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#include <stdint.h>
const uint8_t bits[8] = {
0x80,
0x40,
0x20,
0x10,
0x08,
0x04,
0x02,
0x01
};
int maxcol = 80;
int scr_str = 0;
int scr_row = 0;
int scr_col = 0;
uint8_t bitabl[16];
uint8_t bitpos(unsigned int row, uint8_t *mask) {
uint8_t bit = row & 7;
*mask = bits[bit];
return row >> 3;
}
uint8_t getbit(unsigned int row, unsigned int offset) {
uint8_t mask;
uint8_t byte = bitpos(row+offset, &mask);
return (bitabl[byte] & mask);
}
void setbit(unsigned int row) {
uint8_t mask;
uint8_t byte = bitpos(row, &mask);
bitabl[byte] |= mask;
}
void clrbit(unsigned int row) {
uint8_t mask;
uint8_t byte = bitpos(row, &mask);
bitabl[byte] &= ~mask;
}
int find_end(char *str, int start) {
int i;
for (i = start; str[i]; i++);
return i;
}
void shift_line(char *str, int cursor, int left) {
int end = find_end(str, cursor);
if (left) {
int i = end-1;
int j = end;
for (; i >= cursor; i--, j--) {
if (i < 0) {
i = 0;
str[i] = 0;
break;
}
str[j] = str[i];
str[i] = 0;
}
end = find_end(str, i+2);
if ((end/maxcol) > scr_row) {
setbit(end/maxcol);
}
} else {
int i = cursor;
int j = cursor-1;
for (; str[i]; i++, j++) {
str[j] = str[i];
str[i] = 0;
}
end = find_end(str, i);
if (((end-1) % maxcol) == 0 && ((end-1)/maxcol) > scr_row) {
clrbit(end/maxcol);
}
}
}
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