Initial import

third_party/duktape/duk_debug_fixedbuffer.c

@@ -0,0 +1,69 @@
+/*
+ *  Fixed buffer helper useful for debugging, requires no allocation
+ *  which is critical for debugging.
+ */
+
+#include "third_party/duktape/duk_internal.h"
+
+#if defined(DUK_USE_DEBUG)
+
+DUK_INTERNAL void duk_fb_put_bytes(duk_fixedbuffer *fb, const duk_uint8_t *buffer, duk_size_t length) {
+	duk_size_t avail;
+	duk_size_t copylen;
+
+	avail = (fb->offset >= fb->length ? (duk_size_t) 0 : (duk_size_t) (fb->length - fb->offset));
+	if (length > avail) {
+		copylen = avail;
+		fb->truncated = 1;
+	} else {
+		copylen = length;
+	}
+	duk_memcpy_unsafe(fb->buffer + fb->offset, buffer, copylen);
+	fb->offset += copylen;
+}
+
+DUK_INTERNAL void duk_fb_put_byte(duk_fixedbuffer *fb, duk_uint8_t x) {
+	duk_fb_put_bytes(fb, (const duk_uint8_t *) &x, 1);
+}
+
+DUK_INTERNAL void duk_fb_put_cstring(duk_fixedbuffer *fb, const char *x) {
+	duk_fb_put_bytes(fb, (const duk_uint8_t *) x, (duk_size_t) DUK_STRLEN(x));
+}
+
+DUK_INTERNAL void duk_fb_sprintf(duk_fixedbuffer *fb, const char *fmt, ...) {
+	duk_size_t avail;
+	va_list ap;
+
+	va_start(ap, fmt);
+	avail = (fb->offset >= fb->length ? (duk_size_t) 0 : (duk_size_t) (fb->length - fb->offset));
+	if (avail > 0) {
+		duk_int_t res = (duk_int_t) DUK_VSNPRINTF((char *) (fb->buffer + fb->offset), avail, fmt, ap);
+		if (res < 0) {
+			/* error */
+		} else if ((duk_size_t) res >= avail) {
+			/* (maybe) truncated */
+			fb->offset += avail;
+			if ((duk_size_t) res > avail) {
+				/* actual chars dropped (not just NUL term) */
+				fb->truncated = 1;
+			}
+		} else {
+			/* normal */
+			fb->offset += (duk_size_t) res;
+		}
+	}
+	va_end(ap);
+}
+
+DUK_INTERNAL void duk_fb_put_funcptr(duk_fixedbuffer *fb, duk_uint8_t *fptr, duk_size_t fptr_size) {
+	char buf[64+1];
+	duk_debug_format_funcptr(buf, sizeof(buf), fptr, fptr_size);
+	buf[sizeof(buf) - 1] = (char) 0;
+	duk_fb_put_cstring(fb, buf);
+}
+
+DUK_INTERNAL duk_bool_t duk_fb_is_full(duk_fixedbuffer *fb) {
+	return (fb->offset >= fb->length);
+}
+
+#endif  /* DUK_USE_DEBUG */