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/* $OpenBSD: internat.c,v 1.2 2002/02/17 19:42:30 millert Exp $ */
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include "file.h"
#define F 0
#define T 1
/*
* List of characters that look "reasonable" in international
* language texts. That's almost all characters :), except a
* few in the control range of ASCII (all the known international
* charactersets share the bottom half with ASCII).
*/
static char maybe_internat[256] = {
F, F, F, F, F, F, F, F, T, T, T, T, T, T, F, F, /* 0x0X */
F, F, F, F, F, F, F, F, F, F, F, T, F, F, F, F, /* 0x1X */
T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, /* 0x2X */
T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, /* 0x3X */
T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, /* 0x4X */
T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, /* 0x5X */
T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, /* 0x6X */
T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, F, /* 0x7X */
T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, /* 0x8X */
T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, /* 0x9X */
T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, /* 0xaX */
T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, /* 0xbX */
T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, /* 0xcX */
T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, /* 0xdX */
T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, /* 0xeX */
T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T /* 0xfX */
};
/* Maximal length of a line we consider "reasonable". */
#define MAXLINELEN 300
int
internatmagic(buf, nbytes)
unsigned char *buf;
int nbytes;
{
int i;
unsigned char *cp;
nbytes--;
/* First, look whether there are "unreasonable" characters. */
for (i = 0, cp = buf; i < nbytes; i++, cp++)
if (!maybe_internat[*cp])
return 0;
/*
* Now, look whether the file consists of lines of
* "reasonable" length.
*/
for (i = 0; i < nbytes;) {
cp = memchr(buf, '\n', nbytes - i);
if (cp == NULL) {
/* Don't fail if we hit the end of buffer. */
if (i + MAXLINELEN >= nbytes)
break;
else
return 0;
}
if (cp - buf > MAXLINELEN)
return 0;
i += (cp - buf + 1);
buf = cp + 1;
}
ckfputs("International language text", stdout);
return 1;
}
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