Mercurial > hg > octave-nkf > gnulib-hg
annotate lib/sprintf.c @ 9309:bbbbbf4cd1c5
Change copyright notice from GPLv2+ to GPLv3+.
| author | Bruno Haible <bruno@clisp.org> |
|---|---|
| date | Sun, 07 Oct 2007 19:14:58 +0200 |
| parents | 3b5cd6b6e134 |
| children | 787bf3487678 |
| rev | line source |
|---|---|
| 8373 | 1 /* Formatted output to strings. |
| 2 Copyright (C) 2004, 2006-2007 Free Software Foundation, Inc. | |
| 3 | |
|
9309
bbbbbf4cd1c5
Change copyright notice from GPLv2+ to GPLv3+.
Bruno Haible <bruno@clisp.org>
parents:
9029
diff
changeset
|
4 This program is free software: you can redistribute it and/or modify |
| 8373 | 5 it under the terms of the GNU General Public License as published by |
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9309
bbbbbf4cd1c5
Change copyright notice from GPLv2+ to GPLv3+.
Bruno Haible <bruno@clisp.org>
parents:
9029
diff
changeset
|
6 the Free Software Foundation; either version 3 of the License, or |
|
bbbbbf4cd1c5
Change copyright notice from GPLv2+ to GPLv3+.
Bruno Haible <bruno@clisp.org>
parents:
9029
diff
changeset
|
7 (at your option) any later version. |
| 8373 | 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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9309
bbbbbf4cd1c5
Change copyright notice from GPLv2+ to GPLv3+.
Bruno Haible <bruno@clisp.org>
parents:
9029
diff
changeset
|
14 You should have received a copy of the GNU General Public License |
|
bbbbbf4cd1c5
Change copyright notice from GPLv2+ to GPLv3+.
Bruno Haible <bruno@clisp.org>
parents:
9029
diff
changeset
|
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 8373 | 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> | |
|
9029
3b5cd6b6e134
Avoid address wraparound inside system functions.
Bruno Haible <bruno@clisp.org>
parents:
8468
diff
changeset
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27 #include <stdint.h> |
| 8373 | 28 #include <stdlib.h> |
| 29 | |
| 30 #include "vasnprintf.h" | |
| 31 | |
| 32 /* Some systems, like OSF/1 4.0 and Woe32, don't have EOVERFLOW. */ | |
| 33 #ifndef EOVERFLOW | |
| 34 # define EOVERFLOW E2BIG | |
| 35 #endif | |
| 36 | |
| 37 #ifndef SIZE_MAX | |
| 38 # define SIZE_MAX ((size_t) -1) | |
| 39 #endif | |
| 40 | |
| 41 /* Print formatted output to string STR. | |
| 42 Return string length of formatted string. On error, return a negative | |
| 8381 | 43 value. */ |
| 8373 | 44 int |
| 45 sprintf (char *str, const char *format, ...) | |
| 46 { | |
| 47 char *output; | |
| 48 size_t len; | |
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Avoid address wraparound inside system functions.
Bruno Haible <bruno@clisp.org>
parents:
8468
diff
changeset
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49 size_t lenbuf; |
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3b5cd6b6e134
Avoid address wraparound inside system functions.
Bruno Haible <bruno@clisp.org>
parents:
8468
diff
changeset
|
50 va_list args; |
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3b5cd6b6e134
Avoid address wraparound inside system functions.
Bruno Haible <bruno@clisp.org>
parents:
8468
diff
changeset
|
51 |
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8468
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Fix endless loop when the given allocated size was > INT_MAX.
Bruno Haible <bruno@clisp.org>
parents:
8381
diff
changeset
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52 /* vasnprintf fails with EOVERFLOW when the buffer size argument is larger |
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9029
3b5cd6b6e134
Avoid address wraparound inside system functions.
Bruno Haible <bruno@clisp.org>
parents:
8468
diff
changeset
|
53 than INT_MAX (if that fits into a 'size_t' at all). |
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3b5cd6b6e134
Avoid address wraparound inside system functions.
Bruno Haible <bruno@clisp.org>
parents:
8468
diff
changeset
|
54 Also note that glibc's iconv fails with E2BIG when we pass a length that |
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3b5cd6b6e134
Avoid address wraparound inside system functions.
Bruno Haible <bruno@clisp.org>
parents:
8468
diff
changeset
|
55 is so large that str + lenbuf wraps around, i.e. |
|
3b5cd6b6e134
Avoid address wraparound inside system functions.
Bruno Haible <bruno@clisp.org>
parents:
8468
diff
changeset
|
56 (uintptr_t) (str + lenbuf) < (uintptr_t) str. |
|
3b5cd6b6e134
Avoid address wraparound inside system functions.
Bruno Haible <bruno@clisp.org>
parents:
8468
diff
changeset
|
57 Therefore set lenbuf = min (SIZE_MAX, INT_MAX, - (uintptr_t) str - 1). */ |
|
3b5cd6b6e134
Avoid address wraparound inside system functions.
Bruno Haible <bruno@clisp.org>
parents:
8468
diff
changeset
|
58 lenbuf = (SIZE_MAX < INT_MAX ? SIZE_MAX : INT_MAX); |
|
3b5cd6b6e134
Avoid address wraparound inside system functions.
Bruno Haible <bruno@clisp.org>
parents:
8468
diff
changeset
|
59 if (lenbuf > ~ (uintptr_t) str) |
|
3b5cd6b6e134
Avoid address wraparound inside system functions.
Bruno Haible <bruno@clisp.org>
parents:
8468
diff
changeset
|
60 lenbuf = ~ (uintptr_t) str; |
| 8373 | 61 |
| 62 va_start (args, format); | |
| 63 output = vasnprintf (str, &lenbuf, format, args); | |
| 64 len = lenbuf; | |
| 65 va_end (args); | |
| 66 | |
| 67 if (!output) | |
| 68 return -1; | |
| 69 | |
| 70 if (output != str) | |
| 71 { | |
| 72 /* len is near SIZE_MAX. */ | |
| 73 free (output); | |
| 74 errno = EOVERFLOW; | |
| 75 return -1; | |
| 76 } | |
| 77 | |
| 78 if (len > INT_MAX) | |
| 79 { | |
| 80 errno = EOVERFLOW; | |
| 81 return -1; | |
| 82 } | |
| 83 | |
| 84 return len; | |
| 85 } |