/* Optimized string comparison. Copyright (C) 2001-2002, 2007, 2009-2019 Free Software Foundation, Inc. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>. */ /* Written by Bruno Haible <bruno@clisp.org>. */ #ifndef _GL_STREQ_H #define _GL_STREQ_H #include <string.h> /* STREQ_OPT allows to optimize string comparison with a small literal string. STREQ_OPT (s, "EUC-KR", 'E', 'U', 'C', '-', 'K', 'R', 0, 0, 0) is semantically equivalent to strcmp (s, "EUC-KR") == 0 just faster. */ /* Help GCC to generate good code for string comparisons with immediate strings. */ #if defined (__GNUC__) && defined (__OPTIMIZE__) static inline int streq9 (const char *s1, const char *s2) { return strcmp (s1 + 9, s2 + 9) == 0; } static inline int streq8 (const char *s1, const char *s2, char s28) { if (s1[8] == s28) { if (s28 == 0) return 1; else return streq9 (s1, s2); } else return 0; } static inline int streq7 (const char *s1, const char *s2, char s27, char s28) { if (s1[7] == s27) { if (s27 == 0) return 1; else return streq8 (s1, s2, s28); } else return 0; } static inline int streq6 (const char *s1, const char *s2, char s26, char s27, char s28) { if (s1[6] == s26) { if (s26 == 0) return 1; else return streq7 (s1, s2, s27, s28); } else return 0; } static inline int streq5 (const char *s1, const char *s2, char s25, char s26, char s27, char s28) { if (s1[5] == s25) { if (s25 == 0) return 1; else return streq6 (s1, s2, s26, s27, s28); } else return 0; } static inline int streq4 (const char *s1, const char *s2, char s24, char s25, char s26, char s27, char s28) { if (s1[4] == s24) { if (s24 == 0) return 1; else return streq5 (s1, s2, s25, s26, s27, s28); } else return 0; } static inline int streq3 (const char *s1, const char *s2, char s23, char s24, char s25, char s26, char s27, char s28) { if (s1[3] == s23) { if (s23 == 0) return 1; else return streq4 (s1, s2, s24, s25, s26, s27, s28); } else return 0; } static inline int streq2 (const char *s1, const char *s2, char s22, char s23, char s24, char s25, char s26, char s27, char s28) { if (s1[2] == s22) { if (s22 == 0) return 1; else return streq3 (s1, s2, s23, s24, s25, s26, s27, s28); } else return 0; } static inline int streq1 (const char *s1, const char *s2, char s21, char s22, char s23, char s24, char s25, char s26, char s27, char s28) { if (s1[1] == s21) { if (s21 == 0) return 1; else return streq2 (s1, s2, s22, s23, s24, s25, s26, s27, s28); } else return 0; } static inline int 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) { if (s1[0] == s20) { if (s20 == 0) return 1; else return streq1 (s1, s2, s21, s22, s23, s24, s25, s26, s27, s28); } else return 0; } #define STREQ_OPT(s1,s2,s20,s21,s22,s23,s24,s25,s26,s27,s28) \ streq0 (s1, s2, s20, s21, s22, s23, s24, s25, s26, s27, s28) #else #define STREQ_OPT(s1,s2,s20,s21,s22,s23,s24,s25,s26,s27,s28) \ (strcmp (s1, s2) == 0) #endif #endif /* _GL_STREQ_H */