1 files changed, 110 insertions, 0 deletions
diff --git a/src/iconv.c b/src/iconv.c
new file mode 100644
index 0000000..a0938d6
--- /dev/null
+++ b/src/iconv.c
@@ -0,0 +1,110 @@
+/*
+ * iconv.c
+ * Implementation of SUSv4 XCU iconv utility
+ * Copyright © 2011 Rich Felker
+ * Licensed under the terms of the GNU General Public License, v2 or later
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <iconv.h>
+#include <locale.h>
+#include <langinfo.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+
+int main(int argc, char **argv)
+{
+	const char *from=0, *to=0;
+	int b;
+	iconv_t cd;
+	char buf[BUFSIZ];
+	char outbuf[BUFSIZ*4];
+	char *in, *out;
+	size_t inb;
+	size_t l;
+	size_t unitsize=0;
+	int err=0;
+	FILE *f;
+
+	while ((b = getopt(argc, argv, "f:t:csl")) != EOF) switch(b) {
+	case 'l':
+		puts("UTF-8, UTF-16BE, UTF-16LE, UTF-32BE, UTF32-LE, UCS-2BE, UCS-2LE, WCHAR_T,\n"
+			"US_ASCII, ISO8859-1, ISO8859-2, ISO8859-3, ISO8859-4, ISO8859-5,\n"
+			"ISO8859-6, ISO8859-7, ...");
+		exit(0);
+	case 'c': case 's': break;
+	case 'f': from=optarg; break;
+	case 't': to=optarg; break;
+	default: exit(1);
+	}
+
+	if (!from || !to) {
+		setlocale(LC_CTYPE, "");
+		if (!to) to = nl_langinfo(CODESET);
+		if (!from) from = nl_langinfo(CODESET);
+	}
+	cd = iconv_open(to, from);
+	if (cd == (iconv_t)-1) {
+		if (iconv_open(to, "WCHAR_T") == (iconv_t)-1)
+			fprintf(stderr, "iconv: destination charset %s", to);
+		else
+			fprintf(stderr, "iconv: source charset %s", from);
+		perror("");
+		exit(1);
+	}
+	if (optind == argc) argv[argc++] = "-";
+
+	for (; optind < argc; optind++) {
+		if (argv[optind][0]=='-' && !argv[optind][1]) {
+			f = stdin;
+			argv[optind] = "(stdin)";
+		} else if (!(f = fopen(argv[optind], "rb"))) {
+			fprintf(stderr, "iconv: %s", argv[optind]);
+			perror("");
+			err = 1;
+			continue;
+		}
+		inb = 0;
+		for (;;) {
+			in = buf;
+			out = outbuf;
+			l = fread(buf+inb, 1, sizeof(buf)-inb, f);
+			inb += l;
+			if (!inb) break;
+			if (iconv(cd, &in, &inb, &out, (size_t [1]){sizeof outbuf})==-1
+			 && errno == EILSEQ) {
+			 	if (!unitsize) {
+			 		wchar_t wc='0';
+			 		char dummy[4], *dummyp=dummy;
+			 		iconv_t cd2 = iconv_open(from, "WCHAR_T");
+			 		if (cd == (iconv_t)-1) {
+			 			unitsize = 1;
+			 		} else {
+			 			iconv(cd2,
+			 				(char *[1]){(char *)&wc},
+			 				(size_t[1]){1},
+			 				&dummyp, (size_t[1]){4});
+			 			unitsize = dummyp-dummy;
+			 			if (!unitsize) unitsize=1;
+			 		}
+			 	}
+			 	inb-=unitsize;
+			 	in+=unitsize;
+			}
+			if (inb && !l && errno==EINVAL) break;
+			if (out>outbuf && !fwrite(outbuf, out-outbuf, 1, stdout)) {
+				perror("iconv: write error");
+				exit(1);
+			}
+			if (inb) memmove(buf, in, inb);
+		}
+		if (ferror(f)) {
+			fprintf(stderr, "iconv: %s", argv[optind]);
+			perror("");
+			err = 1;
+		}
+	}
+	return err;
+}