Import of OpenSSH 4.3p1

[gssapi-openssh.git] / openssh / openbsd-compat / bsd-asprintf.c

diff --git a/openssh/openbsd-compat/bsd-asprintf.c b/openssh/openbsd-compat/bsd-asprintf.c
new file mode 100644 (file)
index 0000000..5ca01f8
--- /dev/null
+++ b/openssh/openbsd-compat/bsd-asprintf.c
@@ -0,0 +1,95 @@
+/*
+ * Copyright (c) 2004 Darren Tucker.
+ *
+ * Based originally on asprintf.c from OpenBSD:
+ * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "includes.h"
+
+#ifndef HAVE_VASPRINTF
+
+#ifndef VA_COPY
+# ifdef HAVE_VA_COPY
+#  define VA_COPY(dest, src) va_copy(dest, src)
+# else
+#  ifdef HAVE___VA_COPY
+#   define VA_COPY(dest, src) __va_copy(dest, src)
+#  else
+#   define VA_COPY(dest, src) (dest) = (src)
+#  endif
+# endif
+#endif
+
+#define INIT_SZ        128
+
+int vasprintf(char **str, const char *fmt, va_list ap)
+{
+       int ret = -1;
+       va_list ap2;
+       char *string, *newstr;
+       size_t len;
+
+       VA_COPY(ap2, ap);
+       if ((string = malloc(INIT_SZ)) == NULL)
+               goto fail;
+
+       ret = vsnprintf(string, INIT_SZ, fmt, ap2);
+       if (ret >= 0 && ret < INIT_SZ) { /* succeeded with initial alloc */
+               *str = string;
+       } else if (ret == INT_MAX) { /* shouldn't happen */
+               goto fail;
+       } else {        /* bigger than initial, realloc allowing for nul */
+               len = (size_t)ret + 1;
+               if ((newstr = realloc(string, len)) == NULL) {
+                       free(string);
+                       goto fail;
+               } else {
+                       va_end(ap2);
+                       VA_COPY(ap2, ap);
+                       ret = vsnprintf(newstr, len, fmt, ap2);
+                       if (ret >= 0 && (size_t)ret < len) {
+                               *str = newstr;
+                       } else { /* failed with realloc'ed string, give up */
+                               free(newstr);
+                               goto fail;
+                       }
+               }
+       }
+       va_end(ap2);
+       return (ret);
+
+fail:
+       *str = NULL;
+       errno = ENOMEM;
+       va_end(ap2);
+       return (-1);
+}
+#endif
+
+#ifndef HAVE_ASPRINTF
+int asprintf(char **str, const char *fmt, ...)
+{
+       va_list ap;
+       int ret;
+       
+       *str = NULL;
+       va_start(ap, fmt);
+       ret = vasprintf(str, fmt, ap);
+       va_end(ap);
+
+       return ret;
+}
+#endif