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* string.c (rb_str_getbyte): new method.

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(rb_str_setbyte): new method.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@15484 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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akr 2008-02-15 06:35:20 +00:00
parent b0333388ab
commit 12b1578cab
2 changed files with 50 additions and 0 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
Fri Feb 15 15:34:47 2008 Tanaka Akira <akr@fsij.org>
* string.c (rb_str_getbyte): new method.
(rb_str_setbyte): new method.
Fri Feb 15 15:29:03 2008 Tanaka Akira <akr@fsij.org>
* lib/require_relative.rb: new file.

45
string.c
View file

@ -3125,6 +3125,49 @@ rb_str_chr(VALUE str)
return rb_str_substr(str, 0, 1);
}
/*
* call-seq:
* str.getbyte(index) => 0 .. 255
*
* returns the <i>index</i>th byte as an integer.
*/
static VALUE
rb_str_getbyte(VALUE str, VALUE index)
{
long pos = NUM2LONG(index);
if (pos < 0)
pos += RSTRING_LEN(str);
if (pos < 0 || RSTRING_LEN(str) <= pos)
return Qnil;
return INT2FIX((unsigned char)RSTRING_PTR(str)[pos]);
}
/*
* call-seq:
* str.setbyte(index, int) => int
*
* modifies the <i>index</i>th byte as <i>int</i>.
*/
static VALUE
rb_str_setbyte(VALUE str, VALUE index, VALUE value)
{
long pos = NUM2LONG(index);
int byte = NUM2INT(value);
rb_str_modify(str);
if (pos < -RSTRING_LEN(str) || RSTRING_LEN(str) <= pos)
rb_raise(rb_eIndexError, "index %ld out of string", pos);
if (pos < 0)
pos += RSTRING_LEN(str);
RSTRING_PTR(str)[pos] = byte;
return value;
}
/*
* call-seq:
* str.reverse => new_str
@ -6107,6 +6150,8 @@ Init_String(void)
rb_define_method(rb_cString, "replace", rb_str_replace, 1);
rb_define_method(rb_cString, "clear", rb_str_clear, 0);
rb_define_method(rb_cString, "chr", rb_str_chr, 0);
rb_define_method(rb_cString, "getbyte", rb_str_getbyte, 1);
rb_define_method(rb_cString, "setbyte", rb_str_setbyte, 2);
rb_define_method(rb_cString, "to_i", rb_str_to_i, -1);
rb_define_method(rb_cString, "to_f", rb_str_to_f, 0);