1 files changed, 129 insertions, 0 deletions
diff --git a/libbanshee/engine/buffer.c b/libbanshee/engine/buffer.c
new file mode 100644
index 00000000000..68f062d365c
--- /dev/null
+++ b/libbanshee/engine/buffer.c
@@ -0,0 +1,129 @@
+/*
+ * Copyright (c) 2000-2001
+ *      The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ */
+
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+#include "buffer.h"
+
+/* Invariant: buffer always null-terminated */
+struct growbuf
+{
+  region r;
+  unsigned int maxsize, cursize;
+  char *buffer;
+};
+
+/* Make a new buffer with initial size */
+growbuf growbuf_new(region r, int size)
+{
+  growbuf b = ralloc(r, struct growbuf);
+
+  assert(size > 0);
+  b->r = r;
+  b->maxsize = size; /* Force some growth! */
+  b->cursize = 1;
+  b->buffer = rstralloc(r, size);
+  b->buffer[0] = '\0';
+  return b;
+}
+
+/* Empty a buffer */
+void growbuf_reset(growbuf b)
+{
+  assert(b->maxsize > 0);
+  b->cursize = 1;
+  b->buffer[0] = '\0';
+}
+
+/* Print to a buffer */
+int gprintf(growbuf b, const char *fmt, ...)
+{
+  va_list args;
+  va_start(args, fmt);
+  return gvprintf(b, fmt, args);
+}
+
+/* Print to a buffer */
+int gvprintf(growbuf b, const char *fmt, va_list args)
+{
+  int nchars;
+
+  if (!fmt) /* Bug (?)/feature of vnsprintf -- printing \0 returns -1,
+	       goes into infinite loop. */
+    return 0;
+  while (1)
+    {
+      char *bufStart;
+      int sizeLeft;
+
+      bufStart = b->buffer + b->cursize - 1; /* chop trailing \0 */
+      sizeLeft = b->maxsize - b->cursize + 1; /* +1 size we're chooping
+						 the trailing \0 */
+      assert(*bufStart == '\0');
+      nchars = vsnprintf(bufStart, sizeLeft, fmt, args);
+      if (nchars > -1 && nchars < sizeLeft)
+	{
+	  b->cursize += nchars; /* nchars doesn't include \0,
+				   but we overwrote our \0 */
+	  break;
+	}
+      else
+	{
+	  /* How much room do we need?  In the new glibc, nchars
+	     tells us how much (not including the trailing null).
+	     So we need the current size, -1 since we'll remove the null,
+	     plus the new size, plus 1 for the new null. */
+	  int newSize = (nchars > -1) ? b->cursize - 1 + nchars + 1
+	                              : b->maxsize * 2;
+	  char *newBuf;
+
+	  /* fprintf(stderr, "Reallocating buffer, newSize=%d\n", newSize); */
+	  newBuf = rstralloc(b->r, newSize);
+	  memcpy(newBuf, b->buffer, b->cursize);
+	  newBuf[b->cursize-1] = '\0';  /* vsnprintf has printed something! */
+	  b->buffer = newBuf;
+	  b->maxsize = newSize;
+	  /* b->cursize unchanged */
+	}
+    }
+  return nchars;
+}
+
+/* Get the contents of a buffer */
+char *growbuf_contents(growbuf b)
+{
+  return b->buffer;
+}
+
+bool growbuf_empty(growbuf b)
+{
+  return b->cursize == 1; /* Buffer always null terminated */
+}