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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.
15static 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
41extern "C" int __cdecl puts(char const* const string)
42{
43 __crt_cached_ptd_host ptd;
44 return _puts_internal(string, ptd);
45}