diff options
author | Nicholas Noll <nbnoll@eml.cc> | 2021-12-05 16:16:21 -0800 |
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committer | Nicholas Noll <nbnoll@eml.cc> | 2021-12-05 16:16:21 -0800 |
commit | 07e77936d535e58b0aeb4f2a11400c1050556739 (patch) | |
tree | fb50fad6436ecbc159505bee73a92cd289b99a07 /src/base/math/floor.c | |
parent | b48327d357e0818d1a6ae2a064cfa7d1567e1242 (diff) |
Feat: added math library
Used Plan9's libc as starting point. This cleans up dangling references
due to loss of libc.
Diffstat (limited to 'src/base/math/floor.c')
-rw-r--r-- | src/base/math/floor.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/src/base/math/floor.c b/src/base/math/floor.c new file mode 100644 index 0000000..60c5ad0 --- /dev/null +++ b/src/base/math/floor.c @@ -0,0 +1,27 @@ +#include <u.h> +#include <base.h> +/* + * floor and ceil-- greatest integer <= arg + * (resp least >=) + */ + +double +math·floor(double d) +{ + double fract; + + if(d < 0) { + fract = math·modf(-d, &d); + if(fract != 0.0) + d += 1; + d = -d; + } else + math·modf(d, &d); + return d; +} + +double +math·ceil(double d) +{ + return -math·floor(-d); +} |