diff options
Diffstat (limited to 'sys/cmd/term/util.c')
-rw-r--r-- | sys/cmd/term/util.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/sys/cmd/term/util.c b/sys/cmd/term/util.c new file mode 100644 index 0000000..3e7d81b --- /dev/null +++ b/sys/cmd/term/util.c @@ -0,0 +1,30 @@ +#include <u.h> + +static const uchar table[] = { +#include "nonspacing.h" +}; + +static const uchar wtable[] = { +#include "wide.h" +}; + +int +wcwidth(wchar_t wc) +{ + if (wc < 0xffU) + return (wc+1 & 0x7f) >= 0x21 ? 1 : wc ? -1 : 0; + if ((wc & 0xfffeffffU) < 0xfffe) { + if ((table[table[wc>>8]*32+((wc&255)>>3)]>>(wc&7))&1) + return 0; + if ((wtable[wtable[wc>>8]*32+((wc&255)>>3)]>>(wc&7))&1) + return 2; + return 1; + } + if ((wc & 0xfffe) == 0xfffe) + return -1; + if (wc-0x20000U < 0x20000) + return 2; + if (wc == 0xe0001 || wc-0xe0020U < 0x5f || wc-0xe0100U < 0xef) + return 0; + return 1; +} |