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@@ -5,6 +5,14 @@
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* Copyright (c) Ian F. Darwin, 1987.
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* Written by Ian F. Darwin.
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*
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+ * Extensively modified by Eric Fischer <enf@pobox.com> in July, 2000,
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+ * to handle character codes other than ASCII on a unified basis.
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+ *
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+ * Joerg Wunsch <joerg@freebsd.org> wrote the original support for 8-bit
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+ * international characters, now subsumed into this file.
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+ */
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+
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+/*
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* This software is not subject to any license of the American Telephone
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* and Telegraph Company or of the Regents of the University of California.
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*
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@@ -38,22 +46,50 @@
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#include "names.h"
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#ifndef lint
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-FILE_RCSID("@(#)$Id: ascmagic.c,v 1.24 1999/02/14 17:16:00 christos Exp $")
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+FILE_RCSID("@(#)$Id: ascmagic.c,v 1.30 2001/07/26 13:15:49 christos Exp $")
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#endif /* lint */
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- /* an optimisation over plain strcmp() */
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-#define STREQ(a, b) (*(a) == *(b) && strcmp((a), (b)) == 0)
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+typedef unsigned long unichar;
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+
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+#define MAXLINELEN 300 /* longest sane line length */
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+#define ISSPC(x) ((x) == ' ' || (x) == '\t' || (x) == '\r' || (x) == '\n' \
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+ || (x) == 0x85 || (x) == '\f')
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+
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+static int looks_ascii __P((const unsigned char *, int, unichar *, int *));
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+static int looks_utf8 __P((const unsigned char *, int, unichar *, int *));
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+static int looks_unicode __P((const unsigned char *, int, unichar *, int *));
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+static int looks_latin1 __P((const unsigned char *, int, unichar *, int *));
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+static int looks_extended __P((const unsigned char *, int, unichar *, int *));
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+static void from_ebcdic __P((const unsigned char *, int, unsigned char *));
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+static int ascmatch __P((const unsigned char *, const unichar *, int));
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int
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ascmagic(buf, nbytes)
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-unsigned char *buf;
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-int nbytes; /* size actually read */
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+ unsigned char *buf;
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+ int nbytes; /* size actually read */
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{
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- int i, has_escapes = 0;
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- unsigned char *s;
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- char nbuf[HOWMANY+1]; /* one extra for terminating '\0' */
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- char *token;
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- register struct names *p;
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+ int i;
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+ char nbuf[HOWMANY+1]; /* one extra for terminating '\0' */
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+ unichar ubuf[HOWMANY+1]; /* one extra for terminating '\0' */
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+ int ulen;
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+ struct names *p;
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+
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+ char *code = NULL;
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+ char *code_mime = NULL;
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+ char *type = NULL;
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+ char *subtype = NULL;
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+ char *subtype_mime = NULL;
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+
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+ int has_escapes = 0;
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+ int has_backspace = 0;
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+
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+ int n_crlf = 0;
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+ int n_lf = 0;
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+ int n_cr = 0;
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+ int n_nel = 0;
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+
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+ int last_line_end = -1;
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+ int has_long_lines = 0;
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/*
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* Do the tar test first, because if the first file in the tar
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@@ -61,66 +97,593 @@ int nbytes; /* size actually read */
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*/
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switch (is_tar(buf, nbytes)) {
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case 1:
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- ckfputs("tar archive", stdout);
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+ ckfputs(iflag ? "application/x-tar" : "tar archive", stdout);
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return 1;
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case 2:
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- ckfputs("POSIX tar archive", stdout);
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+ ckfputs(iflag ? "application/x-tar, POSIX"
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+ : "POSIX tar archive", stdout);
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return 1;
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}
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/*
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+ * Undo the NUL-termination kindly provided by process()
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+ * but leave at least one byte to look at
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+ */
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+
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+ while (nbytes > 1 && buf[nbytes - 1] == '\0')
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+ nbytes--;
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+
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+ /*
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+ * Then try to determine whether it's any character code we can
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+ * identify. Each of these tests, if it succeeds, will leave
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+ * the text converted into one-unichar-per-character Unicode in
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+ * ubuf, and the number of characters converted in ulen.
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+ */
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+ if (looks_ascii(buf, nbytes, ubuf, &ulen)) {
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+ code = "ASCII";
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+ code_mime = "us-ascii";
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+ type = "text";
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+ } else if (looks_utf8(buf, nbytes, ubuf, &ulen)) {
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+ code = "UTF-8 Unicode";
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+ code_mime = "utf-8";
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+ type = "text";
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+ } else if ((i = looks_unicode(buf, nbytes, ubuf, &ulen))) {
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+ if (i == 1)
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+ code = "Little-endian UTF-16 Unicode";
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+ else
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+ code = "Big-endian UTF-16 Unicode";
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+
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+ type = "character data";
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+ code_mime = "utf-16"; /* is this defined? */
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+ } else if (looks_latin1(buf, nbytes, ubuf, &ulen)) {
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+ code = "ISO-8859";
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+ type = "text";
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+ code_mime = "iso-8859-1";
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+ } else if (looks_extended(buf, nbytes, ubuf, &ulen)) {
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+ code = "Non-ISO extended-ASCII";
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+ type = "text";
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+ code_mime = "unknown";
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+ } else {
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+ from_ebcdic(buf, nbytes, nbuf);
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+
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+ if (looks_ascii(nbuf, nbytes, ubuf, &ulen)) {
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+ code = "EBCDIC";
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+ type = "character data";
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+ code_mime = "ebcdic";
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+ } else if (looks_latin1(nbuf, nbytes, ubuf, &ulen)) {
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+ code = "International EBCDIC";
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+ type = "character data";
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+ code_mime = "ebcdic";
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+ } else {
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+ return 0; /* doesn't look like text at all */
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+ }
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+ }
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+
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+ /*
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* for troff, look for . + letter + letter or .\";
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* this must be done to disambiguate tar archives' ./file
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* and other trash from real troff input.
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+ *
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+ * I believe Plan 9 troff allows non-ASCII characters in the names
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+ * of macros, so this test might possibly fail on such a file.
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*/
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- if (*buf == '.') {
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- unsigned char *tp = buf + 1;
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+ if (*ubuf == '.') {
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+ unichar *tp = ubuf + 1;
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- while (isascii(*tp) && isspace(*tp))
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+ while (ISSPC(*tp))
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++tp; /* skip leading whitespace */
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- if ((isascii(*tp) && (isalnum(*tp) || *tp=='\\') &&
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- isascii(tp[1]) && (isalnum(tp[1]) || tp[1] == '"'))) {
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- ckfputs("troff or preprocessor input text", stdout);
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- return 1;
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+ if ((tp[0] == '\\' && tp[1] == '\"') ||
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+ (isascii(tp[0]) && isalnum(tp[0]) &&
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+ isascii(tp[1]) && isalnum(tp[1]) &&
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+ ISSPC(tp[2]))) {
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+ subtype_mime = "text/troff";
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+ subtype = "troff or preprocessor input";
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+ goto subtype_identified;
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}
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}
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- if ((*buf == 'c' || *buf == 'C') &&
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- isascii(buf[1]) && isspace(buf[1])) {
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- ckfputs("fortran program text", stdout);
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+
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+ if ((*buf == 'c' || *buf == 'C') && ISSPC(buf[1])) {
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+ subtype_mime = "text/fortran";
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+ subtype = "fortran program";
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+ goto subtype_identified;
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+ }
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+
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+ /* look for tokens from names.h - this is expensive! */
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+
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+ i = 0;
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+ while (i < ulen) {
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+ int end;
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+
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+ /*
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+ * skip past any leading space
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+ */
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+ while (i < ulen && ISSPC(ubuf[i]))
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+ i++;
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+ if (i >= ulen)
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+ break;
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+
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+ /*
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+ * find the next whitespace
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+ */
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+ for (end = i + 1; end < nbytes; end++)
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+ if (ISSPC(ubuf[end]))
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+ break;
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+
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+ /*
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+ * compare the word thus isolated against the token list
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+ */
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+ for (p = names; p < names + NNAMES; p++) {
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+ if (ascmatch(p->name, ubuf + i, end - i)) {
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+ subtype = types[p->type].human;
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+ subtype_mime = types[p->type].mime;
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+ goto subtype_identified;
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+ }
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+ }
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+
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+ i = end;
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+ }
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+
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+subtype_identified:
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+
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+ /*
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+ * Now try to discover other details about the file.
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+ */
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+ for (i = 0; i < ulen; i++) {
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+ if (i > last_line_end + MAXLINELEN)
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+ has_long_lines = 1;
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+
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+ if (ubuf[i] == '\033')
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+ has_escapes = 1;
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+ if (ubuf[i] == '\b')
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+ has_backspace = 1;
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+
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+ if (ubuf[i] == '\r' && (i + 1 < ulen && ubuf[i + 1] == '\n')) {
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+ n_crlf++;
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+ last_line_end = i;
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+ }
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+ if (ubuf[i] == '\r' && (i + 1 >= ulen || ubuf[i + 1] != '\n')) {
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+ n_cr++;
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+ last_line_end = i;
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+ }
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+ if (ubuf[i] == '\n' && (i - 1 < 0 || ubuf[i - 1] != '\r')) {
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+ n_lf++;
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+ last_line_end = i;
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+ }
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+ if (ubuf[i] == 0x85) { /* X3.64/ECMA-43 "next line" character */
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+ n_nel++;
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+ last_line_end = i;
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+ }
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+ }
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+
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+ if (iflag) {
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+ if (subtype_mime)
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+ ckfputs(subtype_mime, stdout);
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+ else
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+ ckfputs("text/plain", stdout);
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+
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+ if (code_mime) {
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+ ckfputs("; charset=", stdout);
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+ ckfputs(code_mime, stdout);
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+ }
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+ } else {
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+ ckfputs(code, stdout);
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+
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+ if (subtype) {
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+ ckfputs(" ", stdout);
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+ ckfputs(subtype, stdout);
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+ }
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+
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+ ckfputs(" ", stdout);
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+ ckfputs(type, stdout);
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+
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+ if (has_long_lines)
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+ ckfputs(", with very long lines", stdout);
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+
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+ /*
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+ * Only report line terminators if we find one other than LF,
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+ * or if we find none at all.
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+ */
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+ if ((n_crlf == 0 && n_cr == 0 && n_nel == 0 && n_lf == 0) ||
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+ (n_crlf != 0 || n_cr != 0 || n_nel != 0)) {
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+ ckfputs(", with", stdout);
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+
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+ if (n_crlf == 0 && n_cr == 0 && n_nel == 0 && n_lf == 0)
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+ ckfputs(" no", stdout);
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+ else {
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+ if (n_crlf) {
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+ ckfputs(" CRLF", stdout);
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+ if (n_cr || n_lf || n_nel)
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+ ckfputs(",", stdout);
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+ }
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+ if (n_cr) {
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+ ckfputs(" CR", stdout);
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+ if (n_lf || n_nel)
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+ ckfputs(",", stdout);
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+ }
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+ if (n_lf) {
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+ ckfputs(" LF", stdout);
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+ if (n_nel)
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+ ckfputs(",", stdout);
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+ }
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+ if (n_nel)
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+ ckfputs(" NEL", stdout);
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+ }
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+
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+ ckfputs(" line terminators", stdout);
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+ }
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+
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+ if (has_escapes)
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+ ckfputs(", with escape sequences", stdout);
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+ if (has_backspace)
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+ ckfputs(", with overstriking", stdout);
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+ }
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+
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+ return 1;
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+}
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+
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+static int
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+ascmatch(s, us, ulen)
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+ const unsigned char *s;
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+ const unichar *us;
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+ int ulen;
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+{
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+ size_t i;
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+
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+ for (i = 0; i < ulen; i++) {
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+ if (s[i] != us[i])
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+ return 0;
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+ }
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+
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+ if (s[i])
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+ return 0;
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+ else
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return 1;
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+}
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+
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+/*
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+ * This table reflects a particular philosophy about what constitutes
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+ * "text," and there is room for disagreement about it.
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+ *
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+ * Version 3.31 of the file command considered a file to be ASCII if
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+ * each of its characters was approved by either the isascii() or
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+ * isalpha() function. On most systems, this would mean that any
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+ * file consisting only of characters in the range 0x00 ... 0x7F
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+ * would be called ASCII text, but many systems might reasonably
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+ * consider some characters outside this range to be alphabetic,
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+ * so the file command would call such characters ASCII. It might
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+ * have been more accurate to call this "considered textual on the
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+ * local system" than "ASCII."
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+ *
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+ * It considered a file to be "International language text" if each
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+ * of its characters was either an ASCII printing character (according
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+ * to the real ASCII standard, not the above test), a character in
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+ * the range 0x80 ... 0xFF, or one of the following control characters:
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+ * backspace, tab, line feed, vertical tab, form feed, carriage return,
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+ * escape. No attempt was made to determine the language in which files
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+ * of this type were written.
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+ *
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+ *
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+ * The table below considers a file to be ASCII if all of its characters
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+ * are either ASCII printing characters (again, according to the X3.4
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+ * standard, not isascii()) or any of the following controls: bell,
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+ * backspace, tab, line feed, form feed, carriage return, esc, nextline.
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+ *
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+ * I include bell because some programs (particularly shell scripts)
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+ * use it literally, even though it is rare in normal text. I exclude
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+ * vertical tab because it never seems to be used in real text. I also
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+ * include, with hesitation, the X3.64/ECMA-43 control nextline (0x85),
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+ * because that's what the dd EBCDIC->ASCII table maps the EBCDIC newline
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+ * character to. It might be more appropriate to include it in the 8859
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+ * set instead of the ASCII set, but it's got to be included in *something*
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+ * we recognize or EBCDIC files aren't going to be considered textual.
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+ * Some old Unix source files use SO/SI (^N/^O) to shift between Greek
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+ * and Latin characters, so these should possibly be allowed. But they
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+ * make a real mess on VT100-style displays if they're not paired properly,
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+ * so we are probably better off not calling them text.
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+ *
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+ * A file is considered to be ISO-8859 text if its characters are all
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+ * either ASCII, according to the above definition, or printing characters
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+ * from the ISO-8859 8-bit extension, characters 0xA0 ... 0xFF.
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+ *
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+ * Finally, a file is considered to be international text from some other
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+ * character code if its characters are all either ISO-8859 (according to
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+ * the above definition) or characters in the range 0x80 ... 0x9F, which
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+ * ISO-8859 considers to be control characters but the IBM PC and Macintosh
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+ * consider to be printing characters.
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+ */
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+
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+#define F 0 /* character never appears in text */
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+#define T 1 /* character appears in plain ASCII text */
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+#define I 2 /* character appears in ISO-8859 text */
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+#define X 3 /* character appears in non-ISO extended ASCII (Mac, IBM PC) */
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+
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+static char text_chars[256] = {
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+ /* BEL BS HT LF FF CR */
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|
|
+ F, F, F, F, F, F, F, T, T, T, T, F, T, T, F, F, /* 0x0X */
|
|
|
+ /* ESC */
|
|
|
+ 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 */
|
|
|
+ /* NEL */
|
|
|
+ X, X, X, X, X, T, X, X, X, X, X, X, X, X, X, X, /* 0x8X */
|
|
|
+ X, X, X, X, X, X, X, X, X, X, X, X, X, X, X, X, /* 0x9X */
|
|
|
+ I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, /* 0xaX */
|
|
|
+ I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, /* 0xbX */
|
|
|
+ I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, /* 0xcX */
|
|
|
+ I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, /* 0xdX */
|
|
|
+ I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, /* 0xeX */
|
|
|
+ I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, I /* 0xfX */
|
|
|
+};
|
|
|
+
|
|
|
+static int
|
|
|
+looks_ascii(buf, nbytes, ubuf, ulen)
|
|
|
+ const unsigned char *buf;
|
|
|
+ int nbytes;
|
|
|
+ unichar *ubuf;
|
|
|
+ int *ulen;
|
|
|
+{
|
|
|
+ int i;
|
|
|
+
|
|
|
+ *ulen = 0;
|
|
|
+
|
|
|
+ for (i = 0; i < nbytes; i++) {
|
|
|
+ int t = text_chars[buf[i]];
|
|
|
+
|
|
|
+ if (t != T)
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ ubuf[(*ulen)++] = buf[i];
|
|
|
}
|
|
|
|
|
|
+ return 1;
|
|
|
+}
|
|
|
+
|
|
|
+static int
|
|
|
+looks_latin1(buf, nbytes, ubuf, ulen)
|
|
|
+ const unsigned char *buf;
|
|
|
+ int nbytes;
|
|
|
+ unichar *ubuf;
|
|
|
+ int *ulen;
|
|
|
+{
|
|
|
+ int i;
|
|
|
+
|
|
|
+ *ulen = 0;
|
|
|
|
|
|
- /* Make sure we are dealing with ascii text before looking for tokens */
|
|
|
for (i = 0; i < nbytes; i++) {
|
|
|
- if (!isascii(buf[i]))
|
|
|
- return 0; /* not all ASCII */
|
|
|
+ int t = text_chars[buf[i]];
|
|
|
+
|
|
|
+ if (t != T && t != I)
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ ubuf[(*ulen)++] = buf[i];
|
|
|
}
|
|
|
|
|
|
- /* look for tokens from names.h - this is expensive! */
|
|
|
- /* make a copy of the buffer here because strtok() will destroy it */
|
|
|
- s = (unsigned char*) memcpy(nbuf, buf, nbytes);
|
|
|
- s[nbytes] = '\0';
|
|
|
- has_escapes = (memchr(s, '\033', nbytes) != NULL);
|
|
|
- while ((token = strtok((char *) s, " \t\n\r\f")) != NULL) {
|
|
|
- s = NULL; /* make strtok() keep on tokin' */
|
|
|
- for (p = names; p < names + NNAMES; p++) {
|
|
|
- if (STREQ(p->name, token)) {
|
|
|
- ckfputs(types[p->type], stdout);
|
|
|
- if (has_escapes)
|
|
|
- ckfputs(" (with escape sequences)",
|
|
|
- stdout);
|
|
|
- return 1;
|
|
|
+ return 1;
|
|
|
+}
|
|
|
+
|
|
|
+static int
|
|
|
+looks_extended(buf, nbytes, ubuf, ulen)
|
|
|
+ const unsigned char *buf;
|
|
|
+ int nbytes;
|
|
|
+ unichar *ubuf;
|
|
|
+ int *ulen;
|
|
|
+{
|
|
|
+ int i;
|
|
|
+
|
|
|
+ *ulen = 0;
|
|
|
+
|
|
|
+ for (i = 0; i < nbytes; i++) {
|
|
|
+ int t = text_chars[buf[i]];
|
|
|
+
|
|
|
+ if (t != T && t != I && t != X)
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ ubuf[(*ulen)++] = buf[i];
|
|
|
+ }
|
|
|
+
|
|
|
+ return 1;
|
|
|
+}
|
|
|
+
|
|
|
+int
|
|
|
+looks_utf8(buf, nbytes, ubuf, ulen)
|
|
|
+ const unsigned char *buf;
|
|
|
+ int nbytes;
|
|
|
+ unichar *ubuf;
|
|
|
+ int *ulen;
|
|
|
+{
|
|
|
+ int i, n;
|
|
|
+ unichar c;
|
|
|
+ int gotone = 0;
|
|
|
+
|
|
|
+ *ulen = 0;
|
|
|
+
|
|
|
+ for (i = 0; i < nbytes; i++) {
|
|
|
+ if ((buf[i] & 0x80) == 0) { /* 0xxxxxxx is plain ASCII */
|
|
|
+ /*
|
|
|
+ * Even if the whole file is valid UTF-8 sequences,
|
|
|
+ * still reject it if it uses weird control characters.
|
|
|
+ */
|
|
|
+
|
|
|
+ if (text_chars[buf[i]] != T)
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ ubuf[(*ulen)++] = buf[i];
|
|
|
+ } else if ((buf[i] & 0x40) == 0) { /* 10xxxxxx never 1st byte */
|
|
|
+ return 0;
|
|
|
+ } else { /* 11xxxxxx begins UTF-8 */
|
|
|
+ int following;
|
|
|
+
|
|
|
+ if ((buf[i] & 0x20) == 0) { /* 110xxxxx */
|
|
|
+ c = buf[i] & 0x1f;
|
|
|
+ following = 1;
|
|
|
+ } else if ((buf[i] & 0x10) == 0) { /* 1110xxxx */
|
|
|
+ c = buf[i] & 0x0f;
|
|
|
+ following = 2;
|
|
|
+ } else if ((buf[i] & 0x08) == 0) { /* 11110xxx */
|
|
|
+ c = buf[i] & 0x07;
|
|
|
+ following = 3;
|
|
|
+ } else if ((buf[i] & 0x04) == 0) { /* 111110xx */
|
|
|
+ c = buf[i] & 0x03;
|
|
|
+ following = 4;
|
|
|
+ } else if ((buf[i] & 0x02) == 0) { /* 1111110x */
|
|
|
+ c = buf[i] & 0x01;
|
|
|
+ following = 5;
|
|
|
+ } else
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ for (n = 0; n < following; n++) {
|
|
|
+ i++;
|
|
|
+ if (i >= nbytes)
|
|
|
+ goto done;
|
|
|
+
|
|
|
+ if ((buf[i] & 0x80) == 0 || (buf[i] & 0x40))
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ c = (c << 6) + (buf[i] & 0x3f);
|
|
|
}
|
|
|
+
|
|
|
+ ubuf[(*ulen)++] = c;
|
|
|
+ gotone = 1;
|
|
|
}
|
|
|
}
|
|
|
+done:
|
|
|
+ return gotone; /* don't claim it's UTF-8 if it's all 7-bit */
|
|
|
+}
|
|
|
+
|
|
|
+static int
|
|
|
+looks_unicode(buf, nbytes, ubuf, ulen)
|
|
|
+ const unsigned char *buf;
|
|
|
+ int nbytes;
|
|
|
+ unichar *ubuf;
|
|
|
+ int *ulen;
|
|
|
+{
|
|
|
+ int bigend;
|
|
|
+ int i;
|
|
|
|
|
|
- /* all else fails, but it is ASCII... */
|
|
|
- ckfputs("ASCII text", stdout);
|
|
|
- if (has_escapes) {
|
|
|
- ckfputs(" (with escape sequences)", stdout);
|
|
|
+ if (nbytes < 2)
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ if (buf[0] == 0xff && buf[1] == 0xfe)
|
|
|
+ bigend = 0;
|
|
|
+ else if (buf[0] == 0xfe && buf[1] == 0xff)
|
|
|
+ bigend = 1;
|
|
|
+ else
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ *ulen = 0;
|
|
|
+
|
|
|
+ for (i = 2; i + 1 < nbytes; i += 2) {
|
|
|
+ /* XXX fix to properly handle chars > 65536 */
|
|
|
+
|
|
|
+ if (bigend)
|
|
|
+ ubuf[(*ulen)++] = buf[i + 1] + 256 * buf[i];
|
|
|
+ else
|
|
|
+ ubuf[(*ulen)++] = buf[i] + 256 * buf[i + 1];
|
|
|
+
|
|
|
+ if (ubuf[*ulen - 1] == 0xfffe)
|
|
|
+ return 0;
|
|
|
+ if (ubuf[*ulen - 1] < 128 && text_chars[ubuf[*ulen - 1]] != T)
|
|
|
+ return 0;
|
|
|
}
|
|
|
+
|
|
|
return 1;
|
|
|
}
|
|
|
|
|
|
+#undef F
|
|
|
+#undef T
|
|
|
+#undef I
|
|
|
+#undef X
|
|
|
+
|
|
|
+/*
|
|
|
+ * This table maps each EBCDIC character to an (8-bit extended) ASCII
|
|
|
+ * character, as specified in the rationale for the dd(1) command in
|
|
|
+ * draft 11.2 (September, 1991) of the POSIX P1003.2 standard.
|
|
|
+ *
|
|
|
+ * Unfortunately it does not seem to correspond exactly to any of the
|
|
|
+ * five variants of EBCDIC documented in IBM's _Enterprise Systems
|
|
|
+ * Architecture/390: Principles of Operation_, SA22-7201-06, Seventh
|
|
|
+ * Edition, July, 1999, pp. I-1 - I-4.
|
|
|
+ *
|
|
|
+ * Fortunately, though, all versions of EBCDIC, including this one, agree
|
|
|
+ * on most of the printing characters that also appear in (7-bit) ASCII.
|
|
|
+ * Of these, only '|', '!', '~', '^', '[', and ']' are in question at all.
|
|
|
+ *
|
|
|
+ * Fortunately too, there is general agreement that codes 0x00 through
|
|
|
+ * 0x3F represent control characters, 0x41 a nonbreaking space, and the
|
|
|
+ * remainder printing characters.
|
|
|
+ *
|
|
|
+ * This is sufficient to allow us to identify EBCDIC text and to distinguish
|
|
|
+ * between old-style and internationalized examples of text.
|
|
|
+ */
|
|
|
+
|
|
|
+unsigned char ebcdic_to_ascii[] = {
|
|
|
+ 0, 1, 2, 3, 156, 9, 134, 127, 151, 141, 142, 11, 12, 13, 14, 15,
|
|
|
+ 16, 17, 18, 19, 157, 133, 8, 135, 24, 25, 146, 143, 28, 29, 30, 31,
|
|
|
+128, 129, 130, 131, 132, 10, 23, 27, 136, 137, 138, 139, 140, 5, 6, 7,
|
|
|
+144, 145, 22, 147, 148, 149, 150, 4, 152, 153, 154, 155, 20, 21, 158, 26,
|
|
|
+' ', 160, 161, 162, 163, 164, 165, 166, 167, 168, 213, '.', '<', '(', '+', '|',
|
|
|
+'&', 169, 170, 171, 172, 173, 174, 175, 176, 177, '!', '$', '*', ')', ';', '~',
|
|
|
+'-', '/', 178, 179, 180, 181, 182, 183, 184, 185, 203, ',', '%', '_', '>', '?',
|
|
|
+186, 187, 188, 189, 190, 191, 192, 193, 194, '`', ':', '#', '@', '\'','=', '"',
|
|
|
+195, 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 196, 197, 198, 199, 200, 201,
|
|
|
+202, 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', '^', 204, 205, 206, 207, 208,
|
|
|
+209, 229, 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 210, 211, 212, '[', 214, 215,
|
|
|
+216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228, ']', 230, 231,
|
|
|
+'{', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 232, 233, 234, 235, 236, 237,
|
|
|
+'}', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 238, 239, 240, 241, 242, 243,
|
|
|
+'\\',159, 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 244, 245, 246, 247, 248, 249,
|
|
|
+'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 250, 251, 252, 253, 254, 255
|
|
|
+};
|
|
|
|
|
|
+/*
|
|
|
+ * The following EBCDIC-to-ASCII table may relate more closely to reality,
|
|
|
+ * or at least to modern reality. It comes from
|
|
|
+ *
|
|
|
+ * http://ftp.s390.ibm.com/products/oe/bpxqp9.html
|
|
|
+ *
|
|
|
+ * and maps the characters of EBCDIC code page 1047 (the code used for
|
|
|
+ * Unix-derived software on IBM's 390 systems) to the corresponding
|
|
|
+ * characters from ISO 8859-1.
|
|
|
+ *
|
|
|
+ * If this table is used instead of the above one, some of the special
|
|
|
+ * cases for the NEL character can be taken out of the code.
|
|
|
+ */
|
|
|
+
|
|
|
+unsigned char ebcdic_1047_to_8859[] = {
|
|
|
+0x00,0x01,0x02,0x03,0x9C,0x09,0x86,0x7F,0x97,0x8D,0x8E,0x0B,0x0C,0x0D,0x0E,0x0F,
|
|
|
+0x10,0x11,0x12,0x13,0x9D,0x0A,0x08,0x87,0x18,0x19,0x92,0x8F,0x1C,0x1D,0x1E,0x1F,
|
|
|
+0x80,0x81,0x82,0x83,0x84,0x85,0x17,0x1B,0x88,0x89,0x8A,0x8B,0x8C,0x05,0x06,0x07,
|
|
|
+0x90,0x91,0x16,0x93,0x94,0x95,0x96,0x04,0x98,0x99,0x9A,0x9B,0x14,0x15,0x9E,0x1A,
|
|
|
+0x20,0xA0,0xE2,0xE4,0xE0,0xE1,0xE3,0xE5,0xE7,0xF1,0xA2,0x2E,0x3C,0x28,0x2B,0x7C,
|
|
|
+0x26,0xE9,0xEA,0xEB,0xE8,0xED,0xEE,0xEF,0xEC,0xDF,0x21,0x24,0x2A,0x29,0x3B,0x5E,
|
|
|
+0x2D,0x2F,0xC2,0xC4,0xC0,0xC1,0xC3,0xC5,0xC7,0xD1,0xA6,0x2C,0x25,0x5F,0x3E,0x3F,
|
|
|
+0xF8,0xC9,0xCA,0xCB,0xC8,0xCD,0xCE,0xCF,0xCC,0x60,0x3A,0x23,0x40,0x27,0x3D,0x22,
|
|
|
+0xD8,0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0xAB,0xBB,0xF0,0xFD,0xFE,0xB1,
|
|
|
+0xB0,0x6A,0x6B,0x6C,0x6D,0x6E,0x6F,0x70,0x71,0x72,0xAA,0xBA,0xE6,0xB8,0xC6,0xA4,
|
|
|
+0xB5,0x7E,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7A,0xA1,0xBF,0xD0,0x5B,0xDE,0xAE,
|
|
|
+0xAC,0xA3,0xA5,0xB7,0xA9,0xA7,0xB6,0xBC,0xBD,0xBE,0xDD,0xA8,0xAF,0x5D,0xB4,0xD7,
|
|
|
+0x7B,0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0xAD,0xF4,0xF6,0xF2,0xF3,0xF5,
|
|
|
+0x7D,0x4A,0x4B,0x4C,0x4D,0x4E,0x4F,0x50,0x51,0x52,0xB9,0xFB,0xFC,0xF9,0xFA,0xFF,
|
|
|
+0x5C,0xF7,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5A,0xB2,0xD4,0xD6,0xD2,0xD3,0xD5,
|
|
|
+0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0xB3,0xDB,0xDC,0xD9,0xDA,0x9F
|
|
|
+};
|
|
|
+
|
|
|
+/*
|
|
|
+ * Copy buf[0 ... nbytes-1] into out[], translating EBCDIC to ASCII.
|
|
|
+ */
|
|
|
+static void
|
|
|
+from_ebcdic(buf, nbytes, out)
|
|
|
+ const unsigned char *buf;
|
|
|
+ int nbytes;
|
|
|
+ unsigned char *out;
|
|
|
+{
|
|
|
+ int i;
|
|
|
+
|
|
|
+ for (i = 0; i < nbytes; i++) {
|
|
|
+ out[i] = ebcdic_to_ascii[buf[i]];
|
|
|
+ }
|
|
|
+}
|