/src/curl/lib/strcase.c

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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	14.8k	{
74	14.8k	return (char)touppermap[(unsigned char) in];
75	14.8k	}
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	1.36k	{
82	1.36k	return (char)tolowermap[(unsigned char) in];
83	1.36k	}
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	0	{
92	0	if(n < 1)
93	0	return;
94
95	0	do {
96	0	dest++ = Curl_raw_toupper(src);
97	0	} while(*src++ && --n);
98	0	}
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	250	{
107	250	if(n < 1)
108	0	return;
109
110	1.04k	do {
111	1.04k	dest++ = Curl_raw_tolower(src);
112	1.04k	} while(*src++ && --n);
113	250	}
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	0	{
120	0	if(a && b)
121	0	return !strcmp(a, b);
122	0	return !a && !b;
123	0	}
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	0	{
131	0	int match = 0;
132	0	int i = 0;
133
134	0	if(a && b) {
135	0	while(1) {
136	0	match \|= a[i]^b[i];
137	0	if(!a[i] \|\| !b[i])
138	0	break;
139	0	i++;
140	0	}
141	0	}
142	0	else
143	0	return a \|\| b;
144	0	return match;
145	0	}

Coverage Report

Created: 2025-07-11 06:57