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#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <string.h>
#include <locale.h>
#include <limits.h>
#include <wchar.h>
#define BITS_NO (65536l / 32)
u_int32_t used[BITS_NO];
void
usage (void)
{
printf ("usage: reduce-font <font> < text\n");
}
static inline size_t
bits (u_int32_t x)
{
size_t r;
for (r = 0 ; x != 0 ; r++)
x = x & (x - 1);
return r;
}
void
test (u_int32_t x)
{
int i;
size_t l = bits (x);
printf ("%08x: ", x);
for (i = 0 ; i < 32 ; x <<= 1, ++i)
putchar (x & 0x80000000 ? '1' : '0');
printf (": %zu\n", l);
}
int
main (int argc, char **argv)
{
FILE *font;
char *buffer = NULL;
char *locale = setlocale (LC_CTYPE, "");
int error = 0;
if (locale == NULL) {
fprintf (stderr, "Unable to set locale\n");
return 1;
}
fprintf (stderr, "setlocale: %s\n", locale);
#if 1
fprintf (stderr, "FYI: MB_CUR_MAX/MB_LEN_MAX: %zu/%d\n", MB_CUR_MAX, MB_LEN_MAX);
#endif
if (argc != 2)
usage ();
else if ((buffer = (char *)malloc (MB_LEN_MAX)) == NULL)
perror ("buffer allocation");
else if ((font = fopen (argv[1], "r")) == NULL)
perror (argv[1]);
else
{
size_t got, avail, chars, pos;
int i;
wchar_t wc;
mbstate_t wstate = { 0 };
/* Initialize the array */
/* Make sure ASCII is included! */
for (i = 0 ; i < (128 / 32) ; ++i)
used[i] = UINT_MAX;
/* Other stuff will only be included iff it's there... :) */
for (; i < BITS_NO ; ++i)
used[i] = 0;
mbrtowc (NULL, NULL, 0, &wstate); /* Init the engine */
for (pos = avail = 0 ; (got = fread (buffer + avail, 1, MB_LEN_MAX - avail, stdin)) >= 0 && (avail += got) > 0 ;)
{
switch (got = mbrtowc (&wc, buffer, avail, &wstate))
{
case -1: /* An error occured */
fprintf (stderr, "error -1 at position %ld (bytes: %zu %*.*s)\n", pos, avail, (int) avail, (int) avail, buffer);
error = 1;
break;
case -2:
fprintf (stderr, "-2: bytes: %zu %*.*s\n", avail, (int) avail, (int) avail, buffer);
continue;
case 0: /* Nothing's read so far */
fprintf (stderr, "0: bytes: %zu %*.*s\n", avail, (int) avail, (int) avail, buffer);
continue;
default: /* Seems to read something reasonable */
#if 0
fprintf (stdout, "got: %ld\n", wc);
#endif
pos += got;
used[wc / 32] |= (1 << (wc % 32));
if (got == avail) /* I just do not know how memcpy behaves in case of length equal to 0 :) */
avail = 0;
else
{
memcpy (buffer, buffer + got, avail - got);
avail -= got;
}
continue;
}
break;
}
/* Process stdin here */
/* mbrtowc */
#if 0
usage ();
test (0x12345678);
#endif
for (chars = 0, i = 0 ; i < BITS_NO ; ++i)
chars += bits (used[i]);
fprintf (stderr, "Used chars: %zu (%zu processed)\n", chars, pos);
#if 1
{
char *buf = (char *)malloc (1024);
int header, docopy;
for (header = 1, docopy = 0 ; fgets (buf, 1024, font) != NULL ;)
{
if (header)
{
if (strncmp (buf, "CHARS ", 6) == 0)
printf ("CHARS %zu\n", chars);
else if (strncmp (buf, "STARTCHAR ", 10) == 0)
header = 0;
else
fprintf (stdout, "%s", buf);
}
if (!header)
{
if (strncmp (buf, "STARTCHAR ", 10) == 0)
{
wc = strtol (buf + 12, NULL, 16);
docopy = used[wc / 32] & (1 << (wc % 32));
}
if (docopy)
fprintf (stdout, "%s", buf);
}
}
if (!header)
fputs ("ENDFONT\n", stdout);
free (buf);
}
#endif
fclose (font);
}
if (buffer != NULL)
free (buffer);
return error;
}
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