Some string cleanups.

Also, I think I fixed an accidental memory leak I introduced.

src/form.cc

@@ -674,7 +674,6 @@ void Html_tag_content_textarea(DilloHtml *html, const char *tag, int tagsize)
  */
 void Html_tag_close_textarea(DilloHtml *html)
 {
-   char *str;
    int i;
 
    if (html->InFlags & IN_TEXTAREA && !S_TOP(html)->display_none) {
@@ -696,11 +695,11 @@ void Html_tag_close_textarea(DilloHtml *html)
       }
 
       /* The HTML3.2 spec says it can have "text and character entities". */
-      str = a_Html_parse_entities(html, html->Stash->str, html->Stash->len);
+      auto  str = a_Html_parse_entities(html, html->Stash->str, html->Stash->len);
       auto input = Html_get_current_input(*html);
       if (input) {
          input->init_str = str;
-         ((MultiLineTextResource *)input->embed->getResource ())->setText(str);
+         ((MultiLineTextResource *)input->embed->getResource ())->setText(str.c_str());
       }
 
    }

src/html.cc

@@ -1036,20 +1036,20 @@ static const char *Html_parse_entity(DilloHtml *html, const char *token,
  * Parse all the entities in a token. Takes the token and its length, and
  * returns a newly allocated string.
  */
-char *a_Html_parse_entities(DilloHtml *html, const char *token, int toksize)
+std::string
+a_Html_parse_entities(DilloHtml *html, const char *token, int toksize)
 {
    const char *esc_set = "&";
    int i, s, entsize;
-   char *str;
 
    s = strcspn(token, esc_set);
    if (s >= toksize) {
       /* no ampersands */
-      str = dStrndup(token, toksize);
+      return std::string{ token, token + toksize };
    } else {
-      Dstr *ds = dStr_sized_new(toksize);
-
-      dStr_append_l(ds, token, s);
+      std::string ds;
+      ds+= token;
+      ds+= s;
 
       for (i = s; i < toksize; i++) {
          const char *entstr;
@@ -1058,16 +1058,14 @@ char *a_Html_parse_entities(DilloHtml *html, const char *token, int toksize)
          if (token[i] == '&' &&
              (entstr = Html_parse_entity(html, token+i, toksize-i, &entsize,
                                          is_attr))) {
-            dStr_append(ds, entstr);
+            ds+= entstr;
             i += entsize-1;
          } else {
-            dStr_append_c(ds, token[i]);
+            ds+= token[i];
          }
       }
-      str = ds->str;
-      dStr_free(ds, 0);
+      return ds;
    }
-   return str;
 }
 
 /**
@@ -1185,7 +1183,6 @@ static void Html_process_space(DilloHtml *html, const char *space,
 static void Html_process_word(DilloHtml *html, const char *word, int size)
 {
    int i, j, start;
-   char *Pword;
    DilloHtmlParseMode parse_mode = S_TOP(html)->parse_mode;
 
    if (S_TOP(html)->display_none)
@@ -1201,9 +1198,8 @@ static void Html_process_word(DilloHtml *html, const char *word, int size)
          dStr_append_c(html->Stash, ' ');
          html->StashSpace = false;
       }
-      Pword = a_Html_parse_entities(html, word, size);
-      dStr_append(html->Stash, Pword);
-      dFree(Pword);
+      const std::string Pword= a_Html_parse_entities(html, word, size);
+      dStr_append(html->Stash, Pword.c_str());
 
    } else if (parse_mode == DILLO_HTML_PARSE_MODE_VERBATIM) {
       /* word goes in untouched, it is not processed here. */
@@ -1216,23 +1212,21 @@ static void Html_process_word(DilloHtml *html, const char *word, int size)
 
    } else if (parse_mode == DILLO_HTML_PARSE_MODE_PRE) {
       /* all this overhead is to catch white-space entities */
-      Pword = a_Html_parse_entities(html, word, size);
+      std::string Pword = a_Html_parse_entities(html, word, size);
       for (start = i = 0; Pword[i]; start = i)
          if (isspace(Pword[i])) {
             while (Pword[++i] && isspace(Pword[i])) ;
-            Html_process_space(html, Pword + start, i - start);
+            Html_process_space(html, Pword.c_str() + start, i - start);
          } else {
             while (Pword[++i] && !isspace(Pword[i])) ;
-            HT2TB(html)->addText(Pword + start, i - start, html->wordStyle ());
+            HT2TB(html)->addText(Pword.c_str() + start, i - start, html->wordStyle ());
             html->pre_column += i - start;
             html->PreFirstChar = false;
          }
-      dFree(Pword);
-
    } else {
       const char *word2, *beyond_word2;
 
-      Pword = NULL;
+      std::string Pword;
       if (!memchr(word,'&', size)) {
          /* No entities */
          word2 = word;
@@ -1250,7 +1244,7 @@ static void Html_process_word(DilloHtml *html, const char *word, int size)
                      ;
             }
          }
-         word2 = Pword;
+         word2 = Pword.c_str();
          beyond_word2 = word2 + strlen(word2);
       }
       for (start = i = 0; word2[i]; start = i) {
@@ -1275,8 +1269,6 @@ static void Html_process_word(DilloHtml *html, const char *word, int size)
             HT2TB(html)->addText(word2 + start, i - start, html->wordStyle ());
          }
       }
-      if (Pword == word2)
-         dFree(Pword);
    }
 }
 
@@ -1978,7 +1970,6 @@ static void Html_tag_content_br(DilloHtml *html, const char *tag, int tagsize)
 static void Html_tag_open_font(DilloHtml *html, const char *tag, int tagsize)
 {
    const char *attrbuf;
-   char *fontFamily = NULL;
    int32_t color;
 
    if ((attrbuf = a_Html_get_attr(html, tag, tagsize, "color"))) {

src/html_common.hh

@@ -289,7 +289,7 @@ std::unique_ptr< DilloUrl > a_Html_url_new(DilloHtml *html,
 void a_Html_common_image_attrs(DilloHtml *html, const char *tag, int tagsize);
 std::shared_ptr< DilloImage > a_Html_image_new(DilloHtml *html, const char *tag, int tagsize);
 
-char *a_Html_parse_entities(DilloHtml *html, const char *token, int toksize);
+std::string a_Html_parse_entities(DilloHtml *html, const char *token, int toksize);
 void a_Html_pop_tag(DilloHtml *html, int TagIdx);
 void a_Html_stash_init(DilloHtml *html);
 int32_t a_Html_color_parse(DilloHtml *html, const char *str,