libio: Remove __libc_readline_unlocked

__nss_readline supersedes it.  This reverts part of commit
3f5e3f5d066dcffb80af48ae2cf35a01a85a8f10 ("libio: Implement
internal function __libc_readline_unlocked").  The internal
aliases __fseeko64 and __ftello64 are preserved because
they are needed by __nss_readline as well.

Tested-by: Carlos O'Donell <carlos@redhat.com>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>

1 files changed, 0 insertions, 170 deletions

diff --git a/libio/readline.c b/libio/readline.c
deleted file mode 100644
index 99fecc5825..0000000000
--- a/libio/readline.c
+++ /dev/null
@@ -1,170 +0,0 @@
-/* fgets with ERANGE error reporting and size_t buffer length.
-   Copyright (C) 2018-2020 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   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.
-
-   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
-   Lesser General Public License for more details.
-
-   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/>.  */
-
-#include <assert.h>
-#include <errno.h>
-#include <stdio.h>
-#include <string.h>
-
-#include "libioP.h"
-
-/* Return -1 and set errno to EINVAL if it is ERANGE.  */
-static ssize_t
-fail_no_erange (void)
-{
-  if (errno == ERANGE)
-    __set_errno (EINVAL);
-  return -1;
-}
-
-/* Slow path for reading the line.  Called with no data in the stream
-   read buffer.  Write data to [BUFFER, BUFFER_END).  */
-static ssize_t
-readline_slow (FILE *fp, char *buffer, char *buffer_end)
-{
-  char *start = buffer;
-
-  while (buffer < buffer_end)
-    {
-      if (__underflow (fp) == EOF)
-        {
-          if (_IO_ferror_unlocked (fp))
-            /* If the EOF was caused by a read error, report it.  */
-            return fail_no_erange ();
-          *buffer = '\0';
-          /* Do not include the null terminator.  */
-          return buffer - start;
-        }
-
-      /* __underflow has filled the buffer.  */
-      char *readptr = fp->_IO_read_ptr;
-      ssize_t readlen = fp->_IO_read_end - readptr;
-      /* Make sure that __underflow really has acquired some data.  */
-      assert (readlen > 0);
-      char *pnl = memchr (readptr, '\n', readlen);
-      if (pnl != NULL)
-        {
-          /* We found the terminator.  */
-          size_t line_length = pnl - readptr;
-          if (line_length + 2 > buffer_end - buffer)
-            /* Not enough room in the caller-supplied buffer.  */
-            break;
-          memcpy (buffer, readptr, line_length + 1);
-          buffer[line_length + 1] = '\0';
-          fp->_IO_read_ptr = pnl + 1;
-          /* Do not include the null terminator.  */
-          return buffer - start + line_length + 1;
-        }
-
-      if (readlen >= buffer_end - buffer)
-        /* Not enough room in the caller-supplied buffer.  */
-        break;
-
-      /* Save and consume the stream buffer.  */
-      memcpy (buffer, readptr, readlen);
-      fp->_IO_read_ptr = fp->_IO_read_end;
-      buffer += readlen;
-    }
-
-  /* The line does not fit into the buffer.  */
-  __set_errno (ERANGE);
-  return -1;
-}
-
-ssize_t
-__libc_readline_unlocked (FILE *fp, char *buffer, size_t buffer_length)
-{
-  char *buffer_end = buffer + buffer_length;
-
-  /* Orient the stream.  */
-  if (__builtin_expect (fp->_mode, -1) == 0)
-    _IO_fwide (fp, -1);
-
-  /* Fast path: The line terminator is found in the buffer.  */
-  char *readptr = fp->_IO_read_ptr;
-  ssize_t readlen = fp->_IO_read_end - readptr;
-  off64_t start_offset;         /* File offset before reading anything.  */
-  if (readlen > 0)
-    {
-      char *pnl = memchr (readptr, '\n', readlen);
-      if (pnl != NULL)
-        {
-          size_t line_length = pnl - readptr;
-          /* Account for line and null terminators.  */
-          if (line_length + 2 > buffer_length)
-            {
-              __set_errno (ERANGE);
-              return -1;
-            }
-          memcpy (buffer, readptr, line_length + 1);
-          buffer[line_length + 1] = '\0';
-          /* Consume the entire line.  */
-          fp->_IO_read_ptr = pnl + 1;
-          return line_length + 1;
-        }
-
-      /* If the buffer does not have enough space for what is pending
-         in the stream (plus a NUL terminator), the buffer is too
-         small.  */
-      if (readlen + 1 > buffer_length)
-        {
-          __set_errno (ERANGE);
-          return -1;
-        }
-
-      /* End of line not found.  We need all the buffered data.  Fall
-         through to the slow path.  */
-      memcpy (buffer, readptr, readlen);
-      buffer += readlen;
-      /* The original length is invalid after this point.  Use
-         buffer_end instead.  */
-#pragma GCC poison buffer_length
-      /* Read the old offset before updating the read pointer.  */
-      start_offset = __ftello64 (fp);
-      fp->_IO_read_ptr = fp->_IO_read_end;
-    }
-  else
-    {
-      readlen = 0;
-      start_offset = __ftello64 (fp);
-    }
-
-  /* Slow path: Read more data from the underlying file.  We need to
-     restore the file pointer if the buffer is too small.  First,
-     check if the __ftello64 call above failed.  */
-  if (start_offset < 0)
-    return fail_no_erange ();
-
-  ssize_t result = readline_slow (fp, buffer, buffer_end);
-  if (result < 0)
-    {
-      if (errno == ERANGE)
-        {
-          /* Restore the file pointer so that the caller may read the
-             same line again.  */
-          if (__fseeko64 (fp, start_offset, SEEK_SET) < 0)
-            return fail_no_erange ();
-          __set_errno (ERANGE);
-        }
-      /* Do not restore the file position on other errors; it is
-         likely that the __fseeko64 call would fail, too.  */
-      return -1;
-    }
-  return readlen + result;
-}
-libc_hidden_def (__libc_readline_unlocked)