Move oniguruma and decNumber to vendor directory (#3234)

vendor/decNumber/example7.c

@@ -0,0 +1,35 @@
+/* ------------------------------------------------------------------ */
+/* Decimal Number Library Demonstration program                       */
+/* ------------------------------------------------------------------ */
+/* Copyright (c) IBM Corporation, 2001, 2008.  All rights reserved.   */
+/* ----------------------------------------------------------------+- */
+/*                                                 right margin -->|  */
+
+// example7.c -- using decQuad to add two numbers together
+
+// compile: example7.c decContext.c decQuad.c
+
+#include "decQuad.h"               // decQuad library
+#include <stdio.h>                 // for printf
+
+int main(int argc, char *argv[]) {
+  decQuad a, b;                    // working decQuads
+  decContext set;                  // working context
+  char string[DECQUAD_String];     // number->string buffer
+
+  decContextTestEndian(0);         // warn if DECLITEND is wrong
+
+  if (argc<3) {                    // not enough words
+    printf("Please supply two numbers to add.\n");
+    return 1;
+    }
+  decContextDefault(&set, DEC_INIT_DECQUAD); // initialize
+
+  decQuadFromString(&a, argv[1], &set);
+  decQuadFromString(&b, argv[2], &set);
+  decQuadAdd(&a, &a, &b, &set);    // a=a+b
+  decQuadToString(&a, string);
+
+  printf("%s + %s => %s\n", argv[1], argv[2], string);
+  return 0;
+  } // main