diff options
Diffstat (limited to 'libio/wstrops.c')
| -rw-r--r-- | libio/wstrops.c | 142 |
1 files changed, 45 insertions, 97 deletions
diff --git a/libio/wstrops.c b/libio/wstrops.c index c5aae7b..32f7ef3 100644 --- a/libio/wstrops.c +++ b/libio/wstrops.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1993,1997-1999,2001-2004, 2006 Free Software Foundation, Inc. +/* Copyright (C) 1993,1997-1999,2001-2003,2004 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -25,13 +25,44 @@ This exception applies to code released by its copyright holders in files containing the exception. */ -#include <assert.h> #include "strfile.h" #include "libioP.h" #include <string.h> #include <wchar.h> #include <stdio_ext.h> +#if 0 +/* The following definitions are for exposition only. + They map the terminology used in the ANSI/ISO C++ draft standard + to the implementation. */ + +/* allocated: set when a dynamic array object has been allocated, and + hence should be freed by the destructor for the strstreambuf object. */ +#define ALLOCATED(FP) ((FP)->_f._IO_buf_base && DYNAMIC(FP)) + +/* constant: set when the array object has const elements, + so the output sequence cannot be written. */ +#define CONSTANT(FP) ((FP)->_f._IO_file_flags & _IO_NO_WRITES) + +/* alsize: the suggested minimum size for a dynamic array object. */ +#define ALSIZE(FP) ??? /* not stored */ + +/* palloc: points to the function to call to allocate a dynamic array object.*/ +#define PALLOC(FP) \ + ((FP)->_s._allocate_buffer == default_alloc ? 0 : (FP)->_s._allocate_buffer) + +/* pfree: points to the function to call to free a dynamic array object. */ +#define PFREE(FP) \ + ((FP)->_s._free_buffer == default_free ? 0 : (FP)->_s._free_buffer) + +#endif + +#ifdef TODO +/* An "unbounded buffer" is when a buffer is supplied, but with no + specified length. An example is the buffer argument to sprintf. + */ +#endif + void _IO_wstr_init_static (fp, ptr, size, pstart) _IO_FILE *fp; @@ -67,7 +98,7 @@ _IO_wstr_init_static (fp, ptr, size, pstart) fp->_wide_data->_IO_read_end = end; } /* A null _allocate_buffer function flags the strfile as being static. */ - (((_IO_strfile *) fp)->_s._allocate_buffer) = (_IO_alloc_type)0; + (((_IO_strfile *) fp)->_s._allocate_buffer) = (_IO_alloc_type)0; } _IO_wint_t @@ -85,19 +116,16 @@ _IO_wstr_overflow (fp, c) fp->_wide_data->_IO_write_ptr = fp->_wide_data->_IO_read_ptr; fp->_wide_data->_IO_read_ptr = fp->_wide_data->_IO_read_end; } - pos = fp->_wide_data->_IO_write_ptr - fp->_wide_data->_IO_write_base; + pos = fp->_wide_data->_IO_write_ptr - fp->_wide_data->_IO_write_base; if (pos >= (_IO_size_t) (_IO_wblen (fp) + flush_only)) { - if (fp->_flags2 & _IO_FLAGS2_USER_WBUF) /* not allowed to enlarge */ + if (fp->_flags & _IO_USER_BUF) /* not allowed to enlarge */ return WEOF; else { wchar_t *new_buf; wchar_t *old_buf = fp->_wide_data->_IO_buf_base; - size_t old_wblen = _IO_wblen (fp); - _IO_size_t new_size = 2 * old_wblen + 100; - if (new_size < old_wblen) - return EOF; + _IO_size_t new_size = 2 * _IO_wblen (fp) + 100; new_buf = (wchar_t *) (*((_IO_strfile *) fp)->_s._allocate_buffer) (new_size * sizeof (wchar_t)); @@ -108,14 +136,11 @@ _IO_wstr_overflow (fp, c) } if (old_buf) { - __wmemcpy (new_buf, old_buf, old_wblen); + __wmemcpy (new_buf, old_buf, _IO_wblen (fp)); (*((_IO_strfile *) fp)->_s._free_buffer) (old_buf); /* Make sure _IO_setb won't try to delete _IO_buf_base. */ fp->_wide_data->_IO_buf_base = NULL; } - - wmemset (new_buf + old_wblen, L'\0', new_size - old_wblen); - INTUSE(_IO_wsetb) (fp, new_buf, new_buf + new_size, 1); fp->_wide_data->_IO_read_base = new_buf + (fp->_wide_data->_IO_read_base - old_buf); @@ -138,7 +163,6 @@ _IO_wstr_overflow (fp, c) return c; } - _IO_wint_t _IO_wstr_underflow (fp) _IO_FILE *fp; @@ -157,87 +181,17 @@ _IO_wstr_underflow (fp) return WEOF; } - /* The size of the valid part of the buffer. */ + _IO_ssize_t _IO_wstr_count (fp) _IO_FILE *fp; { - struct _IO_wide_data *wd = fp->_wide_data; - - return ((wd->_IO_write_ptr > wd->_IO_read_end - ? wd->_IO_write_ptr : wd->_IO_read_end) - - wd->_IO_read_base); + return ((fp->_wide_data->_IO_write_ptr > fp->_wide_data->_IO_read_end + ? fp->_wide_data->_IO_write_ptr : fp->_wide_data->_IO_read_end) + - fp->_wide_data->_IO_read_base); } - -static int -enlarge_userbuf (_IO_FILE *fp, _IO_off64_t offset, int reading) -{ - if ((_IO_ssize_t) offset <= _IO_blen (fp)) - return 0; - - struct _IO_wide_data *wd = fp->_wide_data; - - _IO_ssize_t oldend = wd->_IO_write_end - wd->_IO_write_base; - - /* Try to enlarge the buffer. */ - if (fp->_flags2 & _IO_FLAGS2_USER_WBUF) - /* User-provided buffer. */ - return 1; - - _IO_size_t newsize = offset + 100; - wchar_t *oldbuf = wd->_IO_buf_base; - wchar_t *newbuf - = (wchar_t *) (*((_IO_strfile *) fp)->_s._allocate_buffer) (newsize - * sizeof (wchar_t)); - if (newbuf == NULL) - return 1; - - if (oldbuf != NULL) - { - __wmemcpy (newbuf, oldbuf, _IO_wblen (fp)); - (*((_IO_strfile *) fp)->_s._free_buffer) (oldbuf); - /* Make sure _IO_setb won't try to delete - _IO_buf_base. */ - wd->_IO_buf_base = NULL; - } - - INTUSE(_IO_wsetb) (fp, newbuf, newbuf + newsize, 1); - - if (reading) - { - wd->_IO_write_base = newbuf + (wd->_IO_write_base - oldbuf); - wd->_IO_write_ptr = newbuf + (wd->_IO_write_ptr - oldbuf); - wd->_IO_write_end = newbuf + (wd->_IO_write_end - oldbuf); - wd->_IO_read_ptr = newbuf + (wd->_IO_read_ptr - oldbuf); - - wd->_IO_read_base = newbuf; - wd->_IO_read_end = wd->_IO_buf_end; - } - else - { - wd->_IO_read_base = newbuf + (wd->_IO_read_base - oldbuf); - wd->_IO_read_ptr = newbuf + (wd->_IO_read_ptr - oldbuf); - wd->_IO_read_end = newbuf + (wd->_IO_read_end - oldbuf); - wd->_IO_write_ptr = newbuf + (wd->_IO_write_ptr - oldbuf); - - wd->_IO_write_base = newbuf; - wd->_IO_write_end = wd->_IO_buf_end; - } - - /* Clear the area between the last write position and th - new position. */ - assert (offset >= oldend); - if (reading) - wmemset (wd->_IO_read_base + oldend, L'\0', offset - oldend); - else - wmemset (wd->_IO_write_base + oldend, L'\0', offset - oldend); - - return 0; -} - - _IO_off64_t _IO_wstr_seekoff (fp, offset, dir, mode) _IO_FILE *fp; @@ -280,10 +234,7 @@ _IO_wstr_seekoff (fp, offset, dir, mode) default: /* case _IO_seek_set: */ break; } - if (offset < 0) - return EOF; - if ((_IO_ssize_t) offset > cur_size - && enlarge_userbuf (fp, offset, 1) != 0) + if (offset < 0 || (_IO_ssize_t) offset > cur_size) return EOF; fp->_wide_data->_IO_read_ptr = (fp->_wide_data->_IO_read_base + offset); @@ -307,10 +258,7 @@ _IO_wstr_seekoff (fp, offset, dir, mode) default: /* case _IO_seek_set: */ break; } - if (offset < 0) - return EOF; - if ((_IO_ssize_t) offset > cur_size - && enlarge_userbuf (fp, offset, 0) != 0) + if (offset < 0 || (_IO_ssize_t) offset > cur_size) return EOF; fp->_wide_data->_IO_write_ptr = (fp->_wide_data->_IO_write_base + offset); @@ -335,7 +283,7 @@ _IO_wstr_finish (fp, dummy) _IO_FILE *fp; int dummy; { - if (fp->_wide_data->_IO_buf_base && !(fp->_flags2 & _IO_FLAGS2_USER_WBUF)) + if (fp->_wide_data->_IO_buf_base && !(fp->_flags & _IO_USER_BUF)) (((_IO_strfile *) fp)->_s._free_buffer) (fp->_wide_data->_IO_buf_base); fp->_wide_data->_IO_buf_base = NULL; |