strerror_r.c File Reference

#include <assert.h>
#include <errno.h>
#include <string.h>

Include dependency graph for strerror_r.c:

Go to the source code of this file.

Functions
int	strerror_r (int err_no, char *buffer, size_t buffer_size)

Function Documentation

strerror_r()

int strerror_r	(	int	err_no,
		char *	buffer,
		size_t	buffer_size
	)

Definition at line 5 of file strerror_r.c.

{
    int r = 0;
    char* err_msg = strerror(err_no);
    size_t length = strlen(err_msg);

    assert(buffer);

    if(length >= buffer_size)
    {
        if(buffer_size)
        {
            // -1 so we don't copy an extra byte...
            memcpy(buffer, err_msg, buffer_size - 1);
            // since we will null terminate the string
            buffer[buffer_size - 1] = 0;
        }

        r = ERANGE;
    }
    else
    {
        // +1 for null termination
        memcpy(buffer, err_msg, length + 1);
    }

    return r;
}

References assert, ERANGE, memcpy(), strerror(), and strlen().