@@ -, +, @@ --- src/scroll.c | 42 ++++++++++++++++++++++++++++++++++++++++-- 1 files changed, 40 insertions(+), 2 deletions(-) --- a/src/scroll.c +++ a/src/scroll.c @@ -34,12 +34,33 @@ struct scroll_data { char *text; + unsigned int show_orig; unsigned int show; unsigned int step; unsigned int start; long resetcolor; }; +int utf8_charlen(char c) { + unsigned char uc = (unsigned char) c; + int len = 0; + + if ((uc & 0x80) == 0) + return 1; + + while ((uc & 0x80) != 0) { + ++len; + uc <<= 1; + } + + return (len > 0 && len <= 4) ? len : -1; +} + +int is_utf8_char_tail(char c) { + unsigned char uc = (unsigned char) c; + return (uc & 0xc0) == 0x80; +} + void parse_scroll_arg(struct text_object *obj, const char *arg, void *free_at_crash) { struct scroll_data *sd; @@ -60,15 +81,16 @@ void parse_scroll_arg(struct text_object *obj, const char *arg, void *free_at_cr sd->step = 1; } sd->text = malloc(strlen(arg + n1) + sd->show + 1); + sd->show_orig = sd->show; if (strlen(arg) > sd->show) { for(n2 = 0; (unsigned int) n2 < sd->show; n2++) { - sd->text[n2] = ' '; + sd->text[n2] = ' '; } sd->text[n2] = 0; } else - sd->text[0] = 0; + sd->text[0] = 0; strcat(sd->text, arg + n1); sd->start = 0; @@ -82,6 +104,8 @@ void print_scroll(struct text_object *obj, char *p, int p_max_size, struct infor { struct scroll_data *sd = obj->data.opaque; unsigned int j, colorchanges = 0, frontcolorchanges = 0, visibcolorchanges = 0, strend; + int charlen = 0; + unsigned int utf8lenfix = 0; char *pwithcolors; char buf[max_user_text]; @@ -109,6 +133,10 @@ void print_scroll(struct text_object *obj, char *p, int p_max_size, struct infor while(*(buf + sd->start) == SPECIAL_CHAR) { sd->start++; } + //skip parts of UTF-8 character which messes up display + while(is_utf8_char_tail(*(buf + sd->start))) { + sd->start++; + } //place all chars that should be visible in p, including colorchanges for(j=0; j < sd->show + visibcolorchanges; j++) { p[j] = *(buf + sd->start + j); @@ -117,7 +145,17 @@ void print_scroll(struct text_object *obj, char *p, int p_max_size, struct infor } //if there is still room fill it with spaces if( ! p[j]) break; + + charlen = utf8_charlen(p[j]); + if(charlen > 1 && charlen - 1 > sd->show + visibcolorchanges - j - 1) { + //if the rest is a part of UTF-8 character fill that with spaces instead + break; + } else { + //count visible length deficiency caused by UTF-8 chars + utf8lenfix += (charlen > 1 ? charlen - 1 : 0); + } } + sd->show = sd->show_orig + utf8lenfix; for(; j < sd->show + visibcolorchanges; j++) { p[j] = ' '; } --