html: html_ntxt with no ellipsis

For implementing a ui-blame page, there is need for a function that
outputs a selection from a block of text, transformed for HTML output,
but with no further modifications or additions.

Signed-off-by: Jeff Smith <whydoubt@gmail.com>
Reviewed-by: John Keeping <john@keeping.me.uk>

3 files changed, 14 insertions, 23 deletions

diff --git a/html.c b/html.c
index e7e6e07..7f81965 100644
--- a/html.c
+++ b/html.c
@@ -124,29 +124,20 @@ void html_vtxtf(const char *format, va_list ap)
 
 void html_txt(const char *txt)
 {
-        const char *t = txt;
-        while (t && *t) {
-                int c = *t;
-                if (c == '<' || c == '>' || c == '&') {
-                        html_raw(txt, t - txt);
-                        if (c == '>')
-                                html("&gt;");
-                        else if (c == '<')
-                                html("&lt;");
-                        else if (c == '&')
-                                html("&amp;");
-                        txt = t + 1;
-                }
-                t++;
-        }
-        if (t != txt)
-                html(txt);
+        if (txt)
+                html_ntxt(txt, strlen(txt));
 }
 
-void html_ntxt(int len, const char *txt)
+ssize_t html_ntxt(const char *txt, size_t len)
 {
         const char *t = txt;
-        while (t && *t && len--) {
+        ssize_t slen;
+
+        if (len > SSIZE_MAX)
+                return -1;
+
+        slen = (ssize_t) len;
+        while (t && *t && slen--) {
                 int c = *t;
                 if (c == '<' || c == '>' || c == '&') {
                         html_raw(txt, t - txt);
@@ -162,8 +153,7 @@ void html_ntxt(int len, const char *txt)
         }
         if (t != txt)
                 html_raw(txt, t - txt);
-        if (len < 0)
-                html("...");
+        return slen;
 }
 
 void html_attrf(const char *fmt, ...)
diff --git a/html.h b/html.h
index 1b24e55..fa4de77 100644
--- a/html.h
+++ b/html.h
@@ -19,7 +19,7 @@ __attribute__((format (printf,1,2)))
 extern void html_attrf(const char *format,...);
 
 extern void html_txt(const char *txt);
-extern void html_ntxt(int len, const char *txt);
+extern ssize_t html_ntxt(const char *txt, size_t len);
 extern void html_attr(const char *txt);
 extern void html_url_path(const char *txt);
 extern void html_url_arg(const char *txt);
diff --git a/ui-repolist.c b/ui-repolist.c
index 7272e87..af52f9b 100644
--- a/ui-repolist.c
+++ b/ui-repolist.c
@@ -329,7 +329,8 @@ void cgit_print_repolist(void)
                 repourl = cgit_repourl(ctx.repo->url);
                 html_link_open(repourl, NULL, NULL);
                 free(repourl);
-                html_ntxt(ctx.cfg.max_repodesc_len, ctx.repo->desc);
+                if (html_ntxt(ctx.repo->desc, ctx.cfg.max_repodesc_len) < 0)
+                        html("...");
                 html_link_close();
                 html("</td><td>");
                 if (ctx.cfg.enable_index_owner) {