| 1 | /* Optimized case-insensitive string comparison in C locale. |
| 2 | Copyright (C) 2001-2002, 2007, 2009-2014 Free Software Foundation, Inc. |
| 3 | |
| 4 | This program is free software: you can redistribute it and/or modify it |
| 5 | under the terms of the GNU Lesser General Public License as published |
| 6 | by the Free Software Foundation; either version 3 of the License, or |
| 7 | (at your option) any later version. |
| 8 | |
| 9 | This program is distributed in the hope that it will be useful, |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | Lesser General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU Lesser General Public License |
| 15 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 16 | |
| 17 | /* Written by Bruno Haible <bruno@clisp.org>. */ |
| 18 | |
| 19 | #include "c-strcase.h" |
| 20 | #include "c-ctype.h" |
| 21 | |
| 22 | /* STRCASEEQ allows to optimize string comparison with a small literal string. |
| 23 | STRCASEEQ (s, "UTF-8", 'U','T','F','-','8',0,0,0,0) |
| 24 | is semantically equivalent to |
| 25 | c_strcasecmp (s, "UTF-8") == 0 |
| 26 | just faster. */ |
| 27 | |
| 28 | /* Help GCC to generate good code for string comparisons with |
| 29 | immediate strings. */ |
| 30 | #if defined (__GNUC__) && defined (__OPTIMIZE__) |
| 31 | |
| 32 | /* Case insensitive comparison of ASCII characters. */ |
| 33 | # if C_CTYPE_ASCII |
| 34 | # define CASEEQ(other,upper) \ |
| 35 | (c_isupper (upper) ? ((other) & ~0x20) == (upper) : (other) == (upper)) |
| 36 | # elif C_CTYPE_CONSECUTIVE_UPPERCASE && C_CTYPE_CONSECUTIVE_LOWERCASE |
| 37 | # define CASEEQ(other,upper) \ |
| 38 | (c_isupper (upper) ? (other) == (upper) || (other) == (upper) - 'A' + 'a' : (other) == (upper)) |
| 39 | # else |
| 40 | # define CASEEQ(other,upper) \ |
| 41 | (c_toupper (other) == (upper)) |
| 42 | # endif |
| 43 | |
| 44 | static inline int |
| 45 | strcaseeq9 (const char *s1, const char *s2) |
| 46 | { |
| 47 | return c_strcasecmp (s1 + 9, s2 + 9) == 0; |
| 48 | } |
| 49 | |
| 50 | static inline int |
| 51 | strcaseeq8 (const char *s1, const char *s2, char s28) |
| 52 | { |
| 53 | if (CASEEQ (s1[8], s28)) |
| 54 | { |
| 55 | if (s28 == 0) |
| 56 | return 1; |
| 57 | else |
| 58 | return strcaseeq9 (s1, s2); |
| 59 | } |
| 60 | else |
| 61 | return 0; |
| 62 | } |
| 63 | |
| 64 | static inline int |
| 65 | strcaseeq7 (const char *s1, const char *s2, char s27, char s28) |
| 66 | { |
| 67 | if (CASEEQ (s1[7], s27)) |
| 68 | { |
| 69 | if (s27 == 0) |
| 70 | return 1; |
| 71 | else |
| 72 | return strcaseeq8 (s1, s2, s28); |
| 73 | } |
| 74 | else |
| 75 | return 0; |
| 76 | } |
| 77 | |
| 78 | static inline int |
| 79 | strcaseeq6 (const char *s1, const char *s2, char s26, char s27, char s28) |
| 80 | { |
| 81 | if (CASEEQ (s1[6], s26)) |
| 82 | { |
| 83 | if (s26 == 0) |
| 84 | return 1; |
| 85 | else |
| 86 | return strcaseeq7 (s1, s2, s27, s28); |
| 87 | } |
| 88 | else |
| 89 | return 0; |
| 90 | } |
| 91 | |
| 92 | static inline int |
| 93 | strcaseeq5 (const char *s1, const char *s2, char s25, char s26, char s27, char s28) |
| 94 | { |
| 95 | if (CASEEQ (s1[5], s25)) |
| 96 | { |
| 97 | if (s25 == 0) |
| 98 | return 1; |
| 99 | else |
| 100 | return strcaseeq6 (s1, s2, s26, s27, s28); |
| 101 | } |
| 102 | else |
| 103 | return 0; |
| 104 | } |
| 105 | |
| 106 | static inline int |
| 107 | strcaseeq4 (const char *s1, const char *s2, char s24, char s25, char s26, char s27, char s28) |
| 108 | { |
| 109 | if (CASEEQ (s1[4], s24)) |
| 110 | { |
| 111 | if (s24 == 0) |
| 112 | return 1; |
| 113 | else |
| 114 | return strcaseeq5 (s1, s2, s25, s26, s27, s28); |
| 115 | } |
| 116 | else |
| 117 | return 0; |
| 118 | } |
| 119 | |
| 120 | static inline int |
| 121 | strcaseeq3 (const char *s1, const char *s2, char s23, char s24, char s25, char s26, char s27, char s28) |
| 122 | { |
| 123 | if (CASEEQ (s1[3], s23)) |
| 124 | { |
| 125 | if (s23 == 0) |
| 126 | return 1; |
| 127 | else |
| 128 | return strcaseeq4 (s1, s2, s24, s25, s26, s27, s28); |
| 129 | } |
| 130 | else |
| 131 | return 0; |
| 132 | } |
| 133 | |
| 134 | static inline int |
| 135 | strcaseeq2 (const char *s1, const char *s2, char s22, char s23, char s24, char s25, char s26, char s27, char s28) |
| 136 | { |
| 137 | if (CASEEQ (s1[2], s22)) |
| 138 | { |
| 139 | if (s22 == 0) |
| 140 | return 1; |
| 141 | else |
| 142 | return strcaseeq3 (s1, s2, s23, s24, s25, s26, s27, s28); |
| 143 | } |
| 144 | else |
| 145 | return 0; |
| 146 | } |
| 147 | |
| 148 | static inline int |
| 149 | strcaseeq1 (const char *s1, const char *s2, char s21, char s22, char s23, char s24, char s25, char s26, char s27, char s28) |
| 150 | { |
| 151 | if (CASEEQ (s1[1], s21)) |
| 152 | { |
| 153 | if (s21 == 0) |
| 154 | return 1; |
| 155 | else |
| 156 | return strcaseeq2 (s1, s2, s22, s23, s24, s25, s26, s27, s28); |
| 157 | } |
| 158 | else |
| 159 | return 0; |
| 160 | } |
| 161 | |
| 162 | static inline int |
| 163 | strcaseeq0 (const char *s1, const char *s2, char s20, char s21, char s22, char s23, char s24, char s25, char s26, char s27, char s28) |
| 164 | { |
| 165 | if (CASEEQ (s1[0], s20)) |
| 166 | { |
| 167 | if (s20 == 0) |
| 168 | return 1; |
| 169 | else |
| 170 | return strcaseeq1 (s1, s2, s21, s22, s23, s24, s25, s26, s27, s28); |
| 171 | } |
| 172 | else |
| 173 | return 0; |
| 174 | } |
| 175 | |
| 176 | #define STRCASEEQ(s1,s2,s20,s21,s22,s23,s24,s25,s26,s27,s28) \ |
| 177 | strcaseeq0 (s1, s2, s20, s21, s22, s23, s24, s25, s26, s27, s28) |
| 178 | |
| 179 | #else |
| 180 | |
| 181 | #define STRCASEEQ(s1,s2,s20,s21,s22,s23,s24,s25,s26,s27,s28) \ |
| 182 | (c_strcasecmp (s1, s2) == 0) |
| 183 | |
| 184 | #endif |