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Update libc_replacements.c - fix exp notation in strtod #77

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Update libc_replacements.c - fix exp notation in strtod #77

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8386119
Update libc_replacements.c
Jan 2, 2017
9d06e86
Update libc_replacements.c
Jan 3, 2017
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52 changes: 42 additions & 10 deletions cores/oak/libc_replacements.c
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Original file line number Diff line number Diff line change
Expand Up @@ -225,6 +225,9 @@ char* strdup(const char *str) {
double strtod(const char* str, char** endptr) {
double result = 0.0;
double factor = 1.0;
bool exp_factor = 1; //default 1 - positive exponent. Use 0 for negative
double exponent = 0;
double multiplier = 1; //multiplier for exponent
bool decimals = false;
char c;

Expand Down Expand Up @@ -252,22 +255,51 @@ double strtod(const char* str, char** endptr) {
continue;
}

int d = c - '0';
if(d < 0 || d > 9) {
break;
if (c == 'e' || c == 'E') {
str++;
if(*str == '-') {
exp_factor = 0;
str++;
} else if(*str == '+') {
str++;
}
while (c = *str) { //this while loop for the exponent
int d = c - '0';
if (d < 0 || d > 9) {
break;
}
exponent = exponent * 10 + d;
str++;
}
}

result = 10.0 * result + d;
if(decimals) {
factor *= 0.1;

else {
int d = c - '0';
if(d < 0 || d > 9) {
break;
}

result = 10.0 * result + d;
if(decimals) {
factor *= 0.1;
}

str++;
}

str++;
}
if (endptr) *endptr = (char*) str;
return result * factor;
result *= factor;

if (exponent) {
multiplier = pow(10, exponent);
if (exp_factor) result *= multiplier;
else result /= multiplier;
}

return result;
}


// ##########################################################################
// ctype functions
// ##########################################################################
Expand Down