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/* lib.c
* tag: simple function library
*
* Copyright (C) 2003 Stefan Reinauer
*
* See the file "COPYING" for further information about
* the copyright and warranty status of this work.
*/
#include <stdarg.h>
#include <string.h>
#include "types.h"
int putchar(int c);
/* ****************************************************************** */
/* Convert the integer D to a string and save the string in BUF. If
* BASE is equal to 'd', interpret that D is decimal, and if BASE is
* equal to 'x', interpret that D is hexadecimal.
*/
static void itoa(char *buf, int base, int d)
{
char *p = buf;
char *p1, *p2;
unsigned long ud = d;
int divisor = 10;
/* If %d is specified and D is minus, put `-' in the head. */
if (base == 'd' && d < 0) {
*p++ = '-';
buf++;
ud = -d;
} else if (base == 'x')
divisor = 16;
/* Divide UD by DIVISOR until UD == 0. */
do {
int remainder = ud % divisor;
*p++ =
(remainder <
10) ? remainder + '0' : remainder + 'a' - 10;
}
while (ud /= divisor);
/* Terminate BUF. */
*p = 0;
/* Reverse BUF. */
p1 = buf;
p2 = p - 1;
while (p1 < p2) {
char tmp = *p1;
*p1 = *p2;
*p2 = tmp;
p1++;
p2--;
}
}
/* Format a string and print it on the screen, just like the libc
* function printf.
*/
void printk(const char *format, ...)
{
va_list ap;
int c, d;
char buf[20];
va_start(ap, format);
while ((c = *format++) != 0) {
char *p;
if (c != '%') {
putchar(c);
continue;
}
c = *format++;
switch (c) {
case 'd':
case 'u':
case 'x':
d = va_arg(ap, int);
itoa(buf, c, d);
p = buf;
goto string;
break;
case 's':
p = va_arg(ap, char *);
if (!p)
p = "(null)";
string:
while (*p)
putchar(*p++);
break;
default:
putchar(va_arg(ap, int));
break;
}
}
va_end(ap);
}
/* memset might be a macro or alike. Disable it to be sure */
#undef memset
void *memset(void *s, int c, size_t count)
{
char *xs = (char *) s;
while (count--)
*xs++ = c;
return s;
}
void *memmove(void *dest, const void *src, size_t count)
{
char *tmp, *s;
if (dest <= src) {
tmp = (char *) dest;
s = (char *) src;
while (count--)
*tmp++ = *s++;
} else {
tmp = (char *) dest + count;
s = (char *) src + count;
while (count--)
*--tmp = *--s;
}
return dest;
}
#ifdef DEBUG_GDB
void *memcpy(void *dest, const void *src, size_t count)
{
char *tmp = (char *) dest, *s = (char *) src;
while (count--)
*tmp++ = *s++;
return dest;
}
#undef strncmp
int strncmp(const char *cs, const char *ct, size_t count)
{
register signed char __res = 0;
while (count) {
if ((__res = *cs - *ct++) != 0 || !*cs++)
break;
count--;
}
return __res;
}
size_t strlen(const char *s)
{
const char *sc;
for (sc = s; *sc != '\0'; ++sc)
/* nothing */ ;
return sc - s;
}
#endif
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