寻找一个分割路径名的库 [英] Looking for a library to split pathnames
问题描述
嗨
有没有人知道一个库提供了分割
路径名的功能。它应该有点像下面的代码片段：
-----------------
char * path =" / home / user / Documents / Textdocuments / Bills";
char ** dirs;
splitPath（path，dirs）;
------------------
`dirs''应包括：
dirs [0] ==" home"
dirs [1] ==" user"
....
dirs [4] ==" Bills"
有人知道这样的功能吗？
感谢您的帮助。
Sven-Thorsten Fahrbach
PS：如果存在更好的
等价物或它是''，它也可能是C ++函数更容易使用。我来自Perl背景和
我对C中的字符串操作不太熟悉。
Sven-Thorsten Fahrbach写道：
嗨
有谁知道提供的图书馆分割
路径名的功能。它应该有点像下面的代码片段：
我怀疑有人会很快说这是关于主题的:-)
un * x系统上的dirname（）和basename（）函数将完成你需要的大部分
。
如果这样是一个家庭作业问题（它闻起来有点像），我会看看
以下问题： -
*你怎么锻炼路径名中有多少个元素？
*你如何分配空间来保存指针数组？
*你如何填充指针数组？
如果您打算使用C语言，您可以使用
字符串处理。这不是很难。
ma ********** @ pobox.com 写道：
Sven-Thorsten Fahrbach写道：
>嗨
有没有人知道一个提供分割路径名功能的库。它应该有点像下面的代码片段：
我怀疑有人会很快说这是关于主题:-)
糟糕，抱歉。我不是常规的usenet用户;）。我只是不知道在哪里
发布此内容。
>
dirname（ ）和un * x系统上的basename（）函数将完成你需要的大部分
。
谢谢，我会看一下！
>
如果这是一个家庭作业问题（它有点像一个）[...]
不，它不是，老实说。 ;）我正在尝试编写一个小工具，需要
来完成这项工作。我已经使用过Perl，但我担心这可能太慢了。
$ blockquote class =post_quotes>
我会看看
以下问题： -
*你如何计算出路径名中有多少元素？
*你好吗？分配空间来保存指针数组？
*如何填充指针数组？
如果你打算用C工作，你可以像好好掌握
字符串处理。这并不困难。
我知道。我没有足够的练习。但即使它不是一个好的练习问题，它仍然是一个很好的练习！
感谢您的帮助！
Sven-Thorsten Fahrbach
Sven-Thorsten Fahrbach写道：
ma**********@pobox.com 写道：
Sven-Thorsten Fahrbach写道：
嗨
有谁知道图书馆提供分割
路径名的功能。它应该有点像下面的代码片段：
我怀疑有人会很快说这是关于主题:-)
糟糕，抱歉。我不是常规的usenet用户;）。我只是不知道
的其他地方发布这个。
如果它是关于便携式C标准的一部分，这是一个好地方
。如果它更具有平台特性，那么其他地方可能会更好（$。$ b $美元）。
但是，如果我们接受它作为字符串处理和内存分配
练习，它可能是主题:-)
un * x系统上的dirname（）和basename（）函数将完成你需要的大部分
。
谢谢，我会看看！
如果这是一个家庭作业问题（它有点像一个）[...]
不，老实说，不是。 ;）我正在尝试编写一个小工具，需要
来完成这项工作。我已经使用过Perl，但我担心这可能太慢了。
$ blockquote class =post_quotes>
我会看看
以下问题： -
*你如何计算出路径名中有多少元素？
*你好吗？分配空间来保存指针数组？
*如何填充指针数组？
如果你打算用C工作，你可以像好好掌握
字符串处理。这并不困难。
我知道。我没有足够的练习。但即使它不是一个家庭作业问题，它仍然是一个很好的练习！
好的 - 我会通过字符串计算元素的数量
count" /"字符，并适当调整可能性
相对路径名（无前导/）和空基本名称（尾随
" /"），然后是malloc（）或calloc（）指针数组的空间。
取决于你是想使用路径计数还是使用null
指针来划分数组，你可能需要在数组中添加一个额外的插槽
（我非常喜欢使用null作为分隔符）。
你清楚了吗？你想如何处理相对路径名
和null基本名称？
然后你可以使用strtok（） - 不是最好的函数，但它将
工作，通过路径名依次挑选个别元素
。
Hi
Does anybody know of a library that offers a function to split
pathnames. It should work somewhat like the following code snippet:
-----------------
char *path = "/home/user/Documents/Textdocuments/Bills";
char **dirs;
splitPath(path, dirs);
------------------
`dirs'' should then consist of:
dirs[0] == "home"
dirs[1] == "user"
....
dirs[4] == "Bills"
Does anybody know of a function like that?
Thanks for your help.
Sven-Thorsten Fahrbach
P.S.: It could also be a C++ function if there exists a better
equivalent or if it''s easier to use. I come from a Perl background and
I''m not that comfortable with string manipulation in C.
Sven-Thorsten Fahrbach wrote:
Hi
Does anybody know of a library that offers a function to split
pathnames. It should work somewhat like the following code snippet:I suspect someone will be along shortly to say this is Off-Topic :-)
The dirname() and basename() functions on un*x systems will do most of
what you need here.
If this is a homework question (it smells a bit like one), I''d look at
the following questions:-
* how do you work out how many elements are in the pathname?
* how do you allocate space to hold the array of pointers?
* how do you fill the array of pointers?
If you are going to work with C you may as well get to grips with
string handling. It''s not _that_ difficult.
ma**********@pobox.com wrote:Sven-Thorsten Fahrbach wrote:
>Hi
Does anybody know of a library that offers a function to split
pathnames. It should work somewhat like the following code snippet:
I suspect someone will be along shortly to say this is Off-Topic :-)Oops, sorry. I''m not a regular usenet user ;). I just didn''t know where
else to post this.
>
The dirname() and basename() functions on un*x systems will do most of
what you need here.Thanks, I''ll have a look into that!
>
If this is a homework question (it smells a bit like one) [...]No, it''s not, honestly. ;) I''m trying to write a small tool which needs
to do this job. I''d have used Perl but I fear it might be too slow for
my purposes.
I''d look at
the following questions:-
* how do you work out how many elements are in the pathname?
* how do you allocate space to hold the array of pointers?
* how do you fill the array of pointers?
If you are going to work with C you may as well get to grips with
string handling. It''s not _that_ difficult.I know. I just haven''t got enough practise. But even though it''s not a
homework question it might still be a good exercise!
Thanks for your help!
Sven-Thorsten Fahrbach
Sven-Thorsten Fahrbach wrote:
ma**********@pobox.com wrote:Sven-Thorsten Fahrbach wrote:
Hi
Does anybody know of a library that offers a function to split
pathnames. It should work somewhat like the following code snippet:I suspect someone will be along shortly to say this is Off-Topic :-)
Oops, sorry. I''m not a regular usenet user ;). I just didn''t know where
else to post this.If it''s about things which are part of the portable C standard, this is
a good place. If it''s more platform-specific, somewhere else may be
better (comp.unix.programmer?).
However, if we take it as a string handling and memory allocation
exercise, it''s probably on-topic :-)
The dirname() and basename() functions on un*x systems will do most of
what you need here.Thanks, I''ll have a look into that!
If this is a homework question (it smells a bit like one) [...]No, it''s not, honestly. ;) I''m trying to write a small tool which needs
to do this job. I''d have used Perl but I fear it might be too slow for
my purposes.
I''d look at
the following questions:-
* how do you work out how many elements are in the pathname?
* how do you allocate space to hold the array of pointers?
* how do you fill the array of pointers?
If you are going to work with C you may as well get to grips with
string handling. It''s not _that_ difficult.I know. I just haven''t got enough practise. But even though it''s not a
homework question it might still be a good exercise!OK - I''d count the number of elements by a pass through the string
counting "/" characters, and adjust appropriately for the possibility
of relative pathnames (no leading "/") and a null basename (a trailing
"/"), then malloc() or calloc() the space for the array of pointers.
Depending on whether you want to use a count of paths or have a null
pointer to delimit the array, you may need an extra slot in the array
(I quite like using a null as a delimiter).
Are you clear in your mind how you want to handle relative pathnames
and null basenames, by the way?
Then you could use strtok() - not the nicest function, but it would
work, to walk through the pathname picking out the individual elements
in turn.
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