merge m17n patch

add libwc

libwc/test.c

@@ -0,0 +1,38 @@
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "wc.h"
+
+int
+main(int argc, char **argv)
+{
+  Str s = Strnew();
+  wc_ces old, from, to;
+  FILE *f;
+
+  if (argc < 3) {
+    fprintf(stderr, "wctest <form> <to> [<file>]\n");
+    exit(1);
+  }
+
+  from = wc_guess_charset_short(argv[1], 0);
+  to = wc_guess_charset_short(argv[2], 0);
+  if (argc > 3)
+    f = fopen(argv[3], "r");
+  else
+    f = stdin;
+  if (f == NULL) exit(2);
+  
+  fprintf(stderr, "%s -> %s\n", wc_ces_to_charset(from), wc_ces_to_charset(to));
+  while (1) {
+    s = Strfgets(f);
+    if (!s->length)
+      break;
+    old = from;
+    s = wc_Str_conv_with_detect(s, &from, from, to);
+    if (from != old)
+      fprintf(stderr, "%s ->\n", wc_ces_to_charset(from));
+    printf("%s", s->ptr);
+  }
+  return 0;
+}