#include <stdio.h>
#include <string.h>
+void __procfdname(char *, unsigned);
+
int ttyname_r(int fd, char *name, size_t size)
{
char procname[sizeof "/proc/self/fd/" + 3*sizeof(int) + 2];
if (!isatty(fd)) return ENOTTY;
- snprintf(procname, sizeof procname, "/proc/self/fd/%d", fd);
+ __procfdname(procname, fd);
l = readlink(procname, name, size);
if (l < 0) return errno;