From 8a19547957a86bed3f58c9abc1ac218d04698faf Mon Sep 17 00:00:00 2001 From: Freya Murphy Date: Tue, 8 Apr 2025 10:39:48 -0400 Subject: break apart c libaray --- user/lib/btoa.c | 43 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) create mode 100644 user/lib/btoa.c (limited to 'user/lib/btoa.c') diff --git a/user/lib/btoa.c b/user/lib/btoa.c new file mode 100644 index 0000000..fe5e275 --- /dev/null +++ b/user/lib/btoa.c @@ -0,0 +1,43 @@ +#include + +static char suffixes[] = { 'K', 'M', 'G', 'T', 'P', 'E', 'Z', 'Y', 'R', 'Q' }; + +char *btoa(size_t bytes, char *buf) +{ + // no suffix if under 1K, print up to four digits + if (bytes < 1024) { + ultoa(bytes, buf, 10); + return buf; + } + + // store one digit of remainder for decimal + unsigned int remainder; + // power of 1024 + int power = 0; + + // iterate until remaining bytes fits in three digits + while (bytes >= 1000) { + remainder = (bytes % 1024) * 10 / 1024; + bytes /= 1024; + power += 1; + } + + // end of number + char *end; + + if (bytes >= 10) { + // no decimal + end = ultoa(bytes, buf, 10); + } else { + // decimal + end = ultoa(bytes, buf, 10); + end[0] = '.'; + end = ultoa(remainder, end + 1, 10); + } + + // add suffix + end[0] = suffixes[power - 1]; + end[1] = '\0'; + + return buf; +} -- cgit v1.2.3-freya