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fix getErrorCode #58

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fix getErrorCode #58

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26 changes: 12 additions & 14 deletions platform_specific/socketcan/socketcan.c
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Original file line number Diff line number Diff line change
Expand Up @@ -19,27 +19,25 @@
#include <linux/can.h>
#include <errno.h>
#include <stdlib.h>
#include <assert.h>
#include <limits.h>
#include <stdint.h>

/// Returns the current errno as negated int16_t
static int16_t getErrorCode()
{
const int out = -abs(errno);
if (out < 0)
{
if (out >= INT16_MIN)
{
return (int16_t)out;
}
else
{
return INT16_MIN;
}
}
else
const int errno_val = errno;
if (errno_val == 0)
{
assert(false); // Requested an error when errno is zero?
return INT16_MIN;
}

if (errno_val > INT16_MAX || errno_val < INT16_MIN) {
assert(false); // Requested an error when errno is zero?
return INT16_MIN;
}
return -(int16_t)errno_val;
}

int16_t socketcanInit(SocketCANInstance* out_ins, const char* can_iface_name)
Expand Down Expand Up @@ -177,4 +175,4 @@ int16_t socketcanReceive(SocketCANInstance* ins, CanardCANFrame* out_frame, int3
int socketcanGetSocketFileDescriptor(const SocketCANInstance* ins)
{
return ins->fd;
}
}
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