1 files changed, 70 insertions, 0 deletions
diff --git a/toys/dos2unix.c b/toys/dos2unix.c
new file mode 100644
index 00000000..01c90536
--- /dev/null
+++ b/toys/dos2unix.c
@@ -0,0 +1,70 @@
+/* vi: set sw=4 ts=4:
+ *
+ * dos2unix.c - convert newline format
+ *
+ * Copyright 2012 Rob Landley <rob@landley.net>
+ *
+ * No standard
+
+USE_DOS2UNIX(NEWTOY(dos2unix, NULL, TOYFLAG_BIN))
+USE_DOS2UNIX(OLDTOY(unix2dos, dos2unix, NULL, TOYFLAG_BIN))
+
+config DOS2UNIX
+	bool "dos2unix/unix2dos"
+	default y
+	help
+	  usage: dos2unix/unix2dos [file...]
+
+	  Convert newline format between dos (\r\n) and unix (just \n)
+	  If no files listed copy from stdin, "-" is a synonym for stdin.
+*/
+
+#include "toys.h"
+
+DEFINE_GLOBALS(
+	char *tempfile;
+)
+
+#define TT this.dos2unix
+
+static void do_dos2unix(int fd, char *name)
+{
+	char c = toys.which->name[0];
+	int outfd = 1, catch = 0;
+
+	if (fd) outfd = copy_tempfile(fd, name, &TT.tempfile);
+
+	for (;;) {
+		int len, in, out;
+
+		len = read(fd, toybuf+(sizeof(toybuf)/2), sizeof(toybuf)/2);
+		if (len<0) {
+			perror_msg("%s",name);
+			toys.exitval = 1;
+		}
+		if (len<1) break;
+
+		for (in = out = 0; in < len; in++) {
+			char x = toybuf[in+sizeof(toybuf)/2];
+
+			// Drop \r only if followed by \n in dos2unix mode
+			if (catch) {
+				if (c == 'u' || x != '\n') toybuf[out++] = '\r';
+				catch = 0;
+			// Add \r only if \n not after \r in unix2dos mode
+			} else if (c == 'u' && x == '\n') toybuf[out++] = '\r';
+
+			if (x == '\r') catch++;
+			else toybuf[out++] = x;
+		}
+		xwrite(outfd, toybuf, out);
+	}
+	if (catch) xwrite(outfd, "\r", 1);
+
+	if (fd) replace_tempfile(-1, outfd, &TT.tempfile);
+}
+
+void dos2unix_main(void)
+{
+	loopfiles(toys.optargs, do_dos2unix);
+}