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