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46 lines
930 B
C
46 lines
930 B
C
# include "cc.h"
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/*
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C Compiler
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Routines common to phases C and M
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Copyright (c) 1977 by Alan Snyder
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atoi
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*/
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/**********************************************************************
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ATOI - convert string to integer
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This routine performs special hacks in case the number is --X,
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where -X is the smallest negative number. The result in
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this case will be off by one, but at least the sign and
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approximate magnitude will be right. Hopefully, whatever
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stupid user-written macro results in this condition is only
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looking for relatively small integers.
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**********************************************************************/
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int atoi (s) char s[];
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{int i, sign, c;
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if (!s) return (0);
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i = 0;
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sign = 1;
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while (*s == '-') {++s; sign = -sign;}
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while ((c = *s++)>='0' && c<='9') i = i*10 + c-'0';
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if (i<0)
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{i = -i;
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if (i<0)
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if (sign>0) return (-(i+1));
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else return (i);
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}
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return (sign*i);
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}
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