in src/names.c in tar-1.15.1.
/* Return nonzero if NAME contains ".." as a file name
component. */
bool
contains_dot_dot (char const *name)
{
char const *p = name + FILE_SYSTEM_PREFIX_LEN
(name);
for (;; p++)
{
if (p[0] == '.' && p[1] == '.' && (ISSLASH
(p[2]) || !p[2]))
return 1;
do
{
if (! *p++)
return 0;
}
while (! ISSLASH (*p));
}
}
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