Category : C Source Code
Archive   : SDB.ZIP
Filename : QSORT.C

 
Output of file : QSORT.C contained in archive : SDB.ZIP
/* qsort - quick sort routine */

/* translated to C from the 'Software Tools in Pascal' routines
by Kernighan & Plauger
*/

/* qsort - quick sort routine */
qsort(linepos,nlines,cmprec)
char *linepos[]; int nlines; int (*cmprec)();
{
qsort1(linepos,0,nlines-1,cmprec);
}

/* qsort1 - the real sort routine */
static qsort1(linepos,lo,hi,cmprec)
char *linepos[]; int lo,hi; int (*cmprec)();
{
char *pivline;
int i,j;

/* make sure there's something to sort */
if (lo >= hi)
return;

/* initialize */
i = lo;
j = hi;
pivline = linepos[j];

/* partition the set */
do {
while (i < j && (*cmprec)(linepos[i],pivline) <= 0)
i++;
while (j > i && (*cmprec)(linepos[j],pivline) >= 0)
j--;
if (i < j)
exchange(linepos,i,j);
} while (i < j);

/* move pivot to i */
exchange(linepos,i,hi);

/* sort each partition */
if (i - lo < hi - i) {
qsort1(linepos,lo,i-1,cmprec);
qsort1(linepos,i+1,hi,cmprec);
}
else {
qsort1(linepos,i+1,hi,cmprec);
qsort1(linepos,lo,i-1,cmprec);
}
}

/* exchange - exchange two lines */
static exchange(linepos,l1,l2)
char *linepos[]; int l1,l2;
{
char *tmp;

tmp = linepos[l1];
linepos[l1] = linepos[l2];
linepos[l2] = tmp;
}


  3 Responses to “Category : C Source Code
Archive   : SDB.ZIP
Filename : QSORT.C

  1. Very nice! Thank you for this wonderful archive. I wonder why I found it only now. Long live the BBS file archives!

  2. This is so awesome! 😀 I’d be cool if you could download an entire archive of this at once, though.

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