Recover properly if the character conversion fails.

diff --git a/uip/mhshowsbr.c b/uip/mhshowsbr.c
index 056c2f4..02b3641 100644 (file)
--- a/uip/mhshowsbr.c
+++ b/uip/mhshowsbr.c
@@ -1080,6 +1080,7 @@ convert_charset (CT ct, char *dest_charset, int *message_mods) {
        char *dest_buffer = mh_xmalloc(dest_buffer_size);
         HF hf;
         char *tempfile;
+       int fromutf8 = !strcasecmp(src_charset, "UTF-8");
 
         if ((conv_desc = iconv_open (dest_charset, src_charset)) ==
             (iconv_t) -1) {
@@ -1149,6 +1150,30 @@ iconv_start:
                        outbytes_before += bumpup;
                        goto iconv_start;
                    }
+                   if (errno == EINVAL) {
+                       /* middle of multi-byte sequence */
+                       write (fd, dest_buffer, outbytes_before - outbytes);
+                       fseeko (*fp, -inbytes, SEEK_CUR);
+                       if (end > 0) bytes_to_read += inbytes;
+                       /* advise(NULL, "convert_charset: EINVAL"); */
+                       continue;
+                   }
+                   if (errno == EILSEQ) {
+                       /* invalid multi-byte sequence */
+                       if (fromutf8) {
+                           for (++ib, --inbytes;
+                                inbytes > 0 &&
+                                       (((unsigned char) *ib) & 0xc0) == 0x80;
+                                ++ib, --inbytes)
+                               continue;
+                       } else {
+                           ib++; inbytes--; /* skip it */
+                       }
+                       (*ob++) = '?'; outbytes --;
+                       /* advise(NULL, "convert_charset: EILSEQ"); */
+                       goto iconv_start;
+                   }
+                   advise (NULL, "convert_charset: errno = %d", errno);
                     status = NOTOK;
                     break;
                 } else {