int wantwrite (searchlist,filename,fullname,prompt,warn);
char *searchlist,*filename,*fullname,*prompt;
int warn;
FILE *fwantwrite (searchlist,filename,fullname,prompt,warn);
char *searchlist,*filename,*fullname,*prompt;
int warn;
Searchlist is a list of directories which may be contain the file, with the directory names separated by colons. Filename is the name of the file the program wishes to open; if filename is the null string, then the user will be asked immediately for the name of a file to open. When a file is opened, the complete filename is copied into fullname, which must be a string provided by the user.
For each directory whose name appears in searchlist, the complete filename will be formed by contatenating a slash (/) and filename. Then, an attempt will be made to creat(2) the file. If warn is TRUE, then a check will first be made to ensure that the file does not already exist. If it does, the user will be asked if he wants to delete it; if he says "no", then no attempt will be made to creat (2) the file and searching will continue with the next directory.
If no attempt to open(2) the file is successful, then an error message is printed along with the message prompt, and the user can type in an alternate file name. The new file name is searched for using the same searchlist. The user may also indicate that no file is acceptable; in this case, wantwrite will return an error indication.
Fwantwrite is the same as wantwrite, but uses fopen(3) to create a buffered file, and returns a FILE pointer.
Fwantwrite returns 0 on error, or the FILE pointer of the successfully created file.
There should be a way to change the value of searchlist if the search for a file is unsuccessful.