neovim/test/functional/fixtures/printenv-test.c

#include <stdio.h>

#ifdef MSWIN
# include <windows.h>
#else
# include <stdlib.h>
#endif

#ifdef MSWIN
int wmain(int argc, wchar_t **argv)
#else
int main(int argc, char **argv)
#endif
{
  if (argc != 2) {
    return 1;
  }

#ifdef MSWIN
  wchar_t *value = _wgetenv(argv[1]);
  if (value == NULL) {
    return 1;
  }
  int utf8_len = WideCharToMultiByte(CP_UTF8,
                                     0,
                                     value,
                                     -1,
                                     NULL,
                                     0,
                                     NULL,
                                     NULL);
  if (utf8_len == 0) {
    return (int)GetLastError();
  }
  char *utf8_value = (char *)calloc((size_t)utf8_len, sizeof(char));
  utf8_len = WideCharToMultiByte(CP_UTF8,
                                 0,
                                 value,
                                 -1,
                                 utf8_value,
                                 utf8_len,
                                 NULL,
                                 NULL);
  fprintf(stdout, "%s", utf8_value);
  free(utf8_value);
#else
  char *value = getenv(argv[1]);
  if (value == NULL) {
    fprintf(stderr, "env var not found: %s", argv[1]);
    return 1;
  }
  fprintf(stdout, "%s", value);
#endif
  fflush(stdout);
  return 0;
}