Now, this has to be some strange magic stuff or something. I've got an SV
that somehow seems to overwrite itself as a result of an sv_catpv? Here's
a bit of code (where ST(0)/opts should be a string that's an struct option *):
if (mapfile) {
opts->mapfile = SvEND(ST(0));
printf("opts->mapfile = %X\n", SvEND(ST(0)) );
sv_catpv( ST(0), mapfile );
printf("Now mapfile = %s -> %s\n", mapfile, opts->mapfile);
}
if (outfile) {
int i;
printf("appending outfile\n");
opts->outfile = i = SvEND(ST(0));
printf("opts->outfile = %X\n", opts->outfile );
sv_catpv( ST(0), outfile );
printf("appended ST so end is now %X\n", SvEND(ST(0)));
printf("Now mapfile = %s and opts->outfile = %X\n", (char *)i, opts->outfile);
}
where the struct in question is defined by
typedef struct options t_opts;
...
t_opt opts = ($type) sv_grow( $arg, sizeof(*$var) );
..where..
struct options
{
int cities;
int gridlines;
double zoom;
double xrot;
double yrot;
double zrot;
char* mapfile;
char* outfile;
char* colorfile;
BIT32 desired_categories;
BIT32 desired_continents;
};
And this is what the results are of calling newOptions :
opts->mapfile = 80DC538
Now mapfile = /usr/local/share/rmap/earth.rez -> /usr/local/share/rmap/earth.rez
appending outfile
opts->outfile = 80DC557
appended ST so end is now 80DC567
Now mapfile = /tmp/outfile.gif and opts->outfile = 666967
How is it that opts->outfile goes from 80DC557 to 666967
when all i'm doing is adding onto the end of the SV? Anyone?
thnx in advance,
-Reza
