From 5b5e96599e90a94c5d8f40e570c56faec8af9dc1 Mon Sep 17 00:00:00 2001
From: Luo Jinghua <sunmoon1997@gmail.com>
Date: Fri, 8 Jan 2010 15:04:40 +0800
Subject: uniconv: be compatible with system's iconv

---
 uniconv.c | 57 +++++++++++++++++++++++++++++++++------------------------
 1 file changed, 33 insertions(+), 24 deletions(-)

diff --git a/uniconv.c b/uniconv.c
index 22a70ee..7e9fe1e 100644
--- a/uniconv.c
+++ b/uniconv.c
@@ -94,8 +94,6 @@ uniconv_conv(uniconv_t *uc,
 	     size_t *outleft)
 {
     int ret;
-    uc_char_t local_ucs4[UNICONV_MAX_LOCAL];
-    uc_char_t *ucs4, *inucs4;
     size_t ucs4len;
     const char *saved_inbuf;
     const char *saved_outbuf;
@@ -112,38 +110,49 @@ uniconv_conv(uniconv_t *uc,
 
     /* converting/pushing input data */
     if (inbuf) {
-	if (*inleft < UNICONV_MAX_LOCAL)
-	    ucs4 = local_ucs4;
-	else
-	    ucs4 = malloc(sizeof(uc_char_t) * (*inleft));
-	if (!ucs4)
-	    return UNICONV_EINVAL;
+	uc_char_t ucs4;
+	uc_char_t *ucsbuf;
 
-	inucs4 = ucs4;
-	ucs4len = *inleft;
 	saved_inbuf = *inbuf;
 	saved_outbuf = *outbuf;
-	ret = uc->from->decode(uc->from, inbuf, *inleft, &inucs4, ucs4len);
-	*inleft -= *inbuf - saved_inbuf;
-	if (ret)
-	    goto error_decode;
-
-	ucs4len = inucs4 - ucs4;
-	inucs4 = ucs4;
-	ret = uc->to->encode(uc->to, (const ucs4_t **)&inucs4, ucs4len,
-			     outbuf, *outleft);
+	while (*inleft) {
+	    size_t i = 0;
+	    const char *abuf;
+	    const char *aoutbuf;
+
+	    /* decode a char at a time */
+	    for (i = 1; i <= *inleft; i++) {
+		ucsbuf = &ucs4;
+		abuf = *inbuf;
+		ret = uc->from->decode(uc->from, &abuf, i, &ucsbuf, 1);
+		if (ret < 0 && ret == UNICONV_EINVAL)
+		    continue;
+		break;
+	    }
+	    if (ret == UNICONV_E2BIG)
+		ret = UNICONV_EILSEQ;
+	    if (ret < 0)
+		return ret;
+
+	    ucs4len = ucsbuf - &ucs4;
+	    ucsbuf = &ucs4;
+	    aoutbuf = *outbuf;
+	    ret = uc->to->encode(uc->to, (const ucs4_t **)&ucsbuf, ucs4len,
+				 outbuf, *outleft);
+	    *outleft -= *outbuf - aoutbuf;
+	    if (ret < 0)
+		break;
+	    *inleft -= i;
+	    (*inbuf) += i;
+	}
     } else {
-	ucs4 = NULL;
 	/* converting pending data in buffer */
 	saved_inbuf = NULL;
 	saved_outbuf = *outbuf;
 	ret = uc->to->encode(uc->to, NULL, 0, outbuf, *outleft);
+	*outleft -= *outbuf - saved_outbuf;
     }
-    *outleft -= *outbuf - saved_outbuf;
 
- error_decode:
-    if (ucs4 && ucs4 != local_ucs4)
-	free (ucs4);
     return ret;
 }
 
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