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Asked: 2026-06-06T00:31:19+00:00

I’ve done some research, but I didn’t find an answer to my question. I

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I’ve done some research, but I didn’t find an answer to my question. I would like to know how to determine if the used charset in a C program is ASCII. Are there any preprocessor constants ?

Many thanks.

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  1. Editorial Team

    C says:

    (C99, 5.2.1p1) “The values of the members of the execution character set are implementation-defined.”

    For example gcc says:

    The values of the members of the execution character set (C90 and C99 5.2.1).
    Determined by ABI

    http://gcc.gnu.org/onlinedocs/gcc/Characters-implementation.html

    So gcc points to the operating system documentation.

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