fix off-by one error in a2p

The str_gets() function, when encountering a newline character, checked to
see if the previous char was a \ escape. For a blank line, the check would
read the char at the position one before the start of the buffer. There
was a test to avoid this, but it was off-by-one.

1 files changed, 1 insertions, 1 deletions

diff --git a/x2p/str.c b/x2p/str.c
index 86127a0f3a..e12e5e9c12 100644
--- a/x2p/str.c
+++ b/x2p/str.c
@@ -200,7 +200,7 @@ str_gets(STR *str, FILE *fp)
     for (;;) {
 	while (--cnt >= 0) {
 	    if ((*bp++ = *ptr++) == newline) {
-		if (bp <= str->str_ptr || bp[-2] != '\\')
+		if (bp <= str->str_ptr + 1 || bp[-2] != '\\')
 		    goto thats_all_folks;
 		else {
 		    line++;