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annotate lib/unistdio/u-vsprintf.h @ 18062:a1744ab6ea8e

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time_rz: fix off-by-one typo * lib/time_rz.c (extend_abbrs): Fix off-by-one typo.
author Paul Eggert <eggert@cs.ucla.edu>
date Sat, 25 Jul 2015 15:10:16 -0700
parents ab58d4870664
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* Formatted output to strings.
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2 Copyright (C) 1999, 2002, 2006-2015 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 it
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5 under the terms of the GNU Lesser General Public License as published
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6 by the Free Software Foundation; either version 3 of the License, or
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7 (at your option) 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 GNU
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12 Lesser 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 Lesser General Public License
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15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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16
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17 #ifndef SIZE_MAX
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18 # define SIZE_MAX ((size_t) -1)
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19 #endif
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20
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21 int
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22 VSPRINTF (DCHAR_T *buf, const FCHAR_T *format, va_list args)
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23 {
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24 /* Pass an infinite length. But note that *vasnprintf may fail if the buffer
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25 argument is larger than INT_MAX (if that fits into a 'size_t' at all).
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26 Also note that glibc's iconv fails with E2BIG when we pass a length that
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27 is so large that buf + length wraps around, i.e.
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28 (uintptr_t) (buf + length) < (uintptr_t) buf. */
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29 size_t length;
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30 DCHAR_T *result;
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31
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32 /* Set length = min (SIZE_MAX, INT_MAX, - (uintptr_t) buf - 1). */
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33 length = (SIZE_MAX < INT_MAX ? SIZE_MAX : INT_MAX);
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34 if (length > (~ (uintptr_t) buf) / sizeof (DCHAR_T))
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35 length = (~ (uintptr_t) buf) / sizeof (DCHAR_T);
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36
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37 result = VASNPRINTF (buf, &length, format, args);
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38 if (result == NULL)
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39 return -1;
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40
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41 /* The infinite buffer size guarantees that the result is not malloc()ed. */
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42 if (result != buf)
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43 {
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44 /* length is near SIZE_MAX. */
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45 free (result);
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46 errno = EOVERFLOW;
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47 return -1;
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48 }
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49
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50 if (length > INT_MAX)
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51 {
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52 errno = EOVERFLOW;
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53 return -1;
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54 }
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55
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56 /* Return the number of resulting units, excluding the trailing NUL. */
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57 return length;
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58 }