source: buchla-68k/orig/GP/TESTCQ.C

/*
   =============================================================================
        testcq.c -- test the character queue functions
        Version 1 -- 1988-11-02 -- D.N. Lynx Crowe
   =============================================================================
*/

#include "stdio.h"
#include "stddefs.h"
#include "charq.h"

#define QSIZE   128                     /* queue length (characters) for testing */

#define QLO     (QSIZE >> 2)            /* lo water mark = 1/4 queue length */
#define QHI     (QSIZE - QLO)           /* hi water mark = 3/4 queue length */

/*
   =============================================================================
        Test the character queue functions
   =============================================================================
*/

struct charq    queue1;

char    chars[QSIZE];

char    rs;

main(argc, argv)
int argc;
char *argv[];
{
        register struct charq *qp;
        register unsigned short i, qsiz;
        register short rc;

        qp = &queue1;

        printf("Initializing queue:  size = %u, lo water = %u, hi water = %u\n",
                QSIZE, QLO, QHI);

        if (QSIZE NE (qsiz = setcq(qp, chars, QSIZE, QHI, QLO))) {

                printf("ERROR -- setcq() returned %u\n", qsiz);
                exit(1);
        }

        printf("Filling queue of length %u with %u entries\n",
                QSIZE, QSIZE + 2);

        for (i = 0; i < QSIZE + 2; i++) {       /* fill queue to overflow */

                if (rc = putcq(qp, i))
                        printf("putcq() returned %d on entry %u\n",
                                rc, i);
        }

        printf("Queue $%08.8lx:  size = %u, len = %u, in = %u, out = %u\n",
                qp, qp->qsize, qp->qlen, qp->qin, qp->qout);

        printf("Emptying queue of length %u for %u entries\n",
                QSIZE, QSIZE + 2);

        for (i = 0; i < QSIZE + 2; i++) {       /* empty queue to underflow */

                if (rc = getcq(qp, &rs))
                        printf("getcq() returned %d on entry %u\n",
                                rc, i);

                if ((rs NE i) AND (i < QSIZE))
                        printf("ERROR -- value %u should have been %u\n",
                                rs, i);
        }

        exit(0);
}