Add fstab(3).

libc/Makefile

@@ -352,6 +352,12 @@ fcntl/openat.o \
 fcntl/open.o \
 fsmarshall/fsm_fsbind.o \
 fsmarshall/fsm_mountat.o \
+fstab/endfsent.o \
+fstab/getfsent.o \
+fstab/getfsfile.o \
+fstab/getfsspec.o \
+fstab/scanfsent.o \
+fstab/setfsent.o \
 getopt/getopt_long.o \
 getopt/getopt.o \
 grp/endgrent.o \

libc/fstab/endfsent.cpp

@@ -0,0 +1,34 @@
+/*******************************************************************************
+
+    Copyright(C) Jonas 'Sortie' Termansen 2015.
+
+    This file is part of the Sortix C Library.
+
+    The Sortix C Library is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or (at your
+    option) any later version.
+
+    The Sortix C Library 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 Lesser General Public
+    License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
+
+    fstab/endfsent.cpp
+    Closes the filesystem table.
+
+*******************************************************************************/
+
+#include <fstab.h>
+#include <stdio.h>
+
+extern "C" void endfsent(void)
+{
+	if ( !__fstab_file )
+		return;
+	fclose(__fstab_file);
+	__fstab_file = NULL;
+}

libc/fstab/getfsent.cpp

@@ -0,0 +1,48 @@
+/*******************************************************************************
+
+    Copyright(C) Jonas 'Sortie' Termansen 2015.
+
+    This file is part of the Sortix C Library.
+
+    The Sortix C Library is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or (at your
+    option) any later version.
+
+    The Sortix C Library 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 Lesser General Public
+    License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
+
+    fstab/getfsent.cpp
+    Read filesystem table entry.
+
+*******************************************************************************/
+
+#include <fstab.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+extern "C" struct fstab* getfsent(void)
+{
+	if ( !__fstab_file && !setfsent() )
+		return NULL;
+	static struct fstab fs;
+	static char* line = NULL;
+	static size_t line_size = 0;
+	ssize_t line_length;
+	while ( 0 <= (line_length = getline(&line, &line_size, __fstab_file)) )
+	{
+		if ( line_length && line[line_length - 1] == '\n' )
+			line[--line_length] = '\0';
+		if ( scanfsent(line, &fs) )
+			return &fs;
+	}
+	free(line);
+	line = NULL;
+	line_size = 0;
+	return NULL;
+}

libc/fstab/getfsfile.cpp

@@ -0,0 +1,37 @@
+/*******************************************************************************
+
+    Copyright(C) Jonas 'Sortie' Termansen 2015.
+
+    This file is part of the Sortix C Library.
+
+    The Sortix C Library is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or (at your
+    option) any later version.
+
+    The Sortix C Library 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 Lesser General Public
+    License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
+
+    fstab/getfsfile.cpp
+    Lookup filesystem table by mount point.
+
+*******************************************************************************/
+
+#include <fstab.h>
+#include <string.h>
+
+extern "C" struct fstab* getfsfile(const char* mount_point)
+{
+	if ( !setfsent() )
+		return NULL;
+	struct fstab* fs;
+	while ( (fs = getfsent()) )
+		if ( !strcmp(fs->fs_file, mount_point) )
+			return fs;
+	return NULL;
+}

libc/fstab/getfsspec.cpp

@@ -0,0 +1,37 @@
+/*******************************************************************************
+
+    Copyright(C) Jonas 'Sortie' Termansen 2015.
+
+    This file is part of the Sortix C Library.
+
+    The Sortix C Library is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or (at your
+    option) any later version.
+
+    The Sortix C Library 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 Lesser General Public
+    License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
+
+    fstab/getfsspec.cpp
+    Lookup filesystem table by special file.
+
+*******************************************************************************/
+
+#include <fstab.h>
+#include <string.h>
+
+extern "C" struct fstab* getfsspec(const char* special_file)
+{
+	if ( !setfsent() )
+		return NULL;
+	struct fstab* fs;
+	while ( (fs = getfsent()) )
+		if ( !strcmp(fs->fs_spec, special_file) )
+			return fs;
+	return NULL;
+}

libc/fstab/scanfsent.cpp

@@ -0,0 +1,101 @@
+/*******************************************************************************
+
+    Copyright(C) Jonas 'Sortie' Termansen 2015.
+
+    This file is part of the Sortix C Library.
+
+    The Sortix C Library is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or (at your
+    option) any later version.
+
+    The Sortix C Library 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 Lesser General Public
+    License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
+
+    fstab/scanfsent.cpp
+    Parse filesystem table entry.
+
+*******************************************************************************/
+
+#include <ctype.h>
+#include <fstab.h>
+#include <stdlib.h>
+#include <string.h>
+
+static char* next_fsent_field(char** str_p)
+{
+	char* str = *str_p;
+	while ( *str && isspace((unsigned char) *str) )
+		str++;
+	if ( !*str || *str == '#' )
+		return NULL;
+	size_t length = 1;
+	while ( str[length] &&
+	        !isspace((unsigned char) str[length]) &&
+	        str[length] != '#' )
+		length++;
+	if ( str[length] )
+	{
+		char c = str[length];
+		str[length] = '\0';
+		*str_p = str + length + (c != '#' ? 1 : 0);
+	}
+	else
+		*str_p = str + length;
+	return str;
+}
+
+char* find_fstype(char* str)
+{
+	const char* types[] =
+	{
+		FSTAB_RO,
+		FSTAB_RQ,
+		FSTAB_RW,
+		FSTAB_SW,
+		FSTAB_XX,
+	};
+	size_t count = sizeof(types) / sizeof(types[0]);
+	while ( *str )
+	{
+		while ( *str == ',' )
+		{
+			str++;
+			continue;
+		}
+		size_t length = strcspn(str, ",");
+		if ( length == 2 )
+		{
+			for ( size_t i = 0; i < count; i++ )
+				if ( str[0] == types[i][0] && str[1] == types[i][1] )
+					return (char*) types[i];
+		}
+		str += length;
+	}
+	return NULL;
+}
+
+extern "C" int scanfsent(char* str, struct fstab* fs)
+{
+	char* str_freq;
+	char* str_passno;
+	if ( !(fs->fs_spec = next_fsent_field(&str)) ||
+	     !(fs->fs_file = next_fsent_field(&str)) ||
+	     !(fs->fs_vfstype = next_fsent_field(&str)) ||
+	     !(fs->fs_mntops = next_fsent_field(&str)) ||
+	     !(str_freq = next_fsent_field(&str)) ||
+	     !(str_passno = next_fsent_field(&str)) )
+		return 0;
+	if ( !(fs->fs_type = find_fstype(fs->fs_mntops)) )
+		return 0;
+	if ( !strcmp(fs->fs_type, "xx") )
+		return 0;
+	fs->fs_freq = atoi(str_freq);
+	fs->fs_passno = atoi(str_passno);
+	return 1;
+}

libc/fstab/setfsent.cpp

@@ -0,0 +1,37 @@
+/*******************************************************************************
+
+    Copyright(C) Jonas 'Sortie' Termansen 2015.
+
+    This file is part of the Sortix C Library.
+
+    The Sortix C Library is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or (at your
+    option) any later version.
+
+    The Sortix C Library 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 Lesser General Public
+    License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
+
+    fstab/setfsent.cpp
+    Open filesystem table.
+
+*******************************************************************************/
+
+#include <fstab.h>
+#include <stdio.h>
+
+extern "C" { FILE* __fstab_file = NULL; }
+
+extern "C" int setfsent(void)
+{
+	if ( __fstab_file )
+		rewind(__fstab_file);
+	else if ( !(__fstab_file = fopen("/etc/fstab", "r")) )
+		return 0;
+	return 1;
+}

libc/include/fstab.h

@@ -0,0 +1,71 @@
+/*******************************************************************************
+
+    Copyright(C) Jonas 'Sortie' Termansen 2015.
+
+    This file is part of the Sortix C Library.
+
+    The Sortix C Library is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or (at your
+    option) any later version.
+
+    The Sortix C Library 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 Lesser General Public
+    License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
+
+    fstab.h
+    Filesystem table.
+
+*******************************************************************************/
+
+#ifndef INCLUDE_FSTAB_H
+#define INCLUDE_FSTAB_H
+
+#include <sys/cdefs.h>
+
+#ifndef __FILE_defined
+#define __FILE_defined
+typedef struct __FILE FILE;
+#endif
+
+struct fstab
+{
+	char* fs_spec;
+	char* fs_file;
+	char* fs_vfstype;
+	char* fs_mntops;
+	char* fs_type;
+	int fs_freq;
+	int fs_passno;
+};
+
+#define	FSTAB_RO "ro"
+#define	FSTAB_RQ "rq"
+#define	FSTAB_RW "rw"
+#define	FSTAB_SW "sw"
+#define	FSTAB_XX "xx"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if defined(__is_sortix_libc)
+extern FILE* __fstab_file;
+#endif
+
+void endfsent(void);
+struct fstab* getfsent(void);
+struct fstab* getfsfile(const char*);
+struct fstab* getfsspec(const char*);
+int scanfsent(char*, struct fstab*);
+int setfsent(void);
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif