kernel: Add string view and string builder

This makes write/read calls that use strings to communicate much
simpler and less error prone.

1 files changed, 30 insertions, 0 deletions

diff --git a/kernel/lib/sb.h b/kernel/lib/sb.h
new file mode 100644
index 0000000..8493997
--- /dev/null
+++ b/kernel/lib/sb.h
@@ -0,0 +1,30 @@
+#ifndef SB_H
+#define SB_H
+#include "sv.h"
+#include <stddef.h>
+#include <stdint.h>
+
+struct sb {
+  char *string;
+  size_t length;
+  size_t capacity;
+  uint8_t prebuffer;
+};
+
+struct sv;
+
+void sb_init(struct sb *ctx);
+int sb_init_capacity(struct sb *ctx, size_t starting_capacity);
+void sb_init_buffer(struct sb *ctx, char *buffer, size_t size);
+void sb_free(struct sb *ctx);
+void sb_reset(struct sb *ctx);
+int sb_isempty(const struct sb *ctx);
+int sb_append_char(struct sb *ctx, char c);
+int sb_delete_right(struct sb *ctx, size_t n);
+int sb_append(struct sb *ctx, const char *s);
+int sb_append_buffer(struct sb *ctx, const char *buffer,
+                      size_t length);
+int sb_append_sv(struct sb *ctx, struct sv sv);
+int sb_prepend_sv(struct sb *ctx, struct sv sv);
+int sb_prepend_buffer(struct sb *ctx, const char *buffer, size_t length);
+#endif