Trying to copy the (binary) header of a input file directly to an output file, I've had repeatable seg faults. The call:
writeChar(hdr, outfh, nchars=6144) when hdr just contains one empty string seems to be the culprit. The stack traces weren't all that illuminating, with sig 11 in memory-related functions following this. But in src/main/connections.c it looks like do_writechar doesn't check the length of strings when given an explicit nchars argument; so I think the strncpy() call will read too far. [This happened because I didn't remember that R lets null terminate strings; so I did a readChar(infh, nchars=6144) through some nulls at the start of the header, and ended up with a much shorter string than I was expecting. As far as I can tell do_readchar still behaves in these circumstances, and in any case I can produce the fault without it.] Using readBin and writeBin with integer() and size=1 seems to be the solution for header copying, but the faults still seemed worth reporting. I'm currently using R 1.8.0 on NetBSD/i386 1.6.1. Mark <>< ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-devel
