cartreader/Cart_Reader/snes_clk.cpp
2021-04-28 00:44:11 -07:00

47 lines
979 B
C++

#include "snes_clk.h"
#include "SdFat.h"
#include "atoi32.h"
int32_t readClockOffset() {
FsFile clock_file;
unsigned char* clock_buf;
int16_t i;
int32_t clock_offset;
if (!clock_file.open("/snes_clk.txt", FILE_READ)) {
return INT32_MIN;
}
clock_buf = malloc(12 * sizeof(char));
i = clock_file.read(clock_buf, 11);
clock_file.close();
if (i == -1) {
free(clock_buf);
return INT32_MIN;
} else if ((i == 11) && (clock_buf[0] != '-')) {
free(clock_buf);
return INT32_MIN;
} else {
clock_buf[i] = 0;
}
for (i = 0; i < 12; i++) {
if (clock_buf[i] != '-' && clock_buf[i] < '0' && clock_buf[i] > '9') {
if (i == 0) {
free(clock_buf);
return INT32_MIN;
} else if ((i == 1) && (clock_buf[0] == '-')) {
free(clock_buf);
return INT32_MIN;
} else {
clock_buf[i] = 0;
}
}
}
clock_offset = atoi32_signed(clock_buf);
free(clock_buf);
return clock_offset;
}