bore

commit bd456465521b7cc55684a21531b27c712faa4138
parent 5be17e6aac924783632031feecb1442dc0f75f3d
Author: phoebos <ben@bvnf.space>
Date:   Mon, 20 Sep 2021 21:33:21 +0100

ls: add

Diffstat:
M
Makefile
 | 
1
+
A
ls.c
 | 
74
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

2 files changed, 75 insertions(+), 0 deletions(-)
diff --git a/Makefile b/Makefile
@@ -4,6 +4,7 @@ BINS = \
 	cat \
 	echo \
 	false \
+	ls \
 	tee \
 	true \
 
diff --git a/ls.c b/ls.c
@@ -0,0 +1,74 @@
+#include <dirent.h>
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+enum {
+    FLAG_1 = 1 << 0
+};
+
+int
+ls(const char *path, int flags) {
+    struct stat st;
+    if (lstat(path, &st) == -1) {
+        fprintf(stderr, "ls: %s: %s\n", path, strerror(errno));
+        return 1;
+    }
+    if (S_ISDIR(st.st_mode)) {
+        /* directory */
+        DIR *dir = opendir(path);
+        if (dir == NULL) {
+            fprintf(stderr, "ls: %s: %s\n", path, strerror(errno));
+            return 1;
+        }
+
+        struct dirent *dp;
+        while ((dp = readdir(dir)) != NULL) {
+            printf("%s", dp->d_name);
+
+            if (flags & FLAG_1)
+                putc('\n', stdout);
+            else
+                putc(' ', stdout);
+        }
+    } else {
+        /* file */
+        printf("%s", path);
+        if (flags & FLAG_1)
+            putc('\n', stdout);
+        else
+            putc(' ', stdout);
+    }
+    return 0;
+}
+
+int
+main(int argc, char **argv) {
+    int c, flags, ret_val;
+    flags = ret_val = 0;
+
+    while ((c = getopt(argc, argv, "1l")) != -1) {
+        switch (c) {
+            case '1':
+            case 'l':
+                flags |= FLAG_1;
+                break;
+        }
+    }
+    argv += optind - 1;
+
+    if(!isatty(1))
+        flags |= FLAG_1;
+
+    if (argc == optind)
+        ret_val = ls(".", flags);
+    else while (*++argv)
+        ret_val = ls(*argv, flags);
+
+    if (!flags & FLAG_1)
+        puts(""); /* final newline */
+
+    return ret_val;
+}