[svn-r7616] Purpose:

    Code cleanup

Description:
    Change field member count and indices for compound and enumerated types from
'int' to 'unsigned' to better reflect actual use.

    Cleaned up a few other minor compiler warnings, etc.

Platforms tested:
    FreeBSD 4.9 (sleipnir)
    Linux 2.4 (verbena)
    too minor to require h5committest

14 files changed, 310 insertions, 246 deletions

diff --git a/src/H5Odtype.c b/src/H5Odtype.c
index 5ab3fb4..e399870 100644
--- a/src/H5Odtype.c
+++ b/src/H5Odtype.c
@@ -93,7 +93,7 @@ static herr_t
 H5O_dtype_decode_helper(H5F_t *f, const uint8_t **pp, H5T_t *dt)
 {
     unsigned		flags, version;
-    int		i, j;
+    unsigned		i, j;
     size_t		z;
     herr_t      ret_value=SUCCEED;       /* Return value */
 
@@ -195,7 +195,7 @@ H5O_dtype_decode_helper(H5F_t *f, const uint8_t **pp, H5T_t *dt)
             if (NULL==dt->u.compnd.memb)
                 HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed");
             for (i = 0; i < dt->u.compnd.nmembs; i++) {
-                int ndims=0;     /* Number of dimensions of the array field */
+                unsigned ndims=0;     /* Number of dimensions of the array field */
                 hsize_t dim[H5O_LAYOUT_NDIMS];  /* Dimensions of the array */
                 int perm[H5O_LAYOUT_NDIMS];     /* Dimension permutations */
                 unsigned perm_word=0;    /* Dimension permutation information */
@@ -253,7 +253,7 @@ H5O_dtype_decode_helper(H5F_t *f, const uint8_t **pp, H5T_t *dt)
                             perm[j]=(perm_word>>(j*8))&0xff;
 
                         /* Create the array datatype for the field */
-                        if ((array_dt=H5T_array_create(temp_type,ndims,dim,perm))==NULL) {
+                        if ((array_dt=H5T_array_create(temp_type,(int)ndims,dim,perm))==NULL) {
                             for (j=0; j<=i; j++)
                                 H5MM_xfree(dt->u.compnd.memb[j].name);
                             H5MM_xfree(dt->u.compnd.memb);
@@ -311,7 +311,6 @@ H5O_dtype_decode_helper(H5F_t *f, const uint8_t **pp, H5T_t *dt)
              * Enumeration data types...
              */
             dt->u.enumer.nmembs = dt->u.enumer.nalloc = flags & 0xffff;
-            assert(dt->u.enumer.nmembs>=0);
             if (NULL==(dt->parent=H5FL_CALLOC(H5T_t)))
                 HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed");
             dt->parent->ent.header = HADDR_UNDEF;
@@ -405,13 +404,13 @@ H5O_dtype_decode_helper(H5F_t *f, const uint8_t **pp, H5T_t *dt)
             *pp += 3;
 
             /* Decode array dimension sizes & compute number of elements */
-            for (j=0, dt->u.array.nelem=1; j<dt->u.array.ndims; j++) {
+            for (j=0, dt->u.array.nelem=1; j<(unsigned)dt->u.array.ndims; j++) {
                 UINT32DECODE(*pp, dt->u.array.dim[j]);
                 dt->u.array.nelem *= dt->u.array.dim[j];
             } /* end for */
 
             /* Decode array dimension permutations (even though they are unused currently) */
-            for (j=0; j<dt->u.array.ndims; j++)
+            for (j=0; j<(unsigned)dt->u.array.ndims; j++)
                 UINT32DECODE(*pp, dt->u.array.perm[j]);
 
             /* Decode base type of array */
@@ -459,7 +458,7 @@ H5O_dtype_encode_helper(uint8_t **pp, const H5T_t *dt)
     htri_t has_array=FALSE;       /* Whether a compound datatype has an array inside it */
     unsigned		flags = 0;
     char		*hdr = (char *)*pp;
-    int		i, j;
+    unsigned		i, j;
     size_t		n, z, aligned;
     herr_t      ret_value=SUCCEED;       /* Return value */
 
@@ -776,11 +775,11 @@ H5O_dtype_encode_helper(uint8_t **pp, const H5T_t *dt)
             *(*pp)++ = '\0';
 
             /* Encode array dimensions */
-            for (j=0; j<dt->u.array.ndims; j++)
+            for (j=0; j<(unsigned)dt->u.array.ndims; j++)
                 UINT32ENCODE(*pp, dt->u.array.dim[j]);
 
             /* Encode array dimension permutations */
-            for (j=0; j<dt->u.array.ndims; j++)
+            for (j=0; j<(unsigned)dt->u.array.ndims; j++)
                 UINT32ENCODE(*pp, dt->u.array.perm[j]);
 
             /* Encode base type of array's information */
@@ -963,7 +962,7 @@ done:
 static size_t
 H5O_dtype_size(H5F_t *f, const void *mesg)
 {
-    int		    i;
+    unsigned		    i;
     size_t		    ret_value = 8;
     const H5T_t		   *dt = (const H5T_t *) mesg;
 
@@ -1205,7 +1204,7 @@ H5O_dtype_debug(H5F_t *f, hid_t dxpl_id, const void *mesg, FILE *stream,
     const H5T_t		*dt = (const H5T_t*)mesg;
     const char		*s;
     char		buf[256];
-    int		i;
+    unsigned		i;
     size_t		k;
     herr_t ret_value=SUCCEED;   /* Return value */
     
@@ -1341,12 +1340,12 @@ H5O_dtype_debug(H5F_t *f, hid_t dxpl_id, const void *mesg, FILE *stream,
 		"Rank:",
 		dt->u.array.ndims);
     fprintf(stream, "%*s%-*s {", indent, "", fwidth, "Dim Size:");
-	for (i=0; i<dt->u.array.ndims; i++) {
+	for (i=0; i<(unsigned)dt->u.array.ndims; i++) {
         fprintf (stream, "%s%u", i?", ":"", (unsigned)dt->u.array.dim[i]);
     }
     fprintf (stream, "}\n");
     fprintf(stream, "%*s%-*s {", indent, "", fwidth, "Dim Permutation:");
-	for (i=0; i<dt->u.array.ndims; i++) {
+	for (i=0; i<(unsigned)dt->u.array.ndims; i++) {
         fprintf (stream, "%s%d", i?", ":"", dt->u.array.perm[i]);
     }
     fprintf (stream, "}\n");
diff --git a/src/H5T.c b/src/H5T.c
index cea739e..8f09cbc 100644
--- a/src/H5T.c
+++ b/src/H5T.c
@@ -2470,7 +2470,7 @@ done:
 htri_t
 H5T_detect_class (const H5T_t *dt, H5T_class_t cls)
 {
-    int		i;
+    unsigned	i;
     htri_t      ret_value=FALSE;        /* Return value */
 
     FUNC_ENTER_NOAPI(H5T_detect_class, FAIL);
@@ -3530,7 +3530,7 @@ H5T_t *
 H5T_copy(const H5T_t *old_dt, H5T_copy_t method)
 {
     H5T_t	*new_dt=NULL, *tmp=NULL;
-    int	i;
+    unsigned	i;
     char	*s;
     H5T_t	*ret_value;
 
@@ -3605,7 +3605,7 @@ H5T_copy(const H5T_t *old_dt, H5T_copy_t method)
                  new_dt->u.compnd.nmembs * sizeof(H5T_cmemb_t));
 
             for (i=0; i<new_dt->u.compnd.nmembs; i++) {
-                int	j;
+                unsigned	j;
                 int    old_match;
 
                 s = new_dt->u.compnd.memb[i].name;
@@ -3773,7 +3773,7 @@ done:
 herr_t
 H5T_free(H5T_t *dt)
 {
-    int	i;
+    unsigned	i;
     herr_t      ret_value=SUCCEED;       /* Return value */
 
     FUNC_ENTER_NOAPI(H5T_free, FAIL);
@@ -4099,9 +4099,11 @@ H5T_get_size(const H5T_t *dt)
 int
 H5T_cmp(const H5T_t *dt1, const H5T_t *dt2)
 {
-    int	*idx1 = NULL, *idx2 = NULL;
+    unsigned	*idx1 = NULL, *idx2 = NULL;
     int	ret_value = 0;
-    int	i, j, tmp;
+    int	i, j;
+    unsigned u;
+    int	tmp;
     hbool_t	swapped;
     size_t	base_size;
 
@@ -4138,11 +4140,11 @@ H5T_cmp(const H5T_t *dt1, const H5T_t *dt2)
                 HGOTO_DONE(1);
 
             /* Build an index for each type so the names are sorted */
-            if (NULL==(idx1 = H5MM_malloc(dt1->u.compnd.nmembs * sizeof(int))) ||
-                    NULL==(idx2 = H5MM_malloc(dt1->u.compnd.nmembs * sizeof(int))))
+            if (NULL==(idx1 = H5MM_malloc(dt1->u.compnd.nmembs * sizeof(unsigned))) ||
+                    NULL==(idx2 = H5MM_malloc(dt1->u.compnd.nmembs * sizeof(unsigned))))
                 HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, 0, "memory allocation failed");
-            for (i=0; i<dt1->u.compnd.nmembs; i++)
-                idx1[i] = idx2[i] = i;
+            for (u=0; u<dt1->u.compnd.nmembs; u++)
+                idx1[u] = idx2[u] = u;
             for (i=dt1->u.compnd.nmembs-1, swapped=TRUE; swapped && i>=0; --i) {
                 for (j=0, swapped=FALSE; j<i; j++) {
                     if (HDstrcmp(dt1->u.compnd.memb[idx1[j]].name,
@@ -4168,35 +4170,31 @@ H5T_cmp(const H5T_t *dt1, const H5T_t *dt2)
 
 #ifdef H5T_DEBUG
             /* I don't quite trust the code above yet :-)  --RPM */
-            for (i=0; i<dt1->u.compnd.nmembs-1; i++) {
-                assert(HDstrcmp(dt1->u.compnd.memb[idx1[i]].name,
-                        dt1->u.compnd.memb[idx1[i + 1]].name));
-                assert(HDstrcmp(dt2->u.compnd.memb[idx2[i]].name,
-                        dt2->u.compnd.memb[idx2[i + 1]].name));
+            for (u=0; u<dt1->u.compnd.nmembs-1; u++) {
+                assert(HDstrcmp(dt1->u.compnd.memb[idx1[u]].name,
+                        dt1->u.compnd.memb[idx1[u + 1]].name));
+                assert(HDstrcmp(dt2->u.compnd.memb[idx2[u]].name,
+                        dt2->u.compnd.memb[idx2[u + 1]].name));
             }
 #endif
 
             /* Compare the members */
-            for (i=0; i<dt1->u.compnd.nmembs; i++) {
-                tmp = HDstrcmp(dt1->u.compnd.memb[idx1[i]].name,
-                       dt2->u.compnd.memb[idx2[i]].name);
+            for (u=0; u<dt1->u.compnd.nmembs; u++) {
+                tmp = HDstrcmp(dt1->u.compnd.memb[idx1[u]].name,
+                       dt2->u.compnd.memb[idx2[u]].name);
                 if (tmp < 0)
                     HGOTO_DONE(-1);
                 if (tmp > 0)
                     HGOTO_DONE(1);
 
-                if (dt1->u.compnd.memb[idx1[i]].offset <
-                dt2->u.compnd.memb[idx2[i]].offset) HGOTO_DONE(-1);
-                if (dt1->u.compnd.memb[idx1[i]].offset >
-                dt2->u.compnd.memb[idx2[i]].offset) HGOTO_DONE(1);
+                if (dt1->u.compnd.memb[idx1[u]].offset < dt2->u.compnd.memb[idx2[u]].offset) HGOTO_DONE(-1);
+                if (dt1->u.compnd.memb[idx1[u]].offset > dt2->u.compnd.memb[idx2[u]].offset) HGOTO_DONE(1);
 
-                if (dt1->u.compnd.memb[idx1[i]].size <
-                dt2->u.compnd.memb[idx2[i]].size) HGOTO_DONE(-1);
-                if (dt1->u.compnd.memb[idx1[i]].size >
-                dt2->u.compnd.memb[idx2[i]].size) HGOTO_DONE(1);
+                if (dt1->u.compnd.memb[idx1[u]].size < dt2->u.compnd.memb[idx2[u]].size) HGOTO_DONE(-1);
+                if (dt1->u.compnd.memb[idx1[u]].size > dt2->u.compnd.memb[idx2[u]].size) HGOTO_DONE(1);
 
-                tmp = H5T_cmp(dt1->u.compnd.memb[idx1[i]].type,
-                      dt2->u.compnd.memb[idx2[i]].type);
+                tmp = H5T_cmp(dt1->u.compnd.memb[idx1[u]].type,
+                      dt2->u.compnd.memb[idx2[u]].type);
                 if (tmp < 0) HGOTO_DONE(-1);
                 if (tmp > 0) HGOTO_DONE(1);
             }
@@ -4212,11 +4210,11 @@ H5T_cmp(const H5T_t *dt1, const H5T_t *dt2)
                 HGOTO_DONE(1);
 
             /* Build an index for each type so the names are sorted */
-            if (NULL==(idx1 = H5MM_malloc(dt1->u.enumer.nmembs * sizeof(int))) ||
-                    NULL==(idx2 = H5MM_malloc(dt1->u.enumer.nmembs * sizeof(int))))
+            if (NULL==(idx1 = H5MM_malloc(dt1->u.enumer.nmembs * sizeof(unsigned))) ||
+                    NULL==(idx2 = H5MM_malloc(dt1->u.enumer.nmembs * sizeof(unsigned))))
                 HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, 0, "memory allocation failed");
-            for (i=0; i<dt1->u.enumer.nmembs; i++)
-                idx1[i] = idx2[i] = i;
+            for (u=0; u<dt1->u.enumer.nmembs; u++)
+                idx1[u] = idx2[u] = u;
             for (i=dt1->u.enumer.nmembs-1, swapped=TRUE; swapped && i>=0; --i) {
                 for (j=0, swapped=FALSE; j<i; j++) {
                     if (HDstrcmp(dt1->u.enumer.name[idx1[j]],
@@ -4242,24 +4240,24 @@ H5T_cmp(const H5T_t *dt1, const H5T_t *dt2)
 
 #ifdef H5T_DEBUG
             /* I don't quite trust the code above yet :-)  --RPM */
-            for (i=0; i<dt1->u.enumer.nmembs-1; i++) {
-                assert(HDstrcmp(dt1->u.enumer.name[idx1[i]],
-                        dt1->u.enumer.name[idx1[i+1]]));
-                assert(HDstrcmp(dt2->u.enumer.name[idx2[i]],
-                        dt2->u.enumer.name[idx2[i+1]]));
+            for (u=0; u<dt1->u.enumer.nmembs-1; u++) {
+                assert(HDstrcmp(dt1->u.enumer.name[idx1[u]],
+                        dt1->u.enumer.name[idx1[u+1]]));
+                assert(HDstrcmp(dt2->u.enumer.name[idx2[u]],
+                        dt2->u.enumer.name[idx2[u+1]]));
             }
 #endif
 
             /* Compare the members */
             base_size = dt1->parent->size;
-            for (i=0; i<dt1->u.enumer.nmembs; i++) {
-                tmp = HDstrcmp(dt1->u.enumer.name[idx1[i]],
-                       dt2->u.enumer.name[idx2[i]]);
+            for (u=0; u<dt1->u.enumer.nmembs; u++) {
+                tmp = HDstrcmp(dt1->u.enumer.name[idx1[u]],
+                       dt2->u.enumer.name[idx2[u]]);
                 if (tmp<0) HGOTO_DONE(-1);
                 if (tmp>0) HGOTO_DONE(1);
 
-                tmp = HDmemcmp(dt1->u.enumer.value+idx1[i]*base_size,
-                       dt2->u.enumer.value+idx2[i]*base_size,
+                tmp = HDmemcmp(dt1->u.enumer.value+idx1[u]*base_size,
+                       dt2->u.enumer.value+idx2[u]*base_size,
                        base_size);
                 if (tmp<0) HGOTO_DONE(-1);
                 if (tmp>0) HGOTO_DONE(1);
@@ -5073,7 +5071,7 @@ H5T_set_loc(H5T_t *dt, H5F_t *f, H5T_loc_t loc)
 {
     htri_t changed;    /* Whether H5T_set_loc changed the type (even if the size didn't change) */
     htri_t ret_value = 0;   /* Indicate that success, but no location change */
-    int i;                  /* Local index variable */
+    unsigned i;             /* Local index variable */
     int accum_change;       /* Amount of change in the offset of the fields */
     size_t old_size;        /* Previous size of a field */
 
@@ -5271,7 +5269,7 @@ herr_t
 H5T_debug(const H5T_t *dt, FILE *stream)
 {
     const char	*s1="", *s2="";
-    int		i;
+    unsigned	i;
     size_t	k, base_size;
     uint64_t	tmp;
     herr_t ret_value=SUCCEED;   /* Return value */
diff --git a/src/H5Tcompound.c b/src/H5Tcompound.c
index e21f865..e919c02 100644
--- a/src/H5Tcompound.c
+++ b/src/H5Tcompound.c
@@ -38,7 +38,7 @@ static herr_t H5T_init_compound_interface(void);
 #define H5T_COMPND_INC	64	/*typical max numb of members per struct */
 
 /* Static local functions */
-static size_t H5T_get_member_offset(H5T_t *dt, int membno);
+static size_t H5T_get_member_offset(H5T_t *dt, unsigned membno);
 static herr_t H5T_pack(H5T_t *dt);
 
 
@@ -84,9 +84,17 @@ H5T_init_compound_interface(void)
  *
  *-------------------------------------------------------------------------
  */
+#ifdef H5_WANT_H5_V1_6_COMPAT
 size_t
-H5Tget_member_offset(hid_t type_id, int membno)
+H5Tget_member_offset(hid_t type_id, int _membno)
+#else /* H5_WANT_H5_V1_6_COMPAT */
+size_t
+H5Tget_member_offset(hid_t type_id, unsigned membno)
+#endif /* H5_WANT_H5_V1_6_COMPAT */
 {
+#ifdef H5_WANT_H5_V1_6_COMPAT
+    unsigned membno = (unsigned)_membno;
+#endif /* H5_WANT_H5_V1_6_COMPAT */
     H5T_t	*dt = NULL;
     size_t	ret_value;
 
@@ -96,7 +104,7 @@ H5Tget_member_offset(hid_t type_id, int membno)
     /* Check args */
     if (NULL == (dt = H5I_object_verify(type_id,H5I_DATATYPE)) || H5T_COMPOUND != dt->type)
 	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, 0, "not a compound datatype");
-    if (membno < 0 || membno >= dt->u.compnd.nmembs)
+    if (membno >= dt->u.compnd.nmembs)
 	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, 0, "invalid member number");
 
     /* Value */
@@ -111,7 +119,7 @@ done:
  * Function:	H5T_get_member_offset
  *
  * Purpose:	Private function for H5Tget_member_offset.  Returns the byte 
- *              offset of the beginning of a member with respect to the i
+ *              offset of the beginning of a member with respect to the
  *              beginning of the compound datatype datum.
  *
  * Return:	Success:	Byte offset.
@@ -129,14 +137,14 @@ done:
  *-------------------------------------------------------------------------
  */
 static size_t
-H5T_get_member_offset(H5T_t *dt, int membno)
+H5T_get_member_offset(H5T_t *dt, unsigned membno)
 {
     size_t	ret_value;
 
     FUNC_ENTER_NOAPI(H5T_get_member_offset, 0);
 
     assert(dt);
-    assert(membno >= 0 && membno < dt->u.compnd.nmembs);
+    assert(membno < dt->u.compnd.nmembs);
 
     /* Value */
     ret_value = dt->u.compnd.memb[membno].offset;
@@ -162,9 +170,17 @@ done:
  *
  *-------------------------------------------------------------------------
  */
+#ifdef H5_WANT_H5_V1_6_COMPAT
+H5T_class_t
+H5Tget_member_class(hid_t type_id, int _membno)
+#else /* H5_WANT_H5_V1_6_COMPAT */
 H5T_class_t
-H5Tget_member_class(hid_t type_id, int membno)
+H5Tget_member_class(hid_t type_id, unsigned membno)
+#endif /* H5_WANT_H5_V1_6_COMPAT */
 {
+#ifdef H5_WANT_H5_V1_6_COMPAT
+    unsigned membno = (unsigned)_membno;
+#endif /* H5_WANT_H5_V1_6_COMPAT */
     H5T_t	*dt = NULL;
     H5T_class_t	ret_value;
 
@@ -174,7 +190,7 @@ H5Tget_member_class(hid_t type_id, int membno)
     /* Check args */
     if (NULL == (dt = H5I_object_verify(type_id,H5I_DATATYPE)) || H5T_COMPOUND != dt->type)
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, H5T_NO_CLASS, "not a compound datatype");
-    if (membno < 0 || membno >= dt->u.compnd.nmembs)
+    if (membno >= dt->u.compnd.nmembs)
         HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, H5T_NO_CLASS, "invalid member number");
 
     /* Value */
@@ -209,9 +225,17 @@ done:
  *
  *-------------------------------------------------------------------------
  */
+#ifdef H5_WANT_H5_V1_6_COMPAT
 hid_t
-H5Tget_member_type(hid_t type_id, int membno)
+H5Tget_member_type(hid_t type_id, int _membno)
+#else /* H5_WANT_H5_V1_6_COMPAT */
+hid_t
+H5Tget_member_type(hid_t type_id, unsigned membno)
+#endif /* H5_WANT_H5_V1_6_COMPAT */
 {
+#ifdef H5_WANT_H5_V1_6_COMPAT
+    unsigned membno = (unsigned)_membno;
+#endif /* H5_WANT_H5_V1_6_COMPAT */
     H5T_t	*dt = NULL, *memb_dt = NULL;
     hid_t	ret_value;
 
@@ -221,7 +245,7 @@ H5Tget_member_type(hid_t type_id, int membno)
     /* Check args */
     if (NULL == (dt = H5I_object_verify(type_id,H5I_DATATYPE)) || H5T_COMPOUND != dt->type)
 	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a compound datatype");
-    if (membno < 0 || membno >= dt->u.compnd.nmembs)
+    if (membno >= dt->u.compnd.nmembs)
 	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid member number");
     if ((memb_dt=H5T_get_member_type(dt, membno))==NULL)
 	HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to retrieve member type");
@@ -229,7 +253,8 @@ H5Tget_member_type(hid_t type_id, int membno)
 	HGOTO_ERROR(H5E_DATATYPE, H5E_CANTREGISTER, FAIL, "unable register datatype atom");
     
 done:
-    if(ret_value<0) {
+    if(ret_value<0)
+{
         if(memb_dt!=NULL)
             H5T_close(memb_dt);
     } /* end if */
@@ -258,14 +283,14 @@ done:
  *-------------------------------------------------------------------------
  */
 H5T_t *
-H5T_get_member_type(H5T_t *dt, int membno)
+H5T_get_member_type(H5T_t *dt, unsigned membno)
 {
     H5T_t	*ret_value = NULL;
 
     FUNC_ENTER_NOAPI(H5T_get_member_type, NULL);
 
     assert(dt);
-    assert(membno >=0 && membno < dt->u.compnd.nmembs);
+    assert(membno < dt->u.compnd.nmembs);
     
     /* Copy datatype into an atom */
     if (NULL == (ret_value = H5T_copy(dt->u.compnd.memb[membno].type, H5T_COPY_REOPEN)))
@@ -389,8 +414,8 @@ done:
 herr_t
 H5T_insert(H5T_t *parent, const char *name, size_t offset, const H5T_t *member)
 {
-    int		idx, i;
-    size_t		total_size;
+    unsigned	idx, i;
+    size_t	total_size;
     herr_t      ret_value=SUCCEED;       /* Return value */
     
     FUNC_ENTER_NOAPI(H5T_insert, FAIL);
@@ -496,7 +521,7 @@ done:
 static herr_t
 H5T_pack(H5T_t *dt)
 {
-    int		i;
+    unsigned	i;
     size_t	offset;
     herr_t      ret_value=SUCCEED;       /* Return value */
 
diff --git a/src/H5Tconv.c b/src/H5Tconv.c
index 5695b08..47f96ba 100644
--- a/src/H5Tconv.c
+++ b/src/H5Tconv.c
@@ -1217,7 +1217,8 @@ static herr_t
 H5T_conv_struct_init (H5T_t *src, H5T_t *dst, H5T_cdata_t *cdata, hid_t dxpl_id)
 {
     H5T_conv_struct_t	*priv = (H5T_conv_struct_t*)(cdata->priv);
-    int		i, j, *src2dst = NULL;
+    int		*src2dst = NULL;
+    unsigned		i, j;
     H5T_t		*type = NULL;
     hid_t		tid;
     herr_t      ret_value=SUCCEED;       /* Return value */
@@ -1368,6 +1369,7 @@ H5T_conv_struct(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, hsize_t nelmts,
     size_t	offset;			/*byte offset wrt struct	*/
     size_t	src_delta;	    /*source stride	*/
     hsize_t	elmtno;
+    unsigned	u;		/*counters			*/
     int	i;			/*counters			*/
     H5T_conv_struct_t *priv = (H5T_conv_struct_t *)(cdata->priv);
     herr_t      ret_value=SUCCEED;       /* Return value */
@@ -1450,14 +1452,14 @@ H5T_conv_struct(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, hsize_t nelmts,
                  * data point as small as possible with all the free space on the
                  * right side.
                  */
-                for (i=0, offset=0; i<src->u.compnd.nmembs; i++) {
-                    if (src2dst[i]<0) continue; /*subsetting*/
-                    src_memb = src->u.compnd.memb + i;
-                    dst_memb = dst->u.compnd.memb + src2dst[i];
+                for (u=0, offset=0; u<src->u.compnd.nmembs; u++) {
+                    if (src2dst[u]<0) continue; /*subsetting*/
+                    src_memb = src->u.compnd.memb + u;
+                    dst_memb = dst->u.compnd.memb + src2dst[u];
 
                     if (dst_memb->size <= src_memb->size) {
-                        if (H5T_convert(priv->memb_path[i], priv->src_memb_id[i],
-                                priv->dst_memb_id[src2dst[i]],
+                        if (H5T_convert(priv->memb_path[u], priv->src_memb_id[u],
+                                priv->dst_memb_id[src2dst[u]],
                                 (hsize_t)1, 0, 0, /*no striding (packed array)*/
                                 xbuf+src_memb->offset, xbkg+dst_memb->offset,
                                 dxpl_id)<0)
@@ -1600,6 +1602,7 @@ H5T_conv_struct_opt(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
     H5T_cmemb_t	*dst_memb = NULL;	/*destination struct memb desc.	*/
     size_t	offset;			/*byte offset wrt struct	*/
     hsize_t	elmtno;			/*element counter		*/
+    unsigned	u;			/*counters			*/
     int	i;			    /*counters			*/
     H5T_conv_struct_t *priv = NULL;	/*private data			*/
     herr_t      ret_value=SUCCEED;       /* Return value */
@@ -1637,11 +1640,11 @@ H5T_conv_struct_opt(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
              * is room for each conversion instead of actually doing anything.
              */
             if (dst->size > src->size) {
-                for (i=0, offset=0; i<src->u.compnd.nmembs; i++) {
-                    if (src2dst[i]<0)
+                for (u=0, offset=0; u<src->u.compnd.nmembs; u++) {
+                    if (src2dst[u]<0)
                         continue;
-                    src_memb = src->u.compnd.memb + i;
-                    dst_memb = dst->u.compnd.memb + src2dst[i];
+                    src_memb = src->u.compnd.memb + u;
+                    dst_memb = dst->u.compnd.memb + src2dst[u];
                     if (dst_memb->size > src_memb->size)
                         offset += src_memb->size;
                 }
@@ -1718,17 +1721,17 @@ H5T_conv_struct_opt(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
              * destination in the bkg buffer. Otherwise move the element as far
              * left as possible in the buffer.
              */
-            for (i=0, offset=0; i<src->u.compnd.nmembs; i++) {
-                if (src2dst[i]<0) continue; /*subsetting*/
-                src_memb = src->u.compnd.memb + i;
-                dst_memb = dst->u.compnd.memb + src2dst[i];
+            for (u=0, offset=0; u<src->u.compnd.nmembs; u++) {
+                if (src2dst[u]<0) continue; /*subsetting*/
+                src_memb = src->u.compnd.memb + u;
+                dst_memb = dst->u.compnd.memb + src2dst[u];
 
                 if (dst_memb->size <= src_memb->size) {
                     xbuf = buf + src_memb->offset;
                     xbkg = bkg + dst_memb->offset;
-                    if (H5T_convert(priv->memb_path[i],
-                            priv->src_memb_id[i],
-                            priv->dst_memb_id[src2dst[i]], nelmts,
+                    if (H5T_convert(priv->memb_path[u],
+                            priv->src_memb_id[u],
+                            priv->dst_memb_id[src2dst[u]], nelmts,
                             buf_stride ? buf_stride : src->size,
                             bkg_stride, xbuf, xbkg,
                             dxpl_id)<0)
@@ -1820,8 +1823,8 @@ H5T_conv_enum_init(H5T_t *src, H5T_t *dst, H5T_cdata_t *cdata)
     int		n;		/*src value cast as native int	*/
     int		domain[2];	/*min and max source values	*/
     int		*map=NULL;	/*map from src value to dst idx	*/
-    int		length;		/*nelmts in map array		*/
-    int		i, j;		/*counters			*/
+    unsigned	length;		/*nelmts in map array		*/
+    unsigned	i, j;		/*counters			*/
     herr_t      ret_value=SUCCEED;       /* Return value */
     
     FUNC_ENTER_NOINIT(H5T_conv_enum_init);
diff --git a/src/H5Tenum.c b/src/H5Tenum.c
index 95c514f..56ac80d 100644
--- a/src/H5Tenum.c
+++ b/src/H5Tenum.c
@@ -220,7 +220,7 @@ done:
 herr_t
 H5T_enum_insert(H5T_t *dt, const char *name, void *value)
 {
-    int		i;
+    unsigned	i;
     char	**names=NULL;
     uint8_t	*values=NULL;
     herr_t      ret_value=SUCCEED;       /* Return value */
@@ -280,9 +280,17 @@ done:
  *
  *-------------------------------------------------------------------------
  */
+#ifdef H5_WANT_H5_V1_6_COMPAT
 herr_t
-H5Tget_member_value(hid_t type, int membno, void *value/*out*/)
+H5Tget_member_value(hid_t type, int _membno, void *value/*out*/)
+#else /* H5_WANT_H5_V1_6_COMPAT */
+herr_t
+H5Tget_member_value(hid_t type, unsigned membno, void *value/*out*/)
+#endif /* H5_WANT_H5_V1_6_COMPAT */
 {
+#ifdef H5_WANT_H5_V1_6_COMPAT
+    unsigned membno = (unsigned)_membno;
+#endif /* H5_WANT_H5_V1_6_COMPAT */
     H5T_t	*dt=NULL;
     herr_t      ret_value=SUCCEED;       /* Return value */
     
@@ -293,7 +301,7 @@ H5Tget_member_value(hid_t type, int membno, void *value/*out*/)
 	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data type");
     if (H5T_ENUM!=dt->type)
 	HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "operation not defined for data type class");
-    if (membno<0 || membno>=dt->u.enumer.nmembs)
+    if (membno>=dt->u.enumer.nmembs)
 	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid member number");
     if (!value)
 	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "null value buffer");
@@ -324,7 +332,7 @@ done:
  *-------------------------------------------------------------------------
  */
 herr_t
-H5T_get_member_value(H5T_t *dt, int membno, void *value/*out*/)
+H5T_get_member_value(H5T_t *dt, unsigned membno, void *value/*out*/)
 {
     herr_t      ret_value=SUCCEED;       /* Return value */
     
diff --git a/src/H5Tfields.c b/src/H5Tfields.c
index b14a53d..b3baa8e 100644
--- a/src/H5Tfields.c
+++ b/src/H5Tfields.c
@@ -19,14 +19,16 @@
 
 #define H5T_PACKAGE		/*suppress error about including H5Tpkg	  */
 
+/* Pablo information */
+/* (Put before include files to avoid problems with inline functions) */
+#define PABLO_MASK	H5Tfields_mask
+
 #include "H5private.h"		/*generic functions			  */
 #include "H5Eprivate.h"		/*error handling			  */
 #include "H5Iprivate.h"		/*ID functions		   		  */
 #include "H5MMprivate.h"	/*memory management			  */
 #include "H5Tpkg.h"		/*data-type functions			  */
 
-#define PABLO_MASK	H5Tfields_mask
-
 /* Interface initialization */
 static int interface_initialize_g = 0;
 #define INTERFACE_INIT H5T_init_fields_interface
@@ -49,9 +51,9 @@ DESCRIPTION
 static herr_t
 H5T_init_fields_interface(void)
 {
-    FUNC_ENTER_NOINIT(H5T_init_fields_interface);
+    FUNC_ENTER_NOINIT(H5T_init_fields_interface)
 
-    FUNC_LEAVE_NOAPI(H5T_init());
+    FUNC_LEAVE_NOAPI(H5T_init())
 } /* H5T_init_fields_interface() */
 
 
@@ -59,9 +61,9 @@ H5T_init_fields_interface(void)
  * Function:	H5Tget_nmembers
  *
  * Purpose:	Determines how many members TYPE_ID has.  The type must be
- *		either a compound data type or an enumeration data type.
+ *		either a compound datatype or an enumeration datatype.
  *
- * Return:	Success:	Number of members defined in the data type.
+ * Return:	Success:	Number of members defined in the datatype.
  *
  *		Failure:	Negative
  *
@@ -72,7 +74,7 @@ H5T_init_fields_interface(void)
  *
  * Modifications:
  *	Robb Matzke, 22 Dec 1998
- *	Also works with enumeration data types.
+ *	Also works with enumeration datatypes.
  *-------------------------------------------------------------------------
  */
 int
@@ -81,18 +83,18 @@ H5Tget_nmembers(hid_t type_id)
     H5T_t	*dt = NULL;
     int	ret_value;
 
-    FUNC_ENTER_API(H5Tget_num_members, FAIL);
+    FUNC_ENTER_API(H5Tget_num_members, FAIL)
     H5TRACE1("Is","i",type_id);
 
     /* Check args */
     if (NULL == (dt = H5I_object_verify(type_id,H5I_DATATYPE)))
-	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data type");
+	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype")
 
     if((ret_value = H5T_get_nmembers(dt))<0)
-	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "cannot return member number");
+	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "cannot return member number")
     
 done:
-    FUNC_LEAVE_API(ret_value);
+    FUNC_LEAVE_API(ret_value)
 }
 
 
@@ -101,9 +103,9 @@ done:
  *
  * Purpose:	Private function for H5Tget_nmembers.  Determines how many 
  *              members DTYPE has.  The type must be either a compound data
- *              type or an enumeration data type.
+ *              type or an enumeration datatype.
  *
- * Return:	Success:	Number of members defined in the data type.
+ * Return:	Success:	Number of members defined in the datatype.
  *
  *		Failure:	Negative
  *
@@ -121,19 +123,19 @@ H5T_get_nmembers(const H5T_t *dt)
 {
     int	ret_value;
 
-    FUNC_ENTER_NOAPI(H5T_get_nmembers, FAIL);
+    FUNC_ENTER_NOAPI(H5T_get_nmembers, FAIL)
 
     assert(dt);
 
     if (H5T_COMPOUND==dt->type)
-	ret_value = dt->u.compnd.nmembs;
+	ret_value = (int)dt->u.compnd.nmembs;
     else if (H5T_ENUM==dt->type)
-	ret_value = dt->u.enumer.nmembs;
+	ret_value = (int)dt->u.enumer.nmembs;
     else
-	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "operation not supported for type class");
+	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "operation not supported for type class")
     
 done:
-    FUNC_LEAVE_NOAPI(ret_value);
+    FUNC_LEAVE_NOAPI(ret_value)
 }
 
 
@@ -141,7 +143,7 @@ done:
  * Function:	H5Tget_member_name
  *
  * Purpose:	Returns the name of a member of a compound or enumeration
- *		data type. Members are stored in no particular order with
+ *		datatype. Members are stored in no particular order with
  *		numbers 0 through N-1 where N is the value returned by
  *		H5Tget_nmembers().
  *
@@ -155,26 +157,34 @@ done:
  *
  * Modifications:
  *	Robb Matzke, 22 Dec 1998
- *	Also works with enumeration data types.
+ *	Also works with enumeration datatypes.
  *-------------------------------------------------------------------------
  */
+#ifdef H5_WANT_H5_V1_6_COMPAT
+char *
+H5Tget_member_name(hid_t type_id, int _membno)
+#else /* H5_WANT_H5_V1_6_COMPAT */
 char *
-H5Tget_member_name(hid_t type_id, int membno)
+H5Tget_member_name(hid_t type_id, unsigned membno)
+#endif /* H5_WANT_H5_V1_6_COMPAT */
 {
+#ifdef H5_WANT_H5_V1_6_COMPAT
+    unsigned membno = (unsigned)_membno;
+#endif /* H5_WANT_H5_V1_6_COMPAT */
     H5T_t	*dt = NULL;
     char	*ret_value;
 
-    FUNC_ENTER_API(H5Tget_member_name, NULL);
+    FUNC_ENTER_API(H5Tget_member_name, NULL)
 
     /* Check args */
     if (NULL == (dt = H5I_object_verify(type_id,H5I_DATATYPE)))
-	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a data type");
+	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a datatype")
 
     if((ret_value = H5T_get_member_name(dt, membno))==NULL)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "unable to get member name");
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "unable to get member name")
 
 done:
-    FUNC_LEAVE_API(ret_value);
+    FUNC_LEAVE_API(ret_value)
 }
 
 
@@ -182,7 +192,7 @@ done:
  * Function:	H5T_get_member_name
  *
  * Purpose:	Private function for H5Tget_member_name.  Returns the name 
- *              of a member of a compound or enumeration data type. Members
+ *              of a member of a compound or enumeration datatype. Members
  *              are stored in no particular order with numbers 0 through 
  *              N-1 where N is the value returned by H5Tget_nmembers().
  *
@@ -198,33 +208,33 @@ done:
  *-------------------------------------------------------------------------
  */
 char *
-H5T_get_member_name(H5T_t *dt, int membno)
+H5T_get_member_name(H5T_t const *dt, unsigned membno)
 {
     char	*ret_value;
 
-    FUNC_ENTER_NOAPI(H5T_get_member_name, NULL);
+    FUNC_ENTER_NOAPI(H5T_get_member_name, NULL)
 
     assert(dt);
 
     switch (dt->type) {
         case H5T_COMPOUND:
-            if (membno<0 || membno>=dt->u.compnd.nmembs)
-                HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "invalid member number");
+            if (membno>=dt->u.compnd.nmembs)
+                HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "invalid member number")
             ret_value = H5MM_xstrdup(dt->u.compnd.memb[membno].name);
             break;
 
         case H5T_ENUM:
-            if (membno<0 || membno>=dt->u.enumer.nmembs)
-                HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "invalid member number");
+            if (membno>=dt->u.enumer.nmembs)
+                HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "invalid member number")
             ret_value = H5MM_xstrdup(dt->u.enumer.name[membno]);
             break;
             
         default:
-            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "operation not supported for type class");
+            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "operation not supported for type class")
     }
 
 done:
-    FUNC_LEAVE_NOAPI(ret_value);
+    FUNC_LEAVE_NOAPI(ret_value)
 }
 
 
@@ -232,7 +242,7 @@ done:
  * Function:    H5Tget_member_index
  *
  * Purpose:     Returns the index of a member in a compound or enumeration
- *              data type by given name.Members are stored in no particular 
+ *              datatype by given name.Members are stored in no particular 
  *              order with numbers 0 through N-1 where N is the value 
  *              returned by H5Tget_nmembers().
  *      
@@ -251,47 +261,45 @@ H5Tget_member_index(hid_t type_id, const char *name)
 {
     H5T_t       *dt = NULL;
     int         ret_value=FAIL;
-    int         nmembs, i;
+    unsigned    i;
 
-    FUNC_ENTER_API(H5Tget_member_index, FAIL);
+    FUNC_ENTER_API(H5Tget_member_index, FAIL)
     H5TRACE2("Is","is",type_id,name);
 
     /* Check arguments */
     assert(name);
     if(NULL==(dt=H5I_object_verify(type_id,H5I_DATATYPE)))
-        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data type");
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype")
 
     /* Locate member by name */
     switch (dt->type) {
         case H5T_COMPOUND:
-            nmembs = dt->u.compnd.nmembs;
-            for(i=0; i<nmembs; i++) {
+            for(i=0; i< dt->u.compnd.nmembs; i++) {
                 if(!HDstrcmp(dt->u.compnd.memb[i].name, name))
-                    HGOTO_DONE(i);
+                    HGOTO_DONE((int)i)
             }
             break;  
         case H5T_ENUM:
-            nmembs = dt->u.enumer.nmembs;
-            for(i=0; i<nmembs; i++) {
+            for(i=0; i< dt->u.enumer.nmembs; i++) {
                 if(!HDstrcmp(dt->u.enumer.name[i], name))
-                    HGOTO_DONE(i);
+                    HGOTO_DONE((int)i)
             }
             break;
         default:
-            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "operation not supported for this type");
+            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "operation not supported for this type")
     }
 
 done:
-    FUNC_LEAVE_API(ret_value);
+    FUNC_LEAVE_API(ret_value)
 }
 
 
 /*-------------------------------------------------------------------------
  * Function:	H5T_sort_value
  *
- * Purpose:	Sorts the members of a compound data type by their offsets;
+ * Purpose:	Sorts the members of a compound datatype by their offsets;
  *		sorts the members of an enum type by their values. This even
- *		works for locked data types since it doesn't change the value
+ *		works for locked datatypes since it doesn't change the value
  *		of the type.  MAP is an optional parallel integer array which
  *		is also swapped along with members of DT.
  *
@@ -307,13 +315,13 @@ done:
 herr_t
 H5T_sort_value(H5T_t *dt, int *map)
 {
-    int		i, j, nmembs;
+    unsigned	i, j, nmembs;
     size_t	size;
     hbool_t	swapped;
     uint8_t	tbuf[32];
     herr_t ret_value=SUCCEED;   /* Return value */
 
-    FUNC_ENTER_NOAPI(H5T_sort_value, FAIL);
+    FUNC_ENTER_NOAPI(H5T_sort_value, FAIL)
 
     /* Check args */
     assert(dt);
@@ -393,15 +401,15 @@ H5T_sort_value(H5T_t *dt, int *map)
     }
     
 done:
-    FUNC_LEAVE_NOAPI(ret_value);
+    FUNC_LEAVE_NOAPI(ret_value)
 }
 
 
 /*-------------------------------------------------------------------------
  * Function:	H5T_sort_name
  *
- * Purpose:	Sorts members of a compound or enumeration data type by their
- *		names. This even works for locked data types since it doesn't
+ * Purpose:	Sorts members of a compound or enumeration datatype by their
+ *		names. This even works for locked datatypes since it doesn't
  *		change the value of the types.
  *
  * Return:	Success:	Non-negative
@@ -418,13 +426,13 @@ done:
 herr_t
 H5T_sort_name(H5T_t *dt, int *map)
 {
-    int		i, j, nmembs;
+    unsigned	i, j, nmembs;
     size_t	size;
     hbool_t	swapped;
     uint8_t	tbuf[32];
     herr_t ret_value=SUCCEED;   /* Return value */
 
-    FUNC_ENTER_NOAPI(H5T_sort_name, FAIL);
+    FUNC_ENTER_NOAPI(H5T_sort_name, FAIL)
 
     /* Check args */
     assert(dt);
@@ -500,6 +508,6 @@ H5T_sort_name(H5T_t *dt, int *map)
     }
     
 done:
-    FUNC_LEAVE_NOAPI(ret_value);
+    FUNC_LEAVE_NOAPI(ret_value)
 }
 
diff --git a/src/H5Tnative.c b/src/H5Tnative.c
index cf6a953..f013271 100644
--- a/src/H5Tnative.c
+++ b/src/H5Tnative.c
@@ -159,11 +159,12 @@ H5T_get_native_type(H5T_t *dtype, H5T_direction_t direction, size_t *struct_alig
     H5T_t       *dt;                /* Datatype to make native */
     H5T_class_t h5_class;           /* Class of datatype to make native */
     size_t      size;               /* Size of datatype to make native */
-    int         nmemb;              /* Number of members in compound & enum types */
+    int         snmemb;             /* Number of members in compound & enum types */
+    unsigned    nmemb;              /* Number of members in compound & enum types */
     H5T_t       *super_type;        /* Super type of VL, array and enum datatypes */
     H5T_t       *nat_super_type;    /* Native form of VL, array & enum super datatype */
     H5T_t       *new_type=NULL;     /* New native datatype */
-    int         i;                  /* Local index variable */
+    unsigned    i;                  /* Local index variable */
     H5T_t       *ret_value;         /* Return value */
 
     FUNC_ENTER_NOAPI(H5T_get_native_type, NULL)
@@ -257,15 +258,15 @@ H5T_get_native_type(H5T_t *dtype, H5T_direction_t direction, size_t *struct_alig
                 size_t      children_st_align=0;    /* The max alignment among compound members.  This'll be the compound alignment */
                 char        **comp_mname;   /* List of member names in compound type */
 
-                if((nmemb = H5T_get_nmembers(dtype))<=0)
+                if((snmemb = H5T_get_nmembers(dtype))<=0)
                     HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "compound data type doesn't have any member")
+                H5_ASSIGN_OVERFLOW(nmemb,snmemb,int,unsigned);
                 
-                H5_CHECK_OVERFLOW(nmemb,int,size_t);
-                if((memb_list   = (H5T_t**)H5MM_malloc((size_t)nmemb*sizeof(H5T_t*)))==NULL)
+                if((memb_list   = (H5T_t**)H5MM_malloc(nmemb*sizeof(H5T_t*)))==NULL)
                     HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "cannot allocate memory")
-                if((memb_offset = (size_t*)H5MM_calloc((size_t)nmemb*sizeof(size_t)))==NULL)
+                if((memb_offset = (size_t*)H5MM_calloc(nmemb*sizeof(size_t)))==NULL)
                     HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "cannot allocate memory")
-                if((comp_mname = (char**)H5MM_malloc((size_t)nmemb*sizeof(char*)))==NULL)
+                if((comp_mname = (char**)H5MM_malloc(nmemb*sizeof(char*)))==NULL)
                     HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "cannot allocate memory")
 
                 /* Construct child compound type and retrieve a list of their IDs, offsets, total size, and alignment for compound type. */  
@@ -352,8 +353,9 @@ H5T_get_native_type(H5T_t *dtype, H5T_direction_t direction, size_t *struct_alig
                     HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "unable to create enum type")
                     
                 /* Retrieve member info and insert members into new enum type */
-                if((nmemb = H5T_get_nmembers(dtype))<=0)
+                if((snmemb = H5T_get_nmembers(dtype))<=0)
                     HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "enumarate data type doesn't have any member")
+                H5_ASSIGN_OVERFLOW(nmemb,snmemb,int,unsigned);
                 for(i=0; i<nmemb; i++) {
                     if((memb_name=H5T_get_member_name(dtype, i))==NULL)
                         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "cannot get member name")
@@ -384,7 +386,8 @@ H5T_get_native_type(H5T_t *dtype, H5T_direction_t direction, size_t *struct_alig
 
         case H5T_ARRAY:
             {
-                int         array_rank;         /* Array's rank */
+                int         sarray_rank;        /* Array's rank */
+                unsigned    array_rank;         /* Array's rank */
                 hsize_t     *dims = NULL;       /* Dimension sizes for array */
                 hsize_t     nelems = 1;
                 size_t      super_offset=0;       
@@ -392,10 +395,10 @@ H5T_get_native_type(H5T_t *dtype, H5T_direction_t direction, size_t *struct_alig
                 size_t      super_align=0;   
 
                 /* Retrieve dimension information for array data type */
-                if((array_rank=H5T_get_array_ndims(dtype))<=0)
+                if((sarray_rank=H5T_get_array_ndims(dtype))<=0)
                     HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "cannot get dimension rank")
-                H5_CHECK_OVERFLOW(array_rank,int,size_t);
-                if((dims = (hsize_t*)H5MM_malloc((size_t)array_rank*sizeof(hsize_t)))==NULL)
+                H5_ASSIGN_OVERFLOW(array_rank,sarray_rank,int,unsigned);
+                if((dims = (hsize_t*)H5MM_malloc(array_rank*sizeof(hsize_t)))==NULL)
                     HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "cannot allocate memory")
                 if(H5T_get_array_dims(dtype, dims, NULL)<0)
                     HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "cannot get dimension size")
@@ -412,7 +415,7 @@ H5T_get_native_type(H5T_t *dtype, H5T_direction_t direction, size_t *struct_alig
                     HGOTO_ERROR(H5E_ARGS, H5E_CLOSEERROR, NULL, "cannot close datatype")
 
                 /* Create a new array type based on native type */
-                if((new_type=H5T_array_create(nat_super_type, array_rank, dims, NULL))==NULL) 
+                if((new_type=H5T_array_create(nat_super_type, sarray_rank, dims, NULL))==NULL) 
                     HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "unable to create array type")
 
                 /* Close base type */
diff --git a/src/H5Tpkg.h b/src/H5Tpkg.h
index 2058e6a..dba89bc 100644
--- a/src/H5Tpkg.h
+++ b/src/H5Tpkg.h
@@ -125,8 +125,8 @@ typedef enum H5T_sort_t {
 
 /* A compound datatype */
 typedef struct H5T_compnd_t {
-    int		nalloc;		/*num entries allocated in MEMB array*/
-    int		nmembs;		/*number of members defined in struct*/
+    unsigned	nalloc;		/*num entries allocated in MEMB array*/
+    unsigned	nmembs;		/*number of members defined in struct*/
     H5T_sort_t	sorted;		/*how are members sorted?	     */
     hbool_t     packed;		/*are members packed together?       */
     struct H5T_cmemb_t	*memb;	/*array of struct members	     */
@@ -134,8 +134,8 @@ typedef struct H5T_compnd_t {
 
 /* An enumeration datatype */
 typedef struct H5T_enum_t {
-    int		nalloc;		/*num entries allocated		     */
-    int		nmembs;		/*number of members defined in enum  */
+    unsigned	nalloc;		/*num entries allocated		     */
+    unsigned	nmembs;		/*number of members defined in enum  */
     H5T_sort_t	sorted;		/*how are members sorted?	     */
     uint8_t	*value;		/*array of values		     */
     char	**name;		/*array of symbol names		     */
@@ -305,11 +305,11 @@ H5_DLLVAR size_t	H5T_NATIVE_UINT_FAST64_ALIGN_g;
 H5_DLL herr_t H5T_init_interface(void);
 H5_DLL H5T_t *H5T_create(H5T_class_t type, size_t size);
 H5_DLL herr_t H5T_free(H5T_t *dt);
-H5_DLL H5T_sign_t H5T_get_sign(H5T_t *dt);
+H5_DLL H5T_sign_t H5T_get_sign(H5T_t const *dt);
 H5_DLL H5T_t *H5T_get_super(H5T_t *dt);
-H5_DLL char  *H5T_get_member_name(H5T_t *dt, int membno);
-H5_DLL herr_t H5T_get_member_value(H5T_t *dt, int membno, void *value);
-H5_DLL H5T_t *H5T_get_member_type(H5T_t *dt, int membno);
+H5_DLL char  *H5T_get_member_name(H5T_t const *dt, unsigned membno);
+H5_DLL herr_t H5T_get_member_value(H5T_t *dt, unsigned membno, void *value);
+H5_DLL H5T_t *H5T_get_member_type(H5T_t *dt, unsigned membno);
 H5_DLL int H5T_get_nmembers(const H5T_t *dt);
 H5_DLL herr_t H5T_insert(H5T_t *parent, const char *name, size_t offset,
         const H5T_t *member);
diff --git a/src/H5Tpublic.h b/src/H5Tpublic.h
index 1c0084e..13c8a33 100644
--- a/src/H5Tpublic.h
+++ b/src/H5Tpublic.h
@@ -523,13 +523,23 @@ H5_DLL H5T_norm_t H5Tget_norm(hid_t type_id);
 H5_DLL H5T_pad_t H5Tget_inpad(hid_t type_id);
 H5_DLL H5T_str_t H5Tget_strpad(hid_t type_id);
 H5_DLL int H5Tget_nmembers(hid_t type_id);
+#ifdef H5_WANT_H5_V1_6_COMPAT
 H5_DLL char *H5Tget_member_name(hid_t type_id, int membno);
+#else /* H5_WANT_H5_V1_6_COMPAT */
+H5_DLL char *H5Tget_member_name(hid_t type_id, unsigned membno);
+#endif /* H5_WANT_H5_V1_6_COMPAT */
 H5_DLL int H5Tget_member_index(hid_t type_id, const char *name);
+#ifdef H5_WANT_H5_V1_6_COMPAT
 H5_DLL size_t H5Tget_member_offset(hid_t type_id, int membno);
 H5_DLL H5T_class_t H5Tget_member_class(hid_t type_id, int membno);
 H5_DLL hid_t H5Tget_member_type(hid_t type_id, int membno);
-H5_DLL herr_t H5Tget_member_value(hid_t type_id, int membno,
-				   void *value/*out*/);
+H5_DLL herr_t H5Tget_member_value(hid_t type_id, int membno, void *value/*out*/);
+#else /* H5_WANT_H5_V1_6_COMPAT */
+H5_DLL size_t H5Tget_member_offset(hid_t type_id, unsigned membno);
+H5_DLL H5T_class_t H5Tget_member_class(hid_t type_id, unsigned membno);
+H5_DLL hid_t H5Tget_member_type(hid_t type_id, unsigned membno);
+H5_DLL herr_t H5Tget_member_value(hid_t type_id, unsigned membno, void *value/*out*/);
+#endif /* H5_WANT_H5_V1_6_COMPAT */
 H5_DLL H5T_cset_t H5Tget_cset(hid_t type_id);
 H5_DLL htri_t H5Tis_variable_str(hid_t type_id);
 H5_DLL hid_t H5Tget_native_type(hid_t type_id, H5T_direction_t direction); 
diff --git a/src/H5Tvlen.c b/src/H5Tvlen.c
index 1946136..1b113a7 100644
--- a/src/H5Tvlen.c
+++ b/src/H5Tvlen.c
@@ -717,8 +717,7 @@ done:
 static herr_t 
 H5T_vlen_reclaim_recurse(void *elem, const H5T_t *dt, H5MM_free_t free_func, void *free_info)
 {
-    int i;     /* local index variable */
-    size_t j;   /* local index variable */
+    unsigned i;     /* local index variable */
     herr_t ret_value = SUCCEED;
 
     FUNC_ENTER_NOINIT(H5T_vlen_reclaim_recurse)
@@ -734,8 +733,8 @@ H5T_vlen_reclaim_recurse(void *elem, const H5T_t *dt, H5MM_free_t free_func, voi
                 void *off;     /* offset of field */
 
                 /* Calculate the offset member and recurse on it */
-                for(j=0; j<dt->u.array.nelem; j++) {
-                    off=((uint8_t *)elem)+j*(dt->parent->size);
+                for(i=0; i<dt->u.array.nelem; i++) {
+                    off=((uint8_t *)elem)+i*(dt->parent->size);
                     if(H5T_vlen_reclaim_recurse(off,dt->parent,free_func,free_info)<0)
                         HGOTO_ERROR(H5E_DATATYPE, H5E_CANTFREE, FAIL, "Unable to free array element")
                 } /* end for */
diff --git a/test/tattr.c b/test/tattr.c
index ff64862..653269c 100644
--- a/test/tattr.c
+++ b/test/tattr.c
@@ -563,7 +563,7 @@ test_attr_compound_read(void)
     fields=H5Tget_nmembers(type);
     VERIFY(fields, 3, "H5Tget_nmembers");
     for(i=0; i<fields; i++) {
-        fieldname=H5Tget_member_name(type,i);
+        fieldname=H5Tget_member_name(type,(unsigned)i);
         if(!(HDstrcmp(fieldname,ATTR4_FIELDNAME1) || 
                 HDstrcmp(fieldname,ATTR4_FIELDNAME2) ||
                 HDstrcmp(fieldname,ATTR4_FIELDNAME3))) {
diff --git a/tools/h5dump/h5dump.c b/tools/h5dump/h5dump.c
index 84bf544..24a0e08 100644
--- a/tools/h5dump/h5dump.c
+++ b/tools/h5dump/h5dump.c
@@ -619,8 +619,11 @@ static void
 print_datatype(hid_t type,unsigned in_group)
 {
     char       *fname;
-    hid_t       nmembers, mtype, str_type;
-    int         i, j, ndims, perm[H5DUMP_MAX_RANK];
+    hid_t       mtype, str_type;
+    unsigned    nmembers;
+    int         perm[H5DUMP_MAX_RANK];
+    unsigned    ndims;
+    unsigned    i;
     size_t      size=0;
     hsize_t     dims[H5DUMP_MAX_RANK];
     H5T_str_t   str_pad;
@@ -629,16 +632,17 @@ print_datatype(hid_t type,unsigned in_group)
     hid_t       super;
     hid_t       tmp_type;
     htri_t      is_vlstr=FALSE;
+    herr_t      ret;            /* Generic return value */
 
     if (!in_group && H5Tcommitted(type) > 0) {
         H5Gget_objinfo(type, ".", TRUE, &statbuf);
-        i = search_obj(type_table, statbuf.objno);
+        ret = search_obj(type_table, statbuf.objno);
 
-        if (i >= 0) {
-            if (!type_table->objs[i].recorded)
-                HDfprintf(stdout,"\"/#%a\"", type_table->objs[i].objno);
+        if (ret >= 0) {
+            if (!type_table->objs[ret].recorded)
+                HDfprintf(stdout,"\"/#%a\"", type_table->objs[ret].objno);
             else
-                printf("\"%s\"", type_table->objs[i].objname);
+                printf("\"%s\"", type_table->objs[ret].objname);
         } else {
             error_msg(progname, "unknown committed type.\n");
             d_status = EXIT_FAILURE;
@@ -901,8 +905,8 @@ print_datatype(hid_t type,unsigned in_group)
             H5Tget_array_dims(type, dims, perm);
 
             /* Print array dimensions */
-            for (j = 0; j < ndims; j++)
-                printf("[%d]", (int) dims[j]);
+            for (i = 0; i < ndims; i++)
+                printf("[%d]", (int) dims[i]);
 
             printf(" ");
 
@@ -3004,14 +3008,15 @@ print_enum(hid_t type)
 {
     char           **name = NULL;   /*member names                   */
     unsigned char   *value = NULL;  /*value array                    */
-    int              nmembs;        /*number of members              */
+    unsigned         nmembs;        /*number of members              */
     int              nchars;        /*number of output characters    */
     hid_t            super;         /*enum base integer type         */
     hid_t            native = -1;   /*native integer data type       */
     size_t           dst_size;      /*destination value type size    */
-    int              i;
+    unsigned         i;
 
     nmembs = H5Tget_nmembers(type);
+    assert(nmembs>0);
     super = H5Tget_super(type);
 
     /*
@@ -3034,9 +3039,8 @@ print_enum(hid_t type)
     }
 
     /* Get the names and raw values of all members */
-    assert(nmembs>0);
-    name = calloc((size_t)nmembs, sizeof(char *));
-    value = calloc((size_t)nmembs, MAX(H5Tget_size(type), dst_size));
+    name = calloc(nmembs, sizeof(char *));
+    value = calloc(nmembs, MAX(H5Tget_size(type), dst_size));
 
     for (i = 0; i < nmembs; i++) {
 	name[i] = H5Tget_member_name(type, i);
@@ -3624,8 +3628,11 @@ static void
 xml_print_datatype(hid_t type, unsigned in_group)
 {
     char                   *fname;
-    hid_t                   nmembers, mtype;
-    int                     i, j, ndims, perm[H5DUMP_MAX_RANK];
+    hid_t                   mtype;
+    unsigned                nmembers;
+    int                     perm[H5DUMP_MAX_RANK];
+    unsigned                ndims;
+    unsigned                i;
     size_t                  size;
     hsize_t                 dims[H5DUMP_MAX_RANK];
     H5T_str_t               str_pad;
@@ -3642,20 +3649,21 @@ xml_print_datatype(hid_t type, unsigned in_group)
     size_t                  msize;
     int                     nmembs;
     htri_t                  is_vlstr=FALSE;
+    herr_t                  ret;
 
     if (!in_group && H5Tcommitted(type) > 0) {
         /* detect a shared datatype, output only once */
         H5Gget_objinfo(type, ".", TRUE, &statbuf);
-        i = search_obj(type_table, statbuf.objno);
+        ret = search_obj(type_table, statbuf.objno);
 
-        if (i >= 0) {
+        if (ret >= 0) {
             /* This should be defined somewhere else */
             /* These 2 cases are handled the same right now, but
                probably will have something different eventually */
             int res;
             char * dtxid = malloc(100);
-            res = xml_name_to_XID(type_table->objs[i].objname,dtxid,100,1);
-            if (!type_table->objs[i].recorded) {
+            res = xml_name_to_XID(type_table->objs[ret].objname,dtxid,100,1);
+            if (!type_table->objs[ret].recorded) {
                 /* 'anonymous' NDT.  Use it's object num.
                    as it's name.  */
                 printf("<%sNamedDataTypePtr OBJ-XID=\"/%s\"/>\n",
@@ -3663,7 +3671,7 @@ xml_print_datatype(hid_t type, unsigned in_group)
                     dtxid);
             } else {
                 /* point to the NDT by name */
-                char *t_objname = xml_escape_the_name(type_table->objs[i].objname);
+                char *t_objname = xml_escape_the_name(type_table->objs[ret].objname);
                 printf("<%sNamedDataTypePtr OBJ-XID=\"%s\" H5Path=\"%s\"/>\n",
                     xmlnsprefix,
                     dtxid,t_objname);
@@ -3943,7 +3951,7 @@ xml_print_datatype(hid_t type, unsigned in_group)
             indentation(indent);
             printf("<%sArrayType Ndims=\"",xmlnsprefix);
             ndims = H5Tget_array_ndims(type);
-            printf("%d\">\n", ndims);
+            printf("%u\">\n", ndims);
 
             /* Get array information */
             H5Tget_array_dims(type, dims, perm);
@@ -3952,17 +3960,17 @@ xml_print_datatype(hid_t type, unsigned in_group)
             indent += COL;
             if (perm != NULL) {
                 /* for each dimension, list */
-                for (j = 0; j < ndims; j++) {
+                for (i = 0; i < ndims; i++) {
                     indentation(indent);
                     printf("<%sArrayDimension DimSize=\"%u\" DimPerm=\"%u\"/>\n",
-                           xmlnsprefix,(int) dims[j], (int) perm[j]);
+                           xmlnsprefix,(int) dims[i], (int) perm[i]);
                 }
             } else {
-                for (j = 0; j < ndims; j++) {
+                for (i = 0; i < ndims; i++) {
                     indentation(indent);
                     printf("<%sArrayDimension DimSize=\"%u\" DimPerm=\"0\"/>\n",
                            xmlnsprefix,
-                           (int) dims[j]);
+                           (int) dims[i]);
                 }
             }
             indent -= COL;
@@ -5073,7 +5081,7 @@ char * name;
 		case H5T_ENUM:
 			indentation(indent);
 			printf("<%sDataFromFile>\n",xmlnsprefix);
-			name = H5Tget_member_name(type, *(int *)buf);
+			name = H5Tget_member_name(type, *(unsigned *)buf);
 			indentation(indent);
 			printf("\"%s\"\n",name);
 			indentation(indent);
@@ -5412,11 +5420,11 @@ xml_print_enum(hid_t type)
 {
     char                  **name = NULL;	/*member names                    */
     unsigned char          *value = NULL;	/*value array                    */
-    int                     nmembs;	/*number of members                */
+    unsigned                nmembs;	/*number of members                */
     hid_t                   super;	/*enum base integer type        */
     hid_t                   native = -1;	/*native integer data type        */
     size_t                  dst_size;	/*destination value type size    */
-    int                     i;	/*miscellaneous counters        */
+    unsigned                i;	/*miscellaneous counters        */
     size_t                  j;
 
     nmembs = H5Tget_nmembers(type);
@@ -5448,8 +5456,8 @@ xml_print_enum(hid_t type)
     }
 
     /* Get the names and raw values of all members */
-    name = calloc((size_t)nmembs, sizeof(char *));
-    value = calloc((size_t)nmembs, MAX(H5Tget_size(type), dst_size));
+    name = calloc(nmembs, sizeof(char *));
+    value = calloc(nmembs, MAX(H5Tget_size(type), dst_size));
 
     for (i = 0; i < nmembs; i++) {
 	name[i] = H5Tget_member_name(type, i);
diff --git a/tools/h5ls/h5ls.c b/tools/h5ls/h5ls.c
index 0ee57ed..267e40f 100644
--- a/tools/h5ls/h5ls.c
+++ b/tools/h5ls/h5ls.c
@@ -703,11 +703,14 @@ display_cmpd_type(hid_t type, int ind)
     char        *name=NULL;     /* member name */
     size_t      size;           /* total size of type in bytes */
     hid_t       subtype;        /* member data type */
-    int         i, n;           /* miscellaneous counters */
+    unsigned    nmembs;         /* number of members */
+    int         n;              /* miscellaneous counters */
+    unsigned    i;              /* miscellaneous counters */
     
     if (H5T_COMPOUND!=H5Tget_class(type)) return FALSE;
     printf("struct {");
-    for (i=0; i<H5Tget_nmembers(type); i++) {
+    nmembs=H5Tget_nmembers(type);
+    for (i=0; i<nmembs; i++) {
 
         /* Name and offset */
         name = H5Tget_member_name(type, i);
@@ -750,16 +753,17 @@ display_enum_type(hid_t type, int ind)
 {
     char        **name=NULL;    /* member names */
     unsigned char *value=NULL;  /* value array */
-    int         nmembs;         /* number of members */
+    unsigned    nmembs;         /* number of members */
     int         nchars;         /* number of output characters */
     hid_t       super;          /* enum base integer type */
     hid_t       native=-1;      /* native integer data type */
     size_t      dst_size;       /* destination value type size */
-    int         i;              /* miscellaneous counters */
+    unsigned    i;              /* miscellaneous counters */
     size_t j;
         
     if (H5T_ENUM!=H5Tget_class(type)) return FALSE;
     nmembs = H5Tget_nmembers(type);
+    assert(nmembs>0);
     super = H5Tget_super(type);
     printf("enum ");
     display_type(super, ind+4);
@@ -771,23 +775,22 @@ display_enum_type(hid_t type, int ind)
      * 2. unsigned long_long -- the largest native unsigned integer
      *     3. raw format */
     if (H5Tget_size(type)<=sizeof(long_long)) {
- dst_size = sizeof(long_long);
- if (H5T_SGN_NONE==H5Tget_sign(type)) {
-     native = H5T_NATIVE_ULLONG;
- } else {
-     native = H5T_NATIVE_LLONG;
- }
+        dst_size = sizeof(long_long);
+        if (H5T_SGN_NONE==H5Tget_sign(type)) {
+            native = H5T_NATIVE_ULLONG;
+        } else {
+            native = H5T_NATIVE_LLONG;
+        }
     } else {
- dst_size = H5Tget_size(type);
+        dst_size = H5Tget_size(type);
     }
 
     /* Get the names and raw values of all members */
-    assert(nmembs>0);
-    name = calloc((size_t)nmembs, sizeof(char*));
-    value = calloc((size_t)nmembs, MAX(H5Tget_size(type), dst_size));
+    name = calloc(nmembs, sizeof(char*));
+    value = calloc(nmembs, MAX(H5Tget_size(type), dst_size));
     for (i=0; i<nmembs; i++) {
- name[i] = H5Tget_member_name(type, i);
- H5Tget_member_value(type, i, value+i*H5Tget_size(type));
+        name[i] = H5Tget_member_name(type, i);
+        H5Tget_member_value(type, i, value+i*H5Tget_size(type));
     }
 
     /* Convert values to native data type */
@@ -798,22 +801,21 @@ display_enum_type(hid_t type, int ind)
 
     /* Print members */
     for (i=0; i<nmembs; i++) {
- printf("\n%*s", ind+4, "");
- nchars = display_string(stdout, name[i], TRUE);
- printf("%*s = ", MAX(0, 16-nchars), "");
-
- if (native<0) {
-     printf("0x");
-     for (j=0; j<dst_size; j++) {
-  printf("%02x", value[i*dst_size+j]);
-     }
- } else if (H5T_SGN_NONE==H5Tget_sign(native)) {
-     HDfprintf(stdout,"%"H5_PRINTF_LL_WIDTH"u",
-     *((unsigned long_long*)((void*)(value+i*dst_size))));
- } else {
-     HDfprintf(stdout,"%"H5_PRINTF_LL_WIDTH"d",
-     *((long_long*)((void*)(value+i*dst_size))));
- }
+        printf("\n%*s", ind+4, "");
+        nchars = display_string(stdout, name[i], TRUE);
+        printf("%*s = ", MAX(0, 16-nchars), "");
+
+        if (native<0) {
+            printf("0x");
+            for (j=0; j<dst_size; j++)
+                printf("%02x", value[i*dst_size+j]);
+        } else if (H5T_SGN_NONE==H5Tget_sign(native)) {
+            HDfprintf(stdout,"%"H5_PRINTF_LL_WIDTH"u",
+            *((unsigned long_long*)((void*)(value+i*dst_size))));
+        } else {
+            HDfprintf(stdout,"%"H5_PRINTF_LL_WIDTH"d",
+            *((long_long*)((void*)(value+i*dst_size))));
+        }
     }
 
     /* Release resources */
diff --git a/tools/lib/h5tools_str.c b/tools/lib/h5tools_str.c
index ea65adc..de1bf72 100644
--- a/tools/lib/h5tools_str.c
+++ b/tools/lib/h5tools_str.c
@@ -515,7 +515,8 @@ h5tools_str_sprint(h5tools_str_t *str, const h5dump_t *info, hid_t container,
     unsigned char *ucp_vp = (unsigned char *)vp;
     char          *cp_vp = (char *)vp;
     hid_t          memb, obj, region;
-    int	           nmembs, otype;
+    unsigned       nmembs;
+    int	           otype;
     static char    fmt_llong[8], fmt_ullong[8];
     H5T_str_t      pad;
     H5G_stat_t     sb;
@@ -682,7 +683,7 @@ h5tools_str_sprint(h5tools_str_t *str, const h5dump_t *info, hid_t container,
             h5tools_str_append(str, OPT(info->fmt_ullong, fmt_ullong), tempullong);
         }
     } else if (H5Tget_class(type) == H5T_COMPOUND) {
-        int j;
+        unsigned j;
 
         nmembs = H5Tget_nmembers(type);
         h5tools_str_append(str, "%s", OPT(info->cmpd_pre, "{"));