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| 1 /* Optimized string comparison. |
| 2 Copyright (C) 2001-2002, 2007, 2009-2012 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 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 General Public License for more details. |
| 13 |
| 14 You should have received a copy of the GNU 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 #ifndef _GL_STREQ_H |
| 20 #define _GL_STREQ_H |
| 21 |
| 22 #include <string.h> |
| 23 |
| 24 /* STREQ_OPT allows to optimize string comparison with a small literal string. |
| 25 STREQ_OPT (s, "EUC-KR", 'E', 'U', 'C', '-', 'K', 'R', 0, 0, 0) |
| 26 is semantically equivalent to |
| 27 strcmp (s, "EUC-KR") == 0 |
| 28 just faster. */ |
| 29 |
| 30 /* Help GCC to generate good code for string comparisons with |
| 31 immediate strings. */ |
| 32 #if defined (__GNUC__) && defined (__OPTIMIZE__) |
| 33 |
| 34 static inline int |
| 35 streq9 (const char *s1, const char *s2) |
| 36 { |
| 37 return strcmp (s1 + 9, s2 + 9) == 0; |
| 38 } |
| 39 |
| 40 static inline int |
| 41 streq8 (const char *s1, const char *s2, char s28) |
| 42 { |
| 43 if (s1[8] == s28) |
| 44 { |
| 45 if (s28 == 0) |
| 46 return 1; |
| 47 else |
| 48 return streq9 (s1, s2); |
| 49 } |
| 50 else |
| 51 return 0; |
| 52 } |
| 53 |
| 54 static inline int |
| 55 streq7 (const char *s1, const char *s2, char s27, char s28) |
| 56 { |
| 57 if (s1[7] == s27) |
| 58 { |
| 59 if (s27 == 0) |
| 60 return 1; |
| 61 else |
| 62 return streq8 (s1, s2, s28); |
| 63 } |
| 64 else |
| 65 return 0; |
| 66 } |
| 67 |
| 68 static inline int |
| 69 streq6 (const char *s1, const char *s2, char s26, char s27, char s28) |
| 70 { |
| 71 if (s1[6] == s26) |
| 72 { |
| 73 if (s26 == 0) |
| 74 return 1; |
| 75 else |
| 76 return streq7 (s1, s2, s27, s28); |
| 77 } |
| 78 else |
| 79 return 0; |
| 80 } |
| 81 |
| 82 static inline int |
| 83 streq5 (const char *s1, const char *s2, char s25, char s26, char s27, char s28) |
| 84 { |
| 85 if (s1[5] == s25) |
| 86 { |
| 87 if (s25 == 0) |
| 88 return 1; |
| 89 else |
| 90 return streq6 (s1, s2, s26, s27, s28); |
| 91 } |
| 92 else |
| 93 return 0; |
| 94 } |
| 95 |
| 96 static inline int |
| 97 streq4 (const char *s1, const char *s2, char s24, char s25, char s26, char s27,
char s28) |
| 98 { |
| 99 if (s1[4] == s24) |
| 100 { |
| 101 if (s24 == 0) |
| 102 return 1; |
| 103 else |
| 104 return streq5 (s1, s2, s25, s26, s27, s28); |
| 105 } |
| 106 else |
| 107 return 0; |
| 108 } |
| 109 |
| 110 static inline int |
| 111 streq3 (const char *s1, const char *s2, char s23, char s24, char s25, char s26,
char s27, char s28) |
| 112 { |
| 113 if (s1[3] == s23) |
| 114 { |
| 115 if (s23 == 0) |
| 116 return 1; |
| 117 else |
| 118 return streq4 (s1, s2, s24, s25, s26, s27, s28); |
| 119 } |
| 120 else |
| 121 return 0; |
| 122 } |
| 123 |
| 124 static inline int |
| 125 streq2 (const char *s1, const char *s2, char s22, char s23, char s24, char s25,
char s26, char s27, char s28) |
| 126 { |
| 127 if (s1[2] == s22) |
| 128 { |
| 129 if (s22 == 0) |
| 130 return 1; |
| 131 else |
| 132 return streq3 (s1, s2, s23, s24, s25, s26, s27, s28); |
| 133 } |
| 134 else |
| 135 return 0; |
| 136 } |
| 137 |
| 138 static inline int |
| 139 streq1 (const char *s1, const char *s2, char s21, char s22, char s23, char s24,
char s25, char s26, char s27, char s28) |
| 140 { |
| 141 if (s1[1] == s21) |
| 142 { |
| 143 if (s21 == 0) |
| 144 return 1; |
| 145 else |
| 146 return streq2 (s1, s2, s22, s23, s24, s25, s26, s27, s28); |
| 147 } |
| 148 else |
| 149 return 0; |
| 150 } |
| 151 |
| 152 static inline int |
| 153 streq0 (const char *s1, const char *s2, char s20, char s21, char s22, char s23,
char s24, char s25, char s26, char s27, char s28) |
| 154 { |
| 155 if (s1[0] == s20) |
| 156 { |
| 157 if (s20 == 0) |
| 158 return 1; |
| 159 else |
| 160 return streq1 (s1, s2, s21, s22, s23, s24, s25, s26, s27, s28); |
| 161 } |
| 162 else |
| 163 return 0; |
| 164 } |
| 165 |
| 166 #define STREQ_OPT(s1,s2,s20,s21,s22,s23,s24,s25,s26,s27,s28) \ |
| 167 streq0 (s1, s2, s20, s21, s22, s23, s24, s25, s26, s27, s28) |
| 168 |
| 169 #else |
| 170 |
| 171 #define STREQ_OPT(s1,s2,s20,s21,s22,s23,s24,s25,s26,s27,s28) \ |
| 172 (strcmp (s1, s2) == 0) |
| 173 |
| 174 #endif |
| 175 |
| 176 #endif /* _GL_STREQ_H */ |
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