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#ifndef lint
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static const char RCSid[] = "$Id: lamps.c,v 2.10 2008/02/18 23:35:51 greg Exp $";
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#endif
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/*
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* Load lamp data.
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*/
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#include "copyright.h"
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#include <ctype.h>
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#include "standard.h"
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#include "paths.h"
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#include "color.h"
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extern char *eindex(), *expsave();
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typedef struct lamp {
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char *pattern; /* search pattern */
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float *color; /* pointer to lamp value */
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struct lamp *next; /* next lamp in list */
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} LAMP; /* a lamp entry */
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static LAMP *lamps = NULL; /* lamp list */
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float *
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matchlamp( /* see if string matches any lamp */
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char *s
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)
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{
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register LAMP *lp;
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for (lp = lamps; lp != NULL; lp = lp->next) {
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expset(lp->pattern);
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if (eindex(s) != NULL)
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return(lp->color);
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}
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return(NULL);
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}
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int
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loadlamps( /* load lamp type file */
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char *file
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)
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{
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LAMP *lastp;
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register LAMP *lp;
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FILE *fp;
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float xyz[3];
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char buf[128], str[128];
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register char *cp1, *cp2;
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if ((fp = frlibopen(file)) == NULL)
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return(0);
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lastp = NULL;
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while (fgets(buf, sizeof(buf), fp) != NULL) {
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/* work on a copy of buffer */
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strcpy(str, buf);
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/* get pattern for this entry */
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for (cp1 = str; isspace(*cp1); cp1++)
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;
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if (!*cp1 || *cp1 == '#')
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continue;
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for (cp2 = cp1+1; *cp2; cp2++)
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if (*cp2 == *cp1 && cp2[-1] != '\\')
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break;
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if (!*cp2) {
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cp1 = "unclosed pattern";
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goto fmterr;
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}
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cp1++; *cp2++ = '\0';
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if (ecompile(cp1, 1, 0) < 0) {
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cp1 = "bad regular expression";
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goto fmterr;
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}
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if ((lp = (LAMP *)malloc(sizeof(LAMP))) == NULL)
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goto memerr;
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if ((lp->pattern = expsave()) == NULL)
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goto memerr;
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/* get specification */
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for (cp1 = cp2; isspace(*cp1); cp1++)
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;
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if (!isdigit(*cp1) && *cp1 != '.' && *cp1 != '(') {
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cp1 = "missing lamp specification";
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goto fmterr;
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}
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if (*cp1 == '(') { /* find alias */
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for (cp2 = ++cp1; *cp2; cp2++)
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if (*cp2 == ')' && cp2[-1] != '\\')
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break;
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*cp2 = '\0';
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if ((lp->color = matchlamp(cp1)) == NULL) {
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cp1 = "unmatched alias";
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goto fmterr;
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}
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} else { /* or read specificaion */
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if ((lp->color=(float *)malloc(6*sizeof(float)))==NULL)
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goto memerr;
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if (sscanf(cp1, "%f %f %f", &lp->color[3], &
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lp->color[4], &lp->color[5]) != 3) {
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cp1 = "bad lamp data";
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goto fmterr;
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}
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/* convert xyY to XYZ */
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xyz[1] = lp->color[5];
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xyz[0] = lp->color[3]/lp->color[4] * xyz[1];
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xyz[2] = xyz[1]*(1./lp->color[4] - 1.) - xyz[0];
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/* XYZ to RGB */
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cie_rgb(lp->color, xyz);
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}
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if (lastp == NULL)
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lamps = lp;
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else
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lastp->next = lp;
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lp->next = NULL;
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lastp = lp;
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}
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fclose(fp);
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return(lastp != NULL);
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memerr:
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fputs("Out of memory in loadlamps\n", stderr);
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return(-1);
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fmterr:
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fputs(buf, stderr);
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fprintf(stderr, "%s: %s\n", file, cp1);
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return(-1);
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}
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void
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freelamps(void) /* free our lamps list */
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{
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register LAMP *lp1, *lp2;
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for (lp1 = lamps; lp1 != NULL; lp1 = lp2) {
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free(lp1->pattern);
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if (lp1->color != NULL) {
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for (lp2 = lp1->next; lp2 != NULL; lp2 = lp2->next)
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if (lp2->color == lp1->color)
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lp2->color = NULL;
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free((void *)lp1->color);
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}
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lp2 = lp1->next;
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free((void *)lp1);
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}
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lamps = NULL;
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}
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