From: lew.pitcher@digitalfreehold.ca

On Sat, 06 Dec 2025 19:06:14 +0000, Scott Lurndal wrote:

> Lew Pitcher  writes:
>>On Sat, 06 Dec 2025 17:40:18 +0000, Scott Lurndal wrote:
>>
>>> Kaz Kylheku <046-301-5902@kylheku.com> writes:
>>>>On 2025-12-06, Michael Sanders  wrote:
>>>>> Am I close? Missing anything you'd consider to be (or not) needed?
>>>>>
>>>>>
>>>>>
>>>>> /*
>>>>>  * Checks if a file is likely a binary by examining its content
>>>>>  * for NULL bytes (0x00) or unusual control characters.
>>>>>  * Returns 0 if text, 1 if binary or file open failure.
>>>>>  */
>>>>>
>>>>> int is_binary_file(const char *path) {
>>>>
>>>>[ ... ]
>>>>
>>>>>     fclose(f);
>>>>>     return 0; // NOT binary
>>>>> }
>>>>
>>>>How about:
>>>>
>>>>int is_binary_file(const char *path)
>>>>{
>>>>  FILE *f = fopen(path);
>>>>
>>>>  if (f) {
>>>
>>>      while (isprint(getc(f)) {}
>>
>>The isprint function tests for any member of a locale-specific
>>set of characters (each of which occupies one printing position
>>on a display device) including space (' ').
>>
>>It effectively evaluates whether or not a given value is a
>>"printing character" in the execution characterset, not whether
>>or not a given value (from an outside file) is a text character.
>
> What is your definition of a "text" character?

I have none, for this case. However, the OP /might/ have one, given
that his code was an attempt to discern "text" files from "binary"
files.

>>
>>I'd use this function cautiously, as it will produce false
>>results when the characterset of the source data is not the the
>>execution characterset (think a Unicode UTF16 encoded text
>>file, and an ASCII execution characterset).
>>
>>>      return (!feof(f));
>>>
>>>    }
>>>    return 0;
>>>  }

--
Lew Pitcher
"In Skills We Trust"
Not LLM output - I'm just like this.

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