Fix relative links, better resolve "./" and "../" links (Issue #534)

Author: michaelrsweet

CHANGES.md

@@ -2,7 +2,7 @@
 
 - Fixed a regression that caused spaces to disappear between some words
   (Issue #533)
-- Fixed broken links to HTML files in the document (Issue #534)
+- Fixed resolution of relative links within a document (Issue #534)
 
 
 # Changes in HTMLDOC v1.9.19

doc/Makefile

@@ -1,7 +1,7 @@
 #
 # Makefile for HTMLDOC documentation files.
 #
-# Copyright © 2011-2018 by Michael R Sweet.
+# Copyright © 2011-2024 by Michael R Sweet.
 # Copyright © 1997-2010 by Easy Software Products.
 #
 # This program is free software.  Distribution and use rights are outlined in
@@ -80,7 +80,7 @@ htmldoc.d:	$(SOURCES) ../htmldoc/htmldoc$(EXEEXT)
 		$(RM) -r htmldoc.d; \
 	fi
 	$(MKDIR) htmldoc.d
-	$(VALGRIND) $(HTMLDOC) --batch htmldoc.book -t htmlsep -d htmldoc.d
+	$(VALGRIND) $(HTMLDOC) --batch htmldoc.book --strict -t htmlsep -d htmldoc.d
 
 
 #
@@ -89,7 +89,7 @@ htmldoc.d:	$(SOURCES) ../htmldoc/htmldoc$(EXEEXT)
 
 htmldoc.epub:	$(SOURCES) ../htmldoc/htmldoc$(EXEEXT)
 	echo Formatting htmldoc.epub...
-	$(VALGRIND) $(HTMLDOC) --batch htmldoc.book --titleimage htmldoc-cover.png -f htmldoc.epub
+	$(VALGRIND) $(HTMLDOC) --batch htmldoc.book --strict --titleimage htmldoc-cover.png -f htmldoc.epub
 
 
 #
@@ -98,7 +98,7 @@ htmldoc.epub:	$(SOURCES) ../htmldoc/htmldoc$(EXEEXT)
 
 htmldoc.html:	$(SOURCES) ../htmldoc/htmldoc$(EXEEXT)
 	echo Formatting htmldoc.html...
-	$(VALGRIND) $(HTMLDOC) --batch htmldoc.book -f htmldoc.html
+	$(VALGRIND) $(HTMLDOC) --batch htmldoc.book --strict -f htmldoc.html
 
 
 #
@@ -107,7 +107,7 @@ htmldoc.html:	$(SOURCES) ../htmldoc/htmldoc$(EXEEXT)
 
 htmldoc.pdf:	$(SOURCES) ../htmldoc/htmldoc$(EXEEXT)
 	echo Formatting htmldoc.pdf...
-	$(VALGRIND) $(HTMLDOC) --batch htmldoc.book -f htmldoc.pdf
+	$(VALGRIND) $(HTMLDOC) --batch htmldoc.book --strict -f htmldoc.pdf
 
 
 #
@@ -116,4 +116,4 @@ htmldoc.pdf:	$(SOURCES) ../htmldoc/htmldoc$(EXEEXT)
 
 htmldoc.ps:	$(SOURCES) ../htmldoc/htmldoc$(EXEEXT)
 	echo Formatting htmldoc.ps...
-	$(VALGRIND) $(HTMLDOC) --batch htmldoc.book -f htmldoc.ps
+	$(VALGRIND) $(HTMLDOC) --batch htmldoc.book --strict -f htmldoc.ps

htmldoc/htmllib.cxx

@@ -3584,22 +3584,28 @@ htmlFixLinks(tree_t *doc,		// I - Top node
       progress_error(HD_ERROR_NONE, "DEBUG: Updating links in document.");
   }
 
+  DEBUG_printf(("htmlFixLinks: base=\"%s\"\n", (char *)base));
+
   while (tree)
   {
     if (tree->markup == MARKUP_A && base && base[0] &&
         (href = htmlGetVariable(tree, (uchar *)"HREF")) != NULL)
     {
       // Check if the link needs to be localized...
-      if (href[0] != '#' && file_method((char *)href) == NULL &&
-          file_method((char *)base) != NULL &&
-	  htmlFindFile(doc, (uchar *)file_basename((char *)href)) == NULL)
+      DEBUG_printf(("htmlFixLinks: href=\"%s\", file_method(href)=\"%s\", file_method(base)=\"%s\"\\n", (char *)href, file_method((char *)href), file_method((char *)base)));
+
+      if (href[0] != '#' && file_method((char *)href) == NULL)
       {
         // Yes, localize it...
+        DEBUG_puts("htmlFixLinks: Localizing");
+
 	if (href[0] == '/')
 	{
 	  // Absolute URL, just copy scheme, server, etc.
 	  char *ptr;			// Pointer into URL...
 
+          DEBUG_puts("htmlFixLinks: Absolute");
+
 	  strlcpy(full_href, (char *)base, sizeof(full_href));
 
           if (href[1] == '/')
@@ -3608,8 +3614,7 @@ htmlFixLinks(tree_t *doc,		// I - Top node
 	    if ((ptr = strstr(full_href, "//")) != NULL)
 	      *ptr ='\0';
 	  }
-	  else if ((ptr = strstr(full_href, "//")) != NULL  &&
-	           (ptr = strchr(ptr + 2, '/')) != NULL)
+	  else if ((ptr = strstr(full_href, "//")) != NULL && (ptr = strchr(ptr + 2, '/')) != NULL)
 	    *ptr ='\0';
 
 	  strlcat(full_href, (char *)href, sizeof(full_href));
@@ -3618,12 +3623,35 @@ htmlFixLinks(tree_t *doc,		// I - Top node
 	{
 	  // Relative URL of the form "./foo/bar", append href sans
 	  // "./" to base to form full href...
+          DEBUG_puts("htmlFixLinks: Current directory");
+
 	  snprintf(full_href, sizeof(full_href), "%s/%s", base, href + 2);
 	}
+	else if (!strncmp((char *)href, "../", 3))
+	{
+	  // Relative URL of the form "../foo/bar", append href sans
+	  // "../" to parent to form full href...
+	  char parent[1024], *pptr;	// Parent directory
+
+	  strlcpy(parent, (char *)base, sizeof(parent));
+	  if ((pptr = strrchr(parent, '/')) != NULL)
+	    pptr[1] = '\0';
+	  else
+	    parent[0] = '\0';
+
+          DEBUG_printf(("htmlFixLinks: Subdirectory, parent=\"%s\"\n", parent));
+
+	  snprintf(full_href, sizeof(full_href), "%s%s", parent, href + 3);
+	}
 	else
 	{
 	  // Relative URL, append href to base to form full href...
-	  snprintf(full_href, sizeof(full_href), "%s/%s", base, href);
+          DEBUG_puts("htmlFixLinks: Relative");
+
+          if (strcmp((char *)base, "."))
+	    snprintf(full_href, sizeof(full_href), "%s/%s", (char *)base, (char *)href);
+	  else
+	    strlcpy(full_href, (char *)href, sizeof(full_href));
 	}
 
         if (show_debug)

htmldoc/ps-pdf.cxx

@@ -3425,6 +3425,7 @@ pdf_write_links(FILE *out)		/* I - Output file */
 	   /*
             * Local link...
             */
+
             if (link->page < (int)num_pages)
             {
 	      float x1, y1, x2, y2;