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/* splitfont: extract characters from font */
/* this is for iso fonts, no psf header, just 256 characters */
#include <stdio.h>
#include <stdlib.h>
#include <string.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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