зеркало из https://github.com/github/ruby.git
46 строки
981 B
C
46 строки
981 B
C
/*
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* PROJECT C Library, X68000 PROGRAMMING INTERFACE DEFINITION
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* --------------------------------------------------------------------
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* This file is written by the Project C Library Group, and completely
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* in public domain. You can freely use, copy, modify, and redistribute
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* the whole contents, without this notice.
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* --------------------------------------------------------------------
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* $Id$
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*/
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/* changed 1997.2.2 by K.Okabe */
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/* System headers */
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#include <stdlib.h>
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#include <sys/xstdlib.h>
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/* Functions */
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int _round (char *top, char *cur, int undig)
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{
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char *ptr;
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/* 最後が5未満なら丸めは必要ない */
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if (undig < '5')
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return 0;
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/* ポインタ設定 */
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ptr = cur - 1;
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/* 先頭まで戻りながら丸め処理 */
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while (ptr >= top) {
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/* 繰り上がらなければそれで終わり */
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if (++(*ptr) <= '9')
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return 0;
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/* その桁を0に戻す */
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*ptr-- = '0';
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}
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/* 先頭を1にする */
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*++ptr = '1';
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/* 繰り上がりをしらせる */
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return 1;
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}
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