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8373
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1 /* Formatted output to strings. |
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2 Copyright (C) 2004, 2006-2007 Free Software Foundation, Inc. |
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3 |
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4 This program is free software; you can redistribute it and/or modify |
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5 it under the terms of the GNU General Public License as published by |
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6 the Free Software Foundation; either version 2, or (at your option) |
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7 any later version. |
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8 |
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9 This program is distributed in the hope that it will be useful, |
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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12 GNU General Public License for more details. |
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13 |
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14 You should have received a copy of the GNU General Public License along |
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15 with this program; if not, write to the Free Software Foundation, |
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16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ |
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17 |
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18 #ifdef HAVE_CONFIG_H |
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19 # include <config.h> |
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20 #endif |
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21 |
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22 /* Specification. */ |
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23 #include <stdio.h> |
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24 |
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25 #include <errno.h> |
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26 #include <limits.h> |
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27 #include <stdarg.h> |
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28 #include <stdlib.h> |
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29 |
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30 #include "vasnprintf.h" |
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31 |
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32 /* Some systems, like OSF/1 4.0 and Woe32, don't have EOVERFLOW. */ |
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33 #ifndef EOVERFLOW |
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34 # define EOVERFLOW E2BIG |
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35 #endif |
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36 |
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37 #ifndef SIZE_MAX |
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38 # define SIZE_MAX ((size_t) -1) |
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39 #endif |
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40 |
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41 /* Print formatted output to string STR. |
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42 Return string length of formatted string. On error, return a negative |
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43 value. */ |
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44 int |
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45 sprintf (char *str, const char *format, ...) |
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46 { |
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47 char *output; |
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48 size_t len; |
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49 size_t lenbuf = SIZE_MAX; |
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50 va_list args; |
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51 |
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52 va_start (args, format); |
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53 output = vasnprintf (str, &lenbuf, format, args); |
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54 len = lenbuf; |
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55 va_end (args); |
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56 |
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57 if (!output) |
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58 return -1; |
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59 |
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60 if (output != str) |
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61 { |
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62 /* len is near SIZE_MAX. */ |
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63 free (output); |
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64 errno = EOVERFLOW; |
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65 return -1; |
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66 } |
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67 |
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68 if (len > INT_MAX) |
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69 { |
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70 errno = EOVERFLOW; |
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71 return -1; |
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72 } |
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73 |
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74 return len; |
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75 } |
