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misc: fix and simplify string procesing bug

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previously this could create wildly inaccurate results for numbers with
a larger number of fractional digits. Combined with inaccuracy of representing
some numbers this could result in a roundtrip str -> double -> str ending
up with complete garbage.
This commit is contained in:
Adam Sutton 2013-06-23 13:34:01 +01:00
parent c2bc0a6a75
commit 2327b87304
1 changed files with 14 additions and 13 deletions
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27
src/misc/dbl.c
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@ -31,31 +31,32 @@
double
my_str2double(const char *str, const char **endp)
{
double ret = 1.0f;
int n = 0, m = 0, o = 0, e = 0;
double ret = 0.0, t = 0.1;
int n = 0, e = 0;
/* Negative */
if(*str == '-') {
ret = -1.0f;
n = 1;
str++;
}
/* Integer */
while(*str >= '0' && *str <= '9')
n = n * 10 + *str++ - '0';
if(*str != '.') {
ret *= n;
} else {
ret = ret * 10 + *str++ - '0';
/* Fracton */
if(*str == '.') {
str++;
while(*str >= '0' && *str <= '9') {
o = o * 10 + *str++ - '0';
m--;
ret += (*str++ - '0') * t;
t /= 10;
}
ret *= (n + pow(10, m) * o);
}
/* Negate */
if (n) ret *= -1;
/* Exponential */
if(*str == 'e' || *str == 'E') {
int esign = 1;
str++;