Simple logging system in C

log.c

#include <stdio.h>
#include "log.h"

void
PLog_printf(const char *type, const char *filename, unsigned int line, const char *fmt, ...) {
    va_list vl;
    va_start(vl, fmt);
    fprintf(stderr, "%s:%u: %s: ", filename, line, type);
    vfprintf(stderr, fmt, vl);
    putc('\n', stderr);
    va_end(vl);
    }

log.h

#ifndef log_h
#define log_h

#include <setjmp.h>

#define PLog_error(...) PLog_printf("error", __FILE__, __LINE__, __VA_ARGS__)
#define PLog_warn(...) PLog_printf("warning", __FILE__, __LINE__, __VA_ARGS__)
#define PLog_info(...) PLog_printf("info", __FILE__, __LINE__, __VA_ARGS__)

void PLog_printf(const char *type, const char *filename, unsigned int line, const char *fmt, ...);

/* The horror! The horror! */
#define PLog_panic(buf, ...) \
    do { \
        PLog_error(__VA_ARGS__); \
        longjmp((buf), 1); \
        } while (0)

#endif