Replace single-letter -# self-tests with a named -#test=NAME registry (#427)

The hidden engine self-tests had accreted into a grab-bag of arbitrary
single-letter/-digit -# arms (-#0, -#A, -#W, ...) buried in the htscoremain.c
option switch, with no mnemonics and stale --help text. Collapse them into one
registry: -#test lists every test with a usage hint and one-line description,
and -#test=NAME [args] runs one.

The handlers and the two helpers they used (basic_selftests,
string_safety_selftests) move to a new htsselftest.c keyed by a
{name, args, desc, fn} table; htscoremain.c keeps only a small dispatch that
runs ahead of the no-URL usage gate, so a bare -#test (or an arg-less test like
copyopt/dns/cookies) no longer needs a dummy URL token to be reached. The
genuine debug knobs (-#L, -#C, -#R, -#h, ...) stay as letters in the switch;
only the unit self-tests, whose sole callers are tests/01_engine-*.test, are
renamed, so this is internal-only with no compatibility surface. Behavior is
preserved: each test prints the same result line and exit code, which the
existing assertions pin. Three now-unused includes (htscache_selftest.h,
htsdns_selftest.h, htsencoding.h) drop out of htscoremain.c.

Tests: the engine tests move to -#test=NAME; 01_engine-hashtable now asserts its
success line (not just exit code) so a misrouted registry row can't pass, and a
new 01_engine-selftest-dispatch covers the bare-list and unknown-name paths.

The --help/man "guru options" list now points at -#test instead of enumerating
a stale subset. The lone vestigial alias --debug-testfilters still resolves to
the removed -#0 (it was already non-functional: param1 supplies one argument,
-#0 required two); it is left untouched because editing that array forces
clang-format to reflow the whole untouched table.

Signed-off-by: Xavier Roche <roche@httrack.com>
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

AGENTS.md

@@ -33,8 +33,9 @@ the operational checklist: toolchain, invariants, and how to ship a change.
 - Be terse. Comment the why, in English; translate French comments you touch.
 - Strip AI tells from prose (em-dash overuse, rule-of-three, filler, vague
   attributions). Ref: Wikipedia "Signs of AI writing". Claude Code: `/humanizer`.
-- Behavior change → add a test. Fast path: a hidden `httrack -#N` debug
-  subcommand (`htscoremain.c`) driven by a `tests/NN_*.test`, over a slow crawl.
+- Behavior change → add a test. Fast path: a hidden `httrack -#test=NAME` engine
+  self-test (registry in `htsselftest.c`; `-#test` lists them) driven by a
+  `tests/NN_*.test`, over a slow crawl.
 
 ## Review your change adversarially (strongly suggested)
 Before pushing, and when reviewing others, don't skim for bugs:

man/httrack.1

@@ -3,7 +3,7 @@
 .\"
 .\" This file is generated by man/makeman.sh; do not edit by hand.
 .\" SPDX-License-Identifier: GPL-3.0-or-later
-.TH httrack 1 "13 June 2026" "httrack website copier"
+.TH httrack 1 "26 June 2026" "httrack website copier"
 .SH NAME
 httrack \- offline browser : copy websites to a local directory
 .SH SYNOPSIS
@@ -313,12 +313,8 @@ debug HTTP headers in logfile (\-\-debug\-headers)
 .SS Guru options: (do NOT use if possible)
 .IP \-#X
 *use optimized engine (limited memory boundary checks) (\-\-fast\-engine)
-.IP \-#0
-filter test (\-#0 '*.gif' 'www.bar.com/foo.gif') (\-\-debug\-testfilters <param>)
-.IP \-#1
-simplify test (\-#1 ./foo/bar/../foobar)
-.IP \-#2
-type test (\-#2 /foo/bar.php)
+.IP \-#test
+list engine self\-tests (run one with \-#test=NAME [args])
 .IP \-#C
 cache list (\-#C '*.com/spider*.gif' (\-\-debug\-cache <param>)
 .IP \-#R

src/Makefile.am

@@ -56,7 +56,7 @@ whttrackrundir = $(bindir)
 whttrackrun_SCRIPTS = webhttrack
 
 libhttrack_la_SOURCES =  htscore.c htsparse.c htsback.c htscache.c \
-	htscache_selftest.c htsdns_selftest.c \
+	htscache_selftest.c htsdns_selftest.c htsselftest.c \
 	htscatchurl.c htsfilters.c htsftp.c htshash.c coucal/coucal.c \
 	htshelp.c htslib.c htscoremain.c \
 	htsname.c htsrobots.c htstools.c htswizard.c \
@@ -66,7 +66,7 @@ libhttrack_la_SOURCES =  htscore.c htsparse.c htsback.c htscache.c \
 	md5.c \
 	minizip/ioapi.c minizip/mztools.c minizip/unzip.c minizip/zip.c \
 	hts-indextmpl.h htsalias.h htsback.h htsbase.h htssafe.h \
-	htsbasenet.h htsbauth.h htscache.h htscache_selftest.h htsdns_selftest.h htscatchurl.h  \
+	htsbasenet.h htsbauth.h htscache.h htscache_selftest.h htsdns_selftest.h htsselftest.h htscatchurl.h  \
 	htsconfig.h htscore.h htsparse.h htscoremain.h htsdefines.h  \
 	htsfilters.h htsftp.h htsglobal.h htshash.h coucal/coucal.h \
 	htshelp.h htsindex.h htslib.h htsmd5.h \

src/htscache.c

@@ -220,6 +220,25 @@ struct cache_back_zip_entry {
 	} \
 } while(0)
 
+/* A cache (new.zip) write failed: storage is gone (disk full / dropped share),
+   so the mirror is doomed too. Abort it via exit_xh, don't crash as assertf
+   did. */
+static void cache_zip_write_failed(httrackp *opt, cache_back *cache,
+                                   const char *what, int zErr) {
+  if (!cache->zipWriteFailed) {
+    cache->zipWriteFailed = HTS_TRUE;
+    if (check_fatal_io_errno()) {
+      hts_log_print(opt, LOG_ERROR,
+                    "Mirror aborted: disk full or filesystem problems");
+    } else {
+      hts_log_print(opt, LOG_ERROR,
+                    "Mirror aborted: cache write failed (%s): %s", what,
+                    hts_get_zerror(zErr));
+    }
+  }
+  opt->state.exit_xh = -1; /* fatal: stop the mirror, exit non-zero */
+}
+
 /* Ajout d'un fichier en cache */
 void cache_add(httrackp * opt, cache_back * cache, const htsblk * r,
                const char *url_adr, const char *url_fil, const char *url_save,
@@ -236,6 +255,10 @@ void cache_add(httrackp * opt, cache_back * cache, const htsblk * r,
   const char *url_save_suffix = url_save;
   int zErr;
 
+  /* already failed and aborting; don't touch the broken stream again */
+  if (cache->zipWriteFailed)
+    return;
+
   // robots.txt hack
   if (url_save == NULL) {
     dataincache = 0;            // testing links
@@ -346,9 +369,8 @@ void cache_add(httrackp * opt, cache_back * cache, const htsblk * r,
                                    */
                                   headers, (uInt) strlen(headers), NULL, 0, NULL,       /* comment */
                                   Z_DEFLATED, Z_DEFAULT_COMPRESSION)) != Z_OK) {
-    int zip_zipOpenNewFileInZip_failed = 0;
-
-    assertf(zip_zipOpenNewFileInZip_failed);
+    cache_zip_write_failed(opt, cache, "opening a cache entry", zErr);
+    return;
   }
 
   /* Write data in cache */
@@ -358,9 +380,8 @@ void cache_add(httrackp * opt, cache_back * cache, const htsblk * r,
         if ((zErr =
              zipWriteInFileInZip((zipFile) cache->zipOutput, r->adr,
                                  (int) r->size)) != Z_OK) {
-          int zip_zipWriteInFileInZip_failed = 0;
-
-          assertf(zip_zipWriteInFileInZip_failed);
+          cache_zip_write_failed(opt, cache, "writing to the cache", zErr);
+          return;
         }
       }
     } else {
@@ -381,9 +402,10 @@ void cache_add(httrackp * opt, cache_back * cache, const htsblk * r,
               if ((zErr =
                    zipWriteInFileInZip((zipFile) cache->zipOutput, buff,
                                        (int) nl)) != Z_OK) {
-                int zip_zipWriteInFileInZip_failed = 0;
-
-                assertf(zip_zipWriteInFileInZip_failed);
+                cache_zip_write_failed(opt, cache, "writing to the cache",
+                                       zErr);
+                fclose(fp);
+                return;
               }
             }
           } while(nl > 0);
@@ -397,16 +419,14 @@ void cache_add(httrackp * opt, cache_back * cache, const htsblk * r,
 
   /* Close */
   if ((zErr = zipCloseFileInZip((zipFile) cache->zipOutput)) != Z_OK) {
-    int zip_zipCloseFileInZip_failed = 0;
-
-    assertf(zip_zipCloseFileInZip_failed);
+    cache_zip_write_failed(opt, cache, "closing a cache entry", zErr);
+    return;
   }
 
   /* Flush */
   if ((zErr = zipFlush((zipFile) cache->zipOutput)) != 0) {
-    int zip_zipFlush_failed = 0;
-
-    assertf(zip_zipFlush_failed);
+    cache_zip_write_failed(opt, cache, "flushing the cache", zErr);
+    return;
   }
 }
 

src/htscache_selftest.c

@@ -47,6 +47,7 @@ Please visit our Website: http://www.httrack.com
 #include "htslib.h"
 #include "htszlib.h"
 
+#include <errno.h>
 #include <stdio.h>
 #include <string.h>
 
@@ -316,6 +317,136 @@ static int disk_fallback_selftest(httrackp *opt) {
   return fail;
 }
 
+typedef struct {
+  size_t budget;  /**< bytes allowed through before writes start failing */
+  int fail_errno; /**< errno set on the failing write (ENOSPC, EIO, ...) */
+  int writes;     /**< zwrite call count, to detect re-entry into the stream */
+} writefail_inject;
+
+/* zwrite that copies until the budget runs out, then fails with inj->fail_errno
+   (the #174/#219 condition). Counts calls so the test can prove a flagged cache
+   never re-enters the stream. */
+static uLong selftest_failing_zwrite(voidpf opaque, voidpf stream,
+                                     const void *buf, uLong size) {
+  writefail_inject *inj = (writefail_inject *) opaque;
+
+  inj->writes++;
+  if (inj->budget >= (size_t) size) {
+    inj->budget -= (size_t) size;
+    return (uLong) fwrite(buf, 1, (size_t) size, (FILE *) stream);
+  }
+  errno = inj->fail_errno;
+  return 0; /* short write -> the minizip op returns an error */
+}
+
+/* Open a ZIP whose writes fail past inj->budget, so cache_add() hits an error.
+ */
+static zipFile selftest_open_failing_zip(const char *path,
+                                         writefail_inject *inj) {
+  zlib_filefunc_def ff;
+
+  fill_fopen_filefunc(&ff); /* real fopen/read/seek/close; ignores opaque */
+  ff.zwrite_file = selftest_failing_zwrite;
+  ff.opaque = inj;
+  return zipOpen2(path, APPEND_STATUS_CREATE, NULL, &ff);
+}
+
+/* Store one octet-stream body into `cache` (all-in-cache, body in the ZIP). */
+static void writefail_store(httrackp *opt, cache_back *cache, const char *fil,
+                            const char *body, size_t body_len) {
+  htsblk r;
+  char locbuf[4];
+  char *bodycopy = malloct(body_len);
+
+  hts_init_htsblk(&r);
+  r.statuscode = 200;
+  r.size = (LLint) body_len;
+  strcpybuff(r.msg, "OK");
+  strcpybuff(r.contenttype, "application/octet-stream");
+  locbuf[0] = '\0';
+  r.location = locbuf;
+  r.is_write = 0;
+  memcpy(bodycopy, body, body_len);
+  r.adr = bodycopy;
+  cache_add(opt, cache, &r, "example.com", fil, "example.com/blob.bin", 1,
+            NULL);
+  freet(bodycopy);
+}
+
+/* #174/#219: a failing cache write used to crash via assertf(); it must instead
+   stop the mirror (exit_xh = -1) without crashing. Assert that, plus the cache
+   is flagged and a sibling write doesn't re-enter the broken stream. */
+int cache_write_failure_selftest(httrackp *opt, const char *dir) {
+  int fail = 0;
+  char path[HTS_URLMAXSIZE];
+  /* incompressible + big, so deflate flushes (and fails) mid-write, before
+   * close */
+  static const size_t body_len = 256 * 1024;
+  char *body = malloct(body_len);
+  int phase;
+
+  gen_body(body, body_len, 1 /* incompressible */);
+  fconcat(path, sizeof(path), dir, "/wfail.zip");
+
+  /* phase 0: fail on the body write, fatal errno (ENOSPC, the disk-full
+     branch). phase 1: fail on the open, non-fatal errno (EIO, dropped-share
+     branch). Both must abort the mirror. */
+  for (phase = 0; phase < 2; phase++) {
+    cache_back cache;
+    writefail_inject inj;
+    int writes_after_fail;
+
+    inj.budget = (phase == 0) ? 4096 : 0;
+    inj.fail_errno = (phase == 0) ? ENOSPC : EIO;
+    inj.writes = 0;
+    memset(&cache, 0, sizeof(cache));
+    cache.type = 1;
+    cache.log = stderr;
+    cache.errlog = stderr;
+    cache.hashtable = coucal_new(0);
+    cache.zipOutput = selftest_open_failing_zip(path, &inj);
+    if (cache.zipOutput == NULL) {
+      fprintf(stderr, "cache-writefail: could not open injected ZIP\n");
+      fail++;
+      continue;
+    }
+
+    opt->state.exit_xh = 0; /* clear; the failing write must set it to -1 */
+    writefail_store(opt, &cache, "/blob.bin", body, body_len);
+    if (!cache.zipWriteFailed) {
+      fprintf(stderr, "cache-writefail: phase %d: write error not caught\n",
+              phase);
+      fail++;
+    }
+    if (opt->state.exit_xh != -1) {
+      fprintf(stderr,
+              "cache-writefail: phase %d: mirror not aborted (exit_xh=%d)\n",
+              phase, opt->state.exit_xh);
+      fail++;
+    }
+
+    /* a flagged cache must no-op a sibling write: no further backend write */
+    writes_after_fail = inj.writes;
+    writefail_store(opt, &cache, "/blob2.bin", body, 16);
+    if (inj.writes != writes_after_fail) {
+      fprintf(stderr,
+              "cache-writefail: phase %d: sibling write re-entered the broken "
+              "stream (%d extra backend writes)\n",
+              phase, inj.writes - writes_after_fail);
+      fail++;
+    }
+
+    if (cache.zipOutput != NULL) {
+      zipClose(cache.zipOutput,
+               NULL); /* best-effort; may fail on the backend */
+      cache.zipOutput = NULL;
+    }
+  }
+
+  freet(body);
+  return fail;
+}
+
 int cache_selftests(httrackp *opt, const char *dir) {
   int failures = 0;
   cache_back cache;

src/htscache_selftest.h

@@ -52,6 +52,10 @@ int cache_selftests(httrackp *opt, const char *dir);
    committed file, never by the test). Returns the failed-check count. */
 int cache_golden_selftest(httrackp *opt, const char *dir, int regen);
 
+/* #174/#219: assert a failing cache write aborts the mirror cleanly instead of
+   crashing. Returns the failed-check count. */
+int cache_write_failure_selftest(httrackp *opt, const char *dir);
+
 #endif
 
 #endif

src/htscore.h

@@ -214,6 +214,8 @@ struct cache_back {
   cache_back_zip_entry *zipEntries;
   int zipEntriesOffs;
   int zipEntriesCapa;
+  hts_boolean
+      zipWriteFailed; /**< a cache write failed; stop touching the stream */
 };
 
 #ifndef HTS_DEF_FWSTRUCT_hash_struct

src/htshelp.c

@@ -646,9 +646,7 @@ void help(const char *app, int more) {
   infomsg("");
   infomsg("Guru options: (do NOT use if possible)");
   infomsg(" #X *use optimized engine (limited memory boundary checks)");
-  infomsg(" #0  filter test (-#0 '*.gif' 'www.bar.com/foo.gif')");
-  infomsg(" #1  simplify test (-#1 ./foo/bar/../foobar)");
-  infomsg(" #2  type test (-#2 /foo/bar.php)");
+  infomsg(" #test  list engine self-tests (run one with -#test=NAME [args])");
   infomsg(" #C  cache list (-#C '*.com/spider*.gif'");
   infomsg(" #R  cache repair (damaged cache)");
   infomsg(" #d  debug parser");

src/htslib.c

@@ -4177,9 +4177,10 @@ HTSEXT_API hts_boolean get_httptype_sized(httrackp *opt, char *s, size_t ssize,
     /* Check html -> text/html */
     const char *a = fil + strlen(fil) - 1;
 
-    while((*a != '.') && (*a != '/') && (a > fil))
+    /* a < fil when fil is empty: bound before dereferencing */
+    while ((a > fil) && (*a != '.') && (*a != '/'))
       a--;
-    if (*a == '.' && strlen(a) < 32) {
+    if (a >= fil && *a == '.' && strlen(a) < 32) {
       int j = 0;
 
       a++;

src/htsname.c

@@ -1729,10 +1729,10 @@ char *url_savename_refname_fullpath(httrackp * opt, const char *adr,
     StringBuff(opt->path_log), digest_filename);
 }
 
-/* remove refname if any */
-void url_savename_refname_remove(httrackp * opt, const char *adr,
-                                 const char *fil) {
+/* remove refname if any; HTS_TRUE if it was removed */
+hts_boolean url_savename_refname_remove(httrackp *opt, const char *adr,
+                                        const char *fil) {
   char *filename = url_savename_refname_fullpath(opt, adr, fil);
 
-  (void) UNLINK(filename);
+  return UNLINK(filename) == 0 ? HTS_TRUE : HTS_FALSE;
 }

src/htsname.h

@@ -104,8 +104,9 @@ char *url_md5(char *digest_buffer, const char *fil_complete);
 void url_savename_refname(const char *adr, const char *fil, char *filename);
 char *url_savename_refname_fullpath(httrackp * opt, const char *adr,
                                     const char *fil);
-void url_savename_refname_remove(httrackp * opt, const char *adr,
-                                 const char *fil);
+/* Remove the temp-ref for (adr,fil); HTS_TRUE if it was removed. */
+hts_boolean url_savename_refname_remove(httrackp *opt, const char *adr,
+                                        const char *fil);
 #endif
 
 #endif

src/htsparse.c

@@ -3749,44 +3749,60 @@ int hts_mirror_check_moved(htsmoduleStruct * str,
 
       }                         // bloc
       // erreur HTTP (ex: 404, not found)
-    } else if ((r->statuscode == HTTP_PRECONDITION_FAILED)
-               || (r->statuscode == HTTP_REQUESTED_RANGE_NOT_SATISFIABLE)
-      ) {                       // Precondition Failed, c'est à dire pour nous redemander TOUT le fichier
-      if (fexist_utf8(heap(ptr)->sav)) {
-        remove(heap(ptr)->sav);        // Eliminer
-      } else {
-        hts_log_print(opt, LOG_WARNING,
-                      "Unexpected 412/416 error (%s) for %s%s, '%s' could not be found on disk",
-                      r->msg, urladr(), urlfil(),
-                      heap(ptr)->sav != NULL ? heap(ptr)->sav : "");
+    } else if ((r->statuscode == HTTP_PRECONDITION_FAILED) ||
+               (r->statuscode == HTTP_REQUESTED_RANGE_NOT_SATISFIABLE)) {
+      // 412/416: the resume partial is stale; re-get the whole file (#206)
+      lien_back *itemback = NULL;
+      int had_partial = 0;
+      int ref_existed = 0;
+      int ref_gone;
+
+      // Drop the temp-ref, its partial, and heap->sav so the re-get carries no
+      // Range; else back_add rebuilds the same Range and loops.
+      if (back_unserialize_ref(opt, heap(ptr)->adr, heap(ptr)->fil,
+                               &itemback) == 0) {
+        had_partial = 1;
+        ref_existed = 1;
+        // best-effort: an orphaned partial cannot re-Range once the ref is gone
+        if (fexist_utf8(itemback->url_sav))
+          (void) UNLINK(fconv(OPT_GET_BUFF(opt), OPT_GET_BUFF_SIZE(opt),
+                              itemback->url_sav));
+        back_clear_entry(itemback);
+        freet(itemback);
       }
-      if (!fexist_utf8(heap(ptr)->sav)) {    // Bien éliminé? (sinon on boucle..)
-#if HDEBUG
-        printf("Partial content NOT up-to-date, reget all file for %s\n",
-               heap(ptr)->sav);
-#endif
+      // don't re-record if the ref survived (it would re-Range and loop)
+      ref_gone =
+          url_savename_refname_remove(opt, heap(ptr)->adr, heap(ptr)->fil) ||
+          !ref_existed;
+      if (fexist_utf8(heap(ptr)->sav)) {
+        had_partial = 1;
+        remove(heap(ptr)->sav);
+      }
+
+      // Re-get once, only if a partial existed and both Range triggers are
+      // gone; a failed removal gives up rather than looping. range_used is
+      // unreliable (it does not survive the delayed-type two-pass).
+      if (had_partial && ref_gone && !fexist_utf8(heap(ptr)->sav)) {
         hts_log_print(opt, LOG_DEBUG, "Partial file reget (%s) for %s%s",
                       r->msg, urladr(), urlfil());
-        // enregistrer le MEME lien
         if (hts_record_link(opt, heap(ptr)->adr, heap(ptr)->fil, heap(ptr)->sav, "", "", NULL)) {
-          heap_top()->testmode = heap(ptr)->testmode;   // mode test?
-          heap_top()->link_import = 0;   // pas mode import
+          heap_top()->testmode = heap(ptr)->testmode;
+          heap_top()->link_import = 0;
           heap_top()->depth = heap(ptr)->depth;
           heap_top()->pass2 = max(heap(ptr)->pass2, numero_passe);
           heap_top()->retry = heap(ptr)->retry;
           heap_top()->premier = heap(ptr)->premier;
           heap_top()->precedent = ptr;
-          //
-          // canceller lien actuel
           error = 1;
-          hts_invalidate_link(opt, ptr);  // invalidate hashtable entry
-          //
-        } else {              // oups erreur, plus de mémoire!!
-          XH_uninit;          // désallocation mémoire & buffers
+          hts_invalidate_link(opt, ptr); // invalidate hashtable entry
+        } else {                         // out of memory
+          XH_uninit;
           return 0;
         }
       } else {
-        hts_log_print(opt, LOG_ERROR, "Can not remove old file %s", urlfil());
+        hts_log_print(opt, LOG_WARNING,
+                      "Giving up on partial reget (%s) for %s%s", r->msg,
+                      urladr(), urlfil());
         error = 1;
       }
 

src/htsselftest.h

@@ -0,0 +1,52 @@
+/* ------------------------------------------------------------ */
+/*
+HTTrack Website Copier, Offline Browser for Windows and Unix
+Copyright (C) 2026 Xavier Roche and other contributors
+
+SPDX-License-Identifier: GPL-3.0-or-later
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+Ethical use: we kindly ask that you NOT use this software to harvest email
+addresses or to collect any other private information about people. Doing so
+would dishonor our work and waste the many hours we have spent on it.
+
+Please visit our Website: http://www.httrack.com
+*/
+
+/* ------------------------------------------------------------ */
+/* File: htsselftest.h                                          */
+/*       named dispatch for the hidden engine self-tests        */
+/* Author: Xavier Roche                                         */
+/* ------------------------------------------------------------ */
+
+#ifndef HTSSELFTEST_DEFH
+#define HTSSELFTEST_DEFH
+
+#ifdef HTS_INTERNAL_BYTECODE
+
+#ifndef HTS_DEF_FWSTRUCT_httrackp
+#define HTS_DEF_FWSTRUCT_httrackp
+typedef struct httrackp httrackp;
+#endif
+
+/* Run engine self-test `name` over the positional args argv[0..argc-1], or list
+   the available tests when name is NULL, empty, or "list". Prints the result;
+   returns the process exit code (0 == success). The caller owns option cleanup.
+   Reached through the hidden `httrack -#test[=NAME ...]` subcommand. */
+int hts_selftest(httrackp *opt, const char *name, int argc, char **argv);
+
+#endif
+
+#endif

tests/01_engine-cache-golden.test

@@ -4,7 +4,7 @@
 # POSIX /bin/sh on some platforms (e.g. macOS), so avoid bashisms and GNU-only
 # tool flags despite the #!/bin/bash above.
 
-# Golden cache-format regression test (driven by 'httrack -#B <dir>').
+# Golden cache-format regression test (driven by 'httrack -#test=cache-golden <dir>').
 #
 # 01_engine-cache.test writes the cache with the same build it reads back (a
 # round-trip), so it cannot catch a read-path or ZIP-format regression where
@@ -13,7 +13,7 @@
 # byte-exact.
 #
 # Regenerate the fixture after a deliberate format change with
-# 'httrack -#B <dir> regen', then copy <dir>/hts-cache/new.zip over the
+# 'httrack -#test=cache-golden <dir> regen', then copy <dir>/hts-cache/new.zip over the
 # committed file.
 
 set -eu
@@ -37,11 +37,11 @@ trap 'rm -rf "$dir"' EXIT
 mkdir -p "$dir/hts-cache"
 cp "$fixture/hts-cache/new.zip" "$dir/hts-cache/new.zip"
 
-out=$(httrack -#B "$dir")
+out=$(httrack -#test=cache-golden "$dir")
 
 # Match the exact success line: the read must have found and verified every
-# entry, not merely failed to enter the mode (a bad -#B falls through to the
-# usage screen, which also exits non-zero but never prints this).
+# entry, not merely failed to enter the mode (a renamed/removed test prints the
+# registry to stderr, which also exits non-zero but never prints this).
 test "$out" = "cache-golden: OK" || {
     echo "expected 'cache-golden: OK', got: $out" >&2
     exit 1

tests/01_engine-cache-writefail.test

@@ -0,0 +1,24 @@
+#!/bin/bash
+#
+# Keep this POSIX-portable: the harness runs it via $(BASH), which is a plain
+# POSIX /bin/sh on some platforms (e.g. macOS), so avoid bashisms and GNU-only
+# tool flags despite the #!/bin/bash above.
+
+# Cache write-failure handling (httrack -#test=cache-writefail <dir>). #174/#219.
+# A failing new.zip write (disk full) used to crash the process via assertf; it
+# must instead stop the mirror with a fatal error (exit_xh=-1), no crash. The
+# self-test asserts that; reverting the fix makes -#test=cache-writefail abort (SIGABRT) and fail.
+
+set -eu
+
+dir=$(mktemp -d)
+trap 'rm -rf "$dir"' EXIT
+
+out=$(httrack -#test=cache-writefail "$dir")
+
+# Match the exact success line (error logs also go to stdout); a renamed/removed
+# test prints the registry to stderr, which exits non-zero but never prints this.
+printf '%s\n' "$out" | grep -qx "cache-writefail: OK" || {
+    echo "expected 'cache-writefail: OK', got: $out" >&2
+    exit 1
+}

tests/01_engine-cache.test

@@ -4,7 +4,7 @@
 # POSIX /bin/sh on some platforms (e.g. macOS), so avoid bashisms and GNU-only
 # tool flags despite the #!/bin/bash above.
 
-# Cache create/read/update logic (driven by 'httrack -#A <dir>').
+# Cache create/read/update logic (driven by 'httrack -#test=cache <dir>').
 #
 # The in-process self-test stores several hand-crafted edge entries (normal
 # HTML, an empty redirect with a near-limit location, a non-HTML body kept via
@@ -20,13 +20,13 @@ set -eu
 dir=$(mktemp -d)
 trap 'rm -rf "$dir"' EXIT
 
-# Like the other -# debug modes, a trailing token (the working directory) is
-# required; a bare '-#A' falls through to the usage screen.
-out=$(httrack -#A "$dir")
+# The working directory is a required argument; without it the test prints a
+# usage line to stderr and returns non-zero.
+out=$(httrack -#test=cache "$dir")
 
 # Match the exact success line, so the test cannot pass for an unrelated reason
-# (e.g. the -#A mode being gone and falling through to the usage screen, which
-# also exits non-zero but never prints this).
+# (e.g. the cache test being gone, which prints the registry to stderr but
+# never prints this line).
 test "$out" = "cache-selftest: OK" || {
     echo "expected 'cache-selftest: OK', got: $out" >&2
     exit 1

tests/01_engine-charset.test

@@ -4,13 +4,13 @@
 set -euo pipefail
 
 # charset -> UTF-8 conversion (hts_convertStringToUTF8).
-# -#3 <charset> <string> prints the string re-decoded from <charset> as UTF-8.
+# -#test=charset <charset> <string> prints the string re-decoded from <charset> as UTF-8.
 conv() {
-    test "$(httrack -O /dev/null -#3 "$1" "$2")" == "$3" || exit 1
+    test "$(httrack -O /dev/null -#test=charset "$1" "$2")" == "$3" || exit 1
 }
 # crash probe: malformed input must exit cleanly, not abort.
 runs() {
-    httrack -O /dev/null -#3 "$1" "$2" >/dev/null 2>&1 || exit 1
+    httrack -O /dev/null -#test=charset "$1" "$2" >/dev/null 2>&1 || exit 1
 }
 
 # the source bytes below are UTF-8 (this file is UTF-8); "café" is 0x63 61 66 C3 A9.
@@ -31,7 +31,7 @@ conv 'us-ascii' 'hello' 'hello'
 # unknown charset: ASCII passes through unchanged, but non-ASCII input cannot be
 # decoded and yields empty output (an error is printed to stderr).
 conv 'no-such-charset-xyz' 'abc' 'abc'
-test "$(httrack -O /dev/null -#3 'no-such-charset-xyz' 'café' 2>/dev/null)" == "" || exit 1
+test "$(httrack -O /dev/null -#test=charset 'no-such-charset-xyz' 'café' 2>/dev/null)" == "" || exit 1
 
 # malformed UTF-8 (lone continuation byte, truncated lead byte) must not crash
 runs 'utf-8' $'\x80'

tests/01_engine-cookies.test

@@ -1,14 +1,15 @@
 #!/bin/bash
 #
 # Issue #151 guard: the request Cookie header must be bare RFC 6265 name=value
-# pairs, no $Version/$Path attributes. Driven by the 'httrack -#Q' selftest.
+# pairs, no $Version/$Path attributes. Driven by the 'httrack -#test=cookies' selftest.
 
 set -eu
 
-# A trailing token is required; a bare '-#Q' falls through to the usage screen.
-out=$(httrack -#Q run)
+# 'run' is an ignored placeholder argument.
+out=$(httrack -#test=cookies run)
 
-# Exact-match the success line so a fall-through to usage can't pass the test.
+# Exact-match the success line so a renamed/removed test (it prints the registry
+# to stderr) can't pass.
 test "$out" = "cookie-header: OK" || {
     echo "expected 'cookie-header: OK', got: $out" >&2
     exit 1

tests/01_engine-copyopt.test

@@ -2,15 +2,16 @@
 #
 # Regression guard for the unsigned-enum sentinel trap: copy_htsopt's
 # `if (from->X > -1)` guard is always false for unsigned hts_boolean fields, so
-# they silently stop being copied. Driven by the in-process 'httrack -#9' test.
+# they silently stop being copied. Driven by the in-process 'httrack -#test=copyopt' test.
 # Keep POSIX-portable (harness runs it via $(BASH), a plain /bin/sh on macOS).
 
 set -eu
 
-# A trailing token is required; a bare '-#9' falls through to the usage screen.
-out=$(httrack -#9 run)
+# 'run' is an ignored placeholder argument.
+out=$(httrack -#test=copyopt run)
 
-# Exact-match the success line so a fall-through to usage can't pass the test.
+# Exact-match the success line so a renamed/removed test (it prints the registry
+# to stderr) can't pass.
 test "$out" = "copy-htsopt: OK" || {
     echo "expected 'copy-htsopt: OK', got: $out" >&2
     exit 1

tests/01_engine-dns.test

@@ -5,9 +5,8 @@ set -euo pipefail
 
 # DNS resolver/cache self-test: a mock getaddrinfo (no network) checks address
 # family, single-address selection, the -@i4/-@i6 family filter, and cache reuse.
-# The trailing token is required, like the other -# selftests, so a bare command
-# line isn't treated as "no arguments" and routed to the usage screen.
-out=$(httrack -#D run)
+# 'run' is an ignored placeholder argument.
+out=$(httrack -#test=dns run)
 
 test "$out" = "dns-selftest: OK" || {
     echo "expected 'dns-selftest: OK', got: $out" >&2

tests/01_engine-entities.test

@@ -4,13 +4,13 @@
 set -euo pipefail
 
 # HTML entity unescaping (hts_unescapeEntitiesWithCharset).
-# -#6 <string> prints the string with entities decoded (UTF-8 output).
+# -#test=entities <string> prints the string with entities decoded (UTF-8 output).
 ent() {
-    test "$(httrack -O /dev/null -#6 "$1")" == "$2" || exit 1
+    test "$(httrack -O /dev/null -#test=entities "$1")" == "$2" || exit 1
 }
 # crash probe: malformed input must exit cleanly, not abort.
 runs() {
-    httrack -O /dev/null -#6 "$1" >/dev/null 2>&1 || exit 1
+    httrack -O /dev/null -#test=entities "$1" >/dev/null 2>&1 || exit 1
 }
 
 # named entities

tests/01_engine-filter.test

@@ -4,13 +4,13 @@
 set -euo pipefail
 
 # wildcard filter engine (strjoker), the core of +/- include/exclude rules.
-# -#0 <filter> <string> prints "<string> does match <filter>" or "... does NOT match ...".
+# -#test=filter <filter> <string> prints "<string> does match <filter>" or "... does NOT match ...".
 
 match() {
-    test "$(httrack -O /dev/null -#0 "$1" "$2")" == "$2 does match $1" || exit 1
+    test "$(httrack -O /dev/null -#test=filter "$1" "$2")" == "$2 does match $1" || exit 1
 }
 nomatch() {
-    test "$(httrack -O /dev/null -#0 "$1" "$2")" == "$2 does NOT match $1" || exit 1
+    test "$(httrack -O /dev/null -#test=filter "$1" "$2")" == "$2 does NOT match $1" || exit 1
 }
 
 # bare star matches everything

tests/01_engine-hashtable.test

@@ -3,5 +3,7 @@
 
 set -euo pipefail
 
-# httrack internal hashtable autotest on 100K keys
-httrack -#7 100000
+# httrack internal hashtable autotest on 100K keys. Assert the success line (on
+# stderr) so a misrouted registry entry can't pass on exit code alone.
+out=$(httrack -#test=hashtable 100000 2>&1)
+printf '%s\n' "$out" | grep -q "all hashtable tests were successful!" || exit 1

tests/01_engine-idna.test

@@ -3,13 +3,13 @@
 
 set -euo pipefail
 
-# IDNA / punycode encode (-#4) and decode (-#5). This code has a CVE history,
+# IDNA / punycode encode (-#test=idna-encode) and decode (-#test=idna-decode). This code has a CVE history,
 # so the edge cases below cover passthrough, round-trips, and malformed input.
 
-enc() { test "$(httrack -O /dev/null -#4 "$1")" == "$2" || exit 1; }
-dec() { test "$(httrack -O /dev/null -#5 "$1")" == "$2" || exit 1; }
+enc() { test "$(httrack -O /dev/null -#test=idna-encode "$1")" == "$2" || exit 1; }
+dec() { test "$(httrack -O /dev/null -#test=idna-decode "$1")" == "$2" || exit 1; }
 # crash probe: malformed ACE input must exit cleanly, not abort.
-runs() { httrack -O /dev/null -#5 "$1" >/dev/null 2>&1 || exit 1; }
+runs() { httrack -O /dev/null -#test=idna-decode "$1" >/dev/null 2>&1 || exit 1; }
 
 # encode
 enc 'www.café.com' 'www.xn--caf-dma.com'

tests/01_engine-mime.test

@@ -4,13 +4,13 @@
 set -euo pipefail
 
 # MIME type guessing from extension (get_httptype / give_mimext).
-# -#2 <path> prints "<path> is '<mime>'" then "and its local type is '.<ext>'".
+# -#test=mime <path> prints "<path> is '<mime>'" then "and its local type is '.<ext>'".
 
 mime() {
-    test "$(httrack -O /dev/null -#2 "$1" | head -1)" == "$1 is '$2'" || exit 1
+    test "$(httrack -O /dev/null -#test=mime "$1" | head -1)" == "$1 is '$2'" || exit 1
 }
 unknown() {
-    test "$(httrack -O /dev/null -#2 "$1" | head -1)" == "$1 is of an unknown MIME type" || exit 1
+    test "$(httrack -O /dev/null -#test=mime "$1" | head -1)" == "$1 is of an unknown MIME type" || exit 1
 }
 
 mime '/a/b.html' 'text/html'

tests/01_engine-relative.test

@@ -8,7 +8,7 @@ set -euo pipefail
 # relative path from <curr>'s directory to <link>
 rel() {
     local got
-    got=$(httrack -O /dev/null -#l "$1" "$2")
+    got=$(httrack -O /dev/null -#test=relative "$1" "$2")
     test "$got" == "relative=$3" ||
         {
             echo "FAIL rel($1, $2): got '$got' want 'relative=$3'"
@@ -19,7 +19,7 @@ rel() {
 # resolve <link> against origin <adr>/<fil> -> adr=.. fil=..
 ident() {
     local got
-    got=$(httrack -O /dev/null -#i "$1" "$2" "$3")
+    got=$(httrack -O /dev/null -#test=resolve "$1" "$2" "$3")
     test "$got" == "$4" ||
         {
             echo "FAIL ident($1, $2, $3): got '$got' want '$4'"

tests/01_engine-savename.test

@@ -3,11 +3,11 @@
 
 set -euo pipefail
 
-# Local save-name extension resolution (url_savename via -#N <fil> <content-type>).
+# Local save-name extension resolution (url_savename via -#test=savename <fil> <content-type>).
 # Asserts on the basename of "savename: <path>".
 
 name() {
-    out="$(httrack -O /dev/null -#N "$1" "$2" | sed -n 's/^savename: //p')"
+    out="$(httrack -O /dev/null -#test=savename "$1" "$2" | sed -n 's/^savename: //p')"
     test "${out##*/}" == "$3" || {
         echo "FAIL: '$1' '$2' -> '$out' (want '$3')"
         exit 1

tests/01_engine-selftest-dispatch.test

@@ -0,0 +1,17 @@
+#!/bin/bash
+#
+# The -#test dispatch itself: a bare -#test lists the registry, and an unknown
+# name errors (non-zero, diagnostic) instead of silently passing.
+
+set -eu
+
+# Bare -#test lists known tests (printed to stderr).
+list=$(httrack -#test 2>&1)
+printf '%s\n' "$list" | grep -q "filter" || exit 1
+printf '%s\n' "$list" | grep -q "cache-writefail" || exit 1
+
+# Unknown name: non-zero exit + diagnostic, and no test result line.
+rc=0
+err=$(httrack -#test=bogus 2>&1) || rc=$?
+test "$rc" -ne 0 || exit 1
+printf '%s\n' "$err" | grep -q "Unknown self-test" || exit 1

tests/01_engine-simplify.test

@@ -5,7 +5,7 @@ set -euo pipefail
 
 # path simplify engine (fil_simplifie): collapses ./ and ../ segments.
 simp() {
-    test "$(httrack -O /dev/null -#1 "$1")" == "simplified=$2" || exit 1
+    test "$(httrack -O /dev/null -#test=simplify "$1")" == "simplified=$2" || exit 1
 }
 
 simp './foo/bar/' 'foo/bar/'

tests/01_engine-strsafe.test

@@ -3,23 +3,22 @@
 
 set -euo pipefail
 
-# htssafe.h bounded string operations (driven by 'httrack -#8').
+# htssafe.h bounded string operations (driven by 'httrack -#test=strsafe').
 
 # Success path: every bounded op (strcpybuff/strcatbuff/strncatbuff/strlcpybuff)
-# must behave correctly. Like the other -# debug modes, a trailing token is
-# required (a bare '-#8' falls through to the usage screen).
+# must behave correctly. 'run' selects the success path (vs the overflow modes).
 rc=0
-out=$(httrack -#8 run) || rc=$?
+out=$(httrack -#test=strsafe run) || rc=$?
 test "$rc" -eq 0 || exit 1
 test "$out" == "strsafe: OK" || exit 1
 
 # Overflow path: an over-capacity write into a sized buffer must be caught by
 # the bounded macro and abort the process, not be silently truncated/completed.
 # Assert the htssafe abort signature specifically, so the test cannot pass for
-# an unrelated reason (e.g. the -#8 mode being gone and falling through to the
-# usage screen, which also exits non-zero).
+# an unrelated reason (e.g. the strsafe test being gone, which prints the
+# registry to stderr and also exits non-zero).
 # the bounded macro aborts (non-zero exit), so don't let set -e trip on it
-err=$(httrack -#8 overflow "this string is far too long for the buffer" 2>&1) || true
+err=$(httrack -#test=strsafe overflow "this string is far too long for the buffer" 2>&1) || true
 case "$err" in
 *"strsafe: NOT aborted"*)
     echo "over-capacity write was NOT caught" >&2
@@ -36,7 +35,7 @@ esac
 # capacity (4 bytes into a 4-byte buffer), so this also pins the boundary: a
 # '<=' off-by-one in the capacity check would let it through (and print "NOT
 # aborted"). Match the specific htsbuff abort message, not just any assert.
-err=$(httrack -#8 overflow-buff "abcd" 2>&1) || true
+err=$(httrack -#test=strsafe overflow-buff "abcd" 2>&1) || true
 case "$err" in
 *"strsafe: NOT aborted"*)
     echo "htsbuff over-capacity write was NOT caught" >&2

tests/20_local-resume-loop.test

@@ -0,0 +1,113 @@
+#!/bin/bash
+# Issue #206: a continue/update crawl looped forever when the resume Range got a
+# 416. Pass 1 leaves a partial + temp-ref; pass 2 must terminate and not loop.
+set -u
+
+: "${top_srcdir:=..}"
+testdir=$(cd "$(dirname "$0")" && pwd)
+server="${testdir}/local-server.py"
+
+command -v python3 >/dev/null || ! echo "python3 not found; skipping" || exit 77
+
+tmpdir=$(mktemp -d "${TMPDIR:-/tmp}/httrack_206.XXXXXX") || exit 1
+serverpid=
+crawlpid=
+cleanup() {
+    test -n "$crawlpid" && kill -9 "$crawlpid" 2>/dev/null
+    if test -n "$serverpid"; then
+        kill "$serverpid" 2>/dev/null
+        wait "$serverpid" 2>/dev/null
+    fi
+    rm -rf "$tmpdir"
+}
+trap cleanup EXIT HUP INT QUIT PIPE TERM
+
+# --- start the server, discover its ephemeral port --------------------------
+# RESUME_COUNTER gets a byte per /resume/blob.txt request (pass-2 delta bounds re-gets).
+serverlog="${tmpdir}/server.log"
+counter="${tmpdir}/blobcount"
+RESUME_COUNTER="$counter" python3 "$server" --root "${testdir}/server-root" >"$serverlog" 2>&1 &
+serverpid=$!
+port=
+for _ in $(seq 1 50); do
+    line=$(head -n1 "$serverlog" 2>/dev/null)
+    if test "${line%% *}" == "PORT"; then
+        port="${line#PORT }"
+        break
+    fi
+    kill -0 "$serverpid" 2>/dev/null || {
+        echo "server exited early: $(cat "$serverlog")"
+        exit 1
+    }
+    sleep 0.1
+done
+test -n "$port" || {
+    echo "could not discover server port"
+    exit 1
+}
+base="http://127.0.0.1:${port}"
+
+which httrack >/dev/null || {
+    echo "could not find httrack"
+    exit 1
+}
+out="${tmpdir}/crawl"
+mkdir "$out"
+common=(-O "$out" --quiet --disable-security-limits --robots=0 --timeout=30 --retries=0)
+refdir="${out}/hts-cache/ref"
+
+# --- pass 1: crawl, interrupt once the blob download is underway -------------
+printf '[pass 1: interrupt mid-download] ..\t'
+httrack "${common[@]}" "${base}/resume/index.html" >"${tmpdir}/log1" 2>&1 &
+crawlpid=$!
+# Wait until blob.txt is requested, then SIGTERM so httrack's exit handler
+# finalizes the cache and serializes the temp-ref.
+for _ in $(seq 1 300); do
+    test -s "$counter" && break
+    kill -0 "$crawlpid" 2>/dev/null || break
+    sleep 0.1
+done
+sleep 0.5
+kill -TERM "$crawlpid" 2>/dev/null
+wait "$crawlpid" 2>/dev/null
+crawlpid=
+test -n "$(find "$refdir" -name '*.ref' 2>/dev/null)" || {
+    echo "FAIL: no temp-ref survived pass 1; cannot drive #206"
+    exit 1
+}
+echo "OK (temp-ref present)"
+before=$(wc -c <"$counter" 2>/dev/null || echo 0)
+
+# --- pass 2: --continue -> resume Range -> 416, bounded against the #206 loop -
+# Kill pass 2 after a deadline (portable stand-in for `timeout`, absent on macOS).
+printf '[pass 2: resume must terminate] ..\t'
+HANG_RC=137 # 128 + SIGKILL
+httrack "${common[@]}" --continue "${base}/resume/index.html" >"${tmpdir}/log2" 2>&1 &
+crawlpid=$!
+(sleep 30 && kill -9 "$crawlpid" 2>/dev/null) &
+guard=$!
+rc=0
+wait "$crawlpid" 2>/dev/null || rc=$?
+crawlpid=
+kill "$guard" 2>/dev/null || true
+wait "$guard" 2>/dev/null || true
+if test "$rc" -eq "$HANG_RC"; then
+    echo "FAIL: pass 2 did not terminate (#206 resume->416 loop)"
+    exit 1
+fi
+echo "OK (terminated, rc=$rc)"
+
+# The fix re-gets once (resume Range + range-less re-get = 2): the lower bound
+# rejects a drop-the-link non-fix (1), the upper bound rejects the loop (many).
+after=$(wc -c <"$counter" 2>/dev/null || echo 0)
+hits=$((after - before))
+printf '[bounded re-get count] ..\t'
+if test "$hits" -lt 2; then
+    echo "FAIL: only ${hits} pass-2 request(s); the stale partial was not re-got"
+    exit 1
+fi
+if test "$hits" -gt 8; then
+    echo "FAIL: ${hits} pass-2 requests for blob.txt (resume is looping)"
+    exit 1
+fi
+echo "OK (${hits} requests)"

tests/21_local-intl-update.test

@@ -0,0 +1,11 @@
+#!/bin/bash
+#
+# #157: a dotless, accented URL named .html on the first crawl must keep .html
+# across an update -- not revert to the extensionless name.
+
+: "${top_srcdir:=..}"
+
+bash "$top_srcdir/tests/local-crawl.sh" --errors 0 --rerun \
+    --found 'intl/Instalação_CVS_no_Ubuntu.html' \
+    --not-found 'intl/Instalação_CVS_no_Ubuntu' \
+    httrack 'BASEURL/intl/index.html'

tests/22_local-broken-size.test

@@ -0,0 +1,17 @@
+#!/bin/bash
+# Issues #32/#41: a Content-Length that disagrees with the body warns "bogus
+# state (broken size)" and skips the cache; -%B (tolerant) accepts it.
+
+: "${top_srcdir:=..}"
+
+# Default: warn, but the file is still written.
+bash "$top_srcdir/tests/local-crawl.sh" --errors 0 \
+    --found 'size/oversize.bin' \
+    --log-found 'bogus state \(broken size' \
+    httrack 'BASEURL/size/index.html'
+
+# -%B (tolerant): no warning, file written.
+bash "$top_srcdir/tests/local-crawl.sh" --errors 0 \
+    --found 'size/oversize.bin' \
+    --log-not-found 'bogus state' \
+    httrack 'BASEURL/size/index.html' '-%B'

tests/23_local-errpage.test

@@ -0,0 +1,19 @@
+#!/bin/bash
+# Issue #17: with "no error pages" (-o0), 4xx/5xx bodies must not be written;
+# a genuine 0-byte 200 stays. Default (-o1) writes the error page. (#17's purge
+# half also does not reproduce; the purge path is not exercised here.)
+set -e
+
+: "${top_srcdir:=..}"
+
+# -o0: 404 suppressed, good page and the legit 0-byte 200 kept.
+bash "$top_srcdir/tests/local-crawl.sh" --errors 1 \
+    --found 'errpage/good.html' \
+    --found 'errpage/empty.html' \
+    --not-found 'errpage/missing.html' \
+    httrack 'BASEURL/errpage/index.html' '-o0'
+
+# Control -o1 (default): the 404 error page is written.
+bash "$top_srcdir/tests/local-crawl.sh" --errors 1 \
+    --found 'errpage/missing.html' \
+    httrack 'BASEURL/errpage/index.html' '-o1'

tests/Makefile.am

@@ -26,6 +26,7 @@ TESTS = \
 	00_runnable.test \
 	01_engine-cache.test \
 	01_engine-cache-golden.test \
+	01_engine-cache-writefail.test \
 	01_engine-charset.test \
 	01_engine-cmdline.test \
 	01_engine-cookies.test \
@@ -41,6 +42,7 @@ TESTS = \
 	01_engine-rcfile.test \
 	01_engine-relative.test \
 	01_engine-savename.test \
+	01_engine-selftest-dispatch.test \
 	01_engine-simplify.test \
 	01_engine-strsafe.test \
 	02_manpage-regen.test \
@@ -59,6 +61,10 @@ TESTS = \
 	16_local-assume.test \
 	17_local-empty-ct.test \
 	18_local-update.test \
-	19_local-connect-fallback.test
+	19_local-connect-fallback.test \
+	20_local-resume-loop.test \
+	21_local-intl-update.test \
+	22_local-broken-size.test \
+	23_local-errpage.test
 
 CLEANFILES = check-network_sh.cache

tests/local-crawl.sh

@@ -14,7 +14,9 @@
 # Usage:
 #   bash local-crawl.sh [--tls] [--root DIR] \
 #       --errors N --files N --found PATH ... --directory PATH ... \
+#       --log-found REGEX ... --log-not-found REGEX ... \
 #       httrack BASEURL/some/path [httrack-args...]
+# --log-found/--log-not-found grep (ERE) the crawl's hts-log.txt.
 
 set -u
 
@@ -107,7 +109,7 @@ while test "$pos" -lt "$nargs"; do
         audit+=("${args[$pos]}" "${args[$((pos + 1))]}")
         pos=$((pos + 1))
         ;;
-    --found | --not-found | --directory)
+    --found | --not-found | --directory | --log-found | --log-not-found)
         audit+=("${args[$pos]}" "${args[$((pos + 1))]}")
         pos=$((pos + 1))
         ;;
@@ -196,6 +198,15 @@ if test -n "$rerun"; then
         exit 1
     }
     result "OK (update)"
+    # The update summary reports "files updated"; a fresh crawl never does. Assert
+    # it so a regression that bypasses the cache (re-crawls fresh) can't pass.
+    info "checking update used the cache"
+    if grep -aqE "mirror complete in .*files updated" "${out}/hts-log.txt"; then
+        result "OK"
+    else
+        result "update pass did not report cache activity"
+        exit 1
+    fi
 fi
 
 # --- discover the single host root (127.0.0.1_<port> or 127.0.0.1) -----------
@@ -248,6 +259,22 @@ while test "$i" -lt "${#audit[@]}"; do
             exit 1
         fi
         ;;
+    --log-found)
+        i=$((i + 1))
+        info "checking log matches ${audit[$i]}"
+        if grep -aqE "${audit[$i]}" "${out}/hts-log.txt"; then result "OK"; else
+            result "not in log"
+            exit 1
+        fi
+        ;;
+    --log-not-found)
+        i=$((i + 1))
+        info "checking log lacks ${audit[$i]}"
+        if grep -aqE "${audit[$i]}" "${out}/hts-log.txt"; then
+            result "present in log"
+            exit 1
+        else result "OK"; fi
+        ;;
     esac
     i=$((i + 1))
 done

tests/local-server.py

@@ -15,6 +15,7 @@ stdlib only (http.server + ssl) -- no new build or runtime dependency.
 
 import argparse
 import os
+import time
 from http.server import SimpleHTTPRequestHandler, ThreadingHTTPServer
 from urllib.parse import quote, unquote, urlsplit
 
@@ -176,6 +177,87 @@ class Handler(SimpleHTTPRequestHandler):
         body, ctype = self.TYPE_MATRIX[path]
         self.send_raw(body, ctype)
 
+    # --- special chars in URLs across an update (issue #157) ---------------
+    # A dotless, accented basename served as text/html (MediaWiki style). The
+    # name the first crawl picks (.html) must survive the update pass.
+    INTL_NAME = "Instalação_CVS_no_Ubuntu"
+
+    def route_intl_index(self):
+        self.send_html('\t<a href="%s">accented</a>\n' % self.INTL_NAME)
+
+    def route_intl_page(self):
+        self.send_raw(b"<html><body>accented page</body></html>\n", "text/html")
+
+    # resume / 416 loop (#206): the first GET stalls after a prefix so the crawl
+    # can be interrupted (partial + temp-ref); every later request is 416.
+    RESUME_PREFIX = b"PARTIAL-" + b"x" * 4096  # flushed before the stall
+    RESUME_LEN = len(RESUME_PREFIX) + 4096  # declared length never delivered
+    _resume_started = False
+
+    def route_resume_index(self):
+        self.send_html('\t<a href="blob.txt">blob</a>')
+
+    def route_resume(self):
+        counter = os.environ.get("RESUME_COUNTER")
+        if counter:
+            with open(counter, "a") as fp:
+                fp.write("x")
+        # First GET: stall mid-body so the crawl can be interrupted with a partial.
+        if not Handler._resume_started:
+            Handler._resume_started = True
+            self.send_response(200)
+            self.send_header("Content-Type", "image/png")
+            self.send_header("Content-Length", str(self.RESUME_LEN))
+            self.send_header("Accept-Ranges", "bytes")
+            self.end_headers()
+            if self.command != "HEAD":
+                self.wfile.write(self.RESUME_PREFIX)
+                self.wfile.flush()
+                try:
+                    while True:
+                        time.sleep(3600)
+                except OSError:
+                    pass
+            return
+        self.send_response(416, "Requested Range Not Satisfiable")
+        self.send_header("Content-Type", "image/png")
+        self.send_header("Content-Range", "bytes */%d" % self.RESUME_LEN)
+        self.send_header("Content-Length", "0")
+        self.end_headers()
+
+    # error pages / 0-byte files (#17): -o0 ("no error pages") must keep 4xx/5xx
+    # bodies off disk; a genuine 0-byte 200 is a valid file and stays.
+    def route_errpage_index(self):
+        self.send_html(
+            '\t<a href="good.html">good</a>\n'
+            '\t<a href="missing.html">missing</a>\n'
+            '\t<a href="empty.html">empty</a>\n'
+        )
+
+    def route_errpage_good(self):
+        self.send_raw(b"<html><body>good page</body></html>\n", "text/html")
+
+    def route_errpage_missing(self):
+        self.send_html("\t404 error body", status=404, extra_status="Not Found")
+
+    def route_errpage_empty(self):
+        self.send_raw(b"", "text/html")
+
+    # broken Content-Length (#32/#41): declared size != bytes sent. httrack
+    # warns "bogus state (broken size)" and skips the cache unless -%B.
+    def route_size_index(self):
+        self.send_html('\t<a href="oversize.bin">over</a>\n')
+
+    def route_size_oversize(self):
+        body = b"A" * 100
+        self.send_response(200)
+        self.send_header("Content-Type", "application/octet-stream")
+        self.send_header("Content-Length", str(len(body) - 2))  # lie: too short
+        self.send_header("Connection", "close")
+        self.end_headers()
+        if self.command != "HEAD":
+            self.wfile.write(body)
+
     ROUTES = {
         "/cookies/entrance.php": route_entrance,
         "/cookies/second.php": route_second,
@@ -195,6 +277,16 @@ class Handler(SimpleHTTPRequestHandler):
         "/types/style.css": route_types,
         "/types/data.json": route_types,
         "/types/gen.php": route_types,
+        "/intl/index.html": route_intl_index,
+        "/intl/" + INTL_NAME: route_intl_page,
+        "/resume/index.html": route_resume_index,
+        "/resume/blob.txt": route_resume,
+        "/size/index.html": route_size_index,
+        "/size/oversize.bin": route_size_oversize,
+        "/errpage/index.html": route_errpage_index,
+        "/errpage/good.html": route_errpage_good,
+        "/errpage/missing.html": route_errpage_missing,
+        "/errpage/empty.html": route_errpage_empty,
     }
 
     # --- dispatch ----------------------------------------------------------
@@ -202,7 +294,8 @@ class Handler(SimpleHTTPRequestHandler):
     def dispatch(self):
         self._set_cookies = []
         path = urlsplit(self.path).path
-        handler = self.ROUTES.get(path)
+        # Match percent-encoded paths (accented #157 route) by their decoded form.
+        handler = self.ROUTES.get(path) or self.ROUTES.get(unquote(path))
         if handler is not None:
             handler(self)
             return True