5 files changed, 482 insertions, 19 deletions
diff --git a/src/mds-kbdc/functions.c b/src/mds-kbdc/functions.c
new file mode 100644
index 0000000..0d608f1
--- /dev/null
+++ b/src/mds-kbdc/functions.c
@@ -0,0 +1,293 @@
+/**
+ * mds — A micro-display server
+ * Copyright © 2014  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 "functions.h"
+
+#include <stdlib.h>
+
+
+
+/**
+ * Define useful data for built-in function with 2 parameters.
+ */
+#define define_2						\
+  const char32_t* restrict a = va_arg(args, const char32_t*);	\
+  const char32_t* restrict b = va_arg(args, const char32_t*);	\
+  size_t an = string_length(a);					\
+  size_t bn = string_length(b);					\
+  size_t i, n = an > bn ? an : bn;				\
+  char32_t* restrict rc = malloc((n + 1) * sizeof(char32_t));	\
+  if (rc == NULL)						\
+    return NULL;						\
+  rc[n] = -1
+
+/**
+ * Define useful data for built-in function with 1 parameter.
+ */
+#define define_1						\
+  const char32_t* restrict a = va_arg(args, const char32_t*);	\
+  size_t i, n = string_length(a);				\
+  char32_t* restrict rc = malloc((n + 1) * sizeof(char32_t));	\
+  if (rc == NULL)						\
+    return NULL;						\
+  rc[n] = -1
+
+
+/**
+ * Definition of the built-in function add/2.
+ * 
+ * @param   args  The arguments passed to the function.
+ * @return        The return value of the function, `NULL` on error.
+ */
+static char32_t* function_builtin_add_2(va_list args)
+{
+  define_2;
+  for (i = 0; i < n; i++)
+    rc[i] = a[i % an] + b[i % bn];
+  return rc;
+}
+
+
+/**
+ * Definition of the built-in function sub/2.
+ * 
+ * @param   args  The arguments passed to the function.
+ * @return        The return value of the function, `NULL` on error.
+ */
+static char32_t* function_builtin_sub_2(va_list args)
+{
+  define_2;
+  for (i = 0; i < n; i++)
+    rc[i] = a[i % an] - b[i % bn];
+  return rc;
+}
+
+
+/**
+ * Definition of the built-in function mul/2.
+ * 
+ * @param   args  The arguments passed to the function.
+ * @return        The return value of the function, `NULL` on error.
+ */
+static char32_t* function_builtin_mul_2(va_list args)
+{
+  define_2;
+  for (i = 0; i < n; i++)
+    rc[i] = a[i % an] * b[i % bn];
+  return rc;
+}
+
+
+/**
+ * Definition of the built-in function div/2.
+ * 
+ * @param   args  The arguments passed to the function.
+ * @return        The return value of the function, `NULL` on error.
+ */
+static char32_t* function_builtin_div_2(va_list args)
+{
+  define_2;
+  for (i = 0; i < n; i++)
+    rc[i] = a[i % an] / b[i % bn];
+  return rc;
+}
+
+
+/**
+ * Definition of the built-in function mod/2.
+ * 
+ * @param   args  The arguments passed to the function.
+ * @return        The return value of the function, `NULL` on error.
+ */
+static char32_t* function_builtin_mod_2(va_list args)
+{
+  define_2;
+  for (i = 0; i < n; i++)
+    rc[i] = a[i % an] % b[i % bn];
+  return rc;
+}
+
+
+/**
+ * Definition of the built-in function rsh/2.
+ * 
+ * @param   args  The arguments passed to the function.
+ * @return        The return value of the function, `NULL` on error.
+ */
+static char32_t* function_builtin_rsh_2(va_list args)
+{
+  define_2;
+  for (i = 0; i < n; i++)
+    rc[i] = a[i % an] << b[i % bn];
+  return rc;
+}
+
+
+/**
+ * Definition of the built-in function lsh/2.
+ * 
+ * @param   args  The arguments passed to the function.
+ * @return        The return value of the function, `NULL` on error.
+ */
+static char32_t* function_builtin_lsh_2(va_list args)
+{
+  define_2;
+  for (i = 0; i < n; i++)
+    rc[i] = a[i % an] >> b[i % bn];
+  return rc;
+}
+
+
+/**
+ * Definition of the built-in function or/2.
+ * 
+ * @param   args  The arguments passed to the function.
+ * @return        The return value of the function, `NULL` on error.
+ */
+static char32_t* function_builtin_or_2(va_list args)
+{
+  define_2;
+  for (i = 0; i < n; i++)
+    rc[i] = a[i % an] | b[i % bn];
+  return rc;
+}
+
+
+/**
+ * Definition of the built-in function and/2.
+ * 
+ * @param   args  The arguments passed to the function.
+ * @return        The return value of the function, `NULL` on error.
+ */
+static char32_t* function_builtin_and_2(va_list args)
+{
+  define_2;
+  for (i = 0; i < n; i++)
+    rc[i] = a[i % an] & b[i % bn];
+  return rc;
+}
+
+
+/**
+ * Definition of the built-in function xor/2.
+ * 
+ * @param   args  The arguments passed to the function.
+ * @return        The return value of the function, `NULL` on error.
+ */
+static char32_t* function_builtin_xor_2(va_list args)
+{
+  define_2;
+  for (i = 0; i < n; i++)
+    rc[i] = a[i % an] ^ b[i % bn];
+  return rc;
+}
+
+
+/**
+ * Definition of the built-in function not/1.
+ * 
+ * @param   args  The arguments passed to the function.
+ * @return        The return value of the function, `NULL` on error.
+ */
+static char32_t* function_builtin_not_1(va_list args)
+{
+  define_1;
+  for (i = 0; i < n; i++)
+    rc[i] = !a[i];
+  return rc;
+}
+
+
+/**
+ * Definition of the built-in function equals/2.
+ * 
+ * @param   args  The arguments passed to the function.
+ * @return        The return value of the function, `NULL` on error.
+ */
+static char32_t* function_builtin_equals_2(va_list args)
+{
+  define_2;
+  for (i = 0; i < n; i++)
+    rc[i] = a[i % an] == b[i % bn];
+  return rc;
+}
+
+
+/**
+ * Definition of the built-in function greater/2.
+ * 
+ * @param   args  The arguments passed to the function.
+ * @return        The return value of the function, `NULL` on error.
+ */
+static char32_t* function_builtin_greater_2(va_list args)
+{
+  define_2;
+  for (i = 0; i < n; i++)
+    rc[i] = a[i % an] > b[i % bn];
+  return rc;
+}
+
+
+/**
+ * Definition of the built-in function less/2.
+ * 
+ * @param   args  The arguments passed to the function.
+ * @return        The return value of the function, `NULL` on error.
+ */
+static char32_t* function_builtin_less_2(va_list args)
+{
+  define_2;
+  for (i = 0; i < n; i++)
+    rc[i] = a[i % an] < b[i % bn];
+  return rc;
+}
+
+
+/* static char32_t* function_builtin_set_2(va_list args);  (variable index value) */
+/* static char32_t* function_builtin_get_2(va_list args);  (variable index) */
+
+
+#undef define_1
+#undef define_2
+
+
+/**
+ * Check whether a function is defined.
+ * 
+ * @param   name       The name of the function.
+ * @param   arg_count  The number of arguments to pass to the function.
+ * @return             Whether the function is defined for the selected number of arguments.
+ */
+int function_check_defined(const char32_t* restrict name, size_t arg_count)
+{
+  return 0; /* TODO */
+}
+
+
+/**
+ * Invoke a function defined in the keyboard layout source code, or that is builtin.
+ * 
+ * @param   name           The name of the function.
+ * @param   arg_count      The number of arguments to pass to the function.
+ * @param   ...:char32_t*  The arguments to pass, do not end with a sentinel.
+ * @return                 The return value of the function, `NULL` on error.
+ */
+char32_t* function_invoke(const char32_t* restrict name, size_t arg_count, ...)
+{
+  return NULL; /* TODO */
+}
+
diff --git a/src/mds-kbdc/functions.h b/src/mds-kbdc/functions.h
new file mode 100644
index 0000000..158c0b1
--- /dev/null
+++ b/src/mds-kbdc/functions.h
@@ -0,0 +1,51 @@
+/**
+ * mds — A micro-display server
+ * Copyright © 2014  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 MDS_MDS_KBDC_FUNCTIONS_H
+#define MDS_MDS_KBDC_FUNCTIONS_H
+
+
+#include "string.h"
+
+#include <stddef.h>
+#include <stdarg.h>
+
+
+/**
+ * Check whether a function is defined.
+ * 
+ * @param   name       The name of the function.
+ * @param   arg_count  The number of arguments to pass to the function.
+ * @return             Whether the function is defined for the selected number of arguments.
+ */
+int function_check_defined(const char32_t* restrict name, size_t arg_count) __attribute__((nonnull));
+
+/**
+ * Invoke a function defined in the keyboard layout source code, or that is builtin.
+ * 
+ * @param   name           The name of the function.
+ * @param   arg_count      The number of arguments to pass to the function.
+ * @param   ...:char32_t*  The arguments to pass, do not end with a sentinel.
+ * @return                 The return value of the function, `NULL` on error.
+ */
+char32_t* function_invoke(const char32_t* restrict name, size_t arg_count, ...) __attribute__((nonnull));
+
+/* TODO define functions, check if function is built in */
+
+
+#endif
+
diff --git a/src/mds-kbdc/mds-kbdc.c b/src/mds-kbdc/mds-kbdc.c
index da1d9a4..2cc6cff 100644
--- a/src/mds-kbdc/mds-kbdc.c
+++ b/src/mds-kbdc/mds-kbdc.c
@@ -44,9 +44,9 @@ int main(int argc_, char** argv_)
   
   source_code_initialise(&source_code);
   fail_if (read_source_lines(pathname, &source_code) < 0);
-
+  
   /*
-   
+    
     information
       language "LANGUAGE" # multiple is allowed
       country "COUNTRY" # multiple is allowed
@@ -103,23 +103,6 @@ int main(int argc_, char** argv_)
       let \2 : \or(\2 64)
     end if
     
-    \add(a b)     # a + b
-    \sub(a b)     # a - b
-    \mul(a b)     # a ⋅ b
-    \div(a b)     # floor[a / b]
-    \mod(a b)     # a mod b
-    \rsh(a b)     # a ⋅ 2 ↑ b
-    \lsh(a b)     # floor[a / 2 ↑ b]
-    \or(a b)      # bitwise
-    \and(a b)     # bitwise
-    \xor(a b)     # bitwise
-    \not(a)       # logical
-    \equals(a b)  # a = b
-    \greater(a b) # a > b
-    \less(a b)    # a < b
-    \set(variable index value)
-    \get(variable index)
-    
    */
   
   source_code_destroy(&source_code);
diff --git a/src/mds-kbdc/string.c b/src/mds-kbdc/string.c
new file mode 100644
index 0000000..ca33b83
--- /dev/null
+++ b/src/mds-kbdc/string.c
@@ -0,0 +1,84 @@
+/**
+ * mds — A micro-display server
+ * Copyright © 2014  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 "string.h"
+
+#include <libmdsserver/macros.h>
+
+#include <stdlib.h>
+
+
+
+/**
+ * Get the length of a string.
+ * 
+ * @param   string  The string.
+ * @return          The length of the string.
+ */
+size_t string_length(const char32_t* restrict string)
+{
+  size_t i = 0;
+  while (string[i] >= 0)
+    i++;
+  return i;
+}
+
+
+/**
+ * Convert a NUL-terminated UTF-8 string to a -1-terminated UTF-32 string.
+ * 
+ * @param   string  The UTF-8 string.
+ * @return          The string in UTF-32, `NULL` on error.
+ */
+char32_t* string_decode(const char* restrict string)
+{
+  size_t i, j, n, length = 0;
+  char32_t* rc;
+  
+  /* Get the length of the UTF-32 string, excluding termination. */
+  for (i = 0; string[i]; i++)
+    if ((string[i] & 0xC0) != 0x80)
+      length++;
+  
+  /* Allocated UTF-32 string. */
+  if (xmalloc(rc, length + 1, char32_t))
+    return NULL;
+  
+  /* Convert to UTF-32. */
+  for (i = j = n = 0; string[i]; i++)
+    {
+      char c = string[i];
+      if (n)
+	{
+	  rc[j] <<= 6, rc[j] |= c & 0x3F;
+	  if (--n == 0)
+	    j++;
+	}
+      else if ((c & 0xC0) == 0xC0)
+	{
+	  while (c & 0x80)
+	    n++, c = (char)(c << 1);
+	  rc[j] = c >> n--;
+	}
+      else
+	rc[j++] = c & 255;
+    }
+  
+  /* -1-terminate and return. */
+  return rc[length] = -1, rc;
+}
+
diff --git a/src/mds-kbdc/string.h b/src/mds-kbdc/string.h
new file mode 100644
index 0000000..6a5d528
--- /dev/null
+++ b/src/mds-kbdc/string.h
@@ -0,0 +1,52 @@
+/**
+ * mds — A micro-display server
+ * Copyright © 2014  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 MDS_MDS_KBDC_STRING_H
+#define MDS_MDS_KBDC_STRING_H
+
+
+#include <stdint.h>
+#include <stddef.h>
+
+
+/**
+ * Data type for a character in a decoded string.
+ */
+typedef int32_t char32_t;
+
+
+/**
+ * Get the length of a string.
+ * 
+ * @param   string  The string.
+ * @return          The length of the string.
+ */
+size_t string_length(const char32_t* restrict string) __attribute__((pure, nonnull));
+
+/**
+ * Convert a NUL-terminated UTF-8 string to a -1-terminated UTF-32 string.
+ * 
+ * @param   string  The UTF-8 string.
+ * @return          The string in UTF-32, `NULL` on error.
+ */
+char32_t* string_decode(const char* restrict string) __attribute__((nonnull));
+
+/* TODO string_encode */
+
+
+#endif
+