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#include <u.h>
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#include <libc.h>
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long
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atol(char *s)
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{
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	long n;
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	int f, c;
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	n = 0;
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	f = 0;
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	while(*s == ' ' || *s == '\t')
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		s++;
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	if(*s == '-' || *s == '+') {
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		if(*s++ == '-')
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			f = 1;
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		while(*s == ' ' || *s == '\t')
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			s++;
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	}
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	if(s[0]=='0' && s[1]) {
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		if(s[1]=='x' || s[1]=='X'){
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			s += 2;
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			for(;;) {
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				c = *s;
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				if(c >= '0' && c <= '9')
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					n = n*16 + c - '0';
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				else
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				if(c >= 'a' && c <= 'f')
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					n = n*16 + c - 'a' + 10;
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				else
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				if(c >= 'A' && c <= 'F')
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					n = n*16 + c - 'A' + 10;
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				else
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					break;
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				s++;
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			}
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		} else
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			while(*s >= '0' && *s <= '7')
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				n = n*8 + *s++ - '0';
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	} else
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		while(*s >= '0' && *s <= '9')
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			n = n*10 + *s++ - '0';
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	if(f)
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		n = -n;
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	return n;
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}
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int
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atoi(char *s)
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{
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	return atol(s);
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}