initgraph, whole lot of refactor

boot/cmdline.c

@@ -1,8 +1,8 @@
 #include <zinnia/cmdline.h>
 #include <zinnia/init.h>
-#include <stddef.h>
 #include <zinnia/stdlib.h>
-#include <zinnia/string.h>
+#include <stddef.h>
+#include <string.h>
 
 // Defined in linker script.
 extern const struct cmdline_option* __ld_cmdline_start[];
@@ -10,17 +10,16 @@ extern const struct cmdline_option* __ld_cmdline_end[];
 
 static char cmdline_buf[0x1000];
 
-[[__init]]
-void cmdline_parse(const char* cmdline) {
-    if (cmdline == nullptr)
-        cmdline = "";
-
-    const size_t len = strnlen(cmdline, sizeof(cmdline_buf) - 1);
+void cmdline_parse_buf(
+    char* cmdline_buf,
+    size_t len,
+    const struct cmdline_option* const* start,
+    const struct cmdline_option* const* end
+) {
     size_t idx = 0;
-    memcpy(cmdline_buf, cmdline, len);
 
     while (1) {
-        const struct cmdline_option** opt = __ld_cmdline_start;
+        const struct cmdline_option* const* opt = start;
         char* name = nullptr;
         char* value = nullptr;
 
@@ -62,7 +61,7 @@ void cmdline_parse(const char* cmdline) {
         }
 
         // Find the corresponding option.
-        while (opt < __ld_cmdline_end) {
+        while (opt < end) {
             const struct cmdline_option* current = *opt;
             if (!strcmp(current->name, name)) {
                 if (value == nullptr)
@@ -105,3 +104,13 @@ void cmdline_parse(const char* cmdline) {
             break;
     }
 }
+
+[[__init]]
+void cmdline_parse(const char* cmdline) {
+    if (cmdline == nullptr)
+        cmdline = "";
+
+    const size_t len = strnlen(cmdline, sizeof(cmdline_buf) - 1);
+    memcpy(cmdline_buf, cmdline, len);
+    cmdline_parse_buf(cmdline_buf, len, __ld_cmdline_start, __ld_cmdline_end);
+}