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sortix--sortix/libc/stdio/fgets_unlocked.cpp
Jonas 'Sortie' Termansen 1ddd404ff9 Thread-secure stdio.
2014-07-08 17:41:52 +02:00

52 lines
1.6 KiB
C++

/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2014.
This file is part of the Sortix C Library.
The Sortix C Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
The Sortix C Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
stdio/fgets_unlocked.cpp
Reads a string from a FILE.
*******************************************************************************/
#include <stdio.h>
#include <errno.h>
extern "C"
char* fgets_unlocked(char* restrict dest, int size, FILE* restrict fp)
{
if ( size <= 0 )
return errno = EINVAL, (char*) NULL;
int i;
for ( i = 0; i < size-1; i++ )
{
int c = fgetc_unlocked(fp);
if ( c == EOF )
break;
dest[i] = c;
if ( c == '\n' )
{
i++;
break;
}
}
if ( !i && (ferror_unlocked(fp) || feof_unlocked(fp)) )
return NULL;
// TODO: The end-of-file state is lost here if feof(fp) and we are reading
// from a terminal that encountered a soft EOF.
dest[i] = '\0';
return dest;
}