#include <FL/fl_ask.H>

void fl_message(const char *);

Displays a message in a pop-up box with an "OK" button, waits for the user to hit the button. The message will wrap to fit the window, or may be many lines by putting \n characters into it. Return is a shortcut for the OK button.

void fl_alert(const char *);

Same as fl_message except for the "!" symbol.

int fl_ask(const char *);

Displays a message in a pop-up box with an "Yes" and "No" button, waits for the user to hit the button. The message may be many lines by putting \n characters into it. The return value is 1 if the user hits Yes, 0 if they pick No. Return is a shortcut for Yes, Escape is a shortcut for No.

int fl_choice(const char *q,const char *b0,const char *b1,const char *b2);

Shows the message with three buttons below it marked with the strings b0, b1, and b2. Returns 0, 1, or 2 depending on which button is hit. Escape is a shortcut for button 0, and Return is a shortcut for button 1. Notice the "misordered" position of the buttons. You can hide buttons by passing NULL as their labels.

const char *fl_input(const char *label, const char *deflt = 0);

Pops up a window displaying a string, lets the user edit it, and return the new value. The cancel button returns NULL. The returned pointer is only valid until the next time fl_input() is called.

const char *fl_password(const char *label, const char *deflt = 0);

Same as fl_input() except an Fl_Secret_Input field is used.

void fl_message_font(Fl_Font fontid, uchar size);

Fl_Widget *fl_message_icon();

#include <FL/fl_file_chooser.H>

Fltk provides a "tab completion" file chooser that makes it easy to choose files from large directories. This file chooser has several unique features, the major one being that the Tab key completes filenames like it does in Emacs or tcsh, and the list always shows all possible completions.

char *fl_file_chooser(const char *message,const char *pattern,const char *fname);

Pops up the file chooser, waits for the user to pick a file or Cancel, and then returns a pointer to that filename or null if Cancel is chosen.

message is a string used to title the window.

#include <FL/filename.H>

int filename_list(const char *d, dirent ***list);

This is a portable and const-correct wrapper for the fl_scandir function. d is the name of a directory (it does not matter if it has a trailing slash or not). For each file in that directory a "dirent" structure is created. The only portable thing about a dirent is that dirent.d_name is the null-terminated file name. An array of pointers to these dirents is created and a pointer to the array is returned in *list. The number of entries is given as a return value. If there is an error reading the directory a number less than zero is returned, and errno has the reason (errno does not work on MSWindows). The files are sorted in "alphanumeric" order, where an attempt is made to put unpadded numbers in consecutive order.

// here is how to free the allocated space:
for (int i = return_value; i > 0;) free((void*)(list[--i]));
free((void*)list);

int filename_isdir(const char *f);

Returns non-zero if the file exists and is a directory.

const char *filename_name(const char *f);

Returns a pointer to the character after the last slash, or to the start of the filename if there is none.

const char *filename_ext(const char *f);

Returns a pointer to the last period in filename_name(f), or a pointer to the trailing null if none.

char *filename_setext(char *f,const char *ext);

Does strcpy(filename_ext(f),ext?ext:""). Returns a pointer to f.

int filename_expand(char *out, const char *in);

Splits in at each slash character. Replaces any occurrance of $X with getenv(X) (leaving it as $X if the environment variable does not exist). Replaces any occurances of ~X with user X's home directory (leaving it as ~X if the user does not exist). Any resulting double slashes cause everything before the second slash to be deleted. Copies the result to out (in and out may be the same buffer). Returns non-zero if any changes were made. In true retro programming style, it is up to you to provide a buffer big enough for the result. 1024 characters should be enough.

int filename_absolute(char *out, const char *in);