#ifndef FLIB_UTIL_H_

#define FLIB_UTIL_H_

#include <stddef.h>

#include <stdarg.h>

#include <stdbool.h>

/**

 * Prints a format string to a newly allocated buffer of the required size.

 * Parameters are like those for printf. Returns NULL on error.

 *

 * Returned buffer must be free()d

 */

char *flib_asprintf(const char *fmt, ...);

/**

 * Exactly as flib_asprintf, but accepts a va_list.

 */

char *flib_vasprintf(const char *fmt, va_list args);

/**

 * Return a duplicate of the provided string, or NULL if an error

 * occurs or if str is already NULL.

 *

 * Returned buffer must be free()d

 */

char *flib_strdupnull(const char *str);

/**

 * Return a duplicate of the provided buffer, or NULL if an error

 * occurs or if buf is already NULL or if size is 0.

 *

 * Returned buffer must be free()d

 */

void *flib_bufdupnull(const void *buf, size_t size);

/**

 * Simple malloc wrapper that automatically logs an error if no memory

 * is available. Otherwise behaves exactly like malloc.

 */

void *flib_malloc(size_t size);

/**

 * Simple calloc wrapper that automatically logs an error if no memory

 * is available. Otherwise behaves exactly like calloc.

 */

void *flib_calloc(size_t count, size_t elementsize);

/**

 * Simple realloc wrapper that automatically logs an error if no memory

 * is available. Otherwise behaves exactly like realloc.

 */

void *flib_realloc(void *ptr, size_t size);

/**

 * Replace all non-alphanumeric and non-ascii bytes with escape

 * sequences in the form %XX. Does not modify the original string,

 * but returns a newly allocated one that must be free()d. Returns

 * null on failure or if null was passed as argument.

 *

 * This should work fine with all ASCII-based charsets including UTF-8.

 */

char *flib_urlencode(const char *str);

/**

 * Replace some bytes with escape sequences in the form %XX.

 * Does not modify the original string, but returns a newly allocated

 * one that must be free()d.

 *

 * All bytes for which the predicate function returns true are escaped.

 *

 * Returns null on failure or if null was passed as argument.

 */

char *flib_urlencode_pred(const char *str, bool (*needsEscaping)(char c));

/**

 * Replace escape sequences of the form %XX with their byte values.

 * Does not modify the original string, but returns a newly allocated

 * one that must be free()d. Returns null on failure or if null was

 * passed as argument.

 */

char *flib_urldecode(const char *str);

#endif