HelenOS sources
_read_num 1331 common/printf/printf_core.c width = _read_num(fmt, &nxt);
_read_num 1345 common/printf/printf_core.c precision = _read_num(fmt, &nxt);
_read_num 1331 kernel/generic/common/printf/printf_core.c width = _read_num(fmt, &nxt);
_read_num 1345 kernel/generic/common/printf/printf_core.c precision = _read_num(fmt, &nxt);
_read_num 1331 uspace/lib/c/common/printf/printf_core.c width = _read_num(fmt, &nxt);
_read_num 1345 uspace/lib/c/common/printf/printf_core.c precision = _read_num(fmt, &nxt);
HelenOS homepage, sources at GitHub