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util-linux/include/cctype.h

325 lines
8.5 KiB

/**
* Character handling in C locale.
*
* This file is based on gnulib c-ctype.h-dd7a871 with the
* other gnulib dependencies removed for use in util-linux.
*
* These functions work like the corresponding functions in <ctype.h>,
* except that they have the C (POSIX) locale hardwired, whereas the
* <ctype.h> functions' behaviour depends on the current locale set via
* setlocale.
*
* Copyright (C) 2000-2003, 2006, 2008-2017 Free Software Foundation, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef UTIL_LINUX_CCTYPE_H
#define UTIL_LINUX_CCTYPE_H
/**
* The functions defined in this file assume the "C" locale and a character
* set without diacritics (ASCII-US or EBCDIC-US or something like that).
* Even if the "C" locale on a particular system is an extension of the ASCII
* character set (like on BeOS, where it is UTF-8, or on AmigaOS, where it
* is ISO-8859-1), the functions in this file recognize only the ASCII
* characters.
*/
#if (' ' == 32) && ('!' == 33) && ('"' == 34) && ('#' == 35) \
&& ('%' == 37) && ('&' == 38) && ('\'' == 39) && ('(' == 40) \
&& (')' == 41) && ('*' == 42) && ('+' == 43) && (',' == 44) \
&& ('-' == 45) && ('.' == 46) && ('/' == 47) && ('0' == 48) \
&& ('1' == 49) && ('2' == 50) && ('3' == 51) && ('4' == 52) \
&& ('5' == 53) && ('6' == 54) && ('7' == 55) && ('8' == 56) \
&& ('9' == 57) && (':' == 58) && (';' == 59) && ('<' == 60) \
&& ('=' == 61) && ('>' == 62) && ('?' == 63) && ('A' == 65) \
&& ('B' == 66) && ('C' == 67) && ('D' == 68) && ('E' == 69) \
&& ('F' == 70) && ('G' == 71) && ('H' == 72) && ('I' == 73) \
&& ('J' == 74) && ('K' == 75) && ('L' == 76) && ('M' == 77) \
&& ('N' == 78) && ('O' == 79) && ('P' == 80) && ('Q' == 81) \
&& ('R' == 82) && ('S' == 83) && ('T' == 84) && ('U' == 85) \
&& ('V' == 86) && ('W' == 87) && ('X' == 88) && ('Y' == 89) \
&& ('Z' == 90) && ('[' == 91) && ('\\' == 92) && (']' == 93) \
&& ('^' == 94) && ('_' == 95) && ('a' == 97) && ('b' == 98) \
&& ('c' == 99) && ('d' == 100) && ('e' == 101) && ('f' == 102) \
&& ('g' == 103) && ('h' == 104) && ('i' == 105) && ('j' == 106) \
&& ('k' == 107) && ('l' == 108) && ('m' == 109) && ('n' == 110) \
&& ('o' == 111) && ('p' == 112) && ('q' == 113) && ('r' == 114) \
&& ('s' == 115) && ('t' == 116) && ('u' == 117) && ('v' == 118) \
&& ('w' == 119) && ('x' == 120) && ('y' == 121) && ('z' == 122) \
&& ('{' == 123) && ('|' == 124) && ('}' == 125) && ('~' == 126)
/*
* The character set is ASCII or one of its variants or extensions, not EBCDIC.
* Testing the value of '\n' and '\r' is not relevant.
*/
# define C_CTYPE_ASCII 1
#elif ! (' ' == '\x40' && '0' == '\xf0' \
&& 'A' == '\xc1' && 'J' == '\xd1' && 'S' == '\xe2' \
&& 'a' == '\x81' && 'j' == '\x91' && 's' == '\xa2')
# error "Only ASCII and EBCDIC are supported"
#endif
#if 'A' < 0
# error "EBCDIC and char is signed -- not supported"
#endif
/* Cases for control characters. */
#define _C_CTYPE_CNTRL \
case '\a': case '\b': case '\f': case '\n': \
case '\r': case '\t': case '\v': \
_C_CTYPE_OTHER_CNTRL
/* ASCII control characters other than those with \-letter escapes. */
#if C_CTYPE_ASCII
# define _C_CTYPE_OTHER_CNTRL \
case '\x00': case '\x01': case '\x02': case '\x03': \
case '\x04': case '\x05': case '\x06': case '\x0e': \
case '\x0f': case '\x10': case '\x11': case '\x12': \
case '\x13': case '\x14': case '\x15': case '\x16': \
case '\x17': case '\x18': case '\x19': case '\x1a': \
case '\x1b': case '\x1c': case '\x1d': case '\x1e': \
case '\x1f': case '\x7f'
#else
/*
* Use EBCDIC code page 1047's assignments for ASCII control chars;
* assume all EBCDIC code pages agree about these assignments.
*/
# define _C_CTYPE_OTHER_CNTRL \
case '\x00': case '\x01': case '\x02': case '\x03': \
case '\x07': case '\x0e': case '\x0f': case '\x10': \
case '\x11': case '\x12': case '\x13': case '\x18': \
case '\x19': case '\x1c': case '\x1d': case '\x1e': \
case '\x1f': case '\x26': case '\x27': case '\x2d': \
case '\x2e': case '\x32': case '\x37': case '\x3c': \
case '\x3d': case '\x3f'
#endif
/* Cases for lowercase hex letters, and lowercase letters, all offset by N. */
#define _C_CTYPE_LOWER_A_THRU_F_N(N) \
case 'a' + (N): case 'b' + (N): case 'c' + (N): case 'd' + (N): \
case 'e' + (N): case 'f' + (N)
#define _C_CTYPE_LOWER_N(N) \
_C_CTYPE_LOWER_A_THRU_F_N(N): \
case 'g' + (N): case 'h' + (N): case 'i' + (N): case 'j' + (N): \
case 'k' + (N): case 'l' + (N): case 'm' + (N): case 'n' + (N): \
case 'o' + (N): case 'p' + (N): case 'q' + (N): case 'r' + (N): \
case 's' + (N): case 't' + (N): case 'u' + (N): case 'v' + (N): \
case 'w' + (N): case 'x' + (N): case 'y' + (N): case 'z' + (N)
/* Cases for hex letters, digits, lower, punct, and upper. */
#define _C_CTYPE_A_THRU_F \
_C_CTYPE_LOWER_A_THRU_F_N (0): \
_C_CTYPE_LOWER_A_THRU_F_N ('A' - 'a')
#define _C_CTYPE_DIGIT \
case '0': case '1': case '2': case '3': \
case '4': case '5': case '6': case '7': \
case '8': case '9'
#define _C_CTYPE_LOWER _C_CTYPE_LOWER_N (0)
#define _C_CTYPE_PUNCT \
case '!': case '"': case '#': case '$': \
case '%': case '&': case '\'': case '(': \
case ')': case '*': case '+': case ',': \
case '-': case '.': case '/': case ':': \
case ';': case '<': case '=': case '>': \
case '?': case '@': case '[': case '\\': \
case ']': case '^': case '_': case '`': \
case '{': case '|': case '}': case '~'
#define _C_CTYPE_UPPER _C_CTYPE_LOWER_N ('A' - 'a')
/**
* Function definitions.
*
* Unlike the functions in <ctype.h>, which require an argument in the range
* of the 'unsigned char' type, the functions here operate on values that are
* in the 'unsigned char' range or in the 'char' range. In other words,
* when you have a 'char' value, you need to cast it before using it as
* argument to a <ctype.h> function:
*
* const char *s = ...;
* if (isalpha ((unsigned char) *s)) ...
*
* but you don't need to cast it for the functions defined in this file:
*
* const char *s = ...;
* if (c_isalpha (*s)) ...
*/
static inline int c_isalnum (int c)
{
switch (c) {
_C_CTYPE_DIGIT:
_C_CTYPE_LOWER:
_C_CTYPE_UPPER:
return 1;
default:
return 0;
}
}
static inline int c_isalpha (int c)
{
switch (c) {
_C_CTYPE_LOWER:
_C_CTYPE_UPPER:
return 1;
default:
return 0;
}
}
/* The function isascii is not locale dependent.
* Its use in EBCDIC is questionable.
*/
static inline int c_isascii (int c)
{
switch (c) {
case ' ':
_C_CTYPE_CNTRL:
_C_CTYPE_DIGIT:
_C_CTYPE_LOWER:
_C_CTYPE_PUNCT:
_C_CTYPE_UPPER:
return 1;
default:
return 0;
}
}
static inline int c_isblank (int c)
{
return c == ' ' || c == '\t';
}
static inline int c_iscntrl (int c)
{
switch (c) {
_C_CTYPE_CNTRL:
return 1;
default:
return 0;
}
}
static inline int c_isdigit (int c)
{
switch (c) {
_C_CTYPE_DIGIT:
return 1;
default:
return 0;
}
}
static inline int c_isgraph (int c)
{
switch (c) {
_C_CTYPE_DIGIT:
_C_CTYPE_LOWER:
_C_CTYPE_PUNCT:
_C_CTYPE_UPPER:
return 1;
default:
return 0;
}
}
static inline int c_islower (int c)
{
switch (c) {
_C_CTYPE_LOWER:
return 1;
default:
return 0;
}
}
static inline int c_isprint (int c)
{
switch (c) {
case ' ':
_C_CTYPE_DIGIT:
_C_CTYPE_LOWER:
_C_CTYPE_PUNCT:
_C_CTYPE_UPPER:
return 1;
default:
return 0;
}
}
static inline int c_ispunct (int c)
{
switch (c) {
_C_CTYPE_PUNCT:
return 1;
default:
return 0;
}
}
static inline int c_isspace (int c)
{
switch (c) {
case ' ': case '\t': case '\n': case '\v': case '\f': case '\r':
return 1;
default:
return 0;
}
}
static inline int c_isupper (int c)
{
switch (c) {
_C_CTYPE_UPPER:
return 1;
default:
return 0;
}
}
static inline int c_isxdigit (int c)
{
switch (c) {
_C_CTYPE_DIGIT:
_C_CTYPE_A_THRU_F:
return 1;
default:
return 0;
}
}
static inline int c_tolower (int c)
{
switch (c) {
_C_CTYPE_UPPER:
return c - 'A' + 'a';
default:
return c;
}
}
static inline int c_toupper (int c)
{
switch (c) {
_C_CTYPE_LOWER:
return c - 'a' + 'A';
default:
return c;
}
}
#endif /* UTIL_LINUX_CCTYPE_H */