grpc_3rd/libuv/test/test-get-currentexe.c

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 *
 * The above copyright notice and this permission notice shall be included in
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#include "uv.h"
#include "task.h"
#include <string.h>

#define PATHMAX 1024
extern char executable_path[];

TEST_IMPL(get_currentexe) {
  char buffer[PATHMAX];
  size_t size;
  char* match;
  char* path;
  int r;

  size = sizeof(buffer) / sizeof(buffer[0]);
  r = uv_exepath(buffer, &size);
  ASSERT(!r);

  /* uv_exepath can return an absolute path on darwin, so if the test runner
   * was run with a relative prefix of "./", we need to strip that prefix off
   * executable_path or we'll fail. */
  if (executable_path[0] == '.' && executable_path[1] == '/') {
    path = executable_path + 2;
  } else {
    path = executable_path;
  }

  match = strstr(buffer, path);
  /* Verify that the path returned from uv_exepath is a subdirectory of
   * executable_path.
   */
  ASSERT(match && !strcmp(match, path));
  ASSERT(size == strlen(buffer));

  /* Negative tests */
  size = sizeof(buffer) / sizeof(buffer[0]);
  r = uv_exepath(NULL, &size);
  ASSERT(r == UV_EINVAL);

  r = uv_exepath(buffer, NULL);
  ASSERT(r == UV_EINVAL);

  size = 0;
  r = uv_exepath(buffer, &size);
  ASSERT(r == UV_EINVAL);

  memset(buffer, -1, sizeof(buffer));

  size = 1;
  r = uv_exepath(buffer, &size);
  ASSERT(r == 0);
  ASSERT(size == 0);
  ASSERT(buffer[0] == '\0');

  memset(buffer, -1, sizeof(buffer));

  size = 2;
  r = uv_exepath(buffer, &size);
  ASSERT(r == 0);
  ASSERT(size == 1);
  ASSERT(buffer[0] != '\0');
  ASSERT(buffer[1] == '\0');

  return 0;
}