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#ifndef lint |
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static const char RCSid[] = "$Id: lamps.c,v 2.8 2003/06/07 12:50:20 schorsch 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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|
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#include "copyright.h" |
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|
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <ctype.h> |
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|
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#include "standard.h" |
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#include "color.h" |
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|
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extern char *eindex(), *expsave(); |
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extern FILE *frlibopen(); |
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|
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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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|
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static LAMP *lamps = NULL; /* lamp list */ |
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|
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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} |
