add ctype.h: add ASCII character type testers, that do not take locale

Signed-off-by: Mattias Andrée <maandree@operamail.com>

1 files changed, 269 insertions, 0 deletions

diff --git a/include/ctype.h b/include/ctype.h
new file mode 100644
index 0000000..a76f384
--- /dev/null
+++ b/include/ctype.h
@@ -0,0 +1,269 @@
+/**
+ * slibc — Yet another C library
+ * Copyright © 2015  Mattias Andrée (maandree@member.fsf.org)
+ * 
+ * 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 3 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 _CTYPE_H
+#define _CTYPE_H
+#include <slibc/version.h>
+
+#ifndef _SLIBC_SUPPRESS_WARNINGS
+# warning "Functions in <ctype.h>, 'isascii' and 'toascii', only support ASCII."
+# warning "Functions in <ctype.h>, do not support wider characets than 8 bits."
+#endif
+
+
+#include <slibc/features.h>
+
+
+
+/**
+ * Check whether a character is an alphabetical
+ * character or a decimal digit.
+ * 
+ * @param   c  The character.
+ * @return     Whether the character is in
+ *             ['0', '9'], ['A', 'Z'], or ['a', 'z'].
+ */
+int (isalnum)(int);  /* [0x30, 0x39], [0x41, 0x5A], [0x61, 0x7A] */
+#if defined (__GNUC__)
+# define isalnum(c)  \
+  ({ int __c = (c); (isalpha(__c) || isdigit(__c)); })
+#endif
+
+
+/**
+ * Check whether a character is an alphabetical character.
+ * 
+ * @param   c  The character.
+ * @return     Whether the character is in
+ *             ['A', 'Z'] or ['a', 'z'].
+ */
+int (isalpha)(int);  /* [0x41, 0x5A], [0x61, 0x7A] */
+#define isalpha(c)  (islower(tolower(a)))
+
+
+#ifdef _GNU_SOURCE
+/**
+ * Check whether a character is a regular blank space
+ * or a horizontal tabulation.
+ * 
+ * This is a GNU extension.
+ * 
+ * @param   c  The character.
+ * @return     Whether the character is a ' ' or a '\t'.
+ */
+int (isblank)(int); /* ' ', '\t' */
+# if defined(__GNUC__)
+#  define isblank(c)  \
+  ({ int __c = (c); ((__c == ' ') || (__c == '\t')); })
+# endif
+#endif
+
+
+/**
+ * Check whether a character is a non-printable
+ * ASCII character.
+ * 
+ * @param   c  The character.
+ * @return     Whether the character is lower than ' ',
+ *             or is 0x7F.
+ */
+int (iscntrl)(int);  /* [0x00, 0x1F], 0x7F */
+#if defined(__GNUC__)
+# define iscntrl(c)  \
+  ({ int __c = (c); (((unsigned)__c < ' ') || (c__ == 0x7F)); })
+#endif
+
+
+/**
+ * Check whether a character is a decimal digit.
+ * 
+ * @param   c  The character.
+ * @return     Whether the character is in ['0', '9'].
+ */
+int (isdigit)(int);  /* [0x30, 0x39] */
+#define isdigit(c)  ((unsigned)((c) - '0') < 10)
+
+
+/**
+ * Check whether a character is has a printable glyph.
+ * 
+ * @param   c  The character.
+ * @return     Whether the character is greater
+ *             than ' ', but is not 0x7F.
+ */
+int (isgraph)(int);  /* [0x21, 0x7E] */
+#define isgraph(c)  ((unsigned)(c - 0x21) < 0x5E)
+
+
+/**
+ * Check whether a character is a lowercase
+ * alphabetical character.
+ * 
+ * @param   c  The character.
+ * @return     Whether the character is in ['a', 'z'].
+ */
+int (islower)(int);  /* [0x61, 0x7A] */
+#define islower(c)  ((unsigned)((c) - 'a') < 26)
+
+
+/**
+ * Check whether a character is has a printable glyph
+ * or a blank space.
+ * 
+ * @param   c  The character.
+ * @return     Whether the character is at least
+ *             as great as ' ', but is not 0x7F.
+ */
+int (isprint)(int);  /* [0x20, 0x7E] */
+#define isprint(c)  ((unsigned)(c - 0x20) < 0x5F)
+
+
+/**
+ * Check whether a character is has a punctuation,
+ * that is, a printable character but a blank space,
+ * numerical or alphabetical.
+ * 
+ * @param   c  The character.
+ * @return     Whether the character is a punctuation.
+ */
+int (ispunct)(int);  /* isprint && !isalnum && !isspace) */
+#if defined (__GNUC__)
+# define ispunk(c)  \
+  ({ int __c = (c); (isprint(__c) && !isalnum(__c) && !isspace(__c)); })
+#endif
+
+
+/**
+ * Check whether a character is a whitespace character.
+ * 
+ * @param   c  The character.
+ * @return     Whether the character is a ' ', '\f',
+ *             '\n', '\r', '\t', or '\v'.
+ */
+int (isspace)(int);  /* 0x20, [0x09, 0x0D] */
+#if defined (__GNUC__)
+# define isspace(c)  \
+  ({ int __c = (c); ((__c == ' ') || ((unsigned)(__c - '\t') < 5)); })
+#endif
+
+
+/**
+ * Check whether a character is an uppercase
+ * alphabetical character.
+ * 
+ * @param   c  The character.
+ * @return     Whether the character is in ['A', 'Z'].
+ */
+int (isupper)(int);  /* [0x41, 0x5A] */
+#define isupper(c)  ((unsigned)((c) - 'A') < 26)
+
+
+/**
+ * Check whether a character is an ASCII
+ * hexadecimal digit. Both uppercase and
+ * lowercase is supported.
+ * 
+ * @param   c  The character.
+ * @return     Whether the character is in
+ *             ['0', '9'], ['A', 'Z'], or ['a', 'z'].
+ */
+int (isxdigit)(int);  /* [0x30, 0x39], [0x41, 0x46], [0x61, 0x66] */
+#if defined (__GNUC__)
+# define isxdigit(c)  \
+  ({ int __c = (c); (isdigit(__c) && (tolower(__c) - 'a' < 6)); })
+#endif
+
+
+
+/**
+ * Convert a uppercase ASCII character to
+ * an lowercase ASCII character.
+ * 
+ * The function's behaviour is unspecifed
+ * of the character is not alphabetical.
+ * You should consider running
+ * `(isupper(c) ? tolower(c) : c)` instead.
+ * 
+ * @param   c  The character.
+ * @return     The character in lowercase.
+ *             Guaranteed to be unchanged if the
+ *             character already is in lowercase.
+ */
+int (tolower)(int);  /* [0x41, 0x5A] -> [0x61, 0x7A] */
+#define tolower(c)  ((c) | 0x20)
+
+/**
+ * Convert a lowercase ASCII character to
+ * an uppercase ASCII character.
+ * 
+ * The function's behaviour is unspecifed
+ * of the character is not alphabetical.
+ * You should consider running
+ * `(isupper(c) ? tolower(c) : c)` instead.
+ * 
+ * @param   c  The character.
+ * @return     The character in uppercase.
+ *             Guaranteed to be unchanged if the
+ *             character already is in lowercase.
+ */
+int (toupper)(int);  /* [0x61, 0x7A] -> [0x41, 0x5A] */
+#define toupper(c)  ((c) & ~0x20)
+
+
+
+/**
+ * Check whether a character is an ASCII character.
+ * 
+ * @param   c  The character
+ * @return  -  Whether the character is an ASCII character.
+ */
+int (isascii)(int);  /* [0x00, 0x7E] */
+#define isascii(c)  ((unsigned)(c) < 0x7F)
+
+/**
+ * Remove the 8:th bit from a character.
+ * 
+ * Note that this does not make a proper character set
+ * convertion and the result is virtually arbitrary.
+ * 
+ * @param  c  The character.
+ * @param  c  The character with the 8:th bit cleared.
+ */
+int (toascii)(int)
+  __warning("Using 'toascii' is, generally, unwise.");
+#if defined(_SLIBC_SUPPRESS_WARNINGS)
+# define toascii(c)  ((c) & 0x7F)
+#endif
+
+/**
+ * This function is identical to `tolower`.
+ * It is provided for backwards-compatibility with SVID.
+ */
+int _tolower(int)
+  __deprecated("Use 'tolower' instead.");
+
+/**
+ * This function is identical to `tolower`.
+ * It is provided for backwards-compatibility with SVID.
+ */
+int _toupper(int)
+  __deprecated("Use 'toupper' instead.");
+
+
+
+#endif
+