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-rw-r--r--argp/argp-fmtstream.c14
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;