Adding upstream version 15.5.upstream/15.5

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 167 insertions, 0 deletions

diff --git a/src/bin/scripts/common.c b/src/bin/scripts/common.c
new file mode 100644
index 0000000..9e38b60
--- /dev/null
+++ b/src/bin/scripts/common.c
@@ -0,0 +1,167 @@
+/*-------------------------------------------------------------------------
+ *
+ *	common.c
+ *		Common support routines for bin/scripts/
+ *
+ *
+ * Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/bin/scripts/common.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres_fe.h"
+
+#include <signal.h>
+#include <unistd.h>
+
+#include "common.h"
+#include "common/connect.h"
+#include "common/logging.h"
+#include "common/string.h"
+#include "fe_utils/cancel.h"
+#include "fe_utils/query_utils.h"
+#include "fe_utils/string_utils.h"
+
+/*
+ * Split TABLE[(COLUMNS)] into TABLE and [(COLUMNS)] portions.  When you
+ * finish using them, pg_free(*table).  *columns is a pointer into "spec",
+ * possibly to its NUL terminator.
+ */
+void
+splitTableColumnsSpec(const char *spec, int encoding,
+					  char **table, const char **columns)
+{
+	bool		inquotes = false;
+	const char *cp = spec;
+
+	/*
+	 * Find the first '(' not identifier-quoted.  Based on
+	 * dequote_downcase_identifier().
+	 */
+	while (*cp && (*cp != '(' || inquotes))
+	{
+		if (*cp == '"')
+		{
+			if (inquotes && cp[1] == '"')
+				cp++;			/* pair does not affect quoting */
+			else
+				inquotes = !inquotes;
+			cp++;
+		}
+		else
+			cp += PQmblenBounded(cp, encoding);
+	}
+	*table = pnstrdup(spec, cp - spec);
+	*columns = cp;
+}
+
+/*
+ * Break apart TABLE[(COLUMNS)] of "spec".  With the reset_val of search_path
+ * in effect, have regclassin() interpret the TABLE portion.  Append to "buf"
+ * the qualified name of TABLE, followed by any (COLUMNS).  Exit on failure.
+ * We use this to interpret --table=foo under the search path psql would get,
+ * in advance of "ANALYZE public.foo" under the always-secure search path.
+ */
+void
+appendQualifiedRelation(PQExpBuffer buf, const char *spec,
+						PGconn *conn, bool echo)
+{
+	char	   *table;
+	const char *columns;
+	PQExpBufferData sql;
+	PGresult   *res;
+	int			ntups;
+
+	splitTableColumnsSpec(spec, PQclientEncoding(conn), &table, &columns);
+
+	/*
+	 * Query must remain ABSOLUTELY devoid of unqualified names.  This would
+	 * be unnecessary given a regclassin() variant taking a search_path
+	 * argument.
+	 */
+	initPQExpBuffer(&sql);
+	appendPQExpBufferStr(&sql,
+						 "SELECT c.relname, ns.nspname\n"
+						 " FROM pg_catalog.pg_class c,"
+						 " pg_catalog.pg_namespace ns\n"
+						 " WHERE c.relnamespace OPERATOR(pg_catalog.=) ns.oid\n"
+						 "  AND c.oid OPERATOR(pg_catalog.=) ");
+	appendStringLiteralConn(&sql, table, conn);
+	appendPQExpBufferStr(&sql, "::pg_catalog.regclass;");
+
+	executeCommand(conn, "RESET search_path;", echo);
+
+	/*
+	 * One row is a typical result, as is a nonexistent relation ERROR.
+	 * regclassin() unconditionally accepts all-digits input as an OID; if no
+	 * relation has that OID; this query returns no rows.  Catalog corruption
+	 * might elicit other row counts.
+	 */
+	res = executeQuery(conn, sql.data, echo);
+	ntups = PQntuples(res);
+	if (ntups != 1)
+	{
+		pg_log_error(ngettext("query returned %d row instead of one: %s",
+							  "query returned %d rows instead of one: %s",
+							  ntups),
+					 ntups, sql.data);
+		PQfinish(conn);
+		exit(1);
+	}
+	appendPQExpBufferStr(buf,
+						 fmtQualifiedId(PQgetvalue(res, 0, 1),
+										PQgetvalue(res, 0, 0)));
+	appendPQExpBufferStr(buf, columns);
+	PQclear(res);
+	termPQExpBuffer(&sql);
+	pg_free(table);
+
+	PQclear(executeQuery(conn, ALWAYS_SECURE_SEARCH_PATH_SQL, echo));
+}
+
+
+/*
+ * Check yes/no answer in a localized way.  1=yes, 0=no, -1=neither.
+ */
+
+/* translator: abbreviation for "yes" */
+#define PG_YESLETTER gettext_noop("y")
+/* translator: abbreviation for "no" */
+#define PG_NOLETTER gettext_noop("n")
+
+bool
+yesno_prompt(const char *question)
+{
+	char		prompt[256];
+
+	/*------
+	   translator: This is a question followed by the translated options for
+	   "yes" and "no". */
+	snprintf(prompt, sizeof(prompt), _("%s (%s/%s) "),
+			 _(question), _(PG_YESLETTER), _(PG_NOLETTER));
+
+	for (;;)
+	{
+		char	   *resp;
+
+		resp = simple_prompt(prompt, true);
+
+		if (strcmp(resp, _(PG_YESLETTER)) == 0)
+		{
+			free(resp);
+			return true;
+		}
+		if (strcmp(resp, _(PG_NOLETTER)) == 0)
+		{
+			free(resp);
+			return false;
+		}
+		free(resp);
+
+		printf(_("Please answer \"%s\" or \"%s\".\n"),
+			   _(PG_YESLETTER), _(PG_NOLETTER));
+	}
+}