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#ifndef lint
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static const char RCSid[] = "$Id: resolu.c,v 2.8 2023/06/21 15:43:16 greg Exp $";
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#endif
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/*
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* Read and write image resolutions.
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*
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* Externals declared in resolu.h
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*/
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#include "copyright.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include "resolu.h"
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char resolu_buf[RESOLU_BUFLEN]; /* resolution line buffer */
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void
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fputresolu( /* put out picture dimensions */
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int ord, /* scanline ordering */
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int sl, int ns, /* scanline length and number */
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FILE *fp
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)
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{
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RESOLU rs;
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if ((rs.rt = ord) & YMAJOR) {
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rs.xr = sl;
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rs.yr = ns;
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} else {
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rs.xr = ns;
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rs.yr = sl;
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}
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fputsresolu(&rs, fp);
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}
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int
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fgetresolu( /* get picture dimensions */
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int *sl, int *ns, /* scanline length and number */
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FILE *fp
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)
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{
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RESOLU rs;
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if (!fgetsresolu(&rs, fp))
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return(-1);
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if (rs.rt & YMAJOR) {
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*sl = rs.xr;
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*ns = rs.yr;
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} else {
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*sl = rs.yr;
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*ns = rs.xr;
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}
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return(rs.rt);
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}
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char *
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resolu2str( /* convert resolution struct to line */
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char *buf,
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RESOLU *rp
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)
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{
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if (rp->rt&YMAJOR)
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sprintf(buf, "%cY %8d %cX %8d\n",
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rp->rt&YDECR ? '-' : '+', rp->yr,
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rp->rt&XDECR ? '-' : '+', rp->xr);
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else
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sprintf(buf, "%cX %8d %cY %8d\n",
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rp->rt&XDECR ? '-' : '+', rp->xr,
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rp->rt&YDECR ? '-' : '+', rp->yr);
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return(buf);
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}
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int
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str2resolu( /* convert resolution line to struct */
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RESOLU *rp,
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char *buf
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)
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{
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char *xndx, *yndx;
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char *cp;
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if (buf == NULL)
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return(0);
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xndx = yndx = NULL;
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for (cp = buf; *cp; cp++)
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if (*cp == 'X')
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xndx = cp;
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else if (*cp == 'Y')
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yndx = cp;
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if (xndx == NULL || yndx == NULL)
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return(0);
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rp->rt = 0;
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if (xndx > yndx) rp->rt |= YMAJOR;
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if (xndx[-1] == '-') rp->rt |= XDECR;
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if (yndx[-1] == '-') rp->rt |= YDECR;
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if ((rp->xr = atoi(xndx+1)) <= 0)
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return(0);
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if ((rp->yr = atoi(yndx+1)) <= 0)
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return(0);
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return(1);
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}
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