selftests/powerpc: Parse long/unsigned long value safely

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Often a file is expected to hold an integral value. Existing functions
will use a C stdlib function like atoi or strtol to parse the file.
These operations are error prone, with complicated error conditions
(atoi returns 0 if not a number, and is undefined behaviour if not in
range. strtol returns 0 if not a number, and LONG_MIN/MAX if not in
range + sets errno to ERANGE).

Signed-off-by: Benjamin Gray <bgray@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20230203003947.38033-4-bgray@linux.ibm.com

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Benjamin Gray 2023-02-03 11:39:45 +11:00 • committed by Michael Ellerman

parent 121d340be9

commit d1bc05b7bf

3 changed files with 132 additions and 7 deletions

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7

tools/testing/selftests/powerpc/include/utils.h

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6

tools/testing/selftests/powerpc/pmu/lib.c

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126

tools/testing/selftests/powerpc/utils.c

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