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24d56127 | 1 | /* Optimized case-insensitive string comparison in C locale. |
af07e104 | 2 | Copyright (C) 2001-2002, 2007, 2009-2013 Free Software Foundation, Inc. |
24d56127 LC |
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 |