NRF9160 zephyr os cannot use the sscanf

[Giannis Anastasopoulos]

Dear All,

I am trying to use sscanf in a project and I am getting the message that it is undefined. I am including <stdio.h>.

I cannot understand/find the reason of the problem. The most similar question to mine I could find was this and it didn't address the sscanf isse

[Håkon Alseth]

Hi,

 

The default libc is the zephyr minimal libc, which does not include a implementation of sscanf. Could you try adding CONFIG_NEWLIB_LIBC=y to your prj.conf and recompile?

 

Kind regards,

Håkon

[zsn]

I know this is too old ticket but,  I cant use sscanf for float numbers, even though I enabled

CONFIG_NEWLIB_LIBC_FLOAT_PRINTF=y

CONFIG_NEWLIB_LIBC_NANO=y

 

but sscanf works ok for the Not a floating-point number

char input[] = "23.98";
 float vald = 0;
 int num_parsed = sscanf(input, "%f", &vald);

printk("Input: %s\n", input);
 printk("Parsed values: %f\n", (double)vald);
printk("Number of values parsed: %d\n", num_parsed);



return: 

Input: 23.98
Parsed values: 0.000000
Number of values parsed: 0

[zsn]

the solution is I needed to enable it

 

CONFIG_NEWLIB_LIBC_FLOAT_SCANF=y