Hi all:
I think I've found a bug in the version of atof that ships with the latest/last
version of Winavr.
When I pass it a string with a floating point number, the number it returns is
incorrect.
For example, I can pass it '-1033\0', and the result is something like -15640.
Similarly, I can pass it '0.33', and the result is 16000 and something. It
seems that the only thing it gets right are the sign and when the input string
is '0.00'.
I have reimplemented atof as my_atof, and it works perfectly.
Note that this incorrect behaviour is also apparent in avr-gcc shipped with
ubuntu 10.04.2.
An example of code that demonstrates the behaviour is below:
float atof_test(void){
static char buf[10];
char* pbuf = buf;
buf[0] = '-';
buf[1] = '0';
buf[2] = '.';
buf[3] = '3';
buf[4] = '3';
buf[5] = '\0';
return atof(pbuf);
}
Cheers,
--
Matt van de Werken
Electronics Engineer
Mining Geoscience, CSIRO Earth Science and Resource Engineering
1 Technology Ct Pullenvale QLD 4069
P: 07 3327 4142 F: 07 3327 4455 M: 0400 538 608
E: [email protected]
"Those that do not understand UNIX are condemned to reinvent it, poorly"
- Henry Spencer
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