From 189b9e23edfe60b7e82c4c7b6071a3f98799653a Mon Sep 17 00:00:00 2001 From: Nicholas Noll Date: Tue, 26 Oct 2021 21:32:55 -0700 Subject: fix(unicode): renamed functions to be easier to understand their functions --- sys/libunicode/decode.c | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100644 sys/libunicode/decode.c (limited to 'sys/libunicode/decode.c') diff --git a/sys/libunicode/decode.c b/sys/libunicode/decode.c new file mode 100644 index 0000000..79271f2 --- /dev/null +++ b/sys/libunicode/decode.c @@ -0,0 +1,40 @@ +#include "internal.h" + +int +utf8·decode(byte *s, rune* r) +{ + int c[UTFmax], i; + rune l; + + c[0] = *(ubyte*)(s); + if(c[0] < Tx) { + *r = c[0]; + return 1; + } + + l = c[0]; + for(i = 1; i < UTFmax; i++) { + c[i] = *(ubyte*)(s+i); + c[i] ^= Tx; + if (c[i] & Testx) goto bad; + + l = (l << Bitx) | c[i]; + if(c[0] < Tbyte(i + 2)) { + l &= RuneX(i + 1); + if (i == 1) { + if (c[0] < Tbyte(2) || l <= Rune1) + goto bad; + } else if (l <= RuneX(i) || l > RuneMax) + goto bad; + if (i == 2 && SurrogateMin <= l && l <= SurrogateMax) + goto bad; + + *r = l; + return i + 1; + } + } +bad: + *r = RuneErr; + return 1; +} + -- cgit v1.2.1