Forgot this file...

1 files changed, 148 insertions, 0 deletions

diff --git a/mtab.c b/mtab.c
new file mode 100644
index 000000000..b6304a174
--- /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);
+    }
+}
+
+