File: /usr/include/ctype.h
1 /* Copyright (C) 1991,92,93,95,96,97,98,99 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
8
9 The GNU C Library 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 the GNU C Library; see the file COPYING.LIB. If not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
18
19 /*
20 * ISO C99 Standard 7.4: Character handling <ctype.h>
21 */
22
23 #ifndef _CTYPE_H
24 #define _CTYPE_H 1
25
26 #include <features.h>
27 #include <bits/types.h>
28
29 __BEGIN_DECLS
30
31 #ifndef _ISbit
32 /* These are all the characteristics of characters.
33 If there get to be more than 16 distinct characteristics,
34 many things must be changed that use `unsigned short int's.
35
36 The characteristics are stored always in network byte order (big
37 endian). We define the bit value interpretations here dependent on the
38 machine's byte order. */
39
40 # include <endian.h>
41 # if __BYTE_ORDER == __BIG_ENDIAN
42 # define _ISbit(bit) (1 << (bit))
43 # else /* __BYTE_ORDER == __LITTLE_ENDIAN */
44 # define _ISbit(bit) ((bit) < 8 ? ((1 << (bit)) << 8) : ((1 << (bit)) >> 8))
45 # endif
46
47 enum
48 {
49 _ISupper = _ISbit (0), /* UPPERCASE. */
50 _ISlower = _ISbit (1), /* lowercase. */
51 _ISalpha = _ISbit (2), /* Alphabetic. */
52 _ISdigit = _ISbit (3), /* Numeric. */
53 _ISxdigit = _ISbit (4), /* Hexadecimal numeric. */
54 _ISspace = _ISbit (5), /* Whitespace. */
55 _ISprint = _ISbit (6), /* Printing. */
56 _ISgraph = _ISbit (7), /* Graphical. */
57 _ISblank = _ISbit (8), /* Blank (usually SPC and TAB). */
58 _IScntrl = _ISbit (9), /* Control character. */
59 _ISpunct = _ISbit (10), /* Punctuation. */
60 _ISalnum = _ISbit (11) /* Alphanumeric. */
61 };
62 #endif /* ! _ISbit */
63
64 /* These are defined in ctype-info.c.
65 The declarations here must match those in localeinfo.h.
66
67 These point into arrays of 384, so they can be indexed by any `unsigned
68 char' value [0,255]; by EOF (-1); or by any `signed char' value
69 [-128,-1). ISO C requires that the ctype functions work for `unsigned
70 char' values and for EOF; we also support negative `signed char' values
71 for broken old programs. The case conversion arrays are of `int's
72 rather than `unsigned char's because tolower (EOF) must be EOF, which
73 doesn't fit into an `unsigned char'. But today more important is that
74 the arrays are also used for multi-byte character sets. */
75 extern __const unsigned short int *__ctype_b; /* Characteristics. */
76 extern __const __int32_t *__ctype_tolower; /* Case conversions. */
77 extern __const __int32_t *__ctype_toupper; /* Case conversions. */
78
79 #define __isctype(c, type) \
80 (__ctype_b[(int) (c)] & (unsigned short int) type)
81
82 #define __isascii(c) (((c) & ~0x7f) == 0) /* If C is a 7 bit value. */
83 #define __toascii(c) ((c) & 0x7f) /* Mask off high bits. */
84
85 #define __exctype(name) extern int name (int) __THROW
86
87 /* The following names are all functions:
88 int isCHARACTERISTIC(int c);
89 which return nonzero iff C has CHARACTERISTIC.
90 For the meaning of the characteristic names, see the `enum' above. */
91 __exctype (isalnum);
92 __exctype (isalpha);
93 __exctype (iscntrl);
94 __exctype (isdigit);
95 __exctype (islower);
96 __exctype (isgraph);
97 __exctype (isprint);
98 __exctype (ispunct);
99 __exctype (isspace);
100 __exctype (isupper);
101 __exctype (isxdigit);
102
103 #ifdef __USE_ISOC99
104 __exctype (isblank);
105 #endif
106
107
108 /* Return the lowercase version of C. */
109 extern int tolower (int __c) __THROW;
110
111 /* Return the uppercase version of C. */
112 extern int toupper (int __c) __THROW;
113
114
115 #if defined __USE_SVID || defined __USE_MISC || defined __USE_XOPEN
116
117 /* Return nonzero iff C is in the ASCII set
118 (i.e., is no more than 7 bits wide). */
119 extern int isascii (int __c) __THROW;
120
121 /* Return the part of C that is in the ASCII set
122 (i.e., the low-order 7 bits of C). */
123 extern int toascii (int __c) __THROW;
124
125 /* These are the same as `toupper' and `tolower' except that they do not
126 check the argument for being in the range of a `char'. */
127 __exctype (_toupper);
128 __exctype (_tolower);
129 #endif /* Use SVID or use misc. */
130
131 /* This code is needed for the optimized mapping functions. */
132 #define __tobody(c, f, a, args) \
133 (__extension__ \
134 ({ int __res; \
135 if (sizeof (c) > 1) \
136 { \
137 if (__builtin_constant_p (c)) \
138 { \
139 int __c = (c); \
140 __res = __c < -128 || __c > 255 ? __c : a[__c]; \
141 } \
142 else \
143 __res = f args; \
144 } \
145 else \
146 __res = a[(int) (c)]; \
147 __res; }))
148
149 #ifndef __NO_CTYPE
150 # define isalnum(c) __isctype((c), _ISalnum)
151 # define isalpha(c) __isctype((c), _ISalpha)
152 # define iscntrl(c) __isctype((c), _IScntrl)
153 # define isdigit(c) __isctype((c), _ISdigit)
154 # define islower(c) __isctype((c), _ISlower)
155 # define isgraph(c) __isctype((c), _ISgraph)
156 # define isprint(c) __isctype((c), _ISprint)
157 # define ispunct(c) __isctype((c), _ISpunct)
158 # define isspace(c) __isctype((c), _ISspace)
159 # define isupper(c) __isctype((c), _ISupper)
160 # define isxdigit(c) __isctype((c), _ISxdigit)
161
162 # ifdef __USE_ISOC99
163 # define isblank(c) __isctype((c), _ISblank)
164 # endif
165
166 # if defined __OPTIMIZE__ && !defined __OPTIMIZE_SIZE__ \
167 && defined __USE_EXTERN_INLINES
168 extern __inline int
169 tolower (int __c) __THROW
170 {
171 return __c >= -128 && __c < 256 ? __ctype_tolower[__c] : __c;
172 }
173
174 extern __inline int
175 toupper (int __c) __THROW
176 {
177 return __c >= -128 && __c < 256 ? __ctype_toupper[__c] : __c;
178 }
179 # endif
180
181 # if __GNUC__ >= 2 && defined __OPTIMIZE__ && !defined __cplusplus
182 # define tolower(c) __tobody (c, tolower, __ctype_tolower, (c))
183 # define toupper(c) __tobody (c, toupper, __ctype_toupper, (c))
184 # endif /* Optimizing gcc */
185
186 # if defined __USE_SVID || defined __USE_MISC || defined __USE_XOPEN
187 # define isascii(c) __isascii (c)
188 # define toascii(c) __toascii (c)
189
190 # define _tolower(c) ((int) __ctype_tolower[(int) (c)])
191 # define _toupper(c) ((int) __ctype_toupper[(int) (c)])
192 # endif
193
194 #endif /* Not __NO_CTYPE. */
195
196
197 #ifdef __USE_GNU
198 /* The concept of one static locale per category is not very well
199 thought out. Many applications will need to process its data using
200 information from several different locales. Another application is
201 the implementation of the internationalization handling in the
202 upcoming ISO C++ standard library. To support this another set of
203 the functions using locale data exist which have an additional
204 argument.
205
206 Attention: all these functions are *not* standardized in any form.
207 This is a proof-of-concept implementation. */
208
209 /* Structure for reentrant locale using functions. This is an
210 (almost) opaque type for the user level programs. */
211 # include <xlocale.h>
212
213 /* These definitions are similar to the ones above but all functions
214 take as an argument a handle for the locale which shall be used. */
215 # define __isctype_l(c, type, locale) \
216 ((locale)->__ctype_b[(int) (c)] & (unsigned short int) type)
217
218 # define __exctype_l(name) extern int name (int, __locale_t) __THROW
219
220 /* The following names are all functions:
221 int isCHARACTERISTIC(int c, locale_t *locale);
222 which return nonzero iff C has CHARACTERISTIC.
223 For the meaning of the characteristic names, see the `enum' above. */
224 __exctype_l (__isalnum_l);
225 __exctype_l (__isalpha_l);
226 __exctype_l (__iscntrl_l);
227 __exctype_l (__isdigit_l);
228 __exctype_l (__islower_l);
229 __exctype_l (__isgraph_l);
230 __exctype_l (__isprint_l);
231 __exctype_l (__ispunct_l);
232 __exctype_l (__isspace_l);
233 __exctype_l (__isupper_l);
234 __exctype_l (__isxdigit_l);
235
236 __exctype_l (__isblank_l);
237
238
239 /* Return the lowercase version of C in locale L. */
240 extern int __tolower_l (int __c, __locale_t __l) __THROW;
241
242 /* Return the uppercase version of C. */
243 extern int __toupper_l (int __c, __locale_t __l) __THROW;
244
245 # if __GNUC__ >= 2 && defined __OPTIMIZE__ && !defined __cplusplus
246 # define __tolower_l(c, locale) \
247 __tobody (c, __tolower_l, (locale)->__ctype_tolower, (c, locale))
248 # define __toupper_l(c, locale) \
249 __tobody (c, __toupper_l, (locale)->__ctype_toupper, (c, locale))
250 # endif /* Optimizing gcc */
251
252
253 # ifndef __NO_CTYPE
254 # define __isalnum_l(c,l) __isctype_l((c), _ISalnum, (l))
255 # define __isalpha_l(c,l) __isctype_l((c), _ISalpha, (l))
256 # define __iscntrl_l(c,l) __isctype_l((c), _IScntrl, (l))
257 # define __isdigit_l(c,l) __isctype_l((c), _ISdigit, (l))
258 # define __islower_l(c,l) __isctype_l((c), _ISlower, (l))
259 # define __isgraph_l(c,l) __isctype_l((c), _ISgraph, (l))
260 # define __isprint_l(c,l) __isctype_l((c), _ISprint, (l))
261 # define __ispunct_l(c,l) __isctype_l((c), _ISpunct, (l))
262 # define __isspace_l(c,l) __isctype_l((c), _ISspace, (l))
263 # define __isupper_l(c,l) __isctype_l((c), _ISupper, (l))
264 # define __isxdigit_l(c,l) __isctype_l((c), _ISxdigit, (l))
265
266 # define __isblank_l(c,l) __isctype_l((c), _ISblank, (l))
267
268 # if defined __USE_SVID || defined __USE_MISC || defined __USE_XOPEN
269 # define __isascii_l(c,l) __isascii(c)
270 # define __toascii_l(c,l) __toascii(c)
271 # endif
272
273 # endif /* Not __NO_CTYPE. */
274
275 #endif /* Use GNU. */
276
277 __END_DECLS
278
279 #endif /* ctype.h */
280