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authorMiles Bader <miles@gnu.org>1996-07-07 16:54:03 +0000
committerMiles Bader <miles@gnu.org>1996-07-07 16:54:03 +0000
commit99ed3e3909cc9be0a853f2e1de83e70fa9c1ff46 (patch)
tree2023c8a6ad35482188de05014c757f3e5346c764 /stdio
parentdd411cc7bc2ffdd07364c2abf0a4ea13cd26d79d (diff)
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Sun Jun 2 22:28:43 1996 Miles Bader <miles@gnu.ai.mit.edu>
* linewrap.c (lwupdate): Update D->point_offs when done. Use memmove instead of memcpy where overlap is possible (not necessary using current implementation of memcpy, but...). (__line_wrap_update): Don't update D->point_offs (lwupdate does it). Fri May 31 11:48:46 1996 Miles Bader <miles@gnu.ai.mit.edu> * linewrap.c (lwupdate): New function, mostly was __line_wrap_update. Use POINT_COL field instead of POINT. (__line_wrap_output): Use lwupdate. (__line_wrap_update): New function. (ensure_unwrapped, ensure_wrapped): New functions. (line_wrap_set_lmargin, line_wrap_set_rmargin, line_wrap_set_wmargin, line_wrap_point): Use __line_wrap_update. * linewrap.h (struct line_wrap_data): Rename POINT field to POINT_COL. Add POINT_OFFS field. (__line_wrap_update): New decl. (line_wrap_set_lmargin, line_wrap_set_rmargin, line_wrap_set_wmargin, line_wrap_point): Use __line_wrap_update.
Diffstat (limited to 'stdio')
-rw-r--r--stdio/linewrap.h45
1 files changed, 28 insertions, 17 deletions
diff --git a/stdio/linewrap.h b/stdio/linewrap.h
index 7ba337f..c569238 100644
--- a/stdio/linewrap.h
+++ b/stdio/linewrap.h
@@ -35,7 +35,12 @@ struct line_wrap_data
{
size_t lmargin, rmargin; /* Left and right margins. */
size_t wmargin; /* Margin to wrap to, or -1 to truncate. */
- size_t point; /* Current column of last chars flushed. */
+
+ /* Point in stdio buffer to which we've processed for wrapping, but
+ not output. */
+ size_t point_offs;
+ /* Output column at POINT_OFFS. */
+ size_t point_col;
/* Original cookie and hooks from the stream. */
void *cookie;
@@ -85,11 +90,18 @@ extern size_t line_wrap_set_wmargin (FILE *stream, size_t wmargin);
the current output point. */
extern size_t line_wrap_point (FILE *stream);
-
#ifdef __OPTIMIZE__
extern void __line_wrap_output (FILE *, int); /* private */
+/* If STREAM is not line-wrapped, return 0. Otherwise all pending text
+ buffered text in STREAM so that the POINT_OFFS field refers to the last
+ position in the stdio buffer, and return the line wrap state object for
+ STREAM. Since all text has been processed, this means that (1) the
+ POINT_COL field refers to the column at which any new text would be added,
+ and (2) any changes to the margin parameters will only affect new text. */
+extern struct line_wrap_data *__line_wrap_update (FILE *stream); /* private */
+
/* Returns true if STREAM is line wrapped. */
extern inline int
line_wrapped (FILE *stream)
@@ -111,15 +123,15 @@ line_wrap_lmargin (FILE *stream)
extern inline size_t
line_wrap_set_lmargin (FILE *stream, size_t lmargin)
{
- if (! line_wrapped (stream))
- return -1;
- else
+ struct line_wrap_data *d = __line_wrap_update (stream);
+ if (d)
{
- struct line_wrap_data *d = stream->__cookie;
size_t old = d->lmargin;
d->lmargin = lmargin;
return old;
}
+ else
+ return -1;
}
/* If STREAM is not line-wrapped return -1, else return its left margin. */
@@ -136,15 +148,15 @@ line_wrap_rmargin (FILE *stream)
extern inline size_t
line_wrap_set_rmargin (FILE *stream, size_t rmargin)
{
- if (! line_wrapped (stream))
- return -1;
- else
+ struct line_wrap_data *d = __line_wrap_update (stream);
+ if (d)
{
- struct line_wrap_data *d = stream->__cookie;
size_t old = d->rmargin;
d->rmargin = rmargin;
return old;
}
+ else
+ return -1;
}
/* If STREAM is not line-wrapped return -1, else return its wrap margin. */
@@ -161,15 +173,15 @@ line_wrap_wmargin (FILE *stream)
extern inline size_t
line_wrap_set_wmargin (FILE *stream, size_t wmargin)
{
- if (! line_wrapped (stream))
- return -1;
- else
+ struct line_wrap_data *d = __line_wrap_update (stream);
+ if (d)
{
- struct line_wrap_data *d = stream->__cookie;
size_t old = d->wmargin;
d->wmargin = wmargin;
return old;
}
+ else
+ return -1;
}
/* If STREAM is not line-wrapped return -1, else return the column number of
@@ -177,9 +189,8 @@ line_wrap_set_wmargin (FILE *stream, size_t wmargin)
extern inline size_t
line_wrap_point (FILE *stream)
{
- if (! line_wrapped (stream))
- return -1;
- return ((struct line_wrap_data *)stream->__cookie)->point;
+ struct line_wrap_data *d = __line_wrap_update (stream);
+ return d ? d->point_col : -1;
}
#endif /* Optimizing. */