original files of m241

vxworks-6.9/target/src/libc/stdlib/div.c

@@ -0,0 +1,98 @@
+/* div.c - div file for stdlib  */
+
+/* Copyright 1992-2001 Wind River Systems, Inc. */
+
+/*
+modification history
+--------------------
+01g,25sep01,gls  fixed div_r to check for negative numerator (SPR #30636)
+01f,10feb95,jdi  doc format tweak.
+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 for div()
+01a,19jul92,smb  written and documented.
+*/
+
+/*
+DESCRIPTION
+
+INCLUDE FILES: stdlib.h
+
+SEE ALSO: American National Standard X3.159-1989
+
+NOMANUAL
+*/
+
+#include "vxWorks.h"
+#include "stdlib.h"
+
+/*******************************************************************************
+*
+* div - compute a quotient and remainder (ANSI)
+*
+* This routine computes the quotient and remainder of <numer>/<denom>.
+* If the division is inexact, the resulting quotient is the integer of lesser
+* magnitude that is the nearest to the algebraic quotient.  If the result cannot
+* be represented, the behavior is undefined; otherwise, `quot' * <denom> + `rem'
+* equals <numer>.
+*
+* INCLUDE FILES: stdlib.h 
+*
+* RETURNS:
+* A structure of type `div_t', containing both the quotient and the 
+* remainder. 
+*
+* INTERNAL
+* The structure shall contain the following members, in either order:
+*		int quot; * quotient *
+*		int rem;  * remainder *
+*/
+
+div_t div 
+    (
+    int numer, 		/* numerator */
+    int denom		/* denominator */
+    ) 
+    {
+    static div_t divStruct;	/* div_t structure */
+
+    div_r (numer, denom, &divStruct);
+    return (divStruct);
+    }
+
+/*******************************************************************************
+*
+* div_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 `div_t' structure
+* pointed to by <divStructPtr>.
+*
+* This routine is the reentrant version of div().
+*
+* INCLUDE FILES: stdlib.h 
+*
+* RETURNS: N/A
+*/
+
+void div_r
+    (
+    int     numer,          /* numerator */
+    int     denom,          /* denominator */
+    div_t * divStructPtr    /* div_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;
+        }
+    }