strcase.c (5557B)
1 /*************************************************************************** 2 * _ _ ____ _ 3 * Project ___| | | | _ \| | 4 * / __| | | | |_) | | 5 * | (__| |_| | _ <| |___ 6 * \___|\___/|_| \_\_____| 7 * 8 * Copyright (C) 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.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 * SPDX-License-Identifier: curl 22 * 23 ***************************************************************************/ 24 25 #include "curl_setup.h" 26 27 #include <curl/curl.h> 28 29 #include "strcase.h" 30 31 /* Mapping table to go from lowercase to uppercase for plain ASCII.*/ 32 static const unsigned char touppermap[256] = { 33 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 34 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 35 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 36 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 37 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 65, 38 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 39 85, 86, 87, 88, 89, 90, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 40 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 41 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 42 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 43 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 44 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 45 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 46 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 47 246, 247, 248, 249, 250, 251, 252, 253, 254, 255 48 }; 49 50 /* Mapping table to go from uppercase to lowercase for plain ASCII.*/ 51 static const unsigned char tolowermap[256] = { 52 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 53 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 54 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 55 62, 63, 64, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 56 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 91, 92, 93, 94, 95, 57 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 58 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 59 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 60 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 61 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 62 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 63 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 64 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 65 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 66 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255 67 }; 68 69 70 /* Portable, consistent toupper. Do not use toupper() because its behavior is 71 altered by the current locale. */ 72 char Curl_raw_toupper(char in) 73 { 74 return (char)touppermap[(unsigned char) in]; 75 } 76 77 78 /* Portable, consistent tolower. Do not use tolower() because its behavior is 79 altered by the current locale. */ 80 char Curl_raw_tolower(char in) 81 { 82 return (char)tolowermap[(unsigned char) in]; 83 } 84 85 /* Copy an upper case version of the string from src to dest. The 86 * strings may overlap. No more than n characters of the string are copied 87 * (including any NUL) and the destination string will NOT be 88 * null-terminated if that limit is reached. 89 */ 90 void Curl_strntoupper(char *dest, const char *src, size_t n) 91 { 92 if(n < 1) 93 return; 94 95 do { 96 *dest++ = Curl_raw_toupper(*src); 97 } while(*src++ && --n); 98 } 99 100 /* Copy a lower case version of the string from src to dest. The 101 * strings may overlap. No more than n characters of the string are copied 102 * (including any NUL) and the destination string will NOT be 103 * null-terminated if that limit is reached. 104 */ 105 void Curl_strntolower(char *dest, const char *src, size_t n) 106 { 107 if(n < 1) 108 return; 109 110 do { 111 *dest++ = Curl_raw_tolower(*src); 112 } while(*src++ && --n); 113 } 114 115 /* Compare case-sensitive null-terminated strings, taking care of possible 116 * null pointers. Return true if arguments match. 117 */ 118 bool Curl_safecmp(char *a, char *b) 119 { 120 if(a && b) 121 return !strcmp(a, b); 122 return !a && !b; 123 } 124 125 /* 126 * Curl_timestrcmp() returns 0 if the two strings are identical. The time this 127 * function spends is a function of the shortest string, not of the contents. 128 */ 129 int Curl_timestrcmp(const char *a, const char *b) 130 { 131 int match = 0; 132 int i = 0; 133 134 if(a && b) { 135 while(1) { 136 match |= a[i]^b[i]; 137 if(!a[i] || !b[i]) 138 break; 139 i++; 140 } 141 } 142 else 143 return a || b; 144 return match; 145 }