add div functions

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

3 files changed, 178 insertions, 3 deletions

diff --git a/include/bits/types.h b/include/bits/types.h
index 41967f2..5d99e4f 100644
--- a/include/bits/types.h
+++ b/include/bits/types.h
@@ -25,6 +25,13 @@
 #include <bits/intconf.h>
 
 
+/* Ensure that dependencies for type are defined. */
+#if defined(__NEED_imaxdiv_t) && !defined(__NEED_intmax_t)
+# define __NEED_intmax_t
+#endif
+
+
+
 /**
  * Returns the maximum value of an unsigned integer type,
  * in that type.
@@ -267,3 +274,91 @@ typedef int sig_atomic_t;
 # define __SIG_ATOMIC_BIT  __INT_BIT
 #endif
 
+
+/**
+ * A structure than holds both the quotient and
+ * the remainer in an integer division, of
+ * `int` type.
+ */
+#if defined(__NEED_div_t) && !defined(__DEFINED_div_t)
+# define __DEFINED_div_t
+typedef struct {
+  /**
+   * Quotient.
+   */
+  int quot;
+  
+  /**
+   * Remainder.
+   */
+  int rem;
+  
+} div_t;
+#endif
+
+
+/**
+ * A structure than holds both the quotient and
+ * the remainer in an integer division, of
+ * `long int` type.
+ */
+#if defined(__NEED_ldiv_t) && !defined(__DEFINED_ldiv_t)
+# define __DEFINED_ldiv_t
+typedef struct {
+  /**
+   * Quotient.
+   */
+  long int quot;
+  
+  /**
+   * Remainder.
+   */
+  long int rem;
+  
+} ldiv_t;
+#endif
+
+
+/**
+ * A structure than holds both the quotient and
+ * the remainer in an integer division, of
+ * `long long int` type.
+ */
+#if defined(__NEED_lldiv_t) && !defined(__DEFINED_lldiv_t)
+# define __DEFINED_lldiv_t
+typedef struct {
+  /**
+   * Quotient.
+   */
+  long long int quot;
+  
+  /**
+   * Remainder.
+   */
+  long long int rem;
+  
+} lldiv_t;
+#endif
+
+
+/**
+ * A structure than holds both the quotient and
+ * the remainer in an integer division, of
+ * `intmax_t` type.
+ */
+#if defined(__NEED_imaxdiv_t) && !defined(__DEFINED_imaxdiv_t)
+# define __DEFINED_imaxdiv_t
+typedef struct {
+  /**
+   * Quotient.
+   */
+  intmax_t quot;
+  
+  /**
+   * Remainder.
+   */
+  intmax_t rem;
+  
+} imaxdiv_t;
+#endif
+
diff --git a/include/inttypes.h b/include/inttypes.h
new file mode 100644
index 0000000..dac5e27
--- /dev/null
+++ b/include/inttypes.h
@@ -0,0 +1,45 @@
+/**
+ * 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 _STDLIB_H
+#define _STDLIB_H
+#include <slibc/version.h>
+#include <slibc/features.h>
+
+
+
+#define __NEED_intmax_t
+#define __NEED_imaxdiv_t
+
+#include <bits/types.h>
+
+
+/**
+ * Perform an integer division and return
+ * both the quotient and the remainder.
+ * 
+ * @param   numerator    The numerator.
+ * @param   denominator  The denominator.
+ * @return               The quotient in `.quot`, and
+ *                       the remainder in `.rem`.
+ */
+imaxdiv_t imaxdiv(intmax_t, intmax_t);
+
+
+
+#endif
+
diff --git a/include/stdlib.h b/include/stdlib.h
index f24fbf3..fd78d27 100644
--- a/include/stdlib.h
+++ b/include/stdlib.h
@@ -27,9 +27,9 @@
 
 #define __NEED_size_t
 #define __NEED_wchar_t
-#define __NEED_div_t /* TODO not defined */
-#define __NEED_ldiv_t /* TODO not defined */
-#define __NEED_lldiv_t /* TODO not defined */
+#define __NEED_div_t
+#define __NEED_ldiv_t
+#define __NEED_lldiv_t
 
 #include <bits/types.h>
 
@@ -56,5 +56,40 @@
 
 
 
+/**
+ * Perform an integer division and return
+ * both the quotient and the remainder.
+ * 
+ * @param   numerator    The numerator.
+ * @param   denominator  The denominator.
+ * @return               The quotient in `.quot`, and
+ *                       the remainder in `.rem`.
+ */
+div_t div(int, int);
+
+/**
+ * Perform an integer division and return
+ * both the quotient and the remainder.
+ * 
+ * @param   numerator    The numerator.
+ * @param   denominator  The denominator.
+ * @return               The quotient in `.quot`, and
+ *                       the remainder in `.rem`.
+ */
+ldiv_t ldiv(long, long);
+
+/**
+ * Perform an integer division and return
+ * both the quotient and the remainder.
+ * 
+ * @param   numerator    The numerator.
+ * @param   denominator  The denominator.
+ * @return               The quotient in `.quot`, and
+ *                       the remainder in `.rem`.
+ */
+lldiv_t lldiv(long long, long long);
+
+
+
 #endif