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      1 /* $NetBSD: isctype.c,v 1.29 2025/09/15 00:11:54 riastradh Exp $ */
      2 
      3 /*-
      4  * Copyright (c)2008 Citrus Project,
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 #if defined(LIBC_SCCS) && !defined(lint)
     31 __RCSID("$NetBSD: isctype.c,v 1.29 2025/09/15 00:11:54 riastradh Exp $");
     32 #endif /* LIBC_SCCS and not lint */
     33 
     34 #include "namespace.h"
     35 #include <sys/types.h>
     36 #include <sys/ctype_bits.h>
     37 #define _CTYPE_NOINLINE
     38 #include <ctype.h>
     39 #include <langinfo.h>
     40 #define __SETLOCALE_SOURCE__
     41 #include <locale.h>
     42 #include <stdio.h>
     43 #include <stdlib.h>
     44 #include <string.h>
     45 #include <unistd.h>
     46 
     47 #if EOF != -1
     48 #error "EOF != -1"
     49 #endif
     50 
     51 #include "ctype_guard.h"
     52 #include "runetype_local.h"
     53 #include "setlocale_local.h"
     54 
     55 #define _RUNE_LOCALE(loc) \
     56     ((_RuneLocale *)((loc)->part_impl[LC_CTYPE]))
     57 
     58 static int __noinline
     59 ctype_nasaldemon(const char *func, int c)
     60 {
     61 	char buf[128];
     62 
     63 	snprintf_ss(buf, sizeof(buf), "ctype(3) %s: invalid input: %d\n", func,
     64 	    c);
     65 	(void)write(STDERR_FILENO, buf, strlen(buf));
     66 	if (allow_ctype_abuse())
     67 		return -1;
     68 	abort();
     69 }
     70 
     71 #define	CTYPE_CHECK(c) do						      \
     72 {									      \
     73 	if (__predict_false(((c) != EOF && (c) < 0) || (c) > UCHAR_MAX))      \
     74 		return ctype_nasaldemon(__func__, c);			      \
     75 } while (0)
     76 
     77 #define _ISCTYPE_FUNC(name, bit) \
     78 int \
     79 is##name(int c) \
     80 { \
     81 	CTYPE_CHECK(c); \
     82 	return (int)_ctype_tab_[c + 1] & (bit); \
     83 } \
     84 int \
     85 is##name ## _l(int c, locale_t loc) \
     86 { \
     87 	CTYPE_CHECK(c); \
     88 	return (int)((_RUNE_LOCALE(loc)->rl_ctype_tab[c + 1]) & (bit)); \
     89 }
     90 
     91 _ISCTYPE_FUNC(alnum, (_CTYPE_A|_CTYPE_D))
     92 _ISCTYPE_FUNC(alpha,  _CTYPE_A)
     93 _ISCTYPE_FUNC(blank,  _CTYPE_BL)
     94 _ISCTYPE_FUNC(cntrl,  _CTYPE_C            )
     95 _ISCTYPE_FUNC(digit,  _CTYPE_D)
     96 _ISCTYPE_FUNC(graph,  _CTYPE_G)
     97 _ISCTYPE_FUNC(lower,  _CTYPE_L            )
     98 _ISCTYPE_FUNC(print,  _CTYPE_R)
     99 _ISCTYPE_FUNC(punct,  _CTYPE_P            )
    100 _ISCTYPE_FUNC(space,  _CTYPE_S            )
    101 _ISCTYPE_FUNC(upper,  _CTYPE_U            )
    102 _ISCTYPE_FUNC(xdigit, _CTYPE_X)
    103 
    104 int
    105 toupper(int c)
    106 {
    107 	CTYPE_CHECK(c);
    108 	return (int)_toupper_tab_[c + 1];
    109 }
    110 
    111 int
    112 toupper_l(int c, locale_t loc)
    113 {
    114 	CTYPE_CHECK(c);
    115 	return (int)(_RUNE_LOCALE(loc)->rl_toupper_tab[c + 1]);
    116 }
    117 
    118 int
    119 tolower(int c)
    120 {
    121 	CTYPE_CHECK(c);
    122 	return (int)_tolower_tab_[c + 1];
    123 }
    124 
    125 int
    126 tolower_l(int c, locale_t loc)
    127 {
    128 	CTYPE_CHECK(c);
    129 	return (int)(_RUNE_LOCALE(loc)->rl_tolower_tab[c + 1]);
    130 }
    131 
    132 int
    133 _toupper(int c)
    134 {
    135 	return (c - 'a' + 'A');
    136 }
    137 
    138 int
    139 _tolower(int c)
    140 {
    141 	return (c - 'A' + 'a');
    142 }
    143