From ef12ae46318b4242a0c2d65e9627afa73dbe12fb Mon Sep 17 00:00:00 2001
From: Rob Pike <r@golang.org>
Date: Thu, 3 Jul 2008 13:42:04 -0700
Subject: drop some superfluous file prefixes in runtime

SVN=125956
---
 src/runtime/string.c | 220 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 220 insertions(+)
 create mode 100644 src/runtime/string.c

(limited to 'src/runtime/string.c')

diff --git a/src/runtime/string.c b/src/runtime/string.c
new file mode 100644
index 0000000000..9bac09184d
--- /dev/null
+++ b/src/runtime/string.c
@@ -0,0 +1,220 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "runtime.h"
+
+static	int32	empty		= 0;
+string	emptystring	= (string)&empty;
+
+int32
+findnull(int8 *s)
+{
+	int32 l;
+
+	for(l=0; s[l]!=0; l++)
+		;
+	return l;
+}
+
+void
+sys·catstring(string s1, string s2, string s3)
+{
+	uint32 l;
+
+	if(s1 == nil || s1->len == 0) {
+		s3 = s2;
+		goto out;
+	}
+	if(s2 == nil || s2->len == 0) {
+		s3 = s1;
+		goto out;
+	}
+
+	l = s1->len + s2->len;
+
+	s3 = mal(sizeof(s3->len)+l);
+	s3->len = l;
+	mcpy(s3->str, s1->str, s1->len);
+	mcpy(s3->str+s1->len, s2->str, s2->len);
+
+out:
+	FLUSH(&s3);
+}
+
+static void
+prbounds(int8* s, int32 a, int32 b, int32 c)
+{
+	int32 i;
+
+	prints(s);
+	prints(" ");
+	sys·printint(a);
+	prints("<");
+	sys·printint(b);
+	prints(">");
+	sys·printint(c);
+	prints("\n");
+	throw("bounds");
+}
+
+uint32
+cmpstring(string s1, string s2)
+{
+	uint32 i, l;
+	byte c1, c2;
+
+	if(s1 == nil)
+		s1 = emptystring;
+	if(s2 == nil)
+		s2 = emptystring;
+
+	l = s1->len;
+	if(s2->len < l)
+		l = s2->len;
+	for(i=0; i<l; i++) {
+		c1 = s1->str[i];
+		c2 = s2->str[i];
+		if(c1 < c2)
+			return -1;
+		if(c1 > c2)
+			return +1;
+	}
+	if(s1->len < s2->len)
+		return -1;
+	if(s1->len > s2->len)
+		return +1;
+	return 0;
+}
+
+void
+sys·cmpstring(string s1, string s2, int32 v)
+{
+	v = cmpstring(s1, s2);
+	FLUSH(&v);
+}
+
+int32
+strcmp(byte *s1, byte *s2)
+{
+	uint32 i;
+	byte c1, c2;
+
+	for(i=0;; i++) {
+		c1 = s1[i];
+		c2 = s2[i];
+		if(c1 < c2)
+			return -1;
+		if(c1 > c2)
+			return +1;
+		if(c1 == 0)
+			return 0;
+	}
+}
+
+void
+sys·slicestring(string si, int32 lindex, int32 hindex, string so)
+{
+	string s, str;
+	int32 l;
+
+	if(si == nil)
+		si = emptystring;
+
+	if(lindex < 0 || lindex > si->len ||
+	   hindex < lindex || hindex > si->len) {
+		sys·printpc(&si);
+		prints(" ");
+		prbounds("slice", lindex, si->len, hindex);
+	}
+
+	l = hindex-lindex;
+	so = mal(sizeof(so->len)+l);
+	so->len = l;
+	mcpy(so->str, si->str+lindex, l);
+	FLUSH(&so);
+}
+
+void
+sys·indexstring(string s, int32 i, byte b)
+{
+	if(s == nil)
+		s = emptystring;
+
+	if(i < 0 || i >= s->len) {
+		sys·printpc(&s);
+		prints(" ");
+		prbounds("index", 0, i, s->len);
+	}
+
+	b = s->str[i];
+	FLUSH(&b);
+}
+
+/*
+ * this is the plan9 runetochar
+ * extended for 36 bits in 7 bytes
+ * note that it truncates to 32 bits
+ * through the argument passing.
+ */
+static int32
+runetochar(byte *str, uint32 c)
+{
+	int32 i, n;
+	uint32 mask, mark;
+
+	/*
+	 * one character in 7 bits
+	 */
+	if(c <= 0x07FUL) {
+		str[0] = c;
+		return 1;
+	}
+
+	/*
+	 * every new character picks up 5 bits
+	 * one less in the first byte and
+	 * six more in an extension byte
+	 */
+	mask = 0x7ffUL;
+	mark = 0xC0UL;
+	for(n=1;; n++) {
+		if(c <= mask)
+			break;
+		mask = (mask<<5) | 0x1fUL;
+		mark = (mark>>1) | 0x80UL;
+	}
+
+	/*
+	 * lay down the bytes backwards
+	 * n is the number of extension bytes
+	 * mask is the max codepoint
+	 * mark is the zeroth byte indicator
+	 */
+	for(i=n; i>0; i--) {
+		str[i] = 0x80UL | (c&0x3fUL);
+		c >>= 6;
+	}
+
+	str[0] = mark|c;
+	return n+1;
+}
+
+void
+sys·intstring(int64 v, string s)
+{
+	int32 l;
+
+	s = mal(sizeof(s->len)+8);
+	s->len = runetochar(s->str, v);
+	FLUSH(&s);
+}
+
+void
+sys·byteastring(byte *a, int32 l, string s)
+{
+	s = mal(sizeof(s->len)+l);
+	s->len = l;
+	mcpy(s->str, a, l);
+	FLUSH(&s);
+}
-- 
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