Function string2d

src/util.c:524–536

Convert a string into a double. Returns 1 if the string could be parsed * into a (non-overflowing) double, 0 otherwise. The value will be set to * the parsed value when appropriate. * * Note that this function demands that the string strictly represents * a double: no spaces or other characters before or after the string * representing the number are accepted. */

 * a double: no spaces or other characters before or after the string
 * representing the number are accepted. */
int string2d(const char *s, size_t slen, double *dp) {
    errno = 0;
    char *eptr;
    *dp = strtod(s, &eptr);
    if (slen == 0 ||
        isspace(((const char*)s)[0]) ||
        (size_t)(eptr-(char*)s) != slen ||
        (errno == ERANGE &&
            (*dp == HUGE_VAL || *dp == -HUGE_VAL || *dp == 0)) ||
        isnan(*dp))
        return 0;
    return 1;
}

/* Convert a double to a string representation. Returns the number of bytes
 * required. The representation should always be parsable by strtod(3).