1 files changed, 104 insertions, 0 deletions
diff --git a/expand.c b/expand.c
new file mode 100644
index 0000000..d65b9d9
--- /dev/null
+++ b/expand.c
@@ -0,0 +1,104 @@
+/*
+ * UNG's Not GNU
+ *
+ * Copyright (c) 2011-2017, Jakob Kaivo <jkk@ung.org>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+#define _XOPEN_SOURCE 700
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+static int tabstop = 8;
+//static int *tablist = NULL;
+
+static int expand(const char *path)
+{
+	FILE *f = stdin;
+	if (path) {
+		f = fopen(path, "rb");
+	}
+
+	if (f == NULL) {
+		fprintf(stderr, "expand: Couldn't open %s: %s\n", path ? path : "stdin", strerror(errno));
+		return 1;
+	}
+
+	int col = 0;
+	while (!feof(f)) {
+		int c = fgetc(f);
+		if (c != '\t') {
+			if (c == '\n') {
+				col = 0;
+			} else if (c == '\b') {
+				col--;
+			} else {
+				col++;
+			}
+			putchar(c);
+			continue;
+		}
+
+		if (tabstop != 0) {
+			do {
+				putchar(' ');
+				col++;
+			} while (col % tabstop);
+			continue;
+		}
+
+		/* TODO: next tabstop in tablist */
+	}
+
+	if (f != stdin) {
+		fclose(f);
+	}
+
+	return 0;
+}
+
+static int set_tablist(const char *list)
+{
+	tabstop = atoi(list);
+	return 0;
+}
+
+int main(int argc, char *argv[])
+{
+	int c;
+	while ((c = getopt(argc, argv, "t:")) != -1) {
+		switch (c) {
+		case 't':	/** set tabs to [tablist] **/
+			if (set_tablist(optarg) != 0) {
+				return 1;
+			}
+			break;
+
+		default:
+			return 1;
+		}
+	}
+
+	int r = 0;
+
+	do {
+		r |= expand(argv[optind++]);
+	} while (optind < argc);
+
+	return r;
+}