Annotation of embedaddon/libiconv/srclib/streq.h, revision 1.1
1.1 ! misho 1: /* Optimized string comparison.
! 2: Copyright (C) 2001-2002, 2007 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: Lesser 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 allows to optimize string comparison with a small literal string.
! 25: STREQ (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(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(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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