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265
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1 /* Formatted output to strings.
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2 Copyright (C) 2004, 2006-2008 Free Software Foundation, Inc.
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3 Written by Simon Josefsson and Yoann Vandoorselaere <yoann@prelude-ids.org>.
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4
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5 This program is free software; you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 2, or (at your option)
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8 any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License along
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16 with this program; if not, write to the Free Software Foundation,
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17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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18
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19 #ifdef HAVE_CONFIG_H
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20 # include <config.h>
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21 #endif
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22
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23 /* Specification. */
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24 #include <stdio.h>
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25
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26 #include <errno.h>
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27 #include <limits.h>
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28 #include <stdarg.h>
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29 #include <stdlib.h>
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30 #include <string.h>
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31
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32 #include "vasnprintf.h"
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33
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34 /* Print formatted output to string STR. Similar to vsprintf, but
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35 additional length SIZE limit how much is written into STR. Returns
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36 string length of formatted string (which may be larger than SIZE).
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37 STR may be NULL, in which case nothing will be written. On error,
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38 return a negative value. */
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39 int
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40 vsnprintf (char *str, size_t size, const char *format, va_list args)
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41 {
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42 char *output;
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43 size_t len;
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44 size_t lenbuf = size;
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45
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46 output = vasnprintf (str, &lenbuf, format, args);
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47 len = lenbuf;
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48
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49 if (!output)
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50 return -1;
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51
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52 if (output != str)
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53 {
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54 if (size)
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55 {
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56 size_t pruned_len = (len < size ? len : size - 1);
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57 memcpy (str, output, pruned_len);
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58 str[pruned_len] = '\0';
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59 }
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60
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61 free (output);
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62 }
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63
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64 if (len > INT_MAX)
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65 {
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66 errno = EOVERFLOW;
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67 return -1;
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68 }
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69
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70 return len;
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71 }
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