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

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

1 files changed, 268 insertions, 0 deletions

diff --git a/src/ctype.c b/src/ctype.c
new file mode 100644
index 0000000..522a799
--- /dev/null
+++ b/src/ctype.c
@@ -0,0 +1,268 @@
+/**
+ * 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/>.
+ */
+#include <ctype.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 c)
+{
+  return isalnum(c);
+}
+
+
+/**
+ * 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 c)
+{
+  return isalpha(c);
+}
+
+
+/**
+ * Check whether a character is a regular blank space
+ * or a horizontal tabulation.
+ * 
+ * @param   c  The character.
+ * @return     Whether the character is a ' ' or a '\t'.
+ */
+int (isblank)(int c)
+{
+  return isblank(c);
+}
+
+
+/**
+ * Check whether a character is a non-printable
+ * ASCII character.
+ * 
+ * @param   c  The character.
+ * @return     Whether the character is lower than ' '.
+ */
+int (iscntrl)(int c)
+{
+  return iscntrl(c);
+}
+
+
+/**
+ * Check whether a character is a decimal digit.
+ * 
+ * @param   c  The character.
+ * @return     Whether the character is in ['0', '9'].
+ */
+int (isdigit)(int c)
+{
+  return isdigit(c);
+}
+
+
+/**
+ * Check whether a character is has a printable glyph.
+ * 
+ * @param   c  The character.
+ * @return     Whether the character is greater than ' '.
+ */
+int (isgraph)(int c)
+{
+  return isgraph(c);
+}
+
+
+/**
+ * Check whether a character is a lowercase
+ * alphabetical character.
+ * 
+ * @param   c  The character.
+ * @return     Whether the character is in ['a', 'z'].
+ */
+int (islower)(int c)
+{
+  return islower(c);
+}
+
+
+/**
+ * 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 ' '.
+ */
+int (isprint)(int c)
+{
+  return isprint(c);
+}
+
+
+/**
+ * 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 c)
+{
+  return ispunct(c);
+}
+
+
+/**
+ * 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 c)
+{
+  return isspace(c);
+}
+
+
+/**
+ * Check whether a character is an uppercase
+ * alphabetical character.
+ * 
+ * @param   c  The character.
+ * @return     Whether the character is in ['A', 'Z'].
+ */
+int (isupper)(int c)
+{
+  return isupper(c);
+}
+
+
+/**
+ * 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 c)
+{
+  return isxdigit(c);
+}
+
+
+
+/**
+ * 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 c)
+{
+  return tolower(c);
+}
+
+
+/**
+ * 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 c)
+{
+  return toupper(c);
+}
+
+
+
+/**
+ * Check whether a character is an ASCII character.
+ * 
+ * @param   c  The character
+ * @return  -  Whether the character is an ASCII character.
+ */
+int (isascii)(int c)
+{
+  return isascii(c);
+}
+
+
+/**
+ * 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 c)
+{
+  return c & 0x7F;
+}
+
+
+/**
+ * This function is identical to `tolower`.
+ * It is provided for backwards-compatibility with SVID.
+ */
+int _tolower(int c)
+{
+  return tolower(c);
+}
+
+
+/**
+ * This function is identical to `tolower`.
+ * It is provided for backwards-compatibility with SVID.
+ */
+int _toupper(int c)
+{
+  return toupper(c);
+}
+