diff options
Diffstat (limited to 'sys/libunicode/findrune.c')
-rw-r--r-- | sys/libunicode/findrune.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/sys/libunicode/findrune.c b/sys/libunicode/findrune.c new file mode 100644 index 0000000..97edc3c --- /dev/null +++ b/sys/libunicode/findrune.c @@ -0,0 +1,26 @@ +#include "internal.h" + +byte* +utf8·findrune(byte* s, long c) +{ + long c1; + rune r; + int n; + + if (c < RuneSync) return strchr(s, c); + + for (;;) { + c1 = *(ubyte*)s; + if (c1 < RuneSelf) { + if (c1 == 0) return nil; + if (c1 == c) return s; + s++; + continue; + } + n = utf8·bytetorune(&r, s); + if (r == c) return s; + s += n; + } + + return nil; +} |