The Windows implementation of dialogs use the Win32 API, which expects the file filters to have null bytes as separator, and two null bytes at the end of the filter list. To help with string manipulation, the internal code uses 0x01 bytes instead of null bytes, and converts all 0x01 bytes into null bytes at the last moment. If someone decides to put two consecutive 0x01 bytes in their filter names, the code might mistakenly pick them up and convert them to null bytes, leading to Windows failing to pick up later filters. In practice, this is probably not so bad, since it requires someone to have control over file filters already, and allows at most ignoring the following file filters. It is also unlikely to happen by accident since 0x01 is not printable. This commit fixes that by replacing all the 0x01 bytes with the space character.
We require stdbool.h in the build environment, so we might as well use the plain bool type.
If your environment doesn't have stdbool.h, this simple replacement will suffice:
typedef signed char bool;
This fixes a bunch of issues with dialogs on Windows.
- Removed lpstrFileTitle assignation, which overwrote the buffer
- Increased the memory size available for long file selections
- Removed seemingly unused `default_folder` in win_Args struct
- Properly handle the case where only one file is selected in multiselect mode
- Properly handle the initial folder, which would fail in specific conditions
The details for the last entry are explained in a comment in the code.
- Add a globally-accessible function to handle the parsing of filter extensions
- Remove the ability of putting the wildcard ('*') among other patterns; it's either a list of patterns or a single '*' now
- Add a hint to select between portals and Zenity on Unix
