varargs.h

strtol: -2147483648 overflows!

utime: 2nd argument == NULL: current time (test!)
tempnam
strtoul
system: shell (DOS)
int86
strftime etc.
spawn* (DOS programs)
exec* (DOS programs)
fork

long long

fmod, frexp
log, etc: return HUGE_VAL, set errno
sin, cos, tan: check C2

_input (width, [])
_output: precision = 0 && number == 0 -> no characters
_output: %diou, precision specified -> ignore 0 flag
_output: see 387 ref
fseek: optimize
ftell (?, text mode)
stat: directory: time/date, drive number
