* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/utils/adt/format_type.c,v 1.22 2001/11/12 21:04:46 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/utils/adt/format_type.c,v 1.23 2001/11/19 19:51:20 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include "mb/pg_wchar.h"
#endif
+
#define MASK(b) (1 << (b))
#define MAX_INT32_LEN 11
#define _textin(str) DirectFunctionCall1(textin, CStringGetDatum(str))
-
-static char *format_type_internal(Oid type_oid, int32 typemod, bool allow_invalid);
-
-
-static char *
-psnprintf(size_t len, const char *fmt,...)
-{
- va_list ap;
- char *buf;
-
- buf = palloc(len);
-
- va_start(ap, fmt);
- vsnprintf(buf, len, fmt, ap);
- va_end(ap);
-
- return buf;
-}
+static char *format_type_internal(Oid type_oid, int32 typemod,
+ bool typemod_given, bool allow_invalid);
+static char *psnprintf(size_t len, const char *fmt, ...)
+/* This lets gcc check the format string for consistency. */
+__attribute__((format(printf, 2, 3)));
/*
* a standard type. Otherwise you just get pg_type.typname back,
* double quoted if it contains funny characters.
*
- * If typemod is null (in the SQL sense) then you won't get any
- * "..(x)" type qualifiers. The result is not technically correct,
- * because the various types interpret missing type modifiers
- * differently, but it can be used as a convenient way to format
- * system catalogs, e.g., pg_aggregate, in psql.
+ * If typemod is NULL then we are formatting a type name in a context where
+ * no typemod is available, eg a function argument or result type. This
+ * yields a slightly different result from specifying typemod = -1 in some
+ * cases. Given typemod = -1 we feel compelled to produce an output that
+ * the parser will interpret as having typemod -1, so that pg_dump will
+ * produce CREATE TABLE commands that recreate the original state. But
+ * given NULL typemod, we assume that the parser's interpretation of
+ * typemod doesn't matter, and so we are willing to output a slightly
+ * "prettier" representation of the same type. For example, type = bpchar
+ * and typemod = NULL gets you "character", whereas typemod = -1 gets you
+ * "bpchar" --- the former will be interpreted as character(1) by the
+ * parser, which does not yield typemod -1.
+ *
+ * XXX encoding a meaning in typemod = NULL is ugly; it'd have been
+ * cleaner to make two functions of one and two arguments respectively.
+ * Not worth changing it now, however.
*/
Datum
format_type(PG_FUNCTION_ARGS)
int32 typemod;
char *result;
+ /* Since this function is not strict, we must test for null args */
if (PG_ARGISNULL(0))
PG_RETURN_NULL();
type_oid = PG_GETARG_OID(0);
- if (!PG_ARGISNULL(1))
- typemod = PG_GETARG_INT32(1);
+ if (PG_ARGISNULL(1))
+ {
+ result = format_type_internal(type_oid, -1, false, true);
+ }
else
- typemod = -1; /* default typmod */
-
- result = format_type_internal(type_oid, typemod, true);
+ {
+ typemod = PG_GETARG_INT32(1);
+ result = format_type_internal(type_oid, typemod, true, true);
+ }
PG_RETURN_DATUM(_textin(result));
}
char *
format_type_be(Oid type_oid)
{
- return format_type_internal(type_oid, -1, false);
+ return format_type_internal(type_oid, -1, false, false);
}
/*
char *
format_type_with_typemod(Oid type_oid, int32 typemod)
{
- return format_type_internal(type_oid, typemod, false);
+ return format_type_internal(type_oid, typemod, true, false);
}
static char *
-format_type_internal(Oid type_oid, int32 typemod, bool allow_invalid)
+format_type_internal(Oid type_oid, int32 typemod,
+ bool typemod_given, bool allow_invalid)
{
- bool with_typemod = (typemod >= 0);
+ bool with_typemod = typemod_given && (typemod >= 0);
HeapTuple tuple;
Oid array_base_type;
int16 typlen;
array_base_type = ((Form_pg_type) GETSTRUCT(tuple))->typelem;
typlen = ((Form_pg_type) GETSTRUCT(tuple))->typlen;
- if (array_base_type != 0 && typlen < 0)
+ if (array_base_type != InvalidOid && typlen < 0)
{
/* Switch our attention to the array element type */
ReleaseSysCache(tuple);
if (with_typemod)
buf = psnprintf(5 + MAX_INT32_LEN + 1, "bit(%d)",
(int) typemod);
- else
+ else if (typemod_given)
{
/*
- * bit with no typmod is not the same as BIT, which means
+ * bit with typmod -1 is not the same as BIT, which means
* BIT(1) per SQL spec. Report it as the quoted typename
* so that parser will not assign a bogus typmod.
*/
buf = pstrdup("\"bit\"");
}
+ else
+ buf = pstrdup("bit");
break;
case BOOLOID:
if (with_typemod)
buf = psnprintf(11 + MAX_INT32_LEN + 1, "character(%d)",
(int) (typemod - VARHDRSZ));
- else
+ else if (typemod_given)
{
/*
- * bpchar with no typmod is not the same as CHARACTER,
+ * bpchar with typmod -1 is not the same as CHARACTER,
* which means CHARACTER(1) per SQL spec. Report it as
* bpchar so that parser will not assign a bogus typmod.
*/
buf = pstrdup("bpchar");
}
+ else
+ buf = pstrdup("character");
break;
case CHAROID:
default:
name = NameStr(((Form_pg_type) GETSTRUCT(tuple))->typname);
+ /*
+ * Double-quote the name if it's not a standard identifier.
+ * Note this is *necessary* for ruleutils.c's use.
+ */
if (strspn(name, "abcdefghijklmnopqrstuvwxyz0123456789_") != strlen(name)
|| isdigit((unsigned char) name[0]))
buf = psnprintf(strlen(name) + 3, "\"%s\"", name);
for (num = 0; num < numargs; num++)
{
- char *typename = format_type_internal(oidArray[num], -1, true);
+ char *typename = format_type_internal(oidArray[num], -1,
+ false, true);
+ size_t slen = strlen(typename);
- if (left < strlen(typename) + 2)
+ if (left < (slen + 2))
{
- total += strlen(typename) + 2;
+ total += slen + 2;
result = repalloc(result, total);
- left += strlen(typename) + 2;
+ left += slen + 2;
}
if (num > 0)
left -= 2;
}
strcat(result, typename);
- left -= strlen(typename);
+ left -= slen;
}
PG_RETURN_DATUM(_textin(result));
}
+
+
+/* snprintf into a palloc'd string */
+static char *
+psnprintf(size_t len, const char *fmt, ...)
+{
+ va_list ap;
+ char *buf;
+
+ buf = palloc(len);
+
+ va_start(ap, fmt);
+ vsnprintf(buf, len, fmt, ap);
+ va_end(ap);
+
+ return buf;
+}
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