Mercurial > hg > octave-nkf > gnulib-hg
annotate lib/sprintf.c @ 9928:9a02133ad731
Add tentative support for Linux libc5.
| author | Bruno Haible <bruno@clisp.org> |
|---|---|
| date | Thu, 17 Apr 2008 02:01:23 +0200 |
| parents | 787bf3487678 |
| children | b5e42ef33b49 |
| rev | line source |
|---|---|
| 8373 | 1 /* Formatted output to strings. |
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9831
787bf3487678
Use module 'EOVERFLOW' rather than defining an EOVERFLOW replacement in the C
Bruno Haible <bruno@clisp.org>
parents:
9309
diff
changeset
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2 Copyright (C) 2004, 2006-2008 Free Software Foundation, Inc. |
| 8373 | 3 |
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Change copyright notice from GPLv2+ to GPLv3+.
Bruno Haible <bruno@clisp.org>
parents:
9029
diff
changeset
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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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bbbbbf4cd1c5
Change copyright notice from GPLv2+ to GPLv3+.
Bruno Haible <bruno@clisp.org>
parents:
9029
diff
changeset
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6 the Free Software Foundation; either version 3 of the License, or |
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bbbbbf4cd1c5
Change copyright notice from GPLv2+ to GPLv3+.
Bruno Haible <bruno@clisp.org>
parents:
9029
diff
changeset
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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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Change copyright notice from GPLv2+ to GPLv3+.
Bruno Haible <bruno@clisp.org>
parents:
9029
diff
changeset
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14 You should have received a copy of the GNU General Public License |
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bbbbbf4cd1c5
Change copyright notice from GPLv2+ to GPLv3+.
Bruno Haible <bruno@clisp.org>
parents:
9029
diff
changeset
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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> | |
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Avoid address wraparound inside system functions.
Bruno Haible <bruno@clisp.org>
parents:
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diff
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27 #include <stdint.h> |
| 8373 | 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. */ |
| 8373 | 39 int |
| 40 sprintf (char *str, const char *format, ...) | |
| 41 { | |
| 42 char *output; | |
| 43 size_t len; | |
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Avoid address wraparound inside system functions.
Bruno Haible <bruno@clisp.org>
parents:
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diff
changeset
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44 size_t lenbuf; |
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3b5cd6b6e134
Avoid address wraparound inside system functions.
Bruno Haible <bruno@clisp.org>
parents:
8468
diff
changeset
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45 va_list args; |
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3b5cd6b6e134
Avoid address wraparound inside system functions.
Bruno Haible <bruno@clisp.org>
parents:
8468
diff
changeset
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46 |
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336e69863755
Fix endless loop when the given allocated size was > INT_MAX.
Bruno Haible <bruno@clisp.org>
parents:
8381
diff
changeset
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47 /* 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
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48 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
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49 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
|
50 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
|
51 (uintptr_t) (str + lenbuf) < (uintptr_t) str. |
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3b5cd6b6e134
Avoid address wraparound inside system functions.
Bruno Haible <bruno@clisp.org>
parents:
8468
diff
changeset
|
52 Therefore set lenbuf = min (SIZE_MAX, INT_MAX, - (uintptr_t) str - 1). */ |
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3b5cd6b6e134
Avoid address wraparound inside system functions.
Bruno Haible <bruno@clisp.org>
parents:
8468
diff
changeset
|
53 lenbuf = (SIZE_MAX < INT_MAX ? SIZE_MAX : INT_MAX); |
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3b5cd6b6e134
Avoid address wraparound inside system functions.
Bruno Haible <bruno@clisp.org>
parents:
8468
diff
changeset
|
54 if (lenbuf > ~ (uintptr_t) str) |
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3b5cd6b6e134
Avoid address wraparound inside system functions.
Bruno Haible <bruno@clisp.org>
parents:
8468
diff
changeset
|
55 lenbuf = ~ (uintptr_t) str; |
| 8373 | 56 |
| 57 va_start (args, format); | |
| 58 output = vasnprintf (str, &lenbuf, format, args); | |
| 59 len = lenbuf; | |
| 60 va_end (args); | |
| 61 | |
| 62 if (!output) | |
| 63 return -1; | |
| 64 | |
| 65 if (output != str) | |
| 66 { | |
| 67 /* len is near SIZE_MAX. */ | |
| 68 free (output); | |
| 69 errno = EOVERFLOW; | |
| 70 return -1; | |
| 71 } | |
| 72 | |
| 73 if (len > INT_MAX) | |
| 74 { | |
| 75 errno = EOVERFLOW; | |
| 76 return -1; | |
| 77 } | |
| 78 | |
| 79 return len; | |
| 80 } |