diff options
Diffstat (limited to 'Src/Zle/zle_misc.c')
| -rw-r--r-- | Src/Zle/zle_misc.c | 34 |
1 files changed, 29 insertions, 5 deletions
diff --git a/Src/Zle/zle_misc.c b/Src/Zle/zle_misc.c index e00f22b04..d3a9413f3 100644 --- a/Src/Zle/zle_misc.c +++ b/Src/Zle/zle_misc.c @@ -50,19 +50,43 @@ doinsert(ZLE_STRING_T zstr, int len) if (insmode) spaceinline(m * len); else { - int pos = zlecs, count = m * len, i = count, diff; + int pos = zlecs, diff, i; + + /* + * Calculate the number of character positions we are + * going to be using. The algorithm is that + * anything that shows up as a logical single character + * (i.e. even if control, or double width, or with combining + * characters) is treated as 1 for the purpose of replacing + * what's there already. + */ + for (i = 0, count = 0; i < len; i++) { + int width = wcwidth(zstr[i]); + count += (width != 0) ? 1 : 0; + } /* * Ensure we replace a complete combining character * for each character we overwrite. */ - while (pos < zlell && i--) { + for (i = count; pos < zlell && i--; ) { INCPOS(pos); } - diff = pos - zlecs - count; + /* + * Calculate how many raw line places we need. + * pos - zlecs is the raw line distance we're replacing, + * m * len the number we're inserting. + */ + diff = pos - zlecs - m * len; if (diff < 0) { spaceinline(-diff); - } else if (diff > 0) - foredel(diff, CUT_RAW); + } else if (diff > 0) { + /* + * We use shiftchars() here because we don't + * want combining char alignment fixed up: we + * are going to write over any that remain. + */ + shiftchars(zlecs, diff); + } } while (m--) for (s = zstr, count = len; count; s++, count--) |