Fix various typos

This fixes many spelling mistakes in comments, but a few references to
invalid parameter names, function names and option names too in comments
and also some in string constants

Also, fix an #undef that was undefining the incorrect definition

Author: Alexander Lakhin
Reviewed-by: Justin Pryzby
Discussion: https://postgr.es/m/d5f68d19-c0fc-91a9-118d-7c6a5a3f5fad@gmail.com

src/backend/utils/adt/acl.c

@@ -4825,7 +4825,7 @@ RoleMembershipCacheCallback(Datum arg, int cacheid, uint32 hashvalue)
  * Get a list of roles that the specified roleid is a member of
  *
  * Type ROLERECURSE_MEMBERS recurses through all grants; ROLERECURSE_PRIVS
- * recurses only through inheritable grants; and ROLERECURSE_SETROLe recurses
+ * recurses only through inheritable grants; and ROLERECURSE_SETROLE recurses
  * only through grants with set_option.
  *
  * Since indirect membership testing is relatively expensive, we cache
@@ -5020,7 +5020,7 @@ member_can_set_role(Oid member, Oid role)
 }
 
 /*
- * Permission violation eror unless able to SET ROLE to target role.
+ * Permission violation error unless able to SET ROLE to target role.
  */
 void
 check_can_set_role(Oid member, Oid role)

src/backend/utils/adt/array_userfuncs.c

@@ -1043,7 +1043,7 @@ array_agg_array_combine(PG_FUNCTION_ARGS)
 		state1->nitems += state2->nitems;
 
 		state1->dims[0] += state2->dims[0];
-		/* remaing dims already match, per test above */
+		/* remaining dims already match, per test above */
 
 		Assert(state1->array_type == state2->array_type);
 		Assert(state1->element_type == state2->element_type);

src/backend/utils/misc/guc.c

@@ -1387,7 +1387,7 @@ check_GUC_name_for_parameter_acl(const char *name)
  *
  * This performs two sanity checks.  First, it checks that the initial
  * value of a GUC is the same when declared and when loaded to prevent
- * anybody looking at the C declarations of these GUCS from being fooled by
+ * anybody looking at the C declarations of these GUCs from being fooled by
  * mismatched values.  Second, it checks for incorrect flag combinations.
  *
  * The following validation rules apply for the values:
@@ -6272,7 +6272,7 @@ ProcessGUCArray(ArrayType *array, ArrayType *usersetArray,
 			userSetDatum = BoolGetDatum(false);
 
 		/*
-		 * USER SET values are appliciable only for PGC_USERSET parameters. We
+		 * USER SET values are applicable only for PGC_USERSET parameters. We
 		 * use InvalidOid as role in order to evade possible privileges of the
 		 * current user.
 		 */
@@ -6365,8 +6365,8 @@ GUCArrayAdd(ArrayType *array, ArrayType **usersetArray,
 				}
 
 				/*
-				 * Recheck permissons if we found an option without USER SET
-				 * flag while we're setting an optionn with USER SET flag.
+				 * Recheck permissions if we found an option without USER SET
+				 * flag while we're setting an option with USER SET flag.
 				 */
 				if (!currentUserSet && user_set)
 					(void) validate_option_array_item(name, value,

src/backend/utils/misc/ps_status.c

@@ -87,7 +87,7 @@ static size_t ps_buffer_cur_len;	/* nominal strlen(ps_buffer) */
 static size_t ps_buffer_fixed_size; /* size of the constant prefix */
 
 /*
- * Length of ps_buffer before the suffix was appeneded to the end, or 0 if we
+ * Length of ps_buffer before the suffix was appended to the end, or 0 if we
  * didn't set a suffix.
  */
 static size_t ps_buffer_nosuffix_len;

src/backend/utils/mmgr/mcxt.c

@@ -1382,7 +1382,7 @@ MemoryContextAllocAligned(MemoryContext context,
 	alloc_size = size + PallocAlignedExtraBytes(alignto);
 
 #ifdef MEMORY_CONTEXT_CHECKING
-	/* ensure there's space for a sentinal byte */
+	/* ensure there's space for a sentinel byte */
 	alloc_size += 1;
 #endif
 

src/backend/utils/resowner/resowner.c

@@ -521,7 +521,7 @@ ResourceOwnerReleaseInternal(ResourceOwner owner,
 	{
 		/*
 		 * Abort failed buffer IO. AbortBufferIO()->TerminateBufferIO() calls
-		 * ResourceOwnerForgetBufferIOs(), so we just have to iterate till
+		 * ResourceOwnerForgetBufferIO(), so we just have to iterate till
 		 * there are none.
 		 *
 		 * Needs to be before we release buffer pins.