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1 /* <ctype.h> replacement macros.
2 
3    Copyright (C) 2000-2017 Free Software Foundation, Inc.
4    Contributed by Zack Weinberg <zackw@stanford.edu>.
5 
6 This file is part of the libiberty library.
7 Libiberty is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Library General Public
9 License as published by the Free Software Foundation; either
10 version 2 of the License, or (at your option) any later version.
11 
12 Libiberty is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 Library General Public License for more details.
16 
17 You should have received a copy of the GNU Library General Public
18 License along with libiberty; see the file COPYING.LIB.  If
19 not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
20 Boston, MA 02110-1301, USA.  */
21 
22 /* This is a compatible replacement of the standard C library's <ctype.h>
23    with the following properties:
24 
25    - Implements all isxxx() macros required by C99.
26    - Also implements some character classes useful when
27      parsing C-like languages.
28    - Does not change behavior depending on the current locale.
29    - Behaves properly for all values in the range of a signed or
30      unsigned char.
31 
32    To avoid conflicts, this header defines the isxxx functions in upper
33    case, e.g. ISALPHA not isalpha.  */
34 
35 #ifndef SAFE_CTYPE_H
36 #define SAFE_CTYPE_H
37 
38 /* Determine host character set.  */
39 #define HOST_CHARSET_UNKNOWN 0
40 #define HOST_CHARSET_ASCII   1
41 #define HOST_CHARSET_EBCDIC  2
42 
43 #if  '\n' == 0x0A && ' ' == 0x20 && '0' == 0x30 \
44    && 'A' == 0x41 && 'a' == 0x61 && '!' == 0x21
45 #  define HOST_CHARSET HOST_CHARSET_ASCII
46 #else
47 # if '\n' == 0x15 && ' ' == 0x40 && '0' == 0xF0 \
48    && 'A' == 0xC1 && 'a' == 0x81 && '!' == 0x5A
49 #  define HOST_CHARSET HOST_CHARSET_EBCDIC
50 # else
51 #  define HOST_CHARSET HOST_CHARSET_UNKNOWN
52 # endif
53 #endif
54 
55 /* Categories.  */
56 
57 enum {
58   /* In C99 */
59   _sch_isblank  = 0x0001,	/* space \t */
60   _sch_iscntrl  = 0x0002,	/* nonprinting characters */
61   _sch_isdigit  = 0x0004,	/* 0-9 */
62   _sch_islower  = 0x0008,	/* a-z */
63   _sch_isprint  = 0x0010,	/* any printing character including ' ' */
64   _sch_ispunct  = 0x0020,	/* all punctuation */
65   _sch_isspace  = 0x0040,	/* space \t \n \r \f \v */
66   _sch_isupper  = 0x0080,	/* A-Z */
67   _sch_isxdigit = 0x0100,	/* 0-9A-Fa-f */
68 
69   /* Extra categories useful to cpplib.  */
70   _sch_isidst	= 0x0200,	/* A-Za-z_ */
71   _sch_isvsp    = 0x0400,	/* \n \r */
72   _sch_isnvsp   = 0x0800,	/* space \t \f \v \0 */
73 
74   /* Combinations of the above.  */
75   _sch_isalpha  = _sch_isupper|_sch_islower,	/* A-Za-z */
76   _sch_isalnum  = _sch_isalpha|_sch_isdigit,	/* A-Za-z0-9 */
77   _sch_isidnum  = _sch_isidst|_sch_isdigit,	/* A-Za-z0-9_ */
78   _sch_isgraph  = _sch_isalnum|_sch_ispunct,	/* isprint and not space */
79   _sch_iscppsp  = _sch_isvsp|_sch_isnvsp,	/* isspace + \0 */
80   _sch_isbasic  = _sch_isprint|_sch_iscppsp     /* basic charset of ISO C
81 						   (plus ` and @)  */
82 };
83 
84 /* Character classification.  */
85 extern const unsigned short _sch_istable[256];
86 
87 #define _sch_test(c, bit) (_sch_istable[(c) & 0xff] & (unsigned short)(bit))
88 
89 #define ISALPHA(c)  _sch_test(c, _sch_isalpha)
90 #define ISALNUM(c)  _sch_test(c, _sch_isalnum)
91 #define ISBLANK(c)  _sch_test(c, _sch_isblank)
92 #define ISCNTRL(c)  _sch_test(c, _sch_iscntrl)
93 #define ISDIGIT(c)  _sch_test(c, _sch_isdigit)
94 #define ISGRAPH(c)  _sch_test(c, _sch_isgraph)
95 #define ISLOWER(c)  _sch_test(c, _sch_islower)
96 #define ISPRINT(c)  _sch_test(c, _sch_isprint)
97 #define ISPUNCT(c)  _sch_test(c, _sch_ispunct)
98 #define ISSPACE(c)  _sch_test(c, _sch_isspace)
99 #define ISUPPER(c)  _sch_test(c, _sch_isupper)
100 #define ISXDIGIT(c) _sch_test(c, _sch_isxdigit)
101 
102 #define ISIDNUM(c)	_sch_test(c, _sch_isidnum)
103 #define ISIDST(c)	_sch_test(c, _sch_isidst)
104 #define IS_ISOBASIC(c)	_sch_test(c, _sch_isbasic)
105 #define IS_VSPACE(c)	_sch_test(c, _sch_isvsp)
106 #define IS_NVSPACE(c)	_sch_test(c, _sch_isnvsp)
107 #define IS_SPACE_OR_NUL(c)	_sch_test(c, _sch_iscppsp)
108 
109 /* Character transformation.  */
110 extern const unsigned char  _sch_toupper[256];
111 extern const unsigned char  _sch_tolower[256];
112 #define TOUPPER(c) _sch_toupper[(c) & 0xff]
113 #define TOLOWER(c) _sch_tolower[(c) & 0xff]
114 
115 /* Prevent the users of safe-ctype.h from accidentally using the routines
116    from ctype.h.  Initially, the approach was to produce an error when
117    detecting that ctype.h has been included.  But this was causing
118    trouble as ctype.h might get indirectly included as a result of
119    including another system header (for instance gnulib's stdint.h).
120    So we include ctype.h here and then immediately redefine its macros.  */
121 
122 #if 0 /* in valgrind */
123 #include <ctype.h>
124 #endif /* ! in valgrind */
125 
126 #undef isalpha
127 #define isalpha(c) do_not_use_isalpha_with_safe_ctype
128 #undef isalnum
129 #define isalnum(c) do_not_use_isalnum_with_safe_ctype
130 #undef iscntrl
131 #define iscntrl(c) do_not_use_iscntrl_with_safe_ctype
132 #undef isdigit
133 #define isdigit(c) do_not_use_isdigit_with_safe_ctype
134 #undef isgraph
135 #define isgraph(c) do_not_use_isgraph_with_safe_ctype
136 #undef islower
137 #define islower(c) do_not_use_islower_with_safe_ctype
138 #undef isprint
139 #define isprint(c) do_not_use_isprint_with_safe_ctype
140 #undef ispunct
141 #define ispunct(c) do_not_use_ispunct_with_safe_ctype
142 #undef isspace
143 #define isspace(c) do_not_use_isspace_with_safe_ctype
144 #undef isupper
145 #define isupper(c) do_not_use_isupper_with_safe_ctype
146 #undef isxdigit
147 #define isxdigit(c) do_not_use_isxdigit_with_safe_ctype
148 #undef toupper
149 #define toupper(c) do_not_use_toupper_with_safe_ctype
150 #undef tolower
151 #define tolower(c) do_not_use_tolower_with_safe_ctype
152 
153 #endif /* SAFE_CTYPE_H */
154