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, 2008-2019 Free Software Foundation, Inc.
9:
10: This program is free software; you can redistribute it and/or modify
11: it under the terms of the GNU General Public License as published by
12: the Free Software Foundation; either version 3 of the License, or
13: (at your option) any later version.
14:
15: This program is distributed in the hope that it will be useful,
16: but WITHOUT ANY WARRANTY; without even the implied warranty of
17: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: GNU General Public License for more details.
19:
20: You should have received a copy of the GNU General Public License
21: along with this program; if not, see <https://www.gnu.org/licenses/>. */
22:
23: #ifndef C_CTYPE_H
24: #define C_CTYPE_H
25:
26: #include <stdbool.h>
27:
28: #ifndef _GL_INLINE_HEADER_BEGIN
29: #error "Please include config.h first."
30: #endif
31: _GL_INLINE_HEADER_BEGIN
32: #ifndef C_CTYPE_INLINE
33: # define C_CTYPE_INLINE _GL_INLINE
34: #endif
35:
36: #ifdef __cplusplus
37: extern "C" {
38: #endif
39:
40:
41: /* The functions defined in this file assume the "C" locale and a character
42: set without diacritics (ASCII-US or EBCDIC-US or something like that).
43: Even if the "C" locale on a particular system is an extension of the ASCII
44: character set (like on BeOS, where it is UTF-8, or on AmigaOS, where it
45: is ISO-8859-1), the functions in this file recognize only the ASCII
46: characters. */
47:
48:
49: #if (' ' == 32) && ('!' == 33) && ('"' == 34) && ('#' == 35) \
50: && ('%' == 37) && ('&' == 38) && ('\'' == 39) && ('(' == 40) \
51: && (')' == 41) && ('*' == 42) && ('+' == 43) && (',' == 44) \
52: && ('-' == 45) && ('.' == 46) && ('/' == 47) && ('0' == 48) \
53: && ('1' == 49) && ('2' == 50) && ('3' == 51) && ('4' == 52) \
54: && ('5' == 53) && ('6' == 54) && ('7' == 55) && ('8' == 56) \
55: && ('9' == 57) && (':' == 58) && (';' == 59) && ('<' == 60) \
56: && ('=' == 61) && ('>' == 62) && ('?' == 63) && ('A' == 65) \
57: && ('B' == 66) && ('C' == 67) && ('D' == 68) && ('E' == 69) \
58: && ('F' == 70) && ('G' == 71) && ('H' == 72) && ('I' == 73) \
59: && ('J' == 74) && ('K' == 75) && ('L' == 76) && ('M' == 77) \
60: && ('N' == 78) && ('O' == 79) && ('P' == 80) && ('Q' == 81) \
61: && ('R' == 82) && ('S' == 83) && ('T' == 84) && ('U' == 85) \
62: && ('V' == 86) && ('W' == 87) && ('X' == 88) && ('Y' == 89) \
63: && ('Z' == 90) && ('[' == 91) && ('\\' == 92) && (']' == 93) \
64: && ('^' == 94) && ('_' == 95) && ('a' == 97) && ('b' == 98) \
65: && ('c' == 99) && ('d' == 100) && ('e' == 101) && ('f' == 102) \
66: && ('g' == 103) && ('h' == 104) && ('i' == 105) && ('j' == 106) \
67: && ('k' == 107) && ('l' == 108) && ('m' == 109) && ('n' == 110) \
68: && ('o' == 111) && ('p' == 112) && ('q' == 113) && ('r' == 114) \
69: && ('s' == 115) && ('t' == 116) && ('u' == 117) && ('v' == 118) \
70: && ('w' == 119) && ('x' == 120) && ('y' == 121) && ('z' == 122) \
71: && ('{' == 123) && ('|' == 124) && ('}' == 125) && ('~' == 126)
72: /* The character set is ASCII or one of its variants or extensions, not EBCDIC.
73: Testing the value of '\n' and '\r' is not relevant. */
74: # define C_CTYPE_ASCII 1
75: #elif ! (' ' == '\x40' && '0' == '\xf0' \
76: && 'A' == '\xc1' && 'J' == '\xd1' && 'S' == '\xe2' \
77: && 'a' == '\x81' && 'j' == '\x91' && 's' == '\xa2')
78: # error "Only ASCII and EBCDIC are supported"
79: #endif
80:
81: #if 'A' < 0
82: # error "EBCDIC and char is signed -- not supported"
83: #endif
84:
85: /* Cases for control characters. */
86:
87: #define _C_CTYPE_CNTRL \
88: case '\a': case '\b': case '\f': case '\n': \
89: case '\r': case '\t': case '\v': \
90: _C_CTYPE_OTHER_CNTRL
91:
92: /* ASCII control characters other than those with \-letter escapes. */
93:
94: #if C_CTYPE_ASCII
95: # define _C_CTYPE_OTHER_CNTRL \
96: case '\x00': case '\x01': case '\x02': case '\x03': \
97: case '\x04': case '\x05': case '\x06': case '\x0e': \
98: case '\x0f': case '\x10': case '\x11': case '\x12': \
99: case '\x13': case '\x14': case '\x15': case '\x16': \
100: case '\x17': case '\x18': case '\x19': case '\x1a': \
101: case '\x1b': case '\x1c': case '\x1d': case '\x1e': \
102: case '\x1f': case '\x7f'
103: #else
104: /* Use EBCDIC code page 1047's assignments for ASCII control chars;
105: assume all EBCDIC code pages agree about these assignments. */
106: # define _C_CTYPE_OTHER_CNTRL \
107: case '\x00': case '\x01': case '\x02': case '\x03': \
108: case '\x07': case '\x0e': case '\x0f': case '\x10': \
109: case '\x11': case '\x12': case '\x13': case '\x18': \
110: case '\x19': case '\x1c': case '\x1d': case '\x1e': \
111: case '\x1f': case '\x26': case '\x27': case '\x2d': \
112: case '\x2e': case '\x32': case '\x37': case '\x3c': \
113: case '\x3d': case '\x3f'
114: #endif
115:
116: /* Cases for lowercase hex letters, and lowercase letters, all offset by N. */
117:
118: #define _C_CTYPE_LOWER_A_THRU_F_N(N) \
119: case 'a' + (N): case 'b' + (N): case 'c' + (N): case 'd' + (N): \
120: case 'e' + (N): case 'f' + (N)
121: #define _C_CTYPE_LOWER_N(N) \
122: _C_CTYPE_LOWER_A_THRU_F_N(N): \
123: case 'g' + (N): case 'h' + (N): case 'i' + (N): case 'j' + (N): \
124: case 'k' + (N): case 'l' + (N): case 'm' + (N): case 'n' + (N): \
125: case 'o' + (N): case 'p' + (N): case 'q' + (N): case 'r' + (N): \
126: case 's' + (N): case 't' + (N): case 'u' + (N): case 'v' + (N): \
127: case 'w' + (N): case 'x' + (N): case 'y' + (N): case 'z' + (N)
128:
129: /* Cases for hex letters, digits, lower, punct, and upper. */
130:
131: #define _C_CTYPE_A_THRU_F \
132: _C_CTYPE_LOWER_A_THRU_F_N (0): \
133: _C_CTYPE_LOWER_A_THRU_F_N ('A' - 'a')
134: #define _C_CTYPE_DIGIT \
135: case '0': case '1': case '2': case '3': \
136: case '4': case '5': case '6': case '7': \
137: case '8': case '9'
138: #define _C_CTYPE_LOWER _C_CTYPE_LOWER_N (0)
139: #define _C_CTYPE_PUNCT \
140: case '!': case '"': case '#': case '$': \
141: case '%': case '&': case '\'': case '(': \
142: case ')': case '*': case '+': case ',': \
143: case '-': case '.': case '/': case ':': \
144: case ';': case '<': case '=': case '>': \
145: case '?': case '@': case '[': case '\\': \
146: case ']': case '^': case '_': case '`': \
147: case '{': case '|': case '}': case '~'
148: #define _C_CTYPE_UPPER _C_CTYPE_LOWER_N ('A' - 'a')
149:
150:
151: /* Function definitions. */
152:
153: /* Unlike the functions in <ctype.h>, which require an argument in the range
154: of the 'unsigned char' type, the functions here operate on values that are
155: in the 'unsigned char' range or in the 'char' range. In other words,
156: when you have a 'char' value, you need to cast it before using it as
157: argument to a <ctype.h> function:
158:
159: const char *s = ...;
160: if (isalpha ((unsigned char) *s)) ...
161:
162: but you don't need to cast it for the functions defined in this file:
163:
164: const char *s = ...;
165: if (c_isalpha (*s)) ...
166: */
167:
168: C_CTYPE_INLINE bool
169: c_isalnum (int c)
170: {
171: switch (c)
172: {
173: _C_CTYPE_DIGIT:
174: _C_CTYPE_LOWER:
175: _C_CTYPE_UPPER:
176: return true;
177: default:
178: return false;
179: }
180: }
181:
182: C_CTYPE_INLINE bool
183: c_isalpha (int c)
184: {
185: switch (c)
186: {
187: _C_CTYPE_LOWER:
188: _C_CTYPE_UPPER:
189: return true;
190: default:
191: return false;
192: }
193: }
194:
195: /* The function isascii is not locale dependent.
196: Its use in EBCDIC is questionable. */
197: C_CTYPE_INLINE bool
198: c_isascii (int c)
199: {
200: switch (c)
201: {
202: case ' ':
203: _C_CTYPE_CNTRL:
204: _C_CTYPE_DIGIT:
205: _C_CTYPE_LOWER:
206: _C_CTYPE_PUNCT:
207: _C_CTYPE_UPPER:
208: return true;
209: default:
210: return false;
211: }
212: }
213:
214: C_CTYPE_INLINE bool
215: c_isblank (int c)
216: {
217: return c == ' ' || c == '\t';
218: }
219:
220: C_CTYPE_INLINE bool
221: c_iscntrl (int c)
222: {
223: switch (c)
224: {
225: _C_CTYPE_CNTRL:
226: return true;
227: default:
228: return false;
229: }
230: }
231:
232: C_CTYPE_INLINE bool
233: c_isdigit (int c)
234: {
235: switch (c)
236: {
237: _C_CTYPE_DIGIT:
238: return true;
239: default:
240: return false;
241: }
242: }
243:
244: C_CTYPE_INLINE bool
245: c_isgraph (int c)
246: {
247: switch (c)
248: {
249: _C_CTYPE_DIGIT:
250: _C_CTYPE_LOWER:
251: _C_CTYPE_PUNCT:
252: _C_CTYPE_UPPER:
253: return true;
254: default:
255: return false;
256: }
257: }
258:
259: C_CTYPE_INLINE bool
260: c_islower (int c)
261: {
262: switch (c)
263: {
264: _C_CTYPE_LOWER:
265: return true;
266: default:
267: return false;
268: }
269: }
270:
271: C_CTYPE_INLINE bool
272: c_isprint (int c)
273: {
274: switch (c)
275: {
276: case ' ':
277: _C_CTYPE_DIGIT:
278: _C_CTYPE_LOWER:
279: _C_CTYPE_PUNCT:
280: _C_CTYPE_UPPER:
281: return true;
282: default:
283: return false;
284: }
285: }
286:
287: C_CTYPE_INLINE bool
288: c_ispunct (int c)
289: {
290: switch (c)
291: {
292: _C_CTYPE_PUNCT:
293: return true;
294: default:
295: return false;
296: }
297: }
298:
299: C_CTYPE_INLINE bool
300: c_isspace (int c)
301: {
302: switch (c)
303: {
304: case ' ': case '\t': case '\n': case '\v': case '\f': case '\r':
305: return true;
306: default:
307: return false;
308: }
309: }
310:
311: C_CTYPE_INLINE bool
312: c_isupper (int c)
313: {
314: switch (c)
315: {
316: _C_CTYPE_UPPER:
317: return true;
318: default:
319: return false;
320: }
321: }
322:
323: C_CTYPE_INLINE bool
324: c_isxdigit (int c)
325: {
326: switch (c)
327: {
328: _C_CTYPE_DIGIT:
329: _C_CTYPE_A_THRU_F:
330: return true;
331: default:
332: return false;
333: }
334: }
335:
336: C_CTYPE_INLINE int
337: c_tolower (int c)
338: {
339: switch (c)
340: {
341: _C_CTYPE_UPPER:
342: return c - 'A' + 'a';
343: default:
344: return c;
345: }
346: }
347:
348: C_CTYPE_INLINE int
349: c_toupper (int c)
350: {
351: switch (c)
352: {
353: _C_CTYPE_LOWER:
354: return c - 'a' + 'A';
355: default:
356: return c;
357: }
358: }
359:
360: #ifdef __cplusplus
361: }
362: #endif
363:
364: _GL_INLINE_HEADER_END
365:
366: #endif /* C_CTYPE_H */
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