merge with 1.9.4f

[gnulib.git] / lib / fsusage.c

diff --git a/lib/fsusage.c b/lib/fsusage.c
index 8f3f3cd..d0d7465 100644 (file)
--- a/lib/fsusage.c
+++ b/lib/fsusage.c
@@ -68,26 +68,27 @@ int statfs ();
 int statvfs ();
 #endif
 
-/* Set B_NEW to the number of TOSIZE-byte blocks used by B FROMSIZE-byte
-   blocks, rounding away from zero.  TOSIZE must be positive.  Return -1
-   from invoking function if FROMSIZE is not positive.  */
-
-#define ADJUST_BLOCKS(b_new, b, fromsize, tosize)                      \
-  do                                                                   \
-    {                                                                  \
-      if ((tosize) <= 0)                                               \
-       abort ();                                                       \
-      if ((fromsize) <= 0)                                             \
-       return -1;                                                      \
-                                                                       \
-      if ((fromsize) == (tosize))      /* E.g., from 512 to 512.  */   \
-       (b_new) = (b);                                                  \
-      else if ((fromsize) > (tosize))  /* E.g., from 2048 to 512.  */  \
-       (b_new) = (b) * ((fromsize) / (tosize));                        \
-      else                             /* E.g., from 256 to 512.  */   \
-       (b_new) = ((b) + ((b) < 0 ? -1 : 1)) / ((tosize) / (fromsize)); \
-    }                                                                  \
-  while (0)
+/* Return the number of TOSIZE-byte blocks used by
+   BLOCKS FROMSIZE-byte blocks, rounding away from zero.
+   TOSIZE must be positive.  Return -1 if FROMSIZE is not positive.  */
+
+static long
+adjust_blocks (blocks, fromsize, tosize)
+     long blocks;
+     int fromsize, tosize;
+{
+  if (tosize <= 0)
+    abort ();
+  if (fromsize <= 0)
+    return -1;
+                                                                   
+  if (fromsize == tosize)      /* E.g., from 512 to 512.  */
+    return blocks;
+  else if (fromsize > tosize)  /* E.g., from 2048 to 512.  */
+    return blocks * (fromsize / tosize);
+  else                         /* E.g., from 256 to 512.  */
+    return (blocks + (blocks < 0 ? -1 : 1)) / (tosize / fromsize);
+}
 
 /* Fill in the fields of FSP with information about space usage for
    the filesystem on which PATH resides.
@@ -104,8 +105,8 @@ get_fs_usage (path, disk, fsp)
   struct statfs fsd;
 
   if (statfs (path, &fsd, sizeof (struct statfs)) != 0)
-    return (-1);
-#define CONVERT_BLOCKS(bnew, b) ADJUST_BLOCKS ((bnew), (b), fsd.f_fsize, 512)
+    return -1;
+#define CONVERT_BLOCKS(b) adjust_blocks ((b), fsd.f_fsize, 512)
 #endif /* STAT_STATFS3_OSF1 */
 
 #ifdef STAT_STATFS2_FS_DATA    /* Ultrix.  */
@@ -113,10 +114,10 @@ get_fs_usage (path, disk, fsp)
 
   if (statfs (path, &fsd) != 1)
     return -1;
-#define CONVERT_BLOCKS(bnew, b) ADJUST_BLOCKS ((bnew), (b), 1024, 512)
-  CONVERT_BLOCKS (fsp->fsu_blocks, fsd.fd_req.btot);
-  CONVERT_BLOCKS (fsp->fsu_bfree, fsd.fd_req.bfree);
-  CONVERT_BLOCKS (fsp->fsu_bavail, fsd.fd_req.bfreen);
+#define CONVERT_BLOCKS(b) adjust_blocks ((b), 1024, 512)
+  fsp->fsu_blocks = CONVERT_BLOCKS (fsd.fd_req.btot);
+  fsp->fsu_bfree = CONVERT_BLOCKS (fsd.fd_req.bfree);
+  fsp->fsu_bavail = CONVERT_BLOCKS (fsd.fd_req.bfreen);
   fsp->fsu_files = fsd.fd_req.gtot;
   fsp->fsu_ffree = fsd.fd_req.gfree;
 #endif
@@ -138,11 +139,10 @@ get_fs_usage (path, disk, fsp)
       return -1;
     }
   close (fd);
-#define CONVERT_BLOCKS(bnew, b) \
-    ADJUST_BLOCKS ((bnew), (b), (fsd.s_type == Fs2b ? 1024 : 512), 512)
-  CONVERT_BLOCKS (fsp->fsu_blocks, fsd.s_fsize);
-  CONVERT_BLOCKS (fsp->fsu_bfree, fsd.s_tfree);
-  CONVERT_BLOCKS (fsp->fsu_bavail, fsd.s_tfree);
+#define CONVERT_BLOCKS(b) adjust_blocks ((b), (fsd.s_type == Fs2b ? 1024 : 512), 512)
+  fsp->fsu_blocks = CONVERT_BLOCKS (fsd.s_fsize);
+  fsp->fsu_bfree = CONVERT_BLOCKS (fsd.s_tfree);
+  fsp->fsu_bavail = CONVERT_BLOCKS (fsd.s_tfree);
   fsp->fsu_files = (fsd.s_isize - 2) * INOPB * (fsd.s_type == Fs2b ? 2 : 1);
   fsp->fsu_ffree = fsd.s_tinode;
 #endif
@@ -152,7 +152,7 @@ get_fs_usage (path, disk, fsp)
 
   if (statfs (path, &fsd) < 0)
     return -1;
-#define CONVERT_BLOCKS(bnew, b) ADJUST_BLOCKS ((bnew), (b), fsd.f_bsize, 512)
+#define CONVERT_BLOCKS(b) adjust_blocks ((b), fsd.f_bsize, 512)
 #endif
 
 #ifdef STAT_STATFS2_FSIZE      /* 4.4BSD.  */
@@ -160,7 +160,7 @@ get_fs_usage (path, disk, fsp)
 
   if (statfs (path, &fsd) < 0)
     return -1;
-#define CONVERT_BLOCKS(bnew, b) ADJUST_BLOCKS ((bnew), (b), fsd.f_fsize, 512)
+#define CONVERT_BLOCKS(b) adjust_blocks ((b), fsd.f_fsize, 512)
 #endif
 
 #ifdef STAT_STATFS4            /* SVR3, Dynix, Irix.  */
@@ -171,13 +171,7 @@ get_fs_usage (path, disk, fsp)
   /* Empirically, the block counts on most SVR3 and SVR3-derived
      systems seem to always be in terms of 512-byte blocks,
      no matter what value f_bsize has.  */
-#define CONVERT_BLOCKS(bnew, b)                                                \
-  do                                                                   \
-    {                                                                  \
-      (bnew) = (b);                                                    \
-    }                                                                  \
-  while (0)
-
+#define CONVERT_BLOCKS(b) (b)
 #ifndef _SEQUENT_              /* _SEQUENT_ is DYNIX/ptx.  */
 #ifndef DOLPHIN                        /* DOLPHIN 3.8.alfa/7.18 has f_bavail */
 #define f_bavail f_bfree
@@ -191,14 +185,14 @@ get_fs_usage (path, disk, fsp)
   if (statvfs (path, &fsd) < 0)
     return -1;
   /* f_frsize isn't guaranteed to be supported.  */
-#define CONVERT_BLOCKS(bnew, b) \
-  ADJUST_BLOCKS ((bnew), (b), fsd.f_frsize ? fsd.f_frsize : fsd.f_bsize, 512)
+#define CONVERT_BLOCKS(b) \
+  adjust_blocks ((b), fsd.f_frsize ? fsd.f_frsize : fsd.f_bsize, 512)
 #endif
 
 #if !defined(STAT_STATFS2_FS_DATA) && !defined(STAT_READ) /* !Ultrix && !SVR2.  */
-  CONVERT_BLOCKS (fsp->fsu_blocks, fsd.f_blocks);
-  CONVERT_BLOCKS (fsp->fsu_bfree, fsd.f_bfree);
-  CONVERT_BLOCKS (fsp->fsu_bavail, fsd.f_bavail);
+  fsp->fsu_blocks = CONVERT_BLOCKS (fsd.f_blocks);
+  fsp->fsu_bfree = CONVERT_BLOCKS (fsd.f_bfree);
+  fsp->fsu_bavail = CONVERT_BLOCKS (fsd.f_bavail);
   fsp->fsu_files = fsd.f_files;
   fsp->fsu_ffree = fsd.f_ffree;
 #endif