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-rw-r--r--utf8.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/utf8.c b/utf8.c
index 7c342ff4b6..197414af4c 100644
--- a/utf8.c
+++ b/utf8.c
@@ -421,6 +421,52 @@ void strbuf_add_wrapped_bytes(struct strbuf *buf, const char *data, int len,
free(tmp);
}
+void strbuf_utf8_replace(struct strbuf *sb_src, int pos, int width,
+ const char *subst)
+{
+ struct strbuf sb_dst = STRBUF_INIT;
+ char *src = sb_src->buf;
+ char *end = src + sb_src->len;
+ char *dst;
+ int w = 0, subst_len = 0;
+
+ if (subst)
+ subst_len = strlen(subst);
+ strbuf_grow(&sb_dst, sb_src->len + subst_len);
+ dst = sb_dst.buf;
+
+ while (src < end) {
+ char *old;
+ size_t n;
+
+ while ((n = display_mode_esc_sequence_len(src))) {
+ memcpy(dst, src, n);
+ src += n;
+ dst += n;
+ }
+
+ old = src;
+ n = utf8_width((const char**)&src, NULL);
+ if (!src) /* broken utf-8, do nothing */
+ return;
+ if (n && w >= pos && w < pos + width) {
+ if (subst) {
+ memcpy(dst, subst, subst_len);
+ dst += subst_len;
+ subst = NULL;
+ }
+ w += n;
+ continue;
+ }
+ memcpy(dst, old, src - old);
+ dst += src - old;
+ w += n;
+ }
+ strbuf_setlen(&sb_dst, dst - sb_dst.buf);
+ strbuf_attach(sb_src, strbuf_detach(&sb_dst, NULL),
+ sb_dst.len, sb_dst.alloc);
+}
+
int is_encoding_utf8(const char *name)
{
if (!name)