1 /*****************************************************************************/
2 /* */
3 /* chartype.c */
4 /* */
5 /* Character classification functions */
6 /* */
7 /* */
8 /* */
9 /* (C) 2000-2004 Ullrich von Bassewitz */
10 /* Roemerstrasse 52 */
11 /* D-70794 Filderstadt */
12 /* EMail: uz@cc65.org */
13 /* */
14 /* */
15 /* This software is provided 'as-is', without any expressed or implied */
16 /* warranty. In no event will the authors be held liable for any damages */
17 /* arising from the use of this software. */
18 /* */
19 /* Permission is granted to anyone to use this software for any purpose, */
20 /* including commercial applications, and to alter it and redistribute it */
21 /* freely, subject to the following restrictions: */
22 /* */
23 /* 1. The origin of this software must not be misrepresented; you must not */
24 /* claim that you wrote the original software. If you use this software */
25 /* in a product, an acknowledgment in the product documentation would be */
26 /* appreciated but is not required. */
27 /* 2. Altered source versions must be plainly marked as such, and must not */
28 /* be misrepresented as being the original software. */
29 /* 3. This notice may not be removed or altered from any source */
30 /* distribution. */
31 /* */
32 /*****************************************************************************/
33
34
35
36 #include "chartype.h"
37
38
39
40 /* This module contains replacements for functions in ctype.h besides other
41 ** functions. There is a problem with using ctype.h directly:
42 ** The parameter must have a value of "unsigned char" or EOF.
43 ** So on platforms where a char is signed, this may give problems or at
44 ** least warnings. The wrapper functions below will have an "char" parameter
45 ** but handle it correctly. They will NOT work for EOF, but this is not a
46 ** problem, since EOF is always handled separately.
47 */
48
49
50
51 /*****************************************************************************/
52 /* Code */
53 /*****************************************************************************/
54
55
56
IsAlpha(char C)57 int IsAlpha (char C)
58 /* Check for a letter */
59 {
60 return (C >= 'a' && C <= 'z') || (C >= 'A' && C <= 'Z');
61 }
62
63
64
IsAlNum(char C)65 int IsAlNum (char C)
66 /* Check for letter or digit */
67 {
68 return (C >= 'a' && C <= 'z') || (C >= 'A' && C <= 'Z') || (C >= '0' && C <= '9');
69 }
70
71
72
IsAscii(char C)73 int IsAscii (char C)
74 /* Check for an ASCII character */
75 {
76 return (C & ~0x7F) == 0;
77 }
78
79
80
IsBlank(char C)81 int IsBlank (char C)
82 /* Check for a space or tab */
83 {
84 return (C == ' ' || C == '\t');
85 }
86
87
88
IsSpace(char C)89 int IsSpace (char C)
90 /* Check for any white space characters */
91 {
92 return (C == ' ' || C == '\n' || C == '\r' || C == '\t' || C == '\v' || C == '\f');
93 }
94
95
96
IsDigit(char C)97 int IsDigit (char C)
98 /* Check for a digit */
99 {
100 return (C >= '0' && C <= '9');
101 }
102
103
104
IsLower(char C)105 int IsLower (char C)
106 /* Check for a lower case char */
107 {
108 return (C >= 'a' && C <= 'z');
109 }
110
111
112
IsUpper(char C)113 int IsUpper (char C)
114 /* Check for upper case characters */
115 {
116 return (C >= 'A' && C <= 'Z');
117 }
118
119
120
IsBDigit(char C)121 int IsBDigit (char C)
122 /* Check for binary digits (0/1) */
123 {
124 return (C == '0' || C == '1');
125 }
126
127
128
IsODigit(char C)129 int IsODigit (char C)
130 /* Check for octal digits (0..7) */
131 {
132 return (C >= '0' && C <= '7');
133 }
134
135
136
IsXDigit(char C)137 int IsXDigit (char C)
138 /* Check for hexadecimal digits */
139 {
140 return (C >= 'a' && C <= 'f') || (C >= 'A' && C <= 'F') || (C >= '0' && C <= '9');
141 }
142
143
144
IsQuote(char C)145 int IsQuote (char C)
146 /* Check for a single or double quote */
147 {
148 return (C == '"' || C == '\'');
149 }
150