 303 | if (len <= 0) return(0); |
| 304 | if (str1 == str2) return(0); |
| 305 | if (str1 == NULL) return(-1); |
| 306 | if (str2 == NULL) return(1); |
| 307 | do { |
| 308 | tmp = casemap[*str1++] - casemap[*str2]; |
| 309 | if (tmp != 0 || --len == 0) return(tmp); |
| 310 | } while (*str2++ != 0); |
| 311 | return 0; |
| 312 | } |
| 313 | |
| 314 | /** |
| 315 | * xmlStrchr: |
| 316 | * @str: the xmlChar * array |
| 317 | * @val: the xmlChar to search |
| 318 | * |
| 319 | * a strchr for xmlChar's |
| 320 | * |
| 321 | * Returns the xmlChar * for the first occurrence or NULL. |
| 322 | */ |
| 323 | |
| 324 | const xmlChar * |
| 325 | xmlStrchr(const xmlChar *str, xmlChar val) { |
| 326 | if (str == NULL) return(NULL); |
| 327 | while (*str != 0) { /* non input consuming */ |
| 328 | if (*str == val) return((xmlChar *) str); |
| 329 | str++; |
| 330 | } |
| 331 | return(NULL); |
| 332 | } |
| 333 | |
| 334 | /** |
| 335 | * xmlStrstr: |
| 336 | * @str: the xmlChar * array (haystack) |
| 337 | * @val: the xmlChar to search (needle) |
| 338 | * |
| 339 | * a strstr for xmlChar's |
| 340 | * |
| 341 | * Returns the xmlChar * for the first occurrence or NULL. |
| 342 | */ |
| 343 | |
| 344 | const xmlChar * |
| 345 | xmlStrstr(const xmlChar *str, const xmlChar *val) { |
| 346 | int n; |
Daniel Veillard | f8e3db0 | 2012-09-11 13:26:36 +0800 | [diff] [blame] | 347 | |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 348 | if (str == NULL) return(NULL); |
| 349 | if (val == NULL) return(NULL); |
| 350 | n = xmlStrlen(val); |
| 351 | |
| 352 | if (n == 0) return(str); |
| 353 | while (*str != 0) { /* non input consuming */ |
| 354 | if (*str == *val) { |
| 355 | if (!xmlStrncmp(str, val, n)) return((const xmlChar *) str); |
| 356 | } |
| 357 | str++; |
| 358 | } |
| 359 | return(NULL); |
| 360 | } |
| 361 | |
| 362 | /** |
| 363 | * xmlStrcasestr: |
| 364 | * @str: the xmlChar * array (haystack) |
| 365 | * @val: the xmlChar to search (needle) |
| 366 | * |
| 367 | * a case-ignoring strstr for xmlChar's |
| 368 | * |
| 369 | * Returns the xmlChar * for the first occurrence or NULL. |
| 370 | */ |
| 371 | |
| 372 | const xmlChar * |
Daniel Veillard | fcf2457 | 2009-08-12 23:02:08 +0200 | [diff] [blame] | 373 | xmlStrcasestr(const xmlChar *str, const xmlChar *val) { |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 374 | int n; |
Daniel Veillard | f8e3db0 | 2012-09-11 13:26:36 +0800 | [diff] [blame] | 375 | |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 376 | if (str == NULL) return(NULL); |
| 377 | if (val == NULL) return(NULL); |
| 378 | n = xmlStrlen(val); |
| 379 | |
| 380 | if (n == 0) return(str); |
| 381 | while (*str != 0) { /* non input consuming */ |
| 382 | if (casemap[*str] == casemap[*val]) |
| 383 | if (!xmlStrncasecmp(str, val, n)) return(str); |
| 384 | str++; |
| 385 | } |
| 386 | return(NULL); |
| 387 | } |
| 388 | |
| 389 | /** |
| 390 | * xmlStrsub: |
| 391 | * @str: the xmlChar * array (haystack) |
| 392 | * @start: the index of the first char (zero based) |
| 393 | * @len: the length of the substring |
| 394 | * |
| 395 | * Extract a substring of a given string |
| 396 | * |
| 397 | * Returns the xmlChar * for the first occurrence or NULL. |
| 398 | */ |
| 399 | |
| 400 | xmlChar * |
| 401 | xmlStrsub(const xmlChar *str, int start, int len) { |
| 402 | int i; |
Daniel Veillard | f8e3db0 | 2012-09-11 13:26:36 +0800 | [diff] [blame] | 403 | |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 404 | if (str == NULL) return(NULL); |
| 405 | if (start < 0) return(NULL); |
| 406 | if (len < 0) return(NULL); |
| 407 | |
| 408 | for (i = 0;i < start;i++) { |
| 409 | if (*str == 0) return(NULL); |
| 410 | str++; |
| 411 | } |
| 412 | if (*str == 0) return(NULL); |
| 413 | return(xmlStrndup(str, len)); |
| 414 | } |
| 415 | |
| 416 | /** |
| 417 | * xmlStrlen: |
| 418 | * @str: the xmlChar * array |
| 419 | * |
| 420 | * length of a xmlChar's string |
| 421 | * |
| 422 | * Returns the number of xmlChar contained in the ARRAY. |
| 423 | */ |
| 424 | |
| 425 | int |
| 426 | xmlStrlen(const xmlChar *str) { |
Elliott Hughes | ecdab2a | 2022-02-23 14:33:50 -0800 | [diff] [blame] | 427 | size_t len = 0; |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 428 | |
| 429 | if (str == NULL) return(0); |
| 430 | while (*str != 0) { /* non input consuming */ |
| 431 | str++; |
| 432 | len++; |
| 433 | } |
Elliott Hughes | ecdab2a | 2022-02-23 14:33:50 -0800 | [diff] [blame] | 434 | return(len > INT_MAX ? 0 : len); |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 435 | } |
| 436 | |
| 437 | /** |
| 438 | * xmlStrncat: |
| 439 | * @cur: the original xmlChar * array |
| 440 | * @add: the xmlChar * array added |
| 441 | * @len: the length of @add |
| 442 | * |
| 443 | * a strncat for array of xmlChar's, it will extend @cur with the len |
Kasimier T. Buchcik | 5bb0c08 | 2005-12-20 10:48:33 +0000 | [diff] [blame] | 444 | * first bytes of @add. Note that if @len < 0 then this is an API error |
| 445 | * and NULL will be returned. |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 446 | * |
Nick Wellnhofer | 5a0ae66 | 2017-06-17 23:20:38 +0200 | [diff] [blame] | 447 | * Returns a new xmlChar *, the original @cur is reallocated and should |
| 448 | * not be freed. |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 449 | */ |
| 450 | |
| 451 | xmlChar * |
| 452 | xmlStrncat(xmlChar *cur, const xmlChar *add, int len) { |
| 453 | int size; |
| 454 | xmlChar *ret; |
| 455 | |
| 456 | if ((add == NULL) || (len == 0)) |
| 457 | return(cur); |
Kasimier T. Buchcik | 5bb0c08 | 2005-12-20 10:48:33 +0000 | [diff] [blame] | 458 | if (len < 0) |
| 459 | return(NULL); |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 460 | if (cur == NULL) |
| 461 | return(xmlStrndup(add, len)); |
| 462 | |
| 463 | size = xmlStrlen(cur); |
Elliott Hughes | ecdab2a | 2022-02-23 14:33:50 -0800 | [diff] [blame] | 464 | if ((size < 0) || (size > INT_MAX - len)) |
Pranjal Jumde | 8fbbf55 | 2016-03-08 17:29:00 -0800 | [diff] [blame] | 465 | return(NULL); |
Elliott Hughes | ecdab2a | 2022-02-23 14:33:50 -0800 | [diff] [blame] | 466 | ret = (xmlChar *) xmlRealloc(cur, ((size_t) size + len + 1) * sizeof(xmlChar)); |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 467 | if (ret == NULL) { |
| 468 | xmlErrMemory(NULL, NULL); |
| 469 | return(cur); |
| 470 | } |
| 471 | memcpy(&ret[size], add, len * sizeof(xmlChar)); |
| 472 | ret[size + len] = 0; |
| 473 | return(ret); |
| 474 | } |
| 475 | |
| 476 | /** |
| 477 | * xmlStrncatNew: |
| 478 | * @str1: first xmlChar string |
| 479 | * @str2: second xmlChar string |
Kasimier T. Buchcik | 5bb0c08 | 2005-12-20 10:48:33 +0000 | [diff] [blame] | 480 | * @len: the len of @str2 or < 0 |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 481 | * |
| 482 | * same as xmlStrncat, but creates a new string. The original |
Kasimier T. Buchcik | 5bb0c08 | 2005-12-20 10:48:33 +0000 | [diff] [blame] | 483 | * two strings are not freed. If @len is < 0 then the length |
| 484 | * will be calculated automatically. |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 485 | * |
| 486 | * Returns a new xmlChar * or NULL |
| 487 | */ |
| 488 | xmlChar * |
| 489 | xmlStrncatNew(const xmlChar *str1, const xmlChar *str2, int len) { |
| 490 | int size; |
| 491 | xmlChar *ret; |
| 492 | |
Pranjal Jumde | 8fbbf55 | 2016-03-08 17:29:00 -0800 | [diff] [blame] | 493 | if (len < 0) { |
Daniel Veillard | 8a32fe4 | 2004-11-02 22:10:16 +0000 | [diff] [blame] | 494 | len = xmlStrlen(str2); |
Pranjal Jumde | 8fbbf55 | 2016-03-08 17:29:00 -0800 | [diff] [blame] | 495 | if (len < 0) |
| 496 | return(NULL); |
| 497 | } |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 498 | if ((str2 == NULL) || (len == 0)) |
| 499 | return(xmlStrdup(str1)); |
| 500 | if (str1 == NULL) |
| 501 | return(xmlStrndup(str2, len)); |
| 502 | |
| 503 | size = xmlStrlen(str1); |
Elliott Hughes | ecdab2a | 2022-02-23 14:33:50 -0800 | [diff] [blame] | 504 | if ((size < 0) || (size > INT_MAX - len)) |
Pranjal Jumde | 8fbbf55 | 2016-03-08 17:29:00 -0800 | [diff] [blame] | 505 | return(NULL); |
Elliott Hughes | ecdab2a | 2022-02-23 14:33:50 -0800 | [diff] [blame] | 506 | ret = (xmlChar *) xmlMalloc(((size_t) size + len + 1) * sizeof(xmlChar)); |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 507 | if (ret == NULL) { |
| 508 | xmlErrMemory(NULL, NULL); |
| 509 | return(xmlStrndup(str1, size)); |
| 510 | } |
| 511 | memcpy(ret, str1, size * sizeof(xmlChar)); |
| 512 | memcpy(&ret[size], str2, len * sizeof(xmlChar)); |
| 513 | ret[size + len] = 0; |
| 514 | return(ret); |
| 515 | } |
| 516 | |
| 517 | /** |
| 518 | * xmlStrcat: |
| 519 | * @cur: the original xmlChar * array |
| 520 | * @add: the xmlChar * array added |
| 521 | * |
| 522 | * a strcat for array of xmlChar's. Since they are supposed to be |
| 523 | * encoded in UTF-8 or an encoding with 8bit based chars, we assume |
| 524 | * a termination mark of '0'. |
| 525 | * |
Nick Wellnhofer | 5a0ae66 | 2017-06-17 23:20:38 +0200 | [diff] [blame] | 526 | * Returns a new xmlChar * containing the concatenated string. The original |
| 527 | * @cur is reallocated and should not be freed. |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 528 | */ |
| 529 | xmlChar * |
| 530 | xmlStrcat(xmlChar *cur, const xmlChar *add) { |
| 531 | const xmlChar *p = add; |
| 532 | |
| 533 | if (add == NULL) return(cur); |
Daniel Veillard | f8e3db0 | 2012-09-11 13:26:36 +0800 | [diff] [blame] | 534 | if (cur == NULL) |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 535 | return(xmlStrdup(add)); |
| 536 | |
| 537 | while (*p != 0) p++; /* non input consuming */ |
| 538 | return(xmlStrncat(cur, add, p - add)); |
| 539 | } |
| 540 | |
| 541 | /** |
| 542 | * xmlStrPrintf: |
| 543 | * @buf: the result buffer. |
| 544 | * @len: the result buffer length. |
| 545 | * @msg: the message with printf formatting. |
| 546 | * @...: extra parameters for the message. |
| 547 | * |
| 548 | * Formats @msg and places result into @buf. |
| 549 | * |
| 550 | * Returns the number of characters written to @buf or -1 if an error occurs. |
| 551 | */ |
Daniel Veillard | f8e3db0 | 2012-09-11 13:26:36 +0800 | [diff] [blame] | 552 | int XMLCDECL |
David Kilzer | 4472c3a | 2016-05-13 15:13:17 +0800 | [diff] [blame] | 553 | xmlStrPrintf(xmlChar *buf, int len, const char *msg, ...) { |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 554 | va_list args; |
| 555 | int ret; |
Daniel Veillard | f8e3db0 | 2012-09-11 13:26:36 +0800 | [diff] [blame] | 556 | |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 557 | if((buf == NULL) || (msg == NULL)) { |
| 558 | return(-1); |
| 559 | } |
Daniel Veillard | f8e3db0 | 2012-09-11 13:26:36 +0800 | [diff] [blame] | 560 | |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 561 | va_start(args, msg); |
| 562 | ret = vsnprintf((char *) buf, len, (const char *) msg, args); |
| 563 | va_end(args); |
| 564 | buf[len - 1] = 0; /* be safe ! */ |
Daniel Veillard | f8e3db0 | 2012-09-11 13:26:36 +0800 | [diff] [blame] | 565 | |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 566 | return(ret); |
| 567 | } |
| 568 | |
| 569 | /** |
| 570 | * xmlStrVPrintf: |
| 571 | * @buf: the result buffer. |
| 572 | * @len: the result buffer length. |
| 573 | * @msg: the message with printf formatting. |
| 574 | * @ap: extra parameters for the message. |
| 575 | * |
| 576 | * Formats @msg and places result into @buf. |
| 577 | * |
| 578 | * Returns the number of characters written to @buf or -1 if an error occurs. |
| 579 | */ |
Daniel Veillard | f8e3db0 | 2012-09-11 13:26:36 +0800 | [diff] [blame] | 580 | int |
David Kilzer | 4472c3a | 2016-05-13 15:13:17 +0800 | [diff] [blame] | 581 | xmlStrVPrintf(xmlChar *buf, int len, const char *msg, va_list ap) { |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 582 | int ret; |
Daniel Veillard | f8e3db0 | 2012-09-11 13:26:36 +0800 | [diff] [blame] | 583 | |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 584 | if((buf == NULL) || (msg == NULL)) { |
| 585 | return(-1); |
| 586 | } |
Daniel Veillard | f8e3db0 | 2012-09-11 13:26:36 +0800 | [diff] [blame] | 587 | |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 588 | ret = vsnprintf((char *) buf, len, (const char *) msg, ap); |
| 589 | buf[len - 1] = 0; /* be safe ! */ |
Daniel Veillard | f8e3db0 | 2012-09-11 13:26:36 +0800 | [diff] [blame] | 590 | |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 591 | return(ret); |
| 592 | } |
| 593 | |
| 594 | /************************************************************************ |
| 595 | * * |
| 596 | * Generic UTF8 handling routines * |
| 597 | * * |
| 598 | * From rfc2044: encoding of the Unicode values on UTF-8: * |
| 599 | * * |
| 600 | * UCS-4 range (hex.) UTF-8 octet sequence (binary) * |
| 601 | * 0000 0000-0000 007F 0xxxxxxx * |
| 602 | * 0000 0080-0000 07FF 110xxxxx 10xxxxxx * |
| 603 | * 0000 0800-0000 FFFF 1110xxxx 10xxxxxx 10xxxxxx * |
| 604 | * * |
| 605 | * I hope we won't use values > 0xFFFF anytime soon ! * |
| 606 | * * |
| 607 | ************************************************************************/ |
| 608 | |
| 609 | |
| 610 | /** |
| 611 | * xmlUTF8Size: |
| 612 | * @utf: pointer to the UTF8 character |
| 613 | * |
| 614 | * calculates the internal size of a UTF8 character |
| 615 | * |
| 616 | * returns the numbers of bytes in the character, -1 on format error |
| 617 | */ |
| 618 | int |
| 619 | xmlUTF8Size(const xmlChar *utf) { |
| 620 | xmlChar mask; |
| 621 | int len; |
| 622 | |
| 623 | if (utf == NULL) |
| 624 | return -1; |
| 625 | if (*utf < 0x80) |
| 626 | return 1; |
| 627 | /* check valid UTF8 character */ |
| 628 | if (!(*utf & 0x40)) |
| 629 | return -1; |
| 630 | /* determine number of bytes in char */ |
| 631 | len = 2; |
| 632 | for (mask=0x20; mask != 0; mask>>=1) { |
| 633 | if (!(*utf & mask)) |
| 634 | return len; |
| 635 | len++; |
| 636 | } |
| 637 | return -1; |
| 638 | } |
| 639 | |
| 640 | /** |
| 641 | * xmlUTF8Charcmp: |
| 642 | * @utf1: pointer to first UTF8 char |
| 643 | * @utf2: pointer to second UTF8 char |
| 644 | * |
| 645 | * compares the two UCS4 values |
| 646 | * |
| 647 | * returns result of the compare as with xmlStrncmp |
| 648 | */ |
| 649 | int |
| 650 | xmlUTF8Charcmp(const xmlChar *utf1, const xmlChar *utf2) { |
| 651 | |
| 652 | if (utf1 == NULL ) { |
| 653 | if (utf2 == NULL) |
| 654 | return 0; |
| 655 | return -1; |
| 656 | } |
| 657 | return xmlStrncmp(utf1, utf2, xmlUTF8Size(utf1)); |
| 658 | } |
| 659 | |
| 660 | /** |
| 661 | * xmlUTF8Strlen: |
| 662 | * @utf: a sequence of UTF-8 encoded bytes |
| 663 | * |
| 664 | * compute the length of an UTF8 string, it doesn't do a full UTF8 |
| 665 | * checking of the content of the string. |
| 666 | * |
| 667 | * Returns the number of characters in the string or -1 in case of error |
| 668 | */ |
| 669 | int |
| 670 | xmlUTF8Strlen(const xmlChar *utf) { |
Elliott Hughes | ecdab2a | 2022-02-23 14:33:50 -0800 | [diff] [blame] | 671 | size_t ret = 0; |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 672 | |
| 673 | if (utf == NULL) |
| 674 | return(-1); |
| 675 | |
| 676 | while (*utf != 0) { |
| 677 | if (utf[0] & 0x80) { |
| 678 | if ((utf[1] & 0xc0) != 0x80) |
| 679 | return(-1); |
| 680 | if ((utf[0] & 0xe0) == 0xe0) { |
| 681 | if ((utf[2] & 0xc0) != 0x80) |
| 682 | return(-1); |
| 683 | if ((utf[0] & 0xf0) == 0xf0) { |
| 684 | if ((utf[0] & 0xf8) != 0xf0 || (utf[3] & 0xc0) != 0x80) |
| 685 | return(-1); |
| 686 | utf += 4; |
| 687 | } else { |
| 688 | utf += 3; |
| 689 | } |
| 690 | } else { |
| 691 | utf += 2; |
| 692 | } |
| 693 | } else { |
| 694 | utf++; |
| 695 | } |
| 696 | ret++; |
| 697 | } |
Elliott Hughes | ecdab2a | 2022-02-23 14:33:50 -0800 | [diff] [blame] | 698 | return(ret > INT_MAX ? 0 : ret); |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 699 | } |
| 700 | |
| 701 | /** |
| 702 | * xmlGetUTF8Char: |
| 703 | * @utf: a sequence of UTF-8 encoded bytes |
William M. Brack | 3e53016 | 2004-09-03 17:10:08 +0000 | [diff] [blame] | 704 | * @len: a pointer to the minimum number of bytes present in |
| 705 | * the sequence. This is used to assure the next character |
| 706 | * is completely contained within the sequence. |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 707 | * |
William M. Brack | 3e53016 | 2004-09-03 17:10:08 +0000 | [diff] [blame] | 708 | * Read the first UTF8 character from @utf |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 709 | * |
William M. Brack | 3e53016 | 2004-09-03 17:10:08 +0000 | [diff] [blame] | 710 | * Returns the char value or -1 in case of error, and sets *len to |
| 711 | * the actual number of bytes consumed (0 in case of error) |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 712 | */ |
| 713 | int |
| 714 | xmlGetUTF8Char(const unsigned char *utf, int *len) { |
| 715 | unsigned int c; |
| 716 | |
| 717 | if (utf == NULL) |
| 718 | goto error; |
| 719 | if (len == NULL) |
| 720 | goto error; |
| 721 | if (*len < 1) |
| 722 | goto error; |
| 723 | |
| 724 | c = utf[0]; |
| 725 | if (c & 0x80) { |
| 726 | if (*len < 2) |
| 727 | goto error; |
| 728 | if ((utf[1] & 0xc0) != 0x80) |
| 729 | goto error; |
| 730 | if ((c & 0xe0) == 0xe0) { |
| 731 | if (*len < 3) |
| 732 | goto error; |
| 733 | if ((utf[2] & 0xc0) != 0x80) |
| 734 | goto error; |
| 735 | if ((c & 0xf0) == 0xf0) { |
| 736 | if (*len < 4) |
| 737 | goto error; |
| 738 | if ((c & 0xf8) != 0xf0 || (utf[3] & 0xc0) != 0x80) |
| 739 | goto error; |
| 740 | *len = 4; |
| 741 | /* 4-byte code */ |
| 742 | c = (utf[0] & 0x7) << 18; |
| 743 | c |= (utf[1] & 0x3f) << 12; |
| 744 | c |= (utf[2] & 0x3f) << 6; |
| 745 | c |= utf[3] & 0x3f; |
| 746 | } else { |
| 747 | /* 3-byte code */ |
| 748 | *len = 3; |
| 749 | c = (utf[0] & 0xf) << 12; |
| 750 | c |= (utf[1] & 0x3f) << 6; |
| 751 | c |= utf[2] & 0x3f; |
| 752 | } |
| 753 | } else { |
| 754 | /* 2-byte code */ |
| 755 | *len = 2; |
| 756 | c = (utf[0] & 0x1f) << 6; |
| 757 | c |= utf[1] & 0x3f; |
| 758 | } |
| 759 | } else { |
| 760 | /* 1-byte code */ |
| 761 | *len = 1; |
| 762 | } |
| 763 | return(c); |
| 764 | |
| 765 | error: |
Daniel Veillard | ce682bc | 2004-11-05 17:22:25 +0000 | [diff] [blame] | 766 | if (len != NULL) |
| 767 | *len = 0; |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 768 | return(-1); |
| 769 | } |
| 770 | |
| 771 | /** |
| 772 | * xmlCheckUTF8: |
| 773 | * @utf: Pointer to putative UTF-8 encoded string. |
| 774 | * |
| 775 | * Checks @utf for being valid UTF-8. @utf is assumed to be |
| 776 | * null-terminated. This function is not super-strict, as it will |
| 777 | * allow longer UTF-8 sequences than necessary. Note that Java is |
| 778 | * capable of producing these sequences if provoked. Also note, this |
| 779 | * routine checks for the 4-byte maximum size, but does not check for |
| 780 | * 0x10ffff maximum value. |
| 781 | * |
| 782 | * Return value: true if @utf is valid. |
| 783 | **/ |
| 784 | int |
| 785 | xmlCheckUTF8(const unsigned char *utf) |
| 786 | { |
| 787 | int ix; |
| 788 | unsigned char c; |
| 789 | |
Daniel Veillard | ce682bc | 2004-11-05 17:22:25 +0000 | [diff] [blame] | 790 | if (utf == NULL) |
| 791 | return(0); |
William M. Brack | 3ffe90e | 2004-08-28 01:33:30 +0000 | [diff] [blame] | 792 | /* |
| 793 | * utf is a string of 1, 2, 3 or 4 bytes. The valid strings |
| 794 | * are as follows (in "bit format"): |
| 795 | * 0xxxxxxx valid 1-byte |
| 796 | * 110xxxxx 10xxxxxx valid 2-byte |
| 797 | * 1110xxxx 10xxxxxx 10xxxxxx valid 3-byte |
| 798 | * 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx valid 4-byte |
| 799 | */ |
Elliott Hughes | ecdab2a | 2022-02-23 14:33:50 -0800 | [diff] [blame] | 800 | while ((c = utf[0])) { /* string is 0-terminated */ |
| 801 | ix = 0; |
William M. Brack | f409515 | 2004-08-31 16:49:26 +0000 | [diff] [blame] | 802 | if ((c & 0x80) == 0x00) { /* 1-byte code, starts with 10 */ |
Elliott Hughes | ecdab2a | 2022-02-23 14:33:50 -0800 | [diff] [blame] | 803 | ix = 1; |
William M. Brack | bf5cf21 | 2004-08-31 06:47:17 +0000 | [diff] [blame] | 804 | } else if ((c & 0xe0) == 0xc0) {/* 2-byte code, starts with 110 */ |
Elliott Hughes | ecdab2a | 2022-02-23 14:33:50 -0800 | [diff] [blame] | 805 | if ((utf[1] & 0xc0 ) != 0x80) |
William M. Brack | bf5cf21 | 2004-08-31 06:47:17 +0000 | [diff] [blame] | 806 | return 0; |
Elliott Hughes | ecdab2a | 2022-02-23 14:33:50 -0800 | [diff] [blame] | 807 | ix = 2; |
William M. Brack | bf5cf21 | 2004-08-31 06:47:17 +0000 | [diff] [blame] | 808 | } else if ((c & 0xf0) == 0xe0) {/* 3-byte code, starts with 1110 */ |
Elliott Hughes | ecdab2a | 2022-02-23 14:33:50 -0800 | [diff] [blame] | 809 | if (((utf[1] & 0xc0) != 0x80) || |
| 810 | ((utf[2] & 0xc0) != 0x80)) |
William M. Brack | bf5cf21 | 2004-08-31 06:47:17 +0000 | [diff] [blame] | 811 | return 0; |
Elliott Hughes | ecdab2a | 2022-02-23 14:33:50 -0800 | [diff] [blame] | 812 | ix = 3; |
William M. Brack | bf5cf21 | 2004-08-31 06:47:17 +0000 | [diff] [blame] | 813 | } else if ((c & 0xf8) == 0xf0) {/* 4-byte code, starts with 11110 */ |
Elliott Hughes | ecdab2a | 2022-02-23 14:33:50 -0800 | [diff] [blame] | 814 | if (((utf[1] & 0xc0) != 0x80) || |
| 815 | ((utf[2] & 0xc0) != 0x80) || |
| 816 | ((utf[3] & 0xc0) != 0x80)) |
William M. Brack | bf5cf21 | 2004-08-31 06:47:17 +0000 | [diff] [blame] | 817 | return 0; |
Elliott Hughes | ecdab2a | 2022-02-23 14:33:50 -0800 | [diff] [blame] | 818 | ix = 4; |
William M. Brack | bf5cf21 | 2004-08-31 06:47:17 +0000 | [diff] [blame] | 819 | } else /* unknown encoding */ |
| 820 | return 0; |
Elliott Hughes | ecdab2a | 2022-02-23 14:33:50 -0800 | [diff] [blame] | 821 | utf += ix; |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 822 | } |
| 823 | return(1); |
| 824 | } |
| 825 | |
| 826 | /** |
| 827 | * xmlUTF8Strsize: |
| 828 | * @utf: a sequence of UTF-8 encoded bytes |
| 829 | * @len: the number of characters in the array |
| 830 | * |
| 831 | * storage size of an UTF8 string |
Nick Wellnhofer | 8bbe450 | 2017-06-17 16:15:09 +0200 | [diff] [blame] | 832 | * the behaviour is not guaranteed if the input string is not UTF-8 |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 833 | * |
| 834 | * Returns the storage size of |
| 835 | * the first 'len' characters of ARRAY |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 836 | */ |
| 837 | |
| 838 | int |
| 839 | xmlUTF8Strsize(const xmlChar *utf, int len) { |
Elliott Hughes | ecdab2a | 2022-02-23 14:33:50 -0800 | [diff] [blame] | 840 | const xmlChar *ptr=utf; |
| 841 | int ch; |
| 842 | size_t ret; |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 843 | |
Daniel Veillard | 36e5cd5 | 2004-11-02 14:52:23 +0000 | [diff] [blame] | 844 | if (utf == NULL) |
| 845 | return(0); |
| 846 | |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 847 | if (len <= 0) |
| 848 | return(0); |
| 849 | |
| 850 | while ( len-- > 0) { |
| 851 | if ( !*ptr ) |
| 852 | break; |
| 853 | if ( (ch = *ptr++) & 0x80) |
Daniel Veillard | 5ea30d7 | 2004-11-08 11:54:28 +0000 | [diff] [blame] | 854 | while ((ch<<=1) & 0x80 ) { |
Daniel Veillard | 5ea30d7 | 2004-11-08 11:54:28 +0000 | [diff] [blame] | 855 | if (*ptr == 0) break; |
Nick Wellnhofer | 96a5c17 | 2016-04-21 19:03:47 +0200 | [diff] [blame] | 856 | ptr++; |
Daniel Veillard | 5ea30d7 | 2004-11-08 11:54:28 +0000 | [diff] [blame] | 857 | } |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 858 | } |
Elliott Hughes | ecdab2a | 2022-02-23 14:33:50 -0800 | [diff] [blame] | 859 | ret = ptr - utf; |
| 860 | return (ret > INT_MAX ? 0 : ret); |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 861 | } |
| 862 | |
| 863 | |
| 864 | /** |
| 865 | * xmlUTF8Strndup: |
| 866 | * @utf: the input UTF8 * |
| 867 | * @len: the len of @utf (in chars) |
| 868 | * |
| 869 | * a strndup for array of UTF8's |
| 870 | * |
| 871 | * Returns a new UTF8 * or NULL |
| 872 | */ |
| 873 | xmlChar * |
| 874 | xmlUTF8Strndup(const xmlChar *utf, int len) { |
| 875 | xmlChar *ret; |
| 876 | int i; |
Daniel Veillard | f8e3db0 | 2012-09-11 13:26:36 +0800 | [diff] [blame] | 877 | |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 878 | if ((utf == NULL) || (len < 0)) return(NULL); |
| 879 | i = xmlUTF8Strsize(utf, len); |
Elliott Hughes | ecdab2a | 2022-02-23 14:33:50 -0800 | [diff] [blame] | 880 | ret = (xmlChar *) xmlMallocAtomic(((size_t) i + 1) * sizeof(xmlChar)); |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 881 | if (ret == NULL) { |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 882 | return(NULL); |
| 883 | } |
| 884 | memcpy(ret, utf, i * sizeof(xmlChar)); |
| 885 | ret[i] = 0; |
| 886 | return(ret); |
| 887 | } |
| 888 | |
| 889 | /** |
| 890 | * xmlUTF8Strpos: |
| 891 | * @utf: the input UTF8 * |
| 892 | * @pos: the position of the desired UTF8 char (in chars) |
| 893 | * |
| 894 | * a function to provide the equivalent of fetching a |
| 895 | * character from a string array |
| 896 | * |
| 897 | * Returns a pointer to the UTF8 character or NULL |
| 898 | */ |
Daniel Veillard | 8a32fe4 | 2004-11-02 22:10:16 +0000 | [diff] [blame] | 899 | const xmlChar * |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 900 | xmlUTF8Strpos(const xmlChar *utf, int pos) { |
Elliott Hughes | ecdab2a | 2022-02-23 14:33:50 -0800 | [diff] [blame] | 901 | int ch; |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 902 | |
| 903 | if (utf == NULL) return(NULL); |
William M. Brack | 230c550 | 2004-12-20 16:18:49 +0000 | [diff] [blame] | 904 | if (pos < 0) |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 905 | return(NULL); |
| 906 | while (pos--) { |
| 907 | if ((ch=*utf++) == 0) return(NULL); |
| 908 | if ( ch & 0x80 ) { |
| 909 | /* if not simple ascii, verify proper format */ |
| 910 | if ( (ch & 0xc0) != 0xc0 ) |
| 911 | return(NULL); |
| 912 | /* then skip over remaining bytes for this char */ |
| 913 | while ( (ch <<= 1) & 0x80 ) |
| 914 | if ( (*utf++ & 0xc0) != 0x80 ) |
| 915 | return(NULL); |
| 916 | } |
| 917 | } |
| 918 | return((xmlChar *)utf); |
| 919 | } |
| 920 | |
| 921 | /** |
| 922 | * xmlUTF8Strloc: |
| 923 | * @utf: the input UTF8 * |
| 924 | * @utfchar: the UTF8 character to be found |
| 925 | * |
| 926 | * a function to provide the relative location of a UTF8 char |
| 927 | * |
| 928 | * Returns the relative character position of the desired char |
| 929 | * or -1 if not found |
| 930 | */ |
| 931 | int |
| 932 | xmlUTF8Strloc(const xmlChar *utf, const xmlChar *utfchar) { |
Elliott Hughes | ecdab2a | 2022-02-23 14:33:50 -0800 | [diff] [blame] | 933 | size_t i; |
| 934 | int size; |
| 935 | int ch; |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 936 | |
| 937 | if (utf==NULL || utfchar==NULL) return -1; |
| 938 | size = xmlUTF8Strsize(utfchar, 1); |
| 939 | for(i=0; (ch=*utf) != 0; i++) { |
| 940 | if (xmlStrncmp(utf, utfchar, size)==0) |
Elliott Hughes | ecdab2a | 2022-02-23 14:33:50 -0800 | [diff] [blame] | 941 | return(i > INT_MAX ? 0 : i); |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 942 | utf++; |
| 943 | if ( ch & 0x80 ) { |
| 944 | /* if not simple ascii, verify proper format */ |
| 945 | if ( (ch & 0xc0) != 0xc0 ) |
| 946 | return(-1); |
| 947 | /* then skip over remaining bytes for this char */ |
| 948 | while ( (ch <<= 1) & 0x80 ) |
| 949 | if ( (*utf++ & 0xc0) != 0x80 ) |
| 950 | return(-1); |
| 951 | } |
| 952 | } |
| 953 | |
| 954 | return(-1); |
| 955 | } |
| 956 | /** |
| 957 | * xmlUTF8Strsub: |
| 958 | * @utf: a sequence of UTF-8 encoded bytes |
| 959 | * @start: relative pos of first char |
| 960 | * @len: total number to copy |
| 961 | * |
| 962 | * Create a substring from a given UTF-8 string |
| 963 | * Note: positions are given in units of UTF-8 chars |
| 964 | * |
| 965 | * Returns a pointer to a newly created string |
| 966 | * or NULL if any problem |
| 967 | */ |
| 968 | |
| 969 | xmlChar * |
| 970 | xmlUTF8Strsub(const xmlChar *utf, int start, int len) { |
Elliott Hughes | ecdab2a | 2022-02-23 14:33:50 -0800 | [diff] [blame] | 971 | int i; |
| 972 | int ch; |
William M. Brack | a2e844a | 2004-01-06 11:52:13 +0000 | [diff] [blame] | 973 | |
| 974 | if (utf == NULL) return(NULL); |
| 975 | if (start < 0) return(NULL); |
| 976 | if (len < 0) return(NULL); |
| 977 | |
| 978 | /* |
| 979 | * Skip over any leading chars |
| 980 | */ |
| 981 | for (i = 0;i < start;i++) { |
| 982 | if ((ch=*utf++) == 0) return(NULL); |
| 983 | if ( ch & 0x80 ) { |
| 984 | /* if not simple ascii, verify proper format */ |
| 985 | if ( (ch & 0xc0) != 0xc0 ) |
| 986 | return(NULL); |
| 987 | /* then skip over remaining bytes for this char */ |
| 988 | while ( (ch <<= 1) & 0x80 ) |
| 989 | if ( (*utf++ & 0xc0) != 0x80 ) |
| 990 | return(NULL); |
| 991 | } |
| 992 | } |
| 993 | |
| 994 | return(xmlUTF8Strndup(utf, len)); |
| 995 | } |
Daniel Veillard | 5d4644e | 2005-04-01 13:11:58 +0000 | [diff] [blame] | 996 | |
David Kilzer | 502f6a6 | 2016-05-23 14:58:41 +0800 | [diff] [blame] | 997 | /** |
| 998 | * xmlEscapeFormatString: |
| 999 | * @msg: a pointer to the string in which to escape '%' characters. |
| 1000 | * Must be a heap-allocated buffer created by libxml2 that may be |
| 1001 | * returned, or that may be freed and replaced. |
| 1002 | * |
| 1003 | * Replaces the string pointed to by 'msg' with an escaped string. |
| 1004 | * Returns the same string with all '%' characters escaped. |
| 1005 | */ |
| 1006 | xmlChar * |
| 1007 | xmlEscapeFormatString(xmlChar **msg) |
| 1008 | { |
| 1009 | xmlChar *msgPtr = NULL; |
| 1010 | xmlChar *result = NULL; |
| 1011 | xmlChar *resultPtr = NULL; |
| 1012 | size_t count = 0; |
| 1013 | size_t msgLen = 0; |
| 1014 | size_t resultLen = 0; |
| 1015 | |
| 1016 | if (!msg || !*msg) |
| 1017 | return(NULL); |
| 1018 | |
| 1019 | for (msgPtr = *msg; *msgPtr != '\0'; ++msgPtr) { |
| 1020 | ++msgLen; |
| 1021 | if (*msgPtr == '%') |
| 1022 | ++count; |
| 1023 | } |
| 1024 | |
| 1025 | if (count == 0) |
| 1026 | return(*msg); |
| 1027 | |
Elliott Hughes | ecdab2a | 2022-02-23 14:33:50 -0800 | [diff] [blame] | 1028 | if ((count > INT_MAX) || (msgLen > INT_MAX - count)) |
| 1029 | return(NULL); |
David Kilzer | 502f6a6 | 2016-05-23 14:58:41 +0800 | [diff] [blame] | 1030 | resultLen = msgLen + count + 1; |
| 1031 | result = (xmlChar *) xmlMallocAtomic(resultLen * sizeof(xmlChar)); |
| 1032 | if (result == NULL) { |
| 1033 | /* Clear *msg to prevent format string vulnerabilities in |
| 1034 | out-of-memory situations. */ |
| 1035 | xmlFree(*msg); |
| 1036 | *msg = NULL; |
| 1037 | xmlErrMemory(NULL, NULL); |
| 1038 | return(NULL); |
| 1039 | } |
| 1040 | |
| 1041 | for (msgPtr = *msg, resultPtr = result; *msgPtr != '\0'; ++msgPtr, ++resultPtr) { |
| 1042 | *resultPtr = *msgPtr; |
| 1043 | if (*msgPtr == '%') |
| 1044 | *(++resultPtr) = '%'; |
| 1045 | } |
| 1046 | result[resultLen - 1] = '\0'; |
| 1047 | |
| 1048 | xmlFree(*msg); |
| 1049 | *msg = result; |
| 1050 | |
| 1051 | return *msg; |
| 1052 | } |
| 1053 | |