man/man-db-2.6.3-zio.dif

--- config.h.in
+++ config.h.in	2012-10-02 09:06:48.591006953 +0000
@@ -674,6 +674,9 @@
 /* Define to 1 if you have the `z' library (-lz). */
 #undef HAVE_LIBZ
 
+/* Define to 1 if you have libzio for opening compressed manuals */
+#undef HAVE_ZIO
+
 /* Define to 1 if you have the <linewrap.h> header file. */
 #undef HAVE_LINEWRAP_H
 
--- configure.ac
+++ configure.ac	2012-10-02 09:55:06.783914808 +0000
@@ -98,6 +98,18 @@ AC_ARG_WITH([sections],
 		sections="$withval"
 	 fi],
 	[: ${sections=1 n l 8 3 2 5 4 9 6 7}])
+AC_ARG_WITH([zio],
+[AS_HELP_STRING([--with-zio=LIBRARY], [use zlib/libbz2 wrapper library LIBRARY (libzio)])],
+	[if test -z "$withval" -o "$withval" = "yes"
+	 then
+		zio=libzio
+	 elif test "$withval" = "no"
+	 then
+		AC_MSG_ERROR(--with-zio requires an argument)
+	 else
+		zio=$withval
+	 fi],
+	[: ${zio=no}])
 AC_ARG_ENABLE([automatic-create],
 [AS_HELP_STRING([--enable-automatic-create], [allow man to create user databases on the fly])],
 	[if test "$enableval" = "yes"
@@ -375,6 +387,40 @@ AC_SUBST([unlzma])
 AC_SUBST([unxz])
 AC_SUBST([unlzip])
 MAN_COMPRESS_LIB([z], [gzopen])
+dnl Check for zlib and libbz2 libraries to use this together
+dnl with SuSE's libzio to open compressed info files.
+dnl
+if test "$zio" = "no" || test -n "$zio"
+then
+   AC_CHECK_HEADER(zio.h,[
+     for lib in ${zio#lib} zio
+     do
+       AC_CHECK_LIB($lib, fzopen,	    [LIBS="-l$lib $LIBS"; am_cv_libzio=yes])
+     done
+   ])
+   if test "$am_cv_libzio" = yes; then
+     AC_DEFINE([COMP_SRC],[],[Define if you have compressors and want to support compressed cat files.])
+     AC_DEFINE([HAVE_ZIO],[],[Define to 1 if you have libzio for opening compressed manuals])
+     AC_CHECK_HEADER(zlib.h,[
+       for lib in z gz
+       do
+	 AC_CHECK_LIB($lib, gzopen,	    [LIBS="$LIBS -Wl,--no-as-needed -l$lib"; break])
+       done
+     ])
+     AC_CHECK_HEADER(bzlib.h,[
+       for lib in bz2 bzip2
+       do
+	 AC_CHECK_LIB($lib, BZ2_bzopen,	    [LIBS="$LIBS -Wl,--no-as-needed -l$lib"; break])
+       done
+     ])
+     AC_CHECK_HEADER(lzma.h, [
+       for lib in lzma lzmadec
+       do
+	 AC_CHECK_LIB($lib, lzmadec_open,   [LIBS="$LIBS -Wl,--no-as-needed -l$lib"; break])
+       done
+     ])
+   fi
+fi
 dnl To add more decompressors just follow the scheme above.
 
 # Work out which manual page hierarchy scheme might be in use.
--- lib/decompress.c
+++ lib/decompress.c	2012-10-02 09:05:43.787007258 +0000
@@ -36,6 +36,10 @@
 #  include "zlib.h"
 #endif /* HAVE_LIBZ */
 
+#ifdef HAVE_ZIO
+#  include "zio.h"
+#endif /* HAVE_ZIO */
+
 #include "manconfig.h"
 #include "comp_src.h"
 #include "pipeline.h"
@@ -66,6 +70,32 @@ static void decompress_zlib (void *data
 
 #endif /* HAVE_LIBZ */
 
+#ifdef HAVE_ZIO
+
+static void decompress_zio (void *data)
+{
+	const char *what = (const char*)data;
+	FILE *file;
+
+	file = fdzopen(dup (fileno (stdin)), "r", what);
+	if (!file)
+		return;
+
+	for (;;) {
+		char buffer[4096];
+		int r = fread(buffer, sizeof(char), sizeof(buffer), file);
+		if (r <= 0)
+			break;
+		if (fwrite (buffer, 1, (size_t) r, stdout) < (size_t) r)
+			break;
+	}
+
+        fclose(file);
+	return;
+}
+
+#endif /* HAVE_ZIO */
+
 pipeline *decompress_open (const char *filename)
 {
 	pipecmd *cmd;
@@ -80,6 +110,37 @@ pipeline *decompress_open (const char *f
 	if (stat (filename, &st) < 0 || S_ISDIR (st.st_mode))
 		return NULL;
 
+#ifdef HAVE_ZIO
+	ext = strrchr (filename, '.');
+	if (ext) {
+		char opt[2] = {'\0', '\0'};
+		char *name;
+
+		if (STREQ (ext, ".gz"))
+			*opt = 'g';
+		else if (STREQ (ext, ".z"))
+			*opt = 'z';
+		else if (STREQ (ext, ".bz2"))
+			*opt = 'b';
+		else if (STREQ (ext, ".xz"))
+			*opt = 'x';
+		else if (STREQ (ext, ".lzma"))
+			*opt = 'l';
+		else if (STREQ (ext, ".Z"))
+			*opt = 'Z';
+		else
+			goto nozio;
+
+		/* informational only; no shell quoting concerns */
+		name = appendstr (NULL, "libzio < ", filename, NULL);
+		cmd = pipecmd_new_function (name, &decompress_zio, NULL,
+					    opt);
+		free (name);
+		p = pipeline_new_commands (cmd, NULL);
+		goto got_pipeline;
+	}
+#endif /* HAVE_ZIO */
+
 #ifdef HAVE_LIBZ
 	filename_len = strlen (filename);
 	if (filename_len > 3 && STREQ (filename + filename_len - 3, ".gz")) {
@@ -93,7 +154,11 @@ pipeline *decompress_open (const char *f
 	}
 #endif /* HAVE_LIBZ */
 
+#ifdef HAVE_ZIO
+nozio:
+#else
 	ext = strrchr (filename, '.');
+#endif /* HAVE_LIBZ */
 	if (ext) {
 		++ext;