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-rw-r--r--pw/pw_group.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/pw/pw_group.c b/pw/pw_group.c
index b20ce88..51166cd 100644
--- a/pw/pw_group.c
+++ b/pw/pw_group.c
@@ -68,7 +68,11 @@ pw_group(struct userconf * cnf, int mode, struct cargs * args)
};
if (a_gid != NULL) {
- if (strspn(a_gid->val, "0123456789") != strlen(a_gid->val))
+ const char *teststr;
+ teststr = a_gid->val;
+ if (*teststr == '-')
+ teststr++;
+ if (strspn(teststr, "0123456789") != strlen(teststr))
errx(EX_USAGE, "-g expects a number");
}