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.
#include <stdarg.h> #include <stdio.h> #include <string.h>
int msprintf(char **strp, const char *fmt, ...) { va_list ap; int res; va_start (ap, fmt); res=asprintf (strp, fmt, ap); va_end (ap); }
int main() { char *buffer;
asprintf(&buffer,"test: %d\n",5); write(1,buffer,strlen(buffer)); free(buffer);
msprintf(&buffer,"test: %d\n",5); write(1,buffer,strlen(buffer)); free(buffer); }