Improve option --pic. New options --string-pool-name, --null-strings.

tests/jstest4.gperf

@@ -0,0 +1,147 @@
+struct js_keyword {
+  int name;
+  int token;
+}
+%%
+abstract, 1
+boolean, 2
+break, 3
+byte, 4
+case, 5
+catch, 6
+char, 7
+class, 8
+const, 9
+continue, 10
+default, 11
+do, 12
+double, 13
+else, 14
+extends, 15
+false, 16
+final, 17
+finally, 18
+float, 19
+for, 20
+function, 21
+goto, 22
+if, 23
+implements, 24
+import, 25
+in, 26
+instanceof, 27
+int, 28
+interface, 29
+long, 30
+native, 31
+new, 32
+null, 33
+package, 34
+private, 35
+protected, 36
+public, 37
+return, 38
+short, 39
+static, 40
+super, 41
+switch, 42
+synchronized, 43
+this, 44
+throw, 45
+throws, 46
+transient, 47
+true, 48
+try, 49
+var, 50
+void, 51
+while, 52
+with, 53
+%%
+#include <stdlib.h>
+#include <string.h>
+#if defined(__STDC__) || defined(__cplusplus)
+#define CONST const
+#else
+#define CONST
+#endif
+static CONST char* testdata[] = {
+  "bogus",
+  "abstract",
+  "boolean",
+  "break",
+  "byte",
+  "case",
+  "catch",
+  "char",
+  "class",
+  "const",
+  "continue",
+  "default",
+  "do",
+  "double",
+  "else",
+  "extends",
+  "false",
+  "final",
+  "finally",
+  "float",
+  "for",
+  "function",
+  "goto",
+  "if",
+  "implements",
+  "import",
+  "in",
+  "instanceof",
+  "int",
+  "interface",
+  "long",
+  "native",
+  "new",
+  "null",
+  "package",
+  "private",
+  "protected",
+  "public",
+  "return",
+  "short",
+  "static",
+  "super",
+  "switch",
+  "synchronized",
+  "this",
+  "throw",
+  "throws",
+  "transient",
+  "true",
+  "try",
+  "var",
+  "void",
+  "while",
+  "with"
+};
+int main ()
+{
+  int i;
+  for (i = 0; i < sizeof(testdata)/sizeof(testdata[0]); i++)
+    {
+#ifdef CPLUSPLUS_TEST
+      CONST struct js_keyword * resword = Perfect_Hash::in_word_set(testdata[i],strlen(testdata[i]));
+#else
+      CONST struct js_keyword * resword = in_word_set(testdata[i],strlen(testdata[i]));
+#endif
+      if (i > 0)
+        {
+          if (!resword)
+            exit (1);
+          if (strcmp(testdata[i],stringpool+resword->name))
+            exit (1);
+        }
+      else
+        {
+          if (resword)
+            exit (1);
+        }
+    }
+  return 0;
+}