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| author | ultramage <ultramage@54d463be-8e91-2dee-dedb-b68131a5f0ec> | 2008-05-01 12:14:06 +0000 |
|---|---|---|
| committer | ultramage <ultramage@54d463be-8e91-2dee-dedb-b68131a5f0ec> | 2008-05-01 12:14:06 +0000 |
| commit | 5524938f8650e659b3c838df44212de56bf72584 (patch) | |
| tree | 9696c2ef858b4ebd81eda804389f8ece788a994b /src/common/utils.c | |
| parent | 3bba210cc5151bfc2971be296ab5c4391ea28639 (diff) | |
| download | hercules-5524938f8650e659b3c838df44212de56bf72584.tar.gz hercules-5524938f8650e659b3c838df44212de56bf72584.tar.bz2 hercules-5524938f8650e659b3c838df44212de56bf72584.tar.xz hercules-5524938f8650e659b3c838df44212de56bf72584.zip | |
Implemented get_percentage() for compact and safe calculation of percentual values.
Fixed integer arithmetic overflows that were occuring in several supernovice checks (bugreport:1135).
git-svn-id: https://rathena.svn.sourceforge.net/svnroot/rathena/trunk@12679 54d463be-8e91-2dee-dedb-b68131a5f0ec
Diffstat (limited to 'src/common/utils.c')
| -rw-r--r-- | src/common/utils.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/src/common/utils.c b/src/common/utils.c index 354bd3814..a9ce1389f 100644 --- a/src/common/utils.c +++ b/src/common/utils.c @@ -221,3 +221,19 @@ uint32 MakeDWord(uint16 word0, uint16 word1) ( (uint32)(word0 ) )| ( (uint32)(word1 << 0x10) ); } + + +/// calculates the value of A / B, in percent (rounded down) +unsigned int percent(const unsigned int A, const unsigned int B) +{ + if( B == 0 ) + { + ShowError("percent(): divison by zero!\n"); + return -1; + } + + if( A < UINT_MAX/100 ) + return 100*A/B; + else + return A/(B/100); +}
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