add stddef.h

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

2 files changed, 164 insertions, 0 deletions

diff --git a/include/bits/types.h b/include/bits/types.h
new file mode 100644
index 0000000..1fffa0c
--- /dev/null
+++ b/include/bits/types.h
@@ -0,0 +1,92 @@
+/**
+ * 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/>.
+ */
+/* That's right. No inclusion-guard; we want multiple
+ * headers to be able to define types by including this
+ * header without the need of keeping in mind which
+ * order headers are included. */
+
+
+/**
+ * Signed integer type of the result of subtracting two pointers.
+ * May not be greater than the with of type long.
+ */
+#if defined(__NEED_ptrdiff_t) && !defined(__DEFINED_ptrdiff_t)
+# define __DEFINED_ptrdiff_t
+typedef signed long int ptrdiff_t;
+#endif
+
+
+/**
+ * Unsigned version of `ptrdiff_t`
+ */
+#if defined(__NEED_uptrdiff_t) && !defined(__DEFINED_uptrdiff_t)
+# define __DEFINED_uptrdiff_t
+typedef unsigned long int uptrdiff_t;
+#endif
+
+
+/**
+ * Integer type which can represent any character.
+ * May not be greater than the with of type long.
+ * 
+ * Unicode originally had an, inclusive upper limit
+ * of U+FFFF. UTF-8 however had 31-bits (U+7FFFFFFF).
+ * Unicode is now limited to 0x10FFFF.
+ * 
+ * 32 bits should be sufficient (long is at least 32
+ * bits), but why limit further than POSIX does.
+ */
+#if defined(__NEED_wchar_t) && !defined(__DEFINED_wchar_t)
+# define __DEFINED_wchar_t
+typedef long int wchar_t;
+#endif
+
+
+/**
+ * Unsigned integer type of the result of the
+ * `sizeof` operator. May not be greater than the
+ * with of type long.
+ */
+#if defined(__NEED_size_t) && !defined(__DEFINED_size_t)
+# define __DEFINED_size_t
+typedef unsigned long int size_t;
+#endif
+
+
+/**
+ * Signed version of `size_t`
+ */
+#if defined(__NEED_ssize_t) && !defined(__DEFINED_ssize_t)
+# define __DEFINED_ssize_t
+typedef signed long int ssize_t;
+#endif
+
+
+/**
+ * A type, of unspecified construct, whose alignment requirement
+ * is at least as strict as that of every scalar type.
+ */
+#if defined(__NEED_max_align_t) && !defined(__DEFINED_max_align_t)
+# define __DEFINED_max_align_t
+typedef struct
+{
+  long long int __lli __attribute__((__aligned__(__alignof__(long long int))));
+  long double   __ld  __attribute__((__aligned__(__alignof__(long double))));
+} max_align_t;
+#endif
+
diff --git a/include/stddef.h b/include/stddef.h
new file mode 100644
index 0000000..b8ad4ea
--- /dev/null
+++ b/include/stddef.h
@@ -0,0 +1,72 @@
+/**
+ * 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 _STDDEF_H
+#define _STDDEF_H
+
+
+
+/**
+ * `NULL` is a zero-values constant, conventionally
+ * a `void`-pointer (it is specified this way in
+ * POSIX, it does not really matter and ISO C does
+ * not specify it this way), use to indicate that
+ * a pointer does not point to anything.
+ */
+#define NULL  ((void*)0)
+
+
+/**
+ * Get the offset of a member in a `struct`, in bytes.
+ * 
+ * For example. Consider the structure
+ * ```
+ * struct example
+ * {
+ *   char offset_is_0[16];
+ *   char offset_is_16[16];
+ * }
+ * ```
+ * `offsetof(struct example, offset_is_0)` evaluates to
+ * 0 because it is at the top of the structure.
+ * `offsetof(struct example, offset_is_16)` evaluates to
+ * 16 because the member above it in the structure
+ * has offset 0 and size 16. 0 + 16 = 16.
+ * 
+ * @param   type:identifier    The identifier for a structure.
+ * @param   member:identifier  The identifier for a member, direct or indirect,
+ *                             of the structure.
+ * @return  :size_t            The offset of the member.
+ */
+#define offsetof(type, member)  \
+  ((size_t)((char*)&(((type*)NULL)->member) - (char*)NULL))
+
+
+
+#define __NEED_ptrdiff_t
+#define __NEED_wchar_t
+#define __NEED_size_t
+#if __STDC_VERSION__ >= 201112L
+# define __NEED_max_align_t
+#endif
+
+#include <bits/types.h>
+
+
+
+#endif
+