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117 lines
2.1 KiB
C
117 lines
2.1 KiB
C
/*
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* stl.c - STL file reading
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*
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* Written 2014-2015 by Werner Almesberger
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* Copyright 2014-2015 by Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <string.h>
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#include <math.h>
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#include "stl.h"
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#define MAX_LINE 100
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enum state {
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s_init,
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s_facet,
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s_loop,
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s_vertices,
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s_endloop,
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s_endfacet,
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};
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void stl_load_file(FILE *file, void (*facet)(struct v f[3]))
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{
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char buf[MAX_LINE + 1];
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enum state state = s_init;
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struct v f[3];
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int num_v = 0;
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char *s, *e;
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int n = 0;
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int end, got;
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while (fgets(buf, sizeof(buf), file)) {
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n++;
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if (!(n & 1023))
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fprintf(stderr, "%d\r", n);
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for (s = buf; *s && isspace(*s); s++);
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e = strchr(s, 0);
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while (e != s && isspace(e[-1]))
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e--;
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*e = 0;
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end = 0;
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switch (state) {
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case s_init:
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sscanf(s, "solid %*s%n", &end);
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state = s_facet;
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break;
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case s_facet:
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if (!strncmp(s, "endsolid", 8))
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return;
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sscanf(s, "facet normal %*f %*f %*f%n", &end);
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state = s_loop;
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break;
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case s_loop:
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sscanf(s, "outer loop%n", &end);
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state = s_vertices;
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num_v = 0;
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break;
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case s_vertices:
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got = sscanf(s, "vertex %f %f %f%n",
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&f[num_v].x, &f[num_v].y, &f[num_v].z, &end);
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if (got < 3)
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break;
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if (++num_v == 3) {
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facet(f);
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state = s_endloop;
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}
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break;
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case s_endloop:
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sscanf(s, "endloop%n", &end);
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state = s_endfacet;
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break;
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case s_endfacet:
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sscanf(s, "endfacet%n", &end);
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state = s_facet;
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break;
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}
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if (end != e - s) {
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fprintf(stderr, "cannot parse line %d (%d %ld)\n",
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n, end, e - s);
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exit(1);
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}
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}
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fprintf(stderr, "incomplete STL file\n");
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exit(1);
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}
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void stl_load(const char *name, void (*facet)(struct v f[3]))
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{
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FILE *file;
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file = fopen(name, "r");
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if (!file) {
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perror(name);
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exit(1);
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}
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stl_load_file(file, facet);
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fclose(file);
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}
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