diff options
Diffstat (limited to 'stdio')
| -rw-r--r-- | stdio/linewrap.h | 45 |
1 files changed, 28 insertions, 17 deletions
diff --git a/stdio/linewrap.h b/stdio/linewrap.h index 7ba337fad2..c569238803 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. */ |