musl/src/internal/procfdname.c

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void __procfdname(char *buf, unsigned fd)
{
unsigned i, j;
for (i=0; (buf[i] = "/proc/self/fd/"[i]); i++);
if (!fd) {
buf[i] = '0';
buf[i+1] = 0;
return;
}
for (j=fd; j; j/=10, i++);
buf[i] = 0;
for (; fd; fd/=10) buf[--i] = '0' + fd%10;
}