[GLib] How to get substrings?

[Daniel Miralles García <namarie oasi upc es>]

Hi, dudes!

I'm porting my old-style char* to gchar* (due to some SF's that appear 
when I dont't printf("")).

I've been looking a few here and there, but found no function to get a 
substring (I mean, from a string, get a substring between two characters 
or even two positions). For instance:

  Origin = "ABCDEFGH"
  my_str = g_get_substring_beteen (origin, "D", "G");

and then my_str=="EF"

I though making it, but I need some "look a character" function:

  char mychar = g_get_char (origin, position);

or something like this...
...and then maybe appending a character to a string? 
  origin = g_strdup("hell");
  g_string_append_char (origin, "o");

  just to have origin -> "hello"...

Any function in GLIB to do that?

Thanx a lot...

.-:Namarie:-.