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#include <string.h>
#include <libgen.h>
char *dirname(char *s)
{
size_t i;
if (!s || !*s || !strchr(s, '/')) return ".";
i = strlen(s)-1;
for (; i&&s[i]=='/'; i--);
for (; i&&s[i-1]!='/'; i--);
for (; i&&s[i-1]=='/'; i--);
if (!i && *s=='/') i++;
s[i] = 0;
return s;
}
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