libctf: Sanitize error types for PR 30836

Made sure there is no implicit conversion between signed and unsigned
return value for functions setting the ctf_errno value.
An example of the problem is that in ctf_member_next, the "offset" value
is either 0L or (ctf_id_t)-1L, but it should have been 0L or -1L.
The issue was discovered while building a 64 bit ld binary to be
executed on the Windows platform.
Example object file that demonstrates the issue is attached in the PR.

libctf/
	Affected functions adjusted.

Signed-off-by: Torbjörn SVENSSON <torbjorn.svensson@foss.st.com>
Co-Authored-By: Yvan ROUX <yvan.roux@foss.st.com>

8 files changed, 114 insertions, 134 deletions

diff --git a/libctf/ctf-create.c b/libctf/ctf-create.c
index 6b342dc..fff18e5 100644
--- a/libctf/ctf-create.c
+++ b/libctf/ctf-create.c
@@ -225,10 +225,7 @@ ctf_dtd_insert (ctf_dict_t *fp, ctf_dtdef_t *dtd, int flag, int kind)
   const char *name;
   if (ctf_dynhash_insert (fp->ctf_dthash, (void *) (uintptr_t) dtd->dtd_type,
 			  dtd) < 0)
-    {
-      ctf_set_errno (fp, ENOMEM);
-      return -1;
-    }
+    return ctf_set_errno (fp, ENOMEM);
 
   if (flag == CTF_ADD_ROOT && dtd->dtd_data.ctt_name
       && (name = ctf_strraw (fp, dtd->dtd_data.ctt_name)) != NULL)
@@ -239,8 +236,7 @@ ctf_dtd_insert (ctf_dict_t *fp, ctf_dtdef_t *dtd, int flag, int kind)
 	{
 	  ctf_dynhash_remove (fp->ctf_dthash, (void *) (uintptr_t)
 			      dtd->dtd_type);
-	  ctf_set_errno (fp, ENOMEM);
-	  return -1;
+	  return ctf_set_errno (fp, ENOMEM);
 	}
     }
   ctf_list_append (&fp->ctf_dtdefs, dtd);
@@ -329,10 +325,7 @@ int
 ctf_dvd_insert (ctf_dict_t *fp, ctf_dvdef_t *dvd)
 {
   if (ctf_dynhash_insert (fp->ctf_dvhash, dvd->dvd_name, dvd) < 0)
-    {
-      ctf_set_errno (fp, ENOMEM);
-      return -1;
-    }
+    return ctf_set_errno (fp, ENOMEM);
   ctf_list_append (&fp->ctf_dvdefs, dvd);
   return 0;
 }
@@ -453,23 +446,23 @@ ctf_add_generic (ctf_dict_t *fp, uint32_t flag, const char *name, int kind,
   ctf_id_t type;
 
   if (flag != CTF_ADD_NONROOT && flag != CTF_ADD_ROOT)
-    return (ctf_set_errno (fp, EINVAL));
+    return (ctf_set_typed_errno (fp, EINVAL));
 
   if (!(fp->ctf_flags & LCTF_RDWR))
-    return (ctf_set_errno (fp, ECTF_RDONLY));
+    return (ctf_set_typed_errno (fp, ECTF_RDONLY));
 
   if (LCTF_INDEX_TO_TYPE (fp, fp->ctf_typemax, 1) >= CTF_MAX_TYPE)
-    return (ctf_set_errno (fp, ECTF_FULL));
+    return (ctf_set_typed_errno (fp, ECTF_FULL));
 
   if (LCTF_INDEX_TO_TYPE (fp, fp->ctf_typemax, 1) == (CTF_MAX_PTYPE - 1))
-    return (ctf_set_errno (fp, ECTF_FULL));
+    return (ctf_set_typed_errno (fp, ECTF_FULL));
 
   /* Make sure ptrtab always grows to be big enough for all types.  */
   if (ctf_grow_ptrtab (fp) < 0)
       return CTF_ERR;				/* errno is set for us. */
 
   if ((dtd = calloc (1, sizeof (ctf_dtdef_t))) == NULL)
-    return (ctf_set_errno (fp, EAGAIN));
+    return (ctf_set_typed_errno (fp, EAGAIN));
 
   dtd->dtd_vlen_alloc = vlen;
   if (vlen > 0)
@@ -532,13 +525,13 @@ ctf_add_encoded (ctf_dict_t *fp, uint32_t flag,
   uint32_t encoding;
 
   if (ep == NULL)
-    return (ctf_set_errno (fp, EINVAL));
+    return (ctf_set_typed_errno (fp, EINVAL));
 
   if (name == NULL || name[0] == '\0')
-    return (ctf_set_errno (fp, ECTF_NONAME));
+    return (ctf_set_typed_errno (fp, ECTF_NONAME));
 
   if (!ctf_assert (fp, kind == CTF_K_INTEGER || kind == CTF_K_FLOAT))
-    return -1;					/* errno is set for us.  */
+    return CTF_ERR;					/* errno is set for us.  */
 
   if ((type = ctf_add_generic (fp, flag, name, kind, sizeof (uint32_t),
 			       &dtd)) == CTF_ERR)
@@ -570,7 +563,7 @@ ctf_add_reftype (ctf_dict_t *fp, uint32_t flag, ctf_id_t ref, uint32_t kind)
   int child = fp->ctf_flags & LCTF_CHILD;
 
   if (ref == CTF_ERR || ref > CTF_MAX_TYPE)
-    return (ctf_set_errno (fp, EINVAL));
+    return (ctf_set_typed_errno (fp, EINVAL));
 
   if (ref != 0 && ctf_lookup_by_id (&tmp, ref) == NULL)
     return CTF_ERR;		/* errno is set for us.  */
@@ -613,13 +606,13 @@ ctf_add_slice (ctf_dict_t *fp, uint32_t flag, ctf_id_t ref,
   ctf_dict_t *tmp = fp;
 
   if (ep == NULL)
-    return (ctf_set_errno (fp, EINVAL));
+    return (ctf_set_typed_errno (fp, EINVAL));
 
   if ((ep->cte_bits > 255) || (ep->cte_offset > 255))
-    return (ctf_set_errno (fp, ECTF_SLICEOVERFLOW));
+    return (ctf_set_typed_errno (fp, ECTF_SLICEOVERFLOW));
 
   if (ref == CTF_ERR || ref > CTF_MAX_TYPE)
-    return (ctf_set_errno (fp, EINVAL));
+    return (ctf_set_typed_errno (fp, EINVAL));
 
   if (ref != 0 && ((tp = ctf_lookup_by_id (&tmp, ref)) == NULL))
     return CTF_ERR;		/* errno is set for us.  */
@@ -634,7 +627,7 @@ ctf_add_slice (ctf_dict_t *fp, uint32_t flag, ctf_id_t ref,
   if ((kind != CTF_K_INTEGER) && (kind != CTF_K_FLOAT) &&
       (kind != CTF_K_ENUM)
       && (ref != 0))
-    return (ctf_set_errno (fp, ECTF_NOTINTFP));
+    return (ctf_set_typed_errno (fp, ECTF_NOTINTFP));
 
   if ((type = ctf_add_generic (fp, flag, NULL, CTF_K_SLICE,
 			       sizeof (ctf_slice_t), &dtd)) == CTF_ERR)
@@ -682,7 +675,7 @@ ctf_add_array (ctf_dict_t *fp, uint32_t flag, const ctf_arinfo_t *arp)
   ctf_dict_t *tmp = fp;
 
   if (arp == NULL)
-    return (ctf_set_errno (fp, EINVAL));
+    return (ctf_set_typed_errno (fp, EINVAL));
 
   if (arp->ctr_contents != 0
       && ctf_lookup_by_id (&tmp, arp->ctr_contents) == NULL)
@@ -697,7 +690,7 @@ ctf_add_array (ctf_dict_t *fp, uint32_t flag, const ctf_arinfo_t *arp)
       ctf_err_warn (fp, 1, ECTF_INCOMPLETE,
 		    _("ctf_add_array: index type %lx is incomplete"),
 		    arp->ctr_contents);
-      return (ctf_set_errno (fp, ECTF_INCOMPLETE));
+      return (ctf_set_typed_errno (fp, ECTF_INCOMPLETE));
     }
 
   if ((type = ctf_add_generic (fp, flag, NULL, CTF_K_ARRAY,
@@ -751,11 +744,11 @@ ctf_add_function (ctf_dict_t *fp, uint32_t flag,
   size_t i;
 
   if (!(fp->ctf_flags & LCTF_RDWR))
-    return (ctf_set_errno (fp, ECTF_RDONLY));
+    return (ctf_set_typed_errno (fp, ECTF_RDONLY));
 
   if (ctc == NULL || (ctc->ctc_flags & ~CTF_FUNC_VARARG) != 0
       || (ctc->ctc_argc != 0 && argv == NULL))
-    return (ctf_set_errno (fp, EINVAL));
+    return (ctf_set_typed_errno (fp, EINVAL));
 
   vlen = ctc->ctc_argc;
   if (ctc->ctc_flags & CTF_FUNC_VARARG)
@@ -766,7 +759,7 @@ ctf_add_function (ctf_dict_t *fp, uint32_t flag,
     return CTF_ERR;				/* errno is set for us.  */
 
   if (vlen > CTF_MAX_VLEN)
-    return (ctf_set_errno (fp, EOVERFLOW));
+    return (ctf_set_typed_errno (fp, EOVERFLOW));
 
   /* One word extra allocated for padding for 4-byte alignment if need be.
      Not reflected in vlen: we don't want to copy anything into it, and
@@ -818,7 +811,7 @@ ctf_add_struct_sized (ctf_dict_t *fp, uint32_t flag, const char *name,
   if (dtd->dtd_vlen_alloc == 0)
     {
       if ((dtd->dtd_vlen = calloc (1, initial_vlen)) == NULL)
-	return (ctf_set_errno (fp, ENOMEM));
+	return (ctf_set_typed_errno (fp, ENOMEM));
       dtd->dtd_vlen_alloc = initial_vlen;
     }
 
@@ -858,7 +851,7 @@ ctf_add_union_sized (ctf_dict_t *fp, uint32_t flag, const char *name,
   if (dtd->dtd_vlen_alloc == 0)
     {
       if ((dtd->dtd_vlen = calloc (1, initial_vlen)) == NULL)
-	return (ctf_set_errno (fp, ENOMEM));
+	return (ctf_set_typed_errno (fp, ENOMEM));
       dtd->dtd_vlen_alloc = initial_vlen;
     }
 
@@ -897,7 +890,7 @@ ctf_add_enum (ctf_dict_t *fp, uint32_t flag, const char *name)
   if (dtd->dtd_vlen_alloc == 0)
     {
       if ((dtd->dtd_vlen = calloc (1, initial_vlen)) == NULL)
-	return (ctf_set_errno (fp, ENOMEM));
+	return (ctf_set_typed_errno (fp, ENOMEM));
       dtd->dtd_vlen_alloc = initial_vlen;
     }
 
@@ -925,7 +918,7 @@ ctf_add_enum_encoded (ctf_dict_t *fp, uint32_t flag, const char *name,
     {
       if ((ctf_type_kind (fp, type) != CTF_K_FORWARD) &&
 	  (ctf_type_kind_unsliced (fp, type) != CTF_K_ENUM))
-	return (ctf_set_errno (fp, ECTF_NOTINTFP));
+	return (ctf_set_typed_errno (fp, ECTF_NOTINTFP));
     }
   else if ((type = ctf_add_enum (fp, flag, name)) == CTF_ERR)
     return CTF_ERR;		/* errno is set for us.  */
@@ -943,10 +936,10 @@ ctf_add_forward (ctf_dict_t *fp, uint32_t flag, const char *name,
   ctf_id_t type = 0;
 
   if (!ctf_forwardable_kind (kind))
-    return (ctf_set_errno (fp, ECTF_NOTSUE));
+    return (ctf_set_typed_errno (fp, ECTF_NOTSUE));
 
   if (name == NULL || name[0] == '\0')
-    return (ctf_set_errno (fp, ECTF_NONAME));
+    return (ctf_set_typed_errno (fp, ECTF_NONAME));
 
   /* If the type is already defined or exists as a forward tag, just
      return the ctf_id_t of the existing definition.  */
@@ -985,7 +978,7 @@ ctf_add_unknown (ctf_dict_t *fp, uint32_t flag, const char *name)
 			_("ctf_add_unknown: cannot add unknown type "
 			  "named %s: type of this name already defined"),
 			name ? name : _("(unnamed type)"));
-	  return (ctf_set_errno (fp, ECTF_CONFLICT));
+	  return (ctf_set_typed_errno (fp, ECTF_CONFLICT));
 	}
     }
 
@@ -1007,10 +1000,10 @@ ctf_add_typedef (ctf_dict_t *fp, uint32_t flag, const char *name,
   ctf_dict_t *tmp = fp;
 
   if (ref == CTF_ERR || ref > CTF_MAX_TYPE)
-    return (ctf_set_errno (fp, EINVAL));
+    return (ctf_set_typed_errno (fp, EINVAL));
 
   if (name == NULL || name[0] == '\0')
-    return (ctf_set_errno (fp, ECTF_NONAME));
+    return (ctf_set_typed_errno (fp, ECTF_NONAME));
 
   if (ref != 0 && ctf_lookup_by_id (&tmp, ref) == NULL)
     return CTF_ERR;		/* errno is set for us.  */
@@ -1575,14 +1568,14 @@ ctf_add_type_internal (ctf_dict_t *dst_fp, ctf_dict_t *src_fp, ctf_id_t src_type
   ctf_id_t orig_src_type = src_type;
 
   if (!(dst_fp->ctf_flags & LCTF_RDWR))
-    return (ctf_set_errno (dst_fp, ECTF_RDONLY));
+    return (ctf_set_typed_errno (dst_fp, ECTF_RDONLY));
 
   if ((src_tp = ctf_lookup_by_id (&src_fp, src_type)) == NULL)
-    return (ctf_set_errno (dst_fp, ctf_errno (src_fp)));
+    return (ctf_set_typed_errno (dst_fp, ctf_errno (src_fp)));
 
   if ((ctf_type_resolve (src_fp, src_type) == CTF_ERR)
       && (ctf_errno (src_fp) == ECTF_NONREPRESENTABLE))
-    return (ctf_set_errno (dst_fp, ECTF_NONREPRESENTABLE));
+    return (ctf_set_typed_errno (dst_fp, ECTF_NONREPRESENTABLE));
 
   name = ctf_strptr (src_fp, src_tp->ctt_name);
   kind = LCTF_INFO_KIND (src_fp, src_tp->ctt_info);
@@ -1661,7 +1654,7 @@ ctf_add_type_internal (ctf_dict_t *dst_fp, ctf_dict_t *src_fp, ctf_id_t src_type
 			_("ctf_add_type: conflict for type %s: "
 			  "kinds differ, new: %i; old (ID %lx): %i"),
 			name, kind, dst_type, dst_kind);
-	  return (ctf_set_errno (dst_fp, ECTF_CONFLICT));
+	  return (ctf_set_typed_errno (dst_fp, ECTF_CONFLICT));
 	}
     }
 
@@ -1672,7 +1665,7 @@ ctf_add_type_internal (ctf_dict_t *dst_fp, ctf_dict_t *src_fp, ctf_id_t src_type
   if (kind == CTF_K_INTEGER || kind == CTF_K_FLOAT || kind == CTF_K_SLICE)
     {
       if (ctf_type_encoding (src_fp, src_type, &src_en) != 0)
-	return (ctf_set_errno (dst_fp, ctf_errno (src_fp)));
+	return (ctf_set_typed_errno (dst_fp, ctf_errno (src_fp)));
 
       if (dst_type != CTF_ERR)
 	{
@@ -1702,7 +1695,7 @@ ctf_add_type_internal (ctf_dict_t *dst_fp, ctf_dict_t *src_fp, ctf_id_t src_type
 		}
 	      else
 		  {
-		    return (ctf_set_errno (dst_fp, ECTF_CONFLICT));
+		    return (ctf_set_typed_errno (dst_fp, ECTF_CONFLICT));
 		  }
 	    }
 	  else
@@ -1740,7 +1733,7 @@ ctf_add_type_internal (ctf_dict_t *dst_fp, ctf_dict_t *src_fp, ctf_id_t src_type
 
   if (ctf_dynhash_insert (proc_tracking_fp->ctf_add_processing,
 			  (void *) (uintptr_t) src_type, (void *) 1) < 0)
-    return ctf_set_errno (dst_fp, ENOMEM);
+    return ctf_set_typed_errno (dst_fp, ENOMEM);
 
   switch (kind)
     {
@@ -1785,7 +1778,7 @@ ctf_add_type_internal (ctf_dict_t *dst_fp, ctf_dict_t *src_fp, ctf_id_t src_type
 
     case CTF_K_ARRAY:
       if (ctf_array_info (src_fp, src_type, &src_ar) != 0)
-	return (ctf_set_errno (dst_fp, ctf_errno (src_fp)));
+	return (ctf_set_typed_errno (dst_fp, ctf_errno (src_fp)));
 
       src_ar.ctr_contents =
 	ctf_add_type_internal (dst_fp, src_fp, src_ar.ctr_contents,
@@ -1812,7 +1805,7 @@ ctf_add_type_internal (ctf_dict_t *dst_fp, ctf_dict_t *src_fp, ctf_id_t src_type
 			    src_ar.ctr_index, src_ar.ctr_nelems,
 			    dst_ar.ctr_contents, dst_ar.ctr_index,
 			    dst_ar.ctr_nelems);
-	      return (ctf_set_errno (dst_fp, ECTF_CONFLICT));
+	      return (ctf_set_typed_errno (dst_fp, ECTF_CONFLICT));
 	    }
 	}
       else
@@ -1859,7 +1852,7 @@ ctf_add_type_internal (ctf_dict_t *dst_fp, ctf_dict_t *src_fp, ctf_id_t src_type
 				"size differs, old %li, new %li"), name,
 			      dst_type, (long) ctf_type_size (src_fp, src_type),
 			      (long) ctf_type_size (dst_fp, dst_type));
-		return (ctf_set_errno (dst_fp, ECTF_CONFLICT));
+		return (ctf_set_typed_errno (dst_fp, ECTF_CONFLICT));
 	      }
 
 	    if (ctf_member_iter (src_fp, src_type, membcmp, &dst))
@@ -1867,7 +1860,7 @@ ctf_add_type_internal (ctf_dict_t *dst_fp, ctf_dict_t *src_fp, ctf_id_t src_type
 		ctf_err_warn (dst_fp, 1, ECTF_CONFLICT,
 			      _("conflict for type %s against ID %lx: members "
 				"differ, see above"), name, dst_type);
-		return (ctf_set_errno (dst_fp, ECTF_CONFLICT));
+		return (ctf_set_typed_errno (dst_fp, ECTF_CONFLICT));
 	      }
 
 	    break;
@@ -1925,7 +1918,7 @@ ctf_add_type_internal (ctf_dict_t *dst_fp, ctf_dict_t *src_fp, ctf_id_t src_type
 	      ctf_err_warn (dst_fp, 1, ECTF_CONFLICT,
 			    _("conflict for enum %s against ID %lx: members "
 			      "differ, see above"), name, dst_type);
-	      return (ctf_set_errno (dst_fp, ECTF_CONFLICT));
+	      return (ctf_set_typed_errno (dst_fp, ECTF_CONFLICT));
 	    }
 	}
       else
@@ -1964,7 +1957,7 @@ ctf_add_type_internal (ctf_dict_t *dst_fp, ctf_dict_t *src_fp, ctf_id_t src_type
       break;
 
     default:
-      return (ctf_set_errno (dst_fp, ECTF_CORRUPT));
+      return (ctf_set_typed_errno (dst_fp, ECTF_CORRUPT));
     }
 
   if (dst_type != CTF_ERR)
@@ -1985,7 +1978,7 @@ ctf_add_type (ctf_dict_t *dst_fp, ctf_dict_t *src_fp, ctf_id_t src_type)
   /* We store the hash on the source, because it contains only source type IDs:
      but callers will invariably expect errors to appear on the dest.  */
   if (!src_fp->ctf_add_processing)
-    return (ctf_set_errno (dst_fp, ENOMEM));
+    return (ctf_set_typed_errno (dst_fp, ENOMEM));
 
   id = ctf_add_type_internal (dst_fp, src_fp, src_type, src_fp);
   ctf_dynhash_empty (src_fp->ctf_add_processing);
diff --git a/libctf/ctf-dedup.c b/libctf/ctf-dedup.c
index 5fdddfd..43f44f1 100644
--- a/libctf/ctf-dedup.c
+++ b/libctf/ctf-dedup.c
@@ -1318,8 +1318,7 @@ ctf_dedup_mark_conflicting_hash (ctf_dict_t *fp, const char *hval)
   if (ctf_dynset_cinsert (d->cd_conflicting_types, hval) < 0)
     {
       ctf_dprintf ("Out of memory marking %s as conflicted\n", hval);
-      ctf_set_errno (fp, errno);
-      return -1;
+      return ctf_set_errno (fp, errno);
     }
 
   /* If any types cite this type, mark them conflicted too.  */
@@ -2451,18 +2450,12 @@ ctf_dedup_maybe_synthesize_forward (ctf_dict_t *output, ctf_dict_t *target,
     {
       if ((emitted_forward = ctf_add_forward (target, CTF_ADD_ROOT, name,
 					      fwdkind)) == CTF_ERR)
-	{
-	  ctf_set_errno (output, ctf_errno (target));
-	  return CTF_ERR;
-	}
+	return ctf_set_typed_errno (output, ctf_errno (target));
 
       if (ctf_dynhash_cinsert (td->cd_output_emission_conflicted_forwards,
 			       decorated, (void *) (uintptr_t)
 			       emitted_forward) < 0)
-	{
-	  ctf_set_errno (output, ENOMEM);
-	  return CTF_ERR;
-	}
+	return ctf_set_typed_errno (output, ENOMEM);
     }
   else
     emitted_forward = (ctf_id_t) (uintptr_t) v;
@@ -2525,7 +2518,7 @@ ctf_dedup_id_to_target (ctf_dict_t *output, ctf_dict_t *target,
   if ((input->ctf_flags & LCTF_CHILD) && (LCTF_TYPE_ISPARENT (input, id)))
     {
       if (!ctf_assert (output, parents[input_num] <= ninputs))
-	return -1;
+	return CTF_ERR;
       input = inputs[parents[input_num]];
       input_num = parents[input_num];
     }
@@ -2534,7 +2527,7 @@ ctf_dedup_id_to_target (ctf_dict_t *output, ctf_dict_t *target,
 			     CTF_DEDUP_GID (output, input_num, id));
 
   if (!ctf_assert (output, hval && td->cd_output_emission_hashes))
-    return -1;
+    return CTF_ERR;
 
   /* If this type is a conflicted tagged structure, union, or forward,
      substitute a synthetic forward instead, emitting it if need be.  Only do
@@ -2553,7 +2546,7 @@ ctf_dedup_id_to_target (ctf_dict_t *output, ctf_dict_t *target,
       ctf_set_errno (err_fp, ctf_errno (output));
       ctf_err_warn (err_fp, 0, 0, _("cannot add synthetic forward for type "
 				    "%i/%lx"), input_num, id);
-      return -1;
+      return CTF_ERR;
     default:
       return emitted_forward;
     }
@@ -2568,7 +2561,7 @@ ctf_dedup_id_to_target (ctf_dict_t *output, ctf_dict_t *target,
       ctf_dprintf ("Checking shared parent for target\n");
       if (!ctf_assert (output, (target != output)
 		       && (target->ctf_flags & LCTF_CHILD)))
-	return -1;
+	return CTF_ERR;
 
       target_id = ctf_dynhash_lookup (od->cd_output_emission_hashes, hval);
 
@@ -2582,13 +2575,13 @@ ctf_dedup_id_to_target (ctf_dict_t *output, ctf_dict_t *target,
 	  ctf_err_warn (err_fp, 0, ctf_errno (output),
 			_("cannot add synthetic forward for type %i/%lx"),
 			input_num, id);
-	  return ctf_set_errno (err_fp, ctf_errno (output));
+	  return ctf_set_typed_errno (err_fp, ctf_errno (output));
 	default:
 	  return emitted_forward;
 	}
     }
   if (!ctf_assert (output, target_id))
-    return -1;
+    return CTF_ERR;
   return (ctf_id_t) (uintptr_t) target_id;
 }
 
diff --git a/libctf/ctf-impl.h b/libctf/ctf-impl.h
index da68776..77d74ef 100644
--- a/libctf/ctf-impl.h
+++ b/libctf/ctf-impl.h
@@ -741,7 +741,6 @@ extern struct ctf_archive *ctf_arc_open_internal (const char *, int *);
 extern void ctf_arc_close_internal (struct ctf_archive *);
 extern const ctf_preamble_t *ctf_arc_bufpreamble (const ctf_sect_t *);
 extern void *ctf_set_open_errno (int *, int);
-extern unsigned long ctf_set_errno (ctf_dict_t *, int);
 extern void ctf_flip_header (ctf_header_t *);
 extern int ctf_flip (ctf_dict_t *, ctf_header_t *, unsigned char *, int);
 
diff --git a/libctf/ctf-inlines.h b/libctf/ctf-inlines.h
index 6bda68d..84044a1 100644
--- a/libctf/ctf-inlines.h
+++ b/libctf/ctf-inlines.h
@@ -90,6 +90,23 @@ ctf_assert_internal (ctf_dict_t *fp, const char *file, size_t line,
   return expr;
 }
 
+static inline int
+ctf_set_errno (ctf_dict_t *fp, int err)
+{
+  fp->ctf_errno = err;
+  /* Don't rely on CTF_ERR here as it will not properly sign extend on 64-bit
+     Windows ABI.  */
+  return -1;
+}
+
+static inline ctf_id_t
+ctf_set_typed_errno (ctf_dict_t *fp, int err)
+{
+  fp->ctf_errno = err;
+  return CTF_ERR;
+}
+
+
 #ifdef	__cplusplus
 }
 #endif
diff --git a/libctf/ctf-link.c b/libctf/ctf-link.c
index 9babec2..27d11c9 100644
--- a/libctf/ctf-link.c
+++ b/libctf/ctf-link.c
@@ -243,8 +243,7 @@ ctf_link_lazy_open (ctf_dict_t *fp, ctf_link_input_t *input)
 #else
   ctf_err_warn (fp, 0, ECTF_NEEDSBFD, _("cannot open %s lazily"),
 		input->clin_filename);
-  ctf_set_errno (fp, ECTF_NEEDSBFD);
-  return -1;
+  return ctf_set_errno (fp, ECTF_NEEDSBFD);
 #endif
 
   /* Having no CTF sections is not an error.  We just don't need to do
@@ -257,8 +256,7 @@ ctf_link_lazy_open (ctf_dict_t *fp, ctf_link_input_t *input)
 
       ctf_err_warn (fp, 0, err, _("opening CTF %s failed"),
 		    input->clin_filename);
-      ctf_set_errno (fp, err);
-      return -1;
+      return ctf_set_errno (fp, err);
     }
 
   if ((count = ctf_archive_count (input->clin_arc)) == 0)
@@ -680,8 +678,7 @@ ctf_link_deduplicating_count_inputs (ctf_dict_t *fp, ctf_dynhash_t *cu_names,
     {
       ctf_err_warn (fp, 0, err, _("iteration error counting deduplicating "
 				  "CTF link inputs"));
-      ctf_set_errno (fp, err);
-      return -1;
+      return ctf_set_errno (fp, err);
     }
 
   if (!count)
@@ -1355,8 +1352,7 @@ ctf_link_empty_outputs (ctf_dict_t *fp)
     {
       fp->ctf_flags &= ~LCTF_LINKING;
       ctf_err_warn (fp, 1, err, _("iteration error removing old outputs"));
-      ctf_set_errno (fp, err);
-      return -1;
+      return ctf_set_errno (fp, err);
     }
   return 0;
 }
@@ -1536,8 +1532,7 @@ ctf_link (ctf_dict_t *fp, int flags)
 	{
 	  fp->ctf_flags &= ~LCTF_LINKING;
 	  ctf_err_warn (fp, 1, err, _("iteration error creating empty CUs"));
-	  ctf_set_errno (fp, err);
-	  return -1;
+	  return ctf_set_errno (fp, err);
 	}
     }
 
diff --git a/libctf/ctf-lookup.c b/libctf/ctf-lookup.c
index c658491..177cb1b 100644
--- a/libctf/ctf-lookup.c
+++ b/libctf/ctf-lookup.c
@@ -143,7 +143,7 @@ ctf_lookup_by_name_internal (ctf_dict_t *fp, ctf_dict_t *child,
   ctf_id_t ntype, ptype;
 
   if (name == NULL)
-    return (ctf_set_errno (fp, EINVAL));
+    return (ctf_set_typed_errno (fp, EINVAL));
 
   for (p = name, end = name + strlen (name); *p != '\0'; p = q)
     {
@@ -273,10 +273,7 @@ ctf_lookup_by_name_internal (ctf_dict_t *fp, ctf_dict_t *child,
 		  free (fp->ctf_tmp_typeslice);
 		  fp->ctf_tmp_typeslice = xstrndup (p, (size_t) (q - p));
 		  if (fp->ctf_tmp_typeslice == NULL)
-		    {
-		      ctf_set_errno (fp, ENOMEM);
-		      return CTF_ERR;
-		    }
+		    return ctf_set_typed_errno (fp, ENOMEM);
 		}
 
 	      if ((type = ctf_lookup_by_rawhash (fp, lp->ctl_hash,
@@ -292,7 +289,7 @@ ctf_lookup_by_name_internal (ctf_dict_t *fp, ctf_dict_t *child,
     }
 
   if (*p != '\0' || type == 0)
-    return (ctf_set_errno (fp, ECTF_SYNTAX));
+    return (ctf_set_typed_errno (fp, ECTF_SYNTAX));
 
   return type;
 
@@ -306,13 +303,13 @@ ctf_lookup_by_name_internal (ctf_dict_t *fp, ctf_dict_t *child,
       if (fp->ctf_pptrtab_typemax < fp->ctf_typemax)
 	{
 	  if (refresh_pptrtab (fp, fp->ctf_parent) < 0)
-	    return -1;			/* errno is set for us.  */
+	    return CTF_ERR;			/* errno is set for us.  */
 	}
 
       if ((ptype = ctf_lookup_by_name_internal (fp->ctf_parent, fp,
 						name)) != CTF_ERR)
 	return ptype;
-      return (ctf_set_errno (fp, ctf_errno (fp->ctf_parent)));
+      return (ctf_set_typed_errno (fp, ctf_errno (fp->ctf_parent)));
     }
 
   return CTF_ERR;
@@ -407,10 +404,10 @@ ctf_lookup_variable (ctf_dict_t *fp, const char *name)
 
           if ((ptype = ctf_lookup_variable (fp->ctf_parent, name)) != CTF_ERR)
             return ptype;
-          return (ctf_set_errno (fp, ctf_errno (fp->ctf_parent)));
+          return (ctf_set_typed_errno (fp, ctf_errno (fp->ctf_parent)));
         }
 
-      return (ctf_set_errno (fp, ECTF_NOTYPEDAT));
+      return (ctf_set_typed_errno (fp, ECTF_NOTYPEDAT));
     }
 
   return ent->ctv_type;
@@ -673,7 +670,7 @@ ctf_symbol_next (ctf_dict_t *fp, ctf_next_t **it, const char **name,
   if (!i)
     {
       if ((i = ctf_next_create ()) == NULL)
-	return ctf_set_errno (fp, ENOMEM);
+	return ctf_set_typed_errno (fp, ENOMEM);
 
       i->cu.ctn_fp = fp;
       i->ctn_iter_fun = (void (*) (void)) ctf_symbol_next;
@@ -682,10 +679,10 @@ ctf_symbol_next (ctf_dict_t *fp, ctf_next_t **it, const char **name,
     }
 
   if ((void (*) (void)) ctf_symbol_next != i->ctn_iter_fun)
-    return (ctf_set_errno (fp, ECTF_NEXT_WRONGFUN));
+    return (ctf_set_typed_errno (fp, ECTF_NEXT_WRONGFUN));
 
   if (fp != i->cu.ctn_fp)
-    return (ctf_set_errno (fp, ECTF_NEXT_WRONGFP));
+    return (ctf_set_typed_errno (fp, ECTF_NEXT_WRONGFP));
 
   /* We intentionally use raw access, not ctf_lookup_by_symbol, to avoid
      incurring additional sorting cost for unsorted symtypetabs coming from the
@@ -701,7 +698,7 @@ ctf_symbol_next (ctf_dict_t *fp, ctf_next_t **it, const char **name,
       if (!dynh)
 	{
 	  ctf_next_destroy (i);
-	  return (ctf_set_errno (fp, ECTF_NEXT_END));
+	  return (ctf_set_typed_errno (fp, ECTF_NEXT_END));
 	}
 
       err = ctf_dynhash_next (dynh, &i->ctn_next, &dyn_name, &dyn_value);
@@ -710,7 +707,7 @@ ctf_symbol_next (ctf_dict_t *fp, ctf_next_t **it, const char **name,
 	{
 	  ctf_next_destroy (i);
 	  *it = NULL;
-	  return ctf_set_errno (fp, err);
+	  return ctf_set_typed_errno (fp, err);
 	}
 
       *name = dyn_name;
@@ -786,7 +783,7 @@ ctf_symbol_next (ctf_dict_t *fp, ctf_next_t **it, const char **name,
  end:
   ctf_next_destroy (i);
   *it = NULL;
-  return (ctf_set_errno (fp, ECTF_NEXT_END));
+  return (ctf_set_typed_errno (fp, ECTF_NEXT_END));
 }
 
 /* A bsearch function for function and object index names.  */
@@ -821,7 +818,7 @@ ctf_try_lookup_indexed (ctf_dict_t *fp, unsigned long symidx,
 	       "indexed symtypetab\n", symidx, symname);
 
   if (symname[0] == '\0')
-    return -1;					/* errno is set for us.  */
+    return CTF_ERR;					/* errno is set for us.  */
 
   if (is_function)
     {
@@ -835,7 +832,7 @@ ctf_try_lookup_indexed (ctf_dict_t *fp, unsigned long symidx,
 	      == NULL)
 	    {
 	      ctf_err_warn (fp, 0, 0, _("cannot sort function symidx"));
-	      return -1;				/* errno is set for us.  */
+	      return CTF_ERR;				/* errno is set for us.  */
 	    }
 	}
       symtypetab = (uint32_t *) (fp->ctf_buf + hp->cth_funcoff);
@@ -855,7 +852,7 @@ ctf_try_lookup_indexed (ctf_dict_t *fp, unsigned long symidx,
 	      == NULL)
 	    {
 	      ctf_err_warn (fp, 0, 0, _("cannot sort object symidx"));
-	      return -1;				/* errno is set for us. */
+	      return CTF_ERR;				/* errno is set for us. */
 	    }
 	}
 
@@ -878,7 +875,7 @@ ctf_try_lookup_indexed (ctf_dict_t *fp, unsigned long symidx,
 
   /* Should be impossible, but be paranoid.  */
   if ((idx - sxlate) > (ptrdiff_t) nidx)
-    return (ctf_set_errno (fp, ECTF_CORRUPT));
+    return (ctf_set_typed_errno (fp, ECTF_CORRUPT));
 
   ctf_dprintf ("Symbol %lx (%s) is of type %x\n", symidx, symname,
 	       symtypetab[*idx]);
@@ -1014,7 +1011,7 @@ ctf_lookup_by_sym_or_name (ctf_dict_t *fp, unsigned long symidx,
       return ret;
     }
   else
-    return (ctf_set_errno (fp, err));
+    return (ctf_set_typed_errno (fp, err));
 }
 
 /* Given a symbol table index, return the type of the function or data object
diff --git a/libctf/ctf-types.c b/libctf/ctf-types.c
index c20ff82..694d6ea 100644
--- a/libctf/ctf-types.c
+++ b/libctf/ctf-types.c
@@ -426,7 +426,7 @@ ctf_type_next (ctf_dict_t *fp, ctf_next_t **it, int *flag, int want_hidden)
   if (!i)
     {
       if ((i = ctf_next_create ()) == NULL)
-	return ctf_set_errno (fp, ENOMEM);
+	return ctf_set_typed_errno (fp, ENOMEM);
 
       i->cu.ctn_fp = fp;
       i->ctn_type = 1;
@@ -435,10 +435,10 @@ ctf_type_next (ctf_dict_t *fp, ctf_next_t **it, int *flag, int want_hidden)
     }
 
   if ((void (*) (void)) ctf_type_next != i->ctn_iter_fun)
-    return (ctf_set_errno (fp, ECTF_NEXT_WRONGFUN));
+    return (ctf_set_typed_errno (fp, ECTF_NEXT_WRONGFUN));
 
   if (fp != i->cu.ctn_fp)
-    return (ctf_set_errno (fp, ECTF_NEXT_WRONGFP));
+    return (ctf_set_typed_errno (fp, ECTF_NEXT_WRONGFP));
 
   while (i->ctn_type <= fp->ctf_typemax)
     {
@@ -456,7 +456,7 @@ ctf_type_next (ctf_dict_t *fp, ctf_next_t **it, int *flag, int want_hidden)
     }
   ctf_next_destroy (i);
   *it = NULL;
-  return ctf_set_errno (fp, ECTF_NEXT_END);
+  return ctf_set_typed_errno (fp, ECTF_NEXT_END);
 }
 
 /* Iterate over every variable in the given CTF dict, in arbitrary order.
@@ -494,12 +494,12 @@ ctf_variable_next (ctf_dict_t *fp, ctf_next_t **it, const char **name)
   ctf_next_t *i = *it;
 
   if ((fp->ctf_flags & LCTF_CHILD) && (fp->ctf_parent == NULL))
-    return (ctf_set_errno (fp, ECTF_NOPARENT));
+    return (ctf_set_typed_errno (fp, ECTF_NOPARENT));
 
   if (!i)
     {
       if ((i = ctf_next_create ()) == NULL)
-	return ctf_set_errno (fp, ENOMEM);
+	return ctf_set_typed_errno (fp, ENOMEM);
 
       i->cu.ctn_fp = fp;
       i->ctn_iter_fun = (void (*) (void)) ctf_variable_next;
@@ -509,10 +509,10 @@ ctf_variable_next (ctf_dict_t *fp, ctf_next_t **it, const char **name)
     }
 
   if ((void (*) (void)) ctf_variable_next != i->ctn_iter_fun)
-    return (ctf_set_errno (fp, ECTF_NEXT_WRONGFUN));
+    return (ctf_set_typed_errno (fp, ECTF_NEXT_WRONGFUN));
 
   if (fp != i->cu.ctn_fp)
-    return (ctf_set_errno (fp, ECTF_NEXT_WRONGFP));
+    return (ctf_set_typed_errno (fp, ECTF_NEXT_WRONGFP));
 
   if (!(fp->ctf_flags & LCTF_RDWR))
     {
@@ -538,7 +538,7 @@ ctf_variable_next (ctf_dict_t *fp, ctf_next_t **it, const char **name)
  end_iter:
   ctf_next_destroy (i);
   *it = NULL;
-  return ctf_set_errno (fp, ECTF_NEXT_END);
+  return ctf_set_typed_errno (fp, ECTF_NEXT_END);
 }
 
 /* Follow a given type through the graph for TYPEDEF, VOLATILE, CONST, and
@@ -560,7 +560,7 @@ ctf_type_resolve (ctf_dict_t *fp, ctf_id_t type)
   const ctf_type_t *tp;
 
   if (type == 0)
-    return (ctf_set_errno (ofp, ECTF_NONREPRESENTABLE));
+    return (ctf_set_typed_errno (ofp, ECTF_NONREPRESENTABLE));
 
   while ((tp = ctf_lookup_by_id (&fp, type)) != NULL)
     {
@@ -575,18 +575,18 @@ ctf_type_resolve (ctf_dict_t *fp, ctf_id_t type)
 	    {
 	      ctf_err_warn (ofp, 0, ECTF_CORRUPT, _("type %lx cycle detected"),
 			    otype);
-	      return (ctf_set_errno (ofp, ECTF_CORRUPT));
+	      return (ctf_set_typed_errno (ofp, ECTF_CORRUPT));
 	    }
 	  prev = type;
 	  type = tp->ctt_type;
 	  break;
 	case CTF_K_UNKNOWN:
-	  return (ctf_set_errno (ofp, ECTF_NONREPRESENTABLE));
+	  return (ctf_set_typed_errno (ofp, ECTF_NONREPRESENTABLE));
 	default:
 	  return type;
 	}
       if (type == 0)
-	return (ctf_set_errno (ofp, ECTF_NONREPRESENTABLE));
+	return (ctf_set_typed_errno (ofp, ECTF_NONREPRESENTABLE));
     }
 
   return CTF_ERR;		/* errno is set for us.  */
@@ -612,7 +612,7 @@ ctf_type_resolve_unsliced (ctf_dict_t *fp, ctf_id_t type)
       ctf_id_t ret;
 
       if ((ret = ctf_type_reference (fp, type)) == CTF_ERR)
-	return (ctf_set_errno (ofp, ctf_errno (fp)));
+	return (ctf_set_typed_errno (ofp, ctf_errno (fp)));
       return ret;
     }
   return type;
@@ -854,7 +854,7 @@ ctf_type_lname (ctf_dict_t *fp, ctf_id_t type, char *buf, size_t len)
   size_t slen;
 
   if (str == NULL)
-    return CTF_ERR;			/* errno is set for us.  */
+    return -1;			/* errno is set for us.  */
 
   slen = strlen (str);
   snprintf (buf, len, "%s", str);
@@ -1139,7 +1139,7 @@ ctf_type_reference (ctf_dict_t *fp, ctf_id_t type)
 	return sp->cts_type;
       }
     default:
-      return (ctf_set_errno (ofp, ECTF_NOTREF));
+      return (ctf_set_typed_errno (ofp, ECTF_NOTREF));
     }
 }
 
@@ -1164,15 +1164,15 @@ ctf_type_pointer (ctf_dict_t *fp, ctf_id_t type)
     return (LCTF_INDEX_TO_TYPE (fp, ntype, (fp->ctf_flags & LCTF_CHILD)));
 
   if ((type = ctf_type_resolve (fp, type)) == CTF_ERR)
-    return (ctf_set_errno (ofp, ECTF_NOTYPE));
+    return (ctf_set_typed_errno (ofp, ECTF_NOTYPE));
 
   if (ctf_lookup_by_id (&fp, type) == NULL)
-    return (ctf_set_errno (ofp, ECTF_NOTYPE));
+    return (ctf_set_typed_errno (ofp, ECTF_NOTYPE));
 
   if ((ntype = fp->ctf_ptrtab[LCTF_TYPE_TO_INDEX (fp, type)]) != 0)
     return (LCTF_INDEX_TO_TYPE (fp, ntype, (fp->ctf_flags & LCTF_CHILD)));
 
-  return (ctf_set_errno (ofp, ECTF_NOTYPE));
+  return (ctf_set_typed_errno (ofp, ECTF_NOTYPE));
 }
 
 /* Return the encoding for the specified INTEGER, FLOAT, or ENUM.  */
@@ -1535,10 +1535,7 @@ ctf_enum_value (ctf_dict_t *fp, ctf_id_t type, const char *name, int *valp)
     return -1;			/* errno is set for us.  */
 
   if (LCTF_INFO_KIND (fp, tp->ctt_info) != CTF_K_ENUM)
-    {
-      (void) ctf_set_errno (ofp, ECTF_NOTENUM);
-      return -1;
-    }
+    return ctf_set_errno (ofp, ECTF_NOTENUM);
 
   ctf_get_ctt_size (fp, tp, NULL, &increment);
 
@@ -1557,8 +1554,7 @@ ctf_enum_value (ctf_dict_t *fp, ctf_id_t type, const char *name, int *valp)
 	}
     }
 
-  ctf_set_errno (ofp, ECTF_NOENUMNAM);
-  return -1;
+  return ctf_set_errno (ofp, ECTF_NOENUMNAM);
 }
 
 /* Given a type ID relating to a function type, return info on return types and
diff --git a/libctf/ctf-util.c b/libctf/ctf-util.c
index 9f83ab9..e0d412d 100644
--- a/libctf/ctf-util.c
+++ b/libctf/ctf-util.c
@@ -255,16 +255,6 @@ ctf_set_open_errno (int *errp, int error)
   return NULL;
 }
 
-/* Store the specified error code into the CTF dict, and then return CTF_ERR /
-   -1 for the benefit of the caller. */
-
-unsigned long
-ctf_set_errno (ctf_dict_t *fp, int err)
-{
-  fp->ctf_errno = err;
-  return CTF_ERR;
-}
-
 /* Create a ctf_next_t.  */
 
 ctf_next_t *