105436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* Formatted output to strings. 205436638acc7c010349a69c3395f1a57c642dc62Ying Wang Copyright (C) 2004, 2006-2012 Free Software Foundation, Inc. 305436638acc7c010349a69c3395f1a57c642dc62Ying Wang Written by Simon Josefsson and Paul Eggert. 405436638acc7c010349a69c3395f1a57c642dc62Ying Wang 505436638acc7c010349a69c3395f1a57c642dc62Ying Wang This program is free software; you can redistribute it and/or modify 605436638acc7c010349a69c3395f1a57c642dc62Ying Wang it under the terms of the GNU General Public License as published by 705436638acc7c010349a69c3395f1a57c642dc62Ying Wang the Free Software Foundation; either version 3, or (at your option) 805436638acc7c010349a69c3395f1a57c642dc62Ying Wang any later version. 905436638acc7c010349a69c3395f1a57c642dc62Ying Wang 1005436638acc7c010349a69c3395f1a57c642dc62Ying Wang This program is distributed in the hope that it will be useful, 1105436638acc7c010349a69c3395f1a57c642dc62Ying Wang but WITHOUT ANY WARRANTY; without even the implied warranty of 1205436638acc7c010349a69c3395f1a57c642dc62Ying Wang MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 1305436638acc7c010349a69c3395f1a57c642dc62Ying Wang GNU General Public License for more details. 1405436638acc7c010349a69c3395f1a57c642dc62Ying Wang 1505436638acc7c010349a69c3395f1a57c642dc62Ying Wang You should have received a copy of the GNU General Public License along 1605436638acc7c010349a69c3395f1a57c642dc62Ying Wang with this program; if not, see <http://www.gnu.org/licenses/>. */ 1705436638acc7c010349a69c3395f1a57c642dc62Ying Wang 1805436638acc7c010349a69c3395f1a57c642dc62Ying Wang#include <config.h> 1905436638acc7c010349a69c3395f1a57c642dc62Ying Wang 2005436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* Specification. */ 2105436638acc7c010349a69c3395f1a57c642dc62Ying Wang#include <stdio.h> 2205436638acc7c010349a69c3395f1a57c642dc62Ying Wang 2305436638acc7c010349a69c3395f1a57c642dc62Ying Wang#include <errno.h> 2405436638acc7c010349a69c3395f1a57c642dc62Ying Wang#include <limits.h> 2505436638acc7c010349a69c3395f1a57c642dc62Ying Wang#include <stdarg.h> 2605436638acc7c010349a69c3395f1a57c642dc62Ying Wang#include <stdlib.h> 2705436638acc7c010349a69c3395f1a57c642dc62Ying Wang#include <string.h> 2805436638acc7c010349a69c3395f1a57c642dc62Ying Wang 2905436638acc7c010349a69c3395f1a57c642dc62Ying Wang#include "vasnprintf.h" 3005436638acc7c010349a69c3395f1a57c642dc62Ying Wang 3105436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* Print formatted output to string STR. Similar to sprintf, but 3205436638acc7c010349a69c3395f1a57c642dc62Ying Wang additional length SIZE limit how much is written into STR. Returns 3305436638acc7c010349a69c3395f1a57c642dc62Ying Wang string length of formatted string (which may be larger than SIZE). 3405436638acc7c010349a69c3395f1a57c642dc62Ying Wang STR may be NULL, in which case nothing will be written. On error, 3505436638acc7c010349a69c3395f1a57c642dc62Ying Wang return a negative value. */ 3605436638acc7c010349a69c3395f1a57c642dc62Ying Wangint 3705436638acc7c010349a69c3395f1a57c642dc62Ying Wangsnprintf (char *str, size_t size, const char *format, ...) 3805436638acc7c010349a69c3395f1a57c642dc62Ying Wang{ 3905436638acc7c010349a69c3395f1a57c642dc62Ying Wang char *output; 4005436638acc7c010349a69c3395f1a57c642dc62Ying Wang size_t len; 4105436638acc7c010349a69c3395f1a57c642dc62Ying Wang size_t lenbuf = size; 4205436638acc7c010349a69c3395f1a57c642dc62Ying Wang va_list args; 4305436638acc7c010349a69c3395f1a57c642dc62Ying Wang 4405436638acc7c010349a69c3395f1a57c642dc62Ying Wang va_start (args, format); 4505436638acc7c010349a69c3395f1a57c642dc62Ying Wang output = vasnprintf (str, &lenbuf, format, args); 4605436638acc7c010349a69c3395f1a57c642dc62Ying Wang len = lenbuf; 4705436638acc7c010349a69c3395f1a57c642dc62Ying Wang va_end (args); 4805436638acc7c010349a69c3395f1a57c642dc62Ying Wang 4905436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (!output) 5005436638acc7c010349a69c3395f1a57c642dc62Ying Wang return -1; 5105436638acc7c010349a69c3395f1a57c642dc62Ying Wang 5205436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (output != str) 5305436638acc7c010349a69c3395f1a57c642dc62Ying Wang { 5405436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (size) 5505436638acc7c010349a69c3395f1a57c642dc62Ying Wang { 5605436638acc7c010349a69c3395f1a57c642dc62Ying Wang size_t pruned_len = (len < size ? len : size - 1); 5705436638acc7c010349a69c3395f1a57c642dc62Ying Wang memcpy (str, output, pruned_len); 5805436638acc7c010349a69c3395f1a57c642dc62Ying Wang str[pruned_len] = '\0'; 5905436638acc7c010349a69c3395f1a57c642dc62Ying Wang } 6005436638acc7c010349a69c3395f1a57c642dc62Ying Wang 6105436638acc7c010349a69c3395f1a57c642dc62Ying Wang free (output); 6205436638acc7c010349a69c3395f1a57c642dc62Ying Wang } 6305436638acc7c010349a69c3395f1a57c642dc62Ying Wang 6405436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (INT_MAX < len) 6505436638acc7c010349a69c3395f1a57c642dc62Ying Wang { 6605436638acc7c010349a69c3395f1a57c642dc62Ying Wang errno = EOVERFLOW; 6705436638acc7c010349a69c3395f1a57c642dc62Ying Wang return -1; 6805436638acc7c010349a69c3395f1a57c642dc62Ying Wang } 6905436638acc7c010349a69c3395f1a57c642dc62Ying Wang 7005436638acc7c010349a69c3395f1a57c642dc62Ying Wang return len; 7105436638acc7c010349a69c3395f1a57c642dc62Ying Wang} 72