| 328 | |
| 329 | template <typename Char, typename GetArg> |
| 330 | auto parse_header(const Char*& it, const Char* end, format_specs& specs, |
| 331 | GetArg get_arg) -> int { |
| 332 | int arg_index = -1; |
| 333 | if (it == end) return arg_index; |
| 334 | Char c = *it; |
| 335 | if (c >= '0' && c <= '9') { |
| 336 | // Parse an argument index (if followed by '$') or a width possibly |
| 337 | // preceded with '0' flag(s). |
| 338 | int value = parse_nonnegative_int(it, end, -1); |
| 339 | if (it != end && *it == '$') { // value is an argument index |
| 340 | ++it; |
| 341 | arg_index = value != -1 ? value : max_value<int>(); |
| 342 | } else { |
| 343 | if (c == '0') specs.set_fill('0'); |
| 344 | if (value != 0) { |
| 345 | // Nonzero value means that we parsed width and don't need to |
| 346 | // parse it or flags again, so return now. |
| 347 | if (value == -1) report_error("number is too big"); |
| 348 | specs.width = value; |
| 349 | return arg_index; |
| 350 | } |
| 351 | } |
| 352 | } |
| 353 | parse_flags(specs, it, end); |
| 354 | // Parse width. |
| 355 | if (it != end) { |
| 356 | if (*it >= '0' && *it <= '9') { |
| 357 | specs.width = parse_nonnegative_int(it, end, -1); |
| 358 | if (specs.width == -1) report_error("number is too big"); |
| 359 | } else if (*it == '*') { |
| 360 | ++it; |
| 361 | // Check for positional width argument like *1$ |
| 362 | if (it != end && *it >= '0' && *it <= '9') { |
| 363 | int width_index = parse_nonnegative_int(it, end, -1); |
| 364 | if (it != end && *it == '$') { |
| 365 | ++it; |
| 366 | specs.width = static_cast<int>( |
| 367 | get_arg(width_index).visit(detail::printf_width_handler(specs))); |
| 368 | } else { |
| 369 | // Invalid format, rewind and treat as non-positional |
| 370 | report_error("invalid format specifier"); |
| 371 | } |
| 372 | } else { |
| 373 | specs.width = static_cast<int>( |
| 374 | get_arg(-1).visit(detail::printf_width_handler(specs))); |
| 375 | } |
| 376 | } |
| 377 | } |
| 378 | return arg_index; |
| 379 | } |
| 380 | |
| 381 | inline auto parse_printf_presentation_type(char c, type t, bool& upper) |
| 382 | -> presentation_type { |
no test coverage detected