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-rw-r--r--src/backend/utils/adt/bool.c404
1 files changed, 404 insertions, 0 deletions
diff --git a/src/backend/utils/adt/bool.c b/src/backend/utils/adt/bool.c
new file mode 100644
index 0000000..fe11d1a
--- /dev/null
+++ b/src/backend/utils/adt/bool.c
@@ -0,0 +1,404 @@
+/*-------------------------------------------------------------------------
+ *
+ * bool.c
+ * Functions for the built-in type "bool".
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ *
+ * IDENTIFICATION
+ * src/backend/utils/adt/bool.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include <ctype.h>
+
+#include "libpq/pqformat.h"
+#include "utils/builtins.h"
+
+/*
+ * Try to interpret value as boolean value. Valid values are: true,
+ * false, yes, no, on, off, 1, 0; as well as unique prefixes thereof.
+ * If the string parses okay, return true, else false.
+ * If okay and result is not NULL, return the value in *result.
+ */
+bool
+parse_bool(const char *value, bool *result)
+{
+ return parse_bool_with_len(value, strlen(value), result);
+}
+
+bool
+parse_bool_with_len(const char *value, size_t len, bool *result)
+{
+ switch (*value)
+ {
+ case 't':
+ case 'T':
+ if (pg_strncasecmp(value, "true", len) == 0)
+ {
+ if (result)
+ *result = true;
+ return true;
+ }
+ break;
+ case 'f':
+ case 'F':
+ if (pg_strncasecmp(value, "false", len) == 0)
+ {
+ if (result)
+ *result = false;
+ return true;
+ }
+ break;
+ case 'y':
+ case 'Y':
+ if (pg_strncasecmp(value, "yes", len) == 0)
+ {
+ if (result)
+ *result = true;
+ return true;
+ }
+ break;
+ case 'n':
+ case 'N':
+ if (pg_strncasecmp(value, "no", len) == 0)
+ {
+ if (result)
+ *result = false;
+ return true;
+ }
+ break;
+ case 'o':
+ case 'O':
+ /* 'o' is not unique enough */
+ if (pg_strncasecmp(value, "on", (len > 2 ? len : 2)) == 0)
+ {
+ if (result)
+ *result = true;
+ return true;
+ }
+ else if (pg_strncasecmp(value, "off", (len > 2 ? len : 2)) == 0)
+ {
+ if (result)
+ *result = false;
+ return true;
+ }
+ break;
+ case '1':
+ if (len == 1)
+ {
+ if (result)
+ *result = true;
+ return true;
+ }
+ break;
+ case '0':
+ if (len == 1)
+ {
+ if (result)
+ *result = false;
+ return true;
+ }
+ break;
+ default:
+ break;
+ }
+
+ if (result)
+ *result = false; /* suppress compiler warning */
+ return false;
+}
+
+/*****************************************************************************
+ * 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, ON/OFF.
+ * Reject other values.
+ *
+ * In the switch statement, check the most-used possibilities first.
+ */
+Datum
+boolin(PG_FUNCTION_ARGS)
+{
+ const char *in_str = PG_GETARG_CSTRING(0);
+ const char *str;
+ size_t len;
+ bool result;
+
+ /*
+ * Skip leading and trailing whitespace
+ */
+ str = in_str;
+ while (isspace((unsigned char) *str))
+ str++;
+
+ len = strlen(str);
+ while (len > 0 && isspace((unsigned char) str[len - 1]))
+ len--;
+
+ if (parse_bool_with_len(str, len, &result))
+ PG_RETURN_BOOL(result);
+
+ ereport(ERROR,
+ (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
+ errmsg("invalid input syntax for type %s: \"%s\"",
+ "boolean", in_str)));
+
+ /* 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));
+}
+
+/*
+ * booltext - cast function for bool => text
+ *
+ * We need this because it's different from the behavior of boolout();
+ * this function follows the SQL-spec result (except for producing lower case)
+ */
+Datum
+booltext(PG_FUNCTION_ARGS)
+{
+ bool arg1 = PG_GETARG_BOOL(0);
+ const char *str;
+
+ if (arg1)
+ str = "true";
+ else
+ str = "false";
+
+ PG_RETURN_TEXT_P(cstring_to_text(str));
+}
+
+
+/*****************************************************************************
+ * 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);
+}
+
+/*
+ * boolean-and and boolean-or aggregates.
+ */
+
+/*
+ * Function for standard EVERY aggregate conforming to SQL 2003.
+ * The aggregate is also named bool_and for consistency.
+ *
+ * Note: this is only used in plain aggregate mode, not moving-aggregate mode.
+ */
+Datum
+booland_statefunc(PG_FUNCTION_ARGS)
+{
+ PG_RETURN_BOOL(PG_GETARG_BOOL(0) && PG_GETARG_BOOL(1));
+}
+
+/*
+ * Function for standard ANY/SOME aggregate conforming to SQL 2003.
+ * The aggregate is named bool_or, because ANY/SOME have parsing conflicts.
+ *
+ * Note: this is only used in plain aggregate mode, not moving-aggregate mode.
+ */
+Datum
+boolor_statefunc(PG_FUNCTION_ARGS)
+{
+ PG_RETURN_BOOL(PG_GETARG_BOOL(0) || PG_GETARG_BOOL(1));
+}
+
+typedef struct BoolAggState
+{
+ int64 aggcount; /* number of non-null values aggregated */
+ int64 aggtrue; /* number of values aggregated that are true */
+} BoolAggState;
+
+static BoolAggState *
+makeBoolAggState(FunctionCallInfo fcinfo)
+{
+ BoolAggState *state;
+ MemoryContext agg_context;
+
+ if (!AggCheckCallContext(fcinfo, &agg_context))
+ elog(ERROR, "aggregate function called in non-aggregate context");
+
+ state = (BoolAggState *) MemoryContextAlloc(agg_context,
+ sizeof(BoolAggState));
+ state->aggcount = 0;
+ state->aggtrue = 0;
+
+ return state;
+}
+
+Datum
+bool_accum(PG_FUNCTION_ARGS)
+{
+ BoolAggState *state;
+
+ state = PG_ARGISNULL(0) ? NULL : (BoolAggState *) PG_GETARG_POINTER(0);
+
+ /* Create the state data on first call */
+ if (state == NULL)
+ state = makeBoolAggState(fcinfo);
+
+ if (!PG_ARGISNULL(1))
+ {
+ state->aggcount++;
+ if (PG_GETARG_BOOL(1))
+ state->aggtrue++;
+ }
+
+ PG_RETURN_POINTER(state);
+}
+
+Datum
+bool_accum_inv(PG_FUNCTION_ARGS)
+{
+ BoolAggState *state;
+
+ state = PG_ARGISNULL(0) ? NULL : (BoolAggState *) PG_GETARG_POINTER(0);
+
+ /* bool_accum should have created the state data */
+ if (state == NULL)
+ elog(ERROR, "bool_accum_inv called with NULL state");
+
+ if (!PG_ARGISNULL(1))
+ {
+ state->aggcount--;
+ if (PG_GETARG_BOOL(1))
+ state->aggtrue--;
+ }
+
+ PG_RETURN_POINTER(state);
+}
+
+Datum
+bool_alltrue(PG_FUNCTION_ARGS)
+{
+ BoolAggState *state;
+
+ state = PG_ARGISNULL(0) ? NULL : (BoolAggState *) PG_GETARG_POINTER(0);
+
+ /* if there were no non-null values, return NULL */
+ if (state == NULL || state->aggcount == 0)
+ PG_RETURN_NULL();
+
+ /* true if all non-null values are true */
+ PG_RETURN_BOOL(state->aggtrue == state->aggcount);
+}
+
+Datum
+bool_anytrue(PG_FUNCTION_ARGS)
+{
+ BoolAggState *state;
+
+ state = PG_ARGISNULL(0) ? NULL : (BoolAggState *) PG_GETARG_POINTER(0);
+
+ /* if there were no non-null values, return NULL */
+ if (state == NULL || state->aggcount == 0)
+ PG_RETURN_NULL();
+
+ /* true if any non-null value is true */
+ PG_RETURN_BOOL(state->aggtrue > 0);
+}
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