2 files changed, 25 insertions, 11 deletions

diff --git a/ui-snapshot.c b/ui-snapshot.c
index f25613e..5372f5d 100644
--- a/ui-snapshot.c
+++ b/ui-snapshot.c
@@ -63,132 +63,143 @@ const struct cgit_snapshot_format cgit_snapshot_formats[] = {
         { ".tar", "application/x-tar", write_tar_archive, 0x8 },
         {}
 };
 
 static const struct cgit_snapshot_format *get_format(const char *filename)
 {
         const struct cgit_snapshot_format *fmt;
         int fl, sl;
 
         fl = strlen(filename);
         for(fmt = cgit_snapshot_formats; fmt->suffix; fmt++) {
                 sl = strlen(fmt->suffix);
                 if (sl >= fl)
                         continue;
                 if (!strcmp(fmt->suffix, filename + fl - sl))
                         return fmt;
         }
         return NULL;
 }
 
 static int make_snapshot(const struct cgit_snapshot_format *format,
                          const char *hex, const char *prefix,
                          const char *filename)
 {
         struct archiver_args args;
         struct commit *commit;
         unsigned char sha1[20];
 
         if(get_sha1(hex, sha1)) {
                 cgit_print_error(fmt("Bad object id: %s", hex));
                 return 1;
         }
         commit = lookup_commit_reference(sha1);
         if(!commit) {
                 cgit_print_error(fmt("Not a commit reference: %s", hex));
                 return 1;
         }
         memset(&args, 0, sizeof(args));
         if (prefix) {
                 args.base = fmt("%s/", prefix);
                 args.baselen = strlen(prefix) + 1;
         } else {
                 args.base = "";
                 args.baselen = 0;
         }
         args.tree = commit->tree;
         args.time = commit->date;
         ctx.page.mimetype = xstrdup(format->mimetype);
         ctx.page.filename = xstrdup(filename);
         cgit_print_http_headers(&ctx);
         format->write_func(&args);
         return 0;
 }
 
 /* Try to guess the requested revision from the requested snapshot name.
  * First the format extension is stripped, e.g. "cgit-0.7.2.tar.gz" become
  * "cgit-0.7.2". If this is a valid commit object name we've got a winner.
  * Otherwise, if the snapshot name has a prefix matching the result from
  * repo_basename(), we strip the basename and any following '-' and '_'
  * characters ("cgit-0.7.2" -> "0.7.2") and check the resulting name once
  * more. If this still isn't a valid commit object name, we check if pre-
  * pending a 'v' to the remaining snapshot name ("0.7.2" -> "v0.7.2") gives
  * us something valid.
  */
 static const char *get_ref_from_filename(const char *url, const char *filename,
                                          const struct cgit_snapshot_format *format)
 {
         const char *reponame;
         unsigned char sha1[20];
         char *snapshot;
 
         snapshot = xstrdup(filename);
         snapshot[strlen(snapshot) - strlen(format->suffix)] = '\0';
         fprintf(stderr, "snapshot=%s\n", snapshot);
 
         if (get_sha1(snapshot, sha1) == 0)
                 return snapshot;
 
         reponame = cgit_repobasename(url);
         fprintf(stderr, "reponame=%s\n", reponame);
         if (prefixcmp(snapshot, reponame) == 0) {
                 snapshot += strlen(reponame);
                 while (snapshot && (*snapshot == '-' || *snapshot == '_'))
                         snapshot++;
         }
 
         if (get_sha1(snapshot, sha1) == 0)
                 return snapshot;
 
         snapshot = fmt("v%s", snapshot);
         if (get_sha1(snapshot, sha1) == 0)
                 return snapshot;
 
         return NULL;
 }
 
+void show_error(char *msg)
+{
+        ctx.page.mimetype = "text/html";
+        cgit_print_http_headers(&ctx);
+        cgit_print_docstart(&ctx);
+        cgit_print_pageheader(&ctx);
+        cgit_print_error(msg);
+        cgit_print_docend();
+}
+
 void cgit_print_snapshot(const char *head, const char *hex,
                          const char *filename, int snapshots, int dwim)
 {
         const struct cgit_snapshot_format* f;
         char *prefix = NULL;
 
+        if (!filename) {
+                show_error("No snapshot name specified");
+                return;
+        }
+
         f = get_format(filename);
         if (!f) {
-                ctx.page.mimetype = "text/html";
-                cgit_print_http_headers(&ctx);
-                cgit_print_docstart(&ctx);
-                cgit_print_pageheader(&ctx);
-                cgit_print_error(fmt("Unsupported snapshot format: %s", filename));
-                cgit_print_docend();
+                show_error(xstrdup(fmt("Unsupported snapshot format: %s",
+                                       filename)));
                 return;
         }
 
         if (!hex && dwim) {
                 hex = get_ref_from_filename(ctx.repo->url, filename, f);
                 if (hex == NULL) {
                         html_status(404, "Not found", 0);
                         return;
                 }
                 prefix = xstrdup(filename);
                 prefix[strlen(filename) - strlen(f->suffix)] = '\0';
         }
 
         if (!hex)
                 hex = head;
 
         if (!prefix)
                 prefix = xstrdup(cgit_repobasename(ctx.repo->url));
 
         make_snapshot(f, hex, prefix, filename);
         free(prefix);
 }
diff --git a/ui-tree.c b/ui-tree.c
index c6159ec..553dbaa 100644
--- a/ui-tree.c
+++ b/ui-tree.c
@@ -1,128 +1,131 @@
 /* ui-tree.c: functions for tree output
  *
  * Copyright (C) 2006 Lars Hjemli
  *
  * Licensed under GNU General Public License v2
  *   (see COPYING for full license text)
  */
 
 #include <ctype.h>
 #include "cgit.h"
 #include "html.h"
 #include "ui-shared.h"
 
 char *curr_rev;
 char *match_path;
 int header = 0;
 
 static void print_text_buffer(char *buf, unsigned long size)
 {
         unsigned long lineno, idx;
         const char *numberfmt =
                 "<a class='no' id='n%1$d' name='n%1$d' href='#n%1$d'>%1$d</a>\n";
 
         html("<table summary='blob content' class='blob'>\n");
         html("<tr><td class='linenumbers'><pre>");
         idx = 0;
         lineno = 0;
-        htmlf(numberfmt, ++lineno);
-        while(idx < size - 1) { // skip absolute last newline
-                if (buf[idx] == '\n')
-                        htmlf(numberfmt, ++lineno);
-                idx++;
+
+        if (size) {
+                htmlf(numberfmt, ++lineno);
+                while(idx < size - 1) { // skip absolute last newline
+                        if (buf[idx] == '\n')
+                                htmlf(numberfmt, ++lineno);
+                        idx++;
+                }
         }
         html("</pre></td>\n");
         html("<td class='lines'><pre><code>");
         html_txt(buf);
         html("</code></pre></td></tr></table>\n");
 }
 
 #define ROWLEN 32
 
 static void print_binary_buffer(char *buf, unsigned long size)
 {
         unsigned long ofs, idx;
         static char ascii[ROWLEN + 1];
 
         html("<table summary='blob content' class='bin-blob'>\n");
         html("<tr><th>ofs</th><th>hex dump</th><th>ascii</th></tr>");
         for (ofs = 0; ofs < size; ofs += ROWLEN, buf += ROWLEN) {
                 htmlf("<tr><td class='right'>%04x</td><td class='hex'>", ofs);
                 for (idx = 0; idx < ROWLEN && ofs + idx < size; idx++)
                         htmlf("%*s%02x",
                               idx == 16 ? 4 : 1, "",
                               buf[idx] & 0xff);
                 html(" </td><td class='hex'>");
                 for (idx = 0; idx < ROWLEN && ofs + idx < size; idx++)
                         ascii[idx] = isgraph(buf[idx]) ? buf[idx] : '.';
                 ascii[idx] = '\0';
                 html_txt(ascii);
                 html("</td></tr>\n");
         }
         html("</table>\n");
 }
 
 static void print_object(const unsigned char *sha1, char *path)
 {
         enum object_type type;
         char *buf;
         unsigned long size;
 
         type = sha1_object_info(sha1, &size);
         if (type == OBJ_BAD) {
                 cgit_print_error(fmt("Bad object name: %s",
                                      sha1_to_hex(sha1)));
                 return;
         }
 
         buf = read_sha1_file(sha1, &type, &size);
         if (!buf) {
                 cgit_print_error(fmt("Error reading object %s",
                                      sha1_to_hex(sha1)));
                 return;
         }
 
         html(" (");
         cgit_plain_link("plain", NULL, NULL, ctx.qry.head,
                         curr_rev, path);
         htmlf(")<br/>blob: %s\n", sha1_to_hex(sha1));
 
         if (buffer_is_binary(buf, size))
                 print_binary_buffer(buf, size);
         else
                 print_text_buffer(buf, size);
 }
 
 
 static int ls_item(const unsigned char *sha1, const char *base, int baselen,
                    const char *pathname, unsigned int mode, int stage,
                    void *cbdata)
 {
         char *name;
         char *fullpath;
         enum object_type type;
         unsigned long size = 0;
 
         name = xstrdup(pathname);
         fullpath = fmt("%s%s%s", ctx.qry.path ? ctx.qry.path : "",
                        ctx.qry.path ? "/" : "", name);
 
         if (!S_ISGITLINK(mode)) {
                 type = sha1_object_info(sha1, &size);
                 if (type == OBJ_BAD) {
                         htmlf("<tr><td colspan='3'>Bad object: %s %s</td></tr>",
                               name,
                               sha1_to_hex(sha1));
                         return 0;
                 }
         }
 
         html("<tr><td class='ls-mode'>");
         cgit_print_filemode(mode);
         html("</td><td>");
         if (S_ISGITLINK(mode)) {
                 htmlf("<a class='ls-mod' href='");
                 html_attr(fmt(ctx.repo->module_link,
                               name,
                               sha1_to_hex(sha1)));
                 html("'>");