FreeBSD Manual Pages
std::fgetws(3) C++ Standard Libary std::fgetws(3) NAME std::fgetws - std::fgetws Synopsis Defined in header <cwchar> wchar_t* fgetws( wchar_t* str, int count, std::FILE* stream ); Reads at most count - 1 wide characters from the given file stream and stores them in str. The produced wide string is always null-terminated. Parsing stops if end-of-file occurs or a newline wide character is found, in which case str will contain that wide newline character. Parameters str - wide string to read the characters to count - the length of str stream - file stream to read the data from Return value str on success, a null pointer on an error. Example // Run this code #include <array> #include <clocale> #include <cstdio> #include <cstdlib> #include <cwchar> #include <cwctype> #include <iomanip> #include <iostream> #include <span> #include <string> void dump(std::span<const wchar_t> sp, std::size_t width = 14) { for (wchar_t wc : sp) std::wcout << (std::iswprint(wc) ? wc : L'.'); std::wcout << std::wstring(width > sp.size() ? width - sp.size() : 1, L' ') << std::hex << std::uppercase << std::setfill(L'0'); for (wchar_t wc : sp) std::wcout << std::setw(sizeof wc) << static_cast<un- signed>(wc) << ' '; std::wcout << '\n'; } int main() { // Create temp file that contains wide characters std::setlocale(LC_ALL, "en_US.utf8"); std::FILE* tmpf = std::tmpfile(); for (const wchar_t* text : { L"Ttradre" L"\n", L"Cube" L"\n", L"Octadre" L"\n", L"Icosadre" L"\n", L"Dodcadre" L"\n" }) if (int rc = std::fputws(text, tmpf); rc == EOF) { std::perror("fputws()"); // POSIX requires that errno is set return EXIT_FAILURE; } std::rewind(tmpf); std::array<wchar_t, 12> buf; while (std::fgetws(buf.data(), buf.size(), tmpf) != nullptr) dump(std::span(buf.data(), buf.size())); return EXIT_SUCCESS; } Possible output: Ttradre... 0054 00E9 0074 0072 0061 00E8 0064 0072 0065 000A 0000 0000 Cube..dre... 0043 0075 0062 0065 000A 0000 0064 0072 0065 000A 0000 0000 Octadre.... 004F 0063 0074 0061 00E8 0064 0072 0065 000A 0000 0000 0000 Icosadre... 0049 0063 006F 0073 0061 00E8 0064 0072 0065 000A 0000 0000 Dodcadre.. 0044 006F 0064 00E9 0063 0061 00E8 0064 0072 0065 000A 0000 See also wscanf reads formatted wide character input from stdin, a file stream or a buffer fwscanf (function) swscanf fgetwc gets a wide character from a file stream getwc (function) fputws writes a wide string to a file stream (function) C documentation for fgetws http://cppreference.com 2024.06.10 std::fgetws(3)
NAME | Synopsis | Parameters | Return value | Example | Possible output: | See also
Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=std::fgetws&sektion=3&manpath=FreeBSD+Ports+15.1.quarterly>