From bc3419069494fac078b316ce3a2f6a232c763c3e Mon Sep 17 00:00:00 2001
From: Eric Andersen
Date: Sat, 6 Nov 1999 04:56:00 +0000
Subject: Forgot this file...

---
 mtab.c | 148 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 148 insertions(+)
 create mode 100644 mtab.c

diff --git a/mtab.c b/mtab.c
new file mode 100644
index 0000000..b6304a1
--- /dev/null
+++ b/mtab.c
@@ -0,0 +1,148 @@
+#include "internal.h"
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <stdio.h>
+#include <mntent.h>
+#include <sys/mount.h>
+
+extern const char mtab_file[]; /* Defined in utility.c */
+
+static char *
+stralloc(const char * string)
+{
+	int	length = strlen(string) + 1;
+	char *	n = malloc(length);
+	memcpy(n, string, length);
+	return n;
+}
+
+extern void
+erase_mtab(const char * name)
+{
+	struct mntent	entries[20];
+	int	count = 0;
+	FILE *mountTable = setmntent(mtab_file, "r");
+	struct mntent *	m;
+
+	if ( mountTable == 0
+	 && (mountTable = setmntent("/proc/mounts", "r")) == 0 ) {
+		perror(mtab_file);
+		return;
+	}
+
+	while ( (m = getmntent(mountTable)) != 0 ) {
+		entries[count].mnt_fsname = stralloc(m->mnt_fsname);
+		entries[count].mnt_dir = stralloc(m->mnt_dir);
+		entries[count].mnt_type = stralloc(m->mnt_type);
+		entries[count].mnt_opts = stralloc(m->mnt_opts);
+		entries[count].mnt_freq = m->mnt_freq;
+		entries[count].mnt_passno = m->mnt_passno;
+		count++;
+	}
+	endmntent(mountTable);
+	if ( (mountTable = setmntent(mtab_file, "w")) ) {
+		int	i;
+		for ( i = 0; i < count; i++ ) {
+			int result = ( strcmp(entries[i].mnt_fsname, name) == 0
+			 || strcmp(entries[i].mnt_dir, name) == 0 );
+
+			if ( result )
+				continue;
+			else
+				addmntent(mountTable, &entries[i]);
+		}
+		endmntent(mountTable);
+	}
+	else if ( errno != EROFS )
+		perror(mtab_file);
+}
+
+/*
+ * Given a block device, find the mount table entry if that block device
+ * is mounted.
+ *
+ * Given any other file (or directory), find the mount table entry for its
+ * filesystem.
+ */
+static struct mntent *
+findMountPoint(const char * name, const char * table)
+{
+    struct stat	s;
+    dev_t mountDevice;
+    FILE* mountTable;
+    struct mntent* mountEntry;
+
+    if ( stat(name, &s) != 0 )
+	return 0;
+
+    if ( (s.st_mode & S_IFMT) == S_IFBLK )
+	mountDevice = s.st_rdev;
+    else
+	mountDevice = s.st_dev;
+
+    
+    if ( (mountTable = setmntent(table, "r")) == 0 )
+	return 0;
+
+    while ( (mountEntry = getmntent(mountTable)) != 0 ) {
+	if ( strcmp(name, mountEntry->mnt_dir) == 0 || 
+		strcmp(name, mountEntry->mnt_fsname) == 0 )	/* String match. */
+	    break;
+	if ( stat(mountEntry->mnt_fsname, &s) == 0 && 
+		s.st_rdev == mountDevice )	/* Match the device. */
+	    break;
+	if ( stat(mountEntry->mnt_dir, &s) == 0 && 
+		s.st_dev == mountDevice )	/* Match the directory's mount point. */
+	    break;
+    }
+    endmntent(mountTable);
+    return mountEntry;
+}
+
+extern void 
+write_mtab(char* blockDevice, char* directory, 
+	char* filesystemType, long flags, char* string_flags)
+{
+	FILE *mountTable = setmntent(mtab_file, "a+");
+	struct mntent m;
+
+	if ( mountTable == 0 ) {
+		perror(mtab_file);
+		return;
+	}
+	if (mountTable) {
+	    int	length = strlen(directory);
+
+	    if ( length > 1 && directory[length - 1] == '/' )
+		    directory[length - 1] = '\0';
+
+	    if ( filesystemType == 0 ) {
+		    struct mntent *	p
+		     = findMountPoint(blockDevice, "/proc/mounts");
+
+		    if ( p && p->mnt_type )
+			    filesystemType = p->mnt_type;
+	    }
+	    m.mnt_fsname = blockDevice;
+	    m.mnt_dir = directory;
+	    m.mnt_type = filesystemType ? filesystemType : "default";
+	    
+	    if (*string_flags) {
+		    m.mnt_opts = string_flags;
+	    } else {
+		    if ( (flags | MS_RDONLY) == flags )
+			    m.mnt_opts = "ro";
+		    else	
+			    m.mnt_opts = "rw";
+	    }
+	    
+	    m.mnt_freq = 0;
+	    m.mnt_passno = 0;
+	    addmntent(mountTable, &m);
+	    endmntent(mountTable);
+    }
+}
+
+
-- 
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