added from the citadel tree

diff --git a/gcit/libcli_cit/snprintf.c b/gcit/libcli_cit/snprintf.c
new file mode 100644 (file)
index 0000000..d4c39ba
--- /dev/null
+++ b/gcit/libcli_cit/snprintf.c
@@ -0,0 +1,83 @@
+/*
+ * modified from Sten Gunterberg's BUGTRAQ post of 22 Jul 1997
+ * --nathan bryant <bryant@cs.usm.maine.edu>
+ *
+ * $Id$
+ */
+
+/*
+ * Replacements for snprintf() and vsnprintf()
+ *
+ * Use it only if you have the "spare" cycles needed to effectively
+ * do every snprintf operation twice! Why is that? Because everything
+ * is first vfprintf()'d to /dev/null to determine the number of bytes.
+ * Perhaps a bit slow for demanding applications on slow machines,
+ * no problem for a fast machine with some spare cycles.
+ *
+ * You don't have a /dev/null? Every Linux contains one for free!
+ *
+ * Because the format string is never even looked at, all current and
+ * possible future printf-conversions should be handled just fine.
+ *
+ * Written July 1997 by Sten Gunterberg (gunterberg@ergon.ch)
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+
+static int
+needed (const char *fmt, va_list argp)
+{
+  static FILE *sink = NULL;
+
+  /* ok, there's a small race here that could result in the sink being
+   * opened more than once if we're threaded, but I'd rather ignore it than
+   * spend cycles synchronizing :-) */
+
+  if (sink == NULL)
+    {
+      if ((sink = fopen("/dev/null", "w")) == NULL)
+       {
+         perror("/dev/null");
+         exit(1);
+       }
+    }
+
+  return vfprintf(sink, fmt, argp);
+}
+
+int
+snprintf (char *buf, size_t max, const char *fmt, ...)
+{
+  va_list argp;
+  int bytes;
+
+  va_start(argp, fmt);
+  bytes = vsnprintf(buf, max, fmt, argp);
+  va_end(argp);
+
+  return bytes;
+}
+
+int
+vsnprintf (char *buf, size_t max, const char *fmt, va_list argp)
+{
+  char *p;
+  int size;
+
+  if ((p = malloc(needed(fmt, argp) + 1)) == NULL)
+    {
+      fprintf(stderr, "vsnprintf: malloc failed, aborting\n");
+      abort();
+    }
+
+  if ((size = vsprintf(p, fmt, argp)) >= max)
+    size = -1;
+
+  strncpy(buf, p, max);
+  buf[max - 1] = 0;
+  free(p);
+  return size;
+}