1 files changed, 95 insertions, 0 deletions
diff --git a/libbb/mtab.c b/libbb/mtab.c
new file mode 100644
index 0000000..28c9978
--- /dev/null
+++ b/libbb/mtab.c
@@ -0,0 +1,95 @@
+/* vi: set sw=4 ts=4: */
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <stdio.h>
+#include <mntent.h>
+#include "libbb.h"
+
+extern const char mtab_file[];	/* Defined in utility.c */
+static const int MS_RDONLY = 1;	/* Mount read-only.  */
+
+void erase_mtab(const char *name)
+{
+	struct mntent entries[20];
+	int count = 0;
+	FILE *mountTable = setmntent(mtab_file, "r");
+	struct mntent *m;
+
+	/* Check if reading the mtab file failed */
+	if (mountTable == 0
+			/* Bummer.  fall back on trying the /proc filesystem */
+			&& (mountTable = setmntent("/proc/mounts", "r")) == 0) {
+		perror_msg("%s", mtab_file);
+		return;
+	}
+
+	while ((m = getmntent(mountTable)) != 0) {
+		entries[count].mnt_fsname = strdup(m->mnt_fsname);
+		entries[count].mnt_dir = strdup(m->mnt_dir);
+		entries[count].mnt_type = strdup(m->mnt_type);
+		entries[count].mnt_opts = strdup(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_msg("%s", mtab_file);
+}
+
+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_msg("%s", 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 = find_mount_point(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);
+	}
+}