Simplify calling convention of u*_conv_to_encoding.
authorBruno Haible <bruno@clisp.org>
Sun, 26 Apr 2009 13:31:18 +0000 (15:31 +0200)
committerBruno Haible <bruno@clisp.org>
Sun, 26 Apr 2009 13:31:18 +0000 (15:31 +0200)
ChangeLog
NEWS
lib/unicase/u-casexfrm.h
lib/uniconv.h
lib/uniconv/u-conv-to-enc.h
lib/uniconv/u8-conv-to-enc.c
lib/uninorm/u-normxfrm.h
lib/vasnprintf.c
tests/uniconv/test-u16-conv-to-enc.c
tests/uniconv/test-u32-conv-to-enc.c
tests/uniconv/test-u8-conv-to-enc.c

index 5d76bf7..d1a4044 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,22 @@
 2009-04-26  Bruno Haible  <bruno@clisp.org>
 
+       Simplify calling convention of u*_conv_to_encoding.
+       * lib/uniconv.h (u8_conv_to_encoding, u16_conv_to_encoding,
+       u32_conv_to_encoding): Expect a resultbuf argument and return the
+       result directly as a pointer.
+       * lib/uniconv/u8-conv-to-enc.c (u8_conv_to_encoding): Likewise.
+       * lib/uniconv/u-conv-to-enc.h (FUNC): Likewise. Preserve errno while
+       freeing scaled_offsets if mem_iconveha failed.
+       * lib/unicase/u-casexfrm.h (FUNC): Update.
+       * lib/uninorm/u-normxfrm.h (FUNC): Update.
+       * lib/vasnprintf.c (VASNPRINTF): Update.
+       * tests/uniconv/test-u8-conv-to-enc.c (main): Update.
+       * tests/uniconv/test-u16-conv-to-enc.c (main): Update.
+       * tests/uniconv/test-u32-conv-to-enc.c (main): Update.
+       * NEWS: Mention the change.
+
+2009-04-26  Bruno Haible  <bruno@clisp.org>
+
        Avoid test failures on AIX and OSF/1.
        * lib/uniconv/u8-conv-from-enc.c (u8_conv_from_encoding): Avoid calling
        malloc(0).
diff --git a/NEWS b/NEWS
index 0285076..9e51a03 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -6,7 +6,13 @@ User visible incompatible changes
 
 Date        Modules         Changes
 
-2009-04-24 maintainer-makefile
+2009-04-26  modules/uniconv/u8-conv-to-enc
+            modules/uniconv/u16-conv-to-enc
+            modules/uniconv/u32-conv-to-enc
+                            The calling convention of the functions
+                            u*_conv_to_encoding is changed.
+
+2009-04-24  maintainer-makefile
                             The maint.mk file was copied from
                             coreutils, and the old
                             coverage/gettext/indent rules were
index a7298a9..e36aff3 100644 (file)
@@ -26,7 +26,6 @@ FUNC (const UNIT *s, size_t n, const char *iso639_language, uninorm_t nf,
   char convsbuf[2048];
   char *convs;
   size_t convs_length;
-  int ret;
   char *result;
 
   /* Casefold and normalize the Unicode string.  */
@@ -37,14 +36,13 @@ FUNC (const UNIT *s, size_t n, const char *iso639_language, uninorm_t nf,
     return NULL;
 
   /* Convert it to locale encoding.  */
-  convs = convsbuf;
   convs_length = sizeof (convsbuf) - 1;
-  ret = U_CONV_TO_ENCODING (locale_charset (),
-                           iconveh_error,
-                           foldeds, foldeds_length,
-                           NULL,
-                           &convs, &convs_length);
-  if (ret < 0)
+  convs = U_CONV_TO_ENCODING (locale_charset (),
+                             iconveh_error,
+                             foldeds, foldeds_length,
+                             NULL,
+                             convsbuf, &convs_length);
+  if (convs == NULL)
     {
       if (foldeds != foldedsbuf)
        {
index 4c565ad..d364202 100644 (file)
@@ -84,32 +84,32 @@ extern int
    array is filled with offsets into the result, i.e. the character starting
    at SRC[i] corresponds to the character starting at (*RESULTP)[OFFSETS[i]],
    and other offsets are set to (size_t)(-1).
-   *RESULTP and *LENGTHP should initially be a scratch buffer and its size,
-   or *RESULTP can initially be NULL.
+   RESULTBUF and *LENGTHP should initially be a scratch buffer and its size,
+   or RESULTBUF can be NULL.
    May erase the contents of the memory at *RESULTP.
-   Return value: 0 if successful, otherwise -1 and errno set.
-   If successful: The resulting string is stored in *RESULTP and its length
-   in *LENGTHP.  *RESULTP is set to a freshly allocated memory block, or is
-   unchanged if no dynamic memory allocation was necessary.
-   Particular errno values: EINVAL, EILSEQ, ENOMEM.  */
-extern int
+   If successful: The resulting string (non-NULL) is returned and its length
+   stored in *LENGTHP.  The resulting string is RESULTBUF if no dynamic memory
+   allocation was necessary, or a freshly allocated memory block otherwise.
+   In case of error: NULL is returned and errno is set.  Particular errno
+   values: EINVAL, EILSEQ, ENOMEM.  */
+extern char *
        u8_conv_to_encoding (const char *tocode,
                            enum iconv_ilseq_handler handler,
                            const uint8_t *src, size_t srclen,
                            size_t *offsets,
-                           char **resultp, size_t *lengthp);
-extern int
+                           char *resultbuf, size_t *lengthp);
+extern char *
        u16_conv_to_encoding (const char *tocode,
                             enum iconv_ilseq_handler handler,
                             const uint16_t *src, size_t srclen,
                             size_t *offsets,
-                            char **resultp, size_t *lengthp);
-extern int
+                            char *resultbuf, size_t *lengthp);
+extern char *
        u32_conv_to_encoding (const char *tocode,
                             enum iconv_ilseq_handler handler,
                             const uint32_t *src, size_t srclen,
                             size_t *offsets,
-                            char **resultp, size_t *lengthp);
+                            char *resultbuf, size_t *lengthp);
 
 /* Converts a NUL terminated string from a given encoding.
    The result is malloc allocated, or NULL (with errno set) in case of error.
index 144ea40..f8840c2 100644 (file)
    You should have received a copy of the GNU Lesser General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
-int
+char *
 FUNC (const char *tocode,
       enum iconv_ilseq_handler handler,
       const UNIT *src, size_t srclen,
       size_t *offsets,
-      char **resultp, size_t *lengthp)
+      char *resultbuf, size_t *lengthp)
 {
 #if HAVE_UTF_NAME
   size_t *scaled_offsets;
+  char *result;
+  size_t length;
   int retval;
 
   if (offsets != NULL && srclen > 0)
@@ -32,42 +34,59 @@ FUNC (const char *tocode,
       if (scaled_offsets == NULL)
        {
          errno = ENOMEM;
-         return -1;
+         return NULL;
        }
     }
   else
     scaled_offsets = NULL;
 
+  result = resultbuf;
+  length = *lengthp;
   retval = mem_iconveha ((const char *) src, srclen * sizeof (UNIT),
                         UTF_NAME, tocode,
                         handler == iconveh_question_mark, handler,
-                        scaled_offsets, resultp, lengthp);
+                        scaled_offsets, &result, &length);
+  if (retval < 0)
+    {
+      int saved_errno = errno;
+      free (scaled_offsets);
+      errno = saved_errno;
+      return NULL;
+    }
 
   if (offsets != NULL)
     {
-      if (retval >= 0)
-       {
-         /* Convert scaled_offsets[srclen * sizeof (UNIT)] to
-            offsets[srclen].  */
-         size_t i;
+      /* Convert scaled_offsets[srclen * sizeof (UNIT)] to
+        offsets[srclen].  */
+      size_t i;
 
-         for (i = 0; i < srclen; i++)
-           offsets[i] = scaled_offsets[i * sizeof (UNIT)];
-       }
+      for (i = 0; i < srclen; i++)
+       offsets[i] = scaled_offsets[i * sizeof (UNIT)];
       free (scaled_offsets);
     }
-  return retval;
+
+  if (result == NULL) /* when (resultbuf == NULL && length == 0)  */
+    {
+      result = (char *) malloc (1);
+      if (result == NULL)
+       {
+         errno = ENOMEM;
+         return NULL;
+       }
+    }
+  *lengthp = length;
+  return result;
 #else
   uint8_t tmpbuf[4096];
   size_t tmpbufsize = SIZEOF (tmpbuf);
   uint8_t *utf8_src;
   size_t utf8_srclen;
   size_t *scaled_offsets;
-  int retval;
+  char *result;
 
   utf8_src = U_TO_U8 (src, srclen, tmpbuf, &tmpbufsize);
   if (utf8_src == NULL)
-    return -1;
+    return NULL;
   utf8_srclen = tmpbufsize;
 
   if (offsets != NULL && utf8_srclen > 0)
@@ -78,22 +97,22 @@ FUNC (const char *tocode,
          if (utf8_src != tmpbuf)
            free (utf8_src);
          errno = ENOMEM;
-         return -1;
+         return NULL;
        }
     }
   else
     scaled_offsets = NULL;
 
-  retval = u8_conv_to_encoding (tocode, handler, utf8_src, utf8_srclen,
-                               scaled_offsets, resultp, lengthp);
-  if (retval < 0)
+  result = u8_conv_to_encoding (tocode, handler, utf8_src, utf8_srclen,
+                               scaled_offsets, resultbuf, lengthp);
+  if (result == NULL)
     {
       int saved_errno = errno;
       free (scaled_offsets);
       if (utf8_src != tmpbuf)
        free (utf8_src);
       errno = saved_errno;
-      return -1;
+      return NULL;
     }
   if (offsets != NULL)
     {
@@ -134,6 +153,6 @@ FUNC (const char *tocode,
     }
   if (utf8_src != tmpbuf)
     free (utf8_src);
-  return retval;
+  return result;
 #endif
 }
index 85404d4..5aec163 100644 (file)
 #include "striconveha.h"
 #include "unistr.h"
 
-int
+char *
 u8_conv_to_encoding (const char *tocode,
                     enum iconv_ilseq_handler handler,
                     const uint8_t *src, size_t srclen,
                     size_t *offsets,
-                    char **resultp, size_t *lengthp)
+                    char *resultbuf, size_t *lengthp)
 {
-  char *result;
-
   if (STRCASEEQ (tocode, "UTF-8", 'U','T','F','-','8',0,0,0,0))
     {
+      char *result;
+
       /* Conversion from UTF-8 to UTF-8.  No need to go through iconv().  */
 #if CONFIG_UNICODE_SAFETY
       if (u8_check (src, srclen))
        {
          errno = EILSEQ;
-         return -1;
+         return NULL;
        }
 #endif
 
       /* Memory allocation.  */
-      if ((*resultp != NULL && *lengthp >= srclen) || srclen == 0)
-       result = *resultp;
+      if (resultbuf != NULL && *lengthp >= srclen)
+       result = resultbuf;
       else
        {
-         result = (char *) malloc (srclen);
+         result = (char *) malloc (srclen > 0 ? srclen : 1);
          if (result == NULL)
            {
              errno = ENOMEM;
-             return -1;
+             return NULL;
            }
        }
 
       memcpy (result, (const char *) src, srclen);
-      *resultp = result;
       *lengthp = srclen;
-      return 0;
+      return result;
     }
   else
-    return mem_iconveha ((const char *) src, srclen,
-                        "UTF-8", tocode,
-                        handler == iconveh_question_mark, handler,
-                        offsets, resultp, lengthp);
+    {
+      char *result = resultbuf;
+      size_t length = *lengthp;
+      int retval =
+       mem_iconveha ((const char *) src, srclen,
+                     "UTF-8", tocode,
+                     handler == iconveh_question_mark, handler,
+                     offsets, &result, &length);
+
+      if (retval < 0)
+       return NULL;
+
+      if (result == NULL) /* when (resultbuf == NULL && length == 0)  */
+       {
+         result = (char *) malloc (1);
+         if (result == NULL)
+           {
+             errno = ENOMEM;
+             return NULL;
+           }
+       }
+      *lengthp = length;
+      return result;
+    }
 }
index 60036b1..6ed1e3c 100644 (file)
@@ -25,7 +25,6 @@ FUNC (const UNIT *s, size_t n, uninorm_t nf,
   char convsbuf[2048];
   char *convs;
   size_t convs_length;
-  int ret;
   char *result;
 
   /* Normalize the Unicode string.  */
@@ -36,14 +35,13 @@ FUNC (const UNIT *s, size_t n, uninorm_t nf,
     return NULL;
 
   /* Convert it to locale encoding.  */
-  convs = convsbuf;
   convs_length = sizeof (convsbuf) - 1;
-  ret = U_CONV_TO_ENCODING (locale_charset (),
-                           iconveh_error,
-                           norms, norms_length,
-                           NULL,
-                           &convs, &convs_length);
-  if (ret < 0)
+  convs = U_CONV_TO_ENCODING (locale_charset (),
+                             iconveh_error,
+                             norms, norms_length,
+                             NULL,
+                             convsbuf, &convs_length);
+  if (convs == NULL)
     {
       if (norms != normsbuf)
        {
index ce4e44b..51375eb 100644 (file)
@@ -1799,18 +1799,18 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
                        size_t converted_len = allocated - length;
 #  if DCHAR_IS_TCHAR
                        /* Convert from UTF-8 to locale encoding.  */
-                       if (u8_conv_to_encoding (locale_charset (),
-                                                iconveh_question_mark,
-                                                arg, arg_end - arg, NULL,
-                                                &converted, &converted_len)
-                           < 0)
+                       converted =
+                         u8_conv_to_encoding (locale_charset (),
+                                              iconveh_question_mark,
+                                              arg, arg_end - arg, NULL,
+                                              converted, &converted_len);
 #  else
                        /* Convert from UTF-8 to UTF-16/UTF-32.  */
                        converted =
                          U8_TO_DCHAR (arg, arg_end - arg,
                                       converted, &converted_len);
-                       if (converted == NULL)
 #  endif
+                       if (converted == NULL)
                          {
                            int saved_errno = errno;
                            if (!(result == resultbuf || result == NULL))
@@ -1927,18 +1927,18 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
                        size_t converted_len = allocated - length;
 #  if DCHAR_IS_TCHAR
                        /* Convert from UTF-16 to locale encoding.  */
-                       if (u16_conv_to_encoding (locale_charset (),
-                                                 iconveh_question_mark,
-                                                 arg, arg_end - arg, NULL,
-                                                 &converted, &converted_len)
-                           < 0)
+                       converted =
+                         u16_conv_to_encoding (locale_charset (),
+                                               iconveh_question_mark,
+                                               arg, arg_end - arg, NULL,
+                                               converted, &converted_len);
 #  else
                        /* Convert from UTF-16 to UTF-8/UTF-32.  */
                        converted =
                          U16_TO_DCHAR (arg, arg_end - arg,
                                        converted, &converted_len);
-                       if (converted == NULL)
 #  endif
+                       if (converted == NULL)
                          {
                            int saved_errno = errno;
                            if (!(result == resultbuf || result == NULL))
@@ -2055,18 +2055,18 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
                        size_t converted_len = allocated - length;
 #  if DCHAR_IS_TCHAR
                        /* Convert from UTF-32 to locale encoding.  */
-                       if (u32_conv_to_encoding (locale_charset (),
-                                                 iconveh_question_mark,
-                                                 arg, arg_end - arg, NULL,
-                                                 &converted, &converted_len)
-                           < 0)
+                       converted =
+                         u32_conv_to_encoding (locale_charset (),
+                                               iconveh_question_mark,
+                                               arg, arg_end - arg, NULL,
+                                               converted, &converted_len);
 #  else
                        /* Convert from UTF-32 to UTF-8/UTF-16.  */
                        converted =
                          U32_TO_DCHAR (arg, arg_end - arg,
                                        converted, &converted_len);
-                       if (converted == NULL)
 #  endif
+                       if (converted == NULL)
                          {
                            int saved_errno = errno;
                            if (!(result == resultbuf || result == NULL))
index 26be776..a2dc3c6 100644 (file)
@@ -1,5 +1,5 @@
 /* Test of conversion from UTF-16 to legacy encodings.
-   Copyright (C) 2007-2008 Free Software Foundation, Inc.
+   Copyright (C) 2007-2009 Free Software Foundation, Inc.
 
    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
@@ -76,15 +76,13 @@ main ()
       for (o = 0; o < 2; o++)
        {
          size_t *offsets = (o ? new_offsets (SIZEOF (input)) : NULL);
-         char *result = NULL;
-         size_t length = 0;
-         int retval = u16_conv_to_encoding ("ISO-8859-1", handler,
-                                            input, SIZEOF (input),
-                                            offsets,
-                                            &result, &length);
-         ASSERT (retval == 0);
-         ASSERT (length == strlen (expected));
+         size_t length;
+         char *result = u16_conv_to_encoding ("ISO-8859-1", handler,
+                                              input, SIZEOF (input),
+                                              offsets,
+                                              NULL, &length);
          ASSERT (result != NULL);
+         ASSERT (length == strlen (expected));
          ASSERT (memcmp (result, expected, length) == 0);
          if (o)
            {
@@ -109,26 +107,24 @@ main ()
       for (o = 0; o < 2; o++)
        {
          size_t *offsets = (o ? new_offsets (SIZEOF (input)) : NULL);
-         char *result = NULL;
-         size_t length = 0;
-         int retval = u16_conv_to_encoding ("ISO-8859-1", handler,
-                                            input, SIZEOF (input),
-                                            offsets,
-                                            &result, &length);
+         size_t length = 0xdead;
+         char *result = u16_conv_to_encoding ("ISO-8859-1", handler,
+                                              input, SIZEOF (input),
+                                              offsets,
+                                              NULL, &length);
          switch (handler)
            {
            case iconveh_error:
-             ASSERT (retval == -1 && errno == EILSEQ);
              ASSERT (result == NULL);
-             ASSERT (length == 0);
+             ASSERT (errno == EILSEQ);
+             ASSERT (length == 0xdead);
              break;
            case iconveh_question_mark:
              {
                static const char expected[] = "Rafa? Maszkowski";
                static const char expected_translit[] = "Rafal Maszkowski";
-               ASSERT (retval == 0);
-               ASSERT (length == strlen (expected));
                ASSERT (result != NULL);
+               ASSERT (length == strlen (expected));
                ASSERT (memcmp (result, expected, length) == 0
                        || memcmp (result, expected_translit, length) == 0);
                if (o)
@@ -144,9 +140,8 @@ main ()
            case iconveh_escape_sequence:
              {
                static const char expected[] = "Rafa\\u0142 Maszkowski";
-               ASSERT (retval == 0);
-               ASSERT (length == strlen (expected));
                ASSERT (result != NULL);
+               ASSERT (length == strlen (expected));
                ASSERT (memcmp (result, expected, length) == 0);
                if (o)
                  {
@@ -170,15 +165,13 @@ main ()
       for (o = 0; o < 2; o++)
        {
          size_t *offsets = (o ? new_offsets (SIZEOF (input)) : NULL);
-         char *result = NULL;
-         size_t length = 0;
-         int retval = u16_conv_to_encoding ("ISO-8859-1", handler,
-                                            input, SIZEOF (input),
-                                            offsets,
-                                            &result, &length);
-         ASSERT (retval == 0);
+         size_t length;
+         char *result = u16_conv_to_encoding ("ISO-8859-1", handler,
+                                              input, SIZEOF (input),
+                                              offsets,
+                                              NULL, &length);
+         ASSERT (result != NULL);
          ASSERT (length == strlen (""));
-         /* result may be == NULL or != NULL.  */
          if (o)
            {
              ASSERT (offsets[0] == 0);
index f6847bc..585b737 100644 (file)
@@ -1,5 +1,5 @@
 /* Test of conversion from UTF-32 to legacy encodings.
-   Copyright (C) 2007-2008 Free Software Foundation, Inc.
+   Copyright (C) 2007-2009 Free Software Foundation, Inc.
 
    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
@@ -76,15 +76,13 @@ main ()
       for (o = 0; o < 2; o++)
        {
          size_t *offsets = (o ? new_offsets (SIZEOF (input)) : NULL);
-         char *result = NULL;
-         size_t length = 0;
-         int retval = u32_conv_to_encoding ("ISO-8859-1", handler,
-                                            input, SIZEOF (input),
-                                            offsets,
-                                            &result, &length);
-         ASSERT (retval == 0);
-         ASSERT (length == strlen (expected));
+         size_t length;
+         char *result = u32_conv_to_encoding ("ISO-8859-1", handler,
+                                              input, SIZEOF (input),
+                                              offsets,
+                                              NULL, &length);
          ASSERT (result != NULL);
+         ASSERT (length == strlen (expected));
          ASSERT (memcmp (result, expected, length) == 0);
          if (o)
            {
@@ -109,26 +107,24 @@ main ()
       for (o = 0; o < 2; o++)
        {
          size_t *offsets = (o ? new_offsets (SIZEOF (input)) : NULL);
-         char *result = NULL;
-         size_t length = 0;
-         int retval = u32_conv_to_encoding ("ISO-8859-1", handler,
-                                            input, SIZEOF (input),
-                                            offsets,
-                                            &result, &length);
+         size_t length = 0xdead;
+         char *result = u32_conv_to_encoding ("ISO-8859-1", handler,
+                                              input, SIZEOF (input),
+                                              offsets,
+                                              NULL, &length);
          switch (handler)
            {
            case iconveh_error:
-             ASSERT (retval == -1 && errno == EILSEQ);
              ASSERT (result == NULL);
-             ASSERT (length == 0);
+             ASSERT (errno == EILSEQ);
+             ASSERT (length == 0xdead);
              break;
            case iconveh_question_mark:
              {
                static const char expected[] = "Rafa? Maszkowski";
                static const char expected_translit[] = "Rafal Maszkowski";
-               ASSERT (retval == 0);
-               ASSERT (length == strlen (expected));
                ASSERT (result != NULL);
+               ASSERT (length == strlen (expected));
                ASSERT (memcmp (result, expected, length) == 0
                        || memcmp (result, expected_translit, length) == 0);
                if (o)
@@ -144,9 +140,8 @@ main ()
            case iconveh_escape_sequence:
              {
                static const char expected[] = "Rafa\\u0142 Maszkowski";
-               ASSERT (retval == 0);
-               ASSERT (length == strlen (expected));
                ASSERT (result != NULL);
+               ASSERT (length == strlen (expected));
                ASSERT (memcmp (result, expected, length) == 0);
                if (o)
                  {
index f30b1c5..271fb05 100644 (file)
@@ -1,5 +1,5 @@
 /* Test of conversion from UTF-8 to legacy encodings.
-   Copyright (C) 2007-2008 Free Software Foundation, Inc.
+   Copyright (C) 2007-2009 Free Software Foundation, Inc.
 
    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
@@ -73,15 +73,13 @@ main ()
       for (o = 0; o < 2; o++)
        {
          size_t *offsets = (o ? new_offsets (u8_strlen (input)) : NULL);
-         char *result = NULL;
-         size_t length = 0;
-         int retval = u8_conv_to_encoding ("ISO-8859-1", handler,
-                                           input, u8_strlen (input),
-                                           offsets,
-                                           &result, &length);
-         ASSERT (retval == 0);
-         ASSERT (length == strlen (expected));
+         size_t length;
+         char *result = u8_conv_to_encoding ("ISO-8859-1", handler,
+                                             input, u8_strlen (input),
+                                             offsets,
+                                             NULL, &length);
          ASSERT (result != NULL);
+         ASSERT (length == strlen (expected));
          ASSERT (memcmp (result, expected, length) == 0);
          if (o)
            {
@@ -110,26 +108,24 @@ main ()
       for (o = 0; o < 2; o++)
        {
          size_t *offsets = (o ? new_offsets (u8_strlen (input)) : NULL);
-         char *result = NULL;
-         size_t length = 0;
-         int retval = u8_conv_to_encoding ("ISO-8859-1", handler,
-                                           input, u8_strlen (input),
-                                           offsets,
-                                           &result, &length);
+         size_t length = 0xdead;
+         char *result = u8_conv_to_encoding ("ISO-8859-1", handler,
+                                             input, u8_strlen (input),
+                                             offsets,
+                                             NULL, &length);
          switch (handler)
            {
            case iconveh_error:
-             ASSERT (retval == -1 && errno == EILSEQ);
              ASSERT (result == NULL);
-             ASSERT (length == 0);
+             ASSERT (errno == EILSEQ);
+             ASSERT (length == 0xdead);
              break;
            case iconveh_question_mark:
              {
                static const char expected[] = "Rafa? Maszkowski";
                static const char expected_translit[] = "Rafal Maszkowski";
-               ASSERT (retval == 0);
-               ASSERT (length == strlen (expected));
                ASSERT (result != NULL);
+               ASSERT (length == strlen (expected));
                ASSERT (memcmp (result, expected, length) == 0
                        || memcmp (result, expected_translit, length) == 0);
                if (o)
@@ -147,9 +143,8 @@ main ()
            case iconveh_escape_sequence:
              {
                static const char expected[] = "Rafa\\u0142 Maszkowski";
-               ASSERT (retval == 0);
-               ASSERT (length == strlen (expected));
                ASSERT (result != NULL);
+               ASSERT (length == strlen (expected));
                ASSERT (memcmp (result, expected, length) == 0);
                if (o)
                  {
@@ -175,15 +170,13 @@ main ()
       for (o = 0; o < 2; o++)
        {
          size_t *offsets = (o ? new_offsets (u8_strlen (input)) : NULL);
-         char *result = NULL;
-         size_t length = 0;
-         int retval = u8_conv_to_encoding ("ISO-8859-1", handler,
-                                           input, u8_strlen (input),
-                                           offsets,
-                                           &result, &length);
-         ASSERT (retval == 0);
+         size_t length;
+         char *result = u8_conv_to_encoding ("ISO-8859-1", handler,
+                                             input, u8_strlen (input),
+                                             offsets,
+                                             NULL, &length);
+         ASSERT (result != NULL);
          ASSERT (length == strlen (""));
-         /* result may be == NULL or != NULL.  */
          if (o)
            {
              ASSERT (offsets[0] == 0);