mandoc: When the last line of the input is empty and the previous line

mandoc: When the last line of the input is empty and the previous line

[schwarze]

Log Message:
-----------
When the last line of the input is empty and the previous line reduced
the line input buffer to a length of one byte, do not write one byte 
past the end of the line input buffer.  Minimal code to show the bug:
printf ".ds X\n.X\n\n" | MALLOC_OPTIONS=C mandoc
Bug found by bentley@ in the sysutils/rancid par(1) manual page.

Modified Files:
--------------
    mandoc:
        read.c

Revision Data
-------------
Index: read.c
===================================================================
RCS file: /home/cvs/mandoc/mandoc/read.c,v
retrieving revision 1.211
retrieving revision 1.212
diff -Lread.c -Lread.c -u -p -r1.211 -r1.212
--- read.c
+++ read.c
@@ -255,6 +255,8 @@ mparse_buf_r(struct mparse *curp, struct
 		/* XXX Ugly hack to mark the end of the input. */
 
 		if (i == blk.sz || blk.buf[i] == '\0') {
+			if (pos + 2 > ln.sz)
+				resize_buf(&ln, 256);
 			ln.buf[pos++] = '\n';
 			ln.buf[pos] = '\0';
 		}
--
 To unsubscribe send an email to source+unsubscribe@mandoc.bsd.lv