Fixed bug #455

If passed "" for the character set, let iconv_open() interpret it as
locale.

This was merged from revision 3234,3235 from SDL 1.2

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%402503

src/stdlib/SDL_iconv.c

@@ -111,10 +111,8 @@ static struct
     int format;
 } encodings[] = {
 /* *INDENT-OFF* */
-    { "646", ENCODING_ASCII },
     { "ASCII", ENCODING_ASCII },
     { "US-ASCII", ENCODING_ASCII },
-    { "LATIN1", ENCODING_LATIN1 },
     { "8859-1", ENCODING_LATIN1 },
     { "ISO-8859-1", ENCODING_LATIN1 },
     { "UTF8", ENCODING_UTF8 },
@@ -138,6 +136,27 @@ static struct
 /* *INDENT-ON* */
 };
 
+static const char *
+getlocale()
+{
+    const char *lang;
+
+    lang = SDL_getenv("LC_ALL");
+    if (!lang) {
+        lang = SDL_getenv("LC_CTYPE");
+    }
+    if (!lang) {
+        lang = SDL_getenv("LC_MESSAGES");
+    }
+    if (!lang) {
+        lang = SDL_getenv("LANG");
+    }
+    if (!lang || !*lang || SDL_strcmp(lang, "C") == 0) {
+        lang = "ASCII";
+    }
+    return lang;
+}
+
 SDL_iconv_t
 SDL_iconv_open(const char *tocode, const char *fromcode)
 {
@@ -145,6 +164,12 @@ SDL_iconv_open(const char *tocode, const char *fromcode)
     int dst_fmt = ENCODING_UNKNOWN;
     int i;
 
+    if (!fromcode || !*fromcode) {
+        fromcode = getlocale();
+    }
+    if (!tocode || !*tocode) {
+        fromcode = getlocale();
+    }
     for (i = 0; i < SDL_arraysize(encodings); ++i) {
         if (SDL_strcasecmp(fromcode, encodings[i].name) == 0) {
             src_fmt = encodings[i].format;
@@ -805,13 +830,17 @@ SDL_iconv_string(const char *tocode, const char *fromcode, const char *inbuf,
     size_t outbytesleft;
     size_t retCode = 0;
 
-    if (!fromcode || !*fromcode) {
-        fromcode = getlocale();
-    }
-    if (!tocode || !*tocode) {
-        tocode = getlocale();
-    }
     cd = SDL_iconv_open(tocode, fromcode);
+    if (cd == (SDL_iconv_t) - 1) {
+        /* See if we can recover here (fixes iconv on Solaris 11) */
+        if (!tocode || !*tocode) {
+            tocode = "UTF-8";
+        }
+        if (!fromcode || !*fromcode) {
+            tocode = "UTF-8";
+        }
+        cd = SDL_iconv_open(tocode, fromcode);
+    }
     if (cd == (SDL_iconv_t) - 1) {
         return NULL;
     }