man/man-db-2.5.1-zio.dif

--- config.h.in
+++ config.h.in	2007-12-07 15:50:23.000000000 +0100
@@ -454,6 +454,9 @@
 /* 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	2008-04-21 13:18:38.854059561 +0200
@@ -94,7 +94,18 @@ 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],
+	 : ${zio=no})
 # Finish the argument parsing.
 AC_SUBST(man_owner)dnl
 AC_SUBST(man_mode)dnl
@@ -294,6 +305,29 @@ AC_SUBST(gunzip)
 AC_SUBST(uncompress)
 AC_SUBST(bunzip2)
 MAN_COMPRESS_LIB([z], [gzopen])
+dnl Check for zlib and libbz2 libraries to use this together
+dnl with SuSE's libzio to open compressed info files.
+dnl
+if test "$zio" = "no" || test -n "$zio"
+then
+   AC_CHECK_HEADER(zlib.h,[
+     for lib in z gz
+     do
+       AC_CHECK_LIB($lib, gzopen,     [LIBS="$LIBS -l$lib" ; LEXLIB="$LEXLIB -l$lib" ; break])
+     done])
+   AC_CHECK_HEADER(bzlib.h,[
+     for lib in bz2 bzip2
+     do
+       AC_CHECK_LIB($lib, BZ2_bzopen, [LIBS="$LIBS -l$lib" ; LEXLIB="$LEXLIB -l$lib" ; break])
+     done])
+   AC_CHECK_HEADER(zio.h,[
+     for lib in ${zio#lib} zio
+     do
+       AC_CHECK_LIB($lib, fzopen,     [LIBS="$LIBS -l$lib" ; LEXLIB="$LEXLIB -l$lib"
+		    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])])
+     done])
+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	2008-04-22 10:48:45.049189929 +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)
 {
 	command *cmd;
@@ -77,9 +107,49 @@ pipeline *decompress_open (const char *f
 	char *ext;
 	struct compression *comp;
 
-	if (stat (filename, &st) < 0 && !S_ISDIR (st.st_mode))
+	if (stat (filename, &st) < 0 || S_ISDIR (st.st_mode))
 		return NULL;
 
+#ifdef HAVE_ZIO
+	ext = strrchr(filename, '.');
+	if (ext && STREQ (ext, ".gz")) {
+		/* informational only; no shell quoting concerns */
+		char *name = appendstr (NULL, "zcat < ", filename, NULL);
+		cmd = command_new_function (name, &decompress_zio, "g");
+		free (name);
+		p = pipeline_new_commands (cmd, NULL);
+		p->libzio = 1;
+		goto got_pipeline;
+	}
+	if (ext && STREQ (ext, ".z")) {
+		/* informational only; no shell quoting concerns */
+		char *name = appendstr (NULL, "zcat < ", filename, NULL);
+		cmd = command_new_function (name, &decompress_zio, "z");
+		free (name);
+		p = pipeline_new_commands (cmd, NULL);
+		p->libzio = 1;
+		goto got_pipeline;
+	}
+	if (ext && STREQ (ext, ".bz2")) {
+		/* informational only; no shell quoting concerns */
+		char *name = appendstr (NULL, "bzcat < ", filename, NULL);
+		cmd = command_new_function (name, &decompress_zio, "b");
+		free (name);
+		p = pipeline_new_commands (cmd, NULL);
+		p->libzio = 1;
+		goto got_pipeline;
+	}
+	if (ext && STREQ (ext, ".Z")) {
+		/* informational only; no shell quoting concerns */
+		char *name = appendstr (NULL, "zcat < ", filename, NULL);
+		cmd = command_new_function (name, &decompress_zio, "Z");
+		free (name);
+		p = pipeline_new_commands (cmd, NULL);
+		p->libzio = 1;
+		goto got_pipeline;
+	}
+#endif /* HAVE_ZIO */
+
 #ifdef HAVE_LIBZ
 	filename_len = strlen (filename);
 	if (filename_len > 3 && STREQ (filename + filename_len - 3, ".gz")) {
--- lib/pipeline.c
+++ lib/pipeline.c	2008-04-22 13:38:04.181934493 +0000
@@ -50,6 +50,10 @@
 #include "error.h"
 #include "pipeline.h"
 
+#ifdef HAVE_ZIO
+#  include "zio.h"
+#endif /* HAVE_ZIO */
+
 /* ---------------------------------------------------------------------- */
 
 /* Functions to build individual commands. */
@@ -441,6 +445,9 @@ pipeline *pipeline_new (void)
 	p->commands = xnmalloc (p->commands_max, sizeof *p->commands);
 	p->pids = NULL;
 	p->statuses = NULL;
+#ifdef HAVE_ZIO
+	p->libzio = 0;
+#endif
 	p->want_in = p->want_out = 0;
 	p->want_infile = p->want_outfile = NULL;
 	p->infd = p->outfd = -1;
@@ -479,6 +486,9 @@ pipeline *pipeline_join (pipeline *p1, p
 	pipeline *p = XMALLOC (pipeline);
 	int i;
 
+#ifdef HAVE_ZIO
+	assert (p->libzio);
+#endif
 	assert (!p1->pids);
 	assert (!p2->pids);
 	assert (!p1->statuses);
@@ -614,6 +624,9 @@ void pipeline_commands (pipeline *p, ...
 
 FILE *pipeline_get_infile (pipeline *p)
 {
+#ifdef HAVE_ZIO
+	assert (!p->libzio);
+#endif
 	assert (p->pids);	/* pipeline started */
 	assert (p->statuses);
 	if (p->infile)
@@ -627,6 +640,12 @@ FILE *pipeline_get_infile (pipeline *p)
 
 FILE *pipeline_get_outfile (pipeline *p)
 {
+#ifdef HAVE_ZIO
+	if (p->libzio) {
+		assert (p->outfile != (FILE*)0);
+		return p->outfile;
+	}
+#endif
 	assert (p->pids);	/* pipeline started */
 	assert (p->statuses);
 	if (p->outfile)
@@ -707,6 +726,24 @@ void pipeline_start (pipeline *p)
 	int infd[2];
 	sigset_t set, oset;
 
+#ifdef HAVE_ZIO
+	if (p->ncommands != 1)	/* A pipe to the following commands required */
+		p->libzio = 0;
+
+	if (p->libzio) {
+		struct command_function *cmdf;
+
+		assert (p->ncommands == 1);
+		assert (p->commands[0]->tag == COMMAND_FUNCTION);
+		assert (p->want_infile != NULL);
+
+		cmdf = &p->commands[0]->u.function;
+
+		p->outfile = fzopen(p->want_infile, "r");
+
+		return;
+	}
+#endif
 	/* Flush all pending output so that subprocesses don't inherit it. */
 	fflush (NULL);
 
@@ -1009,6 +1046,18 @@ int pipeline_wait (pipeline *p)
 		pipeline_dump (p, stderr);
 	}
 
+#ifdef HAVE_ZIO
+	if (p->libzio) {
+		assert (p->outfile != (FILE*)0);
+		if (fclose (p->outfile)) {
+			error (0, errno, _("closing pipeline output stream failed"));
+			ret = 1;
+		}
+		p->outfile = (FILE*)0;
+		return ret;
+        } 
+#endif
+
 	assert (p->pids);	/* pipeline started */
 	assert (p->statuses);
 
@@ -1549,11 +1598,20 @@ static const char *get_block (pipeline *
 
 	if (!peek)
 		p->peek_offset = 0;
-
+#ifdef HAVE_ZIO
+	if (p->libzio) {
+		assert (p->outfile != (FILE*)0);
+		r = fread (p->buffer + readstart, sizeof(char), toread, p->outfile);
+		goto out;
+	}
+#endif
 	assert (p->outfd != -1);
 	r = read (p->outfd, p->buffer + readstart, toread);
 	if (r == -1)
 		return NULL;
+#ifdef HAVE_ZIO
+out:
+#endif
 	p->buflen = readstart + r;
 	if (peek)
 		p->peek_offset += r;
--- lib/pipeline.h
+++ lib/pipeline.h	2008-04-22 10:49:00.455159182 +0000
@@ -60,6 +60,14 @@ typedef struct pipeline {
 	pid_t *pids;
 	int *statuses;		/* -1 until command exits */
 
+#ifdef HAVE_ZIO
+	/*
+	 * Uses for e.g. simple decompression the help of libzio.
+	 * Do not fork in this case but open the compressed files.
+	 */
+	int libzio;
+#endif
+
 	/* To be set by the caller. If positive, these contain
 	 * caller-supplied file descriptors for the input and output of the
 	 * whole pipeline. If negative, pipeline_start() will create pipes