/usr/share/doc/libsuperlu-dev/tests/MATGEN/d_sign.c is in libsuperlu3-dev 3.0+20070106-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | #include "f2c.h"
#ifdef KR_headers
double d_sign(a,b) doublereal *a, *b;
#else
double d_sign(doublereal *a, doublereal *b)
#endif
{
double x;
x = (*a >= 0 ? *a : - *a);
return( *b >= 0 ? x : -x);
}
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