Move oniguruma and decNumber to vendor directory (#3234)

vendor/decNumber/example5.c

@@ -0,0 +1,36 @@
+/* ------------------------------------------------------------------ */
+/* Decimal Number Library Demonstration program                       */
+/* ------------------------------------------------------------------ */
+/* Copyright (c) IBM Corporation, 2001, 2007.  All rights reserved.   */
+/* ----------------------------------------------------------------+- */
+/*                                                 right margin -->|  */
+
+// example5.c -- decimal64 conversions
+
+#include "decimal64.h"             // decimal64 and decNumber library
+#include <stdio.h>                 // for (s)printf
+
+int main(int argc, char *argv[]) {
+  decimal64 a;                     // working decimal64 number
+  decNumber d;                     // working number
+  decContext set;                  // working context
+  char string[DECIMAL64_String];   // number->string buffer
+  char hexes[25];                  // decimal64->hex buffer
+  int i;                           // counter
+
+  if (argc<2) {                    // not enough words
+    printf("Please supply a number.\n");
+    return 1;
+    }
+  decContextDefault(&set, DEC_INIT_DECIMAL64); // initialize
+
+  decimal64FromString(&a, argv[1], &set);
+  // lay out the decimal64 as eight hexadecimal pairs
+  for (i=0; i<8; i++) {
+    sprintf(&hexes[i*3], "%02x ", a.bytes[i]);
+    }
+  decimal64ToNumber(&a, &d);
+  decNumberToString(&d, string);
+  printf("%s => %s=> %s\n", argv[1], hexes, string);
+  return 0;
+  } // main