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#ifndef RBIMPL_CTYPE_H /*-*-C++-*-vi:se ft=cpp:*/
#define RBIMPL_CTYPE_H
/**
* @file
* @author Ruby developers <ruby-core@ruby-lang.org>
* @copyright This file is a part of the programming language Ruby.
* Permission is hereby granted, to either redistribute and/or
* modify this file, provided that the conditions mentioned in the
* file COPYING are met. Consult the file for details.
* @warning Symbols prefixed with either `RBIMPL` or `rbimpl` are
* implementation details. Don't take them as canon. They could
* rapidly appear then vanish. The name (path) of this header file
* is also an implementation detail. Do not expect it to persist
* at the place it is now. Developers are free to move it anywhere
* anytime at will.
* @note To ruby-core: remember that this header can be possibly
* recursively included from extension libraries written in C++.
* Do not expect for instance `__VA_ARGS__` is always available.
* We assume C99 for ruby itself but we don't assume languages of
* extension libraries. They could be written in C++98.
* @brief Our own, locale independent, character handling routines.
*/
#include "ruby/internal/config.h"
#ifdef STDC_HEADERS
# include <ctype.h>
#endif
#include "ruby/internal/attr/artificial.h"
#include "ruby/internal/attr/const.h"
#include "ruby/internal/attr/constexpr.h"
#include "ruby/internal/attr/nonnull.h"
#include "ruby/internal/dllexport.h"
/**
* @name Old character classification macros
*
* What is this #ISPRINT business? Well, according to our VCS and some
* internet surfing, it appears that the initial intent of these macros were to
* mimic codes appear in common in several GNU projects. As far as @shyouhei
* detects they seem to originate GNU regex (that standalone one rather than
* Gnulib or Glibc), and at least date back to 1995.
*
* Let me lawfully quote from a GNU coreutils commit
* https://git.savannah.gnu.org/cgit/coreutils.git/commit/?id=49803907f5dbd7646184a8912c9db9b09dcd0f22
*
* > Jim Meyering writes:
* >
* > "... Some ctype macros are valid only for character codes that
* > isascii says are ASCII (SGI's IRIX-4.0.5 is one such system --when
* > using /bin/cc or gcc but without giving an ansi option). So, all
* > ctype uses should be through macros like ISPRINT... If
* > STDC_HEADERS is defined, then autoconf has verified that the ctype
* > macros don't need to be guarded with references to isascii. ...
* > Defining isascii to 1 should let any compiler worth its salt
* > eliminate the && through constant folding."
* >
* > Bruno Haible adds:
* >
* > "... Furthermore, isupper(c) etc. have an undefined result if c is
* > outside the range -1 <= c <= 255. One is tempted to write isupper(c)
* > with c being of type `char', but this is wrong if c is an 8-bit
* > character >= 128 which gets sign-extended to a negative value.
* > The macro ISUPPER protects against this as well."
*
* So the intent was to reroute old problematic systems that no longer exist.
* At the same time the problems described above no longer hurt us, because we
* decided to completely avoid using system-provided isupper etc. to reinvent
* the wheel. These macros are entirely legacy; please ignore them.
*
* But let me also put stress that GNU people are wise; they use those macros
* only inside of their own implementations and never let them be public. On
* the other hand ruby has thoughtlessly publicised them to 3rd party libraries
* since its beginning, which is a very bad idea. These macros are too easy to
* get conflicted with definitions elsewhere.
*
* New programs should stick to the `rb_` prefixed names.
*
* @note It seems we just mimic the API. We do not share their implementation
* with GPL-ed programs.
*
* @{
*/
#ifndef ISPRINT
# define ISASCII rb_isascii /**< @old{rb_isascii}*/
# define ISPRINT rb_isprint /**< @old{rb_isprint}*/
# define ISGRAPH rb_isgraph /**< @old{rb_isgraph}*/
# define ISSPACE rb_isspace /**< @old{rb_isspace}*/
# define ISUPPER rb_isupper /**< @old{rb_isupper}*/
# define ISLOWER rb_islower /**< @old{rb_islower}*/
# define ISALNUM rb_isalnum /**< @old{rb_isalnum}*/
# define ISALPHA rb_isalpha /**< @old{rb_isalpha}*/
# define ISDIGIT rb_isdigit /**< @old{rb_isdigit}*/
# define ISXDIGIT rb_isxdigit /**< @old{rb_isxdigit}*/
# define ISBLANK rb_isblank /**< @old{rb_isblank}*/
# define ISCNTRL rb_iscntrl /**< @old{rb_iscntrl}*/
# define ISPUNCT rb_ispunct /**< @old{rb_ispunct}*/
#endif
#define TOUPPER rb_toupper /**< @old{rb_toupper}*/
#define TOLOWER rb_tolower /**< @old{rb_tolower}*/
#define STRCASECMP st_locale_insensitive_strcasecmp /**< @old{st_locale_insensitive_strcasecmp}*/
#define STRNCASECMP st_locale_insensitive_strncasecmp /**< @old{st_locale_insensitive_strncasecmp}*/
#define STRTOUL ruby_strtoul /**< @old{ruby_strtoul}*/
/** @} */
RBIMPL_SYMBOL_EXPORT_BEGIN()
/** @name locale insensitive functions
* @{
*/
/* In descriptions below, `the POSIX Locale` and `the "C" locale` are tactfully
* used as to whether the described function mimics POSIX or C99. */
RBIMPL_ATTR_NONNULL(())
/**
* Our own locale-insensitive version of `strcasecmp(3)`. The "case" here
* always means that of the POSIX Locale. It doesn't depend on runtime locale
* settings.
*
* @param[in] s1 Comparison LHS.
* @param[in] s2 Comparison RHS.
* @retval -1 `s1` is "less" than `s2`.
* @retval 0 Both strings converted into lowercase would be identical.
* @retval 1 `s1` is "greater" than `s2`.
* @note Not only does this function works under the POSIX Locale, but
* also assumes its execution character set be what ruby calls an
* ASCII-compatible character set; which does not include for
* instance EBCDIC or UTF-16LE.
*/
int st_locale_insensitive_strcasecmp(const char *s1, const char *s2);
RBIMPL_ATTR_NONNULL(())
/**
* Our own locale-insensitive version of `strcnasecmp(3)`. The "case" here
* always means that of the POSIX Locale. It doesn't depend on runtime locale
* settings.
*
* @param[in] s1 Comparison LHS.
* @param[in] s2 Comparison RHS.
* @param[in] n Comparison shall stop after first `n` bytes are scanned.
* @retval -1 `s1` is "less" than `s2`.
* @retval 0 Both strings converted into lowercase would be identical.
* @retval 1 `s1` is "greater" than `s2`.
* @note Not only does this function works under the POSIX Locale, but
* also assumes its execution character set be what ruby calls an
* ASCII-compatible character set; which does not include for
* instance EBCDIC or UTF-16LE.
* @warning This function is _not_ timing safe.
*/
int st_locale_insensitive_strncasecmp(const char *s1, const char *s2, size_t n);
RBIMPL_ATTR_NONNULL((1))
/**
* Our own locale-insensitive version of `strtoul(3)`. The conversion is done
* as if the current locale is set to the "C" locale, no matter actual runtime
* locale settings.
*
* @note This is needed because `strtoul("i", 0, 36)` would return zero
* if it is locale sensitive and the current locale is `tr_TR`.
* @param[in] str String of digits, optionally preceded with whitespaces
* (ignored) and optionally `+` or `-` sign.
* @param[out] endptr NULL, or an arbitrary pointer (overwritten on return).
* @param[in] base `2` to `36` inclusive for each base, or special case
* `0` to detect the base from the contents of the string.
* @return Converted integer, casted to unsigned long.
* @post If `endptr` is not NULL, it is updated to point the first such
* byte where conversion failed.
* @note This function sets `errno` on failure.
* - `EINVAL`: Passed `base` is out of range.
* - `ERANGE`: Converted integer is out of range of `long`.
* @warning As far as @shyouhei reads ISO/IEC 9899:2018 section 7.22.1.4, a
* conforming `strtoul` implementation shall render `ERANGE`
* whenever it finds the input string represents a negative
* integer. Such thing can never be representable using `unsigned
* long`. However this implementation does not honour that
* language. It just casts such negative value to the return
* type, resulting a very big return value. This behaviour is at
* least questionable. But we can no longer change that at this
* point.
* @note Not only does this function works under the "C" locale, but
* also assumes its execution character set be what ruby calls an
* ASCII-compatible character set; which does not include for
* instance EBCDIC or UTF-16LE.
*/
unsigned long ruby_strtoul(const char *str, char **endptr, int base);
RBIMPL_SYMBOL_EXPORT_END()
/*
* We are making the functions below to return `int` instead of `bool`. They
* have been as such since their birth at 5f237d79033b2109afb768bc889611fa9630.
*/
RBIMPL_ATTR_CONST()
RBIMPL_ATTR_CONSTEXPR(CXX11)
RBIMPL_ATTR_ARTIFICIAL()
/**
* Our own locale-insensitive version of `isascii(3)`.
*
* @param[in] c Byte in question to query.
* @retval false `c` is out of range of ASCII character set.
* @retval true Yes it is.
* @warning `c` is an int. This means that when you pass a `char` value
* here, it experiences "integer promotion" as defined in ISO/IEC
* 9899:2018 section 6.3.1.1 paragraph 1.
*/
static inline int
rb_isascii(int c)
{
return '\0' <= c && c <= '\x7f';
}
RBIMPL_ATTR_CONST()
RBIMPL_ATTR_CONSTEXPR(CXX11)
RBIMPL_ATTR_ARTIFICIAL()
/**
* Our own locale-insensitive version of `isupper(3)`.
*
* @param[in] c Byte in question to query.
* @retval true `c` is listed in IEEE 1003.1 section 7.3.1.1 "upper".
* @retval false Anything else.
* @note Not only does this function works under the POSIX Locale, but
* also assumes its execution character set be what ruby calls an
* ASCII-compatible character set; which does not include for
* instance EBCDIC or UTF-16LE.
* @warning `c` is an int. This means that when you pass a `char` value
* here, it experiences "integer promotion" as defined in ISO/IEC
* 9899:2018 section 6.3.1.1 paragraph 1.
*/
static inline int
rb_isupper(int c)
{
return 'A' <= c && c <= 'Z';
}
RBIMPL_ATTR_CONST()
RBIMPL_ATTR_CONSTEXPR(CXX11)
RBIMPL_ATTR_ARTIFICIAL()
/**
* Our own locale-insensitive version of `islower(3)`.
*
* @param[in] c Byte in question to query.
* @retval true `c` is listed in IEEE 1003.1 section 7.3.1.1 "lower".
* @retval false Anything else.
* @note Not only does this function works under the POSIX Locale, but
* also assumes its execution character set be what ruby calls an
* ASCII-compatible character set; which does not include for
* instance EBCDIC or UTF-16LE.
* @warning `c` is an int. This means that when you pass a `char` value
* here, it experiences "integer promotion" as defined in ISO/IEC
* 9899:2018 section 6.3.1.1 paragraph 1.
*/
static inline int
rb_islower(int c)
{
return 'a' <= c && c <= 'z';
}
RBIMPL_ATTR_CONST()
RBIMPL_ATTR_CONSTEXPR(CXX11)
RBIMPL_ATTR_ARTIFICIAL()
/**
* Our own locale-insensitive version of `isalpha(3)`.
*
* @param[in] c Byte in question to query.
* @retval true `c` is listed in either IEEE 1003.1 section 7.3.1.1
* "upper" or "lower".
* @retval false Anything else.
* @note Not only does this function works under the POSIX Locale, but
* also assumes its execution character set be what ruby calls an
* ASCII-compatible character set; which does not include for
* instance EBCDIC or UTF-16LE.
* @warning `c` is an int. This means that when you pass a `char` value
* here, it experiences "integer promotion" as defined in ISO/IEC
* 9899:2018 section 6.3.1.1 paragraph 1.
*/
static inline int
rb_isalpha(int c)
{
return rb_isupper(c) || rb_islower(c);
}
RBIMPL_ATTR_CONST()
RBIMPL_ATTR_CONSTEXPR(CXX11)
RBIMPL_ATTR_ARTIFICIAL()
/**
* Our own locale-insensitive version of `isdigit(3)`.
*
* @param[in] c Byte in question to query.
* @retval true `c` is listed in IEEE 1003.1 section 7.3.1.1 "digit".
* @retval false Anything else.
* @note Not only does this function works under the POSIX Locale, but
* also assumes its execution character set be what ruby calls an
* ASCII-compatible character set; which does not include for
* instance EBCDIC or UTF-16LE.
* @warning `c` is an int. This means that when you pass a `char` value
* here, it experiences "integer promotion" as defined in ISO/IEC
* 9899:2018 section 6.3.1.1 paragraph 1.
*/
static inline int
rb_isdigit(int c)
{
return '0' <= c && c <= '9';
}
RBIMPL_ATTR_CONST()
RBIMPL_ATTR_CONSTEXPR(CXX11)
RBIMPL_ATTR_ARTIFICIAL()
/**
* Our own locale-insensitive version of `isalnum(3)`.
*
* @param[in] c Byte in question to query.
* @retval true `c` is listed in either IEEE 1003.1 section 7.3.1.1
* "upper", "lower", or "digit".
* @retval false Anything else.
* @note Not only does this function works under the POSIX Locale, but
* also assumes its execution character set be what ruby calls an
* ASCII-compatible character set; which does not include for
* instance EBCDIC or UTF-16LE.
* @warning `c` is an int. This means that when you pass a `char` value
* here, it experiences "integer promotion" as defined in ISO/IEC
* 9899:2018 section 6.3.1.1 paragraph 1.
*/
static inline int
rb_isalnum(int c)
{
return rb_isalpha(c) || rb_isdigit(c);
}
RBIMPL_ATTR_CONST()
RBIMPL_ATTR_CONSTEXPR(CXX11)
RBIMPL_ATTR_ARTIFICIAL()
/**
* Our own locale-insensitive version of `isxdigit(3)`.
*
* @param[in] c Byte in question to query.
* @retval true `c` is listed in IEEE 1003.1 section 7.3.1.1 "xdigit".
* @retval false Anything else.
* @note Not only does this function works under the POSIX Locale, but
* also assumes its execution character set be what ruby calls an
* ASCII-compatible character set; which does not include for
* instance EBCDIC or UTF-16LE.
* @warning `c` is an int. This means that when you pass a `char` value
* here, it experiences "integer promotion" as defined in ISO/IEC
* 9899:2018 section 6.3.1.1 paragraph 1.
*/
static inline int
rb_isxdigit(int c)
{
return rb_isdigit(c) || ('A' <= c && c <= 'F') || ('a' <= c && c <= 'f');
}
RBIMPL_ATTR_CONST()
RBIMPL_ATTR_CONSTEXPR(CXX11)
RBIMPL_ATTR_ARTIFICIAL()
/**
* Our own locale-insensitive version of `isblank(3)`.
*
* @param[in] c Byte in question to query.
* @retval true `c` is listed in IEEE 1003.1 section 7.3.1.1 "blank".
* @retval false Anything else.
* @note Not only does this function works under the POSIX Locale, but
* also assumes its execution character set be what ruby calls an
* ASCII-compatible character set; which does not include for
* instance EBCDIC or UTF-16LE.
* @warning `c` is an int. This means that when you pass a `char` value
* here, it experiences "integer promotion" as defined in ISO/IEC
* 9899:2018 section 6.3.1.1 paragraph 1.
*/
static inline int
rb_isblank(int c)
{
return c == ' ' || c == '\t';
}
RBIMPL_ATTR_CONST()
RBIMPL_ATTR_CONSTEXPR(CXX11)
RBIMPL_ATTR_ARTIFICIAL()
/**
* Our own locale-insensitive version of `isspace(3)`.
*
* @param[in] c Byte in question to query.
* @retval true `c` is listed in IEEE 1003.1 section 7.3.1.1 "space".
* @retval false Anything else.
* @note Not only does this function works under the POSIX Locale, but
* also assumes its execution character set be what ruby calls an
* ASCII-compatible character set; which does not include for
* instance EBCDIC or UTF-16LE.
* @warning `c` is an int. This means that when you pass a `char` value
* here, it experiences "integer promotion" as defined in ISO/IEC
* 9899:2018 section 6.3.1.1 paragraph 1.
*/
static inline int
rb_isspace(int c)
{
return c == ' ' || ('\t' <= c && c <= '\r');
}
RBIMPL_ATTR_CONST()
RBIMPL_ATTR_CONSTEXPR(CXX11)
RBIMPL_ATTR_ARTIFICIAL()
/**
* Our own locale-insensitive version of `iscntrl(3)`.
*
* @param[in] c Byte in question to query.
* @retval true `c` is listed in IEEE 1003.1 section 7.3.1.1 "cntrl".
* @retval false Anything else.
* @note Not only does this function works under the POSIX Locale, but
* also assumes its execution character set be what ruby calls an
* ASCII-compatible character set; which does not include for
* instance EBCDIC or UTF-16LE.
* @warning `c` is an int. This means that when you pass a `char` value
* here, it experiences "integer promotion" as defined in ISO/IEC
* 9899:2018 section 6.3.1.1 paragraph 1.
*/
static inline int
rb_iscntrl(int c)
{
return ('\0' <= c && c < ' ') || c == '\x7f';
}
RBIMPL_ATTR_CONST()
RBIMPL_ATTR_CONSTEXPR(CXX11)
RBIMPL_ATTR_ARTIFICIAL()
/**
* Identical to rb_isgraph(), except it also returns true for `' '`.
*
* @param[in] c Byte in question to query.
* @retval true `c` is listed in either IEEE 1003.1 section 7.3.1.1
* "upper", "lower", "digit", "punct", or a `' '`.
* @retval false Anything else.
* @note Not only does this function works under the POSIX Locale, but
* also assumes its execution character set be what ruby calls an
* ASCII-compatible character set; which does not include for
* instance EBCDIC or UTF-16LE.
* @warning `c` is an int. This means that when you pass a `char` value
* here, it experiences "integer promotion" as defined in ISO/IEC
* 9899:2018 section 6.3.1.1 paragraph 1.
*/
static inline int
rb_isprint(int c)
{
return ' ' <= c && c <= '\x7e';
}
RBIMPL_ATTR_CONST()
RBIMPL_ATTR_CONSTEXPR(CXX11)
RBIMPL_ATTR_ARTIFICIAL()
/**
* Our own locale-insensitive version of `ispunct(3)`.
*
* @param[in] c Byte in question to query.
* @retval true `c` is listed in IEEE 1003.1 section 7.3.1.1 "punct".
* @retval false Anything else.
* @note Not only does this function works under the POSIX Locale, but
* also assumes its execution character set be what ruby calls an
* ASCII-compatible character set; which does not include for
* instance EBCDIC or UTF-16LE.
* @warning `c` is an int. This means that when you pass a `char` value
* here, it experiences "integer promotion" as defined in ISO/IEC
* 9899:2018 section 6.3.1.1 paragraph 1.
*/
static inline int
rb_ispunct(int c)
{
return !rb_isalnum(c);
}
RBIMPL_ATTR_CONST()
RBIMPL_ATTR_CONSTEXPR(CXX11)
RBIMPL_ATTR_ARTIFICIAL()
/**
* Our own locale-insensitive version of `isgraph(3)`.
*
* @param[in] c Byte in question to query.
* @retval true `c` is listed in either IEEE 1003.1 section 7.3.1.1
* "upper", "lower", "digit", or "punct".
* @retval false Anything else.
* @note Not only does this function works under the POSIX Locale, but
* also assumes its execution character set be what ruby calls an
* ASCII-compatible character set; which does not include for
* instance EBCDIC or UTF-16LE.
* @warning `c` is an int. This means that when you pass a `char` value
* here, it experiences "integer promotion" as defined in ISO/IEC
* 9899:2018 section 6.3.1.1 paragraph 1.
*/
static inline int
rb_isgraph(int c)
{
return '!' <= c && c <= '\x7e';
}
RBIMPL_ATTR_CONST()
RBIMPL_ATTR_CONSTEXPR(CXX11)
RBIMPL_ATTR_ARTIFICIAL()
/**
* Our own locale-insensitive version of `tolower(3)`.
*
* @param[in] c Byte in question to convert.
* @retval c The byte is not listed in in IEEE 1003.1 section
* 7.3.1.1 "upper".
* @retval otherwise Byte converted using the map defined in IEEE 1003.1
* section 7.3.1 "tolower".
* @note Not only does this function works under the POSIX Locale, but
* also assumes its execution character set be what ruby calls an
* ASCII-compatible character set; which does not include for
* instance EBCDIC or UTF-16LE.
* @warning `c` is an int. This means that when you pass a `char` value
* here, it experiences "integer promotion" as defined in ISO/IEC
* 9899:2018 section 6.3.1.1 paragraph 1.
*/
static inline int
rb_tolower(int c)
{
return rb_isupper(c) ? (c|0x20) : c;
}
RBIMPL_ATTR_CONST()
RBIMPL_ATTR_CONSTEXPR(CXX11)
RBIMPL_ATTR_ARTIFICIAL()
/**
* Our own locale-insensitive version of `toupper(3)`.
*
* @param[in] c Byte in question to convert.
* @retval c The byte is not listed in in IEEE 1003.1 section
* 7.3.1.1 "lower".
* @retval otherwise Byte converted using the map defined in IEEE 1003.1
* section 7.3.1 "toupper".
* @note Not only does this function works under the POSIX Locale, but
* also assumes its execution character set be what ruby calls an
* ASCII-compatible character set; which does not include for
* instance EBCDIC or UTF-16LE.
* @warning `c` is an int. This means that when you pass a `char` value
* here, it experiences "integer promotion" as defined in ISO/IEC
* 9899:2018 section 6.3.1.1 paragraph 1.
*/
static inline int
rb_toupper(int c)
{
return rb_islower(c) ? (c&0x5f) : c;
}
/** @} */
#endif /* RBIMPL_CTYPE_H */
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