Mercurial > hg > octave-shane > gnulib-hg
annotate lib/vsprintf.c @ 17255:d81be792518a
update from texinfo
| author | Karl Berry <karl@freefriends.org> |
|---|---|
| date | Tue, 01 Jan 2013 15:51:49 -0800 |
| parents | e542fd46ad6f |
| children | 344018b6e5d7 |
| rev | line source |
|---|---|
| 8371 | 1 /* Formatted output to strings. |
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maint: update all copyright year number ranges
Eric Blake <eblake@redhat.com>
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2 Copyright (C) 2004, 2006-2013 Free Software Foundation, Inc. |
| 8371 | 3 |
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Change copyright notice from GPLv2+ to GPLv3+.
Bruno Haible <bruno@clisp.org>
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4 This program is free software: you can redistribute it and/or modify |
| 8371 | 5 it under the terms of the GNU General Public License as published by |
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Bruno Haible <bruno@clisp.org>
parents:
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6 the Free Software Foundation; either version 3 of the License, or |
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Bruno Haible <bruno@clisp.org>
parents:
9029
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7 (at your option) any later version. |
| 8371 | 8 |
| 9 This program is distributed in the hope that it will be useful, | |
| 10 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 12 GNU General Public License for more details. | |
| 13 | |
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Bruno Haible <bruno@clisp.org>
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14 You should have received a copy of the GNU General Public License |
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15 along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 8371 | 16 |
| 17 #ifdef HAVE_CONFIG_H | |
| 18 # include <config.h> | |
| 19 #endif | |
| 20 | |
| 21 /* Specification. */ | |
| 22 #include <stdio.h> | |
| 23 | |
| 24 #include <errno.h> | |
| 25 #include <limits.h> | |
| 26 #include <stdarg.h> | |
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27 #include <stdint.h> |
| 8371 | 28 #include <stdlib.h> |
| 29 | |
| 30 #include "vasnprintf.h" | |
| 31 | |
| 32 #ifndef SIZE_MAX | |
| 33 # define SIZE_MAX ((size_t) -1) | |
| 34 #endif | |
| 35 | |
| 36 /* Print formatted output to string STR. | |
| 37 Return string length of formatted string. On error, return a negative | |
| 8381 | 38 value. */ |
| 8371 | 39 int |
| 40 vsprintf (char *str, const char *format, va_list args) | |
| 41 { | |
| 42 char *output; | |
| 43 size_t len; | |
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parents:
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44 size_t lenbuf; |
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Bruno Haible <bruno@clisp.org>
parents:
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45 |
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Fix endless loop when the given allocated size was > INT_MAX.
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46 /* vasnprintf fails with EOVERFLOW when the buffer size argument is larger |
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Bruno Haible <bruno@clisp.org>
parents:
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47 than INT_MAX (if that fits into a 'size_t' at all). |
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Bruno Haible <bruno@clisp.org>
parents:
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48 Also note that glibc's iconv fails with E2BIG when we pass a length that |
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Bruno Haible <bruno@clisp.org>
parents:
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49 is so large that str + lenbuf wraps around, i.e. |
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3b5cd6b6e134
Avoid address wraparound inside system functions.
Bruno Haible <bruno@clisp.org>
parents:
8468
diff
changeset
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50 (uintptr_t) (str + lenbuf) < (uintptr_t) str. |
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Bruno Haible <bruno@clisp.org>
parents:
8468
diff
changeset
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51 Therefore set lenbuf = min (SIZE_MAX, INT_MAX, - (uintptr_t) str - 1). */ |
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Avoid address wraparound inside system functions.
Bruno Haible <bruno@clisp.org>
parents:
8468
diff
changeset
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52 lenbuf = (SIZE_MAX < INT_MAX ? SIZE_MAX : INT_MAX); |
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Avoid address wraparound inside system functions.
Bruno Haible <bruno@clisp.org>
parents:
8468
diff
changeset
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53 if (lenbuf > ~ (uintptr_t) str) |
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Avoid address wraparound inside system functions.
Bruno Haible <bruno@clisp.org>
parents:
8468
diff
changeset
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54 lenbuf = ~ (uintptr_t) str; |
| 8371 | 55 |
| 56 output = vasnprintf (str, &lenbuf, format, args); | |
| 57 len = lenbuf; | |
| 58 | |
| 59 if (!output) | |
| 60 return -1; | |
| 61 | |
| 62 if (output != str) | |
| 63 { | |
| 64 /* len is near SIZE_MAX. */ | |
| 65 free (output); | |
| 66 errno = EOVERFLOW; | |
| 67 return -1; | |
| 68 } | |
| 69 | |
| 70 if (len > INT_MAX) | |
| 71 { | |
| 72 errno = EOVERFLOW; | |
| 73 return -1; | |
| 74 } | |
| 75 | |
| 76 return len; | |
| 77 } |