From 106fee9debcd9f1b280133b235ec16a1984f6cd6 Mon Sep 17 00:00:00 2001
From: Luo Jinghua <sunmoon1997@gmail.com>
Date: Fri, 8 Jan 2010 15:05:08 +0800
Subject: uconv2: add another test program

---
 uconv2.c | 158 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 158 insertions(+)
 create mode 100644 uconv2.c

diff --git a/uconv2.c b/uconv2.c
new file mode 100644
index 0000000..3fb43df
--- /dev/null
+++ b/uconv2.c
@@ -0,0 +1,158 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <iconv.h>
+#include <assert.h>
+#include <errno.h>
+
+static char*
+convert (const char *str,
+	 size_t        len,
+	 iconv_t       converter,
+	 size_t       *bytes_read,
+	 size_t       *bytes_written)
+{
+    char *dest;
+    char *outp;
+    const char *p;
+    size_t inbytes_remaining;
+    size_t outbytes_remaining;
+    size_t err;
+    size_t outbuf_size;
+    int have_error = 0;
+    int done = 0;
+    int reset = 0;
+
+    p = str;
+    inbytes_remaining = len;
+    outbuf_size = len + 1; /* + 1 for nul in case len == 1 */
+
+    outbytes_remaining = outbuf_size - 1; /* -1 for nul */
+    outp = dest = malloc (outbuf_size);
+
+    while (!done && !have_error) {
+	if (reset)
+	    err = iconv (converter, NULL, &inbytes_remaining, &outp,
+			 &outbytes_remaining);
+	else
+	    err = iconv (converter, (char **)&p, &inbytes_remaining,
+			 &outp, &outbytes_remaining);
+
+	if (err == (size_t) -1) {
+	    switch (errno)
+	    {
+	    case EINVAL:
+		/* Incomplete text, do not report an error */
+		done = 1;
+		break;
+	    case E2BIG:
+	    {
+		size_t used = outp - dest;
+		printf ("used: %zd, %zd(%zd)\n",
+			used, inbytes_remaining, len);
+
+		outbuf_size *= 2;
+		dest = realloc (dest, outbuf_size);
+
+		outp = dest + used;
+		outbytes_remaining = outbuf_size - used - 1; /* -1 for nul */
+	    }
+	    break;
+	    case EILSEQ:
+		have_error = 1;
+		break;
+	    default:
+		have_error = 1;
+		break;
+	    }
+	} else {
+	    if (!reset) {
+		/* call iconv with NULL inbuf to cleanup shift state */
+		reset = 1;
+		inbytes_remaining = 0;
+	    } else {
+		done = 1;
+	    }
+	}
+    }
+
+    *outp = '\0';
+    if (bytes_read) {
+	*bytes_read = p - str;
+    } else {
+	if ((p - str) != len) {
+	    if (!have_error)
+		have_error = 1;
+	}
+    }
+
+    if (bytes_written)
+	*bytes_written = outp - dest;	/* Doesn't include '\0' */
+
+    if (have_error) {
+	free (dest);
+	return NULL;
+    }
+
+    return dest;
+}
+
+#define UCONV_BUFSZ 4096
+int main(int argc, char **argv)
+{
+    FILE *infp, *outfp;
+    const char *from, *to;
+    iconv_t conv;
+    char *inbuf;
+    char *outbuf;
+    size_t inlen;
+    size_t outlen;
+
+    if (argc < 5)
+	return -1;
+
+    from = argv[1];
+    to = argv[2];
+
+    conv = iconv_open(to, from);
+    if (conv == (iconv_t)-1) {
+	fprintf (stderr,
+		 "Converting from %s to %s is unsupported.\n",
+		 from, to);
+	return -1;
+    }
+
+    infp = fopen(argv[3], "rb");
+    if (!infp)
+	return -1;
+
+    fseek(infp, 0, SEEK_END);
+    inlen = ftell(infp);
+    fseek(infp, 0, SEEK_SET);
+    inbuf = malloc(sizeof(char) * (inlen + 1));
+    if (!inbuf)
+	return -1;
+
+    fread(inbuf, 1, inlen, infp);
+    outbuf = convert(inbuf, inlen, conv, NULL, &outlen);
+    if (!outbuf) {
+	fprintf(stderr, "Failed to convert.\n");
+    }
+
+    outfp = fopen(argv[4], "wb");
+    if (!outfp)
+	return -1;
+
+    if (outbuf)
+	fwrite(outbuf, 1, outlen, outfp);
+
+    free(inbuf);
+    free(outbuf);
+
+    fclose(outfp);
+    fclose(infp);
+
+    iconv_close(conv);
+
+    return 0;
+}
-- 
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