3 files changed, 138 insertions, 0 deletions
diff --git a/strings/strings.cpp b/strings/strings.cpp
new file mode 100644
index 0000000..4c8486f
--- /dev/null
+++ b/strings/strings.cpp
@@ -0,0 +1,31 @@
+u64 CstrSize(const char* cstr)
+{
+  u8 *iter = (u8*)cstr;
+  u64 size = 0;
+  for(;*iter != 0; *iter++) {
+    size += 1;
+  }
+
+  return size;
+}
+
+struct str8 Str8(u8 *string, u64 size)
+{
+  struct str8 result = {string, size};
+  return result;
+}
+
+struct res_str8 Str8InitCstr(struct arena *a, const char* cstr)
+{
+  u64 cstr_size = CstrSize(cstr);
+  struct res_void cstr_res = arena_alloc(a, cstr_size);
+  u8 *str = (u8 *)cstr_res.memory;
+  u64 str_size = cstr_res.bytes_count;
+  
+  MemCopy((void*)str, (void*)cstr, str_size*sizeof(u8));
+
+  struct res_str8 result = {};
+  result.string = Str8(str, str_size);
+  result.bytes_count = str_size;
+  return result;
+}
diff --git a/strings/strings.h b/strings/strings.h
new file mode 100644
index 0000000..dbaff7a
--- /dev/null
+++ b/strings/strings.h
@@ -0,0 +1,42 @@
+#ifndef AMR_STR
+#define AMR_STR
+
+#include <assert.h>
+#include <string.h>
+
+#define MemCopy memcpy
+
+// @todo: the function names have been changed a bit for the interest
+// of speed. Some structs and functions share the same names, so 
+// I need to fix this but also make sure the functions have good names
+
+enum StrStatus {STR_OK=0, STR_FULL};
+
+struct str8 {
+  u8    *buffer;
+  u64   size;
+};
+
+struct str8_node {
+  str8_node *next;
+  str8       string;
+};
+
+struct str8_list {
+  str8_node   *first;
+  str8_node   *last;
+  u64          count;
+  u64          capacity;
+};
+
+struct res_str8 {
+  str8           string;
+  u64            bytes_count;
+  enum StrStatus status;
+};
+
+struct str8     Str8(u8 *string, u64 size);
+u64             CstrSize(const char* cstr);
+struct res_str8 Str8InitCstr(struct arena *a, const char* cstr, u64 size);
+
+#endif
diff --git a/strings/test.cpp b/strings/test.cpp
new file mode 100644
index 0000000..49f81c9
--- /dev/null
+++ b/strings/test.cpp
@@ -0,0 +1,65 @@
+#include <stdio.h>
+#include "strings.h"
+#include "strings.cpp"
+
+void TestCstrSize()
+{
+  u64 size = CstrSize("hello sailor\n");
+  assert(size == 13 && "test_cstr_size() failed"
+      "the cstr size was wrong\n");
+}
+
+void TestEmptyCstrSize()
+{
+  u64 size = CstrSize("");
+  assert(size == 0 && "test_empty_cstr_size() failed"
+      "the cstr size was wrong\n");
+}
+
+void TestStr8InitCstr(u8* buffer, u64 buffer_size)
+{
+  struct arena a = {};
+  arena_init(&a, buffer, buffer_size);
+  struct res_str8 qres = Str8InitCstr(&a, "hello sailor");
+  assert((qres.bytes_count == 12) && "Error TestStr8InitCstr:\n"
+      "Reason: Invalid size of allocated string\n"
+      "Hint: check what is happening to the bytes_count and how it is set first\n");
+}
+
+void TestStr8InitCstrEmpty(u8* buffer, u64 buffer_size)
+{
+  struct arena a = {};
+  arena_init(&a, buffer, buffer_size);
+  struct res_str8 qres = Str8InitCstr(&a, "");
+  assert((qres.string.size == 0) && "Error TestStr8InitCstrEmpty:\n"
+      "Reason: Invalid size of allocated string\n"
+      "Hint: check what is happening to the bytes_count and how it is set first\n");
+}
+
+void TestStr8InitCstrNoSpace(u8* buffer, u8 buffer_size)
+{
+  struct arena a = {};
+  arena_init(&a, buffer, buffer_size);
+  struct res_str8 qres = Str8InitCstr(&a, "hello sailor, looks like you've got no space here on this boat!");
+  assert(qres.string.size == 0 && "Error TestStr8InitStrNoSpace:\n"
+      "Reason: the bytes count is not 0, even though the string is larger than the supposedly available\n"
+      "arena space. This is an error and should not occur.\n"
+      "Hint: Look at what is going on in the allocation since that arena helpers handle allocations\n.");
+}
+
+void test_strings()
+{
+  printf("\n======= Testing Strings Library =======\n");
+  printf("===== Testing Cstring Functions =====\n");
+  TestCstrSize();
+  TestEmptyCstrSize();
+
+  u64 buffer_size = KB(64);
+  u8* buffer = (u8*)malloc(sizeof(u8)*buffer_size);
+
+  TestStr8InitCstr(buffer, buffer_size);
+  TestStr8InitCstrEmpty(buffer, buffer_size);
+  TestStr8InitCstrNoSpace(buffer, 8);
+  printf("Cstring tests passed successfully\n");
+  free(buffer);
+}