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-rw-r--r--libio/strops.c141
1 files changed, 84 insertions, 57 deletions
diff --git a/libio/strops.c b/libio/strops.c
index 0932d4c1b1..df8268b7ab 100644
--- a/libio/strops.c
+++ b/libio/strops.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1993-2016 Free Software Foundation, Inc.
+/* Copyright (C) 1993-2018 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
@@ -31,15 +31,15 @@
#include <stdio_ext.h>
void
-_IO_str_init_static_internal (_IO_strfile *sf, char *ptr, _IO_size_t size,
+_IO_str_init_static_internal (_IO_strfile *sf, char *ptr, size_t size,
char *pstart)
{
- _IO_FILE *fp = &sf->_sbf._f;
+ FILE *fp = &sf->_sbf._f;
char *end;
if (size == 0)
end = __rawmemchr (ptr, '\0');
- else if ((_IO_size_t) ptr + size > (_IO_size_t) ptr)
+ else if ((size_t) ptr + size > (size_t) ptr)
end = ptr + size;
else
end = (char *) -1;
@@ -61,7 +61,7 @@ _IO_str_init_static_internal (_IO_strfile *sf, char *ptr, _IO_size_t size,
fp->_IO_read_end = end;
}
/* A null _allocate_buffer function flags the strfile as being static. */
- sf->_s._allocate_buffer = (_IO_alloc_type) 0;
+ sf->_s._allocate_buffer_unused = (_IO_alloc_type) 0;
}
void
@@ -74,14 +74,14 @@ void
_IO_str_init_readonly (_IO_strfile *sf, const char *ptr, int size)
{
_IO_str_init_static_internal (sf, (char *) ptr, size < 0 ? -1 : size, NULL);
- sf->_sbf._f._IO_file_flags |= _IO_NO_WRITES;
+ sf->_sbf._f._flags |= _IO_NO_WRITES;
}
int
-_IO_str_overflow (_IO_FILE *fp, int c)
+_IO_str_overflow (FILE *fp, int c)
{
int flush_only = c == EOF;
- _IO_size_t pos;
+ size_t pos;
if (fp->_flags & _IO_NO_WRITES)
return flush_only ? 0 : EOF;
if ((fp->_flags & _IO_TIED_PUT_GET) && !(fp->_flags & _IO_CURRENTLY_PUTTING))
@@ -91,7 +91,7 @@ _IO_str_overflow (_IO_FILE *fp, int c)
fp->_IO_read_ptr = fp->_IO_read_end;
}
pos = fp->_IO_write_ptr - fp->_IO_write_base;
- if (pos >= (_IO_size_t) (_IO_blen (fp) + flush_only))
+ if (pos >= (size_t) (_IO_blen (fp) + flush_only))
{
if (fp->_flags & _IO_USER_BUF) /* not allowed to enlarge */
return EOF;
@@ -100,11 +100,10 @@ _IO_str_overflow (_IO_FILE *fp, int c)
char *new_buf;
char *old_buf = fp->_IO_buf_base;
size_t old_blen = _IO_blen (fp);
- _IO_size_t new_size = 2 * old_blen + 100;
+ size_t new_size = 2 * old_blen + 100;
if (new_size < old_blen)
return EOF;
- new_buf
- = (char *) (*((_IO_strfile *) fp)->_s._allocate_buffer) (new_size);
+ new_buf = malloc (new_size);
if (new_buf == NULL)
{
/* __ferror(fp) = 1; */
@@ -113,7 +112,7 @@ _IO_str_overflow (_IO_FILE *fp, int c)
if (old_buf)
{
memcpy (new_buf, old_buf, old_blen);
- (*((_IO_strfile *) fp)->_s._free_buffer) (old_buf);
+ free (old_buf);
/* Make sure _IO_setb won't try to delete _IO_buf_base. */
fp->_IO_buf_base = NULL;
}
@@ -139,7 +138,7 @@ _IO_str_overflow (_IO_FILE *fp, int c)
libc_hidden_def (_IO_str_overflow)
int
-_IO_str_underflow (_IO_FILE *fp)
+_IO_str_underflow (FILE *fp)
{
if (fp->_IO_write_ptr > fp->_IO_read_end)
fp->_IO_read_end = fp->_IO_write_ptr;
@@ -158,8 +157,8 @@ libc_hidden_def (_IO_str_underflow)
/* The size of the valid part of the buffer. */
-_IO_ssize_t
-_IO_str_count (_IO_FILE *fp)
+ssize_t
+_IO_str_count (FILE *fp)
{
return ((fp->_IO_write_ptr > fp->_IO_read_end
? fp->_IO_write_ptr : fp->_IO_read_end)
@@ -168,29 +167,28 @@ _IO_str_count (_IO_FILE *fp)
static int
-enlarge_userbuf (_IO_FILE *fp, _IO_off64_t offset, int reading)
+enlarge_userbuf (FILE *fp, off64_t offset, int reading)
{
- if ((_IO_ssize_t) offset <= _IO_blen (fp))
+ if ((ssize_t) offset <= _IO_blen (fp))
return 0;
- _IO_ssize_t oldend = fp->_IO_write_end - fp->_IO_write_base;
+ ssize_t oldend = fp->_IO_write_end - fp->_IO_write_base;
/* Try to enlarge the buffer. */
if (fp->_flags & _IO_USER_BUF)
/* User-provided buffer. */
return 1;
- _IO_size_t newsize = offset + 100;
+ size_t newsize = offset + 100;
char *oldbuf = fp->_IO_buf_base;
- char *newbuf
- = (char *) (*((_IO_strfile *) fp)->_s._allocate_buffer) (newsize);
+ char *newbuf = malloc (newsize);
if (newbuf == NULL)
return 1;
if (oldbuf != NULL)
{
memcpy (newbuf, oldbuf, _IO_blen (fp));
- (*((_IO_strfile *) fp)->_s._free_buffer) (oldbuf);
+ free (oldbuf);
/* Make sure _IO_setb won't try to delete
_IO_buf_base. */
fp->_IO_buf_base = NULL;
@@ -230,74 +228,103 @@ enlarge_userbuf (_IO_FILE *fp, _IO_off64_t offset, int reading)
return 0;
}
+static void
+_IO_str_switch_to_get_mode (FILE *fp)
+{
+ if (_IO_in_backup (fp))
+ fp->_IO_read_base = fp->_IO_backup_base;
+ else
+ {
+ fp->_IO_read_base = fp->_IO_buf_base;
+ if (fp->_IO_write_ptr > fp->_IO_read_end)
+ fp->_IO_read_end = fp->_IO_write_ptr;
+ }
+ fp->_IO_read_ptr = fp->_IO_read_end = fp->_IO_write_ptr;
-_IO_off64_t
-_IO_str_seekoff (_IO_FILE *fp, _IO_off64_t offset, int dir, int mode)
+ fp->_flags &= ~_IO_CURRENTLY_PUTTING;
+}
+
+off64_t
+_IO_str_seekoff (FILE *fp, off64_t offset, int dir, int mode)
{
- _IO_off64_t new_pos;
+ off64_t new_pos;
if (mode == 0 && (fp->_flags & _IO_TIED_PUT_GET))
mode = (fp->_flags & _IO_CURRENTLY_PUTTING ? _IOS_OUTPUT : _IOS_INPUT);
+ bool was_writing = (fp->_IO_write_ptr > fp->_IO_write_base
+ || _IO_in_put_mode (fp));
+ if (was_writing)
+ _IO_str_switch_to_get_mode (fp);
+
if (mode == 0)
{
- /* Don't move any pointers. But there is no clear indication what
- mode FP is in. Let's guess. */
- if (fp->_IO_file_flags & _IO_NO_WRITES)
- new_pos = fp->_IO_read_ptr - fp->_IO_read_base;
- else
- new_pos = fp->_IO_write_ptr - fp->_IO_write_base;
+ new_pos = fp->_IO_read_ptr - fp->_IO_read_base;
}
else
{
- _IO_ssize_t cur_size = _IO_str_count(fp);
+ ssize_t cur_size = _IO_str_count(fp);
new_pos = EOF;
/* Move the get pointer, if requested. */
if (mode & _IOS_INPUT)
{
+ ssize_t base;
switch (dir)
{
- case _IO_seek_end:
- offset += cur_size;
+ case _IO_seek_set:
+ base = 0;
break;
case _IO_seek_cur:
- offset += fp->_IO_read_ptr - fp->_IO_read_base;
+ base = fp->_IO_read_ptr - fp->_IO_read_base;
break;
- default: /* case _IO_seek_set: */
+ default: /* case _IO_seek_end: */
+ base = cur_size;
break;
}
- if (offset < 0)
- return EOF;
- if ((_IO_ssize_t) offset > cur_size
- && enlarge_userbuf (fp, offset, 1) != 0)
+ ssize_t maxval = SSIZE_MAX - base;
+ if (offset < -base || offset > maxval)
+ {
+ __set_errno (EINVAL);
+ return EOF;
+ }
+ base += offset;
+ if (base > cur_size
+ && enlarge_userbuf (fp, base, 1) != 0)
return EOF;
- fp->_IO_read_ptr = fp->_IO_read_base + offset;
+ fp->_IO_read_ptr = fp->_IO_read_base + base;
fp->_IO_read_end = fp->_IO_read_base + cur_size;
- new_pos = offset;
+ new_pos = base;
}
/* Move the put pointer, if requested. */
if (mode & _IOS_OUTPUT)
{
+ ssize_t base;
switch (dir)
{
- case _IO_seek_end:
- offset += cur_size;
+ case _IO_seek_set:
+ base = 0;
break;
case _IO_seek_cur:
- offset += fp->_IO_write_ptr - fp->_IO_write_base;
+ base = fp->_IO_write_ptr - fp->_IO_write_base;
break;
- default: /* case _IO_seek_set: */
+ default: /* case _IO_seek_end: */
+ base = cur_size;
break;
}
- if (offset < 0)
- return EOF;
- if ((_IO_ssize_t) offset > cur_size
- && enlarge_userbuf (fp, offset, 0) != 0)
+ ssize_t maxval = SSIZE_MAX - base;
+ if (offset < -base || offset > maxval)
+ {
+ __set_errno (EINVAL);
+ return EOF;
+ }
+ base += offset;
+ if (base > cur_size
+ && enlarge_userbuf (fp, base, 0) != 0)
return EOF;
- fp->_IO_write_ptr = fp->_IO_write_base + offset;
- new_pos = offset;
+ fp->_IO_write_ptr = fp->_IO_write_base + base;
+ new_pos = base;
}
}
return new_pos;
@@ -305,7 +332,7 @@ _IO_str_seekoff (_IO_FILE *fp, _IO_off64_t offset, int dir, int mode)
libc_hidden_def (_IO_str_seekoff)
int
-_IO_str_pbackfail (_IO_FILE *fp, int c)
+_IO_str_pbackfail (FILE *fp, int c)
{
if ((fp->_flags & _IO_NO_WRITES) && c != EOF)
return EOF;
@@ -314,16 +341,16 @@ _IO_str_pbackfail (_IO_FILE *fp, int c)
libc_hidden_def (_IO_str_pbackfail)
void
-_IO_str_finish (_IO_FILE *fp, int dummy)
+_IO_str_finish (FILE *fp, int dummy)
{
if (fp->_IO_buf_base && !(fp->_flags & _IO_USER_BUF))
- (((_IO_strfile *) fp)->_s._free_buffer) (fp->_IO_buf_base);
+ free (fp->_IO_buf_base);
fp->_IO_buf_base = NULL;
_IO_default_finish (fp, 0);
}
-const struct _IO_jump_t _IO_str_jumps =
+const struct _IO_jump_t _IO_str_jumps libio_vtable =
{
JUMP_INIT_DUMMY,
JUMP_INIT(finish, _IO_str_finish),