feature (kernel): implemented a set of data to string conversion functions

kernel/inc/utils/string.h

@@ -20,7 +20,15 @@
 
 typedef const char* string_t;
 
-uint32_t string_length (string_t str);
+uint32_t    string_length                   (string_t string);
-bool     string_compare(string_t a, string_t b);
+bool        string_compare                  (string_t a, string_t b);
+void        string_unsigned_dec_to_alpha    (string_t string, uint64_t value);
+void        string_dec_to_alpha             (string_t string, int64_t value);
+void        string_hex_8bit_to_alpha        (string_t string, uint8_t value);
+void        string_hex_16bit_to_alpha       (string_t string, uint16_t value);
+void        string_hex_32bit_to_alpha       (string_t string, uint32_t value);
+void        string_hex_64bit_to_alpha       (string_t string, uint64_t value);
+void        string_bin_to_alpha             (string_t string, uint8_t num_bits, uint64_t value);
+void        string_bool_to_alpha            (string_t string, bool value);
 
 #endif //NOX_STRING_H

kernel/src/kmain.c

@@ -44,13 +44,9 @@ void kmain(boot_info_T boot_info) {
     // this should cause a kernel panic
 //    int x = 1312 / 0;
 
-    void* debug;
+    char string[17];
-    debug = page_map_get_physical_address(g_kernel_page_map, (void*)0x100000000000);
+    string_hex_64bit_to_alpha(string, &kmain);
-    page_map_map_memory(g_kernel_page_map, (void*)0x100000000000, pframe_request(), PM_FLAG_READ_WRITE);
+    log(LOG_DEBUG, string);
-    debug = page_map_get_physical_address(g_kernel_page_map, (void*)0x100000000000);
-
-    memory_copy("test string", (void*)0x100000000000, 13);
-    log(LOG_DEBUG, (string_t)0x100000000000);
 
 
     CORE_HALT_FOREVER

kernel/src/utils/string.c

@@ -15,10 +15,13 @@
 
 #include "utils/string.h"
 #include "utils/memory.h"
+#include "utils/math.h"
 
-uint32_t string_length (string_t str) {
+const char g_hex_chars[16] = "0123456789ABCDEF";
+
+uint32_t string_length(string_t string) {
     uint32_t n = 0;
-    char*    c = (char*)str;
+    char*    c = (char*)string;
 
     while(*c != '\0') {
         c++;
@@ -36,3 +39,86 @@ bool string_compare(string_t a, string_t b) {
     }
     return memory_compare(a, b, a_len);
 }
+
+void string_unsigned_dec_to_alpha(string_t string, uint64_t value) {
+    char*       buffer  = (char*)string;
+    uint8_t     length  = 0;
+    uint64_t    divisor = 10;
+
+    while (value / divisor > 0) {
+        length  += 1;
+        divisor *= 10;
+    }
+
+    divisor = 10;
+    for (int i = length; i > 0; i--) {
+        buffer[i-1]  = '0' + (value / divisor % 10);
+        divisor     *= 10;
+    }
+
+    buffer[length]     = '0' + (value % 10);
+    buffer[length + 1] = '\0';
+}
+
+void string_dec_to_alpha(string_t string, int64_t value) {
+    if (value < 0) {
+        char* buffer = (char*)string;
+        buffer[0] = '-';
+        string_unsigned_dec_to_alpha(&string[1], abs(value));
+    } else {
+        string_unsigned_dec_to_alpha(&string[0], value);
+    }
+}
+
+void string_hex_8bit_to_alpha(string_t string, uint8_t value) {
+    char* buffer = (char*)string;
+
+    buffer[1]   = g_hex_chars[value & 0x0F];
+    value     >>= 4;
+    buffer[0]   = g_hex_chars[value & 0x0F];
+    buffer[2]   = '\0';
+}
+
+void string_hex_16bit_to_alpha(string_t string, uint16_t value) {
+    char* buffer = (char*)string;
+
+    for (int i = 4; i > 0; i--) {
+        buffer[i-1]   = g_hex_chars[value & 0x000F];
+        value       >>= 4;
+    }
+    buffer[4] = '\0';
+}
+
+void string_hex_32bit_to_alpha(string_t string, uint32_t value) {
+    char* buffer = (char*)string;
+
+    for (int i = 8; i > 0; i--) {
+        buffer[i-1]   = g_hex_chars[value & 0x0000000F];
+        value       >>= 4;
+    }
+    buffer[8] = '\0';
+}
+
+void string_hex_64bit_to_alpha(string_t string, uint64_t value) {
+    char* buffer = (char*)string;
+
+    for (int i = 16; i > 0; i--) {
+        buffer[i-1]   = g_hex_chars[value & 0x000000000000000F];
+        value       >>= 4;
+    }
+    buffer[16] = '\0';
+}
+
+void string_bin_to_alpha(string_t string, uint8_t num_bits, uint64_t value) {
+    char* buffer = (char*)string;
+
+    num_bits = MIN(num_bits, 64);
+    for (uint8_t i = 0; i < num_bits; i++) {
+        buffer[i] = ((value & (0x8000000000000000 >> i)) > 0) ? '1' : '0';
+    }
+    buffer[num_bits] = '\0';
+}
+
+void string_bool_to_alpha(string_t string, bool value) {
+    memory_copy(value ? "true" : "false", (void*)string, value ? 5 : 6);
+}