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glibc  2.9
Functions
strops.c File Reference
#include <assert.h>
#include "strfile.h"
#include "libioP.h"
#include <string.h>
#include <stdio_ext.h>

Go to the source code of this file.

Functions

void _IO_str_init_static_internal (_IO_strfile *sf, char *ptr, _IO_size_t size, char *pstart)
void _IO_str_init_static (_IO_strfile *sf, char *ptr, int size, char *pstart)
void _IO_str_init_readonly (_IO_strfile *sf, const char *ptr, int size)
int _IO_str_overflow (_IO_FILE *fp, int c)
int _IO_str_underflow (_IO_FILE *fp)
_IO_ssize_t _IO_str_count (_IO_FILE *fp)
static int enlarge_userbuf (_IO_FILE *fp, _IO_off64_t offset, int reading)
_IO_off64_t _IO_str_seekoff (_IO_FILE *fp, _IO_off64_t offset, int dir, int mode)
int _IO_str_pbackfail (_IO_FILE *fp, int c)
void _IO_str_finish (_IO_FILE *fp, int dummy)

Function Documentation

Definition at line 176 of file strops.c.

{
  return ((fp->_IO_write_ptr > fp->_IO_read_end
          ? fp->_IO_write_ptr : fp->_IO_read_end)
         - fp->_IO_read_base);
}

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void _IO_str_finish ( _IO_FILE fp,
int  dummy 
)

Definition at line 338 of file strops.c.

{
  if (fp->_IO_buf_base && !(fp->_flags & _IO_USER_BUF))
    (((_IO_strfile *) fp)->_s._free_buffer) (fp->_IO_buf_base);
  fp->_IO_buf_base = NULL;

  INTUSE(_IO_default_finish) (fp, 0);
}

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void _IO_str_init_readonly ( _IO_strfile sf,
const char *  ptr,
int  size 
)

Definition at line 82 of file strops.c.

{
  _IO_str_init_static_internal (sf, (char *) ptr, size < 0 ? -1 : size, NULL);
  sf->_sbf._f._IO_file_flags |= _IO_NO_WRITES;
}

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void _IO_str_init_static ( _IO_strfile sf,
char *  ptr,
int  size,
char *  pstart 
)

Definition at line 72 of file strops.c.

{
  return _IO_str_init_static_internal (sf, ptr, size < 0 ? -1 : size, pstart);
}

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void _IO_str_init_static_internal ( _IO_strfile sf,
char *  ptr,
_IO_size_t  size,
char *  pstart 
)

Definition at line 35 of file strops.c.

{
  _IO_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)
    end = ptr + size;
  else
    end = (char *) -1;
  INTUSE(_IO_setb) (fp, ptr, end, 0);

  fp->_IO_write_base = ptr;
  fp->_IO_read_base = ptr;
  fp->_IO_read_ptr = ptr;
  if (pstart)
    {
      fp->_IO_write_ptr = pstart;
      fp->_IO_write_end = end;
      fp->_IO_read_end = pstart;
    }
  else
    {
      fp->_IO_write_ptr = ptr;
      fp->_IO_write_end = ptr;
      fp->_IO_read_end = end;
    }
  /* A null _allocate_buffer function flags the strfile as being static. */
  sf->_s._allocate_buffer = (_IO_alloc_type) 0;
}

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int _IO_str_overflow ( _IO_FILE fp,
int  c 
)

Definition at line 92 of file strops.c.

{
  int flush_only = c == EOF;
  _IO_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))
    {
      fp->_flags |= _IO_CURRENTLY_PUTTING;
      fp->_IO_write_ptr = fp->_IO_read_ptr;
      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 (fp->_flags & _IO_USER_BUF) /* not allowed to enlarge */
       return EOF;
      else
       {
         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;
         if (new_size < old_blen)
           return EOF;
         new_buf
           = (char *) (*((_IO_strfile *) fp)->_s._allocate_buffer) (new_size);
         if (new_buf == NULL)
           {
             /*        __ferror(fp) = 1; */
             return EOF;
           }
         if (old_buf)
           {
             memcpy (new_buf, old_buf, old_blen);
             (*((_IO_strfile *) fp)->_s._free_buffer) (old_buf);
             /* Make sure _IO_setb won't try to delete _IO_buf_base. */
             fp->_IO_buf_base = NULL;
           }
         memset (new_buf + old_blen, '\0', new_size - old_blen);

         INTUSE(_IO_setb) (fp, new_buf, new_buf + new_size, 1);
         fp->_IO_read_base = new_buf + (fp->_IO_read_base - old_buf);
         fp->_IO_read_ptr = new_buf + (fp->_IO_read_ptr - old_buf);
         fp->_IO_read_end = new_buf + (fp->_IO_read_end - old_buf);
         fp->_IO_write_ptr = new_buf + (fp->_IO_write_ptr - old_buf);

         fp->_IO_write_base = new_buf;
         fp->_IO_write_end = fp->_IO_buf_end;
       }
    }

  if (!flush_only)
    *fp->_IO_write_ptr++ = (unsigned char) c;
  if (fp->_IO_write_ptr > fp->_IO_read_end)
    fp->_IO_read_end = fp->_IO_write_ptr;
  return c;
}

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int _IO_str_pbackfail ( _IO_FILE fp,
int  c 
)

Definition at line 327 of file strops.c.

{
  if ((fp->_flags & _IO_NO_WRITES) && c != EOF)
    return EOF;
  return INTUSE(_IO_default_pbackfail) (fp, c);
}

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_IO_off64_t _IO_str_seekoff ( _IO_FILE fp,
_IO_off64_t  offset,
int  dir,
int  mode 
)

Definition at line 250 of file strops.c.

{
  _IO_off64_t new_pos;

  if (mode == 0 && (fp->_flags & _IO_TIED_PUT_GET))
    mode = (fp->_flags & _IO_CURRENTLY_PUTTING ? _IOS_OUTPUT : _IOS_INPUT);

  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;
    }
  else
    {
      _IO_ssize_t cur_size = _IO_str_count(fp);
      new_pos = EOF;

      /* Move the get pointer, if requested. */
      if (mode & _IOS_INPUT)
       {
         switch (dir)
           {
           case _IO_seek_end:
             offset += cur_size;
             break;
           case _IO_seek_cur:
             offset += fp->_IO_read_ptr - fp->_IO_read_base;
             break;
           default: /* case _IO_seek_set: */
             break;
           }
         if (offset < 0)
           return EOF;
         if ((_IO_ssize_t) offset > cur_size
             && enlarge_userbuf (fp, offset, 1) != 0)
           return EOF;
         fp->_IO_read_ptr = fp->_IO_read_base + offset;
         fp->_IO_read_end = fp->_IO_read_base + cur_size;
         new_pos = offset;
       }

      /* Move the put pointer, if requested. */
      if (mode & _IOS_OUTPUT)
       {
         switch (dir)
           {
           case _IO_seek_end:
             offset += cur_size;
             break;
           case _IO_seek_cur:
             offset += fp->_IO_write_ptr - fp->_IO_write_base;
             break;
           default: /* case _IO_seek_set: */
             break;
           }
         if (offset < 0)
           return EOF;
         if ((_IO_ssize_t) offset > cur_size
             && enlarge_userbuf (fp, offset, 0) != 0)
           return EOF;
         fp->_IO_write_ptr = fp->_IO_write_base + offset;
         new_pos = offset;
       }
    }
  return new_pos;
}

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Definition at line 155 of file strops.c.

{
  if (fp->_IO_write_ptr > fp->_IO_read_end)
    fp->_IO_read_end = fp->_IO_write_ptr;
  if ((fp->_flags & _IO_TIED_PUT_GET) && (fp->_flags & _IO_CURRENTLY_PUTTING))
    {
      fp->_flags &= ~_IO_CURRENTLY_PUTTING;
      fp->_IO_read_ptr = fp->_IO_write_ptr;
      fp->_IO_write_ptr = fp->_IO_write_end;
    }
  if (fp->_IO_read_ptr < fp->_IO_read_end)
    return *((unsigned char *) fp->_IO_read_ptr);
  else
    return EOF;
}
static int enlarge_userbuf ( _IO_FILE fp,
_IO_off64_t  offset,
int  reading 
) [static]

Definition at line 186 of file strops.c.

{
  if ((_IO_ssize_t) offset <= _IO_blen (fp))
    return 0;

  _IO_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;
  char *oldbuf = fp->_IO_buf_base;
  char *newbuf
    = (char *) (*((_IO_strfile *) fp)->_s._allocate_buffer) (newsize);
  if (newbuf == NULL)
    return 1;

  if (oldbuf != NULL)
    {
      memcpy (newbuf, oldbuf, _IO_blen (fp));
      (*((_IO_strfile *) fp)->_s._free_buffer) (oldbuf);
      /* Make sure _IO_setb won't try to delete
        _IO_buf_base. */
      fp->_IO_buf_base = NULL;
    }

  INTUSE(_IO_setb) (fp, newbuf, newbuf + newsize, 1);

  if (reading)
    {
      fp->_IO_write_base = newbuf + (fp->_IO_write_base - oldbuf);
      fp->_IO_write_ptr = newbuf + (fp->_IO_write_ptr - oldbuf);
      fp->_IO_write_end = newbuf + (fp->_IO_write_end - oldbuf);
      fp->_IO_read_ptr = newbuf + (fp->_IO_read_ptr - oldbuf);

      fp->_IO_read_base = newbuf;
      fp->_IO_read_end = fp->_IO_buf_end;
    }
  else
    {
      fp->_IO_read_base = newbuf + (fp->_IO_read_base - oldbuf);
      fp->_IO_read_ptr = newbuf + (fp->_IO_read_ptr - oldbuf);
      fp->_IO_read_end = newbuf + (fp->_IO_read_end - oldbuf);
      fp->_IO_write_ptr = newbuf + (fp->_IO_write_ptr - oldbuf);

      fp->_IO_write_base = newbuf;
      fp->_IO_write_end = fp->_IO_buf_end;
    }

  /* Clear the area between the last write position and th
     new position.  */
  assert (offset >= oldend);
  if (reading)
    memset (fp->_IO_read_base + oldend, '\0', offset - oldend);
  else
    memset (fp->_IO_write_base + oldend, '\0', offset - oldend);

  return 0;
}

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