Thread: report messages

Hello,

C99
gcc 4.4.3

I want to report some error messages to the user of my program. I have found that using Variadic function is the most scalable method to use, but I am not sure how to put it together, this is what I have so far.

Many thanks for any suggestions,

Code:

typedef enum
{
   DEV_FAILED, /* Device failed to open */
   EX_FAILED,   /* Cannot open library */
   HOST_INFO_ERR, /* Cannot get host information */
} report_msg;

Code:

#include <stdarg.h>
void report_error(FILE *out, const char *fmt, ...)
{
    va_list ap;
    va_start(ap_fmt);
    vfprintf(out, fmt, ap);
    va_end(ap);
}

Code:

my_error(stderr,
    "%s: Invalid range of %ld near line %d", __func__, range, __LINE__);