arch/x86/lib.c

   1 /* lib.c
   2  * tag: simple function library
   3  *
   4  * Copyright (C) 2003 Stefan Reinauer
   5  *
   6  * See the file "COPYING" for further information about
   7  * the copyright and warranty status of this work.
   8  */
   9
  10 #include "config.h"
  11 #include "asm/types.h"
  12 #include <stdarg.h>
  13 #include "libc/stdlib.h"
  14 #include "libc/vsprintf.h"
  15 #include "kernel/kernel.h"
  16
  17 /* Format a string and print it on the screen, just like the libc
  18  * function printf.
  19  */
  20 int printk( const char *fmt, ... )
  21 {
  22         char *p, buf[512];
  23         va_list args;
  24         int i;
  25
  26         va_start(args, fmt);
  27         i = vsnprintf(buf, sizeof(buf), fmt, args);
  28         va_end(args);
  29
  30         for( p=buf; *p; p++ )
  31                 putchar(*p);
  32         return i;
  33 }
  34
  35 // dumb quick memory allocator until we get a decent thing here.
  36
  37 #define MEMSIZE 128*1024
  38 static char memory[MEMSIZE];
  39 static void *memptr=memory;
  40 static int memsize=MEMSIZE;
  41
  42 void *malloc(int size)
  43 {
  44         void *ret=(void *)0;
  45         if(memsize>=size) {
  46                 memsize-=size;
  47                 ret=memptr;
  48                 memptr = (void *)((unsigned long)memptr + size);
  49         }
  50         return ret;
  51 }
  52
  53 void free(void *ptr)
  54 {
  55         /* Nothing yet */
  56 }