Rb_str_chomp or rb_str_strip

ruby-talk
1

How do I access the chomp(!) or strip(!) functions in C?

The all appear to be static.

Thanks

···

–
Jim Freeze

Truth will be out this morning. (Which may really mess things up.)

2

How do I access the chomp(!) or strip(!) functions in C?

res = rb_funcall2(str, rb_intern("strip"), 0, 0);

res = rb_funcall2(str, rb_intern("chomp"), 0, 0);

         *or*

res = rb_funcall(str, rb_intern("chomp"), 1, rb_str_new2("uu"));

Guy Decoux

3

Jim Freeze wrote:

How do I access the chomp(!) or strip(!) functions in C?

You’ll probably need to call them indirectly using rb_funcall(), i.e.

 VALUE inString, outString;

 outString = rb_funcall(inString, rb_intern("chomp"), 0, NULL);

Hope this helps,

Lyle

4

is #chomp! called via:

res = rb_funcall2(str, rb_intern(“chomp!”), 0, 0);

If so, is str modified or is res the new string?

···

On Saturday, 12 April 2003 at 1:00:44 +0900, ts wrote:

How do I access the chomp(!) or strip(!) functions in C?

res = rb_funcall2(str, rb_intern(“strip”), 0, 0);

res = rb_funcall2(str, rb_intern(“chomp”), 0, 0);

–
Jim Freeze

A CONS is an object which cares.
– Bernie Greenberg.

5

is #chomp! called via:

  res = rb_funcall2(str, rb_intern("chomp!"), 0, 0);

If so, is str modified or is res the new string?

str is modified, res is str if chomp! was successfull or nil

Like ruby :slight_smile:

pigeon% ruby -e 'a = "aaa"; b = a.chomp!; p a, b'
"aaa"
nil
pigeon%

pigeon% ruby -e 'a = "aaa\n"; b = a.chomp!; p a, b; b[1]="x"; p a, b'
"aaa"
"aaa"
"axa"
"axa"
pigeon%

Guy Decoux

6

Is there an efficient way to test for a character in a string?

Using rb_funcall, I could do:

VALUE testchr = rb_str_new(“+”, 1);
VALUE chr = rb_funcall(str,rb_intern(“”), 1, INT2FIX(0));

Now that I have testchr and chr, I don’t know how to compare them.
and, it seems awfully inefficient.

I’d rather do someting like:

if ( ‘+’ == *(RSTRING(str)->ptr) ) {

but this doesn’t seem to work either.

Any help would be appreciated.

Thanks

···

On Saturday, 12 April 2003 at 1:58:00 +0900, ts wrote:

is #chomp! called via:

res = rb_funcall2(str, rb_intern(“chomp!”), 0, 0);

–
Jim Freeze

Captain Penny’s Law:
You can fool all of the people some of the time, and some of
the people all of the time, but you Can’t Fool Mom.

7

By the time you’ve done RSTRING you’ve got yourself a char* pointer, so have
a look at memchr() in the standard C library. Of course, this means you’ve
now moved away from Ruby programming and into C programming :slight_smile:

Regards,

Brian.

···

On Sat, Apr 12, 2003 at 02:46:42AM +0900, Jim Freeze wrote:

On Saturday, 12 April 2003 at 1:58:00 +0900, ts wrote:

is #chomp! called via:

res = rb_funcall2(str, rb_intern(“chomp!”), 0, 0);

Is there an efficient way to test for a character in a string?

Using rb_funcall, I could do:

VALUE testchr = rb_str_new(“+”, 1);
VALUE chr = rb_funcall(str,rb_intern(“”), 1, INT2FIX(0));

Now that I have testchr and chr, I don’t know how to compare them.
and, it seems awfully inefficient.

I’d rather do someting like:

if ( ‘+’ == *(RSTRING(str)->ptr) ) {

but this doesn’t seem to work either.

8

Sorry I mis-read your posting. I don’t know why the line you just wrote
doesn’t work. You might want to check for RSTRING(str)->len > 0 first
though, and perhaps also make sure that TYPE(str) == T_STRING

See also the macro ‘NUM2CHR’ in ruby.h

Regards,

Brian.

···

On Fri, Apr 11, 2003 at 07:33:56PM +0100, Brian Candler wrote:

I’d rather do someting like:

if ( ‘+’ == *(RSTRING(str)->ptr) ) {

but this doesn’t seem to work either.