168 lines
5.9 KiB
C
168 lines
5.9 KiB
C
/* POSIX compatible FILE stream read function.
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Copyright (C) 2008-2022 Free Software Foundation, Inc.
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Written by Bruno Haible <bruno@clisp.org>, 2011.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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This file is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#include <config.h>
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/* Specification. */
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#include <stdio.h>
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/* Replace these functions only if module 'nonblocking' is requested. */
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#if GNULIB_NONBLOCKING
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/* On native Windows platforms, when read() is called on a non-blocking pipe
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with an empty buffer, ReadFile() fails with error GetLastError() =
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ERROR_NO_DATA, and read() in consequence fails with error EINVAL. This
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read() function is at the basis of the function which fills the buffer of
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a FILE stream. */
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# if defined _WIN32 && ! defined __CYGWIN__
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# include <errno.h>
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# include <io.h>
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# define WIN32_LEAN_AND_MEAN /* avoid including junk */
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# include <windows.h>
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# if GNULIB_MSVC_NOTHROW
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# include "msvc-nothrow.h"
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# else
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# include <io.h>
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# endif
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/* Don't assume that UNICODE is not defined. */
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# undef GetNamedPipeHandleState
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# define GetNamedPipeHandleState GetNamedPipeHandleStateA
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# define CALL_WITH_ERRNO_FIX(RETTYPE, EXPRESSION, FAILED) \
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if (ferror (stream)) \
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return (EXPRESSION); \
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else \
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{ \
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RETTYPE ret; \
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SetLastError (0); \
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ret = (EXPRESSION); \
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if (FAILED) \
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{ \
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if (GetLastError () == ERROR_NO_DATA && ferror (stream)) \
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{ \
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int fd = fileno (stream); \
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if (fd >= 0) \
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{ \
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HANDLE h = (HANDLE) _get_osfhandle (fd); \
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if (GetFileType (h) == FILE_TYPE_PIPE) \
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{ \
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/* h is a pipe or socket. */ \
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DWORD state; \
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if (GetNamedPipeHandleState (h, &state, NULL, NULL, \
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NULL, NULL, 0) \
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&& (state & PIPE_NOWAIT) != 0) \
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/* h is a pipe in non-blocking mode. \
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Change errno from EINVAL to EAGAIN. */ \
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errno = EAGAIN; \
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} \
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} \
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} \
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} \
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return ret; \
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}
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/* Enable this function definition only if gnulib's <stdio.h> has prepared it.
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Otherwise we get a function definition conflict with mingw64's <stdio.h>. */
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# if GNULIB_SCANF
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int
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scanf (const char *format, ...)
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{
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int retval;
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va_list args;
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va_start (args, format);
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retval = vfscanf (stdin, format, args);
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va_end (args);
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return retval;
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}
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# endif
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/* Enable this function definition only if gnulib's <stdio.h> has prepared it.
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Otherwise we get a function definition conflict with mingw64's <stdio.h>. */
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# if GNULIB_FSCANF
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int
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fscanf (FILE *stream, const char *format, ...)
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{
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int retval;
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va_list args;
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va_start (args, format);
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retval = vfscanf (stream, format, args);
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va_end (args);
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return retval;
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}
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# endif
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/* Enable this function definition only if gnulib's <stdio.h> has prepared it.
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Otherwise we get a function definition conflict with mingw64's <stdio.h>. */
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# if GNULIB_VSCANF
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int
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vscanf (const char *format, va_list args)
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{
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return vfscanf (stdin, format, args);
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}
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# endif
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/* Enable this function definition only if gnulib's <stdio.h> has prepared it.
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Otherwise we get a function definition conflict with mingw64's <stdio.h>. */
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# if GNULIB_VFSCANF
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int
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vfscanf (FILE *stream, const char *format, va_list args)
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#undef vfscanf
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{
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CALL_WITH_ERRNO_FIX (int, vfscanf (stream, format, args), ret == EOF)
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}
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# endif
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int
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getchar (void)
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{
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return fgetc (stdin);
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}
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int
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fgetc (FILE *stream)
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#undef fgetc
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{
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CALL_WITH_ERRNO_FIX (int, fgetc (stream), ret == EOF)
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}
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char *
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fgets (char *s, int n, FILE *stream)
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#undef fgets
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{
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CALL_WITH_ERRNO_FIX (char *, fgets (s, n, stream), ret == NULL)
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}
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/* We intentionally don't bother to fix gets. */
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size_t
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fread (void *ptr, size_t s, size_t n, FILE *stream)
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#undef fread
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{
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CALL_WITH_ERRNO_FIX (size_t, fread (ptr, s, n, stream), ret < n)
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}
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# endif
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#endif
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