#include <stdio.h>char* line = NULL;unsigned int vertexc, normalc, texturec, facec; /* we use this to count the vertexes etc. */size_t len = 0; /* the size of line */size_t read = 0; /* how many chars read */File* f = fopen(filename);if (f == NULL) {  /* couldn't open the file */  return; /* probably want to report it to) */}/* firstpass */while ((read = getline(&line, &len, fp)) != -1) {  if (line[0] == 'v') {    if (line[1] == ' ') { /* line starts with v => vertex */      vertexc++;    } else if (line[1] == 't' { /* vt => texture */      texturec++;    } else if (line[1] == 'n' { /* vn => vertex normal */      normalc++;    }  } else if (line[0] == 'f' && line[1] == ' ') {    facec++;  }}rewind(f); /* go to start of file again *//* now you know how many vertexes, etc you have. Allocate your data structures that will hold your model and just do the same thing again this time yousing sscanf with an apropriate format string to read the data (i.e. "v %f %f %f" for a vertex). I leave this as an excercise *//* second pass ... */fclose(f); /* close the file */