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Annotated edit history of isalpha(3) version 1, including all changes. View license author blame.
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1 perry 1 ISALPHA
2 !!!ISALPHA
3 NAME
4 SYNOPSIS
5 DESCRIPTION
6 RETURN VALUE
7 CONFORMING TO
8 NOTE
9 SEE ALSO
10 ----
11 !!NAME
12
13
14 isalnum, isalpha, isascii, isblank, iscntrl, isdigit, isgraph, islower, isprint, ispunct, isspace, isupper, isxdigit - character classification routines
15 !!SYNOPSIS
16
17
18 __#include
19 __ ''c''__);
20 int isalpha (int__ ''c''__);
21 int isascii (int__ ''c''__);
22 int isblank (int__ ''c''__);
23 int iscntrl (int__ ''c''__);
24 int isdigit (int__ ''c''__);
25 int isgraph (int__ ''c''__);
26 int islower (int__ ''c''__);
27 int isprint (int__ ''c''__);
28 int ispunct (int__ ''c''__);
29 int isspace (int__ ''c''__);
30 int isupper (int__ ''c''__);
31 int isxdigit (int__ ''c''__);
32 __
33 !!DESCRIPTION
34
35
36 These functions check whether ''c'', which must have the
37 value of an __unsigned char__ or __EOF__, falls into a
38 certain character class according to the current
39 locale.
40
41
42 __isalnum()__
43
44
45 checks for an alphanumeric character; it is equivalent to
46 __(isalpha(__''c''__) ||
47 isdigit(__''c''__))__.
48
49
50 __isalpha()__
51
52
53 checks for an alphabetic character; in the standard
54 ____ locale, it is equivalent to
55 __(isupper(__''c''__) ||
56 islower(__''c''__))__. In some locales, there may be
57 additional characters for which __isalpha()__ is
58 true--letters which are neither upper case nor lower
59 case.
60
61
62 __isascii()__
63
64
65 checks whether ''c'' is a 7-bit ''unsigned char''
66 value that fits into the ASCII character set. This function
67 is a BSD extension and is also an SVID
68 extension.
69
70
71 __isblank()__
72
73
74 checks for a blank character; that is, a space or a tab.
75 This function is a GNU extension.
76
77
78 __iscntrl()__
79
80
81 checks for a control character.
82
83
84 __isdigit()__
85
86
87 checks for a digit (0 through 9).
88
89
90 __isgraph()__
91
92
93 checks for any printable character except
94 space.
95
96
97 __islower()__
98
99
100 checks for a lower-case character.
101
102
103 __isprint()__
104
105
106 checks for any printable character including
107 space.
108
109
110 __ispunct()__
111
112
113 checks for any printable character which is not a space or
114 an alphanumeric character.
115
116
117 __isspace()__
118
119
120 checks for white-space characters. In the
121 ____ and ____ locales,
122 these are: space, form-feed (__'f'__), newline
123 (__'n'__), carriage return (__'r'__), horizontal tab
124 (__'t'__), and vertical tab (__'v'__).
125
126
127 __isupper()__
128
129
130 checks for an uppercase letter.
131
132
133 __isxdigit()__
134
135
136 checks for a hexadecimal digits, i.e. one of __0 1 2 3 4 5
137 6 7 8 9 a b c d e f A B C D E F__.
138 !!RETURN VALUE
139
140
141 The values returned are nonzero if the character ''c''
142 falls into the tested class, and a zero value if
143 not.
144 !!CONFORMING TO
145
146
147 ANSI - C, BSD 4.3. __isascii()__ is a BSD extension and
148 is also an SVID extension. __isblank()__ is a GNU
149 extension.
150 !!NOTE
151
152
153 The details of what characters belong into which class
154 depend on the current locale. For example, __isupper()__
155 will not recognize an A - umlaut as an uppercase letter in
156 the default __C__ locale.
157 !!SEE ALSO
158
159
160 tolower(3), toupper(3), setlocale(3),
161 ascii(7), locale(7)
162 ----
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