Revert "Revert "Initial commit - work done up through 11 Feb 2020""

This reverts commit 56f77cf071.

oops

string/memcmp.c

@@ -0,0 +1,17 @@
+#include <string.h>
+
+int memcmp(const void * a_ptr, const void * b_ptr, size_t size) {
+  const unsigned char * a = (const unsigned char *) a_ptr;
+  const unsigned char * b = (const unsigned char *) b_ptr;
+
+  for(size_t i = 0; i < size; i++) {
+    if(a[i] < b[i]) {
+      return -1;
+    }
+    else if(a[i] > b[i]) {
+      return 1;
+    }
+  }
+
+  return 0;
+}

string/memcmp.libk.d

@@ -0,0 +1,3 @@
+string/memcmp.libk.o: string/memcmp.c include/string.h \
+ include/sys/cdefs.h \
+ /usr/home/helmsulfrinn/opt/cross/lib/gcc/i686-elf/9.2.0/include/stddef.h

string/memcpy.c

@@ -0,0 +1,12 @@
+#include <string.h>
+
+void * memcpy(void * restrict dest, const void * restrict src, size_t size) {
+  unsigned char * to = (unsigned char *) dest;
+  const unsigned char * from = (const unsigned char *) src;
+
+  for(size_t i = 0; i < size; i++) {
+    to[i] = from[i];
+  }
+
+  return dest;
+}

string/memcpy.libk.d

@@ -0,0 +1,3 @@
+string/memcpy.libk.o: string/memcpy.c include/string.h \
+ include/sys/cdefs.h \
+ /usr/home/helmsulfrinn/opt/cross/lib/gcc/i686-elf/9.2.0/include/stddef.h

string/memmove.c

@@ -0,0 +1,20 @@
+#include <string.h>
+
+void * memmove(void * dest, const void * src, size_t size) {
+  unsigned char * to = (unsigned char *) dest;
+  const unsigned char * from = (const unsigned char *) src;
+
+  /* We check this to make sure we don't overwrite memory */
+  if(to < from) {
+    for(size_t i = 0; i < size; i++) {
+      to[i] = from[i];
+    }
+  }
+  else {
+    for(size_t i = size; i != 0; i--) {
+      to[i - 1] = from[i - 1];
+    }
+  }
+  
+  return dest;
+}

string/memmove.libk.d

@@ -0,0 +1,3 @@
+string/memmove.libk.o: string/memmove.c include/string.h \
+ include/sys/cdefs.h \
+ /usr/home/helmsulfrinn/opt/cross/lib/gcc/i686-elf/9.2.0/include/stddef.h

string/memset.c

@@ -0,0 +1,11 @@
+#include <string.h>
+
+void * memset(void * buffer, int value, size_t size) {
+  unsigned char * buf = (unsigned char *) buffer;
+
+  for(size_t i = 0; i < size; i++) {
+    buf[i] = (unsigned char) value;
+  }
+
+  return buffer;
+}

string/memset.libk.d

@@ -0,0 +1,3 @@
+string/memset.libk.o: string/memset.c include/string.h \
+ include/sys/cdefs.h \
+ /usr/home/helmsulfrinn/opt/cross/lib/gcc/i686-elf/9.2.0/include/stddef.h

string/strlen.c

@@ -0,0 +1,9 @@
+#include <string.h>
+
+size_t strlen(const char * str) {
+  size_t len = 0;
+  while(str[len] != '\0') {
+    len++;
+  }
+  return len;
+}

string/strlen.libk.d

@@ -0,0 +1,3 @@
+string/strlen.libk.o: string/strlen.c include/string.h \
+ include/sys/cdefs.h \
+ /usr/home/helmsulfrinn/opt/cross/lib/gcc/i686-elf/9.2.0/include/stddef.h