Annotation of embedaddon/curl/lib/strcase.c, revision 1.1
1.1 ! misho 1: /***************************************************************************
! 2: * _ _ ____ _
! 3: * Project ___| | | | _ \| |
! 4: * / __| | | | |_) | |
! 5: * | (__| |_| | _ <| |___
! 6: * \___|\___/|_| \_\_____|
! 7: *
! 8: * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
! 9: *
! 10: * This software is licensed as described in the file COPYING, which
! 11: * you should have received as part of this distribution. The terms
! 12: * are also available at https://curl.haxx.se/docs/copyright.html.
! 13: *
! 14: * You may opt to use, copy, modify, merge, publish, distribute and/or sell
! 15: * copies of the Software, and permit persons to whom the Software is
! 16: * furnished to do so, under the terms of the COPYING file.
! 17: *
! 18: * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
! 19: * KIND, either express or implied.
! 20: *
! 21: ***************************************************************************/
! 22:
! 23: #include "curl_setup.h"
! 24:
! 25: #include <curl/curl.h>
! 26:
! 27: #include "strcase.h"
! 28:
! 29: static char raw_tolower(char in);
! 30:
! 31: /* Portable, consistent toupper (remember EBCDIC). Do not use toupper() because
! 32: its behavior is altered by the current locale. */
! 33: char Curl_raw_toupper(char in)
! 34: {
! 35: #if !defined(CURL_DOES_CONVERSIONS)
! 36: if(in >= 'a' && in <= 'z')
! 37: return (char)('A' + in - 'a');
! 38: #else
! 39: switch(in) {
! 40: case 'a':
! 41: return 'A';
! 42: case 'b':
! 43: return 'B';
! 44: case 'c':
! 45: return 'C';
! 46: case 'd':
! 47: return 'D';
! 48: case 'e':
! 49: return 'E';
! 50: case 'f':
! 51: return 'F';
! 52: case 'g':
! 53: return 'G';
! 54: case 'h':
! 55: return 'H';
! 56: case 'i':
! 57: return 'I';
! 58: case 'j':
! 59: return 'J';
! 60: case 'k':
! 61: return 'K';
! 62: case 'l':
! 63: return 'L';
! 64: case 'm':
! 65: return 'M';
! 66: case 'n':
! 67: return 'N';
! 68: case 'o':
! 69: return 'O';
! 70: case 'p':
! 71: return 'P';
! 72: case 'q':
! 73: return 'Q';
! 74: case 'r':
! 75: return 'R';
! 76: case 's':
! 77: return 'S';
! 78: case 't':
! 79: return 'T';
! 80: case 'u':
! 81: return 'U';
! 82: case 'v':
! 83: return 'V';
! 84: case 'w':
! 85: return 'W';
! 86: case 'x':
! 87: return 'X';
! 88: case 'y':
! 89: return 'Y';
! 90: case 'z':
! 91: return 'Z';
! 92: }
! 93: #endif
! 94:
! 95: return in;
! 96: }
! 97:
! 98:
! 99: /* Portable, consistent tolower (remember EBCDIC). Do not use tolower() because
! 100: its behavior is altered by the current locale. */
! 101: static char raw_tolower(char in)
! 102: {
! 103: #if !defined(CURL_DOES_CONVERSIONS)
! 104: if(in >= 'A' && in <= 'Z')
! 105: return (char)('a' + in - 'A');
! 106: #else
! 107: switch(in) {
! 108: case 'A':
! 109: return 'a';
! 110: case 'B':
! 111: return 'b';
! 112: case 'C':
! 113: return 'c';
! 114: case 'D':
! 115: return 'd';
! 116: case 'E':
! 117: return 'e';
! 118: case 'F':
! 119: return 'f';
! 120: case 'G':
! 121: return 'g';
! 122: case 'H':
! 123: return 'h';
! 124: case 'I':
! 125: return 'i';
! 126: case 'J':
! 127: return 'j';
! 128: case 'K':
! 129: return 'k';
! 130: case 'L':
! 131: return 'l';
! 132: case 'M':
! 133: return 'm';
! 134: case 'N':
! 135: return 'n';
! 136: case 'O':
! 137: return 'o';
! 138: case 'P':
! 139: return 'p';
! 140: case 'Q':
! 141: return 'q';
! 142: case 'R':
! 143: return 'r';
! 144: case 'S':
! 145: return 's';
! 146: case 'T':
! 147: return 't';
! 148: case 'U':
! 149: return 'u';
! 150: case 'V':
! 151: return 'v';
! 152: case 'W':
! 153: return 'w';
! 154: case 'X':
! 155: return 'x';
! 156: case 'Y':
! 157: return 'y';
! 158: case 'Z':
! 159: return 'z';
! 160: }
! 161: #endif
! 162:
! 163: return in;
! 164: }
! 165:
! 166:
! 167: /*
! 168: * Curl_strcasecompare() is for doing "raw" case insensitive strings. This is
! 169: * meant to be locale independent and only compare strings we know are safe
! 170: * for this. See
! 171: * https://daniel.haxx.se/blog/2008/10/15/strcasecmp-in-turkish/ for some
! 172: * further explanation to why this function is necessary.
! 173: *
! 174: * The function is capable of comparing a-z case insensitively even for
! 175: * non-ascii.
! 176: *
! 177: * @unittest: 1301
! 178: */
! 179:
! 180: int Curl_strcasecompare(const char *first, const char *second)
! 181: {
! 182: while(*first && *second) {
! 183: if(Curl_raw_toupper(*first) != Curl_raw_toupper(*second))
! 184: /* get out of the loop as soon as they don't match */
! 185: break;
! 186: first++;
! 187: second++;
! 188: }
! 189: /* we do the comparison here (possibly again), just to make sure that if the
! 190: loop above is skipped because one of the strings reached zero, we must not
! 191: return this as a successful match */
! 192: return (Curl_raw_toupper(*first) == Curl_raw_toupper(*second));
! 193: }
! 194:
! 195: int Curl_safe_strcasecompare(const char *first, const char *second)
! 196: {
! 197: if(first && second)
! 198: /* both pointers point to something then compare them */
! 199: return Curl_strcasecompare(first, second);
! 200:
! 201: /* if both pointers are NULL then treat them as equal */
! 202: return (NULL == first && NULL == second);
! 203: }
! 204:
! 205: /*
! 206: * @unittest: 1301
! 207: */
! 208: int Curl_strncasecompare(const char *first, const char *second, size_t max)
! 209: {
! 210: while(*first && *second && max) {
! 211: if(Curl_raw_toupper(*first) != Curl_raw_toupper(*second)) {
! 212: break;
! 213: }
! 214: max--;
! 215: first++;
! 216: second++;
! 217: }
! 218: if(0 == max)
! 219: return 1; /* they are equal this far */
! 220:
! 221: return Curl_raw_toupper(*first) == Curl_raw_toupper(*second);
! 222: }
! 223:
! 224: /* Copy an upper case version of the string from src to dest. The
! 225: * strings may overlap. No more than n characters of the string are copied
! 226: * (including any NUL) and the destination string will NOT be
! 227: * NUL-terminated if that limit is reached.
! 228: */
! 229: void Curl_strntoupper(char *dest, const char *src, size_t n)
! 230: {
! 231: if(n < 1)
! 232: return;
! 233:
! 234: do {
! 235: *dest++ = Curl_raw_toupper(*src);
! 236: } while(*src++ && --n);
! 237: }
! 238:
! 239: /* Copy a lower case version of the string from src to dest. The
! 240: * strings may overlap. No more than n characters of the string are copied
! 241: * (including any NUL) and the destination string will NOT be
! 242: * NUL-terminated if that limit is reached.
! 243: */
! 244: void Curl_strntolower(char *dest, const char *src, size_t n)
! 245: {
! 246: if(n < 1)
! 247: return;
! 248:
! 249: do {
! 250: *dest++ = raw_tolower(*src);
! 251: } while(*src++ && --n);
! 252: }
! 253:
! 254: /* --- public functions --- */
! 255:
! 256: int curl_strequal(const char *first, const char *second)
! 257: {
! 258: return Curl_strcasecompare(first, second);
! 259: }
! 260: int curl_strnequal(const char *first, const char *second, size_t max)
! 261: {
! 262: return Curl_strncasecompare(first, second, max);
! 263: }
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