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#define LFACTOR1 10000000000ULL
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#define LFACTOR2 100000000000ULL
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1L, 10L, 100L, 1000L, 10000L, 100000L, 1000000L, 10000000L, 100000000L
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nptr in pointer to the string to be converted
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endptr in/out pointer to the end of the string/
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pointer to the stop character
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error out returned error code
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This function takes the decimal representation of integer number
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from string nptr and converts it to an signed or unsigned
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Space characters and tab are ignored.
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A sign character might precede the digit characters. The number
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may have any number of pre-zero digits.