1 files changed, 107 insertions, 0 deletions
diff --git a/usr/src/lib/libdemangle/common/strview.c b/usr/src/lib/libdemangle/common/strview.c
new file mode 100644
index 0000000000..e4576ee17a
--- /dev/null
+++ b/usr/src/lib/libdemangle/common/strview.c
@@ -0,0 +1,107 @@
+/*
+ * This file and its contents are supplied under the terms of the
+ * Common Development and Distribution License ("CDDL"), version 1.0.
+ * You may only use this file in accordance with the terms of version
+ * 1.0 of the CDDL.
+ *
+ * A full copy of the text of the CDDL should have accompanied this
+ * source.  A copy of the CDDL is also available via the Internet at
+ * http://www.illumos.org/license/CDDL.
+ */
+
+/*
+ * Copyright 2019, Joyent, Inc.
+ */
+
+#include <string.h>
+#include <sys/debug.h>
+#include "strview.h"
+
+void
+sv_init_sv(strview_t *sv, const strview_t *src)
+{
+	*sv = *src;
+}
+
+void
+sv_init_sv_range(strview_t *sv, const strview_t *src, size_t len)
+{
+	VERIFY3U(sv_remaining(src), >=, len);
+
+	sv->sv_first = src->sv_first;
+	sv->sv_last = src->sv_first + len;
+	sv->sv_rem = len;
+}
+
+void
+sv_init_str(strview_t *sv, const char *first, const char *last)
+{
+	if (last == NULL)
+		last = first + strlen(first);
+
+	VERIFY3P(first, <=, last);
+	sv->sv_first = first;
+	sv->sv_last = last;
+	sv->sv_rem = (size_t)(uintptr_t)(sv->sv_last - sv->sv_first);
+}
+
+size_t
+sv_remaining(const strview_t *sv)
+{
+	return (sv->sv_rem);
+}
+
+boolean_t
+sv_consume_if_c(strview_t *sv, char c)
+{
+	if (sv->sv_rem < 1 || *sv->sv_first != c)
+		return (B_FALSE);
+
+	sv->sv_first++;
+	sv->sv_rem--;
+	return (B_TRUE);
+}
+
+boolean_t
+sv_consume_if(strview_t *sv, const char *str)
+{
+	size_t slen = strlen(str);
+
+	if (sv->sv_rem < slen)
+		return (B_FALSE);
+	if (strncmp(sv->sv_first, str, slen) != 0)
+		return (B_FALSE);
+
+	sv->sv_first += slen;
+	sv->sv_rem -= slen;
+	return (B_TRUE);
+}
+
+char
+sv_peek(const strview_t *sv, ssize_t n)
+{
+	const char *p;
+
+	p = (n >= 0) ? sv->sv_first + n : sv->sv_last + n;
+	return ((p >= sv->sv_first && p < sv->sv_last) ? *p : '\0');
+}
+
+char
+sv_consume_c(strview_t *sv)
+{
+	char c = '\0';
+
+	if (sv->sv_first < sv->sv_last) {
+		c = *sv->sv_first++;
+		sv->sv_rem--;
+	}
+	return (c);
+}
+
+void
+sv_consume_n(strview_t *sv, size_t n)
+{
+	VERIFY3U(sv->sv_rem, >=, n);
+	sv->sv_first += n;
+	sv->sv_rem -= n;
+}