ceph/src/jaegertracing/opentelemetry-cpp/third_party/prometheus-cpp/3rdparty/civetweb/src/third_party/duktape-1.5.2/examples/eval/eval.c

   1 /*
   2  *  Very simple example program for evaluating expressions from
   3  *  command line
   4  */
   5
   6 #include "duktape.h"
   7 #include <stdio.h>
   8
   9 static int eval_raw(duk_context *ctx) {
  10         duk_eval(ctx);
  11         return 1;
  12 }
  13
  14 static int tostring_raw(duk_context *ctx) {
  15         duk_to_string(ctx, -1);
  16         return 1;
  17 }
  18
  19 static void usage_exit(void) {
  20         fprintf(stderr, "Usage: eval <expression> [<expression>] ...\n");
  21         fflush(stderr);
  22         exit(1);
  23 }
  24
  25 int main(int argc, char *argv[]) {
  26         duk_context *ctx;
  27         int i;
  28         const char *res;
  29
  30         if (argc < 2) {
  31                 usage_exit();
  32         }
  33
  34         ctx = duk_create_heap_default();
  35         for (i = 1; i < argc; i++) {
  36                 printf("=== eval: '%s' ===\n", argv[i]);
  37                 duk_push_string(ctx, argv[i]);
  38                 duk_safe_call(ctx, eval_raw, 1 /*nargs*/, 1 /*nrets*/);
  39                 duk_safe_call(ctx, tostring_raw, 1 /*nargs*/, 1 /*nrets*/);
  40                 res = duk_get_string(ctx, -1);
  41                 printf("%s\n", res ? res : "null");
  42                 duk_pop(ctx);
  43         }
  44
  45         duk_destroy_heap(ctx);
  46
  47         return 0;
  48 }