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v0.5.1
https://github.com/python/cpython
09 December 2020, 11:06:31 UTC
Revision b7fea62ccaf10364047e8fc39005fafec7ad5975 authored by Gregory P. Smith on 10 June 2008, 21:23:22 UTC, committed by Gregory P. Smith on 10 June 2008, 21:23:22 UTC 
Rename bytesobject.c back to stringobject.c to keep with the PyString theme.
 
Part of reverting most of r63675 per the mailing list discussion.
1 parent 482f312
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Tip revision: b7fea62ccaf10364047e8fc39005fafec7ad5975 authored by Gregory P. Smith on 10 June 2008, 21:23:22 UTC
Rename bytesobject.c back to stringobject.c to keep with the PyString theme.
Tip revision: b7fea62
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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