diff options
Diffstat (limited to 'argp/argp-fmtstream.c')
| -rw-r--r-- | argp/argp-fmtstream.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/argp/argp-fmtstream.c b/argp/argp-fmtstream.c index c7203deac6..ab2e870af8 100644 --- a/argp/argp-fmtstream.c +++ b/argp/argp-fmtstream.c @@ -240,7 +240,14 @@ __argp_fmtstream_update (argp_fmtstream_t fs) nextline = p; } - if (nextline - (nl + 1) < fs->wmargin) + /* Note: There are a bunch of tests below for + NEXTLINE == BUF + LEN + 1; this case is where NL happens to fall + at the end of the buffer, and NEXTLINE is in fact empty (and so + we need not be careful to maintain its contents). */ + + if (nextline == buf + len + 1 + ? fs->end - nl < fs->wmargin + 1 + : nextline - (nl + 1) < fs->wmargin) /* The margin needs more blanks than we removed. */ if (fs->end - fs->p > fs->wmargin + 1) /* Make some space for them. */ @@ -265,7 +272,8 @@ __argp_fmtstream_update (argp_fmtstream_t fs) the next word. */ *nl++ = '\n'; - if (nextline - nl >= fs->wmargin) + if (nextline - nl >= fs->wmargin + || (nextline == buf + len + 1 && fs->end - nextline >= fs->wmargin)) /* Add blanks up to the wrap margin column. */ for (i = 0; i < fs->wmargin; ++i) *nl++ = ' '; @@ -275,7 +283,7 @@ __argp_fmtstream_update (argp_fmtstream_t fs) /* Copy the tail of the original buffer into the current buffer position. */ - if (nl != nextline) + if (nl < nextline) memmove (nl, nextline, buf + len - nextline); len -= nextline - buf; |