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splitfont.c

/* splitfont: extract characters from font */
/* this is for iso fonts, no psf header, just 256 characters */

#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/stat.h>

void
dosplit (int from, int to, char *fontbuf, int size, char *fontfile) {
      int itemsize = size/256;
      int i, fd;
      char *p, *q, s;
      char filename[4096];

      if (from < 0 || from > 255 || to < 0 || to > 255) {
            fprintf(stderr, "splitfont: bad argument %s,%s\n",
                  from, to);
            exit(1);
      }
      if(strlen(fontfile) >= sizeof(filename)-4) {
            fprintf(stderr, "splitfont: ridiculously long name\n");
            exit(1);
      }
      while (from <= to) {
            sprintf(filename, "%s.%02x", fontfile, from);
            if ((fd = open(filename, O_WRONLY|O_CREAT, 0666)) < 0) {
                  perror("splitfont");
                  fprintf(stderr, "cannot open %s for writing\n", filename);
            }
            p = &fontbuf[from*itemsize];
            if (write(fd, p, itemsize) != itemsize) {
                  perror("splitfont");
                  fprintf(stderr, "error writing %s\n", filename);
            }
            close(fd);
            from++;
      }
}

int main(int argc, char **argv) {
      struct stat statbuf;
      char fontbuf[4096];
      int fd;
      char *p, *q;
      int from, to;

      if (argc != 3) {
            fprintf(stderr, "call: splitfont fontfile 17,23-30,...\n");
            exit(1);
      }
      if (stat(argv[1], &statbuf)) {
            perror("splitfont");
            fprintf(stderr, "cannot stat fontfile %s", argv[1]);
            exit(1);
      }
      if (statbuf.st_size > 4096) {
            fprintf(stderr, "splitfont: file unexpectedly large\n");
            exit(1);
      }
      if (statbuf.st_size % 256) {
            fprintf(stderr, "splitfont: file size not a multiple of 256\n");
            exit(1);
      }
      if ((fd = open(argv[1], O_RDONLY)) < 0) {
            perror("splitfont");
            fprintf(stderr, "cannot open fontfile %s", argv[1]);
            exit(1);
      }
      if (read(fd, fontbuf, statbuf.st_size) != statbuf.st_size) {
            perror("splitfont");
            fprintf(stderr, "error reading fontfile %s", argv[1]);
            exit(1);
      }

      p = argv[2];
      while(1) {
            to = from = strtoul(p,&q,0);
            if(*q == '-') {
                  p = q+1;
                  to = strtoul(p,&q,0);
            }
            if(*q && *q != ',') {
                  fprintf(stderr, "splitfont: garbage in %s\n", p);
                  exit(1);
            }
            dosplit(from, to, fontbuf, statbuf.st_size, argv[1]);
            if (!*q)
                  break;
            p = q+1;
      }
      return 0;
}

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