Update string.h.md

1 files changed, 46 insertions, 0 deletions

diff --git a/doc/api/mruby/string.h.md b/doc/api/mruby/string.h.md
index 428a3ca40..1268792e0 100644
--- a/doc/api/mruby/string.h.md
+++ b/doc/api/mruby/string.h.md
@@ -1,3 +1,7 @@
+## Macros

+### mrb_str_ptr(s)

+Returns a pointer from a Ruby string.

+## Functions

 ### mrb_str_plus

 ```C

    mrb_value mrb_str_plus(mrb_state*, mrb_value, mrb_value);

@@ -43,3 +47,45 @@ Duplicates a string object.
    mrb_value mrb_str_intern(mrb_state *mrb, mrb_value self);

 ```

 Returns a symbol from a passed in string.

+### mrb_str_to_str

+```C

+   mrb_value mrb_str_to_str(mrb_state *mrb, mrb_value str);

+```

+Returns a converted string type.

+### mrb_str_equal

+```C

+   mrb_bool mrb_str_equal(mrb_state *mrb, mrb_value str1, mrb_value str2);

+```

+Returns true if the strings match and false if the strings don't match.

+### mrb_str_cat

+```C

+   mrb_value mrb_str_cat(mrb_state *mrb, mrb_value str, const char *ptr, size_t len);

+```

+Returns a concated string comprised of a Ruby string and a C string.

+### mrb_str_cat_cstr

+```C

+   mrb_value mrb_str_cat_str(mrb_state *mrb, mrb_value str, mrb_value str2);

+```

+Returns a concated string comprised of a Ruby string and a C string(A shorter alternative to mrb_str_cat).

+### mrb_str_append

+```C

+   mrb_value mrb_str_append(mrb_state *mrb, mrb_value str, mrb_value str2);

+```

+Adds str2 to the end of str1.

+### mrb_str_cmp

+```C

+   int mrb_str_cmp(mrb_state *mrb, mrb_value str1, mrb_value str2);

+```

+Returns 0 if both Ruby strings are equal.

+Returns a value < 0 if Ruby str1 is less than Ruby str2.

+Returns a value > 0 if Ruby str2 is greater than Ruby str1.

+### mrb_str_to_cstr

+```C

+   char *mrb_str_to_cstr(mrb_state *mrb, mrb_value str);

+```

+Returns a C string from a Ruby string.

+### mrb_str_inspect

+```C

+   mrb_str_inspect(mrb_state *mrb, mrb_value str);

+```

+Returns a printable version of str, surrounded by quote marks, with special characters escaped.