HelenOS sources

__PRINTF_FLAG_SHOWPLUS   79 common/printf/printf_core.c #define __PRINTF_FLAG_SHOWPLUS     0x00000020
__PRINTF_FLAG_SHOWPLUS   79 kernel/generic/common/printf/printf_core.c #define __PRINTF_FLAG_SHOWPLUS     0x00000020
__PRINTF_FLAG_SHOWPLUS   79 uspace/lib/c/common/printf/printf_core.c #define __PRINTF_FLAG_SHOWPLUS     0x00000020
HelenOS homepage, sources at GitHub