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Update lambda_magic.rst (#4187)

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Add some fixes in example code to make it more robust:
- Prevent from buffer overflow
- Add check on valid character
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Anton Verburg 2024-08-22 19:34:50 +02:00 committed by GitHub
parent bc5c886714
commit 2cf3f586df
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1 changed files with 11 additions and 4 deletions
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15
cookbook/lambda_magic.rst
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@ -128,17 +128,24 @@ With this you can use automations or lambda to set switch or sensor states.
if (readch > 0) {
switch (readch) {
case '\n': // Ignore new-lines
break;
case '\r': // Return on CR
case '\n':
case '\r': // Return on CR or newline
buffer[pos] = 0; // Just to be sure, set last character 0
rpos = pos;
pos = 0; // Reset position index ready for next time
return rpos;
default:
if (pos < len-1) {
if ((pos < len-1) && ( readch < 127 )) { // Filter on <127 to make sure it is a character
buffer[pos++] = readch;
buffer[pos] = 0;
}
else
{
buffer[pos] = 0; // Just to be sure, set last character 0
rpos = pos;
pos = 0; // Reset position index ready for next time
return rpos;
}
}
}
// No end of line has been found, so return -1.