va_args logging

log.c

#include <stdio.h>
#include <string.h>
#include <stdlib.h>                           
#include <errno.h>
#include <unistd.h>
#include <stdarg.h>

typedef signed    int    Int;
typedef unsigned  int    Uint;

typedef uint8_t Uint8;
typedef uint32_t Uint32;
typedef uint64_t Uint64;
typedef int32_t Int32;
typedef enum
{
    FALSE,                           /**< False value */
    TRUE                             /**< True value */
} Boolean;

#define MEMMGR_ALLOC(size) (malloc(size))
#define MEMMGR_FREE(ptr) (free(ptr))

void Log(const char *func, uint32_t line, const char *preamble, const char *msg, ...) __attribute__ ((format (printf, 4, 5)));
#define LOG_DEBUG(msg, ...) Log(__func__, __LINE__, "DEBUG", msg, ##__VA_ARGS__)
#define LOG_ERROR(msg, ...) Log(__func__, __LINE__, "ERROR", msg, ##__VA_ARGS__)
#define LOG_ABORT(msg, ...) (Log(__func__, __LINE__, "ABORT", msg, ##__VA_ARGS__), exit(-1))

void Log(const char *func, uint32_t line, const char *preamble, const char *msg, ...)
{
    char format[512];
    va_list arg;

    sprintf(format, "%s(%u) %s: %s\n", func, line, preamble, msg);

    va_start(arg, msg);
    vfprintf(stderr, format, arg);
    va_end(arg);
}