| /* Copyright (c) 2003, Joerg Wunsch |
| All rights reserved. |
| |
| Redistribution and use in source and binary forms, with or without |
| modification, are permitted provided that the following conditions are met: |
| |
| * Redistributions of source code must retain the above copyright |
| notice, this list of conditions and the following disclaimer. |
| * 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. |
| * Neither the name of the copyright holders nor the names of |
| contributors may be used to endorse or promote products derived |
| from this software without specific prior written permission. |
| |
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR CONTRIBUTORS 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. |
| */ |
| |
| /* $Id: vsnprintf.c 1944 2009-04-01 23:12:20Z arcanum $ */ |
| |
| #include <limits.h> |
| #include <stdarg.h> |
| #include <stdio.h> |
| #include "sectionname.h" |
| |
| ATTRIBUTE_CLIB_SECTION |
| int |
| vsnprintf(char *s, size_t n, const char *fmt, va_list ap) |
| { |
| FILE f; |
| int i; |
| |
| f.flags = __SWR | __SSTR; |
| f.buf = s; |
| /* Restrict max output length to 32767, as snprintf() return |
| signed int. The fputc() function uses a signed comparison |
| between estimated len and f.size field. So we can write a |
| negative value into f.size in the case of n was 0. Note, |
| that f.size will be a max number of nonzero symbols. */ |
| if ((int)n < 0) |
| n = (unsigned)INT_MAX + 1; /* 32768 */ |
| f.size = n - 1; /* -1,0,...32767 */ |
| |
| i = vfprintf(&f, fmt, ap); |
| |
| /* We use f.size (not 'n') as this is more effective: two 'ld' |
| instructions vs. two 'push+pop' and 'movw'. */ |
| if (f.size >= 0) |
| s[f.len < f.size ? f.len : f.size] = 0; |
| |
| return i; |
| } |