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ISALPHA(3)	      DragonFly Library Functions Manual	    ISALPHA(3)

NAME

isalpha, isalpha_l -- alphabetic character test

LIBRARY

Standard C Library (libc, -lc)

SYNOPSIS

#include <ctype.h> int isalpha(int c); int isalpha_l(int c, locale_t locale);

DESCRIPTION

The isalpha() and isalpha_l() functions test for any character for which isupper(3) or islower(3) is true. The value of the argument must be rep- resentable as an unsigned char or the value of EOF. In the ASCII character set, this includes the following characters (with their numeric values shown in octal): 101 ``A'' 102 ``B'' 103 ``C'' 104 ``D'' 105 ``E'' 106 ``F'' 107 ``G'' 110 ``H'' 111 ``I'' 112 ``J'' 113 ``K'' 114 ``L'' 115 ``M'' 116 ``N'' 117 ``O'' 120 ``P'' 121 ``Q'' 122 ``R'' 123 ``S'' 124 ``T'' 125 ``U'' 126 ``V'' 127 ``W'' 130 ``X'' 131 ``Y'' 132 ``Z'' 141 ``a'' 142 ``b'' 143 ``c'' 144 ``d'' 145 ``e'' 146 ``f'' 147 ``g'' 150 ``h'' 151 ``i'' 152 ``j'' 153 ``k'' 154 ``l'' 155 ``m'' 156 ``n'' 157 ``o'' 160 ``p'' 161 ``q'' 162 ``r'' 163 ``s'' 164 ``t'' 165 ``u'' 166 ``v'' 167 ``w'' 170 ``x'' 171 ``y'' 172 ``z'' The isalpha_l() function takes an explicit locale argument, whereas the isalpha() function uses the current global or per-thread locale.

RETURN VALUES

The isalpha() and isalpha_l() functions return zero if the character tests false and returns non-zero if the character tests true.

COMPATIBILITY

The 4.4BSD extension of accepting arguments outside of the range of the unsigned char type in locales with large character sets is considered obsolete and may not be supported in future releases. The iswalpha() and iswalpha_l() functions should be used instead.

SEE ALSO

ctype(3), ctype_l(3), islower(3), isupper(3), iswalpha(3), iswalpha_l(3), xlocale(3), ascii(7)

STANDARDS

The isalpha() function conforms to ISO/IEC 9899:1990 (``ISO C90''). The isalpha_l() function conforms to IEEE Std 1003.1-2008 (``POSIX.1''). DragonFly 3.7 December 25, 2013 DragonFly 3.7