libio/obprintf.c

   1 /* Print output of stream to given obstack.
   2    Copyright (C) 1996, 1997 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Library General Public License as
   8    published by the Free Software Foundation; either version 2 of the
   9    License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Library General Public License for more details.
  15
  16    You should have received a copy of the GNU Library General Public
  17    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  18    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21
  22 #ifdef __STDC__
  23 #include <stdlib.h>
  24 #endif
  25 #include "libioP.h"
  26 #include <string.h>
  27 #include <errno.h>
  28 #include <obstack.h>
  29 #include <stdarg.h>
  30
  31
  32 struct _IO_obstack_file
  33 {
  34   struct _IO_FILE file;
  35   const void *vtable;
  36   struct obstack *obstack;
  37 };
  38
  39
  40 static int
  41 _IO_obstack_overflow (_IO_FILE *fp, int c)
  42 {
  43   struct obstack *obstack = ((struct _IO_obstack_file *) fp)->obstack;
  44
  45   /* Make room for another character.  This might as well allocate a
  46      new chunk a memory and moves the old contents over.  */
  47   if (c != EOF)
  48     obstack_1grow (obstack, c);
  49
  50   /* Setup the buffer pointers again.  */
  51   fp->_IO_write_base = obstack_base (obstack);
  52   fp->_IO_write_ptr = obstack_next_free (obstack);
  53   fp->_IO_write_end = fp->_IO_write_base + obstack_room (obstack);
  54   /* Now allocate the rest of the current chunk.  */
  55   obstack_blank_fast (obstack, fp->_IO_write_end - fp->_IO_write_ptr);
  56
  57   return c;
  58 }
  59
  60
  61 static _IO_size_t
  62 _IO_obstack_xsputn (_IO_FILE *fp, const void *data, _IO_size_t n)
  63 {
  64   struct obstack *obstack = ((struct _IO_obstack_file *) fp)->obstack;
  65
  66   if (fp->_IO_write_ptr + n > fp->_IO_write_end)
  67     {
  68       /* We need some more memory.  First shrink the buffer to the
  69          space we really currently need.  */
  70       obstack_blank (obstack, fp->_IO_write_ptr - fp->_IO_write_end);
  71
  72       /* Now grow for N bytes.  */
  73       obstack_blank (obstack, n);
  74
  75       /* Setup the buffer pointers again.  */
  76       fp->_IO_write_base = obstack_base (obstack);
  77       fp->_IO_write_ptr = obstack_next_free (obstack);
  78       fp->_IO_write_end = (fp->_IO_write_base + obstack_room (obstack));
  79       /* Now allocate the rest of the current chunk.  */
  80       obstack_blank_fast (obstack, fp->_IO_write_end - fp->_IO_write_ptr);
  81     }
  82   else
  83     fp->_IO_write_ptr = __mempcpy (fp->_IO_write_ptr, data, n);
  84
  85   return n;
  86 }
  87
  88
  89 /* the jump table.  */
  90 static struct _IO_jump_t _IO_obstack_jumps =
  91 {
  92   JUMP_INIT_DUMMY,
  93   JUMP_INIT(finish, NULL),
  94   JUMP_INIT(overflow, _IO_obstack_overflow),
  95   JUMP_INIT(underflow, NULL),
  96   JUMP_INIT(uflow, NULL),
  97   JUMP_INIT(pbackfail, NULL),
  98   JUMP_INIT(xsputn, _IO_obstack_xsputn),
  99   JUMP_INIT(xsgetn, NULL),
 100   JUMP_INIT(seekoff, NULL),
 101   JUMP_INIT(seekpos, NULL),
 102   JUMP_INIT(setbuf, NULL),
 103   JUMP_INIT(sync, NULL),
 104   JUMP_INIT(doallocate, NULL),
 105   JUMP_INIT(read, NULL),
 106   JUMP_INIT(write, NULL),
 107   JUMP_INIT(seek, NULL),
 108   JUMP_INIT(close, NULL),
 109   JUMP_INIT(stat, NULL),
 110   JUMP_INIT(showmanyc, NULL),
 111   JUMP_INIT(imbue, NULL)
 112 };
 113
 114
 115 int
 116 _IO_obstack_vprintf (struct obstack *obstack, const char *format, va_list args)
 117 {
 118   struct obstack_FILE
 119     {
 120       struct _IO_obstack_file ofile;
 121 #ifdef _IO_MTSAFE_IO
 122       _IO_lock_t lock;
 123 #endif
 124   } new_f;
 125   int result;
 126
 127 #ifdef _IO_MTSAFE_IO
 128   new_f.ofile.file._lock = &new_f.lock;
 129 #endif
 130
 131   _IO_init ((_IO_FILE *) &new_f.ofile, 0);
 132   _IO_JUMPS (&new_f.ofile.file) = &_IO_obstack_jumps;
 133   _IO_str_init_static (&new_f.ofile.file, obstack_base (obstack),
 134                        (obstack_object_size (obstack) +
 135                         obstack_room (obstack)), obstack_next_free (obstack));
 136   /* Now allocate the rest of the current chunk.  */
 137   obstack_blank_fast (obstack,
 138                       (new_f.ofile.file._IO_write_end
 139                        - new_f.ofile.file._IO_write_ptr));
 140   new_f.ofile.obstack = obstack;
 141
 142   result = _IO_vfprintf ((_IO_FILE *) &new_f, format, args);
 143
 144   /* Shrink the buffer to the space we really currently need.  */
 145   obstack_blank (obstack, (new_f.ofile.file._IO_write_ptr
 146                            - new_f.ofile.file._IO_write_end));
 147
 148   return result;
 149 }
 150 #ifdef weak_alias
 151 weak_alias (_IO_obstack_vprintf, obstack_vprintf)
 152 #endif
 153
 154
 155 int
 156 _IO_obstack_printf (struct obstack *obstack, const char *format, ...)
 157 {
 158   int result;
 159   va_list ap;
 160   va_start (ap, format);
 161   result = _IO_obstack_vprintf (obstack, format, ap);
 162   va_end (ap);
 163   return result;
 164 }
 165 #ifdef weak_alias
 166 weak_alias (_IO_obstack_printf, obstack_printf)
 167 #endif