[i18n 6/6] i18n: Handle EINVAL more gracefully.

[Ben Pfaff]

EINVAL indicates an invalid multibyte sequence at the end of buffer.  It
seems to me that there is no point in swallowing up a single byte and going
on at that point; instead, one might as well just declare the conversion
done after adding the fallback character.  This is what this commit does.
---
 src/libpspp/i18n.c |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/libpspp/i18n.c b/src/libpspp/i18n.c
index d9b42cb..60dc693 100644
--- a/src/libpspp/i18n.c
+++ b/src/libpspp/i18n.c
@@ -118,11 +118,16 @@ try_recode (iconv_t conv,
                 &op, &outbytes) == -1)
     switch (errno)
       {
-      case EILSEQ:
       case EINVAL:
-        if (outbytes == 0)
+        if (outbytes < 2)
           return false;
+        *op++ = fallbackchar;
+        *op++ = '\0';
+        return true;
 
+      case EILSEQ:
+        if (outbytes == 0)
+          return false;
         *op++ = fallbackchar;
         outbytes--;
         ip++;
-- 
1.7.1