kernel: commandline support

src/sys/cmdline.c

@@ -0,0 +1,68 @@
+#include <hashtable.h>
+#include <limine.h>
+#include <kernel/cmdline.h>
+#include <kernel/env.h>
+#include <kernel/alloc.h>
+#include <arch/panic.h>
+#include <string.h>
+#include <stdio.h>
+
+static volatile struct limine_kernel_file_request kfreq = {
+	.id = LIMINE_KERNEL_FILE_REQUEST,
+	.revision = 0
+};
+
+// takes a "EXAMPLE=EXAMPLE" pair, turns the '=' into a NULL and returns the start of the second token. returns NULL if there is no '='
+
+static char* pair(char* s){
+	size_t len = strlen(s);
+
+	for(uintmax_t i = 0; i < len; ++i){
+		if(s[i] == '='){
+			s[i] = '\0';
+			return s + i + 1;
+		}
+	}
+
+
+	return NULL;
+}
+
+void cmdline_parse(){
+	
+	char* ptr = kfreq.response->kernel_file->cmdline;
+	size_t count = *ptr == '\0' ? 0 : 1; 
+	char* it = ptr;
+
+	char** tokens = alloc(sizeof(char*));
+
+	if(tokens == NULL)
+		_panic("Out of memory!\n", NULL);
+
+	*tokens = ptr;
+
+	while(*it != '\0'){
+
+		if(*it == ' '){
+			*it = '\0';
+			++count;
+			tokens = realloc(tokens, sizeof(char*) * count);
+			if(tokens == NULL)
+				_panic("Out of memory!\n", NULL);
+			tokens[count-1] = it+1;
+		}
+
+		++it;
+	}
+
+	for(uintmax_t i = 0; i < count; ++i){
+		char* second = pair(tokens[i]);
+		if(env_set(tokens[i], second))
+			_panic("Out of memory!", NULL);
+	}
+	
+	printf("cmdline: %lu envs\n", count);
+
+	free(tokens);
+		
+}