init

1 files changed, 77 insertions, 0 deletions

diff --git a/src/slice.c b/src/slice.c
new file mode 100644
index 0000000..eb88f93
--- /dev/null
+++ b/src/slice.c
@@ -0,0 +1,77 @@
+#include "slice.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+struct slice
+slice_new(const char *str, size_t start, size_t end)
+{
+	struct slice slice = {
+		.str = str,
+		.start = start,
+		.end = end,
+	};
+
+	return slice;
+}
+
+struct slice
+slice_fullstr(const char *str)
+{
+	struct slice slice = {
+		.str = str,
+		.start = 0,
+		.end = strlen(str),
+	};
+
+	return slice;
+}
+
+void
+slice_set(struct slice *slice, const char *str, size_t start, size_t end)
+{
+	slice->str = str;
+	slice->start = start;
+	slice->end = end;
+}
+
+size_t
+slice_len(const struct slice *slice)
+{
+	return slice->end - slice->start;
+}
+
+int
+slice_cmp(const struct slice *restrict a, const struct slice *restrict b)
+{
+	size_t lena = slice_len(a), lenb = slice_len(b);
+	int lencmp = (lena > lenb) - (lena < lenb);
+	if (lencmp) {
+		return lencmp;
+	}
+
+	for (size_t i = 0; i < lena; i++) {
+		char ca = a->str[a->start + i], cb = b->str[b->start + i];
+		int cmp = (ca > cb) - (ca < cb);
+		if (cmp) return cmp;
+	}
+
+	return 0;
+}
+
+void
+slice_cpy(struct slice *dst, const struct slice *src)
+{
+	dst->str = src->str;
+	dst->start = src->start;
+	dst->end = src->end;
+}
+
+char *
+slice_sprint(struct slice *slice, char *str)
+{
+	size_t len = slice->end - slice->start;
+	strncpy(str, slice->str + slice->start, len);
+	str[len] = '\0';
+	return str;
+}