diff options
Diffstat (limited to 'libio/obprintf.c')
| -rw-r--r-- | libio/obprintf.c | 54 |
1 files changed, 42 insertions, 12 deletions
diff --git a/libio/obprintf.c b/libio/obprintf.c index 29e09d4..cefe9a4 100644 --- a/libio/obprintf.c +++ b/libio/obprintf.c @@ -1,5 +1,5 @@ /* Print output of stream to given obstack. - Copyright (C) 1996, 1997, 1999 Free Software Foundation, Inc. + Copyright (C) 1996, 1997, 1999, 2000 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. @@ -23,6 +23,7 @@ #include <stdlib.h> #endif #include "libioP.h" +#include <assert.h> #include <string.h> #include <errno.h> #include <obstack.h> @@ -40,18 +41,20 @@ static int _IO_obstack_overflow (_IO_FILE *fp, int c) { struct obstack *obstack = ((struct _IO_obstack_file *) fp)->obstack; + int size; /* Make room for another character. This might as well allocate a new chunk a memory and moves the old contents over. */ - if (c != EOF) - obstack_1grow (obstack, c); + assert (c != EOF); + obstack_1grow (obstack, c); /* Setup the buffer pointers again. */ fp->_IO_write_base = obstack_base (obstack); fp->_IO_write_ptr = obstack_next_free (obstack); - fp->_IO_write_end = fp->_IO_write_ptr + obstack_room (obstack); + size = obstack_room (obstack); + fp->_IO_write_end = fp->_IO_write_ptr + size; /* Now allocate the rest of the current chunk. */ - obstack_blank_fast (obstack, fp->_IO_write_end - fp->_IO_write_ptr); + obstack_blank_fast (obstack, size); return c; } @@ -64,6 +67,8 @@ _IO_obstack_xsputn (_IO_FILE *fp, const void *data, _IO_size_t n) if (fp->_IO_write_ptr + n > fp->_IO_write_end) { + int size; + /* We need some more memory. First shrink the buffer to the space we really currently need. */ obstack_blank_fast (obstack, fp->_IO_write_ptr - fp->_IO_write_end); @@ -74,9 +79,10 @@ _IO_obstack_xsputn (_IO_FILE *fp, const void *data, _IO_size_t n) /* Setup the buffer pointers again. */ fp->_IO_write_base = obstack_base (obstack); fp->_IO_write_ptr = obstack_next_free (obstack); - fp->_IO_write_end = (fp->_IO_write_ptr + obstack_room (obstack)); + size = obstack_room (obstack); + fp->_IO_write_end = fp->_IO_write_ptr + size; /* Now allocate the rest of the current chunk. */ - obstack_blank_fast (obstack, fp->_IO_write_end - fp->_IO_write_ptr); + obstack_blank_fast (obstack, size); } else fp->_IO_write_ptr = __mempcpy (fp->_IO_write_ptr, data, n); @@ -122,6 +128,8 @@ _IO_obstack_vprintf (struct obstack *obstack, const char *format, va_list args) #endif } new_f; int result; + int size; + int room; #ifdef _IO_MTSAFE_IO new_f.ofile.file.file._lock = &new_f.lock; @@ -129,13 +137,35 @@ _IO_obstack_vprintf (struct obstack *obstack, const char *format, va_list args) _IO_no_init (&new_f.ofile.file.file, 0, -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. */ + size = 64; + + /* Get more memory. */ + obstack_blank (obstack, size); + + /* Recompute who much room we have. */ + room = obstack_room (obstack); + size += room; + + assert (size != 0); + } + _IO_str_init_static (&new_f.ofile.file.file, obstack_base (obstack), - (obstack_object_size (obstack) + - obstack_room (obstack)), obstack_next_free (obstack)); + size, obstack_next_free (obstack)); /* Now allocate the rest of the current chunk. */ - obstack_blank_fast (obstack, - (new_f.ofile.file.file._IO_write_end - - new_f.ofile.file.file._IO_write_ptr)); + 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; result = _IO_vfprintf (&new_f.ofile.file.file, format, args); |