Annotation of src/lib/libc/gen/isalpha.3, Revision 1.3
1.1 cgd 1: .\" Copyright (c) 1991 The Regents of the University of California.
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1.2 mycroft 36: .\" from: @(#)isalpha.3 5.2 (Berkeley) 6/29/91
1.3 ! jtc 37: .\" $Id: isalpha.3,v 1.2 1993/07/30 08:37:05 mycroft Exp $
1.1 cgd 38: .\"
39: .Dd June 29, 1991
40: .Dt ISALPHA 3
41: .Os
42: .Sh NAME
43: .Nm isalpha
44: .Nd alphabetic character test
45: .Sh SYNOPSIS
46: .Fd #include <ctype.h>
47: .Ft int
48: .Fn isalpha "int c"
49: .Sh DESCRIPTION
50: The
51: .Fn isalpha
52: function tests for any character for which
53: .Xr isupper 3
54: or
55: .Xr islower 3
56: is true and
57: .\" , or any of an implementation-defined set of characters
58: for which none of
59: .Xr iscntrl 3 ,
60: .Xr isdigit 3 ,
61: .Xr ispunct 3 ,
62: or
63: .Xr isspace 3
64: is true.
65: In the
66: .Em ``C''
67: locale,
68: .Fn isalpha
69: returns true only for the characters for which
70: .Xr isupper 3
71: or
72: .Xr islower 3
73: is true.
74: .Sh RETURN VALUES
75: The
76: .Fn isalpha
77: macro returns zero if the character tests false and
78: returns non-zero if the character tests true.
79: .Sh SEE ALSO
1.3 ! jtc 80: .Xr isalnum 3 ,
1.1 cgd 81: .Xr isascii 3 ,
1.3 ! jtc 82: .Xr isblank 3 ,
1.1 cgd 83: .Xr iscntrl 3 ,
84: .Xr isdigit 3 ,
85: .Xr isgraph 3 ,
86: .Xr islower 3 ,
87: .Xr isprint 3 ,
88: .Xr ispunct 3 ,
89: .Xr isspace 3 ,
90: .Xr isupper 3 ,
91: .Xr isxdigit 3 ,
92: .Xr toascii 3 ,
93: .Xr tolower 3 ,
94: .Xr toupper 3 ,
1.3 ! jtc 95: .Xr stdio 3 ,
1.1 cgd 96: .Xr ascii 7
97: .Sh STANDARDS
98: The
99: .Fn isalpha
100: function conforms to
101: .St -ansiC .
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