needed.c

#include <math.h>
#include "mydefs.h"

double
DEVlimvds(vnew,vold)
    double vnew;
    double vold;

{

    if(vold >= 3.5) {
        if(vnew > vold) {
            vnew = MIN(vnew,(3 * vold) +2);
        } else {
            if (vnew < 3.5) {
                vnew = MAX(vnew,2);
            }
        }
    } else {
        if(vnew > vold) {
            vnew = MIN(vnew,4);
        } else {
            vnew = MAX(vnew,-.5);
        }
    }
    return(vnew);
}
double
DEVpnjlim(vnew,vold,vt,vcrit,icheck)

    double vnew;
    double vold;
    double vt;
    double vcrit;
    int *icheck;

{
    double arg;

    if((vnew > vcrit) && (FABS(vnew - vold) > (vt + vt))) {
        if(vold > 0) {
            arg = 1 + (vnew - vold) / vt;
            if(arg > 0) {
                vnew = vold + vt * log(arg);
            } else {
                vnew = vcrit;
            }
        } else {
            vnew = vt *log(vnew/vt);
        }
        *icheck = 1;
    } else {
        *icheck = 0;
    }
    return(vnew);
}
double
DEVfetlim(vnew,vold,vto)
    double vnew;
    double vold;
    double vto;

{
    double vtsthi;
    double vtstlo;
    double vtox;
    double delv;
    double vtemp;

    vtsthi = FABS(2*(vold-vto))+2;
    vtstlo = vtsthi/2 +2;
    vtox = vto + 3.5;
    delv = vnew-vold;

    if (vold >= vto) {
        if(vold >= vtox) {
            if(delv <= 0) {
                /* going off */
                if(vnew >= vtox) {
                    if(-delv >vtstlo) {
                        vnew =  vold - vtstlo;
                    }
                } else {
                    vnew = MAX(vnew,vto+2);
                }
            } else {
                /* staying on */
                if(delv >= vtsthi) {
                    vnew = vold + vtsthi;
                }
            }
        } else {
            /* middle region */
            if(delv <= 0) {
                /* decreasing */
                vnew = MAX(vnew,vto-.5);
            } else {
                /* increasing */
                vnew = MIN(vnew,vto+4);
            }
        }
    } else {
        /* off */
        if(delv <= 0) {
            if(-delv >vtsthi) {
                vnew = vold - vtsthi;
            } 
        } else {
            vtemp = vto + .5;
            if(vnew <= vtemp) {
                if(delv >vtstlo) {
                    vnew = vold + vtstlo;
                }
            } else {
                vnew = vtemp;
            }
        }
    }
    return(vnew);
}