Move oniguruma and decNumber to vendor directory (#3234)

vendor/decNumber/example3.c

@@ -0,0 +1,64 @@
+/* ------------------------------------------------------------------ */
+/* Decimal Number Library Demonstration program                       */
+/* ------------------------------------------------------------------ */
+/* Copyright (c) IBM Corporation, 2001.  All rights reserved.         */
+/* ----------------------------------------------------------------+- */
+/*                                                 right margin -->|  */
+
+// example3.c -- calculate compound interest, passive checking
+// Arguments are investment, rate (%), and years
+
+#define  DECNUMDIGITS 38           // work with up to 38 digits
+#include "decNumber.h"             // base number library
+#include <stdio.h>                 // for printf
+
+int main(int argc, char *argv[]) {
+  int need=3;
+  if (argc<need+1) {               // not enough words
+    printf("Please supply %d number(s).\n", need);
+    return 1;
+    }
+
+  { // start of Example 2 segment
+  decNumber one, mtwo, hundred;                   // constants
+  decNumber start, rate, years;                   // parameters
+  decNumber total;                                // result
+  decContext set;                                 // working context
+  char string[DECNUMDIGITS+14];                   // conversion buffer
+
+  decContextDefault(&set, DEC_INIT_BASE);         // initialize
+  set.traps=0;                                    // no traps
+  set.digits=25;                                  // precision 25
+  decNumberFromString(&one,       "1", &set);     // set constants
+  decNumberFromString(&mtwo,     "-2", &set);
+  decNumberFromString(&hundred, "100", &set);
+
+// [snip...
+  decNumberFromString(&start, argv[1], &set);     // parameter words
+  decNumberFromString(&rate,  argv[2], &set);
+  decNumberFromString(&years, argv[3], &set);
+  if (set.status & DEC_Errors) {
+    printf("An input argument word was invalid [%s]\n",
+           decContextStatusToString(&set));
+    return 1;
+    }
+  decNumberDivide(&rate, &rate, &hundred, &set);  // rate=rate/100
+  decNumberAdd(&rate, &rate, &one, &set);         // rate=rate+1
+  decNumberPower(&rate, &rate, &years, &set);     // rate=rate^years
+  decNumberMultiply(&total, &rate, &start, &set); // total=rate*start
+  decNumberRescale(&total, &total, &mtwo, &set);  // two digits please
+  if (set.status & DEC_Errors) {
+    set.status &= DEC_Errors;                     // keep only errors
+    printf("Result could not be calculated [%s]\n",
+           decContextStatusToString(&set));
+    return 1;
+    }
+// ...snip]
+
+  decNumberToString(&total, string);
+  printf("%s at %s%% for %s years => %s\n",
+         argv[1], argv[2], argv[3], string);
+
+  } //---------------------------------------------------------------|
+  return 0;
+  } // main