Function print_string_ptr

common/map_sdk/transmission/src/cJSON.cpp:271–331

Render the cstring provided to an escaped version that can be printed. */

/* Render the cstring provided to an escaped version that can be printed. */
static char *print_string_ptr(const char *str) {
  const char *ptr;
  char *ptr2, *out;
  int len = 0;
  unsigned char token;

  if (!str) return cJSON_strdup("");
  ptr = str;
  while ((token = *ptr) && ++len) {
    if (strchr("\"\\\b\f\n\r\t", token)) {
      len++;
    } else if (token < 32) {
      len += 5;
    }
    ptr++;
  }

  out = reinterpret_cast<char *>(cJSON_malloc(len + 3));
  if (!out) return 0;

  ptr2 = out;
  ptr = str;
  *ptr2++ = '\"';
  while (*ptr) {
    if ((unsigned char)*ptr > 31 && *ptr != '\"' && *ptr != '\\') {
      *ptr2++ = *ptr++;
    } else {
      *ptr2++ = '\\';
      switch (token = *ptr++) {
        case '\\':
          *ptr2++ = '\\';
          break;
        case '\"':
          *ptr2++ = '\"';
          break;
        case '\b':
          *ptr2++ = 'b';
          break;
        case '\f':
          *ptr2++ = 'f';
          break;
        case '\n':
          *ptr2++ = 'n';
          break;
        case '\r':
          *ptr2++ = 'r';
          break;
        case '\t':
          *ptr2++ = 't';
          break;
        default:
          sprintf(ptr2, "u%04x", token);
          ptr2 += 5;
          break; /* escape and print */
      }
    }
  }
  *ptr2++ = '\"';