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/*-------------------------------------------------------------------------
*
* bool.c
* Functions for the built-in type "bool".
*
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/bool.c,v 1.27 2003/05/12 23:08:50 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "libpq/pqformat.h"
#include "utils/builtins.h"
/*****************************************************************************
* USER I/O ROUTINES *
*****************************************************************************/
/*
* boolin - converts "t" or "f" to 1 or 0
*
* Check explicitly for "true/false" and TRUE/FALSE, 1/0, YES/NO.
* Reject other values. - thomas 1997-10-05
*
* In the switch statement, check the most-used possibilities first.
*/
Datum
boolin(PG_FUNCTION_ARGS)
{
char *b = PG_GETARG_CSTRING(0);
switch (*b)
{
case 't':
case 'T':
if (strncasecmp(b, "true", strlen(b)) == 0)
PG_RETURN_BOOL(true);
break;
case 'f':
case 'F':
if (strncasecmp(b, "false", strlen(b)) == 0)
PG_RETURN_BOOL(false);
break;
case 'y':
case 'Y':
if (strncasecmp(b, "yes", strlen(b)) == 0)
PG_RETURN_BOOL(true);
break;
case '1':
if (strncasecmp(b, "1", strlen(b)) == 0)
PG_RETURN_BOOL(true);
break;
case 'n':
case 'N':
if (strncasecmp(b, "no", strlen(b)) == 0)
PG_RETURN_BOOL(false);
break;
case '0':
if (strncasecmp(b, "0", strlen(b)) == 0)
PG_RETURN_BOOL(false);
break;
default:
break;
}
elog(ERROR, "Bad boolean external representation '%s'", b);
/* not reached */
PG_RETURN_BOOL(false);
}
/*
* boolout - converts 1 or 0 to "t" or "f"
*/
Datum
boolout(PG_FUNCTION_ARGS)
{
bool b = PG_GETARG_BOOL(0);
char *result = (char *) palloc(2);
result[0] = (b) ? 't' : 'f';
result[1] = '\0';
PG_RETURN_CSTRING(result);
}
/*
* boolrecv - converts external binary format to bool
*
* The external representation is one byte. Any nonzero value is taken
* as "true".
*/
Datum
boolrecv(PG_FUNCTION_ARGS)
{
StringInfo buf = (StringInfo) PG_GETARG_POINTER(0);
int ext;
ext = pq_getmsgbyte(buf);
PG_RETURN_BOOL((ext != 0) ? true : false);
}
/*
* boolsend - converts bool to binary format
*/
Datum
boolsend(PG_FUNCTION_ARGS)
{
bool arg1 = PG_GETARG_BOOL(0);
StringInfoData buf;
pq_begintypsend(&buf);
pq_sendbyte(&buf, arg1 ? 1 : 0);
PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
}
/*****************************************************************************
* PUBLIC ROUTINES *
*****************************************************************************/
Datum
booleq(PG_FUNCTION_ARGS)
{
bool arg1 = PG_GETARG_BOOL(0);
bool arg2 = PG_GETARG_BOOL(1);
PG_RETURN_BOOL(arg1 == arg2);
}
Datum
boolne(PG_FUNCTION_ARGS)
{
bool arg1 = PG_GETARG_BOOL(0);
bool arg2 = PG_GETARG_BOOL(1);
PG_RETURN_BOOL(arg1 != arg2);
}
Datum
boollt(PG_FUNCTION_ARGS)
{
bool arg1 = PG_GETARG_BOOL(0);
bool arg2 = PG_GETARG_BOOL(1);
PG_RETURN_BOOL(arg1 < arg2);
}
Datum
boolgt(PG_FUNCTION_ARGS)
{
bool arg1 = PG_GETARG_BOOL(0);
bool arg2 = PG_GETARG_BOOL(1);
PG_RETURN_BOOL(arg1 > arg2);
}
Datum
boolle(PG_FUNCTION_ARGS)
{
bool arg1 = PG_GETARG_BOOL(0);
bool arg2 = PG_GETARG_BOOL(1);
PG_RETURN_BOOL(arg1 <= arg2);
}
Datum
boolge(PG_FUNCTION_ARGS)
{
bool arg1 = PG_GETARG_BOOL(0);
bool arg2 = PG_GETARG_BOOL(1);
PG_RETURN_BOOL(arg1 >= arg2);
}
/*
* Per SQL92, istrue() and isfalse() should return false, not NULL,
* when presented a NULL input (since NULL is our implementation of
* UNKNOWN). Conversely isnottrue() and isnotfalse() should return true.
* Therefore, these routines are all declared not-strict in pg_proc
* and must do their own checking for null inputs.
*
* Note we don't need isunknown() and isnotunknown() functions, since
* nullvalue() and nonnullvalue() will serve.
*/
Datum
istrue(PG_FUNCTION_ARGS)
{
bool b;
if (PG_ARGISNULL(0))
PG_RETURN_BOOL(false);
b = PG_GETARG_BOOL(0);
PG_RETURN_BOOL(b);
}
Datum
isfalse(PG_FUNCTION_ARGS)
{
bool b;
if (PG_ARGISNULL(0))
PG_RETURN_BOOL(false);
b = PG_GETARG_BOOL(0);
PG_RETURN_BOOL(!b);
}
Datum
isnottrue(PG_FUNCTION_ARGS)
{
bool b;
if (PG_ARGISNULL(0))
PG_RETURN_BOOL(true);
b = PG_GETARG_BOOL(0);
PG_RETURN_BOOL(!b);
}
Datum
isnotfalse(PG_FUNCTION_ARGS)
{
bool b;
if (PG_ARGISNULL(0))
PG_RETURN_BOOL(true);
b = PG_GETARG_BOOL(0);
PG_RETURN_BOOL(b);
}
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