minabeoki opened a new pull request, #6139:
URL: https://github.com/apache/incubator-nuttx/pull/6139
## Summary
- Cast to unsigned char for strcmp and strncmp
- strcmp and strncmp are described following by opengroup.org
> The sign of a non-zero return value shall be determined by the sign
> of the difference between the values of the first pair of bytes
> (both interpreted as type **unsigned char**) that differ in the strings
> being compared.
https://pubs.opengroup.org/onlinepubs/9699919799/functions/strcmp.html
https://pubs.opengroup.org/onlinepubs/9699919799/functions/strncmp.html
## Impact
- strcmp and strncmp return value
## Testing
- ostest on sabre-6quad:smp w/ qemu
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