1/* Optimized string comparison. 2 Copyright (C) 2001-2002 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 Library General Public License as published 6 by the Free Software Foundation; either version 2, or (at your option) 7 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 Library General Public License for more details. 13 14 You should have received a copy of the GNU Library General Public 15 License along with this program; if not, write to the Free Software 16 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 17 USA. */ 18 19/* Written by Bruno Haible <bruno@clisp.org>. */ 20 21#include <string.h> 22 23/* Help GCC to generate good code for string comparisons with 24 immediate strings. */ 25#if defined (__GNUC__) && defined (__OPTIMIZE__) 26 27static inline int 28streq9 (const char *s1, const char *s2) 29{ 30 return strcmp (s1 + 9, s2 + 9) == 0; 31} 32 33static inline int 34streq8 (const char *s1, const char *s2, char s28) 35{ 36 if (s1[8] == s28) 37 { 38 if (s28 == 0) 39 return 1; 40 else 41 return streq9 (s1, s2); 42 } 43 else 44 return 0; 45} 46 47static inline int 48streq7 (const char *s1, const char *s2, char s27, char s28) 49{ 50 if (s1[7] == s27) 51 { 52 if (s27 == 0) 53 return 1; 54 else 55 return streq8 (s1, s2, s28); 56 } 57 else 58 return 0; 59} 60 61static inline int 62streq6 (const char *s1, const char *s2, char s26, char s27, char s28) 63{ 64 if (s1[6] == s26) 65 { 66 if (s26 == 0) 67 return 1; 68 else 69 return streq7 (s1, s2, s27, s28); 70 } 71 else 72 return 0; 73} 74 75static inline int 76streq5 (const char *s1, const char *s2, char s25, char s26, char s27, char s28) 77{ 78 if (s1[5] == s25) 79 { 80 if (s25 == 0) 81 return 1; 82 else 83 return streq6 (s1, s2, s26, s27, s28); 84 } 85 else 86 return 0; 87} 88 89static inline int 90streq4 (const char *s1, const char *s2, char s24, char s25, char s26, char s27, char s28) 91{ 92 if (s1[4] == s24) 93 { 94 if (s24 == 0) 95 return 1; 96 else 97 return streq5 (s1, s2, s25, s26, s27, s28); 98 } 99 else 100 return 0; 101} 102 103static inline int 104streq3 (const char *s1, const char *s2, char s23, char s24, char s25, char s26, char s27, char s28) 105{ 106 if (s1[3] == s23) 107 { 108 if (s23 == 0) 109 return 1; 110 else 111 return streq4 (s1, s2, s24, s25, s26, s27, s28); 112 } 113 else 114 return 0; 115} 116 117static inline int 118streq2 (const char *s1, const char *s2, char s22, char s23, char s24, char s25, char s26, char s27, char s28) 119{ 120 if (s1[2] == s22) 121 { 122 if (s22 == 0) 123 return 1; 124 else 125 return streq3 (s1, s2, s23, s24, s25, s26, s27, s28); 126 } 127 else 128 return 0; 129} 130 131static inline int 132streq1 (const char *s1, const char *s2, char s21, char s22, char s23, char s24, char s25, char s26, char s27, char s28) 133{ 134 if (s1[1] == s21) 135 { 136 if (s21 == 0) 137 return 1; 138 else 139 return streq2 (s1, s2, s22, s23, s24, s25, s26, s27, s28); 140 } 141 else 142 return 0; 143} 144 145static inline int 146streq0 (const char *s1, const char *s2, char s20, char s21, char s22, char s23, char s24, char s25, char s26, char s27, char s28) 147{ 148 if (s1[0] == s20) 149 { 150 if (s20 == 0) 151 return 1; 152 else 153 return streq1 (s1, s2, s21, s22, s23, s24, s25, s26, s27, s28); 154 } 155 else 156 return 0; 157} 158 159#define STREQ(s1,s2,s20,s21,s22,s23,s24,s25,s26,s27,s28) \ 160 streq0 (s1, s2, s20, s21, s22, s23, s24, s25, s26, s27, s28) 161 162#else 163 164#define STREQ(s1,s2,s20,s21,s22,s23,s24,s25,s26,s27,s28) \ 165 (strcmp (s1, s2) == 0) 166 167#endif 168