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If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner] 10 .TH CTYPE 3C "Jan 28, 2005" 11 .SH NAME 12 ctype, isalpha, isalnum, isascii, isblank, iscntrl, isdigit, islower, isprint, 13 isspace, isupper, ispunct, isgraph, isxdigit \- character handling 14 .SH SYNOPSIS 15 .LP 16 .nf 17 #include <ctype.h> 18 19 \fBint\fR \fBisalpha\fR(\fBint\fR \fIc\fR); 20 .fi 21 22 .LP 23 .nf 24 \fBint\fR \fBisalnum\fR(\fBint\fR \fIc\fR); 25 .fi 26 27 .LP 28 .nf 29 \fBint\fR \fBisascii\fR(\fBint\fR \fIc\fR); 30 .fi 31 32 .LP 33 .nf 34 \fBint\fR \fBisblank\fR(\fBint\fR \fIc\fR); 35 .fi 36 37 .LP 38 .nf 39 \fBint\fR \fBiscntrl\fR(\fBint\fR \fIc\fR); 40 .fi 41 42 .LP 43 .nf 44 \fBint\fR \fBisdigit\fR(\fBint\fR \fIc\fR); 45 .fi 46 47 .LP 48 .nf 49 \fBint\fR \fBisgraph\fR(\fBint\fR \fIc\fR); 50 .fi 51 52 .LP 53 .nf 54 \fBint\fR \fBislower\fR(\fBint\fR \fIc\fR); 55 .fi 56 57 .LP 58 .nf 59 \fBint\fR \fBisprint\fR(\fBint\fR \fIc\fR); 60 .fi 61 62 .LP 63 .nf 64 \fBint\fR \fBispunct\fR(\fBint\fR \fIc\fR); 65 .fi 66 67 .LP 68 .nf 69 \fBint\fR \fBisspace\fR(\fBint\fR \fIc\fR); 70 .fi 71 72 .LP 73 .nf 74 \fBint\fR \fBisupper\fR(\fBint\fR \fIc\fR); 75 .fi 76 77 .LP 78 .nf 79 \fBint\fR \fBisxdigit\fR(\fBint\fR \fIc\fR); 80 .fi 81 82 .SH DESCRIPTION 83 .sp 84 .LP 85 These macros classify character-coded integer values. Each is a predicate 86 returning non-zero for true, \fB0\fR for false. The behavior of these macros, 87 except \fBisascii()\fR, is affected by the current locale (see 88 \fBsetlocale\fR(3C)). To modify the behavior, change the \fBLC_TYPE\fR category 89 in \fBsetlocale()\fR, that is, \fBsetlocale(\fR\fBLC_CTYPE\fR, 90 \fInewlocale\fR). In the "C" locale, or in a locale where character type 91 information is not defined, characters are classified according to the rules of 92 the \fBUS-ASCII\fR 7-bit coded character set. 93 .sp 94 .LP 95 The \fBisascii()\fR macro is defined on all integer values. The rest are 96 defined only where the argument is an \fBint\fR, the value of which is 97 representable as an \fBunsigned char\fR, or \fBEOF\fR, which is defined by the 98 <\fBstdio.h\fR> header and represents end-of-file. 99 .sp 100 .LP 101 Functions exist for all the macros defined below. To get the function form, the 102 macro name must be undefined (for example, \fB#undef isdigit\fR). 103 .sp 104 .LP 105 For macros described with \fBDefault\fR and \fBStandard conforming\fR versions, 106 standard-conforming behavior is provided for standard-conforming applications 107 (see \fBstandards\fR(5)) and for applications that define 108 \fB__XPG4_CHAR_CLASS__\fR before including <\fBctype.h\fR>. 109 .SS "Default" 110 .sp 111 .ne 2 112 .na 113 \fB\fBisalpha()\fR\fR 114 .ad 115 .RS 13n 116 Tests for any character for which \fBisupper()\fR or \fBislower()\fR is true. 117 .RE 118 119 .SS "Standard conforming" 120 .sp 121 .ne 2 122 .na 123 \fB\fBisalpha()\fR\fR 124 .ad 125 .RS 13n 126 Tests for any character for which \fBisupper()\fR or \fBislower()\fR is true, 127 or any character that is one of the current locale-defined set of characters 128 for which none of \fBiscntrl()\fR, \fBisdigit()\fR, \fBispunct()\fR, or 129 \fBisspace()\fR is true. In "C" locale, \fBisalpha()\fR returns true only for 130 the characters for which \fBisupper()\fR or \fBislower()\fR is true. 131 .RE 132 133 .sp 134 .ne 2 135 .na 136 \fB\fBisalnum()\fR\fR 137 .ad 138 .RS 13n 139 Tests for any character for which \fBisalpha()\fR or \fBisdigit()\fR is true 140 (letter or digit). 141 .RE 142 143 .sp 144 .ne 2 145 .na 146 \fB\fBisascii()\fR\fR 147 .ad 148 .RS 13n 149 Tests for any ASCII character, code between \fB0\fR and \fB0177\fR inclusive. 150 .RE 151 152 .sp 153 .ne 2 154 .na 155 \fB\fBisblank()\fR\fR 156 .ad 157 .RS 13n 158 Tests whether \fIc\fR is a character of class blank in the current locale. This 159 macro/function is not available to applications conforming to standards prior 160 to SUSv3. See \fBstandards\fR(5) 161 .RE 162 163 .sp 164 .ne 2 165 .na 166 \fB\fBiscntrl()\fR\fR 167 .ad 168 .RS 13n 169 Tests for any ``control character'' as defined by the character set. 170 .RE 171 172 .sp 173 .ne 2 174 .na 175 \fB\fBisdigit()\fR\fR 176 .ad 177 .RS 13n 178 Tests for any decimal-digit character. 179 .RE 180 181 .SS "Default" 182 .sp 183 .ne 2 184 .na 185 \fB\fBisgraph()\fR\fR 186 .ad 187 .RS 13n 188 Tests for any character for which \fBispunct()\fR, \fBisupper()\fR, 189 \fBislower()\fR, and \fBisdigit()\fR is true. 190 .RE 191 192 .SS "Standard conforming" 193 .sp 194 .ne 2 195 .na 196 \fB\fBisgraph()\fR\fR 197 .ad 198 .RS 13n 199 Tests for any character for which \fBisalnum()\fR and \fBispunct()\fR are true, 200 or any character in the current locale-defined "graph" class which is neither a 201 space ("\|") nor a character for which \fBiscntrl()\fR is true. 202 .RE 203 204 .sp 205 .ne 2 206 .na 207 \fB\fBislower()\fR\fR 208 .ad 209 .RS 13n 210 Tests for any character that is a lower-case letter or is one of the current 211 locale-defined set of characters for which none of \fBiscntrl()\fR, 212 \fBisdigit()\fR, \fBispunct()\fR, \fBisspace()\fR, or \fBisupper()\fR is true. 213 In the "C" locale, \fBislower()\fR returns true only for the characters defined 214 as lower-case \fBASCII\fR characters. 215 .RE 216 217 .SS "Default" 218 .sp 219 .ne 2 220 .na 221 \fB\fBisprint()\fR\fR 222 .ad 223 .RS 13n 224 Tests for any character for which \fBispunct()\fR, \fBisupper()\fR, 225 \fBislower()\fR, \fBisdigit()\fR, and the space character ("\|") is true. 226 .RE 227 228 .SS "Standard conforming" 229 .sp 230 .ne 2 231 .na 232 \fB\fBisprint()\fR\fR 233 .ad 234 .RS 13n 235 Tests for any character for which \fBiscntrl()\fR is false, and 236 \fBisalnum()\fR, \fBisgraph()\fR, \fBispunct()\fR, the space character ("\|"), 237 and the characters in the current locale-defined "print" class are true. 238 .RE 239 240 .sp 241 .ne 2 242 .na 243 \fB\fBispunct()\fR\fR 244 .ad 245 .RS 13n 246 Tests for any printing character which is neither a space ("\|") nor a 247 character for which \fBisalnum()\fR or \fBiscntrl()\fR is true. 248 .RE 249 250 .sp 251 .ne 2 252 .na 253 \fB\fBisspace()\fR\fR 254 .ad 255 .RS 13n 256 Tests for any space, tab, carriage-return, newline, vertical-tab or form-feed 257 (standard white-space characters) or for one of the current locale-defined set 258 of characters for which \fBisalnum()\fR is false. In the "C" locale, 259 \fBisspace()\fR returns true only for the standard white-space characters. 260 .RE 261 262 .sp 263 .ne 2 264 .na 265 \fB\fBisupper()\fR\fR 266 .ad 267 .RS 13n 268 Tests for any character that is an upper-case letter or is one of the current 269 locale-defined set of characters for which none of \fBiscntrl()\fR, 270 \fBisdigit()\fR, \fBispunct()\fR, \fBisspace()\fR, or \fBislower()\fR is true. 271 In the "C" locale, \fBisupper()\fR returns true only for the characters defined 272 as upper-case \fBASCII\fR characters. 273 .RE 274 275 .SS "Default" 276 .sp 277 .ne 2 278 .na 279 \fB\fBisxdigit()\fR\fR 280 .ad 281 .RS 14n 282 Tests for any hexadecimal-digit character (\fB[0\(mi9]\fR, \fB[A\(miF]\fR, or 283 \fB[a\(mif]\fR). 284 .RE 285 286 .SS "Standard conforming" 287 .sp 288 .ne 2 289 .na 290 \fB\fBisxdigit()\fR\fR 291 .ad 292 .RS 14n 293 Tests for any hexadecimal-digit character (\fB[0\(mi9]\fR, \fB[A\(miF]\fR, or 294 \fB[a\(mif]\fR or the current locale-defined sets of characters representing 295 the hexadecimal digits \fB10\fR to \fB15\fR inclusive). In the "C" locale, only 296 .sp 297 .in +2 298 .nf 299 0 1 2 3 4 5 6 7 8 9 A B C D E F a b c d e f 300 .fi 301 .in -2 302 303 are included. 304 .RE 305 306 .SH RETURN VALUES 307 .sp 308 .LP 309 If the argument to any of the character handling macros is not in the domain of 310 the function, the result is undefined. Otherwise, the macro or function returns 311 non-zero if the classification is \fBTRUE\fR and \fB0\fR if the classification 312 is \fBFALSE\fR. 313 .SH USAGE 314 .sp 315 .LP 316 These macros or functions can be used safely in multithreaded applications, as 317 long as \fBsetlocale\fR(3C) is not being called to change the locale. 318 .SH ATTRIBUTES 319 .sp 320 .LP 321 See \fBattributes\fR(5) for descriptions of the following attributes: 322 .sp 323 324 .sp 325 .TS 326 box; 327 l l 328 l l . 329 ATTRIBUTE TYPE ATTRIBUTE VALUE 330 CSI Enabled 331 Interface Stability Standard 332 MT-Level MT-Safe with exceptions 333 .TE 334 335 .SH SEE ALSO 336 .sp 337 .LP 338 \fBsetlocale\fR(3C), \fBstdio\fR(3C), \fBascii\fR(5), \fBenviron\fR(5), 339 \fBstandards\fR(5)