dmd.root.string

pure nothrow @nogc inout(char)[] toDString(inout(char)* s);

Slices a \0-terminated C-string, excluding the terminator

static pure nothrow @nogc bool iequals(const(char)[] s1, const(char)[] s2);

Compare two slices for equality, in a case-insensitive way

Comparison is based on char and does not do decoding. As a result, it's only really accurate for plain ASCII strings.

Parameters:

const(char)[] s1	string to compare
const(char)[] s2	string to compare

Returns:

true if s1 == s2 regardless of case

nothrow auto toCStringThen(alias dg)(const(char)[] src);

Copy the content of src into a C-string ('\0' terminated) then call dg

The intent of this function is to provide an allocation-less way to call a C function using a D slice. The function internally allocates a buffer if needed, but frees it on exit.

Note The argument to dg is scope. To keep the data around after dg exits, one has to copy it.

Parameters:

const(char)[] src	Slice to use to call the C function
dg	Delegate to call afterwards

Returns:

The return value of T

pure nothrow @nogc @safe string stripLeadingLineTerminator(string str);

Strips one leading line terminator of the given string.

The following are what the Unicode standard considers as line terminators:

Name	D Escape Sequence	Unicode Code Point
Line feed	\n	U+000A
Line tabulation	\v	U+000B
Form feed	\f	U+000C
Carriage return	\r	U+000D
Next line		U+0085
Line separator		U+2028
Paragraph separator		U+2029

This function will also strip \r\n.

@trusted int dstrcmp()(scope const char[] s1, scope const char[] s2);

A string comparison functions that returns the same result as strcmp

Note Strings are compared based on their ASCII values, no UTF-8 decoding.

Some C functions (e.g. qsort) require a int result for comparison.

See Also:

Druntime's core.internal.string

char[N + 1] toStaticArray(size_t N)(scope const(char)[N] literal);

Infers the length N of a string literal and coerces its type to a static array with length N + 1. Returns the string with a null character appended to the end.

Parameters:

const(char)[N] literal

string literal

Notes

• LDC produces quite optimal code for short strings:
  • https://d.godbolt.org/z/M69Z1g
  • https://gist.github.com/PetarKirov/338e4ab9292b6b2b311a3070572a07fb (backup URL)

Examples:

auto m = "123".toStaticArray;
const c = "123".toStaticArray;
immutable i = "123".toStaticArray;
enum e = "123".toStaticArray;

assert(m == "123\0");
assert(c == "123\0");
assert(i == "123\0");
static assert(e == "123\0");

const empty = "".toStaticArray;
static assert(empty.length == 1);
static assert(empty[0] == '\0');

pure nothrow @nogc @system bool startsWith(scope const(char)* p, scope const(char)[] needle);

Checks if C string p starts with needle.

Parameters:

const(char)* p	the C string to check
const(char)[] needle	the string to look for

Returns:

true if p starts with needle

Examples:

const buf = "123".toStaticArray;
const ptr = &buf[0];
assert(ptr.startsWith(""));
assert(ptr.startsWith("1"));
assert(ptr.startsWith("12"));
assert(ptr.startsWith("123"));
assert(!ptr.startsWith("1234"));