syscalls: fix cwd-related stuff

include/exec_from_file.h

@@ -2,4 +2,4 @@
 #include "../include/elf.h"
 #include "../include/stdio.h"
 
-void exec_from_file(const char* filename);
+void exec_from_file(const char* filename, const char* dirname);

include/string.h

@@ -8,5 +8,7 @@ void* memcpy(void* __restrict, const void* __restrict, size_t);
 void* memmove(void*, const void*, size_t);
 void* memset(void*, int, size_t);
 size_t strlen(const char*);
+char *strcat(char *dest, const char *src);
+char *strcpy(char *dest, const char *src);
 
 #endif

src/kernel/kernel.c

@@ -218,7 +218,7 @@ void kmain(unsigned int magic, unsigned int info)
 	printf("huy1 points to: 0x%X huy2 points to:0x%X\n", huy, huy2);
 	printf("huy1: %s\nhuy2: %s", huy, huy2);
 
-	exec_from_file("/ebalo/forktest");
+	exec_from_file("/ebalo/aye", "/ebalo/");
 
 	while(1)
 	{

src/tasking/exec_from_file.c

@@ -20,7 +20,7 @@ disk_ops_t ops1 =
 
 static fat_t g_fat;
 
-int read_file(const char* path, uint8_t** buffer)
+int read_file(const char* path, uint8_t** buffer, dir_t* dir)
 {
     file_t file;
     int err = fat_fopen(&file, path, "r");
@@ -39,18 +39,21 @@ int read_file(const char* path, uint8_t** buffer)
 
     int cnt = fat_fread(&file, *buffer, file_size);
 
+    *dir = file.dir;
+    
     return fat_fclose(&file);
 }
 
-void exec_from_file(const char* filename)
+void exec_from_file(const char* filename, const char* dirname)
 {
     asm volatile("cli");
     int err, cnt;
 	err = fat_mount(&ops1, 0, &g_fat, "ebalo");
 
     uint8_t* file;
+    dir_t dir;
 
-    int result = read_file(filename, &file);
+    int result = read_file(filename, &file, &dir);
     //debug_log("result: %X\n", result);
     //debug_log("buffer: %s\n", file);
 
@@ -140,6 +143,7 @@ void exec_from_file(const char* filename)
     
     set_page_dir(curr_pd_phys);
     Process* p_task1 = task_create(elf_ehdr->e_entry, USER_STACK_TOP, 3, proc_pd);
+    *p_task1->cwd = dir;
     
     asm volatile("sti");
 }

src/tasking/syscalls.c

@@ -232,17 +232,15 @@ int sys_close(TrapFrame *tf)
 
 int sys_chdir(TrapFrame *tf)
 {
+    strcat(current->cwd->fat->path, "/");
+    strcat(current->cwd->fat->path, (char*)tf->ebx);
     return fat_opendir(current->cwd, (const char*)tf->ebx);
 }
 
 int sys_getcwd(TrapFrame *tf)
 {
-    int len = tf->ecx;
+    strcpy((char*)tf->ebx, current->cwd->fat->path);
     
-    if(len >= 260)
-        return (int)NULL;
-
-    memcpy((void*)tf->ebx, current->cwd->fat->name, current->cwd->fat->namelen);
     return tf->ebx;
 }
 

src/utils/string.c

@@ -48,3 +48,25 @@ size_t strlen(const char* str)
 		len++;
 	return len;
 }
+
+char *strcat(char *dest, const char *src) {
+    char *original_dest = dest; 
+
+    while (*dest != '\0') {
+        dest++;
+    }
+
+    while ((*dest++ = *src++) != '\0')
+        ;
+
+    return original_dest;
+}
+
+char *strcpy(char *dest, const char *src) {
+    char *original_dest = dest;
+    
+    while ((*dest++ = *src++) != '\0')
+        ;
+    
+    return original_dest;
+}