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[thirdparty/glibc.git] / libio / iofgets.c

diff --git a/libio/iofgets.c b/libio/iofgets.c
index 91db09f342635f7487905a21b71c23b687b81397..d57e42c0911acf0717c4a952e8c66cad34e633ec 100644 (file)
--- a/libio/iofgets.c
+++ b/libio/iofgets.c
@@ -1,63 +1,75 @@
-/* Copyright (C) 1993, 1995, 1996, 1997 Free Software Foundation, Inc.
-   This file is part of the GNU IO Library.
+/* Copyright (C) 1993-2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
 
-   This library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU General Public License as
-   published by the Free Software Foundation; either version 2, or (at
-   your option) any later version.
+   The GNU 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 2.1 of the License, or (at your option) any later version.
 
-   This library is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
+   The GNU 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
-   General Public License for more details.
+   Lesser General Public License for more details.
 
-   You should have received a copy of the GNU General Public License
-   along with this library; see the file COPYING.  If not, write to
-   the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
-   MA 02111-1307, USA.
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.
 
-   As a special exception, if you link this library with files
-   compiled with a GNU compiler to produce an executable, this does
-   not cause the resulting executable to be covered by the GNU General
-   Public License.  This exception does not however invalidate any
-   other reasons why the executable file might be covered by the GNU
-   General Public License.  */
+   As a special exception, if you link the code in this file with
+   files compiled with a GNU compiler to produce an executable,
+   that does not cause the resulting executable to be covered by
+   the GNU Lesser General Public License.  This exception does not
+   however invalidate any other reasons why the executable file
+   might be covered by the GNU Lesser General Public License.
+   This exception applies to code released by its copyright holders
+   in files containing the exception.  */
 
 #include "libioP.h"
 #include <stdio.h>
 
 char *
-_IO_fgets (buf, n, fp)
-     char *buf;
-     int n;
-     _IO_FILE *fp;
+_IO_fgets (char *buf, int n, FILE *fp)
 {
-  _IO_size_t count;
+  size_t count;
   char *result;
   int old_error;
   CHECK_FILE (fp, NULL);
   if (n <= 0)
     return NULL;
-  _IO_cleanup_region_start ((void (*) __P ((void *))) _IO_funlockfile, fp);
-  _IO_flockfile (fp);
+  if (__glibc_unlikely (n == 1))
+    {
+      /* Another irregular case: since we have to store a NUL byte and
+        there is only room for exactly one byte, we don't have to
+        read anything.  */
+      buf[0] = '\0';
+      return buf;
+    }
+  _IO_acquire_lock (fp);
   /* This is very tricky since a file descriptor may be in the
      non-blocking mode. The error flag doesn't mean much in this
      case. We return an error only when there is a new error. */
-  old_error = fp->_IO_file_flags & _IO_ERR_SEEN;
-  fp->_IO_file_flags &= ~_IO_ERR_SEEN;
+  old_error = fp->_flags & _IO_ERR_SEEN;
+  fp->_flags &= ~_IO_ERR_SEEN;
   count = _IO_getline (fp, buf, n - 1, '\n', 1);
-  if (count == 0 || (fp->_IO_file_flags & _IO_ERR_SEEN))
+  /* If we read in some bytes and errno is EAGAIN, that error will
+     be reported for next read. */
+  if (count == 0 || ((fp->_flags & _IO_ERR_SEEN) && errno != EAGAIN))
     result = NULL;
   else
     {
       buf[count] = '\0';
       result = buf;
     }
-  fp->_IO_file_flags |= old_error;
-  _IO_cleanup_region_end (1);
+  fp->_flags |= old_error;
+  _IO_release_lock (fp);
   return result;
 }
 
-#ifdef weak_alias
 weak_alias (_IO_fgets, fgets)
-#endif
+
+# ifndef _IO_MTSAFE_IO
+strong_alias (_IO_fgets, __fgets_unlocked)
+libc_hidden_def (__fgets_unlocked)
+weak_alias (_IO_fgets, fgets_unlocked)
+libc_hidden_weak (fgets_unlocked)
+# endif