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/* Copyright (c) 1986 Regents of the University of California */
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#ifndef lint
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static char SCCSid[] = "$SunId$ LBL";
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#endif
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/*
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* xf.c - routines to convert transform arguments into 4X4 matrix.
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*
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* 1/28/86
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*/
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#define PI 3.14159265358979323846
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#define checkarg(a,n) if (strcmp(av[i],a) || i+n >= ac) goto done
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int
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xf(retmat, retsca, ac, av) /* get transform specification */
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double retmat[4][4];
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double *retsca;
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int ac;
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char *av[];
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{
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double atof(), sin(), cos();
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double xfmat[4][4], m4[4][4];
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double xfsca, theta;
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int i, icnt;
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setident4(retmat);
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*retsca = 1.0;
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setident4(xfmat);
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xfsca = 1.0;
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for (i = 0; i < ac && av[i][0] == '-'; i++) {
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setident4(m4);
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switch (av[i][1]) {
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case 't': /* translate */
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checkarg("-t",3);
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m4[3][0] = atof(av[++i]);
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m4[3][1] = atof(av[++i]);
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m4[3][2] = atof(av[++i]);
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break;
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case 'r': /* rotate */
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switch (av[i][2]) {
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case 'x':
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checkarg("-rx",1);
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theta = PI/180.0 * atof(av[++i]);
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m4[1][1] = m4[2][2] = cos(theta);
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m4[2][1] = -(m4[1][2] = sin(theta));
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break;
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case 'y':
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checkarg("-ry",1);
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theta = PI/180.0 * atof(av[++i]);
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m4[0][0] = m4[2][2] = cos(theta);
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m4[0][2] = -(m4[2][0] = sin(theta));
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break;
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case 'z':
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checkarg("-rz",1);
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theta = PI/180.0 * atof(av[++i]);
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m4[0][0] = m4[1][1] = cos(theta);
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m4[1][0] = -(m4[0][1] = sin(theta));
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break;
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default:
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return(i);
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}
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break;
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case 's': /* scale */
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checkarg("-s",1);
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xfsca *=
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m4[0][0] =
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m4[1][1] =
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m4[2][2] = atof(av[++i]);
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break;
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case 'm': /* mirror */
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switch (av[i][2]) {
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case 'x':
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checkarg("-mx",0);
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xfsca *=
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m4[0][0] = -1.0;
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break;
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case 'y':
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checkarg("-my",0);
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xfsca *=
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m4[1][1] = -1.0;
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break;
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case 'z':
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checkarg("-mz",0);
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xfsca *=
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m4[2][2] = -1.0;
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break;
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default:
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return(i);
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}
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break;
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case 'i': /* iterate */
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checkarg("-i",1);
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icnt = atoi(av[++i]);
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while (icnt-- > 0) {
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multmat4(retmat, retmat, xfmat);
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*retsca *= xfsca;
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}
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setident4(xfmat);
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xfsca = 1.0;
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break;
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default:
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return(i);
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}
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multmat4(xfmat, xfmat, m4);
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}
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done:
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multmat4(retmat, retmat, xfmat);
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*retsca *= xfsca;
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return(i);
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}
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#ifdef INVXF
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int
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invxf(retmat, retsca, ac, av) /* invert transform specification */
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double retmat[4][4];
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double *retsca;
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int ac;
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char *av[];
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{
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double atof(), sin(), cos();
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double xfmat[4][4], m4[4][4];
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double xfsca, theta;
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int i, icnt;
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setident4(retmat);
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*retsca = 1.0;
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setident4(xfmat);
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xfsca = 1.0;
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for (i = 0; i < ac && av[i][0] == '-'; i++) {
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setident4(m4);
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switch (av[i][1]) {
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case 't': /* translate */
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checkarg("-t",3);
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m4[3][0] = -atof(av[++i]);
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m4[3][1] = -atof(av[++i]);
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m4[3][2] = -atof(av[++i]);
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break;
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case 'r': /* rotate */
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switch (av[i][2]) {
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case 'x':
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checkarg("-rx",1);
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theta = -PI/180.0 * atof(av[++i]);
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m4[1][1] = m4[2][2] = cos(theta);
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m4[2][1] = -(m4[1][2] = sin(theta));
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break;
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case 'y':
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checkarg("-ry",1);
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theta = -PI/180.0 * atof(av[++i]);
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m4[0][0] = m4[2][2] = cos(theta);
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m4[0][2] = -(m4[2][0] = sin(theta));
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break;
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case 'z':
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checkarg("-rz",1);
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theta = -PI/180.0 * atof(av[++i]);
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m4[0][0] = m4[1][1] = cos(theta);
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m4[1][0] = -(m4[0][1] = sin(theta));
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break;
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default:
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return(i);
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}
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break;
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case 's': /* scale */
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checkarg("-s",1);
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xfsca *=
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m4[0][0] =
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m4[1][1] =
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m4[2][2] = 1.0 / atof(av[++i]);
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break;
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case 'm': /* mirror */
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switch (av[i][2]) {
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case 'x':
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checkarg("-mx",0);
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xfsca *=
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m4[0][0] = -1.0;
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break;
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case 'y':
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checkarg("-my",0);
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xfsca *=
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m4[1][1] = -1.0;
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break;
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case 'z':
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checkarg("-mz",0);
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xfsca *=
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m4[2][2] = -1.0;
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break;
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default:
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return(i);
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}
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break;
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case 'i': /* iterate */
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checkarg("-i",1);
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icnt = atoi(av[++i]);
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while (icnt-- > 0) {
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multmat4(retmat, xfmat, retmat);
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*retsca *= xfsca;
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}
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setident4(xfmat);
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xfsca = 1.0;
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break;
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default:
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return(i);
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}
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multmat4(xfmat, m4, xfmat); /* left multiply */
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}
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done:
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multmat4(retmat, xfmat, retmat);
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*retsca *= xfsca;
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return(i);
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}
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#endif
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