2 .\" Copyright 2014 Garrett D'Amore <garrett@damore.org>
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12 .TH CTYPE 3C "Mar 14, 2016"
14 ctype, isalpha, isalnum, isascii, isblank, iscntrl, isdigit, islower,
15 isprint, isspace, isupper, ispunct, isgraph, isxdigit, isalpha_l,
16 isalnum_l, isblank_l, iscntrl_l, isdigit_l, islower_l, isprint_l,
17 isspace_l, isupper_l, ispunct_l, isgraph_l, isxdigit_l \- character handling
23 \fBint\fR \fBisalpha\fR(\fBint\fR \fIc\fR);
27 \fBint\fR \fBisalnum\fR(\fBint\fR \fIc\fR);
31 \fBint\fR \fBisascii\fR(\fBint\fR \fIc\fR);
35 \fBint\fR \fBisblank\fR(\fBint\fR \fIc\fR);
39 \fBint\fR \fBiscntrl\fR(\fBint\fR \fIc\fR);
43 \fBint\fR \fBisdigit\fR(\fBint\fR \fIc\fR);
47 \fBint\fR \fBisgraph\fR(\fBint\fR \fIc\fR);
51 \fBint\fR \fBislower\fR(\fBint\fR \fIc\fR);
55 \fBint\fR \fBisprint\fR(\fBint\fR \fIc\fR);
59 \fBint\fR \fBispunct\fR(\fBint\fR \fIc\fR);
63 \fBint\fR \fBisspace\fR(\fBint\fR \fIc\fR);
67 \fBint\fR \fBisupper\fR(\fBint\fR \fIc\fR);
71 \fBint\fR \fBisxdigit\fR(\fBint\fR \fIc\fR);
75 \fBint\fR \fBisalpha_l\fR(\fBint\fR \fIc\fR, \fBlocale_t\fR \fIloc\fR);
79 \fBint\fR \fBisalnum_l\fR(\fBint\fR \fIc\fR, \fBlocale_t\fR \fIloc\fR);
83 \fBint\fR \fBisblank_l\fR(\fBint\fR \fIc\fR, \fBlocale_t\fR \fIloc\fR);
87 \fBint\fR \fBiscntrl_l\fR(\fBint\fR \fIc\fR, \fBlocale_t\fR \fIloc\fR);
91 \fBint\fR \fBisdigit_l\fR(\fBint\fR \fIc\fR, \fBlocale_t\fR \fIloc\fR);
95 \fBint\fR \fBisgraph_l\fR(\fBint\fR \fIc\fR, \fBlocale_t\fR \fIloc\fR);
99 \fBint\fR \fBislower_l\fR(\fBint\fR \fIc\fR, \fBlocale_t\fR \fIloc\fR);
103 \fBint\fR \fBisprint_l\fR(\fBint\fR \fIc\fR, \fBlocale_t\fR \fIloc\fR);
107 \fBint\fR \fBispunct_l\fR(\fBint\fR \fIc\fR, \fBlocale_t\fR \fIloc\fR);
111 \fBint\fR \fBisspace_l\fR(\fBint\fR \fIc\fR, \fBlocale_t\fR \fIloc\fR);
115 \fBint\fR \fBisupper_l\fR(\fBint\fR \fIc\fR, \fBlocale_t\fR \fIloc\fR);
119 \fBint\fR \fBisxdigit_l\fR(\fBint\fR \fIc\fR, \fBlocale_t\fR \fIloc\fR);
123 These functions classify character-coded integer values. Each is a
124 predicate returning non-zero for true, \fB0\fR for false. The behavior
125 of these macros, except \fBisascii()\fR, is affected by the current
126 locale (see \fBsetlocale\fR(3C) and \fBuselocale\fR(3C)). To modify
127 the behavior, change the \fBLC_TYPE\fR category in \fBsetlocale()\fR, that is,
128 \fBsetlocale(\fR\fBLC_CTYPE\fR, \fInewlocale\fR). In the "C" locale,
129 or in a locale where character type information is not defined,
130 characters are classified according to the rules of the \fBUS-ASCII\fR
131 7-bit coded character set.
133 The functions \fBisalnum_l()\fR, \fBisalpha_l()\fR, \fBisblank_l()\fR,
134 \fBiscntrl_l\fR, \fBisdigit_l()\fR, \fBisgraph_l()\fr,
135 \fBislower_l()\fR, \fBisprint_l()\fR, \fBispunct_l()\fR,
136 \fBisspace_l()\fR, \fBisupper_l()\fR, and \fBisxdigit_l()\fR all behave
137 identically to their counterparts without the '\fB_l\fR' prefix, except
138 that instead of acting on the current locale, they perform the test on
139 the locale specified in the argument \fIloc\fR.
141 The \fBisascii()\fR macro is defined on all integer values. The rest are
142 defined only where the argument is an \fBint\fR, the value of which is
143 representable as an \fBunsigned char\fR, or \fBEOF\fR, which is defined by the
144 <\fBstdio.h\fR> header and represents end-of-file.
148 \fB\fBisalpha()\fR\fR
151 Tests for any character for which \fBisupper()\fR or \fBislower()\fR is true,
152 or any character that is one of the current locale-defined set of characters
153 for which none of \fBiscntrl()\fR, \fBisdigit()\fR, \fBispunct()\fR, or
154 \fBisspace()\fR is true. In "C" locale, \fBisalpha()\fR returns true only for
155 the characters for which \fBisupper()\fR or \fBislower()\fR is true.
161 \fB\fBisalnum()\fR\fR
164 Tests for any character for which \fBisalpha()\fR or \fBisdigit()\fR is true
171 \fB\fBisascii()\fR\fR
174 Tests for any ASCII character, code between \fB0\fR and \fB0177\fR inclusive.
180 \fB\fBisblank()\fR\fR
183 Tests whether \fIc\fR is a character of class blank in the current locale. This
184 macro/function is not available to applications conforming to standards prior
185 to SUSv3. See \fBstandards\fR(5)
191 \fB\fBiscntrl()\fR\fR
194 Tests for any ``control character'' as defined by the character set.
200 \fB\fBisdigit()\fR\fR
203 Tests for any decimal-digit character.
209 \fB\fBisgraph()\fR\fR
212 Tests for any character for which \fBisalnum()\fR and \fBispunct()\fR are true,
213 or any character in the current locale-defined "graph" class which is neither a
214 space ("\|") nor a character for which \fBiscntrl()\fR is true.
220 \fB\fBislower()\fR\fR
223 Tests for any character that is a lower-case letter or is one of the current
224 locale-defined set of characters for which none of \fBiscntrl()\fR,
225 \fBisdigit()\fR, \fBispunct()\fR, \fBisspace()\fR, or \fBisupper()\fR is true.
226 In the "C" locale, \fBislower()\fR returns true only for the characters defined
227 as lower-case \fBASCII\fR characters.
233 \fB\fBisprint()\fR\fR
236 Tests for any character for which \fBiscntrl()\fR is false, and
237 \fBisalnum()\fR, \fBisgraph()\fR, \fBispunct()\fR, the space character ("\|"),
238 and the characters in the current locale-defined "print" class are true.
244 \fB\fBispunct()\fR\fR
247 Tests for any printing character which is neither a space ("\|") nor a
248 character for which \fBisalnum()\fR or \fBiscntrl()\fR is true.
254 \fB\fBisspace()\fR\fR
257 Tests for any space, tab, carriage-return, newline, vertical-tab or form-feed
258 (standard white-space characters) or for one of the current locale-defined set
259 of characters for which \fBisalnum()\fR is false. In the "C" locale,
260 \fBisspace()\fR returns true only for the standard white-space characters.
266 \fB\fBisupper()\fR\fR
269 Tests for any character that is an upper-case letter or is one of the current
270 locale-defined set of characters for which none of \fBiscntrl()\fR,
271 \fBisdigit()\fR, \fBispunct()\fR, \fBisspace()\fR, or \fBislower()\fR is true.
272 In the "C" locale, \fBisupper()\fR returns true only for the characters defined
273 as upper-case \fBASCII\fR characters.
279 \fB\fBisxdigit()\fR\fR
282 Tests for any hexadecimal-digit character (\fB[0\(mi9]\fR, \fB[A\(miF]\fR, or
283 \fB[a\(mif]\fR or the current locale-defined sets of characters representing
284 the hexadecimal digits \fB10\fR to \fB15\fR inclusive). In the "C" locale, only
288 0 1 2 3 4 5 6 7 8 9 A B C D E F a b c d e f
297 If the argument to any of the character handling macros is not in the domain of
298 the function, the result is undefined. Otherwise, the macro or function returns
299 non-zero if the classification is \fBTRUE\fR and \fB0\fR if the classification
303 See \fBattributes\fR(5) for descriptions of the following attributes:
308 ATTRIBUTE TYPE ATTRIBUTE VALUE
312 Interface Stability Standard
319 \fBnewlocale\fR(3C), \fBsetlocale\fR(3C), \fBuselocale\fR(3C),
320 \fBstdio\fR(3C), \fBascii\fR(5), \fBenviron\fR(5),