2 * Revision 12: http://theos.com/~deraadt/snprintf.c
4 * Copyright (c) 1997 Theo de Raadt
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 #if !defined(HAVE_SNPRINTF) || !defined(HAVE_VSNPRINTF)
31 #include <sys/param.h>
32 #include <sys/types.h>
47 #define roundup(x, y) ((((x)+((y)-1))/(y))*(y))
53 static sigjmp_buf bail;
55 #define EXTRABYTES 2 /* XXX: why 2? you don't want to know */
57 #ifndef HAVE_GETPAGESIZE
63 #else /* !EXEC_PAGESIZE */
67 # endif /* No CLSIZE */
72 #endif /* EXEC_PAGESIZE */
74 #endif /* HAVE_GETPAGESIZE */
86 pgsize = getpagesize();
87 curobj = (char *)malloc(n + EXTRABYTES + pgsize * 2);
90 e = curobj + n + EXTRABYTES;
91 e = (char *)roundup((unsigned long)e, pgsize);
92 if (mprotect(e, pgsize, PROT_NONE) == -1) {
97 e = e - n - EXTRABYTES;
114 strncpy(str, p, n-1);
116 if (mprotect((caddr_t)(p + n + EXTRABYTES), pgsize,
117 PROT_READ|PROT_WRITE|PROT_EXEC) == -1)
118 mprotect((caddr_t)(p + n + EXTRABYTES), pgsize,
119 PROT_READ|PROT_WRITE);
123 #if !defined(HAVE_VSNPRINTF)
125 vsnprintf(str, n, fmt, ap)
131 struct sigaction osa, nsa;
133 int ret = n + 1; /* if we bail, indicated we overflowed */
135 memset(&nsa, 0, sizeof nsa);
136 nsa.sa_handler = mcatch;
137 sigemptyset(&nsa.sa_mask);
144 if (sigsetjmp(bail, 1) == 0) {
145 if (sigaction(SIGSEGV, &nsa, &osa) == -1) {
149 ret = vsprintf(p, fmt, ap);
152 (void) sigaction(SIGSEGV, &osa, NULL);
155 #endif /* !defined(HAVE_VSNPRINTF) */
157 #if !defined(HAVE_SNPRINTF)
160 snprintf(char *str, size_t n, char const *fmt, ...)
162 snprintf(str, n, fmt, va_alist)
176 return (vsnprintf(str, n, fmt, ap));
179 #endif /* !defined(HAVE_SNPRINTF) */
181 #endif /* !defined(HAVE_SNPRINTF) || !defined(HAVE_VSNPRINTF) */