Add ls from Andre Renaud.

1 files changed, 113 insertions, 0 deletions

diff --git a/toys/ls.c b/toys/ls.c
new file mode 100644
index 00000000..b9b963ac
--- /dev/null
+++ b/toys/ls.c
@@ -0,0 +1,113 @@
+/* vi: set sw=4 ts=4:
+ *
+ * ls.c - list files
+ *
+ * Copyright 2012 Andre Renaud <andre@bluewatersys.com>
+ *
+ * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/ls.htm
+
+USE_LS(NEWTOY(ls, "F1a", TOYFLAG_USR|TOYFLAG_BIN))
+
+config LS
+	bool "ls"
+	default y
+	help
+	  usage: ls [-F] [-a] [-1] [directory...]
+	  list files
+
+          -F    append a character as a file type indicator
+          -a    list all files
+          -1    list one file per line
+*/
+
+#include "toys.h"
+
+#define FLAG_a 1
+#define FLAG_1 2
+#define FLAG_F 4
+
+static int dir_filter(const struct dirent *d)
+{
+    /* Skip over the . & .. entries unless -a is given */
+    if (!(toys.optflags & FLAG_a))
+        if (d->d_name[0] == '.')
+            return 0;
+    return 1;
+}
+
+static void do_ls(int fd, char *name)
+{
+    struct dirent **entries;
+    int nentries;
+    int i;
+    int maxwidth = -1;
+    int ncolumns;
+
+    if (strcmp(name, "-") == 0)
+        name = ".";
+
+    nentries = scandir(name, &entries, dir_filter, alphasort);
+    if (nentries < 0)
+        perror_exit("ls: cannot access %s'", name);
+
+
+    /* Determine the widest entry so we can flow them properly */
+    if (!(toys.optflags & FLAG_1)) {
+        int columns;
+        char *columns_str;
+
+        for (i = 0; i < nentries; i++) {
+            struct dirent *ent = entries[i];
+            int width;
+
+            width = strlen(ent->d_name);
+            if (width > maxwidth)
+                maxwidth = width;
+        }
+        /* We always want at least a single space for each entry */
+        maxwidth++;
+        if (toys.optflags & FLAG_F)
+            maxwidth++;
+
+        columns_str = getenv("COLUMNS");
+        columns = columns_str ? atoi(columns_str) : 80;
+        ncolumns = columns / maxwidth;
+    }
+
+    for (i = 0; i < nentries; i++) {
+        struct dirent *ent = entries[i];
+        int len = strlen(ent->d_name);
+
+        printf("%s", ent->d_name);
+        if (toys.optflags & FLAG_F) {
+            struct stat st;
+            if (stat(ent->d_name, &st))
+                perror_exit("Can't stat %s", ent->d_name);
+            if (S_ISDIR(st.st_mode)) {
+                printf("/");
+                len++;
+            }
+            if (S_ISREG(st.st_mode) &&
+                (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))) {
+                printf("*");
+                len++;
+            }
+        }
+        if (toys.optflags & FLAG_1)
+            printf("\n");
+        else {
+            if (i % ncolumns == ncolumns - 1)
+                printf("\n");
+            else
+                printf("%*s", maxwidth - len, "");
+        }
+    }
+    /* Make sure we put at a trailing new line in */
+    if (!(toys.optflags & FLAG_1) && (i % ncolumns))
+        printf("\n");
+}
+
+void ls_main(void)
+{
+    loopfiles(toys.optargs, do_ls);
+}