1 // 2 // puts.cpp 3 // 4 // Copyright (c) Microsoft Corporation. All rights reserved. 5 // 6 // Defines puts(), which writes a string to stdout. 7 // 8 #include <corecrt_internal_stdio.h> 9 #include <corecrt_internal_ptd_propagation.h> 10 11 12 13 // Writes a string to stdout. Does not write the string's null terminator, but 14 // _does_ append a newline to the output. Return 0 on success; EOF on failure. 15 static int __cdecl _puts_internal(char const* const string, __crt_cached_ptd_host& ptd) 16 { 17 _UCRT_VALIDATE_RETURN(ptd, string != nullptr, EINVAL, EOF); 18 19 FILE* const stream = stdout; 20 _UCRT_VALIDATE_STREAM_ANSI_RETURN(ptd, stream, EINVAL, EOF); 21 22 size_t const length = strlen(string); 23 24 return __acrt_lock_stream_and_call(stream, [&]() -> int 25 { 26 __acrt_stdio_temporary_buffering_guard const buffering(stream, ptd); 27 28 size_t const bytes_written = _fwrite_nolock_internal(string, 1, length, stream, ptd); 29 30 // If we failed to write the entire string, or if we fail to write the 31 // newline, reset the buffering and return failure: 32 if (bytes_written != length || _fputc_nolock_internal('\n', stream, ptd) == EOF) 33 { 34 return EOF; 35 } 36 37 return 0; 38 }); 39 } 40 41 extern "C" int __cdecl puts(char const* const string) 42 { 43 __crt_cached_ptd_host ptd; 44 return _puts_internal(string, ptd); 45 } 46