<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> </head> <body bgcolor="#ffffff" text="#000000"> According to the v4.2.4 manual, mpf_get_str can be called with a NULL in the first argument: <blockquote>If str is NULL, the result string is allocated using the current allocation function (see Chapter 14 [Custom Allocation], page 85). The block will be strlen(str)+1 bytes, that being exactly enough for the string and null-terminator. </blockquote> What I'd like to know is whether this block needs to be freed, and if so, how? Is it simply a case of <blockquote>free( ptr, strlen(ptr)+1); </blockquote> ? Kind regards, Bruce. </body> </html>