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ISALNUM(3) FreeBSD Library Functions Manual ISALNUM(3) NAME isalnum -- alphanumeric character test LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <ctype.h> int isalnum(int c); int isalnum_l(int c, locale_t loc); DESCRIPTION The isalnum() function tests for any character for which isalpha(3) or isdigit(3) is true. The value of the argument must be representable 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): 060 ``0'' 061 ``1'' 062 ``2'' 063 ``3'' 064 ``4'' 065 ``5'' 066 ``6'' 067 ``7'' 070 ``8'' 071 ``9'' 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 isalnum_l() function takes an explicit locale argument, whereas the isalnum() function uses the current global or per-thread locale. RETURN VALUES The isalnum() function returns zero if the character tests false and re- turns 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 ob- solete and may not be supported in future releases. The iswalnum() func- tion should be used instead. SEE ALSO ctype(3), isalpha(3), isdigit(3), iswalnum(3), xlocale(3), ascii(7) STANDARDS The isalnum() function conforms to ISO/IEC 9899:1990 ("ISO C90"). The isalnum_l() function conforms to IEEE Std 1003.1-2008 ("POSIX.1"). FreeBSD 13.0 July 17, 2005 FreeBSD 13.0
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | COMPATIBILITY | SEE ALSO | STANDARDS
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