Convert CR-delimited text to LF-delimited

txt.c

@@ -0,0 +1,78 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+int
+istxt (FILE *f)
+{
+	int nch = 0;
+	int ncr = 0;
+	int c;
+
+	while ((c = getc (f)) != EOF) {
+		nch++;
+
+		if (c == '\r')
+			ncr++;
+		if (c == '\n')
+			return 0;
+	}
+
+	if (ncr > (nch / 80))
+		return 1;
+	else
+		return 0;
+}
+
+int
+main (int argc, char **argv)
+{
+	int i;
+
+	for (i = 1; i < argc; i++) {
+		FILE *f = fopen (argv[i], "r");
+		int iftxt;
+
+		if (!f) {
+			fprintf (stderr, "%s: %s: %s\n", argv[0], argv[i],
+				 strerror (errno));
+			continue;
+		}
+
+		if (istxt (f)) {
+			char *ofn;
+			FILE *of;
+			int c;
+
+			ofn = malloc (strlen (argv[i]) + 4 + 1);
+			if (!ofn)
+				abort();
+
+			sprintf (ofn, "%s.txt", argv[i]);
+			printf ("%s\n", ofn);
+
+			of = fopen (ofn, "w");
+			if (!of) {
+				fprintf (stderr, "%s: %s: %s\n", argv[0],
+					 ofn, strerror (errno));
+				fclose (f);
+				free (ofn);
+				continue;
+			}
+
+			rewind (f);
+			while ((c = getc (f)) != EOF) {
+				if (c == '\r')
+					putc ('\n', of);
+				else
+					putc (c, of);
+			}
+
+			fclose (of);
+			free (ofn);
+		}
+
+		fclose (f);
+	}
+}