| 1 | // Formatting library for C++ - legacy printf implementation |
| 2 | // |
| 3 | // Copyright (c) 2012 - 2016, Victor Zverovich |
| 4 | // All rights reserved. |
| 5 | // |
| 6 | // For the license information refer to format.h. |
| 7 | |
| 8 | #ifndef FMT_PRINTF_H_ |
| 9 | #define FMT_PRINTF_H_ |
| 10 | |
| 11 | #include <algorithm> // std::max |
| 12 | #include <limits> // std::numeric_limits |
| 13 | |
| 14 | #include "format.h" |
| 15 | |
| 16 | FMT_BEGIN_NAMESPACE |
| 17 | FMT_MODULE_EXPORT_BEGIN |
| 18 | |
| 19 | template <typename T> struct printf_formatter { printf_formatter() = delete; }; |
| 20 | |
| 21 | template <typename Char> |
| 22 | class basic_printf_parse_context : public basic_format_parse_context<Char> { |
| 23 | using basic_format_parse_context<Char>::basic_format_parse_context; |
| 24 | }; |
| 25 | |
| 26 | template <typename OutputIt, typename Char> class basic_printf_context { |
| 27 | private: |
| 28 | OutputIt out_; |
| 29 | basic_format_args<basic_printf_context> args_; |
| 30 | |
| 31 | public: |
| 32 | using char_type = Char; |
| 33 | using format_arg = basic_format_arg<basic_printf_context>; |
| 34 | using parse_context_type = basic_printf_parse_context<Char>; |
| 35 | template <typename T> using formatter_type = printf_formatter<T>; |
| 36 | |
| 37 | /** |
| 38 | \rst |
| 39 | Constructs a ``printf_context`` object. References to the arguments are |
| 40 | stored in the context object so make sure they have appropriate lifetimes. |
| 41 | \endrst |
| 42 | */ |
| 43 | basic_printf_context(OutputIt out, |
| 44 | basic_format_args<basic_printf_context> args) |
| 45 | : out_(out), args_(args) {} |
| 46 | |
| 47 | OutputIt out() { return out_; } |
| 48 | void advance_to(OutputIt it) { out_ = it; } |
| 49 | |
| 50 | detail::locale_ref locale() { return {}; } |
| 51 | |
| 52 | format_arg arg(int id) const { return args_.get(id); } |
| 53 | |
| 54 | FMT_CONSTEXPR void on_error(const char* message) { |
| 55 | detail::error_handler().on_error(message); |
| 56 | } |
| 57 | }; |
| 58 | |
| 59 | FMT_BEGIN_DETAIL_NAMESPACE |
| 60 | |
| 61 | // Checks if a value fits in int - used to avoid warnings about comparing |
| 62 | // signed and unsigned integers. |
| 63 | template <bool IsSigned> struct int_checker { |
| 64 | template <typename T> static bool fits_in_int(T value) { |
| 65 | unsigned max = max_value<int>(); |
| 66 | return value <= max; |
| 67 | } |
| 68 | static bool fits_in_int(bool) { return true; } |
| 69 | }; |
| 70 | |
| 71 | template <> struct int_checker<true> { |
| 72 | template <typename T> static bool fits_in_int(T value) { |
| 73 | return value >= (std::numeric_limits<int>::min)() && |
| 74 | value <= max_value<int>(); |
| 75 | } |
| 76 | static bool fits_in_int(int) { return true; } |
| 77 | }; |
| 78 | |
| 79 | class printf_precision_handler { |
| 80 | public: |
| 81 | template <typename T, FMT_ENABLE_IF(std::is_integral<T>::value)> |
| 82 | int operator()(T value) { |
| 83 | if (!int_checker<std::numeric_limits<T>::is_signed>::fits_in_int(value)) |
| 84 | FMT_THROW(format_error("number is too big")); |
| 85 | return (std::max)(static_cast<int>(value), 0); |
| 86 | } |
| 87 | |
| 88 | template <typename T, FMT_ENABLE_IF(!std::is_integral<T>::value)> |
| 89 | int operator()(T) { |
| 90 | FMT_THROW(format_error("precision is not integer")); |
| 91 | return 0; |
| 92 | } |
| 93 | }; |
| 94 | |
| 95 | // An argument visitor that returns true iff arg is a zero integer. |
| 96 | class is_zero_int { |
| 97 | public: |
| 98 | template <typename T, FMT_ENABLE_IF(std::is_integral<T>::value)> |
| 99 | bool operator()(T value) { |
| 100 | return value == 0; |
| 101 | } |
| 102 | |
| 103 | template <typename T, FMT_ENABLE_IF(!std::is_integral<T>::value)> |
| 104 | bool operator()(T) { |
| 105 | return false; |
| 106 | } |
| 107 | }; |
| 108 | |
| 109 | template <typename T> struct make_unsigned_or_bool : std::make_unsigned<T> {}; |
| 110 | |
| 111 | template <> struct make_unsigned_or_bool<bool> { using type = bool; }; |
| 112 | |
| 113 | template <typename T, typename Context> class arg_converter { |
| 114 | private: |
| 115 | using char_type = typename Context::char_type; |
| 116 | |
| 117 | basic_format_arg<Context>& arg_; |
| 118 | char_type type_; |
| 119 | |
| 120 | public: |
| 121 | arg_converter(basic_format_arg<Context>& arg, char_type type) |
| 122 | : arg_(arg), type_(type) {} |
| 123 | |
| 124 | void operator()(bool value) { |
| 125 | if (type_ != 's') operator()<bool>(value); |
| 126 | } |
| 127 | |
| 128 | template <typename U, FMT_ENABLE_IF(std::is_integral<U>::value)> |
| 129 | void operator()(U value) { |
| 130 | bool is_signed = type_ == 'd' || type_ == 'i'; |
| 131 | using target_type = conditional_t<std::is_same<T, void>::value, U, T>; |
| 132 | if (const_check(sizeof(target_type) <= sizeof(int))) { |
| 133 | // Extra casts are used to silence warnings. |
| 134 | if (is_signed) { |
| 135 | arg_ = detail::make_arg<Context>( |
| 136 | static_cast<int>(static_cast<target_type>(value))); |
| 137 | } else { |
| 138 | using unsigned_type = typename make_unsigned_or_bool<target_type>::type; |
| 139 | arg_ = detail::make_arg<Context>( |
| 140 | static_cast<unsigned>(static_cast<unsigned_type>(value))); |
| 141 | } |
| 142 | } else { |
| 143 | if (is_signed) { |
| 144 | // glibc's printf doesn't sign extend arguments of smaller types: |
| 145 | // std::printf("%lld", -42); // prints "4294967254" |
| 146 | // but we don't have to do the same because it's a UB. |
| 147 | arg_ = detail::make_arg<Context>(static_cast<long long>(value)); |
| 148 | } else { |
| 149 | arg_ = detail::make_arg<Context>( |
| 150 | static_cast<typename make_unsigned_or_bool<U>::type>(value)); |
| 151 | } |
| 152 | } |
| 153 | } |
| 154 | |
| 155 | template <typename U, FMT_ENABLE_IF(!std::is_integral<U>::value)> |
| 156 | void operator()(U) {} // No conversion needed for non-integral types. |
| 157 | }; |
| 158 | |
| 159 | // Converts an integer argument to T for printf, if T is an integral type. |
| 160 | // If T is void, the argument is converted to corresponding signed or unsigned |
| 161 | // type depending on the type specifier: 'd' and 'i' - signed, other - |
| 162 | // unsigned). |
| 163 | template <typename T, typename Context, typename Char> |
| 164 | void convert_arg(basic_format_arg<Context>& arg, Char type) { |
| 165 | visit_format_arg(arg_converter<T, Context>(arg, type), arg); |
| 166 | } |
| 167 | |
| 168 | // Converts an integer argument to char for printf. |
| 169 | template <typename Context> class char_converter { |
| 170 | private: |
| 171 | basic_format_arg<Context>& arg_; |
| 172 | |
| 173 | public: |
| 174 | explicit char_converter(basic_format_arg<Context>& arg) : arg_(arg) {} |
| 175 | |
| 176 | template <typename T, FMT_ENABLE_IF(std::is_integral<T>::value)> |
| 177 | void operator()(T value) { |
| 178 | arg_ = detail::make_arg<Context>( |
| 179 | static_cast<typename Context::char_type>(value)); |
| 180 | } |
| 181 | |
| 182 | template <typename T, FMT_ENABLE_IF(!std::is_integral<T>::value)> |
| 183 | void operator()(T) {} // No conversion needed for non-integral types. |
| 184 | }; |
| 185 | |
| 186 | // An argument visitor that return a pointer to a C string if argument is a |
| 187 | // string or null otherwise. |
| 188 | template <typename Char> struct get_cstring { |
| 189 | template <typename T> const Char* operator()(T) { return nullptr; } |
| 190 | const Char* operator()(const Char* s) { return s; } |
| 191 | }; |
| 192 | |
| 193 | // Checks if an argument is a valid printf width specifier and sets |
| 194 | // left alignment if it is negative. |
| 195 | template <typename Char> class printf_width_handler { |
| 196 | private: |
| 197 | using format_specs = basic_format_specs<Char>; |
| 198 | |
| 199 | format_specs& specs_; |
| 200 | |
| 201 | public: |
| 202 | explicit printf_width_handler(format_specs& specs) : specs_(specs) {} |
| 203 | |
| 204 | template <typename T, FMT_ENABLE_IF(std::is_integral<T>::value)> |
| 205 | unsigned operator()(T value) { |
| 206 | auto width = static_cast<uint32_or_64_or_128_t<T>>(value); |
| 207 | if (detail::is_negative(value)) { |
| 208 | specs_.align = align::left; |
| 209 | width = 0 - width; |
| 210 | } |
| 211 | unsigned int_max = max_value<int>(); |
| 212 | if (width > int_max) FMT_THROW(format_error("number is too big")); |
| 213 | return static_cast<unsigned>(width); |
| 214 | } |
| 215 | |
| 216 | template <typename T, FMT_ENABLE_IF(!std::is_integral<T>::value)> |
| 217 | unsigned operator()(T) { |
| 218 | FMT_THROW(format_error("width is not integer")); |
| 219 | return 0; |
| 220 | } |
| 221 | }; |
| 222 | |
| 223 | // The ``printf`` argument formatter. |
| 224 | template <typename OutputIt, typename Char> |
| 225 | class printf_arg_formatter : public arg_formatter<Char> { |
| 226 | private: |
| 227 | using base = arg_formatter<Char>; |
| 228 | using context_type = basic_printf_context<OutputIt, Char>; |
| 229 | using format_specs = basic_format_specs<Char>; |
| 230 | |
| 231 | context_type& context_; |
| 232 | |
| 233 | OutputIt write_null_pointer(bool is_string = false) { |
| 234 | auto s = this->specs; |
| 235 | s.type = presentation_type::none; |
| 236 | return write_bytes(this->out, is_string ? "(null)" : "(nil)", s); |
| 237 | } |
| 238 | |
| 239 | public: |
| 240 | printf_arg_formatter(OutputIt iter, format_specs& s, context_type& ctx) |
| 241 | : base{iter, s, locale_ref()}, context_(ctx) {} |
| 242 | |
| 243 | OutputIt operator()(monostate value) { return base::operator()(value); } |
| 244 | |
| 245 | template <typename T, FMT_ENABLE_IF(detail::is_integral<T>::value)> |
| 246 | OutputIt operator()(T value) { |
| 247 | // MSVC2013 fails to compile separate overloads for bool and Char so use |
| 248 | // std::is_same instead. |
| 249 | if (std::is_same<T, Char>::value) { |
| 250 | format_specs fmt_specs = this->specs; |
| 251 | if (fmt_specs.type != presentation_type::none && |
| 252 | fmt_specs.type != presentation_type::chr) { |
| 253 | return (*this)(static_cast<int>(value)); |
| 254 | } |
| 255 | fmt_specs.sign = sign::none; |
| 256 | fmt_specs.alt = false; |
| 257 | fmt_specs.fill[0] = ' '; // Ignore '0' flag for char types. |
| 258 | // align::numeric needs to be overwritten here since the '0' flag is |
| 259 | // ignored for non-numeric types |
| 260 | if (fmt_specs.align == align::none || fmt_specs.align == align::numeric) |
| 261 | fmt_specs.align = align::right; |
| 262 | return write<Char>(this->out, static_cast<Char>(value), fmt_specs); |
| 263 | } |
| 264 | return base::operator()(value); |
| 265 | } |
| 266 | |
| 267 | template <typename T, FMT_ENABLE_IF(std::is_floating_point<T>::value)> |
| 268 | OutputIt operator()(T value) { |
| 269 | return base::operator()(value); |
| 270 | } |
| 271 | |
| 272 | /** Formats a null-terminated C string. */ |
| 273 | OutputIt operator()(const char* value) { |
| 274 | if (value) return base::operator()(value); |
| 275 | return write_null_pointer(this->specs.type != presentation_type::pointer); |
| 276 | } |
| 277 | |
| 278 | /** Formats a null-terminated wide C string. */ |
| 279 | OutputIt operator()(const wchar_t* value) { |
| 280 | if (value) return base::operator()(value); |
| 281 | return write_null_pointer(this->specs.type != presentation_type::pointer); |
| 282 | } |
| 283 | |
| 284 | OutputIt operator()(basic_string_view<Char> value) { |
| 285 | return base::operator()(value); |
| 286 | } |
| 287 | |
| 288 | /** Formats a pointer. */ |
| 289 | OutputIt operator()(const void* value) { |
| 290 | return value ? base::operator()(value) : write_null_pointer(); |
| 291 | } |
| 292 | |
| 293 | /** Formats an argument of a custom (user-defined) type. */ |
| 294 | OutputIt operator()(typename basic_format_arg<context_type>::handle handle) { |
| 295 | auto parse_ctx = |
| 296 | basic_printf_parse_context<Char>(basic_string_view<Char>()); |
| 297 | handle.format(parse_ctx, context_); |
| 298 | return this->out; |
| 299 | } |
| 300 | }; |
| 301 | |
| 302 | template <typename Char> |
| 303 | void parse_flags(basic_format_specs<Char>& specs, const Char*& it, |
| 304 | const Char* end) { |
| 305 | for (; it != end; ++it) { |
| 306 | switch (*it) { |
| 307 | case '-': |
| 308 | specs.align = align::left; |
| 309 | break; |
| 310 | case '+': |
| 311 | specs.sign = sign::plus; |
| 312 | break; |
| 313 | case '0': |
| 314 | specs.fill[0] = '0'; |
| 315 | break; |
| 316 | case ' ': |
| 317 | if (specs.sign != sign::plus) { |
| 318 | specs.sign = sign::space; |
| 319 | } |
| 320 | break; |
| 321 | case '#': |
| 322 | specs.alt = true; |
| 323 | break; |
| 324 | default: |
| 325 | return; |
| 326 | } |
| 327 | } |
| 328 | } |
| 329 | |
| 330 | template <typename Char, typename GetArg> |
| 331 | int parse_header(const Char*& it, const Char* end, |
| 332 | basic_format_specs<Char>& specs, GetArg get_arg) { |
| 333 | int arg_index = -1; |
| 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.fill[0] = '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) FMT_THROW(format_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) FMT_THROW(format_error("number is too big")); |
| 359 | } else if (*it == '*') { |
| 360 | ++it; |
| 361 | specs.width = static_cast<int>(visit_format_arg( |
| 362 | detail::printf_width_handler<Char>(specs), get_arg(-1))); |
| 363 | } |
| 364 | } |
| 365 | return arg_index; |
| 366 | } |
| 367 | |
| 368 | template <typename Char, typename Context> |
| 369 | void vprintf(buffer<Char>& buf, basic_string_view<Char> format, |
| 370 | basic_format_args<Context> args) { |
| 371 | using OutputIt = buffer_appender<Char>; |
| 372 | auto out = OutputIt(buf); |
| 373 | auto context = basic_printf_context<OutputIt, Char>(out, args); |
| 374 | auto parse_ctx = basic_printf_parse_context<Char>(format); |
| 375 | |
| 376 | // Returns the argument with specified index or, if arg_index is -1, the next |
| 377 | // argument. |
| 378 | auto get_arg = [&](int arg_index) { |
| 379 | if (arg_index < 0) |
| 380 | arg_index = parse_ctx.next_arg_id(); |
| 381 | else |
| 382 | parse_ctx.check_arg_id(--arg_index); |
| 383 | return detail::get_arg(context, arg_index); |
| 384 | }; |
| 385 | |
| 386 | const Char* start = parse_ctx.begin(); |
| 387 | const Char* end = parse_ctx.end(); |
| 388 | auto it = start; |
| 389 | while (it != end) { |
| 390 | if (!detail::find<false, Char>(it, end, '%', it)) { |
| 391 | it = end; // detail::find leaves it == nullptr if it doesn't find '%' |
| 392 | break; |
| 393 | } |
| 394 | Char c = *it++; |
| 395 | if (it != end && *it == c) { |
| 396 | out = detail::write( |
| 397 | out, basic_string_view<Char>(start, detail::to_unsigned(it - start))); |
| 398 | start = ++it; |
| 399 | continue; |
| 400 | } |
| 401 | out = detail::write(out, basic_string_view<Char>( |
| 402 | start, detail::to_unsigned(it - 1 - start))); |
| 403 | |
| 404 | basic_format_specs<Char> specs; |
| 405 | specs.align = align::right; |
| 406 | |
| 407 | // Parse argument index, flags and width. |
| 408 | int arg_index = parse_header(it, end, specs, get_arg); |
| 409 | if (arg_index == 0) parse_ctx.on_error("argument not found"); |
| 410 | |
| 411 | // Parse precision. |
| 412 | if (it != end && *it == '.') { |
| 413 | ++it; |
| 414 | c = it != end ? *it : 0; |
| 415 | if ('0' <= c && c <= '9') { |
| 416 | specs.precision = parse_nonnegative_int(it, end, 0); |
| 417 | } else if (c == '*') { |
| 418 | ++it; |
| 419 | specs.precision = static_cast<int>( |
| 420 | visit_format_arg(detail::printf_precision_handler(), get_arg(-1))); |
| 421 | } else { |
| 422 | specs.precision = 0; |
| 423 | } |
| 424 | } |
| 425 | |
| 426 | auto arg = get_arg(arg_index); |
| 427 | // For d, i, o, u, x, and X conversion specifiers, if a precision is |
| 428 | // specified, the '0' flag is ignored |
| 429 | if (specs.precision >= 0 && arg.is_integral()) |
| 430 | specs.fill[0] = |
| 431 | ' '; // Ignore '0' flag for non-numeric types or if '-' present. |
| 432 | if (specs.precision >= 0 && arg.type() == detail::type::cstring_type) { |
| 433 | auto str = visit_format_arg(detail::get_cstring<Char>(), arg); |
| 434 | auto str_end = str + specs.precision; |
| 435 | auto nul = std::find(str, str_end, Char()); |
| 436 | arg = detail::make_arg<basic_printf_context<OutputIt, Char>>( |
| 437 | basic_string_view<Char>( |
| 438 | str, detail::to_unsigned(nul != str_end ? nul - str |
| 439 | : specs.precision))); |
| 440 | } |
| 441 | if (specs.alt && visit_format_arg(detail::is_zero_int(), arg)) |
| 442 | specs.alt = false; |
| 443 | if (specs.fill[0] == '0') { |
| 444 | if (arg.is_arithmetic() && specs.align != align::left) |
| 445 | specs.align = align::numeric; |
| 446 | else |
| 447 | specs.fill[0] = ' '; // Ignore '0' flag for non-numeric types or if '-' |
| 448 | // flag is also present. |
| 449 | } |
| 450 | |
| 451 | // Parse length and convert the argument to the required type. |
| 452 | c = it != end ? *it++ : 0; |
| 453 | Char t = it != end ? *it : 0; |
| 454 | using detail::convert_arg; |
| 455 | switch (c) { |
| 456 | case 'h': |
| 457 | if (t == 'h') { |
| 458 | ++it; |
| 459 | t = it != end ? *it : 0; |
| 460 | convert_arg<signed char>(arg, t); |
| 461 | } else { |
| 462 | convert_arg<short>(arg, t); |
| 463 | } |
| 464 | break; |
| 465 | case 'l': |
| 466 | if (t == 'l') { |
| 467 | ++it; |
| 468 | t = it != end ? *it : 0; |
| 469 | convert_arg<long long>(arg, t); |
| 470 | } else { |
| 471 | convert_arg<long>(arg, t); |
| 472 | } |
| 473 | break; |
| 474 | case 'j': |
| 475 | convert_arg<intmax_t>(arg, t); |
| 476 | break; |
| 477 | case 'z': |
| 478 | convert_arg<size_t>(arg, t); |
| 479 | break; |
| 480 | case 't': |
| 481 | convert_arg<std::ptrdiff_t>(arg, t); |
| 482 | break; |
| 483 | case 'L': |
| 484 | // printf produces garbage when 'L' is omitted for long double, no |
| 485 | // need to do the same. |
| 486 | break; |
| 487 | default: |
| 488 | --it; |
| 489 | convert_arg<void>(arg, c); |
| 490 | } |
| 491 | |
| 492 | // Parse type. |
| 493 | if (it == end) FMT_THROW(format_error("invalid format string")); |
| 494 | char type = static_cast<char>(*it++); |
| 495 | if (arg.is_integral()) { |
| 496 | // Normalize type. |
| 497 | switch (type) { |
| 498 | case 'i': |
| 499 | case 'u': |
| 500 | type = 'd'; |
| 501 | break; |
| 502 | case 'c': |
| 503 | visit_format_arg( |
| 504 | detail::char_converter<basic_printf_context<OutputIt, Char>>(arg), |
| 505 | arg); |
| 506 | break; |
| 507 | } |
| 508 | } |
| 509 | specs.type = parse_presentation_type(type); |
| 510 | if (specs.type == presentation_type::none) |
| 511 | parse_ctx.on_error("invalid type specifier"); |
| 512 | |
| 513 | start = it; |
| 514 | |
| 515 | // Format argument. |
| 516 | out = visit_format_arg( |
| 517 | detail::printf_arg_formatter<OutputIt, Char>(out, specs, context), arg); |
| 518 | } |
| 519 | detail::write(out, basic_string_view<Char>(start, to_unsigned(it - start))); |
| 520 | } |
| 521 | FMT_END_DETAIL_NAMESPACE |
| 522 | |
| 523 | template <typename Char> |
| 524 | using basic_printf_context_t = |
| 525 | basic_printf_context<detail::buffer_appender<Char>, Char>; |
| 526 | |
| 527 | using printf_context = basic_printf_context_t<char>; |
| 528 | using wprintf_context = basic_printf_context_t<wchar_t>; |
| 529 | |
| 530 | using printf_args = basic_format_args<printf_context>; |
| 531 | using wprintf_args = basic_format_args<wprintf_context>; |
| 532 | |
| 533 | /** |
| 534 | \rst |
| 535 | Constructs an `~fmt::format_arg_store` object that contains references to |
| 536 | arguments and can be implicitly converted to `~fmt::printf_args`. |
| 537 | \endrst |
| 538 | */ |
| 539 | template <typename... T> |
| 540 | inline auto make_printf_args(const T&... args) |
| 541 | -> format_arg_store<printf_context, T...> { |
| 542 | return {args...}; |
| 543 | } |
| 544 | |
| 545 | /** |
| 546 | \rst |
| 547 | Constructs an `~fmt::format_arg_store` object that contains references to |
| 548 | arguments and can be implicitly converted to `~fmt::wprintf_args`. |
| 549 | \endrst |
| 550 | */ |
| 551 | template <typename... T> |
| 552 | inline auto make_wprintf_args(const T&... args) |
| 553 | -> format_arg_store<wprintf_context, T...> { |
| 554 | return {args...}; |
| 555 | } |
| 556 | |
| 557 | template <typename S, typename Char = char_t<S>> |
| 558 | inline auto vsprintf( |
| 559 | const S& fmt, |
| 560 | basic_format_args<basic_printf_context_t<type_identity_t<Char>>> args) |
| 561 | -> std::basic_string<Char> { |
| 562 | basic_memory_buffer<Char> buffer; |
| 563 | vprintf(buffer, detail::to_string_view(fmt), args); |
| 564 | return to_string(buffer); |
| 565 | } |
| 566 | |
| 567 | /** |
| 568 | \rst |
| 569 | Formats arguments and returns the result as a string. |
| 570 | |
| 571 | **Example**:: |
| 572 | |
| 573 | std::string message = fmt::sprintf("The answer is %d", 42); |
| 574 | \endrst |
| 575 | */ |
| 576 | template <typename S, typename... T, |
| 577 | typename Char = enable_if_t<detail::is_string<S>::value, char_t<S>>> |
| 578 | inline auto sprintf(const S& fmt, const T&... args) -> std::basic_string<Char> { |
| 579 | using context = basic_printf_context_t<Char>; |
| 580 | return vsprintf(detail::to_string_view(fmt), |
| 581 | fmt::make_format_args<context>(args...)); |
| 582 | } |
| 583 | |
| 584 | template <typename S, typename Char = char_t<S>> |
| 585 | inline auto vfprintf( |
| 586 | std::FILE* f, const S& fmt, |
| 587 | basic_format_args<basic_printf_context_t<type_identity_t<Char>>> args) |
| 588 | -> int { |
| 589 | basic_memory_buffer<Char> buffer; |
| 590 | vprintf(buffer, detail::to_string_view(fmt), args); |
| 591 | size_t size = buffer.size(); |
| 592 | return std::fwrite(buffer.data(), sizeof(Char), size, f) < size |
| 593 | ? -1 |
| 594 | : static_cast<int>(size); |
| 595 | } |
| 596 | |
| 597 | /** |
| 598 | \rst |
| 599 | Prints formatted data to the file *f*. |
| 600 | |
| 601 | **Example**:: |
| 602 | |
| 603 | fmt::fprintf(stderr, "Don't %s!", "panic"); |
| 604 | \endrst |
| 605 | */ |
| 606 | template <typename S, typename... T, typename Char = char_t<S>> |
| 607 | inline auto fprintf(std::FILE* f, const S& fmt, const T&... args) -> int { |
| 608 | using context = basic_printf_context_t<Char>; |
| 609 | return vfprintf(f, detail::to_string_view(fmt), |
| 610 | fmt::make_format_args<context>(args...)); |
| 611 | } |
| 612 | |
| 613 | template <typename S, typename Char = char_t<S>> |
| 614 | inline auto vprintf( |
| 615 | const S& fmt, |
| 616 | basic_format_args<basic_printf_context_t<type_identity_t<Char>>> args) |
| 617 | -> int { |
| 618 | return vfprintf(stdout, detail::to_string_view(fmt), args); |
| 619 | } |
| 620 | |
| 621 | /** |
| 622 | \rst |
| 623 | Prints formatted data to ``stdout``. |
| 624 | |
| 625 | **Example**:: |
| 626 | |
| 627 | fmt::printf("Elapsed time: %.2f seconds", 1.23); |
| 628 | \endrst |
| 629 | */ |
| 630 | template <typename S, typename... T, FMT_ENABLE_IF(detail::is_string<S>::value)> |
| 631 | inline auto printf(const S& fmt, const T&... args) -> int { |
| 632 | return vprintf( |
| 633 | detail::to_string_view(fmt), |
| 634 | fmt::make_format_args<basic_printf_context_t<char_t<S>>>(args...)); |
| 635 | } |
| 636 | |
| 637 | FMT_MODULE_EXPORT_END |
| 638 | FMT_END_NAMESPACE |
| 639 | |
| 640 | #endif // FMT_PRINTF_H_ |