diff options
author | yugui <yugui@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2008-08-25 15:02:05 +0000 |
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committer | yugui <yugui@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2008-08-25 15:02:05 +0000 |
commit | 0dc342de848a642ecce8db697b8fecd83a63e117 (patch) | |
tree | 2b7ed4724aff1f86073e4740134bda9c4aac1a39 /trunk/x68/_round.c | |
parent | ef70cf7138ab8034b5b806f466e4b484b24f0f88 (diff) |
added tag v1_9_0_4
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/tags/v1_9_0_4@18845 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'trunk/x68/_round.c')
-rw-r--r-- | trunk/x68/_round.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/trunk/x68/_round.c b/trunk/x68/_round.c new file mode 100644 index 0000000000..761930fb8c --- /dev/null +++ b/trunk/x68/_round.c @@ -0,0 +1,45 @@ +/* + * PROJECT C Library, X68000 PROGRAMMING INTERFACE DEFINITION + * -------------------------------------------------------------------- + * This file is written by the Project C Library Group, and completely + * in public domain. You can freely use, copy, modify, and redistribute + * the whole contents, without this notice. + * -------------------------------------------------------------------- + * $Id$ + */ +/* changed 1997.2.2 by K.Okabe */ + +/* System headers */ +#include <stdlib.h> +#include <sys/xstdlib.h> + +/* Functions */ +int _round (char *top, char *cur, int undig) +{ + char *ptr; + + /* 最後が5未満なら丸めは必要ない */ + if (undig < '5') + return 0; + + /* ポインタ設定 */ + ptr = cur - 1; + + /* 先頭まで戻りながら丸め処理 */ + while (ptr >= top) { + + /* 繰り上がらなければそれで終わり */ + if (++(*ptr) <= '9') + return 0; + + /* その桁を0に戻す */ + *ptr-- = '0'; + + } + + /* 先頭を1にする */ + *++ptr = '1'; + + /* 繰り上がりをしらせる */ + return 1; +} |