On 02/10/08 16:06, Wolfgang Rohdewald wrote:
Hi,
I am making the muggle plugin work with UTF-8 and have a little problem:
since asprintf leads to segfaults if feeded with incorrect UTF-8 characters, I wanted to write a wrapper function which would then check the return value of asprintf. However I have a problem with the variable argument list and the va_* macros. Using gdb shows that, in the following example, in
res=asprintf (strp, fmt, ap);
ap is interpreted not as a list of arguments but as an integer.
What is wrong here?
BTW I am quite sure that vdr will sometimes coredump since it never checks the return value of asprintf. One suspect would be if somebody used a latin1 charset and had special characters like äöü in file names and then changes to utf-8 without converting file names to utf-8. If vdr then passes such a file name to asprintf, corrupted memory results. Might be difficult to debug remotely.
You could use VDR's cString::sprintf() instead. This is probably also what I am going to do in the VDR core code, to avoid asprintf() altogether. The single leftover vasprintf() call in cString::sprintf() can then be made safe.
Klaus