151 lines
5.5 KiB
C
151 lines
5.5 KiB
C
/* <ctype.h> replacement macros.
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Copyright (C) 2000-2022 Free Software Foundation, Inc.
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Contributed by Zack Weinberg <zackw@stanford.edu>.
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This file is part of the libiberty library.
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Libiberty is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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Libiberty is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with libiberty; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
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Boston, MA 02110-1301, USA. */
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/* This is a compatible replacement of the standard C library's <ctype.h>
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with the following properties:
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- Implements all isxxx() macros required by C99.
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- Also implements some character classes useful when
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parsing C-like languages.
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- Does not change behavior depending on the current locale.
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- Behaves properly for all values in the range of a signed or
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unsigned char.
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To avoid conflicts, this header defines the isxxx functions in upper
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case, e.g. ISALPHA not isalpha. */
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#ifndef SAFE_CTYPE_H
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#define SAFE_CTYPE_H
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/* Determine host character set. */
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#define HOST_CHARSET_UNKNOWN 0
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#define HOST_CHARSET_ASCII 1
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#define HOST_CHARSET_EBCDIC 2
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#if '\n' == 0x0A && ' ' == 0x20 && '0' == 0x30 \
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&& 'A' == 0x41 && 'a' == 0x61 && '!' == 0x21
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# define HOST_CHARSET HOST_CHARSET_ASCII
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#else
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# if '\n' == 0x15 && ' ' == 0x40 && '0' == 0xF0 \
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&& 'A' == 0xC1 && 'a' == 0x81 && '!' == 0x5A
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# define HOST_CHARSET HOST_CHARSET_EBCDIC
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# else
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# define HOST_CHARSET HOST_CHARSET_UNKNOWN
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# endif
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#endif
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/* Categories. */
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enum {
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/* In C99 */
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_sch_isblank = 0x0001, /* space \t */
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_sch_iscntrl = 0x0002, /* nonprinting characters */
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_sch_isdigit = 0x0004, /* 0-9 */
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_sch_islower = 0x0008, /* a-z */
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_sch_isprint = 0x0010, /* any printing character including ' ' */
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_sch_ispunct = 0x0020, /* all punctuation */
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_sch_isspace = 0x0040, /* space \t \n \r \f \v */
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_sch_isupper = 0x0080, /* A-Z */
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_sch_isxdigit = 0x0100, /* 0-9A-Fa-f */
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/* Extra categories useful to cpplib. */
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_sch_isidst = 0x0200, /* A-Za-z_ */
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_sch_isvsp = 0x0400, /* \n \r */
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_sch_isnvsp = 0x0800, /* space \t \f \v \0 */
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/* Combinations of the above. */
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_sch_isalpha = _sch_isupper|_sch_islower, /* A-Za-z */
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_sch_isalnum = _sch_isalpha|_sch_isdigit, /* A-Za-z0-9 */
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_sch_isidnum = _sch_isidst|_sch_isdigit, /* A-Za-z0-9_ */
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_sch_isgraph = _sch_isalnum|_sch_ispunct, /* isprint and not space */
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_sch_iscppsp = _sch_isvsp|_sch_isnvsp, /* isspace + \0 */
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_sch_isbasic = _sch_isprint|_sch_iscppsp /* basic charset of ISO C
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(plus ` and @) */
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};
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/* Character classification. */
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extern const unsigned short _sch_istable[256];
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#define _sch_test(c, bit) (_sch_istable[(c) & 0xff] & (unsigned short)(bit))
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#define ISALPHA(c) _sch_test(c, _sch_isalpha)
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#define ISALNUM(c) _sch_test(c, _sch_isalnum)
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#define ISBLANK(c) _sch_test(c, _sch_isblank)
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#define ISCNTRL(c) _sch_test(c, _sch_iscntrl)
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#define ISDIGIT(c) _sch_test(c, _sch_isdigit)
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#define ISGRAPH(c) _sch_test(c, _sch_isgraph)
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#define ISLOWER(c) _sch_test(c, _sch_islower)
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#define ISPRINT(c) _sch_test(c, _sch_isprint)
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#define ISPUNCT(c) _sch_test(c, _sch_ispunct)
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#define ISSPACE(c) _sch_test(c, _sch_isspace)
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#define ISUPPER(c) _sch_test(c, _sch_isupper)
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#define ISXDIGIT(c) _sch_test(c, _sch_isxdigit)
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#define ISIDNUM(c) _sch_test(c, _sch_isidnum)
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#define ISIDST(c) _sch_test(c, _sch_isidst)
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#define IS_ISOBASIC(c) _sch_test(c, _sch_isbasic)
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#define IS_VSPACE(c) _sch_test(c, _sch_isvsp)
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#define IS_NVSPACE(c) _sch_test(c, _sch_isnvsp)
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#define IS_SPACE_OR_NUL(c) _sch_test(c, _sch_iscppsp)
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/* Character transformation. */
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extern const unsigned char _sch_toupper[256];
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extern const unsigned char _sch_tolower[256];
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#define TOUPPER(c) _sch_toupper[(c) & 0xff]
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#define TOLOWER(c) _sch_tolower[(c) & 0xff]
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/* Prevent the users of safe-ctype.h from accidently using the routines
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from ctype.h. Initially, the approach was to produce an error when
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detecting that ctype.h has been included. But this was causing
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trouble as ctype.h might get indirectly included as a result of
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including another system header (for instance gnulib's stdint.h).
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So we include ctype.h here and then immediately redefine its macros. */
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#include <ctype.h>
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#undef isalpha
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#define isalpha(c) do_not_use_isalpha_with_safe_ctype
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#undef isalnum
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#define isalnum(c) do_not_use_isalnum_with_safe_ctype
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#undef iscntrl
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#define iscntrl(c) do_not_use_iscntrl_with_safe_ctype
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#undef isdigit
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#define isdigit(c) do_not_use_isdigit_with_safe_ctype
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#undef isgraph
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#define isgraph(c) do_not_use_isgraph_with_safe_ctype
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#undef islower
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#define islower(c) do_not_use_islower_with_safe_ctype
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#undef isprint
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#define isprint(c) do_not_use_isprint_with_safe_ctype
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#undef ispunct
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#define ispunct(c) do_not_use_ispunct_with_safe_ctype
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#undef isspace
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#define isspace(c) do_not_use_isspace_with_safe_ctype
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#undef isupper
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#define isupper(c) do_not_use_isupper_with_safe_ctype
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#undef isxdigit
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#define isxdigit(c) do_not_use_isxdigit_with_safe_ctype
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#undef toupper
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#define toupper(c) do_not_use_toupper_with_safe_ctype
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#undef tolower
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#define tolower(c) do_not_use_tolower_with_safe_ctype
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#endif /* SAFE_CTYPE_H */
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