Manual Pages  — ISPRINT

isprint, isprint_l – printing character test (space character inclusive)

LIBRARY SYNOPSIS DESCRIPTION RETURN VALUES COMPATIBILITY SEE ALSO STANDARDS HISTORY

Standard C Library (libc, -lc)

#include <ctype.h>

int
isprint(int c);

int
isprint_l(int c, locale_t loc);

The isprint() and isprint_l() functions test for any printing character, including space (‘ ’). 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):

amp;040 sp	041 ``!''	042 `` ''	043 ``#''	044 ``$''
amp;045 ``%''	046 ``&''	047 ``'''	050 ``(''	051 ``)''
amp;052 ``*''	053 ``+''	054 ``,''	055 ``-''	056 ``.''
amp;057 ``/''	060 ``0''	061 ``1''	062 ``2''	063 ``3''
amp;064 ``4''	065 ``5''	066 ``6''	067 ``7''	070 ``8''
amp;071 ``9''	072 ``:''	073 ``;''	074 ``<''	075 ``=''
amp;076 ``>''	077 ``?''	100 ``@''	101 ``A''	102 ``B''
amp;103 ``C''	104 ``D''	105 ``E''	106 ``F''	107 ``G''
amp;110 ``H''	111 ``I''	112 ``J''	113 ``K''	114 ``L''
amp;115 ``M''	116 ``N''	117 ``O''	120 ``P''	121 ``Q''
amp;122 ``R''	123 ``S''	124 ``T''	125 ``U''	126 ``V''
amp;127 ``W''	130 ``X''	131 ``Y''	132 ``Z''	133 ``[''
amp;134 ``\''	135 ``]''	136 ``^''	137 ``_''	140 ```''
amp;141 ``a''	142 ``b''	143 ``c''	144 ``d''	145 ``e''
amp;146 ``f''	147 ``g''	150 ``h''	151 ``i''	152 ``j''
amp;153 ``k''	154 ``l''	155 ``m''	156 ``n''	157 ``o''
amp;160 ``p''	161 ``q''	162 ``r''	163 ``s''	164 ``t''
amp;165 ``u''	166 ``v''	167 ``w''	170 ``x''	171 ``y''
amp;172 ``z''	173 ``{''	174 ``|''	175 ``}''	176 ``~''

The isprint_l() function takes an explicit locale argument, whereas the isprint() function uses the current global or per-thread locale.

The isprint() and isprint_l() functions return zero if the character tests false and return non-zero if the character tests true.

The BSD 4.4 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 iswprint() or iswprint_l() function should be used instead.

The isprint() function conforms to ISO/IEC 9899:1990 ("ISO C90").

The isprint() function first appeared in AT&T v7 .