diff options
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/findlastrune.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/findlastrune.c')
-rw-r--r-- | sys/libunicode/findlastrune.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/sys/libunicode/findlastrune.c b/sys/libunicode/findlastrune.c new file mode 100644 index 0000000..0dc5032 --- /dev/null +++ b/sys/libunicode/findlastrune.c @@ -0,0 +1,29 @@ +#include "internal.h" + +byte* +utf8·findlastrune(byte* s, long c) +{ + long c1; + rune r; + byte *l; + + if (c < RuneSync) + return strrchr(s, c); + + l = nil; + for(;;){ + c1 = *(ubyte*)s; + if (c1 < RuneSelf) { + if (c1 == 0) return l; + if (c1 == c) l = s; + s++; + continue; + } + c1 = utf8·bytetorune(&r, s); + if (r == c) + l = s; + s += c1; + } + + return nil; +} |