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OwnedStringView: Add a method to extract a substring
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apio 2023-01-22 11:27:54 +01:00
parent 12d2039f68
commit cf8d3c6ff9
Signed by: apio
GPG Key ID: B8A7D06E42258954
2 changed files with 17 additions and 0 deletions
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3
luna/include/luna/OwnedStringView.h
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@ -5,6 +5,7 @@ class OwnedStringView
{
public:
OwnedStringView(char* c_str);
OwnedStringView(char* c_str, usize length);
OwnedStringView();
OwnedStringView(OwnedStringView&&);
OwnedStringView(const OwnedStringView&) = delete;
@ -12,6 +13,8 @@ class OwnedStringView
Result<OwnedStringView> clone() const;
Result<OwnedStringView> substring(usize begin, usize size) const;
static Result<OwnedStringView> from_string_literal(const char* str);
const char* chars() const

14
luna/src/OwnedStringView.cpp
View File

@ -21,6 +21,12 @@ OwnedStringView::OwnedStringView(char* c_str)
if (m_string) { m_length = strlen(m_string); }
}
OwnedStringView::OwnedStringView(char* c_str, usize length)
{
m_string = c_str;
m_length = length;
}
OwnedStringView::~OwnedStringView()
{
if (m_string) free_impl(m_string);
@ -31,6 +37,14 @@ Result<OwnedStringView> OwnedStringView::clone() const
return from_string_literal(m_string);
}
Result<OwnedStringView> OwnedStringView::substring(usize begin, usize size) const
{
if (begin + size >= size) return err(EINVAL);
char* const dup = strndup(m_string + begin, size);
if (!dup) return err(ENOMEM);
return OwnedStringView { dup, size };
}
const char& OwnedStringView::operator[](usize index) const
{
expect(index < m_length, "index out of range");