1  /* Copyright (C) 1991-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the License, or (at your option) any later version.
       8  
       9     The GNU C Library is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library; if not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <stdarg.h>
      19  #include <libio/libioP.h>
      20  
      21  
      22  /* Write formatted output from FORMAT to a string which is
      23     allocated with malloc and stored in *STRING_PTR.  */
      24  int
      25  ___asprintf_chk (char **result_ptr, int flag, const char *format, ...)
      26  {
      27    /* For flag > 0 (i.e. __USE_FORTIFY_LEVEL > 1) request that %n
      28       can only come from read-only format strings.  */
      29    unsigned int mode = (flag > 0) ? PRINTF_FORTIFY : 0;
      30    va_list ap;
      31    int ret;
      32  
      33    va_start (ap, format);
      34    ret = __vasprintf_internal (result_ptr, format, ap, mode);
      35    va_end (ap);
      36  
      37    return ret;
      38  }
      39  #if defined __LDBL_COMPAT || __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 1
      40  /* This is needed since <bits/stdio-lbdl.h> is included in this case, leading to
      41   * multiple asm redirection of the same symbol
      42   */
      43  ldbl_hidden_def (___asprintf_chk, __asprintf_chk)
      44  ldbl_strong_alias (___asprintf_chk, __asprintf_chk)
      45  #else
      46  /* On some systems introduction of ldbl_* macros lead to ABI breakage due to the
      47   * long_double_symbol aliasing, e.g. on s390x:
      48   * /usr/bin/ld: glibc/iconv/../libio/bits/stdio2.h:137: undefined reference to
      49   * `__asprintf_chk'
      50   * Due to __asprintf_chk@@GLIBC_2.4 alias replacing __asprintf_chk.
      51   */
      52  strong_alias (___asprintf_chk, __asprintf_chk)
      53  libc_hidden_def (__asprintf_chk)
      54  #endif