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tm1637: example: avoid buffer overflow and possible NULL derefs

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defects 398, 399

Signed-off-by: Jon Trulson <jtrulson@ics.com>
Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>
This commit is contained in:
Jon Trulson 2015-06-10 16:18:24 -06:00 committed by Mihai Tudor Panu
parent 6e2587576d
commit a1dac4228a
1 changed files with 4 additions and 2 deletions
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6
examples/c++/tm1637.cxx
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@ -47,7 +47,7 @@ main(int argc, char** argv)
int timezone = -7; // Your UTC offset int timezone = -7; // Your UTC offset
time_t rawtime; time_t rawtime;
struct tm * gmt; struct tm * gmt;
char myTime[4]; char myTime[5];
fprintf(stdout, "TM1637 Display Example\n"); fprintf(stdout, "TM1637 Display Example\n");
signal(SIGINT, sig_handler); signal(SIGINT, sig_handler);
@ -62,8 +62,10 @@ main(int argc, char** argv)
time(&rawtime); // Update raw time time(&rawtime); // Update raw time
gmt = gmtime(&rawtime); // Get current time gmt = gmtime(&rawtime); // Get current time
int hour = (gmt) ? gmt->tm_hour : 0;
int min = (gmt) ? gmt->tm_min : 0;
// Format and store the time in 24 hour format // Format and store the time in 24 hour format
sprintf(myTime, "%2d%02d", (gmt->tm_hour + timezone + 24) % 24, gmt->tm_min); snprintf(myTime, 5, "%2d%02d", (hour + timezone + 24) % 24, min);
myDisplay.write(myTime); // Write to display as string myDisplay.write(myTime); // Write to display as string
myDisplay.setColon(point ^= true); // Toggle the dots on the display myDisplay.setColon(point ^= true); // Toggle the dots on the display