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v0.5.1
https://github.com/python/cpython
09 December 2020, 11:06:31 UTC
Revision 624af829a7d930d29f359c3d8a2408efc36b34e8 authored by Trent Mick on 19 June 2006, 23:57:41 UTC, committed by Trent Mick on 19 June 2006, 23:57:41 UTC 
[ 1295808 ] expat symbols should be namespaced in pyexpat
 
(http://python.org/sf/1295808)
1 parent f08d663
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Tip revision: 624af829a7d930d29f359c3d8a2408efc36b34e8 authored by Trent Mick on 19 June 2006, 23:57:41 UTC
[ 1295808 ] expat symbols should be namespaced in pyexpat
Tip revision: 624af82
atof.c 

/* Just in case you haven't got an atof() around...
   This one doesn't check for bad syntax or overflow,
   and is slow and inaccurate.
   But it's good enough for the occasional string literal... */

#include "pyconfig.h"

#include <ctype.h>

double atof(char *s)
{
	double a = 0.0;
	int e = 0;
	int c;
	while ((c = *s++) != '\0' && isdigit(c)) {
		a = a*10.0 + (c - '0');
	}
	if (c == '.') {
		while ((c = *s++) != '\0' && isdigit(c)) {
			a = a*10.0 + (c - '0');
			e = e-1;
		}
	}
	if (c == 'e' || c == 'E') {
		int sign = 1;
		int i = 0;
		c = *s++;
		if (c == '+')
			c = *s++;
		else if (c == '-') {
			c = *s++;
			sign = -1;
		}
		while (isdigit(c)) {
			i = i*10 + (c - '0');
			c = *s++;
		}
		e += i*sign;
	}
	while (e > 0) {
		a *= 10.0;
		e--;
	}
	while (e < 0) {
		a *= 0.1;
		e++;
	}
	return a;
}
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