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-rw-r--r--libarchive/archive_string.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/libarchive/archive_string.c b/libarchive/archive_string.c
index 399299ea631f..c77dcf52c25f 100644
--- a/libarchive/archive_string.c
+++ b/libarchive/archive_string.c
@@ -744,7 +744,8 @@ archive_string_append_from_wcs_in_codepage(struct archive_string *as,
else
dp = &defchar_used;
count = WideCharToMultiByte(to_cp, 0, ws, wslen,
- as->s + as->length, (int)as->buffer_length-1, NULL, dp);
+ as->s + as->length,
+ (int)as->buffer_length - as->length - 1, NULL, dp);
if (count == 0 &&
GetLastError() == ERROR_INSUFFICIENT_BUFFER) {
/* Expand the MBS buffer and retry. */