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-rw-r--r--usr.bin/xargs/strnsubst.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/usr.bin/xargs/strnsubst.c b/usr.bin/xargs/strnsubst.c
index a06197e..bb8b20e 100644
--- a/usr.bin/xargs/strnsubst.c
+++ b/usr.bin/xargs/strnsubst.c
@@ -38,6 +38,11 @@ strnsubst(char **str, const char *match, const char *replstr, size_t maxsize)
if (s2 == NULL)
err(1, "calloc");
+ if (match == NULL || replstr == NULL || maxsize == strlen(*str)) {
+ strlcpy(s2, s1, maxsize);
+ goto done;
+ }
+
for (;;) {
char *this;
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