Hi all,
i want to replace $ to \$ so linux can work with paths and filenames
that contain $.
I wrote the following code
for(string::siz e_type i = s.find(exist, 0); i != string::npos; i =
s.find(foo, i))
{
s.replace(i, foo.size(), bar);
}
It's logical that this creates a loop that never ends, because i don't
replace the $, so my question is how to replace $ with \$ and then
jump to the next, instead of replacing \$ again..
tia... 5 7314
mr h q wrote: Hi all,
i want to replace $ to \$ so linux can work with paths and filenames that contain $. I wrote the following code
for(string::siz e_type i = s.find(exist, 0); i != string::npos; i = s.find(foo, i)) { s.replace(i, foo.size(), bar); }
It's logical that this creates a loop that never ends, because i don't replace the $, so my question is how to replace $ with \$ and then jump to the next, instead of replacing \$ again..
Well. If the $ happend to be at eg position 5 and you replace
$ with \$, then you know that the $ will move to position 6. Thus
if you continue searching at position 7, you will not interfere
with the text you replaced :-)
--
Karl Heinz Buchegger kb******@gascad .at
mr h q wrote: Hi all,
i want to replace $ to \$ so linux can work with paths and filenames that contain $. I wrote the following code
for(string::siz e_type i = s.find(exist, 0); i != string::npos; i = s.find(foo, i)) { s.replace(i, foo.size(), bar); }
It's logical that this creates a loop that never ends, because i don't replace the $, so my question is how to replace $ with \$ and then jump to the next, instead of replacing \$ again..
You have to start your following find() calls _after_ the replaced
string, not at the same location again. So try something like:
for(string::siz e_type i = s.find(exist, 0); i != string::npos;
i = s.find(foo, i + bar.size()))
{
s.replace(i, foo.size(), bar);
}
This should be save, since after the replacement, the string will be at
least i + bar.size() long.
On Mon, 24 Nov 2003 15:53:52 +0100, Karl Heinz Buchegger wrote: mr h q wrote: Hi all,
i want to replace $ to \$ so linux can work with paths and filenames
Well. If the $ happend to be at eg position 5 and you replace $ with \$, then you know that the $ will move to position 6. Thus if you continue searching at position 7, you will not interfere with the text you replaced :-)
In this case wouldn't the character that was originally at position 6 be
overwritten with $? I think he also needs to be careful to copy everything
after the $ to one position later in the string.
Rolf Magnus <ra******@t-online.de> wrote in message news:<bp******* ******@news.t-online.com>... mr h q wrote:
Hi all,
i want to replace $ to \$ so linux can work with paths and filenames that contain $. I wrote the following code
for(string::siz e_type i = s.find(exist, 0); i != string::npos; i = s.find(foo, i)) { s.replace(i, foo.size(), bar); }
It's logical that this creates a loop that never ends, because i don't replace the $, so my question is how to replace $ with \$ and then jump to the next, instead of replacing \$ again..
You have to start your following find() calls _after_ the replaced string, not at the same location again. So try something like:
for(string::siz e_type i = s.find(exist, 0); i != string::npos; i = s.find(foo, i + bar.size())) { s.replace(i, foo.size(), bar); }
This should be save, since after the replacement, the string will be at least i + bar.size() long.
It works now...thanks!!
Brad Marts wrote: On Mon, 24 Nov 2003 15:53:52 +0100, Karl Heinz Buchegger wrote:
mr h q wrote: Hi all,
i want to replace $ to \$ so linux can work with paths and filenames
Well. If the $ happend to be at eg position 5 and you replace $ with \$, then you know that the $ will move to position 6. Thus if you continue searching at position 7, you will not interfere with the text you replaced :-)
In this case wouldn't the character that was originally at position 6 be overwritten with $?
No, the test is *inserted*, meaning all text right to that position
gets shifted to the right.
If you replace $ with \$ in
abcd$efg
you get
abcd\$efg
The string got longer!
I think he also needs to be careful to copy everything after the $ to one position later in the string.
std::string.rep lace does that already.
The OP's question turns around the find function used to find the next occurence
of the text to replace:
abc$def$ghi
find finds the first $ at position 3. Replacing that with the replacement text
leads to
abc\$def$ghi
Now if the find is restarted at position 4, it immediatly will find another $
at position 4. Doing the replacement leads to
abc\\$def$ghi
and so on and so on. The solution of course is to start the next find at the
end of the replaced text.
--
Karl Heinz Buchegger kb******@gascad .at This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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