implemented a few utils

inc/nox/math.h

@@ -0,0 +1,11 @@
+// This file is part of noxos and licensed under the MIT open source license
+
+#ifndef LIBNX_MATH_H
+#define LIBNX_MATH_H
+
+#include "stdtypes.h"
+
+uint64_t min(uint64_t a, uint64_t b);
+uint64_t max(uint64_t a, uint64_t b);
+
+#endif //LIBNX_MATH_H

inc/nox/memory.h

@@ -0,0 +1,12 @@
+// This file is part of noxos and licensed under the MIT open source license
+
+#ifndef LIBNX_MEMORY_H
+#define LIBNX_MEMORY_H
+
+#include "nox/stdtypes.h"
+
+void  memcpy    (void* source, void* destination, uint32_t num);
+void  memset    (void* destination, uint8_t data, uint32_t num);
+bool  memcmp    (void* a, void* b, uint32_t num);
+
+#endif //LIBNX_MEMORY_H

inc/nox/stdio.h

@@ -15,9 +15,10 @@ enum {
 
 file_t      fopen   (string_t path);
 void        fclose  (file_t file);
-uint32_t    fread   (file_t file, uint32_t offset, void* buffer, uint32_t num);
+uint64_t    fread   (file_t file, uint32_t offset, void* buffer, uint32_t num);
-uint32_t    fwrite  (file_t file, uint32_t offset, void* buffer, uint32_t num);
+uint64_t    fwrite  (file_t file, uint32_t offset, void* buffer, uint32_t num);
 
 void        printf  (string_t format);
+char        getc    ();
 
 #endif //NOX_LIBC_SYSCALL_H

inc/syscall.h

@@ -40,6 +40,6 @@ typedef enum {
     SYSCALL_KERNEL_PANIC                = 0xFF01
 } syscall_E;
 
-extern status_E syscall_perform(uint64_t id, uint64_t arg1, uint64_t arg2, uint64_t arg3, uint64_t arg4);
+extern uint64_t syscall_perform(uint64_t id, uint64_t arg1, uint64_t arg2, uint64_t arg3, uint64_t arg4);
 
 #endif //LIBC_SYSCALL_H

src/math.c

@@ -0,0 +1,11 @@
+// This file is part of noxos and licensed under the MIT open source license
+
+#include "nox/math.h"
+
+uint64_t min(uint64_t a, uint64_t b) {
+    return a < b ? a : b;
+}
+
+uint64_t max(uint64_t a, uint64_t b) {
+    return a > b ? a : b;
+}

src/memory.c

@@ -0,0 +1,64 @@
+// This file is part of noxos and licensed under the MIT open source license
+
+#include "nox/memory.h"
+
+void memcpy(void* source, void* destination, uint32_t num) {
+    uint32_t  num_64 = num / 8;
+    uint64_t* src_64 = (uint64_t*)source;
+    uint64_t* dst_64 = (uint64_t*)destination;
+
+    for (uint32_t i = 0; i < num_64; i++) {
+        dst_64[i] = src_64[i];
+    }
+
+    uint32_t num_8 = num % 8;
+    uint8_t* src_8 = &((uint8_t*)source)[num - num_8];
+    uint8_t* dst_8 = &((uint8_t*)destination)[num - num_8];
+
+    for (uint32_t i = 0; i < num_8; i++) {
+        dst_8[i] = src_8[i];
+    }
+}
+
+void memset(void* destination, uint8_t data, uint32_t num) {
+    uint32_t  num_64  = num / 8;
+    uint64_t* dst_64  = (uint64_t*)destination;
+    uint64_t  data_64 = data;
+
+    data_64 |= (data_64 << 8) | (data_64 << 16) | (data_64 << 24) | (data_64 << 32) | (data_64 << 40) | (data_64 << 48) | (data_64 << 56);
+
+    for (uint32_t i = 0; i < num_64; i++) {
+        dst_64[i] = data_64;
+    }
+
+    uint32_t num_8 = num % 8;
+    uint8_t* dst_8 = &((uint8_t*)destination)[num - num_8];
+
+    for (uint32_t i = 0; i < num_8; i++) {
+        dst_8[i] = data;
+    }
+}
+
+bool memcmp(void* a, void* b, uint32_t num) {
+    uint32_t  num_64 = num / 8;
+    uint64_t* a_64   = (uint64_t*)a;
+    uint64_t* b_64   = (uint64_t*)b;
+
+    for (uint32_t i = 0; i < num_64; i++) {
+        if (a_64[i] != b_64[i]) {
+            return false;
+        }
+    }
+
+    uint32_t num_8 = num % 8;
+    uint8_t* a_8 = &((uint8_t*)a)[num - num_8];
+    uint8_t* b_8 = &((uint8_t*)b)[num - num_8];
+
+    for (uint32_t i = 0; i < num_8; i++) {
+        if (a_8[i] != b_8[i]) {
+            return false;
+        }
+    }
+
+    return true;
+}

src/stdio.c

@@ -13,14 +13,20 @@ void fclose(file_t file) {
     syscall_perform(SYSCALL_FILES_CLOSE, file, 0, 0, 0);
 }
 
-uint32_t fread(file_t file, uint32_t offset, void* buffer, uint32_t num) {
+uint64_t fread(file_t file, uint32_t offset, void* buffer, uint32_t num) {
-    syscall_perform(SYSCALL_FILES_READ, file, offset, (uint64_t)buffer, num);
+    return syscall_perform(SYSCALL_FILES_READ, file, offset, (uint64_t)buffer, num);
 }
 
-uint32_t fwrite(file_t file, uint32_t offset, void* buffer, uint32_t num) {
+uint64_t fwrite(file_t file, uint32_t offset, void* buffer, uint32_t num) {
-    syscall_perform(SYSCALL_FILES_WRITE, file, offset, (uint64_t)buffer, num);
+    return syscall_perform(SYSCALL_FILES_WRITE, file, offset, (uint64_t)buffer, num);
 }
 
 void printf(string_t format) {
     fwrite(STDOUT, 0, (void*)format, strlen(format));
+}
+
+char getc() {
+    char chr;
+    while (fread(STDIN, 0, &chr, 1) == 0);
+    return chr;
 }