1 files changed, 66 insertions, 0 deletions
diff --git a/src/lib/libc/unistd.c b/src/lib/libc/unistd.c
new file mode 100644
index 0000000..5ae1735
--- /dev/null
+++ b/src/lib/libc/unistd.c
@@ -0,0 +1,66 @@
+#include <string.h>
+#include <unistd.h>
+
+#include <kogata/syscall.h>
+
+
+char cwd_buf[256];
+
+char* getcwd(char* buf, size_t buf_len) {
+	if (buf_len > strlen(cwd_buf)) {
+		strcpy(buf, cwd_buf);
+		return buf;
+	} else {
+		return 0;
+	}
+}
+
+int chdir(const char* path) {
+	char cwd_buf2[256];
+	strcpy(cwd_buf2, cwd_buf);
+
+	if (!pathncat(cwd_buf2, path, 256)) return -1;
+
+	stat_t st;
+	if (!stat(cwd_buf2, &st)) return -1;
+	if (!(st.type & FT_DIR)) return -1;
+
+	strcpy(cwd_buf, cwd_buf2);
+	return 0;
+}
+
+char* pathncat(char* buf, const char* add, size_t buf_len) {
+	if (strchr(add, ':')) {
+		if (strlen(add) < buf_len) {
+			strcpy(buf, add);
+			return buf;
+		} else {
+			return 0;
+		}
+	} else {
+		char* sep_init = strchr(buf, ':');
+		if (add[0] == '/') {
+			if (strlen(add) + (sep_init + 1 - buf) < buf_len) {
+				strcpy(sep_init + 1, add);
+				return buf;
+			} else {
+				return 0;
+			}
+		} else {
+			//TODO: simplify '..'
+			char* end = buf + strlen(buf) - 1;
+			if (*end != '/') end++;
+			if (end + 1 - buf + strlen(add) < buf_len) {
+				*end = '/';
+				strcpy(end + 1, add);
+				return buf;
+			} else {
+				return 0;
+			}
+		}
+		return 0;
+	}
+}
+
+
+/* vim: set ts=4 sw=4 tw=0 noet :*/