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glibc  2.9
Classes | Functions
obprintf_chk.c File Reference
#include <stdlib.h>
#include <libioP.h>
#include "../libio/strfile.h"
#include <assert.h>
#include <string.h>
#include <errno.h>
#include <obstack.h>
#include <stdarg.h>
#include <stdio_ext.h>

Go to the source code of this file.


struct  _IO_obstack_file


int __obstack_vprintf_chk (struct obstack *obstack, int flags, const char *format, va_list args)
 libc_hidden_def (__obstack_vprintf_chk)

Class Documentation

struct _IO_obstack_file

Definition at line 34 of file obprintf_chk.c.

Collaboration diagram for _IO_obstack_file:
Class Members
struct obstack * obstack

Function Documentation

int __obstack_vprintf_chk ( struct obstack obstack,
int  flags,
const char *  format,
va_list  args 

Definition at line 43 of file obprintf_chk.c.

  struct obstack_FILE
      struct _IO_obstack_file ofile;
    } new_f;
  int result;
  int size;
  int room;

#ifdef _IO_MTSAFE_IO
  new_f.ofile.file.file._lock = NULL;

  _IO_no_init (&new_f.ofile.file.file, _IO_USER_LOCK, -1, NULL, NULL);
  _IO_JUMPS (&new_f.ofile.file) = &_IO_obstack_jumps;
  room = obstack_room (obstack);
  size = obstack_object_size (obstack) + room;
  if (size == 0)
      /* We have to handle the allocation a bit different since the
        `_IO_str_init_static' function would handle a size of zero
        different from what we expect.  */

      /* Get more memory.  */
      obstack_make_room (obstack, 64);

      /* Recompute how much room we have.  */
      room = obstack_room (obstack);
      size = room;

      assert (size != 0);

  _IO_str_init_static_internal ((struct _IO_strfile_ *) &new_f.ofile,
                            obstack_base (obstack),
                            size, obstack_next_free (obstack));
  /* Now allocate the rest of the current chunk.  */
  assert (size == (new_f.ofile.file.file._IO_write_end
                 - new_f.ofile.file.file._IO_write_base));
  assert (new_f.ofile.file.file._IO_write_ptr
         == (new_f.ofile.file.file._IO_write_base
             + obstack_object_size (obstack)));
  obstack_blank_fast (obstack, room);

  new_f.ofile.obstack = obstack;

  /* For flags > 0 (i.e. __USE_FORTIFY_LEVEL > 1) request that %n
     can only come from read-only format strings.  */
  if (flags > 0)
    new_f.ofile.file.file._flags2 |= _IO_FLAGS2_FORTIFY;

  result = INTUSE(_IO_vfprintf) (&new_f.ofile.file.file, format, args);

  /* Shrink the buffer to the space we really currently need.  */
  obstack_blank_fast (obstack, (new_f.ofile.file.file._IO_write_ptr
                            - new_f.ofile.file.file._IO_write_end));

  return result;

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Definition at line 104 of file obprintf_chk.c.

  int result;
  va_list ap;
  va_start (ap, format);
  result = __obstack_vprintf_chk (obstack, flags, format, ap);
  va_end (ap);
  return result;

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