docs/diff-options: clarify scope of diff-filter types

diff --git a/utf8.c b/utf8.c
index 00e10c86ad7ea7bcc2d53a90a2f608dd66d47462..0c8e011a58cae3c683851007ec81828ad8284471 100644 (file)
--- a/utf8.c
+++ b/utf8.c
@@ -489,6 +489,28 @@ char *reencode_string_iconv(const char *in, size_t insz, iconv_t conv, int *outs
        return out;
 }
 
+static const char *fallback_encoding(const char *name)
+{
+       /*
+        * Some platforms do not have the variously spelled variants of
+        * UTF-8, so let's fall back to trying the most official
+        * spelling. We do so only as a fallback in case the platform
+        * does understand the user's spelling, but not our official
+        * one.
+        */
+       if (is_encoding_utf8(name))
+               return "UTF-8";
+
+       /*
+        * Even though latin-1 is still seen in e-mail
+        * headers, some platforms only install ISO-8859-1.
+        */
+       if (!strcasecmp(name, "latin-1"))
+               return "ISO-8859-1";
+
+       return name;
+}
+
 char *reencode_string_len(const char *in, int insz,
                          const char *out_encoding, const char *in_encoding,
                          int *outsz)
@@ -501,17 +523,9 @@ char *reencode_string_len(const char *in, int insz,
 
        conv = iconv_open(out_encoding, in_encoding);
        if (conv == (iconv_t) -1) {
-               /*
-                * Some platforms do not have the variously spelled variants of
-                * UTF-8, so let's fall back to trying the most official
-                * spelling. We do so only as a fallback in case the platform
-                * does understand the user's spelling, but not our official
-                * one.
-                */
-               if (is_encoding_utf8(in_encoding))
-                       in_encoding = "UTF-8";
-               if (is_encoding_utf8(out_encoding))
-                       out_encoding = "UTF-8";
+               in_encoding = fallback_encoding(in_encoding);
+               out_encoding = fallback_encoding(out_encoding);
+
                conv = iconv_open(out_encoding, in_encoding);
                if (conv == (iconv_t) -1)
                        return NULL;