Adding upstream version 2.11.2.upstream/2.11.2upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 570 insertions, 0 deletions

diff --git a/src/manconv.c b/src/manconv.c
new file mode 100644
index 0000000..e775b1b
--- /dev/null
+++ b/src/manconv.c
@@ -0,0 +1,570 @@
+/*
+ * manconv.c: convert manual page from one encoding to another
+ *
+ * Copyright (C) 2007, 2008, 2009, 2010, 2012 Colin Watson.
+ * Based loosely on parts of glibc's iconv_prog.c, which is:
+ * Copyright (C) 1998-2004, 2005, 2006, 2007 Free Software Foundation, Inc.
+ *
+ * This file is part of man-db.
+ *
+ * man-db is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * man-db is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with man-db; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* This program arose during a discussion with Adam Borowski. See:
+ *   https://lists.debian.org/debian-mentors/2007/09/msg00245.html
+ * It behaves like iconv, but allows multiple source encodings and
+ * attempts to guess the first one that works. An Emacs-style
+ * "-*- coding:" declaration overrides this.
+ */
+
+#ifdef HAVE_CONFIG_H
+#  include "config.h"
+#endif /* HAVE_CONFIG_H */
+
+#include <assert.h>
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <unistd.h>
+
+#ifdef HAVE_ICONV
+#  include <iconv.h>
+#endif /* HAVE_ICONV */
+
+#include "argp.h"
+#include "attribute.h"
+#include "error.h"
+#include "gl_list.h"
+#include "xalloc.h"
+#include "xstrndup.h"
+#include "xvasprintf.h"
+
+#include "gettext.h"
+#include <locale.h>
+#define _(String) gettext (String)
+
+#include "manconfig.h"
+
+#include "debug.h"
+#include "fatal.h"
+#include "glcontainers.h"
+
+#include "decompress.h"
+#include "manconv.h"
+
+/* Encoding conversions from groff-1.20/src/preproc/preconv/preconv.cpp.
+ * I've only included those not already recognised by GNU libiconv.
+ */
+struct conversion_entry {
+	const char *from;
+	const char *to;
+};
+
+static struct conversion_entry conversion_table[] = {
+	{ "chinese-big5",			"Big5" },
+	{ "chinese-euc",			"GB2312" },
+	{ "chinese-iso-8bit",			"GB2312" },
+	{ "cn-gb-2312",				"GB2312" },
+	{ "cp878",				"KOI8-R" },
+	{ "cyrillic-iso-8bit",			"ISO-8859-5" },
+	{ "cyrillic-koi8",			"KOI8-R" },
+	{ "euc-china",				"GB2312" },
+	{ "euc-japan",				"EUC-JP" },
+	{ "euc-japan-1990",			"EUC-JP" },
+	{ "euc-kr",				"EUC-KR" },
+	{ "greek-iso-8bit",			"ISO-8859-7" },
+	{ "iso-latin-1",			"ISO-8859-1" },
+	{ "iso-latin-2",			"ISO-8859-2" },
+	{ "iso-latin-5",			"ISO-8859-9" },
+	{ "iso-latin-7",			"ISO-8859-13" },
+	{ "iso-latin-9",			"ISO-8859-15" },
+	{ "japanese-iso-8bit",			"EUC-JP" },
+	{ "japanese-euc",			"EUC-JP" },
+	{ "jis8",				"EUC-JP" },
+	{ "korean-euc",				"EUC-KR" },
+	{ "korean-iso-8bit",			"EUC-KR" },
+	{ "latin-0",				"ISO-8859-15" },
+	{ "latin-1",				"ISO-8859-1" },
+	{ "latin-2",				"ISO-8859-2" },
+	{ "latin-5",				"ISO-8859-9" },
+	{ "latin-7",				"ISO-8859-13" },
+	{ "mule-utf-16",			"UTF-16" },
+	{ "mule-utf-16be",			"UTF-16BE" },
+	{ "mule-utf-16-be",			"UTF-16BE" },
+	{ "mule-utf-16be-with-signature",	"UTF-16" },
+	{ "mule-utf-16le",			"UTF-16LE" },
+	{ "mule-utf-16-le",			"UTF-16LE" },
+	{ "mule-utf-16le-with-signature",	"UTF-16" },
+	{ "mule-utf-8",				"UTF-8" },
+	{ "utf-16-be",				"UTF-16BE" },
+	{ "utf-16be-with-signature",		"UTF-16" },
+	{ "utf-16-be-with-signature",		"UTF-16" },
+	{ "utf-16-le",				"UTF-16LE" },
+	{ "utf-16le-with-signature",		"UTF-16" },
+	{ "utf-16-le-with-signature",		"UTF-16" },
+	{ NULL,					NULL }
+};
+
+/* Convert Emacs-style coding tags to ones that libiconv understands. */
+static char *convert_encoding (char *encoding)
+{
+	size_t encoding_len = strlen (encoding);
+	const struct conversion_entry *entry;
+
+#define STRIP(s, l) do { \
+	if (encoding_len > (l) && \
+	    !strcasecmp (encoding + encoding_len - (l), (s))) \
+		encoding[encoding_len - (l)] = '\0'; \
+} while (0)
+
+	STRIP ("-dos", 4);
+	STRIP ("-mac", 4);
+	STRIP ("-unix", 5);
+
+#undef STRIP
+
+	for (entry = conversion_table; entry->from; ++entry)
+		if (!strcasecmp (entry->from, encoding)) {
+			free (encoding);
+			return xstrdup (entry->to);
+		}
+
+	return encoding;
+}
+
+/* Inspect the first line of data from a decompressor for preprocessor
+ * encoding declarations.
+ *
+ * If to_encoding and modified_line are both non-NULL, and if the encoding
+ * declaration in the input does not match to_encoding, then return an
+ * encoding declaration line modified to refer to the given to_encoding in
+ * *modified_line.  The caller should free *modified_line.
+ */
+char *check_preprocessor_encoding (decompress *decomp, const char *to_encoding,
+				   char **modified_line)
+{
+	char *pp_encoding = NULL;
+	const char *line = decompress_peekline (decomp);
+	const char *directive = NULL, *directive_end = NULL, *pp_search = NULL;
+	size_t pp_encoding_len = 0;
+
+	/* Some people use .\" incorrectly. We allow it for encoding
+	 * declarations but not for preprocessor declarations.
+	 */
+	if (line &&
+	    (STRNEQ (line, PP_COOKIE, 4) || STRNEQ (line, ".\\\" ", 4))) {
+		const char *newline = strchr (line, '\n');
+
+		directive = line + 4;
+		directive_end = newline ? newline : strchr (directive, '\0');
+		pp_search = memmem (directive, directive_end - directive,
+				    "-*-", 3);
+	}
+
+	if (directive && pp_search) {
+		pp_search += 3;
+		while (pp_search && pp_search < directive_end && *pp_search) {
+			while (*pp_search == ' ')
+				++pp_search;
+			if (STRNEQ (pp_search, "coding:", 7)) {
+				const char *pp_encoding_allow;
+				pp_search += 7;
+				while (*pp_search == ' ')
+					++pp_search;
+				pp_encoding_allow = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+						    "abcdefghijklmnopqrstuvwxyz"
+						    "0123456789-_/:.()";
+				pp_encoding_len = strspn (pp_search,
+							  pp_encoding_allow);
+				pp_encoding = xstrndup (pp_search,
+							pp_encoding_len);
+				pp_encoding = convert_encoding (pp_encoding);
+				debug ("preprocessor encoding: %s\n",
+				       pp_encoding);
+				break;
+			} else {
+				pp_search = memchr (pp_search, ';',
+						    directive_end - pp_search);
+				if (pp_search)
+					++pp_search;
+			}
+		}
+	}
+
+	if (to_encoding && modified_line &&
+	    pp_encoding && strcasecmp (pp_encoding, to_encoding)) {
+		assert (directive_end);
+		assert (pp_search);
+		*modified_line = xasprintf
+			("%.*s%s%.*s\n",
+			 (int) (pp_search - line), line,
+			 to_encoding,
+			 (int) (directive_end - (pp_search + pp_encoding_len)),
+			 pp_search + pp_encoding_len);
+	}
+
+	return pp_encoding;
+}
+
+static int add_output (const char *inbuf, size_t inlen,
+		       struct manconv_outbuf *outbuf)
+{
+	int ret = 0;
+
+	if (outbuf) {
+		if (outbuf->len + inlen >= outbuf->max)
+			fatal (0, "out of space in output buffer");
+		memcpy (outbuf->buf + outbuf->len, inbuf, inlen);
+		outbuf->len += inlen;
+	} else {
+		int errno_save = errno;
+		if (fwrite (inbuf, 1, inlen, stdout) < inlen ||
+		    ferror (stdout)) {
+			error (0, 0, _("can't write to standard output"));
+			ret = -1;
+		}
+		errno = errno_save;
+	}
+
+	return ret;
+}
+
+#ifdef HAVE_ICONV
+
+/* When converting text containing an invalid multibyte sequence to
+ * UTF-8//IGNORE, GNU libc's iconv returns EILSEQ but sets *inbuf to the end
+ * of the input buffer.  I'm not sure whether this is a bug or not (it seems
+ * to contradict the documentation), but work around it anyway by recoding
+ * to UTF-8 so that we can accurately position the error.
+ */
+static off_t locate_error (const char *try_from_code,
+			   const char *input, size_t input_size,
+			   char *utf8, size_t utf8_size)
+{
+	iconv_t cd_utf8_strict;
+	char *inptr = (char *) input, *utf8ptr = utf8;
+	size_t inleft = input_size, utf8left = utf8_size;
+	size_t n;
+	off_t ret;
+
+	cd_utf8_strict = iconv_open ("UTF-8", try_from_code);
+	if (cd_utf8_strict == (iconv_t) -1) {
+		error (0, errno, "iconv_open (\"UTF-8\", \"%s\")",
+		       try_from_code);
+		return 0;
+	}
+
+	n = iconv (cd_utf8_strict, (ICONV_CONST char **) &inptr, &inleft,
+		   &utf8ptr, &utf8left);
+	if (n == (size_t) -1)
+		ret = inptr - input;
+	else
+		ret = 0;
+
+	iconv_close (cd_utf8_strict);
+
+	return ret;
+}
+
+typedef enum {
+	TRIED_ICONV_OK = 0,
+	TRIED_ICONV_ERROR = -1,  /* can continue with another encoding */
+	TRIED_ICONV_FATAL = -2   /* must give up */
+} tried_iconv;
+
+static tried_iconv try_iconv (decompress *decomp, const char *try_from_code,
+			      const char *to, bool last,
+			      struct manconv_outbuf *outbuf)
+{
+	char *try_to_code = xstrdup (to);
+	static const size_t buf_size = 65536;
+	size_t input_size = buf_size;
+	off_t input_pos = 0;
+	const char *input;
+	static char *utf8 = NULL, *output = NULL;
+	size_t utf8left = 0;
+	iconv_t cd_utf8, cd = NULL;
+	bool to_utf8 = STREQ (try_to_code, "UTF-8") ||
+		       STRNEQ (try_to_code, "UTF-8//", 7);
+	const char *utf8_target = last ? "UTF-8//IGNORE" : "UTF-8";
+	bool ignore_errors = (strstr (try_to_code, "//IGNORE") != NULL);
+	tried_iconv ret = TRIED_ICONV_OK;
+
+	debug ("trying encoding %s -> %s\n", try_from_code, try_to_code);
+
+	cd_utf8 = iconv_open (utf8_target, try_from_code);
+	if (cd_utf8 == (iconv_t) -1) {
+		error (0, errno, "iconv_open (\"%s\", \"%s\")",
+		       utf8_target, try_from_code);
+		free (try_to_code);
+		return TRIED_ICONV_ERROR;
+	}
+
+	if (!to_utf8) {
+		cd = iconv_open (try_to_code, "UTF-8");
+		if (cd == (iconv_t) -1) {
+			error (0, errno, "iconv_open (\"%s\", \"UTF-8\")",
+			       try_to_code);
+			free (try_to_code);
+			return TRIED_ICONV_ERROR;
+		}
+	}
+
+	input = decompress_peek (decomp, &input_size);
+	if (input_size < buf_size) {
+		/* End of file, error, or just a short read? Repeat until we
+		 * have either a full buffer or EOF/error.
+		 */
+		while (input_size < buf_size) {
+			size_t old_input_size = input_size;
+			input_size = buf_size;
+			input = decompress_peek (decomp, &input_size);
+			if (input_size == old_input_size)
+				break;
+		}
+	}
+
+	if (!utf8)
+		utf8 = xmalloc (buf_size);
+	if (!output)
+		output = xmalloc (buf_size);
+
+	while (input_size || utf8left) {
+		int handle_iconv_errors = 0;
+		char *inptr = (char *) input, *utf8ptr = utf8, *outptr;
+		size_t inleft = input_size, outleft;
+		size_t n, n2 = -1;
+
+		if (!utf8left) {
+			/* First, convert the text to UTF-8. By assumption,
+			 * all validly-encoded text can be converted to
+			 * UTF-8 assuming that we picked the correct
+			 * encoding. Any errors at this stage are due to
+			 * selecting an incorrect encoding, or due to
+			 * misencoded source text.
+			 */
+			utf8left = buf_size;
+			n = iconv (cd_utf8, (ICONV_CONST char **) &inptr,
+				   &inleft, &utf8ptr, &utf8left);
+			utf8left = buf_size - utf8left;
+
+			/* If we need to try the next encoding, do that
+			 * before writing anything.
+			 */
+			if (!last && n == (size_t) -1 &&
+			    (errno == EILSEQ ||
+			     (errno == EINVAL && input_size < buf_size))) {
+				ret = TRIED_ICONV_ERROR;
+				break;
+			} else if (n == (size_t) -1)
+				handle_iconv_errors = errno;
+		}
+
+		/* If the target encoding is UTF-8 (the common case), then
+		 * we can just write out what we've got. Otherwise, we need
+		 * to convert to the target encoding. Any errors at this
+		 * stage are due to characters that are not representable in
+		 * the target encoding.
+		 */
+		if (handle_iconv_errors)
+			/* Fall back to error handling below.  If we have
+			 * anything to write out, we'll do it next time
+			 * round the loop.
+			 */
+			outptr = output;
+		else if (to_utf8) {
+			memcpy (output, utf8, utf8left);
+			outptr = output + utf8left;
+			outleft = utf8left;
+			utf8left = 0;
+		} else if (utf8left) {
+			outptr = output;
+			outleft = buf_size;
+			utf8ptr = utf8;
+			n2 = iconv (
+				cd, (ICONV_CONST char **) &utf8ptr, &utf8left,
+				&outptr, &outleft);
+			outleft = buf_size - outleft;
+			if (n2 == (size_t) -1)
+				handle_iconv_errors = errno;
+
+			if (n2 == (size_t) -1 &&
+			    errno == EILSEQ && ignore_errors)
+				errno = 0;
+		} else
+			/* We appear to have converted some input text, but
+			 * not actually ended up with any UTF-8 text.  This
+			 * is odd.  However, we can at least continue round
+			 * the loop, skip the input text we converted, and
+			 * then we should get a different result next time.
+			 */
+			outptr = output;
+
+		if (outptr != output) {
+			/* We have something to write out. */
+			if (add_output (output, outleft, outbuf) != 0) {
+				ret = TRIED_ICONV_FATAL;
+				goto out;
+			}
+		}
+
+		if (!to_utf8 && n2 != (size_t) -1) {
+			/* All the UTF-8 text we have so far was processed.
+			 * For state-dependent character sets we have to
+			 * flush the state now.
+			 */
+			outptr = output;
+			outleft = buf_size;
+			iconv (cd, NULL, NULL, &outptr, &outleft);
+			outleft = buf_size - outleft;
+
+			if (outptr != output) {
+				/* We have something to write out. */
+				if (add_output (output, outleft,
+						outbuf) != 0) {
+					ret = TRIED_ICONV_FATAL;
+					goto out;
+				}
+			}
+		} else if (handle_iconv_errors) {
+			intmax_t error_pos;
+
+			if (handle_iconv_errors == EILSEQ && !ignore_errors) {
+				if (!quiet) {
+					error_pos = input_pos + locate_error (
+						try_from_code,
+						input, input_size,
+						utf8, buf_size);
+					error (0, handle_iconv_errors,
+					       "byte %jd: iconv", error_pos);
+				}
+				ret = TRIED_ICONV_FATAL;
+				goto out;
+			} else if (handle_iconv_errors == EINVAL &&
+				   input_size < buf_size) {
+				if (!quiet) {
+					error_pos = input_pos + locate_error (
+						try_from_code,
+						input, input_size,
+						utf8, buf_size);
+					error (0, 0, "byte %jd: %s", error_pos,
+					       _("iconv: incomplete character "
+						 "at end of buffer"));
+				}
+				ret = TRIED_ICONV_FATAL;
+				goto out;
+			}
+		}
+
+		if (inptr != input) {
+			decompress_peek_skip (decomp, input_size - inleft);
+			input_pos += input_size - inleft;
+		}
+
+		/* Unless we have some UTF-8 text left (which will only
+		 * happen if the output encoding is more verbose than UTF-8,
+		 * so is unlikely for legacy encodings), we need to fetch
+		 * more input text now.
+		 */
+		if (!utf8left) {
+			input_size = buf_size;
+			input = decompress_peek (decomp, &input_size);
+			while (input_size < buf_size) {
+				size_t old_input_size = input_size;
+				input_size = buf_size;
+				input = decompress_peek (decomp, &input_size);
+				if (input_size == old_input_size)
+					break;
+			}
+		}
+	}
+
+out:
+	if (!to_utf8)
+		iconv_close (cd);
+	iconv_close (cd_utf8);
+	free (try_to_code);
+
+	return ret;
+}
+
+int manconv (decompress *decomp, gl_list_t from, const char *to,
+	     struct manconv_outbuf *outbuf)
+{
+	char *pp_encoding;
+	const char *try_from_code;
+	char *plain_to, *modified_pp_line = NULL;
+	tried_iconv tried;
+	int ret = 0;
+
+	plain_to = xstrndup (to, strcspn (to, "/"));
+	pp_encoding = check_preprocessor_encoding
+		(decomp, plain_to, &modified_pp_line);
+	if (pp_encoding) {
+		if (modified_pp_line) {
+			size_t len = strlen (modified_pp_line);
+			decompress_readline (decomp);
+			if (add_output (modified_pp_line, len, outbuf) != 0) {
+				ret = -1;
+				goto out;
+			}
+		}
+		tried = try_iconv (decomp, pp_encoding, to, 1, outbuf);
+		if (tried == TRIED_ICONV_FATAL)
+			ret = -1;
+	} else {
+		GL_LIST_FOREACH (from, try_from_code) {
+			bool last = !gl_list_next_node (from, from_node);
+			tried = try_iconv (decomp, try_from_code, to, last,
+					   outbuf);
+			if (tried == TRIED_ICONV_OK)
+				break;
+			else if (tried == TRIED_ICONV_FATAL) {
+				ret = -1;
+				goto out;
+			}
+		}
+	}
+
+out:
+	free (modified_pp_line);
+	free (pp_encoding);
+	free (plain_to);
+	return ret;
+}
+
+#else /* !HAVE_ICONV */
+
+/* If we don't have iconv, there isn't much we can do; just pass everything
+ * through unchanged.
+ */
+int manconv (decompress *decomp, gl_list_t from MAYBE_UNUSED,
+	     const char *to MAYBE_UNUSED, struct manconv_outbuf *outbuf)
+{
+	for (;;) {
+		size_t len = 4096;
+		const char *buffer = decompress_read (decomp, &len);
+		if (len == 0)
+			break;
+		if (add_output (buffer, len, outbuf) != 0)
+			return -1;
+	}
+	return 0;
+}
+
+#endif /* HAVE_ICONV */