#Why do I need static in this code:

14 messages · Page 1 of 1 (latest)

turbid fossil
# 
    // ...

    static char STR[64];

    for (int i = 0; i < 32; i++)
        sprintf(STR + (i << 1), "%02x", h[i]);

    return STR;```
tepid pollenBOT
#

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turbid fossil
#

i << 1 is just i * 2

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The function is to return STR. So it makes no sense to me why I need static.

runic garnet
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Because you return the buffer from this function.
See the last statement.

Without static, that buffer would be released as soon as the function returns.

#

This code is not thread safe.

turbid fossil
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How should I change the code?

runic garnet
#

It's fine as it is, but know that there are limitations.

turbid fossil
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I would like to make it thread safe.

runic garnet
#

Then you should probably make the caller pass the buffer into the function.

turbid fossil
#

Gotcha.

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Thanks.

tepid pollenBOT
#

@turbid fossil Has your question been resolved? If so, run !solved :)

turbid fossil
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!solved