More fun with SAN [OLD #20]

[MichaelChirico]

Getting this:

geohash.cpp:462:37: runtime error: shift exponent 64 is too large for 32-bit type 'int'
    #0 0x7fd076af8b6b in geohash_decode_impl /data/gannet/ripley/R/packages/tests-gcc-SAN/geohashTools/src/geohash.cpp:462
    #1 0x7fd076af8b6b in geohash_decode(char*, unsigned long, double*, double*, double*, double*, int, int) /data/gannet/ripley/R/packages/tests-gcc-SAN/geohashTools/src/geohash.cpp:473
    #2 0x7fd076b54d0f in gh_decode_(Rcpp::Vector<16, Rcpp::PreserveStorage>, bool, int) /data/gannet/ripley/R/packages/tests-gcc-SAN/geohashTools/src/geohash.cpp:543
    #3 0x7fd076b025bf in _geohashTools_gh_decode_ /data/gannet/ripley/R/packages/tests-gcc-SAN/geohashTools/src/RcppExports.cpp:30

Seems to come from:

gh_decode(paste(rep("1", 26L), collapse = ""))

because length = 26 and ((5*length - (length %% 2)) %/%2 - 1) here:

*delta_latitude = 45.0/(double) (1 << ((5*length - (length % 2))/2 - 1));

But 1 is implicitly int which can't handle 64-bit input. Need to use a 64-bit integer instead.

Closed in 73ea7aa