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7caa5054af
gets has the dubious honor of being the only C89 library feature that
has been completely removed from the current C and C++ standards.
glibc follows suit by not declaring it in _GNU_SOURCE mode either,
but it remains present in older compatibility modes. Internally,
two test cases need to see stdio.h make the declaration, but all our
internal code is of course compiled under _GNU_SOURCE. This is currently
kludged by duplicating the gets declaration, fortify wrapper and all,
in include/stdio.h. Also, the conditional in the public headers for
deciding when to declare gets is complicated and repeated in two places.
This patch adds a new macro to features.h that encapsulates the
complicated rule for when to declare gets. stdio.h and bits/stdio2.h
then simply test __GLIBC_USE (DEPRECATED_GETS), and instead of having
a duplicate gets declaration in include/stdio.h, debug/tst-chk1.c and
stdio-common/tst-gets.c can force gets to be declared.
* include/features.h (__GLIBC_USE_DEPRECATED_GETS): New macro.
* libio/stdio.h, libio/bits/stdio2.h: Condition gets on
__GLIBC_USE (DEPRECATED_GETS). Update comments to indicate
gets was removed from C++ in C++14.
* include/stdio.h: Remove redundant declaration of gets.
* debug/tst-chk1.c, stdio-common/tst-gets.c: Force gets to
be declared, since we are testing it.
* stdio-common/Makefile (tst-gets.c): Compile with
-Wno-deprecated-declarations.
* debug/Makefile (tst-chk1.c, tst-chk2.c, tst-chk3.c, tst-chk4.cc)
(tst-chk5.cc, tst-chk6.cc, tst-lfschk1.c, tst-lfschk2.c)
(tst-lfschk3.c, tst-lfschk4.cc, tst-lfschk5.cc, tst-lfschk6.cc):
Compile with -Wno-deprecated-declarations.
382 lines
12 KiB
C
382 lines
12 KiB
C
/* Checking macros for stdio functions.
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Copyright (C) 2004-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _STDIO_H
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# error "Never include <bits/stdio2.h> directly; use <stdio.h> instead."
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#endif
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extern int __sprintf_chk (char *__restrict __s, int __flag, size_t __slen,
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const char *__restrict __format, ...) __THROW;
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extern int __vsprintf_chk (char *__restrict __s, int __flag, size_t __slen,
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const char *__restrict __format,
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_G_va_list __ap) __THROW;
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#ifdef __va_arg_pack
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__fortify_function int
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__NTH (sprintf (char *__restrict __s, const char *__restrict __fmt, ...))
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{
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return __builtin___sprintf_chk (__s, __USE_FORTIFY_LEVEL - 1,
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__bos (__s), __fmt, __va_arg_pack ());
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}
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#elif !defined __cplusplus
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# define sprintf(str, ...) \
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__builtin___sprintf_chk (str, __USE_FORTIFY_LEVEL - 1, __bos (str), \
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__VA_ARGS__)
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#endif
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__fortify_function int
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__NTH (vsprintf (char *__restrict __s, const char *__restrict __fmt,
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_G_va_list __ap))
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{
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return __builtin___vsprintf_chk (__s, __USE_FORTIFY_LEVEL - 1,
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__bos (__s), __fmt, __ap);
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}
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#if defined __USE_ISOC99 || defined __USE_UNIX98
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extern int __snprintf_chk (char *__restrict __s, size_t __n, int __flag,
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size_t __slen, const char *__restrict __format,
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...) __THROW;
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extern int __vsnprintf_chk (char *__restrict __s, size_t __n, int __flag,
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size_t __slen, const char *__restrict __format,
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_G_va_list __ap) __THROW;
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# ifdef __va_arg_pack
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__fortify_function int
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__NTH (snprintf (char *__restrict __s, size_t __n,
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const char *__restrict __fmt, ...))
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{
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return __builtin___snprintf_chk (__s, __n, __USE_FORTIFY_LEVEL - 1,
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__bos (__s), __fmt, __va_arg_pack ());
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}
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# elif !defined __cplusplus
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# define snprintf(str, len, ...) \
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__builtin___snprintf_chk (str, len, __USE_FORTIFY_LEVEL - 1, __bos (str), \
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__VA_ARGS__)
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# endif
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__fortify_function int
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__NTH (vsnprintf (char *__restrict __s, size_t __n,
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const char *__restrict __fmt, _G_va_list __ap))
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{
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return __builtin___vsnprintf_chk (__s, __n, __USE_FORTIFY_LEVEL - 1,
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__bos (__s), __fmt, __ap);
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}
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#endif
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#if __USE_FORTIFY_LEVEL > 1
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extern int __fprintf_chk (FILE *__restrict __stream, int __flag,
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const char *__restrict __format, ...);
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extern int __printf_chk (int __flag, const char *__restrict __format, ...);
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extern int __vfprintf_chk (FILE *__restrict __stream, int __flag,
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const char *__restrict __format, _G_va_list __ap);
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extern int __vprintf_chk (int __flag, const char *__restrict __format,
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_G_va_list __ap);
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# ifdef __va_arg_pack
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__fortify_function int
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fprintf (FILE *__restrict __stream, const char *__restrict __fmt, ...)
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{
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return __fprintf_chk (__stream, __USE_FORTIFY_LEVEL - 1, __fmt,
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__va_arg_pack ());
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}
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__fortify_function int
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printf (const char *__restrict __fmt, ...)
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{
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return __printf_chk (__USE_FORTIFY_LEVEL - 1, __fmt, __va_arg_pack ());
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}
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# elif !defined __cplusplus
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# define printf(...) \
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__printf_chk (__USE_FORTIFY_LEVEL - 1, __VA_ARGS__)
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# define fprintf(stream, ...) \
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__fprintf_chk (stream, __USE_FORTIFY_LEVEL - 1, __VA_ARGS__)
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# endif
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__fortify_function int
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vprintf (const char *__restrict __fmt, _G_va_list __ap)
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{
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#ifdef __USE_EXTERN_INLINES
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return __vfprintf_chk (stdout, __USE_FORTIFY_LEVEL - 1, __fmt, __ap);
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#else
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return __vprintf_chk (__USE_FORTIFY_LEVEL - 1, __fmt, __ap);
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#endif
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}
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__fortify_function int
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vfprintf (FILE *__restrict __stream,
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const char *__restrict __fmt, _G_va_list __ap)
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{
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return __vfprintf_chk (__stream, __USE_FORTIFY_LEVEL - 1, __fmt, __ap);
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}
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# ifdef __USE_XOPEN2K8
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extern int __dprintf_chk (int __fd, int __flag, const char *__restrict __fmt,
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...) __attribute__ ((__format__ (__printf__, 3, 4)));
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extern int __vdprintf_chk (int __fd, int __flag,
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const char *__restrict __fmt, _G_va_list __arg)
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__attribute__ ((__format__ (__printf__, 3, 0)));
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# ifdef __va_arg_pack
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__fortify_function int
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dprintf (int __fd, const char *__restrict __fmt, ...)
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{
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return __dprintf_chk (__fd, __USE_FORTIFY_LEVEL - 1, __fmt,
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__va_arg_pack ());
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}
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# elif !defined __cplusplus
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# define dprintf(fd, ...) \
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__dprintf_chk (fd, __USE_FORTIFY_LEVEL - 1, __VA_ARGS__)
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# endif
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__fortify_function int
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vdprintf (int __fd, const char *__restrict __fmt, _G_va_list __ap)
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{
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return __vdprintf_chk (__fd, __USE_FORTIFY_LEVEL - 1, __fmt, __ap);
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}
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# endif
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# ifdef __USE_GNU
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extern int __asprintf_chk (char **__restrict __ptr, int __flag,
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const char *__restrict __fmt, ...)
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__THROW __attribute__ ((__format__ (__printf__, 3, 4))) __wur;
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extern int __vasprintf_chk (char **__restrict __ptr, int __flag,
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const char *__restrict __fmt, _G_va_list __arg)
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__THROW __attribute__ ((__format__ (__printf__, 3, 0))) __wur;
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extern int __obstack_printf_chk (struct obstack *__restrict __obstack,
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int __flag, const char *__restrict __format,
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...)
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__THROW __attribute__ ((__format__ (__printf__, 3, 4)));
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extern int __obstack_vprintf_chk (struct obstack *__restrict __obstack,
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int __flag,
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const char *__restrict __format,
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_G_va_list __args)
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__THROW __attribute__ ((__format__ (__printf__, 3, 0)));
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# ifdef __va_arg_pack
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__fortify_function int
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__NTH (asprintf (char **__restrict __ptr, const char *__restrict __fmt, ...))
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{
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return __asprintf_chk (__ptr, __USE_FORTIFY_LEVEL - 1, __fmt,
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__va_arg_pack ());
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}
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__fortify_function int
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__NTH (__asprintf (char **__restrict __ptr, const char *__restrict __fmt,
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...))
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{
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return __asprintf_chk (__ptr, __USE_FORTIFY_LEVEL - 1, __fmt,
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__va_arg_pack ());
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}
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__fortify_function int
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__NTH (obstack_printf (struct obstack *__restrict __obstack,
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const char *__restrict __fmt, ...))
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{
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return __obstack_printf_chk (__obstack, __USE_FORTIFY_LEVEL - 1, __fmt,
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__va_arg_pack ());
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}
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# elif !defined __cplusplus
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# define asprintf(ptr, ...) \
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__asprintf_chk (ptr, __USE_FORTIFY_LEVEL - 1, __VA_ARGS__)
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# define __asprintf(ptr, ...) \
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__asprintf_chk (ptr, __USE_FORTIFY_LEVEL - 1, __VA_ARGS__)
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# define obstack_printf(obstack, ...) \
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__obstack_printf_chk (obstack, __USE_FORTIFY_LEVEL - 1, __VA_ARGS__)
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# endif
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__fortify_function int
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__NTH (vasprintf (char **__restrict __ptr, const char *__restrict __fmt,
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_G_va_list __ap))
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{
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return __vasprintf_chk (__ptr, __USE_FORTIFY_LEVEL - 1, __fmt, __ap);
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}
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__fortify_function int
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__NTH (obstack_vprintf (struct obstack *__restrict __obstack,
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const char *__restrict __fmt, _G_va_list __ap))
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{
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return __obstack_vprintf_chk (__obstack, __USE_FORTIFY_LEVEL - 1, __fmt,
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__ap);
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}
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# endif
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#endif
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#if __GLIBC_USE (DEPRECATED_GETS)
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extern char *__gets_chk (char *__str, size_t) __wur;
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extern char *__REDIRECT (__gets_warn, (char *__str), gets)
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__wur __warnattr ("please use fgets or getline instead, gets can't "
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"specify buffer size");
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__fortify_function __wur char *
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gets (char *__str)
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{
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if (__bos (__str) != (size_t) -1)
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return __gets_chk (__str, __bos (__str));
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return __gets_warn (__str);
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}
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#endif
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extern char *__fgets_chk (char *__restrict __s, size_t __size, int __n,
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FILE *__restrict __stream) __wur;
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extern char *__REDIRECT (__fgets_alias,
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(char *__restrict __s, int __n,
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FILE *__restrict __stream), fgets) __wur;
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extern char *__REDIRECT (__fgets_chk_warn,
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(char *__restrict __s, size_t __size, int __n,
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FILE *__restrict __stream), __fgets_chk)
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__wur __warnattr ("fgets called with bigger size than length "
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"of destination buffer");
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__fortify_function __wur char *
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fgets (char *__restrict __s, int __n, FILE *__restrict __stream)
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{
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if (__bos (__s) != (size_t) -1)
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{
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if (!__builtin_constant_p (__n) || __n <= 0)
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return __fgets_chk (__s, __bos (__s), __n, __stream);
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if ((size_t) __n > __bos (__s))
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return __fgets_chk_warn (__s, __bos (__s), __n, __stream);
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}
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return __fgets_alias (__s, __n, __stream);
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}
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extern size_t __fread_chk (void *__restrict __ptr, size_t __ptrlen,
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size_t __size, size_t __n,
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FILE *__restrict __stream) __wur;
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extern size_t __REDIRECT (__fread_alias,
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(void *__restrict __ptr, size_t __size,
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size_t __n, FILE *__restrict __stream),
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fread) __wur;
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extern size_t __REDIRECT (__fread_chk_warn,
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(void *__restrict __ptr, size_t __ptrlen,
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size_t __size, size_t __n,
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FILE *__restrict __stream),
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__fread_chk)
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__wur __warnattr ("fread called with bigger size * nmemb than length "
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"of destination buffer");
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__fortify_function __wur size_t
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fread (void *__restrict __ptr, size_t __size, size_t __n,
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FILE *__restrict __stream)
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{
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if (__bos0 (__ptr) != (size_t) -1)
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{
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if (!__builtin_constant_p (__size)
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|| !__builtin_constant_p (__n)
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|| (__size | __n) >= (((size_t) 1) << (8 * sizeof (size_t) / 2)))
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return __fread_chk (__ptr, __bos0 (__ptr), __size, __n, __stream);
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if (__size * __n > __bos0 (__ptr))
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return __fread_chk_warn (__ptr, __bos0 (__ptr), __size, __n, __stream);
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}
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return __fread_alias (__ptr, __size, __n, __stream);
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}
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#ifdef __USE_GNU
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extern char *__fgets_unlocked_chk (char *__restrict __s, size_t __size,
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int __n, FILE *__restrict __stream) __wur;
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extern char *__REDIRECT (__fgets_unlocked_alias,
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(char *__restrict __s, int __n,
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FILE *__restrict __stream), fgets_unlocked) __wur;
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extern char *__REDIRECT (__fgets_unlocked_chk_warn,
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(char *__restrict __s, size_t __size, int __n,
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FILE *__restrict __stream), __fgets_unlocked_chk)
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__wur __warnattr ("fgets_unlocked called with bigger size than length "
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"of destination buffer");
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__fortify_function __wur char *
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fgets_unlocked (char *__restrict __s, int __n, FILE *__restrict __stream)
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{
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if (__bos (__s) != (size_t) -1)
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{
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if (!__builtin_constant_p (__n) || __n <= 0)
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return __fgets_unlocked_chk (__s, __bos (__s), __n, __stream);
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if ((size_t) __n > __bos (__s))
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return __fgets_unlocked_chk_warn (__s, __bos (__s), __n, __stream);
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}
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return __fgets_unlocked_alias (__s, __n, __stream);
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}
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#endif
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#ifdef __USE_MISC
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# undef fread_unlocked
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extern size_t __fread_unlocked_chk (void *__restrict __ptr, size_t __ptrlen,
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size_t __size, size_t __n,
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FILE *__restrict __stream) __wur;
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extern size_t __REDIRECT (__fread_unlocked_alias,
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(void *__restrict __ptr, size_t __size,
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size_t __n, FILE *__restrict __stream),
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fread_unlocked) __wur;
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extern size_t __REDIRECT (__fread_unlocked_chk_warn,
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(void *__restrict __ptr, size_t __ptrlen,
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size_t __size, size_t __n,
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FILE *__restrict __stream),
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__fread_unlocked_chk)
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__wur __warnattr ("fread_unlocked called with bigger size * nmemb than "
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"length of destination buffer");
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__fortify_function __wur size_t
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fread_unlocked (void *__restrict __ptr, size_t __size, size_t __n,
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FILE *__restrict __stream)
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{
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if (__bos0 (__ptr) != (size_t) -1)
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{
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if (!__builtin_constant_p (__size)
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|| !__builtin_constant_p (__n)
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|| (__size | __n) >= (((size_t) 1) << (8 * sizeof (size_t) / 2)))
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return __fread_unlocked_chk (__ptr, __bos0 (__ptr), __size, __n,
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__stream);
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if (__size * __n > __bos0 (__ptr))
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return __fread_unlocked_chk_warn (__ptr, __bos0 (__ptr), __size, __n,
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__stream);
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}
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# ifdef __USE_EXTERN_INLINES
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if (__builtin_constant_p (__size)
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&& __builtin_constant_p (__n)
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&& (__size | __n) < (((size_t) 1) << (8 * sizeof (size_t) / 2))
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&& __size * __n <= 8)
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{
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size_t __cnt = __size * __n;
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char *__cptr = (char *) __ptr;
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if (__cnt == 0)
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return 0;
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for (; __cnt > 0; --__cnt)
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{
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int __c = _IO_getc_unlocked (__stream);
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if (__c == EOF)
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break;
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*__cptr++ = __c;
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}
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return (__cptr - (char *) __ptr) / __size;
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}
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# endif
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return __fread_unlocked_alias (__ptr, __size, __n, __stream);
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}
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#endif
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