#ifndef dbg_h
#define dbg_h

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

#ifdef NDEBUG
#define debug(M, ...)
#define DEBUG_LOC_FMT
#define DEBUG_LOC_VALS
#define DEBUG_LEVEL(X)
#else
#define debug(M, ...) fprintf(stderr, "[DEBUG] %s:%d %s: " M "\n", __FILE__, __LINE__, __func__, ##__VA_ARGS__)
#define DEBUG_LOC_FMT "%s:%d %s: "
#define DEBUG_LOC_VALS , __FILE__, __LINE__, __func__
#define DEBUG_LEVEL(X) X
#endif

#define clean_errno() (errno == 0 ? "" : ": "), (errno == 0 ? "" : strerror(errno))

#define log_err(M, ...) fprintf(stderr, DEBUG_LEVEL("[ERROR] ") DEBUG_LOC_FMT M "%s%s\n" DEBUG_LOC_VALS, ##__VA_ARGS__, clean_errno())

#define log_warn(M, ...) fprintf(stderr, DEBUG_LEVEL("[WARN]  ") DEBUG_LOC_FMT M "%s%s\n" DEBUG_LOC_VALS, ##__VA_ARGS__, clean_errno())

#define log_info(M, ...) fprintf(stderr, DEBUG_LEVEL("[INFO]  ") DEBUG_LOC_FMT M "\n" DEBUG_LOC_VALS, ##__VA_ARGS__)

#define check(A, M, ...) if(!(A)) { log_err(M, ##__VA_ARGS__); errno=0; goto error; }

#define sentinel(M, ...) { log_err(M, ##__VA_ARGS__); errno=0; goto error; }

#define check_mem(A) check((A), "out of memory")

#define check_debug(A, M, ...) if(!(A)) { debug(M, ##__VA_ARGS__); errno=0; goto error; }


#define zero(func, ...) ({ typeof(func(__VA_ARGS__)) rv = func(__VA_ARGS__); check(rv == 0, #func " failed"); rv; })
#define chk(func, ...) ({ typeof(func(__VA_ARGS__)) rv = func(__VA_ARGS__); check(rv != 0, #func " failed"); rv; })
#define nneg(func, ...) ({ typeof(func(__VA_ARGS__)) rv = func(__VA_ARGS__); check(rv >= 0, #func " failed"); rv; })


#define Malloc(size) chk(malloc, size)
#define Realloc(ptr, size) chk(realloc, ptr, size)
#define Free(ptr) free(ptr), ptr = NULL

// #define Fopen(path, mode) chk(fopen, path, mode)
#define Fopen(path, mode) ({ char *p = path; FILE *rv = fopen(p, mode); check(rv, "fopen failed: %s", p); rv; })
#define Fclose(fp) zero(fclose, fp), fp = NULL


#endif