From 93b063fedfcf7409a67df035170ea5670cad22e1 Mon Sep 17 00:00:00 2001 From: Josh Rahm Date: Tue, 24 Nov 2020 13:46:41 -0700 Subject: Moved action to top level. Removed old iterations of the project and moved the files from 02-usart to the root directory since that's the sole place where the action is and that subproject has outgrown its initial title. --- src/kern/lib.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) create mode 100644 src/kern/lib.c (limited to 'src/kern/lib.c') diff --git a/src/kern/lib.c b/src/kern/lib.c new file mode 100644 index 0000000..88188cc --- /dev/null +++ b/src/kern/lib.c @@ -0,0 +1,56 @@ +#include "kern/lib.h" + +#define nybble_to_hex(n) \ + ((n) < 10 ? 0x30 + (n) : ('A' + ((n) - 10))) + +void hexify(uint32_t v, char* into) +{ + into += 8; + + *(into--) = 0; + + *(into--) = nybble_to_hex(v & 0x0F); + v >>= 4; + *(into--) = nybble_to_hex(v & 0x0F); + v >>= 4; + *(into--) = nybble_to_hex(v & 0x0F); + v >>= 4; + *(into--) = nybble_to_hex(v & 0x0F); + v >>= 4; + + *(into--) = nybble_to_hex(v & 0x0F); + v >>= 4; + *(into--) = nybble_to_hex(v & 0x0F); + v >>= 4; + *(into--) = nybble_to_hex(v & 0x0F); + v >>= 4; + *into = nybble_to_hex(v & 0x0F); + v >>= 4; +} + +void decimalify(int v, char* into) +{ + int c = 0; + int i; + + if (v == 0) { + *(into ++) = '0'; + *into = 0; + return; + } else { + while (v > 0) { + *(into ++) = 0x30 + (v % 10); + v /= 10; + ++ c; + } + } + *into = 0; + + into -= c; + for (i = 0; i < c / 2; ++ i) { + char tmp = into[i]; + into[i] = into[c - i - 1]; + into[c - i - 1] = tmp; + } + +} -- cgit