cmd: Add shell prototype

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 106 insertions, 0 deletions

diff --git a/src/cmd/hush/hush.c b/src/cmd/hush/hush.c
new file mode 100644
index 0000000..ade7b4e
--- /dev/null
+++ b/src/cmd/hush/hush.c
@@ -0,0 +1,106 @@
+/*
+ * Copyright (c) 2025 Ian Marco Moffett and L5 engineers
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the project nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/spawn.h>
+#include <sys/iotap.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <ctype.h>
+#include <string.h>
+
+/* XXX: Hardcoded for now, will change */
+#define PROMPT "[sv@l5]: "
+
+/*
+ * Read input from an input device
+ *
+ * @buf: Buffer to fill with input
+ * @maxlen: Max length of buffer
+ */
+static void
+read_input(char *buf, size_t maxlen)
+{
+    ssize_t retval;
+    size_t i = 0;
+    char c = '\0';
+    struct iotap_msg msg = {
+        .opcode = IOTAP_OPC_READ,
+        .buf = &c,
+        .len = 1
+    };
+
+    if (buf == NULL) {
+        return;
+    }
+
+    /*
+     * Read all the input until we hit a '\n'
+     */
+    do {
+        retval = iotap_mux("input.igkbd", &msg);
+        if (retval < 0) {
+            continue;
+        }
+
+        if (!isascii(c)) {
+            continue;
+        }
+
+        if (c != '\n' && i < maxlen) {
+            buf[i++] = c;
+            write(STDOUT_FILENO, &c, 1);
+        }
+
+    } while (c != '\n');
+}
+
+int
+main(void)
+{
+    char buf[128];
+    ssize_t retval;
+
+    for (;;) {
+        write(STDOUT_FILENO, PROMPT, sizeof(PROMPT) - 1);
+        read_input(buf, sizeof(buf));
+        write(STDOUT_FILENO, "\n", 1);
+
+        /* XXX: For initial demonstration */
+        if (strcmp(buf, "hello") == 0) {
+            puts("meow!!");
+        } else {
+            puts("mrrp?");
+        }
+
+        buf[0] = '\0';
+        memset(buf, 0, sizeof(buf));
+    }
+
+    return 0;
+}