105436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* Formatted output to strings. 205436638acc7c010349a69c3395f1a57c642dc62Ying Wang Copyright (C) 2004, 2006-2012 Free Software Foundation, Inc. 305436638acc7c010349a69c3395f1a57c642dc62Ying Wang 405436638acc7c010349a69c3395f1a57c642dc62Ying Wang This program is free software: you can redistribute it and/or modify 505436638acc7c010349a69c3395f1a57c642dc62Ying Wang it under the terms of the GNU General Public License as published by 605436638acc7c010349a69c3395f1a57c642dc62Ying Wang the Free Software Foundation; either version 3 of the License, or 705436638acc7c010349a69c3395f1a57c642dc62Ying Wang (at your option) any later version. 805436638acc7c010349a69c3395f1a57c642dc62Ying Wang 905436638acc7c010349a69c3395f1a57c642dc62Ying Wang This program is distributed in the hope that it will be useful, 1005436638acc7c010349a69c3395f1a57c642dc62Ying Wang but WITHOUT ANY WARRANTY; without even the implied warranty of 1105436638acc7c010349a69c3395f1a57c642dc62Ying Wang MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 1205436638acc7c010349a69c3395f1a57c642dc62Ying Wang GNU General Public License for more details. 1305436638acc7c010349a69c3395f1a57c642dc62Ying Wang 1405436638acc7c010349a69c3395f1a57c642dc62Ying Wang You should have received a copy of the GNU General Public License 1505436638acc7c010349a69c3395f1a57c642dc62Ying Wang along with this program. If not, see <http://www.gnu.org/licenses/>. */ 1605436638acc7c010349a69c3395f1a57c642dc62Ying Wang 1705436638acc7c010349a69c3395f1a57c642dc62Ying Wang#if 1 1805436638acc7c010349a69c3395f1a57c642dc62Ying Wang# include <config.h> 1905436638acc7c010349a69c3395f1a57c642dc62Ying Wang#endif 2005436638acc7c010349a69c3395f1a57c642dc62Ying Wang 2105436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* Specification. */ 2205436638acc7c010349a69c3395f1a57c642dc62Ying Wang#include <stdio.h> 2305436638acc7c010349a69c3395f1a57c642dc62Ying Wang 2405436638acc7c010349a69c3395f1a57c642dc62Ying Wang#include <errno.h> 2505436638acc7c010349a69c3395f1a57c642dc62Ying Wang#include <limits.h> 2605436638acc7c010349a69c3395f1a57c642dc62Ying Wang#include <stdarg.h> 2705436638acc7c010349a69c3395f1a57c642dc62Ying Wang#include <stdint.h> 2805436638acc7c010349a69c3395f1a57c642dc62Ying Wang#include <stdlib.h> 2905436638acc7c010349a69c3395f1a57c642dc62Ying Wang 3005436638acc7c010349a69c3395f1a57c642dc62Ying Wang#include "vasnprintf.h" 3105436638acc7c010349a69c3395f1a57c642dc62Ying Wang 3205436638acc7c010349a69c3395f1a57c642dc62Ying Wang#ifndef SIZE_MAX 3305436638acc7c010349a69c3395f1a57c642dc62Ying Wang# define SIZE_MAX ((size_t) -1) 3405436638acc7c010349a69c3395f1a57c642dc62Ying Wang#endif 3505436638acc7c010349a69c3395f1a57c642dc62Ying Wang 3605436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* Print formatted output to string STR. 3705436638acc7c010349a69c3395f1a57c642dc62Ying Wang Return string length of formatted string. On error, return a negative 3805436638acc7c010349a69c3395f1a57c642dc62Ying Wang value. */ 3905436638acc7c010349a69c3395f1a57c642dc62Ying Wangint 4005436638acc7c010349a69c3395f1a57c642dc62Ying Wangsprintf (char *str, const char *format, ...) 4105436638acc7c010349a69c3395f1a57c642dc62Ying Wang{ 4205436638acc7c010349a69c3395f1a57c642dc62Ying Wang char *output; 4305436638acc7c010349a69c3395f1a57c642dc62Ying Wang size_t len; 4405436638acc7c010349a69c3395f1a57c642dc62Ying Wang size_t lenbuf; 4505436638acc7c010349a69c3395f1a57c642dc62Ying Wang va_list args; 4605436638acc7c010349a69c3395f1a57c642dc62Ying Wang 4705436638acc7c010349a69c3395f1a57c642dc62Ying Wang /* vasnprintf fails with EOVERFLOW when the buffer size argument is larger 4805436638acc7c010349a69c3395f1a57c642dc62Ying Wang than INT_MAX (if that fits into a 'size_t' at all). 4905436638acc7c010349a69c3395f1a57c642dc62Ying Wang Also note that glibc's iconv fails with E2BIG when we pass a length that 5005436638acc7c010349a69c3395f1a57c642dc62Ying Wang is so large that str + lenbuf wraps around, i.e. 5105436638acc7c010349a69c3395f1a57c642dc62Ying Wang (uintptr_t) (str + lenbuf) < (uintptr_t) str. 5205436638acc7c010349a69c3395f1a57c642dc62Ying Wang Therefore set lenbuf = min (SIZE_MAX, INT_MAX, - (uintptr_t) str - 1). */ 5305436638acc7c010349a69c3395f1a57c642dc62Ying Wang lenbuf = (SIZE_MAX < INT_MAX ? SIZE_MAX : INT_MAX); 5405436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (lenbuf > ~ (uintptr_t) str) 5505436638acc7c010349a69c3395f1a57c642dc62Ying Wang lenbuf = ~ (uintptr_t) str; 5605436638acc7c010349a69c3395f1a57c642dc62Ying Wang 5705436638acc7c010349a69c3395f1a57c642dc62Ying Wang va_start (args, format); 5805436638acc7c010349a69c3395f1a57c642dc62Ying Wang output = vasnprintf (str, &lenbuf, format, args); 5905436638acc7c010349a69c3395f1a57c642dc62Ying Wang len = lenbuf; 6005436638acc7c010349a69c3395f1a57c642dc62Ying Wang va_end (args); 6105436638acc7c010349a69c3395f1a57c642dc62Ying Wang 6205436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (!output) 6305436638acc7c010349a69c3395f1a57c642dc62Ying Wang return -1; 6405436638acc7c010349a69c3395f1a57c642dc62Ying Wang 6505436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (output != str) 6605436638acc7c010349a69c3395f1a57c642dc62Ying Wang { 6705436638acc7c010349a69c3395f1a57c642dc62Ying Wang /* len is near SIZE_MAX. */ 6805436638acc7c010349a69c3395f1a57c642dc62Ying Wang free (output); 6905436638acc7c010349a69c3395f1a57c642dc62Ying Wang errno = EOVERFLOW; 7005436638acc7c010349a69c3395f1a57c642dc62Ying Wang return -1; 7105436638acc7c010349a69c3395f1a57c642dc62Ying Wang } 7205436638acc7c010349a69c3395f1a57c642dc62Ying Wang 7305436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (len > INT_MAX) 7405436638acc7c010349a69c3395f1a57c642dc62Ying Wang { 7505436638acc7c010349a69c3395f1a57c642dc62Ying Wang errno = EOVERFLOW; 7605436638acc7c010349a69c3395f1a57c642dc62Ying Wang return -1; 7705436638acc7c010349a69c3395f1a57c642dc62Ying Wang } 7805436638acc7c010349a69c3395f1a57c642dc62Ying Wang 7905436638acc7c010349a69c3395f1a57c642dc62Ying Wang return len; 8005436638acc7c010349a69c3395f1a57c642dc62Ying Wang} 81