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LAMPS.C
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C/C++ Source or Header
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1993-10-07
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3KB
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145 lines
/* Copyright (c) 1990 Regents of the University of California */
#ifndef lint
static char SCCSid[] = "@(#)lamps.c 2.2 11/10/92 LBL";
#endif
/*
* Load lamp data.
*/
#include <stdio.h>
#include <ctype.h>
extern char *eindex(), *expsave(), *malloc();
extern FILE *fropen();
typedef struct lamp {
char *pattern; /* search pattern */
float *color; /* pointer to lamp value */
struct lamp *next; /* next lamp in list */
} LAMP; /* a lamp entry */
static LAMP *lamps = NULL; /* lamp list */
float *
matchlamp(s) /* see if string matches any lamp */
char *s;
{
register LAMP *lp;
for (lp = lamps; lp != NULL; lp = lp->next) {
expset(lp->pattern);
if (eindex(s) != NULL)
return(lp->color);
}
return(NULL);
}
loadlamps(file) /* load lamp type file */
char *file;
{
LAMP *lastp;
register LAMP *lp;
FILE *fp;
float xyz[3];
char buf[128], str[128];
register char *cp1, *cp2;
if ((fp = fropen(file)) == NULL)
return(0);
lastp = NULL;
while (fgets(buf, sizeof(buf), fp) != NULL) {
/* work on a copy of buffer */
strcpy(str, buf);
/* get pattern for this entry */
for (cp1 = str; isspace(*cp1); cp1++)
;
if (!*cp1 || *cp1 == '#')
continue;
for (cp2 = cp1+1; *cp2; cp2++)
if (*cp2 == *cp1 && cp2[-1] != '\\')
break;
if (!*cp2) {
cp1 = "unclosed pattern";
goto fmterr;
}
cp1++; *cp2++ = '\0';
if (ecompile(cp1, 1, 0) < 0) {
cp1 = "bad regular expression";
goto fmterr;
}
if ((lp = (LAMP *)malloc(sizeof(LAMP))) == NULL)
goto memerr;
if ((lp->pattern = expsave()) == NULL)
goto memerr;
/* get specification */
for (cp1 = cp2; isspace(*cp1); cp1++)
;
if (!isdigit(*cp1) && *cp1 != '.' && *cp1 != '(') {
cp1 = "missing lamp specification";
goto fmterr;
}
if (*cp1 == '(') { /* find alias */
for (cp2 = ++cp1; *cp2; cp2++)
if (*cp2 == ')' && cp2[-1] != '\\')
break;
*cp2 = '\0';
if ((lp->color = matchlamp(cp1)) == NULL) {
cp1 = "unmatched alias";
goto fmterr;
}
} else { /* or read specificaion */
if ((lp->color=(float *)malloc(3*sizeof(float)))==NULL)
goto memerr;
if (sscanf(cp1, "%f %f %f", &lp->color[0], &
lp->color[1], &lp->color[2]) != 3) {
cp1 = "bad lamp data";
goto fmterr;
}
/* convert xyY to XYZ */
xyz[1] = lp->color[2];
xyz[0] = lp->color[0]/lp->color[1] * xyz[1];
xyz[2] = xyz[1]*(1./lp->color[1] - 1.) - xyz[0];
/* XYZ to RGB */
cie_rgb(lp->color, xyz);
}
if (lastp == NULL)
lamps = lp;
else
lastp->next = lp;
lp->next = NULL;
lastp = lp;
}
fclose(fp);
return(lastp != NULL);
memerr:
fputs("Out of memory in loadlamps\n", stderr);
return(-1);
fmterr:
fputs(buf, stderr);
fprintf(stderr, "%s: %s\n", file, cp1);
return(-1);
}
freelamps() /* free our lamps list */
{
register LAMP *lp1, *lp2;
for (lp1 = lamps; lp1 != NULL; lp1 = lp2) {
free(lp1->pattern);
if (lp1->color != NULL) {
for (lp2 = lp1->next; lp2 != NULL; lp2 = lp2->next)
if (lp2->color == lp1->color)
lp2->color = NULL;
free((char *)lp1->color);
}
lp2 = lp1->next;
free((char *)lp1);
}
lamps = NULL;
}