C - AtoI: Convert a string of digits into its numeric equivalent

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/*
 * AtoI: Convert a string of digits into its numeric equivalent.
 *
 * AtoI.c - by FreeMan
 */

int AtoI(char s[])
{
	int i, n;
	n = 0;
	for (i = 0; s[i] >= '0' && s[i] <= '9'; ++i)
	{
		n = 10 * n + (s[i] - '0');
	}
	return n;
}