linux, pcp: cast to unsigned char for ctype functions

[prownd]

Two leftovers passing a plain char to <ctype.h>, which is undefined for negative values. LinuxProcessTable_readStatusFile() is inconsistent with the three isdigit() calls surrounding it in the same loop.

[coderabbitai]

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Configuration used: Repository UI

Review profile: ASSERTIVE

Plan: Advanced

Run ID: 8be1c7e1-115e-48d5-a269-0850ad077c5a

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Reviewing files that changed from the base of the PR and between 763e498 and a6e35d3.

📒 Files selected for processing (2)

• linux/LinuxProcessTable.c
• pcp/Metric.c

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📝 Walkthrough

Walkthrough

The change updates two ctype calls. LinuxProcessTable_readStatusFile now casts the value passed to isdigit to unsigned char. Metric_lookupText now casts the first description byte before passing it to toupper. These changes address high-bit character values without changing normal parsing or formatting behavior.

Suggested reviewers: benbe

Priority: ⬇️ Low

Change: Bug fix

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_{High-bit bytes now pass with care
Ctype calls find safe values there
Digits parse without surprise
Text keeps its proper guise
Two small casts make behavior wise}

_{Comment @coderabbitai help to get the list of available commands.}