1 files changed, 45 insertions, 0 deletions
diff --git a/user/save.c b/user/save.c
new file mode 100644
index 0000000..b3664f4
--- /dev/null
+++ b/user/save.c
@@ -0,0 +1,45 @@
+#include "user.h"
+
+void _start(const char* arg, unsigned long arglen)
+{
+    if (arglen == 0 || arglen >= 64)
+    {
+        put("usage: run save <path>\n");
+        sys_exit(1);
+    }
+
+    char name[64];
+    for (unsigned long i = 0; i < arglen; i++)
+        name[i] = arg[i];
+    name[arglen] = 0;
+
+    put("saving to ");
+    put(name);
+    put(" -- type lines, a single . saves\n");
+
+    char buffer[4096];
+    int length = 0;
+    for (;;)
+    {
+        char line[256];
+        int n = read_line(line, 256);
+        put("\n");
+        if (n == 1 && line[0] == '.')
+            break;
+        for (int i = 0; i < n && length < 4000; i++)
+            buffer[length++] = line[i];
+        if (length < 4000)
+            buffer[length++] = '\n';
+    }
+
+    if (sys_fs_write(name, buffer, (unsigned long)length))
+    {
+        put("saved ");
+        put(name);
+        put("\n");
+    }
+    else
+        put("write failed\n");
+
+    sys_exit(0);
+}