uint8_t MD_PZone::findChar(uint8_t code, uint8_t size, uint8_t *cBuf)
// Find a character either in user defined list or from foint table
{
charDef *pcd = _userChars;
uint8_t len;
PRINTX("\nfindUserChar 0x", code);
while (pcd != NULL)
{
PRINTX(" ", pcd->code);
if (pcd->code == code) // found it
{
PRINTS(" found character");
len = min(size, pcd->data[0]);
memcpy(cBuf, &pcd->data[1], len);
return(len);
}
pcd = pcd->next;
}
PRINTS(" no user char");
_MX->setFont(_fontDef); // change to the font for this zone
len = _MX->getChar(code, size, cBuf);
return(len);
}
void renameSymbol() {
int i,k;
// rename local variable 'i'
for(i=0; i<10; i++) printf(" %d", i);
printf("\n");
// rename the 'renameSymbol' function
if (0) renameSymbol();
#define PRINTJ() printf("j == %d\n", j)
// works inside macros, rename for example 'j'
j = 33; PRINTJ();
// you can rename any kind of symbol, a macro parameter for example
#define PRINT(renameMe) printf("%d\n", renameMe)
// renaming 'k' to 'x' will cause name collision
k = 0;
{
int x; x = k; printf("x==%d\n", x);
}
#define PRINTX() printf("x == %d\n", x);
// problem can occur also if a symbol inside a macro is refering
// to various different variables. Rename for example following
// 'x' variable
{
int x = 0;
PRINTX();
}
}
bool MD_PZone::addChar(uint8_t code, uint8_t *data)
// Add a user defined character to the replacement list
{
charDef *pcd;
if (code == 0)
return(false);
PRINTX("\naddChar 0x", code);
// first see if we have the code in our list
pcd = _userChars;
while (pcd != NULL)
{
if (pcd->code == code)
{
pcd->data = data;
PRINTS(" found existing in list");
return(true);
}
pcd = pcd->next;
}
// Now see if we have an empty slot in our list
pcd = _userChars;
while (pcd != NULL)
{
if (pcd->code == 0)
{
pcd->code = code;
pcd->data = data;
PRINTS(" found empty slot");
return(true);
}
pcd = pcd->next;
}
// default is to add a new node to the front of the list
if ((pcd = new charDef) != NULL)
{
pcd->code = code;
pcd->data = data;
pcd->next = _userChars;
_userChars = pcd;
PRINTS(" added new node");
}
else
{
PRINTS(" failed allocating new node");
}
return(pcd != NULL);
}
uint8_t MD_PZone::makeChar(char c)
// Load a character bitmap and add in trailing char spacing blanks
{
uint8_t len;
PRINTX("\nmakeChar 0x", c);
// look for the character
len = findChar((uint8_t)c, ARRAY_SIZE(_cBuf), _cBuf);
// Add in the inter char spacing
for (uint8_t i = 0; i<_charSpacing; i++)
{
if (len < ARRAY_SIZE(_cBuf))
_cBuf[len++] = 0;
}
PRINT(", len=", len);
return(len);
}
int main() {
int x = 1;
renameSymbol();
PRINTX();
}