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-rw-r--r--pw/pw_user.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/pw/pw_user.c b/pw/pw_user.c
index 483148a..f146b46 100644
--- a/pw/pw_user.c
+++ b/pw/pw_user.c
@@ -322,7 +322,10 @@ pw_user(struct userconf * cnf, int mode, struct cargs * args)
a_name = NULL;
}
} else {
- if (strspn(a_uid->val, "0123456789") != strlen(a_uid->val))
+ const char *teststr = a_uid->val;
+ if (*teststr == '-')
+ teststr++;
+ if (strspn(teststr, "0123456789") != strlen(teststr))
errx(EX_USAGE, "-u expects a number");
}