Complete the removal of __gconv_translit_find

Prior to the 2.20 release, the function was just changed to fail
unconditionally, in commit a1a6a401ab0a3c9f15fb7eaebbdcee24192254e8.
This commit removes the function completely, including gconv bits
which depend on it.

This changes the gconv ABI, which is not a public interface.

8 files changed, 32 insertions, 255 deletions

diff --git a/iconv/Versions b/iconv/Versions
index 5d50cf1..60ab10a 100644
--- a/iconv/Versions
+++ b/iconv/Versions
@@ -6,5 +6,8 @@ libc {
   GLIBC_PRIVATE {
     # functions shared with iconv program
     __gconv_get_alias_db; __gconv_get_cache; __gconv_get_modules_db;
+
+    # function used by the gconv modules
+    __gconv_transliterate;
   }
 }
diff --git a/iconv/gconv.h b/iconv/gconv.h
index 108dccb..7d59bb0 100644
--- a/iconv/gconv.h
+++ b/iconv/gconv.h
@@ -56,7 +56,8 @@ enum
 {
   __GCONV_IS_LAST = 0x0001,
   __GCONV_IGNORE_ERRORS = 0x0002,
-  __GCONV_SWAP = 0x0004
+  __GCONV_SWAP = 0x0004,
+  __GCONV_TRANSLIT = 0x0008
 };
 
 
@@ -64,7 +65,6 @@ enum
 struct __gconv_step;
 struct __gconv_step_data;
 struct __gconv_loaded_object;
-struct __gconv_trans_data;
 
 
 /* Type of a conversion function.  */
@@ -80,38 +80,6 @@ typedef int (*__gconv_init_fct) (struct __gconv_step *);
 typedef void (*__gconv_end_fct) (struct __gconv_step *);
 
 
-/* Type of a transliteration/transscription function.  */
-typedef int (*__gconv_trans_fct) (struct __gconv_step *,
-				  struct __gconv_step_data *, void *,
-				  const unsigned char *,
-				  const unsigned char **,
-				  const unsigned char *, unsigned char **,
-				  size_t *);
-
-/* Function to call to provide transliteration module with context.  */
-typedef int (*__gconv_trans_context_fct) (void *, const unsigned char *,
-					  const unsigned char *,
-					  unsigned char *, unsigned char *);
-
-/* Function to query module about supported encoded character sets.  */
-typedef int (*__gconv_trans_query_fct) (const char *, const char ***,
-					size_t *);
-
-/* Constructor and destructor for local data for transliteration.  */
-typedef int (*__gconv_trans_init_fct) (void **, const char *);
-typedef void (*__gconv_trans_end_fct) (void *);
-
-struct __gconv_trans_data
-{
-  /* Transliteration/Transscription function.  */
-  __gconv_trans_fct __trans_fct;
-  __gconv_trans_context_fct __trans_context_fct;
-  __gconv_trans_end_fct __trans_end_fct;
-  void *__data;
-  struct __gconv_trans_data *__next;
-};
-
-
 /* Description of a conversion step.  */
 struct __gconv_step
 {
@@ -163,9 +131,6 @@ struct __gconv_step_data
   __mbstate_t *__statep;
   __mbstate_t __state;	/* This element must not be used directly by
 			   any module; always use STATEP!  */
-
-  /* Transliteration information.  */
-  struct __gconv_trans_data *__trans;
 };
 
 
@@ -177,4 +142,13 @@ typedef struct __gconv_info
   __extension__ struct __gconv_step_data __data __flexarr;
 } *__gconv_t;
 
+/* Transliteration using the locale's data.  */
+extern int __gconv_transliterate (struct __gconv_step *step,
+				  struct __gconv_step_data *step_data,
+				  const unsigned char *inbufstart,
+				  const unsigned char **inbufp,
+				  const unsigned char *inbufend,
+				  unsigned char **outbufstart,
+				  size_t *irreversible);
+
 #endif /* gconv.h */
diff --git a/iconv/gconv_close.c b/iconv/gconv_close.c
index 81f0e0b..f6394af 100644
--- a/iconv/gconv_close.c
+++ b/iconv/gconv_close.c
@@ -37,20 +37,6 @@ __gconv_close (__gconv_t cd)
   drunp = cd->__data;
   do
     {
-      struct __gconv_trans_data *transp;
-
-      transp = drunp->__trans;
-      while (transp != NULL)
-	{
-	  struct __gconv_trans_data *curp = transp;
-	  transp = transp->__next;
-
-	  if (__glibc_unlikely (curp->__trans_end_fct != NULL))
-	    curp->__trans_end_fct (curp->__data);
-
-	  free (curp);
-	}
-
       if (!(drunp->__flags & __GCONV_IS_LAST) && drunp->__outbuf != NULL)
 	free (drunp->__outbuf);
     }
diff --git a/iconv/gconv_int.h b/iconv/gconv_int.h
index ace076b..13b0e99 100644
--- a/iconv/gconv_int.h
+++ b/iconv/gconv_int.h
@@ -92,21 +92,6 @@ struct gconv_module
 };
 
 
-/* Internal data structure to represent transliteration module.  */
-struct trans_struct
-{
-  const char *name;
-  struct trans_struct *next;
-
-  const char **csnames;
-  size_t ncsnames;
-  __gconv_trans_fct trans_fct;
-  __gconv_trans_context_fct trans_context_fct;
-  __gconv_trans_init_fct trans_init_fct;
-  __gconv_trans_end_fct trans_end_fct;
-};
-
-
 /* Flags for `gconv_open'.  */
 enum
 {
@@ -258,20 +243,7 @@ extern void __gconv_get_builtin_trans (const char *name,
 				       struct __gconv_step *step)
      internal_function;
 
-/* Try to load transliteration step module.  */
-extern int __gconv_translit_find (struct trans_struct *trans)
-     internal_function;
-
-/* Transliteration using the locale's data.  */
-extern int __gconv_transliterate (struct __gconv_step *step,
-				  struct __gconv_step_data *step_data,
-				  void *trans_data,
-				  const unsigned char *inbufstart,
-				  const unsigned char **inbufp,
-				  const unsigned char *inbufend,
-				  unsigned char **outbufstart,
-				  size_t *irreversible) attribute_hidden;
-
+libc_hidden_proto (__gconv_transliterate)
 
 /* If NAME is an codeset alias expand it.  */
 extern int __gconv_compare_alias (const char *name1, const char *name2)
diff --git a/iconv/gconv_open.c b/iconv/gconv_open.c
index bfbe22b..615f33d 100644
--- a/iconv/gconv_open.c
+++ b/iconv/gconv_open.c
@@ -39,7 +39,7 @@ __gconv_open (const char *toset, const char *fromset, __gconv_t *handle,
   int conv_flags = 0;
   const char *errhand;
   const char *ignore;
-  struct trans_struct *trans = NULL;
+  bool translit = false;
 
   /* Find out whether any error handling method is specified.  */
   errhand = strchr (toset, '/');
@@ -66,72 +66,10 @@ __gconv_open (const char *toset, const char *fromset, __gconv_t *handle,
 	  while (tok != NULL)
 	    {
 	      if (__strcasecmp_l (tok, "TRANSLIT", _nl_C_locobj_ptr) == 0)
-		{
-		  /* It's the builtin transliteration handling.  We only
-		     support it for working on the internal encoding.  */
-		  static const char *const internal_trans_names[1]
-		    = { "INTERNAL" };
-		  struct trans_struct *lastp = NULL;
-		  struct trans_struct *runp;
-
-		  for (runp = trans; runp != NULL; runp = runp->next)
-		    if (runp->trans_fct == __gconv_transliterate)
-		      break;
-		    else
-		      lastp = runp;
-
-		  if (runp == NULL)
-		    {
-		      struct trans_struct *newp;
-
-		      newp = (struct trans_struct *) alloca (sizeof (*newp));
-		      memset (newp, '\0', sizeof (*newp));
-
-		      /* We leave the `name' field zero to signal that
-			 this is an internal transliteration step.  */
-		      newp->csnames = (const char **) internal_trans_names;
-		      newp->ncsnames = 1;
-		      newp->trans_fct = __gconv_transliterate;
-
-		      if (lastp == NULL)
-			trans = newp;
-		      else
-			lastp->next = newp;
-		    }
-		}
+		translit = true;
 	      else if (__strcasecmp_l (tok, "IGNORE", _nl_C_locobj_ptr) == 0)
 		/* Set the flag to ignore all errors.  */
 		conv_flags |= __GCONV_IGNORE_ERRORS;
-	      else
-		{
-		  /* `tok' is possibly a module name.  We'll see later
-		     whether we can find it.  But first see that we do
-		     not already a module of this name.  */
-		  struct trans_struct *lastp = NULL;
-		  struct trans_struct *runp;
-
-		  for (runp = trans; runp != NULL; runp = runp->next)
-		    if (runp->name != NULL
-			&& __strcasecmp_l (tok, runp->name,
-					   _nl_C_locobj_ptr) == 0)
-		      break;
-		    else
-		      lastp = runp;
-
-		  if (runp == NULL)
-		    {
-		      struct trans_struct *newp;
-
-		      newp = (struct trans_struct *) alloca (sizeof (*newp));
-		      memset (newp, '\0', sizeof (*newp));
-		      newp->name = tok;
-
-		      if (lastp == NULL)
-			trans = newp;
-		      else
-			lastp->next = newp;
-		    }
-		}
 
 	      tok = __strtok_r (NULL, ",", &ptr);
 	    }
@@ -172,25 +110,6 @@ __gconv_open (const char *toset, const char *fromset, __gconv_t *handle,
   res = __gconv_find_transform (toset, fromset, &steps, &nsteps, flags);
   if (res == __GCONV_OK)
     {
-      /* Find the modules.  */
-      struct trans_struct *lastp = NULL;
-      struct trans_struct *runp;
-
-      for (runp = trans; runp != NULL; runp = runp->next)
-	{
-	  if (runp->name == NULL
-	      || __builtin_expect (__gconv_translit_find (runp), 0) == 0)
-	    lastp = runp;
-	  else
-	    {
-	      /* This means we haven't found the module.  Remove it.  */
-	      if (lastp == NULL)
-		trans  = runp->next;
-	      else
-		lastp->next  = runp->next;
-	    }
-	}
-
       /* Allocate room for handle.  */
       result = (__gconv_t) malloc (sizeof (struct __gconv_info)
 				   + (nsteps
@@ -199,8 +118,6 @@ __gconv_open (const char *toset, const char *fromset, __gconv_t *handle,
 	res = __GCONV_NOMEM;
       else
 	{
-	  size_t n;
-
 	  /* Remember the list of steps.  */
 	  result->__steps = steps;
 	  result->__nsteps = nsteps;
@@ -228,47 +145,12 @@ __gconv_open (const char *toset, const char *fromset, __gconv_t *handle,
 	      /* We use the `mbstate_t' member in DATA.  */
 	      result->__data[cnt].__statep = &result->__data[cnt].__state;
 
-	      /* Now see whether we can use any of the transliteration
-		 modules for this step.  */
-	      for (runp = trans; runp != NULL; runp = runp->next)
-		for (n = 0; n < runp->ncsnames; ++n)
-		  if (__strcasecmp_l (steps[cnt].__from_name,
-				      runp->csnames[n], _nl_C_locobj_ptr) == 0)
-		    {
-		      void *data = NULL;
-
-		      /* Match!  Now try the initializer.  */
-		      if (runp->trans_init_fct == NULL
-			  || (runp->trans_init_fct (&data,
-						    steps[cnt].__to_name)
-			      == __GCONV_OK))
-			{
-			  /* Append at the end of the list.  */
-			  struct __gconv_trans_data *newp;
-			  struct __gconv_trans_data **lastp;
-
-			  newp = (struct __gconv_trans_data *)
-			    malloc (sizeof (struct __gconv_trans_data));
-			  if (newp == NULL)
-			    {
-			      res = __GCONV_NOMEM;
-			      goto bail;
-			    }
-
-			  newp->__trans_fct = runp->trans_fct;
-			  newp->__trans_context_fct = runp->trans_context_fct;
-			  newp->__trans_end_fct = runp->trans_end_fct;
-			  newp->__data = data;
-			  newp->__next = NULL;
-
-			  lastp = &result->__data[cnt].__trans;
-			  while (*lastp != NULL)
-			    lastp = &(*lastp)->__next;
-
-			  *lastp = newp;
-			}
-		      break;
-		    }
+	      /* The builtin transliteration handling only
+		 supports the internal encoding.  */
+	      if (translit
+		  && __strcasecmp_l (steps[cnt].__from_name,
+				     "INTERNAL", _nl_C_locobj_ptr) == 0)
+		conv_flags |= __GCONV_TRANSLIT;
 
 	      /* If this is the last step we must not allocate an
 		 output buffer.  */
@@ -309,23 +191,7 @@ __gconv_open (const char *toset, const char *fromset, __gconv_t *handle,
 	  if (result != NULL)
 	    {
 	      while (cnt-- > 0)
-		{
-		  struct __gconv_trans_data *transp;
-
-		  transp = result->__data[cnt].__trans;
-		  while (transp != NULL)
-		    {
-		      struct __gconv_trans_data *curp = transp;
-		      transp = transp->__next;
-
-		      if (__glibc_unlikely (curp->__trans_end_fct != NULL))
-			curp->__trans_end_fct (curp->__data);
-
-		      free (curp);
-		    }
-
-		  free (result->__data[cnt].__outbuf);
-		}
+		free (result->__data[cnt].__outbuf);
 
 	      free (result);
 	      result = NULL;
diff --git a/iconv/gconv_trans.c b/iconv/gconv_trans.c
index e0835fc..65b5539 100644
--- a/iconv/gconv_trans.c
+++ b/iconv/gconv_trans.c
@@ -32,7 +32,6 @@
 int
 __gconv_transliterate (struct __gconv_step *step,
 		       struct __gconv_step_data *step_data,
-		       void *trans_data __attribute__ ((unused)),
 		       const unsigned char *inbufstart,
 		       const unsigned char **inbufp,
 		       const unsigned char *inbufend,
@@ -237,13 +236,4 @@ __gconv_transliterate (struct __gconv_step *step,
   /* Haven't found a match.  */
   return __GCONV_ILLEGAL_INPUT;
 }
-
-int
-internal_function
-__gconv_translit_find (struct trans_struct *trans)
-{
-  /* Transliteration module loading has been removed because it never
-     worked as intended and suffered from a security vulnerability.
-     Consequently, this function always fails.  */
-  return 1;
-}
+libc_hidden_def (__gconv_transliterate)
diff --git a/iconv/loop.c b/iconv/loop.c
index a480c0c..f4430ed 100644
--- a/iconv/loop.c
+++ b/iconv/loop.c
@@ -213,8 +213,6 @@
    points.  */
 #define STANDARD_TO_LOOP_ERR_HANDLER(Incr) \
   {									      \
-    struct __gconv_trans_data *trans;					      \
-									      \
     result = __GCONV_ILLEGAL_INPUT;					      \
 									      \
     if (irreversible == NULL)						      \
@@ -227,14 +225,10 @@
     UPDATE_PARAMS;							      \
 									      \
     /* First try the transliteration methods.  */			      \
-    for (trans = step_data->__trans; trans != NULL; trans = trans->__next)    \
-      {									      \
-	result = DL_CALL_FCT (trans->__trans_fct,			      \
-			      (step, step_data, trans->__data, *inptrp,	      \
-			       &inptr, inend, &outptr, irreversible));	      \
-	if (result != __GCONV_ILLEGAL_INPUT)				      \
-	  break;							      \
-      }									      \
+    if ((step_data->__flags & __GCONV_TRANSLIT) != 0)			      \
+      result = __gconv_transliterate					      \
+	(step, step_data, *inptrp,					      \
+	 &inptr, inend, &outptr, irreversible);			      \
 									      \
     REINIT_PARAMS;							      \
 									      \
diff --git a/iconv/skeleton.c b/iconv/skeleton.c
index 73dc186..acd60e2 100644
--- a/iconv/skeleton.c
+++ b/iconv/skeleton.c
@@ -501,8 +501,9 @@ FUNCTION_NAME (struct __gconv_step *step, struct __gconv_step_data *data,
     }
   else
     {
-      /* We preserve the initial values of the pointer variables.  */
-      const unsigned char *inptr = *inptrp;
+      /* We preserve the initial values of the pointer variables,
+	 but only some conversion modules need it.  */
+      const unsigned char *inptr __attribute__ ((__unused__)) = *inptrp;
       unsigned char *outbuf = (__builtin_expect (outbufstart == NULL, 1)
 			       ? data->__outbuf : *outbufstart);
       unsigned char *outend = data->__outbufend;
@@ -592,8 +593,6 @@ FUNCTION_NAME (struct __gconv_step *step, struct __gconv_step_data *data,
 
       while (1)
 	{
-	  struct __gconv_trans_data *trans;
-
 	  /* Remember the start value for this round.  */
 	  inptr = *inptrp;
 	  /* The outbuf buffer is empty.  */
@@ -640,13 +639,6 @@ FUNCTION_NAME (struct __gconv_step *step, struct __gconv_step_data *data,
 	      return status;
 	    }
 
-	  /* Give the transliteration module the chance to store the
-	     original text and the result in case it needs a context.  */
-	  for (trans = data->__trans; trans != NULL; trans = trans->__next)
-	    if (trans->__trans_context_fct != NULL)
-	      DL_CALL_FCT (trans->__trans_context_fct,
-			   (trans->__data, inptr, *inptrp, outstart, outbuf));
-
 	  /* We finished one use of the loops.  */
 	  ++data->__invocation_counter;