From ea8882dd7c024db436e25e86ac3d3fa3b3e43aa0 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Sun, 21 Dec 2025 17:14:52 -0500
Subject: usr: sdk: Add initial string lib sources + strlen

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 mk/defaults.mk                 |  1 +
 usr/.keep                      |  0
 usr/sdk/Makefile               | 21 +++++++++++++++++++++
 usr/sdk/common/string/strlen.c | 20 ++++++++++++++++++++
 usr/sdk/inc/sdk/string.h       | 18 ++++++++++++++++++
 5 files changed, 60 insertions(+)
 delete mode 100644 usr/.keep
 create mode 100644 usr/sdk/Makefile
 create mode 100644 usr/sdk/common/string/strlen.c
 create mode 100644 usr/sdk/inc/sdk/string.h

diff --git a/mk/defaults.mk b/mk/defaults.mk
index ae85cfd..2c06603 100644
--- a/mk/defaults.mk
+++ b/mk/defaults.mk
@@ -8,6 +8,7 @@ QEMU = qemu-system-$(ARCH)
 
 CC = $(shell pwd)/var/cc/gcc/bin/$(ARCH)-pc-osmora-gcc
 LD = $(shell pwd)/var/cc/toolchain/build-binutils/bin/$(ARCH)-pc-osmora-ld
+AR = $(shell pwd)/var/cc/toolchain/build-binutils/bin/$(ARCH)-pc-osmora-ar
 
 SYS_CFLAGS =			\
 	-nostdlib			\
diff --git a/usr/.keep b/usr/.keep
deleted file mode 100644
index e69de29..0000000
diff --git a/usr/sdk/Makefile b/usr/sdk/Makefile
new file mode 100644
index 0000000..9a5cc73
--- /dev/null
+++ b/usr/sdk/Makefile
@@ -0,0 +1,21 @@
+#
+# Copyright (c) 2025, Ian Moffett.
+# Provided under the BSD-3 clause.
+#
+
+CFILES = $(shell find common/ -name "*.c")
+OFILES = $(CFILES:.c=.o)
+
+CC =
+LD =
+
+ARCH =
+SYS_CFLAGS =
+CFLAGS = $(SYS_CFLAGS) -Iinc/
+
+.PHONY: all
+all: $(OFILES)
+	$(AR) rcs libmos.a $(OFILES)
+
+%.o: %.c
+	$(CC) -c $(CFLAGS) $< -o $@
diff --git a/usr/sdk/common/string/strlen.c b/usr/sdk/common/string/strlen.c
new file mode 100644
index 0000000..4499512
--- /dev/null
+++ b/usr/sdk/common/string/strlen.c
@@ -0,0 +1,20 @@
+/*
+ * Copyright (c) 2025, Ian Moffett.
+ * Provided under the BSD-3 clause.
+ */
+
+#include <sdk/string.h>
+#include <sdk/types.h>
+
+USIZE
+strlen(const char *str)
+{
+    USIZE len = 0;
+
+    if (str == NULL) {
+        return 0;
+    }
+
+    while (str[len++] != '\0');
+    return len - 1;
+}
diff --git a/usr/sdk/inc/sdk/string.h b/usr/sdk/inc/sdk/string.h
new file mode 100644
index 0000000..f7668fd
--- /dev/null
+++ b/usr/sdk/inc/sdk/string.h
@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2025, Ian Moffett.
+ * Provided under the BSD-3 clause.
+ */
+
+#ifndef _SDK_STRING_H_
+#define _SDK_STRING_H_ 1
+
+ #include <sdk/types.h>
+
+/*
+ * Returns the length of a string
+ *
+ * @str: String to get length of
+ */
+USIZE strlen(const char *str);
+
+#endif  /* !_SDK_STRING_H_ */
-- 
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