diff options
Diffstat (limited to 'stdio')
| -rw-r--r-- | stdio/linewrap.c | 40 |
1 files changed, 34 insertions, 6 deletions
diff --git a/stdio/linewrap.c b/stdio/linewrap.c index e22640da0f..82b6a326a5 100644 --- a/stdio/linewrap.c +++ b/stdio/linewrap.c @@ -149,11 +149,14 @@ lwupdate (FILE *stream, int c, struct line_wrap_data **wrapper_cookie) len = stream->__bufp - buf; nl = memchr (buf, '\n', len); + if (d->point_col < 0) + d->point_col = 0; + if (!nl) { /* The buffer ends in a partial line. */ - if (d->point_col + len + (c != EOF && c != '\n') <= d->rmargin) + if (d->point_col + len + (c != EOF && c != '\n') < d->rmargin) { /* The remaining buffer text is a partial line and fits within the maximum line width. Advance point for the @@ -166,7 +169,7 @@ lwupdate (FILE *stream, int c, struct line_wrap_data **wrapper_cookie) the end of the buffer. */ nl = stream->__bufp; } - else if (d->point_col + (nl - buf) <= d->rmargin) + else if (d->point_col + (nl - buf) < d->rmargin) { /* The buffer contains a full line that fits within the maximum line width. Reset point and scan the next line. */ @@ -176,7 +179,7 @@ lwupdate (FILE *stream, int c, struct line_wrap_data **wrapper_cookie) } /* This line is too long. */ - r = d->rmargin; + r = d->rmargin - 1; if (d->wmargin < 0) { @@ -265,8 +268,10 @@ lwupdate (FILE *stream, int c, struct line_wrap_data **wrapper_cookie) the next word. */ *stream->__bufp++ = '\n'; - /* Reset the counter of what has been output this line. */ - d->point_col = 0; + /* Reset the counter of what has been output this line. If wmargin + is 0, we want to avoid the lmargin getting added, so we set + point_col to a magic value of -1 in that case. */ + d->point_col = d->wmargin ? d->wmargin : -1; /* Add blanks up to the wrap margin column. */ for (i = 0; i < d->wmargin; ++i) @@ -387,8 +392,31 @@ __line_wrap_update (FILE *stream) if (line_wrapped (stream)) { struct line_wrap_data *d = stream->__cookie, *wc = 0; + + if (stream->__linebuf_active) + /* This is an active line-buffered stream, so its put-limit is set to + the beginning of the buffer in order to force a __flshfp call on + each putc (see below). We undo this hack here (by setting the + limit to the end of the buffer) to simplify the interface with the + output-room function. */ + stream->__put_limit = stream->__buffer + stream->__bufsize; + lwupdate (stream, EOF, &wc); + + if (stream->__linebuf) + { + /* This is a line-buffered stream, and it is now ready to do some + output. We call this an "active line-buffered stream". We set + the put_limit to the beginning of the buffer, so the next `putc' + call will force a call to flshfp. Setting the linebuf_active + flag tells the code above (on the next call) to undo this + hackery. */ + stream->__put_limit = stream->__buffer; + stream->__linebuf_active = 1; + } + ensure_wrapped (stream, &wc); + return d; } else @@ -476,7 +504,7 @@ inline size_t line_wrap_point (FILE *stream) { struct line_wrap_data *d = __line_wrap_update (stream); - return d ? d->point_col : -1; + return d ? (d->point_col >= 0 ? d->point_col : 0) : -1; } #ifdef TEST |