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