#64 Check for real changes of ext. mod files

[Markus Schwarzenberg]

With this patch nedit checks for real file contens
changes when the file timestamp changed. If the contens
isn't changed the warning "file has been modified by
another program ..." is omitted.

Patch against cvs as of 2002/08/30.

Warning: Based on an older version of the function
CheckForChangesToFile.

Markus Schwarzenberg

[Markus Schwarzenberg]

cvs diff -c > check-file-mod.diff

[Eddy De Greef]

Improved version - updated to cvs HEAD

[Eddy De Greef]

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I've attached an updated version of the path. It has some
improvements and bug fixes:
- It's updated to match current cvs HEAD
- The DOS and Unix/Mac file comparison have been merged
- memcmp is replaced by strncmp (memcmp is not POSIX)
- there's no more encapsulation breakage (file.c accessing
internals of textBuf)
- bug fix: 0-characters were not taken into account
- return values of comparison function were inconsistent
with comments (BufCmp doesn't use same convention) ->
simplified.
- contents comparison is now a preference: Warnings->Check
File Contents, default = On
- help has been updated (new preference)

Markus, if you have time, can you have a look at it to see
whether I haven't made any mistakes ? Thanks.

[Markus Schwarzenberg]

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Thanks, Eddy.

Your improvements look really good. I also did some basic
tests, everything worked as expected. From my point of view
this version is ready for commiting.

[Eddy De Greef]

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The patch is committed, with one addition: a mode message
appears if the comparison takes more than one 1 second.