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/************************************************************************/
/* */
/* PROJECT : exFAT & FAT12/16/32 File System */
/* FILE : exfat_global.c */
/* PURPOSE : exFAT Miscellaneous Functions */
/* */
/*----------------------------------------------------------------------*/
/* NOTES */
/* */
/*----------------------------------------------------------------------*/
/* REVISION HISTORY (Ver 0.9) */
/* */
/* - 2010.11.15 [Joosun Hahn] : first writing */
/* */
/************************************************************************/
#include "exfat_config.h"
#include "exfat_global.h"
/*----------------------------------------------------------------------*/
/* Global Variable Definitions */
/*----------------------------------------------------------------------*/
/*======================================================================*/
/* */
/* LIBRARY FUNCTION DEFINITIONS -- WELL-KNOWN FUNCTIONS */
/* */
/*======================================================================*/
/*----------------------------------------------------------------------*/
/* String Manipulation Functions */
/* (defined if no system memory functions are available) */
/*----------------------------------------------------------------------*/
INT32 __wstrchr(UINT16 *str, UINT16 wchar)
{
while (*str) {
if (*(str++) == wchar) return(1);
}
return(0);
}
INT32 __wstrlen(UINT16 *str)
{
INT32 length = 0;
while (*(str++)) length++;
return(length);
}
/*======================================================================*/
/* */
/* LIBRARY FUNCTION DEFINITIONS -- OTHER UTILITY FUNCTIONS */
/* */
/*======================================================================*/
/*----------------------------------------------------------------------*/
/* Bitmap Manipulation Functions */
/*----------------------------------------------------------------------*/
#define BITMAP_LOC(v) ((v) >> 3)
#define BITMAP_SHIFT(v) ((v) & 0x07)
void Bitmap_set_all(UINT8 *bitmap, INT32 mapsize)
{
MEMSET(bitmap, 0xFF, mapsize);
} /* end of Bitmap_set_all */
void Bitmap_clear_all(UINT8 *bitmap, INT32 mapsize)
{
MEMSET(bitmap, 0x0, mapsize);
} /* end of Bitmap_clear_all */
INT32 Bitmap_test(UINT8 *bitmap, INT32 i)
{
UINT8 data;
data = bitmap[BITMAP_LOC(i)];
if ((data >> BITMAP_SHIFT(i)) & 0x01) return(1);
return(0);
} /* end of Bitmap_test */
void Bitmap_set(UINT8 *bitmap, INT32 i)
{
bitmap[BITMAP_LOC(i)] |= (0x01 << BITMAP_SHIFT(i));
} /* end of Bitmap_set */
void Bitmap_clear(UINT8 *bitmap, INT32 i)
{
bitmap[BITMAP_LOC(i)] &= ~(0x01 << BITMAP_SHIFT(i));
} /* end of Bitmap_clear */
void Bitmap_nbits_set(UINT8 *bitmap, INT32 offset, INT32 nbits)
{
INT32 i;
for (i = 0; i < nbits; i++) {
Bitmap_set(bitmap, offset+i);
}
} /* end of Bitmap_nbits_set */
void Bitmap_nbits_clear(UINT8 *bitmap, INT32 offset, INT32 nbits)
{
INT32 i;
for (i = 0; i < nbits; i++) {
Bitmap_clear(bitmap, offset+i);
}
} /* end of Bitmap_nbits_clear */
/*----------------------------------------------------------------------*/
/* Miscellaneous Library Functions */
/*----------------------------------------------------------------------*/
/* integer to ascii conversion */
void my_itoa(INT8 *buf, INT32 v)
{
INT32 mod[10];
INT32 i;
for (i = 0; i < 10; i++) {
mod[i] = (v % 10);
v = v / 10;
if (v == 0) break;
}
if (i == 10)
i--;
for (; i >= 0; i--) {
*buf = (UINT8) ('0' + mod[i]);
buf++;
}
*buf = '\0';
} /* end of my_itoa */
/* value to base 2 log conversion */
INT32 my_log2(UINT32 v)
{
UINT32 bits = 0;
while (v > 1) {
if (v & 0x01) return(-1);
v >>= 1;
bits++;
}
return(bits);
} /* end of my_log2 */
/* end of exfat_global.c */
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