#ifndef __UTIL_H__
#define __UTIL_H__

#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#if defined(_WIN32) || defined(WIN32)
#include <windows.h> /* SSIZE_T */
typedef SSIZE_T ssize_t;
#else
#include <unistd.h> /* ssize_t */
#endif

typedef uint8_t pseudo_void;

/* some ANSI color codes */
#define C_RED     "\x1b[31m"
#define C_GREEN   "\x1b[32m"
#define C_YELLOW  "\x1b[33m"
#define C_BLUE    "\x1b[34m"
#define C_MAGENTA "\x1b[35m"
#define C_CYAN    "\x1b[36m"
#define C_WHITE   "\x1b[37m"

#define C_IRED     "\x1b[31;1m"
#define C_IGREEN   "\x1b[32;1m"
#define C_IYELLOW  "\x1b[33;1m"
#define C_IBLUE    "\x1b[34;1m"
#define C_IMAGENTA "\x1b[35;1m"
#define C_IWHITE   "\x1b[37;1m"
#define C_ICYAN    "\x1b[36;1m"

#define C_RESET   "\x1b[m"

void sleep_secs(double secs);

#define ERRSZ 4096
extern char errbuf[ERRSZ];
extern bool err;
extern size_t err_ln, err_col;
#define TRY(expr) {expr; if (err) return;}
#define TRY_ELSE(expr, onerr) {expr; if (err) {onerr; return;}}
#define TRY_RET(expr, ret) {expr; if (err) return (ret);}
#define TRY_RET_ELSE(expr, ret, onerr) {expr; if (err) {onerr; return (ret);}}
void set_err(const char *fmt, ...);

#define ASSERT_UNREACHED() { fprintf(stderr, "Illegal code position reached in %s:%d\n", __FILE__, __LINE__); abort(); }

#define IS_NUM(c)   (c >= '0' && c <= '9')
#define IS_ALPHA(c) ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || c == '_')
#define IS_ALNUM(c) (IS_ALPHA(c) || IS_NUM(c))

void *xmalloc(size_t size);
void *xrealloc(void *ptr, size_t size);

/* Useful for efficiently allocating lots of data that can all be freed at once afterwards. */
typedef struct Pool {
	struct Pool *next;
	void *data;
	size_t len, cap;
} Pool;
Pool *pool_new(size_t init_cap); /* You usually want init_cap to be pretty high. */
void pool_term(Pool *p);
void *pool_alloc(Pool *p, size_t bytes);

#define streq(a, b) (strcmp(a, b) == 0)
/* check if a null-terminated string and a non-null-terminated string are equal */
static inline bool streq_0_n(const char *a, const char *b, size_t bn) { return bn == strlen(a) ? strncmp(a, b, bn) == 0 : false; }
/* a more trusting version of strndup */
char *sndup(const char *s, size_t n);
/* sndup with memory pools */
char *psndup(Pool *p, const char *s, size_t n);
/* convert a non-null-terminated string to an intmax_t */
intmax_t stoimax(const char *s, size_t n, size_t base, ssize_t *endpos /* -1 on success */);
/* convert a non-null-terminated string to a double */
double stod(const char *s, size_t n, ssize_t *endpos /* -1 on success */);
/* return the escape sequence for a given character; return NULL if there is none */
const char *unescape_char(char c);

/* sets errno on failure */
char *mreadfile(FILE *fp);

uint32_t fnv1a32(const void *data, size_t n);

#endif /* UTIL_H */