From d62e5c1df92ee159d0203b75adebb50faf45badb Mon Sep 17 00:00:00 2001
From: Nicholas Noll <nbnoll@eml.cc>
Date: Thu, 18 Jun 2020 19:46:25 -0700
Subject: feat: small filesystem walker added

---
 sys/cmd/walk/rules.mk | 13 ++++++++
 sys/cmd/walk/walk.c   | 82 +++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 95 insertions(+)
 create mode 100644 sys/cmd/walk/rules.mk
 create mode 100644 sys/cmd/walk/walk.c

(limited to 'sys/cmd/walk')

diff --git a/sys/cmd/walk/rules.mk b/sys/cmd/walk/rules.mk
new file mode 100644
index 0000000..ee2321a
--- /dev/null
+++ b/sys/cmd/walk/rules.mk
@@ -0,0 +1,13 @@
+include share/push.mk
+
+# Local sources
+SRCS_$(d) := $(d)/walk.c
+BINS_$(d) := $(d)/walk
+
+include share/paths.mk
+
+# Local rules
+$(BINS_$(d)): $(OBJS_$(d)) $(OBJ_DIR)/libn/libn.a
+	$(COMPLINK)
+
+include share/pop.mk
diff --git a/sys/cmd/walk/walk.c b/sys/cmd/walk/walk.c
new file mode 100644
index 0000000..12f6c55
--- /dev/null
+++ b/sys/cmd/walk/walk.c
@@ -0,0 +1,82 @@
+#include <u.h>
+#include <libn.h>
+
+static char buf[4*1024], *c = buf; /* should be greater or equal to PATH_MAX */
+
+static
+void
+flush(void)
+{
+    *c = 0;
+    puts(buf);
+    c  = buf;
+}
+
+static
+void
+print(void *data, char *rel, char *abs, io·Stat *info)
+{
+copy:
+    while (*abs && c < (arrend(buf)-2))
+        *c++ = *abs++;
+
+    if (*abs) {
+        flush();
+        goto copy;
+    }
+    *c++ = '\n';
+}
+
+static
+void
+usage(void)
+{
+    fprintf(stderr, "usage: walk [-dlpv] file ...\n");
+    exit(1);
+}
+
+int
+main(int argc, char *argv[])
+{
+    int i, f = fs·nolinks, err, max = 0;
+    char *p;
+    static fs·Walker walker;
+
+    ARGBEGIN{
+    case 'd':
+        max = atoi(ARGF());
+        break;
+    case 'l':
+        f ^= fs·nolinks;
+        break;
+    case 'p':
+        f |= fs·preorder;
+        break;
+    case 'v':
+        f |= fs·verbose;
+        break;
+    default:
+        usage();
+    }ARGEND;
+
+    walker.flags = f;
+    walker.func  = print;
+    walker.data  = nil;
+    walker.max   = max;
+
+    if (argc == 0) {
+        fs·init(&walker, "");
+        fs·walk(&walker);
+        return(err = walker.err);
+    } else {
+        err = 0;
+        for (i=0; i<argc; i++) {
+            fs·init(&walker, argv[i]); 
+            fs·walk(&walker);
+            err += walker.err;
+        }
+    }
+    fs·fini(&walker);
+    flush();
+    exit(err);
+}
-- 
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