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ATOLL(3) Library Functions Manual ATOLL(3)

atoll
convert ASCII string to long long integer

#include <stdlib.h>
long long
atoll(const char *nptr);

The atoll() function converts the initial portion of the string pointed to by nptr to long long integer representation.
It is equivalent to:
strtoll(nptr, (char **)NULL, 10);

atof(3), atoi(3), atol(3), strtod(3), strtol(3), strtoul(3)

The atoll() function conforms to ISO/IEC 9899:1999 (“ISO C99”).
September 10, 2015 OpenBSD-current