Upgrade ECPG to 2.0

Michael Meskes <meskes@topsystem.de>

src/interfaces/ecpg/preproc/c_keywords.c

@@ -0,0 +1,63 @@
+/*-------------------------------------------------------------------------
+ *
+ * keywords.c--
+ *	  lexical token lookup for reserved words in postgres embedded SQL
+ *
+ *-------------------------------------------------------------------------
+ */
+#include <ctype.h>
+#include <string.h>
+
+#include "postgres.h"
+#include "type.h"
+#include "y.tab.h"
+#include "extern.h"
+
+/*
+ * List of (keyword-name, keyword-token-value) pairs.
+ *
+ * !!WARNING!!: This list must be sorted, because binary
+ *		 search is used to locate entries.
+ */
+static ScanKeyword ScanKeywords[] = {
+	/* name					value			*/
+	{"auto", S_AUTO},
+	{"bool", S_BOOL},
+	{"char", S_CHAR},
+	{"const", S_CONST},
+	{"double", S_DOUBLE},
+	{"extern", S_EXTERN},
+	{"float", S_FLOAT},
+	{"int", S_INT},
+	{"long", S_LONG},
+	{"register", S_REGISTER},
+	{"short", S_SHORT},
+	{"signed", S_SIGNED},
+	{"static", S_STATIC},
+	{"struct", S_STRUCT},
+	{"unsigned", S_UNSIGNED},
+	{"varchar", S_VARCHAR},
+};
+
+ScanKeyword *
+ScanCKeywordLookup(char *text)
+{
+	ScanKeyword *low = &ScanKeywords[0];
+	ScanKeyword *high = endof(ScanKeywords) - 1;
+	ScanKeyword *middle;
+	int			difference;
+
+	while (low <= high)
+	{
+		middle = low + (high - low) / 2;
+		difference = strcmp(middle->name, text);
+		if (difference == 0)
+			return (middle);
+		else if (difference < 0)
+			low = middle + 1;
+		else
+			high = middle - 1;
+	}
+
+	return (NULL);
+}