Added several constant macros as args to bufsize.

lib/libstatfsext.h

@@ -23,7 +23,7 @@
 #ifndef _LIBSTATFSEXT_H
 #define _LIBSTATFSEXT_H
 
-#define LIBVERSION 2.0.0
+#define LIBVERSION 2.0.1
 
 #include <stdio.h>
 #include <sys/statfs.h>      /* for statfs struct */
@@ -41,6 +41,7 @@
 #define FS_TYPE_LEN      90
 #define MNT_FLAGS_LEN    256
 
+
 struct mounted_fs_entry {
     char fs_spec[PATH_MAX];           /* device or special file system path */
     char fs_file[PATH_MAX];           /* mount point */
@@ -50,6 +51,7 @@ struct mounted_fs_entry {
     int  fs_passno;                   /* pass */
 };
 
+
 #if __WORDSIZE == 32
 #define __WORD_TYPE int
 #else /* __WORDSIZE == 64 */
@@ -75,13 +77,49 @@ struct statfs_ext {
     char f_mntfromname[PATH_MAX];    /* mounted file sytem */
 };
 
-#define FS_1 sizeof(struct statfs_ext)
-#define FS_ALL 0
+
+/* These constants are for passing to the `bufsize` argument of
+ * getfsstat_ext(). Passing FS_NUM will tell the function to just
+ * return the number of mounted filesystems. FS_1 through FS_20 will
+ * populate statfs_ext structs for the first 1-20 mounted filesystems.
+ * FS_ALL will populate structs for all mounted filesystems.
+ * 
+ * Note that getfsstat_ext's return value will be the number of mounted
+ * filesystems it has found regardless of how many structs were asked for.
+ */ 
+
+#define STATFS_EXT_SIZE sizeof(struct statfs_ext)
+#define FS_NUM 0
+#define FS_1 STATFS_EXT_SIZE
+#define FS_2 (FS_1 * 2)
+#define FS_3 (FS_1 * 3)
+#define FS_4 (FS_1 * 4)
+#define FS_5 (FS_1 * 5)
+#define FS_6 (FS_1 * 6)
+#define FS_7 (FS_1 * 7)
+#define FS_8 (FS_1 * 8)
+#define FS_9 (FS_1 * 9)
+#define FS_10 (FS_1 * 10)
+#define FS_11 (FS_1 * 11)
+#define FS_12 (FS_1 * 12)
+#define FS_13 (FS_1 * 13)
+#define FS_14 (FS_1 * 14)
+#define FS_15 (FS_1 * 15)
+#define FS_16 (FS_1 * 16)
+#define FS_17 (FS_1 * 17)
+#define FS_18 (FS_1 * 18)
+#define FS_19 (FS_1 * 19)
+#define FS_20 (FS_1 * 20)
+// bufsize expects a long int, so this must be 
+// an arbitrary 'magic number'.
+#define FS_ALL 0xdeadbee 
+
 
 /* function prototypes */
 extern int getmntpt(const char *path, char *mount_point);
 extern int statfs_ext(const char *path, struct statfs_ext *struct_buf);
 extern int getfsstat_ext(struct statfs_ext **struct_array_buf, long int bufsize, int flags);
 
+
 #endif /* _LIBSTATFSEXT_H */