?? atol.c
字號:
/*
* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
* See the copyright notice in the ACK home directory, in the file "Copyright".
*/
/* $Header: atol.c,v 1.3 90/05/22 10:48:12 ceriel Exp $ */
#include <ctype.h>
#include <stdlib.h>
/* We do not use strtol here for backwards compatibility in behaviour on
overflow.
*/
long
atol(register const char *nptr)
{
long total = 0;
int minus = 0;
while (isspace(*nptr)) nptr++;
if (*nptr == '+') nptr++;
else if (*nptr == '-') {
minus = 1;
nptr++;
}
while (isdigit(*nptr)) {
total *= 10;
total += (*nptr++ - '0');
}
return minus ? -total : total;
}
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