fix dirname to handle input of form "foo/" correctly

[musl] / src / misc / ptsname.c

#include <stdlib.h>
#include <errno.h>

int __ptsname_r(int, char *, size_t);

char *ptsname(int fd)
{
        static char buf[9 + sizeof(int)*3 + 1];
        int err = __ptsname_r(fd, buf, sizeof buf);
        if (err) {
                errno = err;
                return 0;
        }
        return buf;
}