- /* skip any initial control characters or spaces */
- while ((c = (unsigned char) *s) &&
-#ifdef LOCALE
- (iscntrl(c) || isspace(c)))
-#else
- (c <= 32))
-#endif
- s++;
-
- /* compact repeated control characters and spaces into a single space */
- while((c = (unsigned char) *s++) && *start < end)
- if (!iscntrl(c) && !isspace(c))
- *(*start)++ = c;
- else {
- while ((c = (unsigned char) *s) &&
-#ifdef LOCALE
- (iscntrl(c) || isspace(c)))
-#else
- (c <= 32))
-#endif
- s++;
- *(*start)++ = ' ';
+ len = strlen(str);
+
+#ifdef MULTIBYTE_SUPPORT
+ mbtowc(NULL, NULL, 0); /* Reset shift state */
+#endif /* MULTIBYTE_SUPPORT */
+
+ /*
+ * Process each character at a time; if we have multibyte support
+ * then deal with that here.
+ */
+
+ while (*str != '\0' && len > 0 && *dest < *end) {
+#ifdef MULTIBYTE_SUPPORT
+ char_len = mbtowc(&wide_char, str, len);
+ w = wcwidth(wide_char);
+
+ /*
+ * Account for multibyte characters, and increment the end pointer
+ * by the number of "extra" bytes in this character. That's the
+ * character length (char_len) minus the column width (w).
+ */
+ if (char_len > 1 && max - *end >= char_len - w) {
+ *end += char_len - w;
+ }
+
+ if (char_len <= 0 || *dest + char_len > *end)
+ break;
+
+ len -= char_len;
+
+ if (iswcntrl(wide_char) || iswspace(wide_char)) {
+ str += char_len;
+#else /* MULTIBYTE_SUPPORT */
+ int c = (unsigned char) *str;
+ len--;
+ if (iscntrl(c) || isspace(c)) {
+ str++;
+#endif /* MULTIBYTE_SUPPORT */
+ if (! prevCtrl) {
+ *(*dest)++ = ' ';
+ }
+
+ prevCtrl = 1;
+ continue;