iconv is actually something I'm missing on my current musl based system.

Attached is a simple version using the libc's iconv.

1 files changed, 67 insertions, 0 deletions

diff --git a/toys/pending/iconv.c b/toys/pending/iconv.c
new file mode 100644
index 00000000..d9f28176
--- /dev/null
+++ b/toys/pending/iconv.c
@@ -0,0 +1,67 @@
+/* iconv.c - Convert character encoding
+ *
+ * Copyright 2014 Felix Janda <felix.janda@posteo.de>
+ *
+ * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/
+
+USE_ICONV(NEWTOY(iconv, "t:f:", TOYFLAG_USR|TOYFLAG_BIN))
+
+config ICONV
+  bool "iconv"
+  default n
+  help
+    usage: iconv [-f FROM] [-t TO] [FILE...]
+
+    Convert character encoding of files.
+
+    -f  convert from (default utf8)
+    -t  convert to   (default utf8)
+
+*/
+
+#define FOR_iconv
+#include "toys.h"
+#include <iconv.h>
+
+GLOBALS(
+  char *from;
+  char *to;
+)
+
+iconv_t ic; // Can't be put into GLOBALS because iconv_t is defined in iconv.h
+
+static void do_iconv(int fd, char *name)
+{
+  size_t inleft = 0, outleft = 2048;
+  char *in = toybuf, *out = toybuf + 2048;
+
+  while (1) {
+    if (!inleft || (errno == EINVAL)) {
+      memmove(in, toybuf, inleft);
+      if (!(inleft += read(fd, toybuf + inleft, 2048 - inleft))) {
+        xwrite(1, toybuf + 2048, 2048 - outleft);
+        break;
+      }
+      in = toybuf;
+    } else if (errno == E2BIG) {
+      xwrite(1, toybuf + 2048, 2048 - outleft);
+      out = toybuf + 2048;
+      outleft = 2048;
+    } else if (errno == EILSEQ) {
+      in++;
+      inleft--;
+    }
+    if (iconv(ic, &in, &inleft, &out, &outleft) != (size_t)-1) errno = 0;
+  }
+}
+
+void iconv_main(void)
+{
+  char *from = "utf8", *to = "utf8";
+
+  if (toys.optflags & FLAG_f) from = TT.from;
+  if (toys.optflags & FLAG_t) to = TT.to;
+  if ((ic = iconv_open(to, from)) == (iconv_t)-1) error_exit("iconv_open");
+  loopfiles(toys.optargs, do_iconv);
+  if (CFG_TOYBOX_FREE) iconv_close(ic);
+}