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v0.5.1
https://github.com/python/cpython
09 December 2020, 11:06:31 UTC
Revision b34d0ed403f5bc4d42d2333a0ba462791772d877 authored by Jack Jansen on 01 March 2001, 23:17:43 UTC, committed by Jack Jansen on 01 March 2001, 23:17:43 UTC 
Removed some stuff that shouldn't be in the dev distribution.
1 parent 1b45c73
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Tip revision: b34d0ed403f5bc4d42d2333a0ba462791772d877 authored by Jack Jansen on 01 March 2001, 23:17:43 UTC
Removed some stuff that shouldn't be in the dev distribution.
Tip revision: b34d0ed
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 "config.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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