asprintf.c

There is a bug on page 190, 2nd edition.
The line:
if(!str)
Should be:
if(!*str)

I also remember another "bug": a semicolon at the end of a one-line-macro, but I do not remember the page.
Regards.

PS:
it's a good book, but some new tips are not so new.
For example, you describe autotools instead of cmake.