kernel: cmdline parsing

kernel-src/include/kernel/cmdline.h

@@ -0,0 +1,7 @@
+#ifndef _CMDLINE_H
+#define _CMDLINE_H
+
+char *cmdline_get(char *);
+void cmdline_parse();
+
+#endif

kernel-src/sys/cmdline.c

@@ -0,0 +1,77 @@
+#include <kernel/cmdline.h>
+#include <kernel/alloc.h>
+#include <hashtable.h>
+#include <limine.h>
+#include <logging.h>
+
+static volatile struct limine_kernel_file_request kfreq = {
+	.id = LIMINE_KERNEL_FILE_REQUEST,
+	.revision = 0
+};
+
+static hashtable_t pairtable;
+
+char *cmdline_get(char *key) {
+	void *v;
+	return hashtable_get(&pairtable, &v, key, strlen(key)) == 0 ? v : NULL;
+}
+
+void cmdline_parse() {
+	__assert(hashtable_init(&pairtable, 16) == 0);
+	__assert(kfreq.response);
+	struct limine_file *kernelfile = kfreq.response->kernel_file;
+	__assert(kernelfile);
+	char *cmdline = kernelfile->cmdline;
+	__assert(cmdline);
+
+	size_t bufferlen = strlen(cmdline) + 1;
+	char buffer[bufferlen];
+	memset(buffer, 0, bufferlen);
+	char *cmdp = cmdline;
+	char *buffp = buffer;
+
+	bool doconvert = true;
+
+	while (*cmdp) {
+		char cmdchar = *cmdp++;
+		if (cmdchar == ' ' && doconvert)
+			*buffp++ = '\0';
+		else if (cmdchar == '"') {
+			doconvert = !doconvert;
+			--bufferlen;
+		} else
+			*buffp++ = cmdchar;
+	}
+	buffer[bufferlen] = '\0';
+
+	int i = 0;
+	while (i < bufferlen) {
+		char *iterator = &buffer[i];
+		bool pair = false;
+		while (*iterator) {
+			if (*iterator == '=') {
+				pair = true;
+				*iterator = '\0';
+			}
+			++iterator;
+		}
+
+		size_t keylen = strlen(&buffer[i]);
+		if (pair) {
+			char *valuep = &buffer[i + keylen + 1];
+			size_t valuelen = strlen(valuep);
+
+			char *value = alloc(valuelen) + 1;
+			__assert(value);
+			strcpy(value, valuep);
+			__assert(hashtable_set(&pairtable, value, &buffer[i], keylen, true) == 0);
+			i += valuelen + 1;
+		} else {
+			char *value = alloc(keylen + 1);
+			__assert(value);
+			strcpy(value, &buffer[i]);
+			__assert(hashtable_set(&pairtable, value, &buffer[i], keylen, true) == 0);
+		}
+		i += keylen + 1;
+	}
+}