1 files changed, 127 insertions, 0 deletions
diff --git a/unicode/unicodebuf.c b/unicode/unicodebuf.c
new file mode 100644
index 0000000..66687c3
--- /dev/null
+++ b/unicode/unicodebuf.c
@@ -0,0 +1,127 @@
+/*
+** Copyright 2011 Double Precision, Inc.
+** See COPYING for distribution information.
+**
+*/
+
+#include	"unicode_config.h"
+#include	"unicode.h"
+#include	<stdlib.h>
+#include	<string.h>
+
+void unicode_buf_init(struct unicode_buf *p, size_t max)
+{
+	p->ptr=0;
+	p->size=0;
+	p->len=0;
+	p->max=max;
+}
+
+void unicode_buf_deinit(struct unicode_buf *p)
+{
+	if (p->ptr)
+		free(p->ptr);
+}
+
+int unicode_buf_append(struct unicode_buf *p,
+		       const unicode_char *uc, size_t l)
+{
+	if (l > p->max-p->len)
+		l=p->max-p->len;
+
+	if (p->len + l > p->size)
+	{
+		size_t n=(p->len + l) * 2;
+		unicode_char *newp;
+
+		if (n < 256)
+			n=256;
+
+		if (n > p->max)
+			n=p->max;
+
+		newp=p->ptr ? realloc(p->ptr, n * sizeof(unicode_char))
+			: malloc(n * sizeof(unicode_char));
+
+		if (!newp)
+			return -1;
+
+		p->ptr=newp;
+		p->size=n;
+	}
+
+	memcpy(p->ptr + p->len, uc, l * sizeof(unicode_char));
+
+	p->len += l;
+	return 0;
+}
+
+void unicode_buf_append_char(struct unicode_buf *dst,
+			     const char *str,
+			     size_t cnt)
+{
+	unicode_char unicode_buf[256];
+
+	while (cnt)
+	{
+		size_t n=sizeof(unicode_buf)/sizeof(unicode_buf[0]), i;
+
+		if (n > cnt)
+			n=cnt;
+
+		for (i=0; i<n; ++i)
+			unicode_buf[i]=(unsigned char)str[i];
+
+		str += n;
+		cnt -= n;
+		unicode_buf_append(dst, unicode_buf, i);
+	}
+}
+
+void unicode_buf_remove(struct unicode_buf *p,
+			size_t pos,
+			size_t cnt)
+{
+	if (pos > p->len)
+		pos=p->len;
+
+	if (cnt > p->len-pos)
+		cnt=p->len-pos;
+
+	if (cnt)
+		memmove(p->ptr+pos+cnt, p->ptr+pos, p->len-pos-cnt);
+	p->len -= cnt;
+}
+
+int unicode_buf_cmp(const struct unicode_buf *a,
+		    const struct unicode_buf *b)
+{
+	size_t i;
+
+	for (i=0; i<a->len && i<b->len; i++)
+	{
+		if (a->ptr[i] < b->ptr[i])
+			return -1;
+		if (a->ptr[i] > b->ptr[i])
+			return 1;
+	}
+
+	return (a->len < b->len ? -1:a->len > b->len ? 1:0);
+}
+
+int unicode_buf_cmp_str(const struct unicode_buf *p, const char *c,
+			size_t cl)
+{
+	size_t i;
+
+	for (i=0; i<p->len && i < cl; ++i)
+	{
+		if (p->ptr[i] < c[i])
+			return -1;
+
+		if (p->ptr[i] > c[i])
+			return 1;
+	}
+
+	return (p->len < cl ? -1: p->len > cl ? 1:0);
+}