From 92d4f9dae64ab5325feca1f39e5955415e8275b9 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Fri, 18 Apr 2025 21:50:44 -0400
Subject: usr.bin: Add basic "shell"

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 usr.bin/link.ld      |  26 ++++++++++++
 usr.bin/osh/Makefile |   6 +++
 usr.bin/osh/osh.c    | 118 +++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 150 insertions(+)
 create mode 100644 usr.bin/link.ld
 create mode 100644 usr.bin/osh/Makefile
 create mode 100644 usr.bin/osh/osh.c

(limited to 'usr.bin')

diff --git a/usr.bin/link.ld b/usr.bin/link.ld
new file mode 100644
index 0000000..9fad881
--- /dev/null
+++ b/usr.bin/link.ld
@@ -0,0 +1,26 @@
+ENTRY(_start)
+
+SECTIONS
+{
+    . = 0x10000;
+
+    .text :
+    {
+        *(.text)
+        *(.text.*)
+    }
+
+    .data : ALIGN(8)
+    {
+        *(.data)
+        *(.data.*)
+    }
+
+    .bss : ALIGN(8)
+    {
+        __bss_start = .;
+        *(.bss)
+        *(.bss.*)
+        __bss_end = .;
+    }
+}
diff --git a/usr.bin/osh/Makefile b/usr.bin/osh/Makefile
new file mode 100644
index 0000000..28981fe
--- /dev/null
+++ b/usr.bin/osh/Makefile
@@ -0,0 +1,6 @@
+include user.mk
+
+CFILES = $(shell find . -name "*.c")
+
+osh:
+	$(CC) $(CFILES) -o $@ $(INTERNAL_CFLAGS)
diff --git a/usr.bin/osh/osh.c b/usr.bin/osh/osh.c
new file mode 100644
index 0000000..dea4b3f
--- /dev/null
+++ b/usr.bin/osh/osh.c
@@ -0,0 +1,118 @@
+/*
+ * Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
+ * 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 Hyra 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/types.h>
+#include <sys/cdefs.h>
+#include <fcntl.h>
+#include <stddef.h>
+#include <unistd.h>
+#include <string.h>
+
+#define prcons(FD, STR) write((FD), (STR), strlen((STR)))
+#define is_ascii(C) ((C) >= 0 && (C) <= 128)
+#define WELCOME \
+    ":::::::::::::::::::::::::::::::::::::::\n" \
+    ":: OSMORA GATEWAY ~ Every key echos  ::\n" \
+    ":: ..... Proceed with purpose .....  ::\n" \
+    ":::::::::::::::::::::::::::::::::::::::\n"
+
+#define CMD_ECHO "echo"
+
+static char buf[64];
+static uint8_t i;
+
+static void
+cmd_run(int fd)
+{
+    int cmp;
+    char *p = buf;
+    size_t len;
+    int valid_cmd = 1;
+
+    switch (buf[0]) {
+    case 'e':
+        len = strlen(CMD_ECHO);
+        if (memcmp(buf, CMD_ECHO, len) == 0) {
+            p += len + 1;
+            prcons(fd, "\n");
+            prcons(fd, p);
+            break;
+        }
+
+        valid_cmd = 0;
+        break;
+    default:
+        valid_cmd = 0;
+        break;
+    }
+
+    if (!valid_cmd) {
+        prcons(fd, "\nunrecognized command\n");
+    }
+}
+
+int
+main(int argc, char **argv)
+{
+    int fd;
+    uint16_t input;
+    char c;
+
+    if ((fd = open("/dev/console", O_RDWR)) < 0) {
+        return fd;
+    }
+
+    i = 0;
+    prcons(fd, WELCOME);
+    prcons(fd, "[root::osmora]~ ");
+    for (;;) {
+        if (read(fd, &input, 2) <= 0) {
+            continue;
+        }
+
+        c = input & 0xFF;
+        if (!is_ascii(c)) {
+            continue;
+        }
+
+        if (i < sizeof(buf)) {
+            buf[i++] = c;
+            buf[i] = 0;
+        }
+        if (c == '\n') {
+            cmd_run(fd);
+            i = 0;
+            buf[i] = 0;
+            prcons(fd, "[root::osmora]~ ");
+        } else {
+            write(fd, &c, 1);
+        }
+    }
+    return 0;
+}
-- 
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