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authorRob Landley2006-05-09 23:14:39 +0000
committerRob Landley2006-05-09 23:14:39 +0000
commitf893250a3be0ca1f63cec7e1bd6cd4a5a8914508 (patch)
tree70394e4ab58e089fb53a54f6c8b24cf0101f93ef /coreutils
parentc503df5bdda79ee9ed755325c0d76350a7a719c8 (diff)
downloadbusybox-f893250a3be0ca1f63cec7e1bd6cd4a5a8914508.zip
busybox-f893250a3be0ca1f63cec7e1bd6cd4a5a8914508.tar.gz
Replace isnan() and isinf() with inline tests so uClibc doesn't want us to
link sort against libm. This adds 22 bytes for glibc but is a win for uClibc, and since glibc is bigger than all of busybox it seems kind of silly to worry about it.
Diffstat (limited to 'coreutils')
-rw-r--r--coreutils/sort.c14
1 files changed, 8 insertions, 6 deletions
diff --git a/coreutils/sort.c b/coreutils/sort.c
index 60fc952..fb58f62 100644
--- a/coreutils/sort.c
+++ b/coreutils/sort.c
@@ -176,12 +176,14 @@ static int compare_keys(const void *xarg, const void *yarg)
/* not numbers < NaN < -infinity < numbers < +infinity) */
if(x==xx) retval=(y==yy ? 0 : -1);
else if(y==yy) retval=1;
- else if(isnan(dx)) retval=isnan(dy) ? 0 : -1;
- else if(isnan(dy)) retval=1;
- else if(isinf(dx)) {
- if(dx<0) retval=((isinf(dy) && dy<0) ? 0 : -1);
- else retval=((isinf(dy) && dy>0) ? 0 : 1);
- } else if(isinf(dy)) retval=dy<0 ? 1 : -1;
+ /* Check for isnan */
+ else if(dx != dx) retval = (dy != dy) ? 0 : -1;
+ else if(dy != dy) retval = 1;
+ /* Check for infinity. Could underflow, but it avoids libm. */
+ else if(1.0/dx == 0.0) {
+ if(dx<0) retval=((1.0/dy == 0.0 && dy<0) ? 0 : -1);
+ else retval=((1.0/dy == 0.0 && dy>0) ? 0 : 1);
+ } else if(1.0/dy == 0.0) retval=dy<0 ? 1 : -1;
else retval=dx>dy ? 1 : (dx<dy ? -1 : 0);
break;
}