man/man-db-2.7.1-zio.dif

---
 config.h.in      |    3 ++
 configure.ac     |   52 ++++++++++++++++++++++++++++++++++++++++++++
 lib/decompress.c |   65 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 120 insertions(+)

--- config.h.in
+++ config.h.in	2018-11-23 13:11:12.684900437 +0000
@@ -896,6 +896,9 @@
 /* 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 <limits.h> header file. */
 #undef HAVE_LIMITS_H
 
--- configure.ac
+++ configure.ac	2018-11-23 13:09:58.982262008 +0000
@@ -34,6 +34,18 @@ MAN_ARG_DEVICE
 MAN_ARG_DB
 MAN_ARG_CONFIG_FILE
 MAN_ARG_SECTIONS
+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],
+	[: ${zio=no}])
 MAN_ARG_AUTOMATIC_CREATE
 MAN_ARG_AUTOMATIC_UPDATE
 MAN_ARG_CATS
@@ -325,6 +337,46 @@ AC_SUBST([unlzma])
 AC_SUBST([unxz])
 AC_SUBST([unlzip])
 MAN_COMPRESS_LIB([z], [gzopen])
+dnl Check for zlib and libbz2 libraries to use this together
+dnl with SUSE's libzio to open compressed info files.
+dnl
+if test "$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(lzmadec.h, [
+	for lib in lzma lzmadec
+	do
+	  AC_CHECK_LIB($lib, lzmadec_open,       [LIBS="$LIBS -Wl,--no-as-needed -l$lib"; break])
+	done
+      ])
+      AC_CHECK_HEADER(lzma.h, [
+	for lib in lzma
+	do
+	  AC_CHECK_LIB($lib, lzma_easy_encoder,  [LIBS="$LIBS -Wl,--no-as-needed -l$lib"; break])
+	done
+      ])
+    fi
+fi
 dnl To add more decompressors just follow the scheme above.
 
 # Check for various header files and associated libraries.
--- lib/decompress.c
+++ lib/decompress.c	2018-11-23 13:12:59.714923151 +0000
@@ -38,6 +38,10 @@
 
 #include "xvasprintf.h"
 
+#ifdef HAVE_ZIO
+#  include "zio.h"
+#endif /* HAVE_ZIO */
+
 #include "manconfig.h"
 #include "comp_src.h"
 #include "pipeline.h"
@@ -69,6 +73,32 @@ 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 */
+
 extern man_sandbox *sandbox;
 
 pipeline *decompress_open (const char *filename)
@@ -85,6 +115,37 @@ 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) {
+		const char *opt;
+		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")) {
@@ -96,7 +157,11 @@ pipeline *decompress_open (const char *f
 	}
 #endif /* HAVE_LIBZ */
 
+#ifdef HAVE_ZIO
+nozio:
+#else
 	ext = strrchr (filename, '.');
+#endif /* HAVE_LIBZ */
 	if (ext) {
 		++ext;