ref: 96c0fc6a33671822f63d5941e045c8f88e8e3241
parent: c65c52c0638fdfd3613fc7becd77410769ac62ec
author: giles <giles@ded80894-8fb9-0310-811b-c03f3676ab4d>
date: Wed May 7 18:44:43 EDT 2003
Add Theo deRaadt's portable (v)snprintf implementation for portability, under the BSD license, including advertising. A simple check was added to the configure script, but no prototypes, so it may not help any on systems without the functions. Submission from Jouk Jansen to allow compilation into Ghostscript on OpenVMS. (recommitted after repository became corrupt. original change date Wed May 7 04:17:39 2003) git-svn-id: http://svn.ghostscript.com/jbig2dec/trunk@250 ded80894-8fb9-0310-811b-c03f3676ab4d
--- a/configure.ac
+++ b/configure.ac
@@ -117,6 +117,10 @@
# Checks for library functions.
AC_FUNC_MEMCMP
+dnl we use realloc() but don't depend on the zero-lenght behavior
+dnl tested by AC_FUNC_REALLOC
+AC_REPLACE_FUNCS([snprintf])
+
AC_CHECK_FUNCS([memset strdup])
dnl use our included getopt if the system doesn't have getopt_long()
--- /dev/null
+++ b/snprintf.c
@@ -1,0 +1,161 @@
+/*
+ * 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/param.h>
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <signal.h>
+#include <stdio.h>
+#if __STDC__
+#include <stdarg.h>
+#include <stdlib.h>
+#else
+#include <varargs.h>
+#endif
+#include <setjmp.h>
+#include <unistd.h>
+#include <string.h>
+
+#ifndef roundup
+#define roundup(x, y) ((((x)+((y)-1))/(y))*(y))
+#endif
+
+#ifdef __sgi
+#define size_t ssize_t
+#endif
+
+static int pgsize;
+static char *curobj;
+static int caught;
+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 a )
+{+ 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);
+}
+