libc: Add sb_prepend_buffer

2 files changed, 10 insertions, 5 deletions

diff --git a/userland/libc/include/tb/sb.h b/userland/libc/include/tb/sb.h
index 06aa084..c2fa1cf 100644
--- a/userland/libc/include/tb/sb.h
+++ b/userland/libc/include/tb/sb.h
@@ -22,4 +22,5 @@ void sb_append_buffer(struct sb *ctx, const char *buffer,
                       size_t length);
 void sb_append_sv(struct sb *ctx, struct sv sv);
 void sb_prepend_sv(struct sb *ctx, struct sv sv);
+void sb_prepend_buffer(struct sb *ctx, const char *buffer, size_t length);
 #endif
diff --git a/userland/libc/tb/sb.c b/userland/libc/tb/sb.c
index f4e10f8..7ba83af 100644
--- a/userland/libc/tb/sb.c
+++ b/userland/libc/tb/sb.c
@@ -50,13 +50,17 @@ void sb_append(struct sb *ctx, const char *s) {
 }
 
 void sb_prepend_sv(struct sb *ctx, struct sv sv) {
-  if (sv.length > ctx->capacity - ctx->length) {
-    ctx->capacity += sv.length;
+  sb_prepend_buffer(ctx, sv.s, sv.length);
+}
+
+void sb_prepend_buffer(struct sb *ctx, const char *buffer, size_t length) {
+  if (length > ctx->capacity - ctx->length) {
+    ctx->capacity += length;
     ctx->string = realloc(ctx->string, ctx->capacity);
   }
-  memmove(ctx->string + sv.length, ctx->string, ctx->length);
-  memcpy(ctx->string, sv.s, sv.length);
-  ctx->length += sv.length;
+  memmove(ctx->string + length, ctx->string, ctx->length);
+  memcpy(ctx->string, buffer, length);
+  ctx->length += length;
 }
 
 void sb_append_buffer(struct sb *ctx, const char *buffer, size_t length) {