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How can I read a file backwards and copy it?
Example:
file 1:
a
b
c
file 2:
c
b
a
4 replies to this topic
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#2
Posted 23 December 2006 - 03:37 PM
cp2o
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Newbie
You could copy the file contents to a buffer then output them to another file backwards at your leisure?
Or, (assuming you're using C) you could look into the lseek() function which repositions the file offset - start at the end of the file, read a character, decrement the offset with lseek, repeat; then ouput the buffer to a new file?
I'm just a newbie, but those are my suggestions.
Or, (assuming you're using C) you could look into the lseek() function which repositions the file offset - start at the end of the file, read a character, decrement the offset with lseek, repeat; then ouput the buffer to a new file?
I'm just a newbie, but those are my suggestions.
May the source be with you... always
#3
Guest_Jordan_*
Posted 23 December 2006 - 04:01 PM
Guest_Jordan_*
Guest_Jordan_*
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I agree. If you are splitting the file by line breaks (which it looks like you are) you can just read the array backwards as you write.
#4
Posted 26 December 2006 - 08:13 AM
Lop
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Speaks fluent binary
You could always byte read it backwards.
#5
Posted 29 December 2006 - 09:55 AM
WingedPanther
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A spammer's worst nightmare
For C++, you could create a stack of strings, push strings on the stack as you read, then pop them to write the output.
What size files are you looking at working with?
What size files are you looking at working with?
