[Octave-bug-tracker] [bug #55577] textscan should reject any single-precision arg as invalid (file-io.cc-tst BIST test failure)

[Kai Torben Ohlhus]

Follow-up Comment #11, bug #55577 (project octave):

Answering comment #10 with additions:


>> fid = fopen ('existing-text-file.txt')
fid =

     3
>> class (fid)
ans =

    'double'
>> fopen (fid)          % no output == no 'ans'
>> fopen (double (fid)) % no output == no 'ans'
>> fopen (single (fid))
Error using fopen
First input must be a file name or a file identifier.
>> fopen (int32 (fid))
Error using fopen
First input must be a file name or a file identifier.
>> fopen (int64 (fid))
Error using fopen
First input must be a file name or a file identifier.
>> fopen (uint64 (fid))
Error using fopen
First input must be a file name or a file identifier.
>> fgetl (double (fid))
ans =

    -1
>> fgetl (single (fid))
Error using fgets
Invalid file identifier. Use fopen to generate a valid file identifier.

Error in fgetl (line 32)
[tline,lt] = fgets(fid);
>> fgetl (int32 (fid))
Error using fgets
Invalid file identifier. Use fopen to generate a valid file identifier.

Error in fgetl (line 32)
[tline,lt] = fgets(fid);


Quoting "help fopen" (not the same as the online documentation):

> FID is a scalar MATLAB integer valued double, called a file identifier. You
use FID as the first argument to other file input/output routines, such as
FREAD and FCLOSE. If fopen cannot open the file, it returns -1.

So I think "double" is the only valid file handle data type in Matlab.

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