ldiv.c
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上传日期:2007-01-17
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文件大小:2k
- /* ldiv.c - ldiv file for stdlib */
- /* Copyright 1992-2001 Wind River Systems, Inc. */
- /*
- modification history
- --------------------
- 01f,25sep01,gls fixed ldiv_r to check for negative numerator (SPR #30636)
- 01e,08feb93,jdi documentation cleanup for 5.1.
- 01d,20sep92,smb documentation additions.
- 01c,24jul92,smb corrected parameter ordering.
- 01b,24jul92,smb added reentrant version of ldiv()
- 01a,19jul92,smb written.
- */
- /*
- DESCRIPTION
- INCLUDE FILES: stdlib.h
- SEE ALSO: American National Standard X3.159-1989
- NOMANUAL
- */
- #include "vxWorks.h"
- #include "stdlib.h"
- /*******************************************************************************
- *
- * ldiv - compute the quotient and remainder of the division (ANSI)
- *
- * This routine computes the quotient and remainder of <numer>/<denom>.
- * This routine is similar to div(), except that the arguments and the
- * elements of the returned structure are all of type `long'.
- *
- * INCLUDE FILES: stdlib.h
- *
- * RETURNS:
- * A structure of type `ldiv_t', containing both the quotient and the
- * remainder.
- */
- ldiv_t ldiv
- (
- long numer, /* numerator */
- long denom /* denominator */
- )
- {
- static ldiv_t divStruct;
- ldiv_r (numer, denom, &divStruct);
- return (divStruct);
- }
-
- /*******************************************************************************
- *
- * ldiv_r - compute a quotient and remainder (reentrant)
- *
- * This routine computes the quotient and remainder of <numer>/<denom>.
- * The quotient and remainder are stored in the `ldiv_t' structure
- * `divStructPtr'.
- *
- * This routine is the reentrant version of ldiv().
- *
- * INCLUDE FILES: stdlib.h
- *
- * RETURNS: N/A
- */
- void ldiv_r
- (
- long numer, /* numerator */
- long denom, /* denominator */
- ldiv_t * divStructPtr /* ldiv_t structure */
- )
- {
- /* calculate quotient */
- divStructPtr->quot = numer / denom;
-
- /* calculate remainder */
- divStructPtr->rem = numer - (denom * divStructPtr->quot);
- /* check for negative numerator */
- if ((numer < 0) && (divStructPtr->rem > 0))
- {
- divStructPtr->quot++;
- divStructPtr->rem -= denom;
- }
- }