From 707184fe4e9e5ffa99def9c868027c61f41249fc Mon Sep 17 00:00:00 2001
From: Jakob Kaivo <jkk@ung.org>
Date: Mon, 11 Apr 2022 18:49:28 -0400
Subject: implement -i support

---
 ls.c | 36 ++++++++++++++++++++++++++++++++++--
 1 file changed, 34 insertions(+), 2 deletions(-)

diff --git a/ls.c b/ls.c
index fd6bfa4..cb4e201 100644
--- a/ls.c
+++ b/ls.c
@@ -64,6 +64,7 @@ static enum { GROUP_NAME, GROUP_ID, GROUP_NONE } ls_group = GROUP_NAME;
 static enum { OWNER_NAME, OWNER_ID, OWNER_NONE } ls_owner = OWNER_NAME;
 static enum { MARK_NONE, MARK_DIRS, MARK_ALL } ls_mark = MARK_NONE;
 static enum { BLOCKS_NONE, BLOCKS_POSIX, BLOCKS_KIBI } ls_blocks = BLOCKS_NONE;
+static int ls_print_inodes = 0;
 
 static int recurse = 0;
 static int reverse = 0;
@@ -334,7 +335,13 @@ static void ls_print_long(size_t n, struct file_info files[static n])
 {
 	for (size_t i = 0; i < n; i++) {
 		struct stat st = files[i].st;
+
+		if (ls_print_inodes) {
+			printf("%*ju ", SIZEWIDTH, (uintmax_t)st.st_ino);
+		}
+
 		printf("%s ", ls_file_mode(st));
+
 		printf("%ju ", (uintmax_t)st.st_nlink);
 
 		if (ls_owner != OWNER_NONE) {
@@ -379,6 +386,9 @@ static void ls_print_long(size_t n, struct file_info files[static n])
 static void ls_print_single(size_t n, struct file_info files[static n])
 {
 	for (size_t i = 0; i < n; i++) {
+		if (ls_print_inodes) {
+			printf("%ju ", (uintmax_t)files[i].st.st_ino);
+		}
 		printf("%s\n", ls_filename(files + i));
 	}
 }
@@ -414,8 +424,14 @@ static void ls_print_serial(size_t n, struct file_info files[static n])
 			printf("\n");
 			at = 0;
 		}
+		if (ls_print_inodes) {
+			at += printf("%ju ", (uintmax_t)files[i].st.st_ino);
+		}
 		at += printf("%s, ", ls_filename(files + i));
 	}
+	if (ls_print_inodes) {
+		printf("%ju ", (uintmax_t)files[n - 1].st.st_ino);
+	}
 	printf("%s\n", ls_filename(files + n - 1));
 }
 
@@ -424,17 +440,25 @@ static void ls_print_columns(size_t n, struct file_info files[static n])
 	size_t widest = ls_find_widest(n, files);
 	size_t columns = ls_get_columns();
 	size_t ncolumns = columns / widest;
+	if (ls_print_inodes) {
+		ncolumns /= 2;
+	}
 	size_t nrows = n / ncolumns;
 
-	/* FIXME: partial columns */
+	/* account for partial columns */
 	nrows++;
 
 	char format[32] = "";
 	snprintf(format, sizeof(format), "%%-%zds", widest);
+
 	for (size_t i = 0; i < nrows; i++) {
 		for (size_t j = 0; j < ncolumns; j++) {
 			size_t fn = i + (nrows * j);
 			if (fn < n) {
+				if (ls_print_inodes) {
+					printf("%ju ",
+						(uintmax_t)files[fn].st.st_ino);
+				}
 				printf(format, ls_filename(files + fn));
 			}
 		}
@@ -447,9 +471,17 @@ static void ls_print_rows(size_t n, struct file_info files[static n])
 	size_t widest = ls_find_widest(n, files);
 	size_t columns = ls_get_columns();
 	size_t ncolumns = columns / widest;
+	if (ls_print_inodes) {
+		ncolumns /= 2;
+	}
+
 	char format[32] = "";
 	snprintf(format, sizeof(format), "%%-%zds", widest);
+
 	for (size_t i = 0; i < n; i++) {
+		if (ls_print_inodes) {
+			printf("%ju ", (uintmax_t)files[i].st.st_ino);
+		}
 		printf(format, ls_filename(files + i));
 		if (i % ncolumns == ncolumns - 1) {
 			printf("\n");
@@ -555,7 +587,7 @@ int main(int argc, char *argv[])
 			break;
 
 		case 'i':	/** include file serial numbers **/
-			//format |= INODES;
+			ls_print_inodes = 1;
 			break;
 
 		case 'k':	/** use a blocksize of 1024 **/
-- 
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