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#ifndef UTILS_H
#define UTILS_H
/* Utility functions for manipulating strings, time, and error codes. */
#include <stdio.h>
#include <stdint.h>
#include <time.h>
/* Internals of strbuild. */
void __strbuild(char *buf, int size,
const char *file, int line,
const char *fmt, ...);
/* Safely create a formatted string and write it to BUF. BUF shall be a buffer
* of size at least SIZE. BUF can be stack-allocated. If the formatting cannot
* be performed, exit(3) is called. This function is not meant to be called
* directly: the macro strbuild should be used. The code is adapted from the
* make_message function of the vsnprintf(3) manual page, section "examples". */
#define strbuild(buf, fmt, ...) \
__strbuild(buf, sizeof(buf), __FILE__, __LINE__, fmt, __VA_ARGS__)
#define strbuild_with_size(buf, size, fmt, ...) \
__strbuild(buf, size, __FILE__, __LINE__, fmt, __VA_ARGS__)
int str_has_suffix(const char *str, const char *suffix);
/* Abort if the database does not exist. */
void assert_db_exists(void);
/* Compute something that identifies the content of FILE. Algorithm by Dan
* Bernstein from http://www.cse.yorku.ca/~oz/hash.html via
* https://stackoverflow.com/a/7666577/20138083. */
uint32_t sum(const char *file);
/* Return an integer timestamp from a date string of the format YYYY-MM-DD. */
time_t time_from_str(const char *str);
#endif
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