Rewrite iconv option parsing [BZ #19519]
diff mbox series

Message ID 20191217235029.GA34814@aloka.lostca.se
State New
Headers show
Series
  • Rewrite iconv option parsing [BZ #19519]
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Commit Message

Arjun Shankar Dec. 17, 2019, 11:50 p.m. UTC
From: Arjun Shankar <arjun@redhat.com>

This commit replaces string manipulation during `iconv_open' and iconv_prog
option parsing with a structured, flag based conversion specification.  In
doing so, it alters the internal `__gconv_open' interface and accordingly
adjusts its uses.

This change fixes several hangs in the iconv program and therefore includes a
new test to exercise iconv_prog options that originally led to these hangs. It
also includes a new regression test for option handling in the iconv function.
---
 iconv/Makefile          |  17 +-
 iconv/Versions          |   1 +
 iconv/gconv_charset.c   | 187 ++++++++++++++++++++++
 iconv/gconv_charset.h   |  60 ++++++--
 iconv/gconv_int.h       |  19 ++-
 iconv/gconv_open.c      |  64 ++------
 iconv/iconv_open.c      |  46 +-----
 iconv/iconv_prog.c      |  63 +++-----
 iconv/tst-iconv-opt.c   | 333 ++++++++++++++++++++++++++++++++++++++++
 iconv/tst-iconv_prog.sh | 278 +++++++++++++++++++++++++++++++++
 intl/dcigettext.c       |  15 +-
 11 files changed, 932 insertions(+), 151 deletions(-)
 create mode 100644 iconv/gconv_charset.c
 create mode 100644 iconv/tst-iconv-opt.c
 create mode 100644 iconv/tst-iconv_prog.sh

Comments

Florian Weimer Dec. 18, 2019, 11:18 a.m. UTC | #1
* Arjun Shankar:

> +/* This function returns a pointer to the last suffix in a conversion code
> +   string.  Valid suffixes matched by this function are of the form: '/' or ','
> +   followed by arbitrary text that doesn't contain '/' or ','.  It does not
> +   edit the string in any way.  The caller is expected to parse the suffix and
> +   advance the string terminator before the next call.  */
> +static char *
> +find_suffix (char *s)
> +{
> +  /* The conversion code is in the form of a triplet, separated by '/' chars.
> +     The third component of the triplet contains suffixes. If we don't have two
> +     slashes, we don't have a suffix.  */
> +
> +  int slash_count = 0;
> +
> +  for (int i = 0; s[i] != '\0'; i++)
> +    if (s[i] == '/')
> +      slash_count++;
> +
> +  if (slash_count < 2)
> +    return NULL;

If the caller advances the string, as described in the function comment,
does this still work?  Won't slash_count drop below 2, causing suffixes
to be ignored?

> +             && (isspace(pc->code[len - 1])

Missing space after isspace.

Thanks,
Florian
Arjun Shankar Dec. 18, 2019, 11:58 a.m. UTC | #2
On Wed, Dec 18, 2019 at 12:18:10PM +0100, Florian Weimer wrote:
> 
> > +/* This function returns a pointer to the last suffix in a conversion code
> > +   string.  Valid suffixes matched by this function are of the form: '/' or ','
> > +   followed by arbitrary text that doesn't contain '/' or ','.  It does not
> > +   edit the string in any way.  The caller is expected to parse the suffix and
> > +   advance the string terminator before the next call.  */
> > +static char *
> > +find_suffix (char *s)
> > +{
> > +  /* The conversion code is in the form of a triplet, separated by '/' chars.
> > +     The third component of the triplet contains suffixes. If we don't have two
> > +     slashes, we don't have a suffix.  */
> > +
> > +  int slash_count = 0;
> > +
> > +  for (int i = 0; s[i] != '\0'; i++)
> > +    if (s[i] == '/')
> > +      slash_count++;
> > +
> > +  if (slash_count < 2)
> > +    return NULL;
> 
> If the caller advances the string, as described in the function comment,
> does this still work?  Won't slash_count drop below 2, causing suffixes
> to be ignored?

I used a less than ideal word, "advance", to describe what happens to the
string terminator. It moves back. i.e. suffixes are found via find_suffix,
then dropped before the next call.

Call 1: "FOO/BAR/HACK,FROB"
                     ^
                     |
                     suffix

Call 2: "FOO/BAR/HACK"
                ^
                |
                suffix

Call 3: "FOO/BAR" (too few '/' characters => no suffix)

I can make the comment clearer by dropping the line:

"The caller is expected to parse the suffix and advance the string terminator
before the next call."

...and replacing it with:

"The caller is expected to parse the suffix and remove it from the string (by
e.g. terminating the string earlier) before the next call."

> > +             && (isspace(pc->code[len - 1])
> 
> Missing space after isspace.

Thanks! I'll add one.

Patch
diff mbox series

diff --git a/iconv/Makefile b/iconv/Makefile
index b7a8f5e0d4..ace9936917 100644
--- a/iconv/Makefile
+++ b/iconv/Makefile
@@ -26,7 +26,7 @@  headers		= iconv.h gconv.h
 routines	= iconv_open iconv iconv_close \
 		  gconv_open gconv gconv_close gconv_db gconv_conf \
 		  gconv_builtin gconv_simple gconv_trans gconv_cache
-routines	+= gconv_dl
+routines	+= gconv_dl gconv_charset
 
 vpath %.c ../locale/programs ../intl
 
@@ -44,7 +44,7 @@  CFLAGS-linereader.c += -DNO_TRANSLITERATION
 CFLAGS-simple-hash.c += -I../locale
 
 tests	= tst-iconv1 tst-iconv2 tst-iconv3 tst-iconv4 tst-iconv5 tst-iconv6 \
-	  tst-iconv7 tst-iconv-mt
+	  tst-iconv7 tst-iconv-mt tst-iconv-opt
 
 others		= iconv_prog iconvconfig
 install-others-programs	= $(inst_bindir)/iconv
@@ -61,6 +61,7 @@  include $(patsubst %,$(..)libof-iterator.mk,$(cpp-srcs-left))
 
 ifeq ($(run-built-tests),yes)
 xtests-special += $(objpfx)test-iconvconfig.out
+tests-special += $(objpfx)tst-iconv_prog.out
 endif
 
 # Make a copy of the file because gconv module names are constructed
@@ -81,6 +82,13 @@  endif
 
 include ../Rules
 
+ifeq ($(run-built-tests),yes)
+LOCALES := en_US.UTF-8
+include ../gen-locales.mk
+
+$(objpfx)tst-iconv-opt.out: $(gen-locales)
+endif
+
 $(inst_bindir)/iconv: $(objpfx)iconv_prog $(+force)
 	$(do-install-program)
 
@@ -95,3 +103,8 @@  $(objpfx)test-iconvconfig.out: /dev/null $(objpfx)iconvconfig
 	 cmp $$tmp $(inst_gconvdir)/gconv-modules.cache; \
 	 rm -f $$tmp) > $@; \
 	$(evaluate-test)
+
+$(objpfx)tst-iconv_prog.out: tst-iconv_prog.sh $(objpfx)iconv_prog
+	$(SHELL) $< $(common-objdir) '$(test-wrapper-env)' \
+		 '$(run-program-env)' > $@; \
+	$(evaluate-test)
diff --git a/iconv/Versions b/iconv/Versions
index 60ab10a277..8a5f4cf780 100644
--- a/iconv/Versions
+++ b/iconv/Versions
@@ -6,6 +6,7 @@  libc {
   GLIBC_PRIVATE {
     # functions shared with iconv program
     __gconv_get_alias_db; __gconv_get_cache; __gconv_get_modules_db;
+    __gconv_open; __gconv_create_spec;
 
     # function used by the gconv modules
     __gconv_transliterate;
diff --git a/iconv/gconv_charset.c b/iconv/gconv_charset.c
new file mode 100644
index 0000000000..71d9b702d3
--- /dev/null
+++ b/iconv/gconv_charset.c
@@ -0,0 +1,187 @@ 
+/* Charset name normalization.
+   Copyright (C) 2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+
+#include <stdlib.h>
+#include <ctype.h>
+#include <locale.h>
+#include <stdbool.h>
+#include <string.h>
+#include <sys/stat.h>
+#include "gconv_int.h"
+#include "gconv_charset.h"
+
+
+/* This function returns a pointer to the last suffix in a conversion code
+   string.  Valid suffixes matched by this function are of the form: '/' or ','
+   followed by arbitrary text that doesn't contain '/' or ','.  It does not
+   edit the string in any way.  The caller is expected to parse the suffix and
+   advance the string terminator before the next call.  */
+static char *
+find_suffix (char *s)
+{
+  /* The conversion code is in the form of a triplet, separated by '/' chars.
+     The third component of the triplet contains suffixes. If we don't have two
+     slashes, we don't have a suffix.  */
+
+  int slash_count = 0;
+
+  for (int i = 0; s[i] != '\0'; i++)
+    if (s[i] == '/')
+      slash_count++;
+
+  if (slash_count < 2)
+    return NULL;
+
+  char *last_slash = strrchr (s, '/');
+  char *last_comma = strrchr (s, ',');
+
+  /* Which of the two comes later?  */
+  if ((last_slash != NULL)
+      && (last_comma != NULL))
+    return (last_slash > last_comma) ? last_slash : last_comma;
+
+  return (last_slash != NULL) ? last_slash : last_comma;
+}
+
+
+/* This function parses an iconv_open encoding (tocode or fromcode).  It strips
+   any suffixes (such as TRANSLIT or IGNORE) from the code, and if it passed a
+   non-NULL conv_spec, it turns on the corresponding flag(s) in it.
+   The function returns 0 on success and non-zero on allocation failure.  */
+static int
+gconv_parse_code (struct gconv_parsed_code *pc, const char *code)
+{
+  pc->code = __strdup (code);
+  if (pc->code == NULL)
+    return 1;
+
+  pc->translit = false;
+  pc->ignore = false;
+
+  while (1)
+    {
+      /* First drop any trailing whitespaces and separators.  */
+      size_t len = strlen (pc->code);
+      while ((len > 0)
+             && (isspace(pc->code[len - 1])
+                 || pc->code[len - 1] == ','
+                 || pc->code[len - 1] == '/'))
+        {
+          pc->code[len - 1] = '\0';
+          len--;
+        }
+
+      char * suffix = find_suffix (pc->code);
+      if (suffix == NULL)
+        {
+          /* At this point, the remaining code is (a) suffix free, and (b)
+             not a file.  */
+          return 0;
+        }
+      else
+        {
+          /* The SUFFIX is an index into the CODE character array and
+             points to one past the end of the code and any unprocessed
+             suffixes and to the beginning of the suffix being processed
+             during this iteration.  We must process SUFFIX and then
+             terminate the preceding text so that it isn't encountered
+             during the next iteration.
+
+             We want to allow and recognize suffixes such as:
+
+             "/TRANSLIT"         i.e. single suffix
+             "//TRANSLIT"        i.e. single suffix and multiple separators
+             "//TRANSLIT/IGNORE" i.e. suffixes separated by "/"
+             "/TRANSLIT//IGNORE" i.e. suffixes separated by "//"
+             "//IGNORE,TRANSLIT" i.e. suffixes separated by ","
+             "//IGNORE,"         i.e. trailing ","
+             "//TRANSLIT/"       i.e. trailing "/"
+             "//TRANSLIT//"      i.e. trailing "//"
+             "/"                 i.e. empty suffix.
+
+             Unknown suffixes are silently discarded and ignored.  */
+
+          if ((__strcasecmp_l (suffix,
+                               GCONV_TRIPLE_SEPARATOR
+                               GCONV_TRANSLIT_SUFFIX,
+                               _nl_C_locobj_ptr) == 0)
+              || (__strcasecmp_l (suffix,
+                                  GCONV_SUFFIX_SEPARATOR
+                                  GCONV_TRANSLIT_SUFFIX,
+                                  _nl_C_locobj_ptr) == 0))
+            pc->translit = true;
+
+          if ((__strcasecmp_l (suffix,
+                               GCONV_TRIPLE_SEPARATOR
+                               GCONV_IGNORE_ERRORS_SUFFIX,
+                               _nl_C_locobj_ptr) == 0)
+              || (__strcasecmp_l (suffix,
+                                  GCONV_SUFFIX_SEPARATOR
+                                  GCONV_IGNORE_ERRORS_SUFFIX,
+                                  _nl_C_locobj_ptr) == 0))
+            pc->ignore = true;
+
+          suffix[0] = '\0';
+        }
+    }
+}
+
+
+struct gconv_spec *
+__gconv_create_spec (struct gconv_spec *conv_spec, const char *fromcode,
+                   const char *tocode)
+{
+  struct gconv_parsed_code pfc, ptc;
+
+  int ret = gconv_parse_code (&pfc, fromcode);
+  if (ret != 0)
+    return NULL;
+
+  ret = gconv_parse_code (&ptc, tocode);
+  if (ret != 0)
+    return NULL;
+
+  conv_spec->translit = ptc.translit;
+  conv_spec->ignore = ptc.ignore;
+
+  /* 3 extra bytes because 1 extra for '\0', and 2 extra so strip might
+     be able to add one or two trailing '/' characters if necessary.  */
+  conv_spec->fromcode = malloc (strlen (fromcode) + 3);
+  conv_spec->tocode = malloc (strlen (tocode) + 3);
+
+  if ((conv_spec->fromcode == NULL)
+      || (conv_spec->tocode == NULL))
+    {
+      free (conv_spec->fromcode);
+      free (conv_spec->tocode);
+      return NULL;
+    }
+
+  /* Strip unrecognized characters and ensure that the code has two '/'
+     characters as per conversion code triplet specification.  */
+  strip (conv_spec->fromcode, pfc.code);
+  strip (conv_spec->tocode, ptc.code);
+
+  /* These were allocated by gconv_parse_code.  */
+  free (pfc.code);
+  free (ptc.code);
+
+  return conv_spec;
+}
+libc_hidden_def (__gconv_create_spec)
diff --git a/iconv/gconv_charset.h b/iconv/gconv_charset.h
index 6fbfc34bd8..e623fdf88f 100644
--- a/iconv/gconv_charset.h
+++ b/iconv/gconv_charset.h
@@ -19,9 +19,52 @@ 
 
 #include <ctype.h>
 #include <locale.h>
+#include <stdbool.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <stdlib.h>
+#include "gconv_int.h"
 
 
-static void
+/* An iconv encoding is in the form of a triplet, with parts separated by
+   a '/' character.  The third part comprises of a ',' or '/' separated
+   list of suffixes.  Currently, we support "TRANSLIT" for transliteration
+   and "IGNORE" for ignoring conversion errors due to unrecognized input
+   characters.  */
+#define GCONV_TRIPLE_SEPARATOR "/"
+#define GCONV_SUFFIX_SEPARATOR ","
+#define GCONV_TRANSLIT_SUFFIX "TRANSLIT"
+#define GCONV_IGNORE_ERRORS_SUFFIX "IGNORE"
+
+
+struct gconv_parsed_code
+{
+  char *code;
+  bool translit;
+  bool ignore;
+};
+
+
+struct gconv_spec *
+__gconv_create_spec (struct gconv_spec *conv_spec, const char *fromcode,
+                     const char *tocode);
+libc_hidden_proto (__gconv_create_spec)
+
+static void __attribute__ ((unused))
+gconv_destroy_spec (struct gconv_spec *conv_spec)
+{
+  free (conv_spec->fromcode);
+  free (conv_spec->tocode);
+  return;
+}
+
+
+/* This function copies in-order, characters from the source 's' that are
+   either alpha-numeric or one in one of these: "_-.,:/" - into the destination
+   'wp' while dropping all other characters.  In the process, it converts all
+   alphabetical characters to upper case.  It then appends up to two '/'
+   characters so that the total number of '/'es in the destination is 2.  */
+static inline void __attribute__ ((unused, always_inline))
 strip (char *wp, const char *s)
 {
   int slash_count = 0;
@@ -29,14 +72,13 @@  strip (char *wp, const char *s)
   while (*s != '\0')
     {
       if (__isalnum_l (*s, _nl_C_locobj_ptr)
-	  || *s == '_' || *s == '-' || *s == '.' || *s == ',' || *s == ':')
-	*wp++ = __toupper_l (*s, _nl_C_locobj_ptr);
-      else if (*s == '/')
-	{
-	  if (++slash_count == 3)
-	    break;
-	  *wp++ = '/';
-	}
+          || *s == '_' || *s == '-' || *s == '.' || *s == ',' || *s == ':'
+          || *s == '/')
+        *wp++ = __toupper_l (*s, _nl_C_locobj_ptr);
+
+      if (*s == '/')
+        slash_count++;
+
       ++s;
     }
 
diff --git a/iconv/gconv_int.h b/iconv/gconv_int.h
index c5783ef550..b83de22061 100644
--- a/iconv/gconv_int.h
+++ b/iconv/gconv_int.h
@@ -75,6 +75,15 @@  struct gconv_module
 };
 
 
+/* The specification of the conversion that needs to be performed.  */
+struct gconv_spec
+{
+  char *fromcode;
+  char *tocode;
+  bool translit;
+  bool ignore;
+};
+
 /* Flags for `gconv_open'.  */
 enum
 {
@@ -136,10 +145,12 @@  __libc_lock_define (extern, __gconv_lock attribute_hidden)
   })
 
 
-/* Return in *HANDLE decriptor for transformation from FROMSET to TOSET.  */
-extern int __gconv_open (const char *toset, const char *fromset,
-			 __gconv_t *handle, int flags)
-     attribute_hidden;
+/* Return in *HANDLE, a decriptor for the transformation.  The function expects
+   the specification of the transformation in the structure pointed to by
+   CONV_SPEC.  It only reads *CONV_SPEC and does not take ownership of it.  */
+extern int __gconv_open (struct gconv_spec *conv_spec,
+                         __gconv_t *handle, int flags);
+libc_hidden_proto (__gconv_open)
 
 /* Free resources associated with transformation descriptor CD.  */
 extern int __gconv_close (__gconv_t cd)
diff --git a/iconv/gconv_open.c b/iconv/gconv_open.c
index eeeed57082..8a8e1ee614 100644
--- a/iconv/gconv_open.c
+++ b/iconv/gconv_open.c
@@ -31,7 +31,7 @@ 
 
 
 int
-__gconv_open (const char *toset, const char *fromset, __gconv_t *handle,
+__gconv_open (struct gconv_spec *conv_spec, __gconv_t *handle,
 	      int flags)
 {
   struct __gconv_step *steps;
@@ -40,77 +40,38 @@  __gconv_open (const char *toset, const char *fromset, __gconv_t *handle,
   size_t cnt = 0;
   int res;
   int conv_flags = 0;
-  const char *errhand;
-  const char *ignore;
   bool translit = false;
+  char *tocode, *fromcode;
 
   /* Find out whether any error handling method is specified.  */
-  errhand = strchr (toset, '/');
-  if (errhand != NULL)
-    errhand = strchr (errhand + 1, '/');
-  if (__glibc_likely (errhand != NULL))
-    {
-      if (*++errhand == '\0')
-	errhand = NULL;
-      else
-	{
-	  /* Make copy without the error handling description.  */
-	  char *newtoset = (char *) alloca (errhand - toset + 1);
-	  char *tok;
-	  char *ptr = NULL /* Work around a bogus warning */;
-
-	  newtoset[errhand - toset] = '\0';
-	  toset = memcpy (newtoset, toset, errhand - toset);
+  translit = conv_spec->translit;
 
-	  /* Find the appropriate transliteration handlers.  */
-	  tok = strdupa (errhand);
+  if (conv_spec->ignore)
+    conv_flags |= __GCONV_IGNORE_ERRORS;
 
-	  tok = __strtok_r (tok, ",", &ptr);
-	  while (tok != NULL)
-	    {
-	      if (__strcasecmp_l (tok, "TRANSLIT", _nl_C_locobj_ptr) == 0)
-		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;
-
-	      tok = __strtok_r (NULL, ",", &ptr);
-	    }
-	}
-    }
-
-  /* For the source character set we ignore the error handler specification.
-     XXX Is this really always the best?  */
-  ignore = strchr (fromset, '/');
-  if (ignore != NULL && (ignore = strchr (ignore + 1, '/')) != NULL
-      && *++ignore != '\0')
-    {
-      char *newfromset = (char *) alloca (ignore - fromset + 1);
-
-      newfromset[ignore - fromset] = '\0';
-      fromset = memcpy (newfromset, fromset, ignore - fromset);
-    }
+  tocode = conv_spec->tocode;
+  fromcode = conv_spec->fromcode;
 
   /* If the string is empty define this to mean the charset of the
      currently selected locale.  */
-  if (strcmp (toset, "//") == 0)
+  if (strcmp (tocode, "//") == 0)
     {
       const char *codeset = _NL_CURRENT (LC_CTYPE, CODESET);
       size_t len = strlen (codeset);
       char *dest;
-      toset = dest = (char *) alloca (len + 3);
+      tocode = dest = (char *) alloca (len + 3);
       memcpy (__mempcpy (dest, codeset, len), "//", 3);
     }
-  if (strcmp (fromset, "//") == 0)
+  if (strcmp (fromcode, "//") == 0)
     {
       const char *codeset = _NL_CURRENT (LC_CTYPE, CODESET);
       size_t len = strlen (codeset);
       char *dest;
-      fromset = dest = (char *) alloca (len + 3);
+      fromcode = dest = (char *) alloca (len + 3);
       memcpy (__mempcpy (dest, codeset, len), "//", 3);
     }
 
-  res = __gconv_find_transform (toset, fromset, &steps, &nsteps, flags);
+  res = __gconv_find_transform (tocode, fromcode, &steps, &nsteps, flags);
   if (res == __GCONV_OK)
     {
       /* Allocate room for handle.  */
@@ -209,3 +170,4 @@  __gconv_open (const char *toset, const char *fromset, __gconv_t *handle,
   *handle = result;
   return res;
 }
+libc_hidden_def (__gconv_open)
diff --git a/iconv/iconv_open.c b/iconv/iconv_open.c
index 018af29559..c603929098 100644
--- a/iconv/iconv_open.c
+++ b/iconv/iconv_open.c
@@ -31,49 +31,15 @@ 
 iconv_t
 iconv_open (const char *tocode, const char *fromcode)
 {
-  /* Normalize the name.  We remove all characters beside alpha-numeric,
-     '_', '-', '/', '.', and ':'.  */
-  size_t tocode_len = strlen (tocode) + 3;
-  char *tocode_conv;
-  bool tocode_usealloca = __libc_use_alloca (tocode_len);
-  if (tocode_usealloca)
-    tocode_conv = (char *) alloca (tocode_len);
-  else
-    {
-      tocode_conv = (char *) malloc (tocode_len);
-      if (tocode_conv == NULL)
-	return (iconv_t) -1;
-    }
-  strip (tocode_conv, tocode);
-  tocode = (tocode_conv[2] == '\0' && tocode[0] != '\0'
-	    ? upstr (tocode_conv, tocode) : tocode_conv);
+  __gconv_t cd;
+  struct gconv_spec conv_spec;
 
-  size_t fromcode_len = strlen (fromcode) + 3;
-  char *fromcode_conv;
-  bool fromcode_usealloca = __libc_use_alloca (fromcode_len);
-  if (fromcode_usealloca)
-    fromcode_conv = (char *) alloca (fromcode_len);
-  else
-    {
-      fromcode_conv = (char *) malloc (fromcode_len);
-      if (fromcode_conv == NULL)
-	{
-	  if (! tocode_usealloca)
-	    free (tocode_conv);
-	  return (iconv_t) -1;
-	}
-    }
-  strip (fromcode_conv, fromcode);
-  fromcode = (fromcode_conv[2] == '\0' && fromcode[0] != '\0'
-	      ? upstr (fromcode_conv, fromcode) : fromcode_conv);
+  if (__gconv_create_spec (&conv_spec, fromcode, tocode) == NULL)
+    return (iconv_t) -1;
 
-  __gconv_t cd;
-  int res = __gconv_open (tocode, fromcode, &cd, 0);
+  int res = __gconv_open (&conv_spec, &cd, 0);
 
-  if (! fromcode_usealloca)
-    free (fromcode_conv);
-  if (! tocode_usealloca)
-    free (tocode_conv);
+  gconv_destroy_spec (&conv_spec);
 
   if (__builtin_expect (res, __GCONV_OK) != __GCONV_OK)
     {
diff --git a/iconv/iconv_prog.c b/iconv/iconv_prog.c
index c3660ea998..d8bbbae27f 100644
--- a/iconv/iconv_prog.c
+++ b/iconv/iconv_prog.c
@@ -39,6 +39,7 @@ 
 #include <gconv_int.h>
 #include "iconv_prog.h"
 #include "iconvconfig.h"
+#include "gconv_charset.h"
 
 /* Get libc version number.  */
 #include "../version.h"
@@ -118,8 +119,7 @@  main (int argc, char *argv[])
 {
   int status = EXIT_SUCCESS;
   int remaining;
-  iconv_t cd;
-  const char *orig_to_code;
+  __gconv_t cd;
   struct charmap_t *from_charmap = NULL;
   struct charmap_t *to_charmap = NULL;
 
@@ -139,39 +139,6 @@  main (int argc, char *argv[])
       exit (EXIT_SUCCESS);
     }
 
-  /* If we have to ignore errors make sure we use the appropriate name for
-     the to-character-set.  */
-  orig_to_code = to_code;
-  if (omit_invalid)
-    {
-      const char *errhand = strchrnul (to_code, '/');
-      int nslash = 2;
-      char *newp;
-      char *cp;
-
-      if (*errhand == '/')
-	{
-	  --nslash;
-	  errhand = strchrnul (errhand + 1, '/');
-
-	  if (*errhand == '/')
-	    {
-	      --nslash;
-	      errhand = strchr (errhand, '\0');
-	    }
-	}
-
-      newp = (char *) alloca (errhand - to_code + nslash + 7 + 1);
-      cp = mempcpy (newp, to_code, errhand - to_code);
-      while (nslash-- > 0)
-	*cp++ = '/';
-      if (cp[-1] != '/')
-	*cp++ = ',';
-      memcpy (cp, "IGNORE", sizeof ("IGNORE"));
-
-      to_code = newp;
-    }
-
   /* POSIX 1003.2b introduces a silly thing: the arguments to -t anf -f
      can be file names of charmaps.  In this case iconv will have to read
      those charmaps and use them to do the conversion.  But there are
@@ -184,10 +151,10 @@  main (int argc, char *argv[])
        file.  */
     from_charmap = charmap_read (from_code, /*0, 1*/1, 0, 0, 0);
 
-  if (strchr (orig_to_code, '/') != NULL)
+  if (strchr (to_code, '/') != NULL)
     /* The to-name might be a charmap file name.  Try reading the
        file.  */
-    to_charmap = charmap_read (orig_to_code, /*0, 1,*/1, 0, 0, 0);
+    to_charmap = charmap_read (to_code, /*0, 1,*/1, 0, 0, 0);
 
 
   /* At this point we have to handle two cases.  The first one is
@@ -201,9 +168,25 @@  main (int argc, char *argv[])
 				 argc, remaining, argv, output_file);
   else
     {
+      struct gconv_spec conv_spec;
+      int res;
+
+      if (__gconv_create_spec (&conv_spec, from_code, to_code) == NULL)
+        {
+          error (EXIT_FAILURE, errno,
+                 _("failed to start conversion processing"));
+          exit (1);
+        }
+
+      if (omit_invalid)
+        conv_spec.ignore = true;
+
       /* Let's see whether we have these coded character sets.  */
-      cd = iconv_open (to_code, from_code);
-      if (cd == (iconv_t) -1)
+      res = __gconv_open (&conv_spec, &cd, 0);
+
+      gconv_destroy_spec (&conv_spec);
+
+      if (res != __GCONV_OK)
 	{
 	  if (errno == EINVAL)
 	    {
@@ -221,7 +204,7 @@  main (int argc, char *argv[])
 	      const char *from_pretty =
 		(from_code[0] ? from_code : nl_langinfo (CODESET));
 	      const char *to_pretty =
-		(orig_to_code[0] ? orig_to_code : nl_langinfo (CODESET));
+		(to_code[0] ? to_code : nl_langinfo (CODESET));
 
 	      if (from_wrong)
 		{
diff --git a/iconv/tst-iconv-opt.c b/iconv/tst-iconv-opt.c
new file mode 100644
index 0000000000..bd3ac242ab
--- /dev/null
+++ b/iconv/tst-iconv-opt.c
@@ -0,0 +1,333 @@ 
+/* Test iconv's TRANSLIT and IGNORE option handling
+
+   Copyright (C) 2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+
+#include <iconv.h>
+#include <locale.h>
+#include <errno.h>
+#include <string.h>
+#include <support/support.h>
+#include <support/check.h>
+
+
+/* Run one iconv test.  Arguments:
+   to: destination character set and options
+   from: source character set
+   input: input string to be converted
+   exp_in: expected number of bytes consumed
+   exp_ret: expected return value (error or number of irreversible conversions)
+   exp_out: expected output string
+   exp_err: expected value of `errno' after iconv returns.  */
+static void
+test_iconv (const char *to, const char *from, char *input, size_t exp_in,
+            size_t exp_ret, const char *exp_out, int exp_err)
+{
+  iconv_t cd;
+  char outbuf[500];
+  size_t inlen, outlen;
+  char *inptr, *outptr;
+  size_t n;
+
+  cd = iconv_open (to, from);
+  TEST_VERIFY (cd != (iconv_t) -1);
+
+  inlen = strlen (input);
+  outlen = sizeof (outbuf);
+  inptr = input;
+  outptr = outbuf;
+
+  errno = 0;
+  n = iconv (cd, &inptr, &inlen, &outptr, &outlen);
+
+  TEST_VERIFY (n == exp_ret);
+  TEST_VERIFY (inptr == input + exp_in);
+  TEST_VERIFY (errno == exp_err);
+  TEST_VERIFY (memcmp (outbuf, exp_out, strlen (exp_out)) == 0);
+  TEST_VERIFY (outptr == outbuf + strlen (exp_out));
+  TEST_VERIFY (iconv_close (cd) == 0);
+}
+
+
+/* We test option parsing by converting UTF-8 inputs to ASCII under various
+   option combinations. The UTF-8 inputs fall into three categories:
+   - ASCII-only,
+   - non-ASCII,
+   - non-ASCII with invalid UTF-8 characters.  */
+
+/* 1.  */
+char ascii[] = "Just some ASCII text";
+
+/* 2. Valid UTF-8 input and some corresponding expected outputs with various
+   options.  The two non-ASCII characters below are accented alphabets:
+   an `a' then an `o'.  */
+char utf8[] = "UTF-8 text with \u00E1 couple \u00F3f non-ASCII characters";
+char u2a[] = "UTF-8 text with ";
+char u2a_translit[] = "UTF-8 text with a couple of non-ASCII characters";
+char u2a_ignore[] = "UTF-8 text with  couple f non-ASCII characters";
+
+/* 3. Invalid UTF-8 input and some corresponding expected outputs.  \xff is
+   invalid UTF-8. It's followed by some valid but non-ASCII UTF-8.  */
+char iutf8[] = "Invalid UTF-8 \xff\u27E6text\u27E7";
+char iu2a[] = "Invalid UTF-8 ";
+char iu2a_ignore[] = "Invalid UTF-8 text";
+char iu2a_both[] = "Invalid UTF-8 [|text|]";
+
+/* 4. Another invalid UTF-8 input and corresponding expected outputs. This time
+   the valid non-ASCII UTF-8 characters appear before the invalid \xff.  */
+char jutf8[] = "Invalid \u27E6UTF-8\u27E7 \xfftext";
+char ju2a[] = "Invalid ";
+char ju2a_translit[] = "Invalid [|UTF-8|] ";
+char ju2a_ignore[] = "Invalid UTF-8 text";
+char ju2a_both[] = "Invalid [|UTF-8|] text";
+
+/* We also test option handling for character set names that have the form
+   "A/B".  In this test, we test conversions "ISO-10646/UTF-8", and either
+   ISO-8859-1 or ASCII.  */
+
+/* 5. Accented 'A' and 'a' characters in ISO-8859-1 and UTF-8, and an
+   equivalent ASCII transliteration.  */
+char iso8859_1_a[] = {0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, /* Accented A's.  */
+                      0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, /* Accented a's.  */
+                      0x00};
+char utf8_a[] = "\u00C0\u00C1\u00C2\u00C3\u00C4\u00C5"
+                "\u00E0\u00E1\u00E2\u00E3\u00E4\u00E5";
+char ascii_a[] = "AAAAAAaaaaaa";
+
+/* 6. An invalid ASCII string where [0] is invalid and [1] is '~'.  */
+char iascii [] = {0x80, '~', '\0'};
+char empty[] = "";
+char ia2u_ignore[] = "~";
+
+static int
+do_test (void)
+{
+  xsetlocale (LC_ALL, "en_US.UTF-8");
+
+
+  /* 0. iconv_open should gracefully fail for invalid character sets.  */
+
+  TEST_VERIFY (iconv_open ("INVALID", "UTF-8") == (iconv_t) -1);
+  TEST_VERIFY (iconv_open ("UTF-8", "INVALID") == (iconv_t) -1);
+  TEST_VERIFY (iconv_open ("INVALID", "INVALID") == (iconv_t) -1);
+
+
+  /* 1. ASCII-only UTF-8 input should convert to ASCII with no changes:  */
+
+  test_iconv ("ASCII", "UTF-8", ascii, strlen (ascii), 0, ascii, 0);
+  test_iconv ("ASCII//", "UTF-8", ascii, strlen (ascii), 0, ascii, 0);
+  test_iconv ("ASCII//TRANSLIT", "UTF-8", ascii, strlen (ascii), 0, ascii, 0);
+  test_iconv ("ASCII//TRANSLIT//", "UTF-8", ascii, strlen (ascii), 0, ascii,
+              0);
+  test_iconv ("ASCII//IGNORE", "UTF-8", ascii, strlen (ascii), 0, ascii, 0);
+  test_iconv ("ASCII//IGNORE//", "UTF-8", ascii, strlen (ascii), 0, ascii, 0);
+
+
+  /* 2. Valid UTF-8 input with non-ASCII characters:  */
+
+  /* EILSEQ when converted to ASCII.  */
+  test_iconv ("ASCII", "UTF-8", utf8, strlen (u2a), (size_t) -1, u2a, EILSEQ);
+
+  /* Converted without error with TRANSLIT enabled.  */
+  test_iconv ("ASCII//TRANSLIT", "UTF-8", utf8, strlen (utf8), 2, u2a_translit,
+              0);
+
+  /* EILSEQ with IGNORE enabled.  Non-ASCII chars dropped from output.  */
+  test_iconv ("ASCII//IGNORE", "UTF-8", utf8, strlen (utf8), (size_t) -1,
+              u2a_ignore, EILSEQ);
+
+  /* With TRANSLIT and IGNORE enabled, transliterated without error.  We test
+     four combinations.  */
+
+  test_iconv ("ASCII//TRANSLIT,IGNORE", "UTF-8", utf8, strlen (utf8), 2,
+              u2a_translit, 0);
+  test_iconv ("ASCII//TRANSLIT//IGNORE", "UTF-8", utf8, strlen (utf8), 2,
+              u2a_translit, 0);
+  test_iconv ("ASCII//IGNORE,TRANSLIT", "UTF-8", utf8, strlen (utf8), 2,
+              u2a_translit, 0);
+  /* Due to bug 19519, iconv was ignoring TRANSLIT for the following input.  */
+  test_iconv ("ASCII//IGNORE//TRANSLIT", "UTF-8", utf8, strlen (utf8), 2,
+              u2a_translit, 0);
+
+  /* Misspellings of TRANSLIT and IGNORE are ignored, but conversion still
+     works while respecting any other correctly spelled options.  */
+
+  test_iconv ("ASCII//T", "UTF-8", utf8, strlen (u2a), (size_t) -1, u2a,
+              EILSEQ);
+  test_iconv ("ASCII//TRANSLITERATE", "UTF-8", utf8, strlen (u2a), (size_t) -1,
+              u2a, EILSEQ);
+  test_iconv ("ASCII//I", "UTF-8", utf8, strlen (u2a), (size_t) -1, u2a,
+              EILSEQ);
+  test_iconv ("ASCII//IGNORED", "UTF-8", utf8, strlen (u2a), (size_t) -1, u2a,
+              EILSEQ);
+  test_iconv ("ASCII//TRANSLITERATE//IGNORED", "UTF-8", utf8, strlen (u2a),
+              (size_t) -1, u2a, EILSEQ);
+  test_iconv ("ASCII//IGNORED,TRANSLITERATE", "UTF-8", utf8, strlen (u2a),
+              (size_t) -1, u2a, EILSEQ);
+  test_iconv ("ASCII//T//I", "UTF-8", utf8, strlen (u2a), (size_t) -1, u2a,
+              EILSEQ);
+
+  test_iconv ("ASCII//TRANSLIT//I", "UTF-8", utf8, strlen (utf8), 2,
+              u2a_translit, 0);
+  /* Due to bug 19519, iconv was ignoring TRANSLIT for the following input.  */
+  test_iconv ("ASCII//I//TRANSLIT", "UTF-8", utf8, strlen (utf8), 2,
+              u2a_translit, 0);
+  test_iconv ("ASCII//IGNORED,TRANSLIT", "UTF-8", utf8, strlen (utf8), 2,
+              u2a_translit, 0);
+  test_iconv ("ASCII//TRANSLIT,IGNORED", "UTF-8", utf8, strlen (utf8), 2,
+              u2a_translit, 0);
+
+  test_iconv ("ASCII//IGNORE,T", "UTF-8", utf8, strlen (utf8), (size_t) -1,
+              u2a_ignore, EILSEQ);
+  test_iconv ("ASCII//T,IGNORE", "UTF-8", utf8, strlen (utf8), (size_t) -1,
+              u2a_ignore, EILSEQ);
+  /* Due to bug 19519, iconv was ignoring IGNORE for the following input.  */
+  test_iconv ("ASCII//TRANSLITERATE//IGNORE", "UTF-8", utf8, strlen (utf8),
+              (size_t) -1, u2a_ignore, EILSEQ);
+  test_iconv ("ASCII//IGNORE//TRANSLITERATE", "UTF-8", utf8, strlen (utf8),
+              (size_t) -1, u2a_ignore, EILSEQ);
+
+
+  /* 3. Invalid UTF-8 followed by some valid non-ASCII UTF-8 characters:  */
+
+  /* EILSEQ; output is truncated at the first invalid UTF-8 character.  */
+  test_iconv ("ASCII", "UTF-8", iutf8, strlen (iu2a), (size_t) -1, iu2a,
+              EILSEQ);
+
+  /* With TRANSLIT enabled: EILSEQ; output still truncated at the first invalid
+     UTF-8 character.  */
+  test_iconv ("ASCII//TRANSLIT", "UTF-8", iutf8, strlen (iu2a), (size_t) -1,
+              iu2a, EILSEQ);
+
+  /* With IGNORE enabled: EILSEQ; output omits invalid UTF-8 characters and
+     valid UTF-8 non-ASCII characters.  */
+  test_iconv ("ASCII//IGNORE", "UTF-8", iutf8, strlen (iutf8), (size_t) -1,
+              iu2a_ignore, EILSEQ);
+
+  /* With TRANSLIT and IGNORE enabled, output omits only invalid UTF-8
+     characters and transliterates valid non-ASCII UTF-8 characters.  We test
+     four combinations.  */
+
+  test_iconv ("ASCII//TRANSLIT,IGNORE", "UTF-8", iutf8, strlen (iutf8), 2,
+              iu2a_both, 0);
+  /* Due to bug 19519, iconv was ignoring IGNORE for the following input.  */
+  test_iconv ("ASCII//TRANSLIT//IGNORE", "UTF-8", iutf8, strlen (iutf8), 2,
+              iu2a_both, 0);
+  test_iconv ("ASCII//IGNORE,TRANSLIT", "UTF-8", iutf8, strlen (iutf8), 2,
+              iu2a_both, 0);
+  /* Due to bug 19519, iconv was ignoring TRANSLIT for the following input.  */
+  test_iconv ("ASCII//IGNORE//TRANSLIT", "UTF-8", iutf8, strlen (iutf8), 2,
+              iu2a_both, 0);
+
+
+  /* 4. Invalid UTF-8 with valid non-ASCII UTF-8 chars appearing first:  */
+
+  /* EILSEQ; output is truncated at the first non-ASCII character.  */
+  test_iconv ("ASCII", "UTF-8", jutf8, strlen (ju2a), (size_t) -1, ju2a,
+              EILSEQ);
+
+  /* With TRANSLIT enabled: EILSEQ; output now truncated at the first invalid
+     UTF-8 character.  */
+  test_iconv ("ASCII//TRANSLIT", "UTF-8", jutf8, strlen (jutf8) - 5,
+              (size_t) -1, ju2a_translit, EILSEQ);
+
+  /* With IGNORE enabled: EILSEQ; output omits invalid UTF-8 characters and
+     valid UTF-8 non-ASCII characters.  */
+  test_iconv ("ASCII//IGNORE", "UTF-8", jutf8, strlen (jutf8), (size_t) -1,
+              ju2a_ignore, EILSEQ);
+
+  /* With TRANSLIT and IGNORE enabled, output omits only invalid UTF-8
+     characters and transliterates valid non-ASCII UTF-8 characters.  We test
+     four combinations.  */
+
+  test_iconv ("ASCII//TRANSLIT,IGNORE", "UTF-8", jutf8, strlen (jutf8), 2,
+              ju2a_both, 0);
+  /* Due to bug 19519, iconv was ignoring IGNORE for the following input.  */
+  test_iconv ("ASCII//TRANSLIT//IGNORE", "UTF-8", jutf8, strlen (jutf8), 2,
+              ju2a_both, 0);
+  test_iconv ("ASCII//IGNORE,TRANSLIT", "UTF-8", jutf8, strlen (jutf8), 2,
+              ju2a_both, 0);
+  /* Due to bug 19519, iconv was ignoring TRANSLIT for the following input.  */
+  test_iconv ("ASCII//IGNORE//TRANSLIT", "UTF-8", jutf8, strlen (jutf8), 2,
+              ju2a_both, 0);
+  /* Trailing whitespace and separators should be ignored.  */
+  test_iconv ("ASCII//IGNORE,TRANSLIT ", "UTF-8", jutf8, strlen (jutf8), 2,
+              ju2a_both, 0);
+  test_iconv ("ASCII//IGNORE,TRANSLIT/", "UTF-8", jutf8, strlen (jutf8), 2,
+              ju2a_both, 0);
+  test_iconv ("ASCII//IGNORE,TRANSLIT//", "UTF-8", jutf8, strlen (jutf8), 2,
+              ju2a_both, 0);
+  test_iconv ("ASCII//IGNORE,TRANSLIT,", "UTF-8", jutf8, strlen (jutf8), 2,
+              ju2a_both, 0);
+  test_iconv ("ASCII//IGNORE,TRANSLIT,,", "UTF-8", jutf8, strlen (jutf8), 2,
+              ju2a_both, 0);
+  test_iconv ("ASCII//IGNORE,TRANSLIT /,", "UTF-8", jutf8, strlen (jutf8), 2,
+              ju2a_both, 0);
+
+  /* 5. Charset names of the form "A/B/":  */
+
+  /* ISO-8859-1 is converted to UTF-8 without needing transliteration.  */
+  test_iconv ("ISO-10646/UTF-8", "ISO-8859-1", iso8859_1_a,
+              strlen (iso8859_1_a), 0, utf8_a, 0);
+  test_iconv ("ISO-10646/UTF-8/", "ISO-8859-1", iso8859_1_a,
+              strlen (iso8859_1_a), 0, utf8_a, 0);
+  test_iconv ("ISO-10646/UTF-8/IGNORE", "ISO-8859-1", iso8859_1_a,
+              strlen (iso8859_1_a), 0, utf8_a, 0);
+  test_iconv ("ISO-10646/UTF-8//IGNORE", "ISO-8859-1", iso8859_1_a,
+              strlen (iso8859_1_a), 0, utf8_a, 0);
+  test_iconv ("ISO-10646/UTF-8/TRANSLIT", "ISO-8859-1", iso8859_1_a,
+              strlen (iso8859_1_a), 0, utf8_a, 0);
+  test_iconv ("ISO-10646/UTF-8//TRANSLIT", "ISO-8859-1", iso8859_1_a,
+              strlen (iso8859_1_a), 0, utf8_a, 0);
+  test_iconv ("ISO-10646/UTF-8//TRANSLIT/IGNORE", "ISO-8859-1", iso8859_1_a,
+              strlen (iso8859_1_a), 0, utf8_a, 0);
+  test_iconv ("ISO-10646/UTF-8//TRANSLIT//IGNORE", "ISO-8859-1", iso8859_1_a,
+              strlen (iso8859_1_a), 0, utf8_a, 0);
+  test_iconv ("ISO-10646/UTF-8/TRANSLIT,IGNORE", "ISO-8859-1", iso8859_1_a,
+              strlen (iso8859_1_a), 0, utf8_a, 0);
+
+  /* UTF-8 with accented A's is converted to ASCII with transliteration.  */
+  test_iconv ("ASCII", "ISO-10646/UTF-8", utf8_a,
+              0, (size_t) -1, empty, EILSEQ);
+  test_iconv ("ASCII//IGNORE", "ISO-10646/UTF-8", utf8_a,
+              strlen (utf8_a), (size_t) -1, empty, EILSEQ);
+  test_iconv ("ASCII//TRANSLIT", "ISO-10646/UTF-8", utf8_a,
+              strlen (utf8_a), 12, ascii_a, 0);
+
+  /* Invalid ASCII is converted to UTF-8 only with IGNORE.  */
+  test_iconv ("ISO-10646/UTF-8", "ASCII", iascii, strlen (empty), (size_t) -1,
+              empty, EILSEQ);
+  test_iconv ("ISO-10646/UTF-8/TRANSLIT", "ASCII", iascii, strlen (empty),
+              (size_t) -1, empty, EILSEQ);
+  test_iconv ("ISO-10646/UTF-8/IGNORE", "ASCII", iascii, strlen (iascii),
+              (size_t) -1, ia2u_ignore, EILSEQ);
+  test_iconv ("ISO-10646/UTF-8/TRANSLIT,IGNORE", "ASCII", iascii,
+              strlen (iascii), (size_t) -1, ia2u_ignore, EILSEQ);
+  /* Due to bug 19519, iconv was ignoring IGNORE for the following three
+     inputs: */
+  test_iconv ("ISO-10646/UTF-8/TRANSLIT/IGNORE", "ASCII", iascii,
+              strlen (iascii), (size_t) -1, ia2u_ignore, EILSEQ);
+  test_iconv ("ISO-10646/UTF-8//TRANSLIT,IGNORE", "ASCII", iascii,
+              strlen (iascii), (size_t) -1, ia2u_ignore, EILSEQ);
+  test_iconv ("ISO-10646/UTF-8//TRANSLIT//IGNORE", "ASCII", iascii,
+              strlen (iascii), (size_t) -1, ia2u_ignore, EILSEQ);
+
+  return 0;
+}
+
+#include <support/test-driver.c>
diff --git a/iconv/tst-iconv_prog.sh b/iconv/tst-iconv_prog.sh
new file mode 100644
index 0000000000..25a8ce3256
--- /dev/null
+++ b/iconv/tst-iconv_prog.sh
@@ -0,0 +1,278 @@ 
+#!/bin/bash
+# Test for some known iconv(1) hangs from bug 19519, and miscellaneous
+# iconv(1) program error conditions.
+# Copyright (C) 2019 Free Software Foundation, Inc.
+# This file is part of the GNU C Library.
+
+# The GNU C Library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+
+# The GNU C Library 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
+# Lesser General Public License for more details.
+
+# You should have received a copy of the GNU Lesser General Public
+# License along with the GNU C Library; if not, see
+# <https://www.gnu.org/licenses/>.
+
+codir=$1
+test_wrapper_env="$2"
+run_program_env="$3"
+
+# We have to have some directories in the library path.
+LIBPATH=$codir:$codir/iconvdata
+
+# How the start the iconv(1) program.
+ICONV='$codir/elf/ld.so --library-path $LIBPATH --inhibit-rpath ${from}.so \
+       $codir/iconv/iconv_prog'
+ICONV="$test_wrapper_env $run_program_env $ICONV"
+
+# List of known hangs;
+# Gathered by running an exhaustive 2 byte input search against glibc-2.28
+hangarray=(
+"\x00\x23;-c;ANSI_X3.110;UTF-8//TRANSLIT//IGNORE"
+"\x00\xa1;-c;ARMSCII-8;UTF-8//TRANSLIT//IGNORE"
+"\x00\xa1;-c;ASMO_449;UTF-8//TRANSLIT//IGNORE"
+"\x00\x81;-c;BIG5;UTF-8//TRANSLIT//IGNORE"
+"\x00\xff;-c;BIG5HKSCS;UTF-8//TRANSLIT//IGNORE"
+"\x00\xff;-c;BRF;UTF-8//TRANSLIT//IGNORE"
+"\x00\xff;-c;BS_4730;UTF-8//TRANSLIT//IGNORE"
+"\x00\x81;-c;CP1250;UTF-8//TRANSLIT//IGNORE"
+"\x00\x98;-c;CP1251;UTF-8//TRANSLIT//IGNORE"
+"\x00\x81;-c;CP1252;UTF-8//TRANSLIT//IGNORE"
+"\x00\x81;-c;CP1253;UTF-8//TRANSLIT//IGNORE"
+"\x00\x81;-c;CP1254;UTF-8//TRANSLIT//IGNORE"
+"\x00\x81;-c;CP1255;UTF-8//TRANSLIT//IGNORE"
+"\x00\x81;-c;CP1257;UTF-8//TRANSLIT//IGNORE"
+"\x00\x81;-c;CP1258;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;CP932;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;CSA_Z243.4-1985-1;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;CSA_Z243.4-1985-2;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;DEC-MCS;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;DIN_66003;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;DS_2089;UTF-8//TRANSLIT//IGNORE"
+"\x00\x41;-c;EBCDIC-AT-DE;UTF-8//TRANSLIT//IGNORE"
+"\x00\x41;-c;EBCDIC-AT-DE-A;UTF-8//TRANSLIT//IGNORE"
+"\x00\x41;-c;EBCDIC-CA-FR;UTF-8//TRANSLIT//IGNORE"
+"\x00\x41;-c;EBCDIC-DK-NO;UTF-8//TRANSLIT//IGNORE"
+"\x00\x41;-c;EBCDIC-DK-NO-A;UTF-8//TRANSLIT//IGNORE"
+"\x00\x41;-c;EBCDIC-ES;UTF-8//TRANSLIT//IGNORE"
+"\x00\x41;-c;EBCDIC-ES-A;UTF-8//TRANSLIT//IGNORE"
+"\x00\x41;-c;EBCDIC-ES-S;UTF-8//TRANSLIT//IGNORE"
+"\x00\x41;-c;EBCDIC-FI-SE;UTF-8//TRANSLIT//IGNORE"
+"\x00\x41;-c;EBCDIC-FI-SE-A;UTF-8//TRANSLIT//IGNORE"
+"\x00\x41;-c;EBCDIC-FR;UTF-8//TRANSLIT//IGNORE"
+"\x00\x41;-c;EBCDIC-IS-FRISS;UTF-8//TRANSLIT//IGNORE"
+"\x00\x41;-c;EBCDIC-IT;UTF-8//TRANSLIT//IGNORE"
+"\x00\x41;-c;EBCDIC-PT;UTF-8//TRANSLIT//IGNORE"
+"\x00\x41;-c;EBCDIC-UK;UTF-8//TRANSLIT//IGNORE"
+"\x00\x41;-c;EBCDIC-US;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;ES;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;ES2;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;EUC-CN;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;EUC-JISX0213;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;EUC-JP;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;EUC-JP-MS;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;EUC-KR;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;EUC-TW;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;GB18030;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;GB_1988-80;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;GBK;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;GOST_19768-74;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;GREEK7;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;GREEK7-OLD;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;GREEK-CCITT;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;HP-GREEK8;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;HP-ROMAN8;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;HP-ROMAN9;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;HP-THAI8;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;HP-TURKISH8;UTF-8//TRANSLIT//IGNORE"
+"\x00\x41;-c;IBM038;UTF-8//TRANSLIT//IGNORE"
+"\x00\x80;-c;IBM1004;UTF-8//TRANSLIT//IGNORE"
+"\x00\xff;-c;IBM1008;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;IBM1046;UTF-8//TRANSLIT//IGNORE"
+"\x00\x51;-c;IBM1132;UTF-8//TRANSLIT//IGNORE"
+"\x00\xa0;-c;IBM1133;UTF-8//TRANSLIT//IGNORE"
+"\x00\xce;-c;IBM1137;UTF-8//TRANSLIT//IGNORE"
+"\x00\x80;-c;IBM1161;UTF-8//TRANSLIT//IGNORE"
+"\x00\xdb;-c;IBM1162;UTF-8//TRANSLIT//IGNORE"
+"\x00\x70;-c;IBM12712;UTF-8//TRANSLIT//IGNORE"
+# These are known hangs that are yet to be fixed:
+# "\x00\x0f;-c;IBM1364;UTF-8"
+# "\x00\x0f;-c;IBM1371;UTF-8"
+# "\x00\x0f;-c;IBM1388;UTF-8"
+# "\x00\x0f;-c;IBM1390;UTF-8"
+# "\x00\x0f;-c;IBM1399;UTF-8"
+"\x00\x53;-c;IBM16804;UTF-8//TRANSLIT//IGNORE"
+"\x00\x41;-c;IBM274;UTF-8//TRANSLIT//IGNORE"
+"\x00\x41;-c;IBM275;UTF-8//TRANSLIT//IGNORE"
+"\x00\x41;-c;IBM281;UTF-8//TRANSLIT//IGNORE"
+"\x00\x57;-c;IBM290;UTF-8//TRANSLIT//IGNORE"
+"\x00\x45;-c;IBM420;UTF-8//TRANSLIT//IGNORE"
+"\x00\x68;-c;IBM423;UTF-8//TRANSLIT//IGNORE"
+"\x00\x70;-c;IBM424;UTF-8//TRANSLIT//IGNORE"
+"\x00\x53;-c;IBM4517;UTF-8//TRANSLIT//IGNORE"
+"\x00\x53;-c;IBM4899;UTF-8//TRANSLIT//IGNORE"
+"\x00\xa5;-c;IBM4909;UTF-8//TRANSLIT//IGNORE"
+"\x00\xdc;-c;IBM4971;UTF-8//TRANSLIT//IGNORE"
+"\x00\x41;-c;IBM803;UTF-8//TRANSLIT//IGNORE"
+"\x00\x91;-c;IBM851;UTF-8//TRANSLIT//IGNORE"
+"\x00\x9b;-c;IBM856;UTF-8//TRANSLIT//IGNORE"
+"\x00\xd5;-c;IBM857;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;IBM864;UTF-8//TRANSLIT//IGNORE"
+"\x00\x94;-c;IBM868;UTF-8//TRANSLIT//IGNORE"
+"\x00\x94;-c;IBM869;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;IBM874;UTF-8//TRANSLIT//IGNORE"
+"\x00\x6a;-c;IBM875;UTF-8//TRANSLIT//IGNORE"
+"\x00\x41;-c;IBM880;UTF-8//TRANSLIT//IGNORE"
+"\x00\x80;-c;IBM891;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;IBM903;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;IBM904;UTF-8//TRANSLIT//IGNORE"
+"\x00\x41;-c;IBM905;UTF-8//TRANSLIT//IGNORE"
+"\x00\x80;-c;IBM9066;UTF-8//TRANSLIT//IGNORE"
+"\x00\x48;-c;IBM918;UTF-8//TRANSLIT//IGNORE"
+"\x00\x57;-c;IBM930;UTF-8//TRANSLIT//IGNORE"
+"\x00\x80;-c;IBM932;UTF-8//TRANSLIT//IGNORE"
+"\x00\x41;-c;IBM933;UTF-8//TRANSLIT//IGNORE"
+"\x00\x41;-c;IBM935;UTF-8//TRANSLIT//IGNORE"
+"\x00\x41;-c;IBM937;UTF-8//TRANSLIT//IGNORE"
+"\x00\x41;-c;IBM939;UTF-8//TRANSLIT//IGNORE"
+"\x00\x80;-c;IBM943;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;INIS;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;INIS-8;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;INIS-CYRILLIC;UTF-8//TRANSLIT//IGNORE"
+"\x00\xec;-c;ISIRI-3342;UTF-8//TRANSLIT//IGNORE"
+"\x00\xec;-c;ISO_10367-BOX;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;ISO-2022-CN;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;ISO-2022-CN-EXT;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;ISO-2022-JP;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;ISO-2022-JP-2;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;ISO-2022-JP-3;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;ISO-2022-KR;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;ISO_2033;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;ISO_5427;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;ISO_5427-EXT;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;ISO_5428;UTF-8//TRANSLIT//IGNORE"
+"\x00\xa4;-c;ISO_6937;UTF-8//TRANSLIT//IGNORE"
+"\x00\xa0;-c;ISO_6937-2;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;ISO-8859-11;UTF-8//TRANSLIT//IGNORE"
+"\x00\xa5;-c;ISO-8859-3;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;ISO-8859-6;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;ISO-8859-7;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;ISO-8859-8;UTF-8//TRANSLIT//IGNORE"
+"\x00\x80;-c;ISO-IR-197;UTF-8//TRANSLIT//IGNORE"
+"\x00\x80;-c;ISO-IR-209;UTF-8//TRANSLIT//IGNORE"
+"\x00\x80;-c;IT;UTF-8//TRANSLIT//IGNORE"
+"\x00\x80;-c;JIS_C6220-1969-RO;UTF-8//TRANSLIT//IGNORE"
+"\x00\x80;-c;JIS_C6229-1984-B;UTF-8//TRANSLIT//IGNORE"
+"\x00\x80;-c;JOHAB;UTF-8//TRANSLIT//IGNORE"
+"\x00\x80;-c;JUS_I.B1.002;UTF-8//TRANSLIT//IGNORE"
+"\x00\x80;-c;KOI-8;UTF-8//TRANSLIT//IGNORE"
+"\x00\x88;-c;KOI8-T;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;KSC5636;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;LATIN-GREEK;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;LATIN-GREEK-1;UTF-8//TRANSLIT//IGNORE"
+"\x00\xf6;-c;MAC-IS;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;MSZ_7795.3;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;NATS-DANO;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;NATS-SEFI;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;NC_NC00-10;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;NF_Z_62-010;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;NF_Z_62-010_1973;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;NS_4551-1;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;NS_4551-2;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;PT;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;PT2;UTF-8//TRANSLIT//IGNORE"
+"\x00\x98;-c;RK1048;UTF-8//TRANSLIT//IGNORE"
+"\x00\x98;-c;SEN_850200_B;UTF-8//TRANSLIT//IGNORE"
+"\x00\x98;-c;SEN_850200_C;UTF-8//TRANSLIT//IGNORE"
+"\x00\x80;-c;Shift_JISX0213;UTF-8//TRANSLIT//IGNORE"
+"\x00\x80;-c;SJIS;UTF-8//TRANSLIT//IGNORE"
+"\x00\x23;-c;T.61-8BIT;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;TIS-620;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;TSCII;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;UHC;UTF-8//TRANSLIT//IGNORE"
+"\x00\xd8;-c;UNICODE;UTF-8//TRANSLIT//IGNORE"
+"\x00\xdc;-c;UTF-16;UTF-8//TRANSLIT//IGNORE"
+"\xdc\x00;-c;UTF-16BE;UTF-8//TRANSLIT//IGNORE"
+"\x00\xdc;-c;UTF-16LE;UTF-8//TRANSLIT//IGNORE"
+"\xff\xff;-c;UTF-7;UTF-8//TRANSLIT//IGNORE"
+"\x00\x81;-c;WIN-SAMI-2;UTF-8//TRANSLIT//IGNORE"
+)
+
+# List of option combinations that *should* lead to an error
+errorarray=(
+# Converting from/to invalid character sets should cause error
+"\x00\x00;;INVALID;INVALID"
+"\x00\x00;;INVALID;UTF-8"
+"\x00\x00;;UTF-8;INVALID"
+)
+
+# Requires $twobyte input, $c flag, $from, and $to to be set; sets $ret
+execute_test ()
+{
+  PROG=`eval echo $ICONV`
+  echo -en "$twobyte" |
+  timeout -k 4 3 $PROG $c -f $from -t "$to" &>/dev/null
+  ret=$?
+}
+
+log_hangtest_result ()
+{
+  if [ "$ret" -eq "124" ] || [ "$ret" -eq "137" ]; then # timeout/hang
+    result="HANG"
+  else
+    if [ "$ret" -eq "139" ]; then # segfault
+      result="SEGFAULT"
+    else
+      if [ "$ret" -gt "127" ]; then # unexpected error
+        result="UNEXPECTED"
+      else
+        result="OK"
+      fi
+    fi
+  fi
+
+  echo -n "$result: from: \"$from\", to: \"$to\","
+  echo    " input \"$twobyte\", flags \"$c\""
+
+  if [ "$result" != "OK" ]; then
+    exit 1
+  fi
+}
+
+for hangcommand in "${hangarray[@]}"; do
+  twobyte="$(echo "$hangcommand" | cut -d";" -f 1)"
+  c="$(echo "$hangcommand" | cut -d";" -f 2)"
+  from="$(echo "$hangcommand" | cut -d";" -f 3)"
+  to="$(echo "$hangcommand" | cut -d";" -f 4)"
+  execute_test
+  log_hangtest_result
+done
+
+log_errtest_result ()
+{
+  if [ "$ret" -eq "1" ]; then # we errored out as expected
+    result="PASS"
+  else
+    result="FAIL"
+  fi
+  echo -n "$result: from: \"$from\", to: \"$to\","
+  echo    " input \"$twobyte\", flags \"$c\", return code $ret"
+
+  if [ "$result" != "PASS" ]; then
+    exit 1
+  fi
+}
+
+for errorcommand in "${errorarray[@]}"; do
+  twobyte="$(echo "$errorcommand" | cut -d";" -f 1)"
+  c="$(echo "$errorcommand" | cut -d";" -f 2)"
+  from="$(echo "$errorcommand" | cut -d";" -f 3)"
+  to="$(echo "$errorcommand" | cut -d";" -f 4)"
+  execute_test
+  log_errtest_result
+done
diff --git a/intl/dcigettext.c b/intl/dcigettext.c
index 09e3dca256..5560d1e700 100644
--- a/intl/dcigettext.c
+++ b/intl/dcigettext.c
@@ -1119,11 +1119,16 @@  _nl_find_msg (struct loaded_l10nfile *domain_file,
 		      outcharset = encoding;
 
 # ifdef _LIBC
-		      /* We always want to use transliteration.  */
-		      outcharset = norm_add_slashes (outcharset, "TRANSLIT");
-		      charset = norm_add_slashes (charset, "");
-		      int r = __gconv_open (outcharset, charset, &convd->conv,
-					    GCONV_AVOID_NOCONV);
+
+		      struct gconv_spec conv_spec
+		        = { .fromcode = norm_add_slashes (charset, ""),
+		            .tocode = norm_add_slashes (outcharset, ""),
+		            /* We always want to use transliteration.  */
+		            .translit = 1,
+		            .ignore = 0
+		          };
+		      int r = __gconv_open (&conv_spec, &convd->conv,
+		                            GCONV_AVOID_NOCONV);
 		      if (__builtin_expect (r != __GCONV_OK, 0))
 			{
 			  /* If the output encoding is the same there is