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author | Nicholas Noll <nbnoll@eml.cc> | 2021-10-26 21:01:41 -0700 |
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committer | Nicholas Noll <nbnoll@eml.cc> | 2021-10-26 21:01:41 -0700 |
commit | 29b56ef4e4113bcd091b19d6926f18814162ca53 (patch) | |
tree | a4888a16927576592af13928bb805f1f2b1159d6 /sys/libunicode/fullrune.c | |
parent | e34a4791b72e426b02f33496fe03be1ad81819a6 (diff) |
Feat(libunicode): Added an explicit unicode library
Refactored code to pull out utf8 functions from base into a standalone
library. Also left the required function inside arg.c so that code that
calls ARG_BEGIN doesn't have to link to libunicode.
Diffstat (limited to 'sys/libunicode/fullrune.c')
-rw-r--r-- | sys/libunicode/fullrune.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/sys/libunicode/fullrune.c b/sys/libunicode/fullrune.c new file mode 100644 index 0000000..e5cf314 --- /dev/null +++ b/sys/libunicode/fullrune.c @@ -0,0 +1,18 @@ +#include "internal.h" + +int +utf8·fullrune(byte* s, int n) +{ + int i; + rune c; + + if (n <= 0) return 0; + c = *(ubyte*) s; + if (c < Tx) return 1; + + for (i = 3; i < UTFmax + 1; i++) { + if (c < Tbyte(i)) return n >= i - 1; + } + + return n >= UTFmax; +} |