1 files changed, 180 insertions, 0 deletions

diff --git a/libical/src/libical/vsnprintf.c b/libical/src/libical/vsnprintf.c
new file mode 100644
index 0000000..88a8c63
--- a/dev/null
+++ b/libical/src/libical/vsnprintf.c
@@ -0,0 +1,180 @@
+#ifdef __osf__
+/*
+ * Revision 12: http://theos.com/~deraadt/snprintf.c
+ *
+ * Copyright (c) 1997 Theo de Raadt
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 <sys/types.h>
+#include <stdio.h>
+
+#include <unistd.h>
+#include <sys/param.h>
+#include <sys/mman.h>
+#include <signal.h>
+
+#include <string.h>
+#if __STDC__
+#include <stdarg.h>
+#include <stdlib.h>
+#else
+#include <varargs.h>
+#endif
+#include <setjmp.h>
+
+#ifndef roundup
+#define roundup(x, y) ((((x)+((y)-1))/(y))*(y))
+#endif
+
+static int pgsize;
+static char *curobj;
+static sigjmp_buf bail;
+
+        #define EXTRABYTES      2/* XXX: why 2? you don't want to know */
+
+static char *
+msetup(str, n)
+        char *str;
+        size_t n;
+{
+        char *e;
+
+        if (n == 0)
+                return NULL;
+        if (pgsize == 0)
+                pgsize = getpagesize();
+        curobj = (char *)malloc(n + EXTRABYTES + pgsize * 2);
+        if (curobj == NULL)
+                return NULL;
+        e = curobj + n + EXTRABYTES;
+        e = (char *)roundup((unsigned long)e, pgsize);
+        if (mprotect(e, pgsize, PROT_NONE) == -1) {
+                free(curobj);
+                curobj = NULL;
+                return NULL;
+        }
+        e = e - n - EXTRABYTES;
+        *e = '\0';
+        return (e);
+}
+
+static void
+mcatch(int i)
+{
+        siglongjmp(bail, 1);
+}
+
+static void
+mcleanup(str, n, p)
+        char *str;
+        size_t n;
+        char *p;
+{
+        strncpy(str, p, n-1);
+        str[n-1] = '\0';
+        if (mprotect((caddr_t)(p + n + EXTRABYTES), pgsize,
+            PROT_READ|PROT_WRITE|PROT_EXEC) == -1)
+                mprotect((caddr_t)(p + n + EXTRABYTES), pgsize,
+                    PROT_READ|PROT_WRITE);
+        free(curobj);
+}
+
+int
+#if __STDC__
+vsnprintf(char *str, size_t n, char const *fmt, va_list ap)
+#else
+vsnprintf(str, n, fmt, ap)
+        char *str;
+        size_t n;
+        char *fmt;
+        char *ap;
+#endif
+{
+        struct sigaction osa, nsa;
+        char *p;
+                int ret = n + 1;/* if we bail, indicated we overflowed */
+
+        memset(&nsa, 0, sizeof nsa);
+        nsa.sa_handler = mcatch;
+        sigemptyset(&nsa.sa_mask);
+
+        p = msetup(str, n);
+        if (p == NULL) {
+                *str = '\0';
+                return 0;
+        }
+        if (sigsetjmp(bail, 1) == 0) {
+                if (sigaction(SIGSEGV, &nsa, &osa) == -1) {
+                        mcleanup(str, n, p);
+                        return (0);
+                }
+                ret = vsprintf(p, fmt, ap);
+        }
+        mcleanup(str, n, p);
+        (void) sigaction(SIGSEGV, &osa, NULL);
+        return (ret);
+}
+
+int
+#if __STDC__
+snprintf(char *str, size_t n, char const *fmt, ...)
+#else
+snprintf(str, n, fmt, va_alist)
+        char *str;
+        size_t n;
+        char *fmt;
+        va_dcl
+#endif
+{
+        va_list ap;
+#if __STDC__
+        va_start(ap, fmt);
+#else
+        va_start(ap);
+#endif
+
+        return (vsnprintf(str, n, fmt, ap));
+        va_end(ap);
+}
+
+#elif defined ( _WIN32 )
+
+#include <stdio.h>
+#include <stdarg.h>
+
+int snprintf(char *str, size_t n, char const *fmt, ...)
+{
+        va_list ap;
+        va_start(ap, fmt);
+        
+  return _snprintf(str, n, fmt, ap);
+}
+
+#else
+/* ANSI C forbids an empty source file... */
+
+static void vsnprintf_dummy_func() {
+   vsnprintf_dummy_func();
+}
+
+#endif