1/* Character handling in C locale.
2
3 These functions work like the corresponding functions in <ctype.h>,
4 except that they have the C (POSIX) locale hardwired, whereas the
5 <ctype.h> functions' behaviour depends on the current locale set via
6 setlocale.
7
8 Copyright (C) 2000-2003, 2006, 2008-2012 Free Software Foundation, Inc.
9
10This program is free software; you can redistribute it and/or modify
11it under the terms of the GNU Lesser General Public License as published by
12the Free Software Foundation; either version 2.1 of the License, or
13(at your option) any later version.
14
15This program is distributed in the hope that it will be useful,
16but WITHOUT ANY WARRANTY; without even the implied warranty of
17MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18GNU Lesser General Public License for more details.
19
20You should have received a copy of the GNU Lesser General Public License
21along with this program; if not, see <http://www.gnu.org/licenses/>. */
22
23#ifndef C_CTYPE_H
24#define C_CTYPE_H
25
26#include <stdbool.h>
27#include "config.h"
28
29
30#ifdef __cplusplus
31extern "C" {
32#endif
33
34
35/* The functions defined in this file assume the "C" locale and a character
36 set without diacritics (ASCII-US or EBCDIC-US or something like that).
37 Even if the "C" locale on a particular system is an extension of the ASCII
38 character set (like on BeOS, where it is UTF-8, or on AmigaOS, where it
39 is ISO-8859-1), the functions in this file recognize only the ASCII
40 characters. */
41
42
43/* Check whether the ASCII optimizations apply. */
44
45/* ANSI C89 (and ISO C99 5.2.1.3 too) already guarantees that
46 '0', '1', ..., '9' have consecutive integer values. */
47#define C_CTYPE_CONSECUTIVE_DIGITS 1
48
49#if ('A' <= 'Z') \
50 && ('A' + 1 == 'B') && ('B' + 1 == 'C') && ('C' + 1 == 'D') \
51 && ('D' + 1 == 'E') && ('E' + 1 == 'F') && ('F' + 1 == 'G') \
52 && ('G' + 1 == 'H') && ('H' + 1 == 'I') && ('I' + 1 == 'J') \
53 && ('J' + 1 == 'K') && ('K' + 1 == 'L') && ('L' + 1 == 'M') \
54 && ('M' + 1 == 'N') && ('N' + 1 == 'O') && ('O' + 1 == 'P') \
55 && ('P' + 1 == 'Q') && ('Q' + 1 == 'R') && ('R' + 1 == 'S') \
56 && ('S' + 1 == 'T') && ('T' + 1 == 'U') && ('U' + 1 == 'V') \
57 && ('V' + 1 == 'W') && ('W' + 1 == 'X') && ('X' + 1 == 'Y') \
58 && ('Y' + 1 == 'Z')
59#define C_CTYPE_CONSECUTIVE_UPPERCASE 1
60#endif
61
62#if ('a' <= 'z') \
63 && ('a' + 1 == 'b') && ('b' + 1 == 'c') && ('c' + 1 == 'd') \
64 && ('d' + 1 == 'e') && ('e' + 1 == 'f') && ('f' + 1 == 'g') \
65 && ('g' + 1 == 'h') && ('h' + 1 == 'i') && ('i' + 1 == 'j') \
66 && ('j' + 1 == 'k') && ('k' + 1 == 'l') && ('l' + 1 == 'm') \
67 && ('m' + 1 == 'n') && ('n' + 1 == 'o') && ('o' + 1 == 'p') \
68 && ('p' + 1 == 'q') && ('q' + 1 == 'r') && ('r' + 1 == 's') \
69 && ('s' + 1 == 't') && ('t' + 1 == 'u') && ('u' + 1 == 'v') \
70 && ('v' + 1 == 'w') && ('w' + 1 == 'x') && ('x' + 1 == 'y') \
71 && ('y' + 1 == 'z')
72#define C_CTYPE_CONSECUTIVE_LOWERCASE 1
73#endif
74
75#if (' ' == 32) && ('!' == 33) && ('"' == 34) && ('#' == 35) \
76 && ('%' == 37) && ('&' == 38) && ('\'' == 39) && ('(' == 40) \
77 && (')' == 41) && ('*' == 42) && ('+' == 43) && (',' == 44) \
78 && ('-' == 45) && ('.' == 46) && ('/' == 47) && ('0' == 48) \
79 && ('1' == 49) && ('2' == 50) && ('3' == 51) && ('4' == 52) \
80 && ('5' == 53) && ('6' == 54) && ('7' == 55) && ('8' == 56) \
81 && ('9' == 57) && (':' == 58) && (';' == 59) && ('<' == 60) \
82 && ('=' == 61) && ('>' == 62) && ('?' == 63) && ('A' == 65) \
83 && ('B' == 66) && ('C' == 67) && ('D' == 68) && ('E' == 69) \
84 && ('F' == 70) && ('G' == 71) && ('H' == 72) && ('I' == 73) \
85 && ('J' == 74) && ('K' == 75) && ('L' == 76) && ('M' == 77) \
86 && ('N' == 78) && ('O' == 79) && ('P' == 80) && ('Q' == 81) \
87 && ('R' == 82) && ('S' == 83) && ('T' == 84) && ('U' == 85) \
88 && ('V' == 86) && ('W' == 87) && ('X' == 88) && ('Y' == 89) \
89 && ('Z' == 90) && ('[' == 91) && ('\\' == 92) && (']' == 93) \
90 && ('^' == 94) && ('_' == 95) && ('a' == 97) && ('b' == 98) \
91 && ('c' == 99) && ('d' == 100) && ('e' == 101) && ('f' == 102) \
92 && ('g' == 103) && ('h' == 104) && ('i' == 105) && ('j' == 106) \
93 && ('k' == 107) && ('l' == 108) && ('m' == 109) && ('n' == 110) \
94 && ('o' == 111) && ('p' == 112) && ('q' == 113) && ('r' == 114) \
95 && ('s' == 115) && ('t' == 116) && ('u' == 117) && ('v' == 118) \
96 && ('w' == 119) && ('x' == 120) && ('y' == 121) && ('z' == 122) \
97 && ('{' == 123) && ('|' == 124) && ('}' == 125) && ('~' == 126)
98/* The character set is ASCII or one of its variants or extensions, not EBCDIC.
99 Testing the value of '\n' and '\r' is not relevant. */
100#define C_CTYPE_ASCII 1
101#endif
102
103
104/* Function declarations. */
105
106/* Unlike the functions in <ctype.h>, which require an argument in the range
107 of the 'unsigned char' type, the functions here operate on values that are
108 in the 'unsigned char' range or in the 'char' range. In other words,
109 when you have a 'char' value, you need to cast it before using it as
110 argument to a <ctype.h> function:
111
112 const char *s = ...;
113 if (isalpha ((unsigned char) *s)) ...
114
115 but you don't need to cast it for the functions defined in this file:
116
117 const char *s = ...;
118 if (c_isalpha (*s)) ...
119 */
120
121extern bool c_isascii (int c) _GL_ATTRIBUTE_CONST; /* not locale dependent */
122
123extern bool c_isalnum (int c) _GL_ATTRIBUTE_CONST;
124extern bool c_isalpha (int c) _GL_ATTRIBUTE_CONST;
125extern bool c_isblank (int c) _GL_ATTRIBUTE_CONST;
126extern bool c_iscntrl (int c) _GL_ATTRIBUTE_CONST;
127extern bool c_isdigit (int c) _GL_ATTRIBUTE_CONST;
128extern bool c_islower (int c) _GL_ATTRIBUTE_CONST;
129extern bool c_isgraph (int c) _GL_ATTRIBUTE_CONST;
130extern bool c_isprint (int c) _GL_ATTRIBUTE_CONST;
131extern bool c_ispunct (int c) _GL_ATTRIBUTE_CONST;
132extern bool c_isspace (int c) _GL_ATTRIBUTE_CONST;
133extern bool c_isupper (int c) _GL_ATTRIBUTE_CONST;
134extern bool c_isxdigit (int c) _GL_ATTRIBUTE_CONST;
135
136extern int c_tolower (int c) _GL_ATTRIBUTE_CONST;
137extern int c_toupper (int c) _GL_ATTRIBUTE_CONST;
138
139
140#if defined __GNUC__ && defined __OPTIMIZE__ && !defined __OPTIMIZE_SIZE__ && !defined NO_C_CTYPE_MACROS
141
142/* ASCII optimizations. */
143
144#undef c_isascii
145#define c_isascii(c) \
146 ({ int __c = (c); \
147 (__c >= 0x00 && __c <= 0x7f); \
148 })
149
150#if C_CTYPE_CONSECUTIVE_DIGITS \
151 && C_CTYPE_CONSECUTIVE_UPPERCASE && C_CTYPE_CONSECUTIVE_LOWERCASE
152#if C_CTYPE_ASCII
153#undef c_isalnum
154#define c_isalnum(c) \
155 ({ int __c = (c); \
156 ((__c >= '0' && __c <= '9') \
157 || ((__c & ~0x20) >= 'A' && (__c & ~0x20) <= 'Z')); \
158 })
159#else
160#undef c_isalnum
161#define c_isalnum(c) \
162 ({ int __c = (c); \
163 ((__c >= '0' && __c <= '9') \
164 || (__c >= 'A' && __c <= 'Z') \
165 || (__c >= 'a' && __c <= 'z')); \
166 })
167#endif
168#endif
169
170#if C_CTYPE_CONSECUTIVE_UPPERCASE && C_CTYPE_CONSECUTIVE_LOWERCASE
171#if C_CTYPE_ASCII
172#undef c_isalpha
173#define c_isalpha(c) \
174 ({ int __c = (c); \
175 ((__c & ~0x20) >= 'A' && (__c & ~0x20) <= 'Z'); \
176 })
177#else
178#undef c_isalpha
179#define c_isalpha(c) \
180 ({ int __c = (c); \
181 ((__c >= 'A' && __c <= 'Z') || (__c >= 'a' && __c <= 'z')); \
182 })
183#endif
184#endif
185
186#undef c_isblank
187#define c_isblank(c) \
188 ({ int __c = (c); \
189 (__c == ' ' || __c == '\t'); \
190 })
191
192#if C_CTYPE_ASCII
193#undef c_iscntrl
194#define c_iscntrl(c) \
195 ({ int __c = (c); \
196 ((__c & ~0x1f) == 0 || __c == 0x7f); \
197 })
198#endif
199
200#if C_CTYPE_CONSECUTIVE_DIGITS
201#undef c_isdigit
202#define c_isdigit(c) \
203 ({ int __c = (c); \
204 (__c >= '0' && __c <= '9'); \
205 })
206#endif
207
208#if C_CTYPE_CONSECUTIVE_LOWERCASE
209#undef c_islower
210#define c_islower(c) \
211 ({ int __c = (c); \
212 (__c >= 'a' && __c <= 'z'); \
213 })
214#endif
215
216#if C_CTYPE_ASCII
217#undef c_isgraph
218#define c_isgraph(c) \
219 ({ int __c = (c); \
220 (__c >= '!' && __c <= '~'); \
221 })
222#endif
223
224#if C_CTYPE_ASCII
225#undef c_isprint
226#define c_isprint(c) \
227 ({ int __c = (c); \
228 (__c >= ' ' && __c <= '~'); \
229 })
230#endif
231
232#if C_CTYPE_ASCII
233#undef c_ispunct
234#define c_ispunct(c) \
235 ({ int _c = (c); \
236 (c_isgraph (_c) && ! c_isalnum (_c)); \
237 })
238#endif
239
240#undef c_isspace
241#define c_isspace(c) \
242 ({ int __c = (c); \
243 (__c == ' ' || __c == '\t' \
244 || __c == '\n' || __c == '\v' || __c == '\f' || __c == '\r'); \
245 })
246
247#if C_CTYPE_CONSECUTIVE_UPPERCASE
248#undef c_isupper
249#define c_isupper(c) \
250 ({ int __c = (c); \
251 (__c >= 'A' && __c <= 'Z'); \
252 })
253#endif
254
255#if C_CTYPE_CONSECUTIVE_DIGITS \
256 && C_CTYPE_CONSECUTIVE_UPPERCASE && C_CTYPE_CONSECUTIVE_LOWERCASE
257#if C_CTYPE_ASCII
258#undef c_isxdigit
259#define c_isxdigit(c) \
260 ({ int __c = (c); \
261 ((__c >= '0' && __c <= '9') \
262 || ((__c & ~0x20) >= 'A' && (__c & ~0x20) <= 'F')); \
263 })
264#else
265#undef c_isxdigit
266#define c_isxdigit(c) \
267 ({ int __c = (c); \
268 ((__c >= '0' && __c <= '9') \
269 || (__c >= 'A' && __c <= 'F') \
270 || (__c >= 'a' && __c <= 'f')); \
271 })
272#endif
273#endif
274
275#if C_CTYPE_CONSECUTIVE_UPPERCASE && C_CTYPE_CONSECUTIVE_LOWERCASE
276#undef c_tolower
277#define c_tolower(c) \
278 ({ int __c = (c); \
279 (__c >= 'A' && __c <= 'Z' ? __c - 'A' + 'a' : __c); \
280 })
281#undef c_toupper
282#define c_toupper(c) \
283 ({ int __c = (c); \
284 (__c >= 'a' && __c <= 'z' ? __c - 'a' + 'A' : __c); \
285 })
286#endif
287
288#endif /* optimizing for speed */
289
290
291#ifdef __cplusplus
292}
293#endif
294
295#endif /* C_CTYPE_H */
296