Changed kernel magic combo prefix to Ctrl-Alt-...

[tpg/acess2.git] / Kernel / lib.c

diff --git a/Kernel/lib.c b/Kernel/lib.c
index c8a0e9f..35805b5 100644 (file)
--- a/Kernel/lib.c
+++ b/Kernel/lib.c
@@ -5,6 +5,9 @@
 #include <common.h>
 
 // === CONSTANTS ===
+#define        RANDOM_SEED     0xACE55052
+#define        RANDOM_A        0x12231ADE
+#define        RANDOM_C        0x1BADBEEF
 //                          Jan Feb Mar Apr May  Jun  Jul  Aug  Sept Oct  Nov  Dec
 const short DAYS_BEFORE[] = {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334};
 #define UNIX_TO_2K     ((30*365*3600*24) + (7*3600*24))        //Normal years + leap years
@@ -139,6 +142,18 @@ int strncmp(char *Str1, char *Str2, size_t num)
        return *Str1-*Str2;
 }
 
+/**
+ * \fn char *strdup(char *str)
+ * \brief Duplicates a string
+ */
+char *strdup(char *str)
+{
+       char    *ret;
+       ret = malloc(strlen(str)+1);
+       strcpy(ret, str);
+       return ret;
+}
+
 /**
  * \fn int strpos8(char *str, Uint32 search)
  * \brief Search a string for a UTF-8 character
@@ -293,5 +308,25 @@ Sint64 timestamp(int sec, int mins, int hrs, int day, int month, int year)
        return stamp * 1000;
 }
 
+/**
+ * \fn Uint rand()
+ * \brief Pseudo random number generator
+ * \note Unknown effectiveness (made up on the spot)
+ */
+Uint rand()
+{
+       #if 0
+       static Uint     randomState = RANDOM_SEED;
+       Uint    ret = randomState;
+        int    roll = randomState & 31;
+       randomState = (randomState << roll) | (randomState >> (32-roll));
+       randomState ^= 0x9A3C5E78;
+       return ret;
+       #else
+       static Uint     randomState = RANDOM_SEED;
+       return randomState = (RANDOM_A*randomState + RANDOM_C) & 0xFFFFFFFF;
+       #endif
+}
+
 EXPORT(timestamp);
 EXPORT(ReadUTF8);