From 37da2899f40661e3e9631e497da8dc59b971cbd0 Mon Sep 17 00:00:00 2001
From: "Charles.Forsyth" <devnull@localhost>
Date: Fri, 22 Dec 2006 17:07:39 +0000
Subject: 20060303a

---
 emu/port/latin1.c | 83 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 83 insertions(+)
 create mode 100644 emu/port/latin1.c

(limited to 'emu/port/latin1.c')

diff --git a/emu/port/latin1.c b/emu/port/latin1.c
new file mode 100644
index 00000000..9e8abf43
--- /dev/null
+++ b/emu/port/latin1.c
@@ -0,0 +1,83 @@
+#include "dat.h"
+
+/*
+ * The code makes two assumptions: strlen(ld) is 1 or 2; latintab[i].ld can be a
+ * prefix of latintab[j].ld only when j<i.
+ */
+static
+struct cvlist
+{
+	char	*ld;		/* must be seen before using this conversion */
+	char	*si;		/* options for last input characters */
+	char	*so;		/* the corresponding Rune for each si entry */
+} latintab[] = {
+#include "latin1.h"
+	0,	0,		0
+};
+
+/*
+ * Given 5 characters k[0]..k[4], find the rune or return -1 for failure.
+ */
+static long
+unicode(uchar *k)
+{
+	long i, c;
+
+	k++;	/* skip 'X' */
+	c = 0;
+	for(i=0; i<4; i++,k++){
+		c <<= 4;
+		if('0'<=*k && *k<='9')
+			c += *k-'0';
+		else if('a'<=*k && *k<='f')
+			c += 10 + *k-'a';
+		else if('A'<=*k && *k<='F')
+			c += 10 + *k-'A';
+		else
+			return -1;
+	}
+	return c;
+}
+
+/*
+ * Given n characters k[0]..k[n-1], find the corresponding rune or return -1 for
+ * failure, or something < -1 if n is too small.  In the latter case, the result
+ * is minus the required n.
+ */
+long
+latin1(uchar *k, int n)
+{
+	struct cvlist *l;
+	int c;
+	char* p;
+
+	if(k[0] == 'X')
+		if(n>=5)
+			return unicode(k);
+		else
+			return -5;
+	for(l=latintab; l->ld!=0; l++)
+		if(k[0] == l->ld[0]){
+			if(n == 1)
+				return -2;
+			if(l->ld[1] == 0)
+				c = k[1];
+			else if(l->ld[1] != k[1])
+				continue;
+			else if(n == 2)
+				return -3;
+			else
+				c = k[2];
+			for(p=l->si; *p!=0; p++)
+				if(*p == c) {
+					Rune r;
+					int i = p - l->si;
+					p = l->so;
+					for(; i >= 0; i--)
+						p += chartorune(&r, p);
+					return r;
+				}
+			return -1;
+		}
+	return -1;
+}
-- 
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