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Fix display_cols: skip ANSI escapes, count CJK/wide chars as 2 columns

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Anders Holck
2026-05-02 09:06:14 +02:00
parent b198855ae5
commit 96c48b0aa9
1 changed files with 34 additions and 5 deletions
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main.c
+34 -5
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@@ -1578,18 +1578,47 @@ static void handle_input(char *line)
}
}
/* Count display columns for a UTF-8 byte string */
/* Count display columns for a UTF-8 byte string (skips ANSI escapes) */
static size_t display_cols(const char *buf, size_t bytes)
{
size_t cols = 0;
size_t i = 0;
while (i < bytes) {
unsigned char c = (unsigned char)buf[i];
/* Skip ANSI escape sequences */
if (c == 0x1B && i + 1 < bytes && buf[i+1] == '[') {
i += 2;
while (i < bytes && !((unsigned char)buf[i] >= 0x40 &&
(unsigned char)buf[i] <= 0x7E))
i++;
if (i < bytes) i++; /* skip final byte */
continue;
}
if (c < 0x80) { i++; cols++; }
else if ((c & 0xE0) == 0xC0) { i += 2; cols++; }
else if ((c & 0xF0) == 0xE0) { i += 3; cols++; }
else if ((c & 0xF8) == 0xF0) { i += 4; cols++; }
else { i++; cols++; }
else if ((c & 0xE0) == 0xC0) {
/* 2-byte: U+0080..U+07FF — all single width */
i += 2; cols++;
} else if ((c & 0xF0) == 0xE0) {
/* 3-byte: U+0800..U+FFFF — CJK ranges are double width */
unsigned int cp = ((c & 0x0F) << 12);
if (i + 1 < bytes) cp |= ((unsigned char)buf[i+1] & 0x3F) << 6;
if (i + 2 < bytes) cp |= ((unsigned char)buf[i+2] & 0x3F);
i += 3;
/* Wide: CJK Unified, Katakana, Hiragana, Hangul, fullwidth, etc. */
if ((cp >= 0x1100 && cp <= 0x115F) ||
(cp >= 0x2E80 && cp <= 0xA4CF && cp != 0x303F) ||
(cp >= 0xAC00 && cp <= 0xD7A3) ||
(cp >= 0xF900 && cp <= 0xFAFF) ||
(cp >= 0xFE10 && cp <= 0xFE6F) ||
(cp >= 0xFF01 && cp <= 0xFF60) ||
(cp >= 0xFFE0 && cp <= 0xFFE6))
cols += 2;
else
cols++;
} else if ((c & 0xF8) == 0xF0) {
/* 4-byte: U+10000..U+10FFFF — most are double width (emoji etc) */
i += 4; cols += 2;
} else { i++; cols++; }
}
return cols;
}