builtin: move C. calls to .c.v files (#11164)

vlib/builtin/string.v

@@ -55,12 +55,6 @@ mut:
 	is_lit int
 }
 
-// vstrlen returns the V length of the C string `s` (0 terminator is not counted).
-[unsafe]
-pub fn vstrlen(s &byte) int {
-	return unsafe { C.strlen(&char(s)) }
-}
-
 pub fn (s string) runes() []rune {
 	mut runes := []rune{cap: s.len}
 	for i := 0; i < s.len; i++ {
@@ -118,7 +112,7 @@ pub fn tos3(s &char) string {
 	}
 	return string{
 		str: &byte(s)
-		len: unsafe { C.strlen(s) }
+		len: unsafe { vstrlen_char(s) }
 	}
 }
 
@@ -147,7 +141,7 @@ pub fn tos5(s &char) string {
 pub fn (bp &byte) vstring() string {
 	return string{
 		str: unsafe { bp }
-		len: unsafe { C.strlen(&char(bp)) }
+		len: unsafe { vstrlen(bp) }
 	}
 }
 
@@ -168,7 +162,7 @@ pub fn (bp &byte) vstring_with_len(len int) string {
 pub fn (cp &char) vstring() string {
 	return string{
 		str: &byte(cp)
-		len: unsafe { C.strlen(cp) }
+		len: unsafe { vstrlen_char(cp) }
 		is_lit: 0
 	}
 }
@@ -195,7 +189,7 @@ pub fn (cp &char) vstring_with_len(len int) string {
 pub fn (bp &byte) vstring_literal() string {
 	return string{
 		str: unsafe { bp }
-		len: unsafe { C.strlen(&char(bp)) }
+		len: unsafe { vstrlen(bp) }
 		is_lit: 1
 	}
 }
@@ -218,7 +212,7 @@ pub fn (bp &byte) vstring_literal_with_len(len int) string {
 pub fn (cp &char) vstring_literal() string {
 	return string{
 		str: &byte(cp)
-		len: unsafe { C.strlen(cp) }
+		len: unsafe { vstrlen_char(cp) }
 		is_lit: 1
 	}
 }
@@ -251,7 +245,7 @@ pub fn (a string) clone() string {
 		len: a.len
 	}
 	unsafe {
-		C.memcpy(b.str, a.str, a.len)
+		vmemcpy(b.str, a.str, a.len)
 		b.str[a.len] = 0
 	}
 	return b
@@ -453,13 +447,11 @@ pub fn (s string) i16() i16 {
 
 // f32 returns the value of the string as f32 `'1.0'.f32() == f32(1)`.
 pub fn (s string) f32() f32 {
-	// return C.atof(&char(s.str))
 	return f32(strconv.atof64(s))
 }
 
 // f64 returns the value of the string as f64 `'1.0'.f64() == f64(1)`.
 pub fn (s string) f64() f64 {
-	// return C.atof(&char(s.str))
 	return strconv.atof64(s)
 }
 
@@ -494,7 +486,7 @@ fn (s string) == (a string) bool {
 		}
 	}
 	unsafe {
-		return C.memcmp(s.str, a.str, a.len) == 0
+		return vmemcmp(s.str, a.str, a.len) == 0
 	}
 }
 
@@ -1411,13 +1403,13 @@ pub fn (a []string) join(sep string) string {
 	mut idx := 0
 	for i, val in a {
 		unsafe {
-			C.memcpy(res.str + idx, val.str, val.len)
+			vmemcpy(res.str + idx, val.str, val.len)
 			idx += val.len
 		}
 		// Add sep if it's not last
 		if i != a.len - 1 {
 			unsafe {
-				C.memcpy(res.str + idx, sep.str, sep.len)
+				vmemcpy(res.str + idx, sep.str, sep.len)
 				idx += sep.len
 			}
 		}
@@ -1482,7 +1474,7 @@ pub fn (s string) bytes() []byte {
 		return []
 	}
 	mut buf := []byte{len: s.len}
-	unsafe { C.memcpy(buf.data, s.str, s.len) }
+	unsafe { vmemcpy(buf.data, s.str, s.len) }
 	return buf
 }