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80 lines
2.1 KiB
80 lines
2.1 KiB
/* Formatted output to strings. |
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Copyright (C) 2004, 2006-2012 Free Software Foundation, Inc. |
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This program is free software: you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 3 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
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#if 1 |
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# include <config.h> |
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#endif |
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/* Specification. */ |
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#include <stdio.h> |
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#include <errno.h> |
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#include <limits.h> |
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#include <stdarg.h> |
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#include <stdint.h> |
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#include <stdlib.h> |
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#include "vasnprintf.h" |
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#ifndef SIZE_MAX |
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# define SIZE_MAX ((size_t) -1) |
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#endif |
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/* Print formatted output to string STR. |
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Return string length of formatted string. On error, return a negative |
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value. */ |
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int |
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sprintf (char *str, const char *format, ...) |
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{ |
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char *output; |
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size_t len; |
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size_t lenbuf; |
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va_list args; |
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/* vasnprintf fails with EOVERFLOW when the buffer size argument is larger |
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than INT_MAX (if that fits into a 'size_t' at all). |
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Also note that glibc's iconv fails with E2BIG when we pass a length that |
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is so large that str + lenbuf wraps around, i.e. |
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(uintptr_t) (str + lenbuf) < (uintptr_t) str. |
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Therefore set lenbuf = min (SIZE_MAX, INT_MAX, - (uintptr_t) str - 1). */ |
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lenbuf = (SIZE_MAX < INT_MAX ? SIZE_MAX : INT_MAX); |
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if (lenbuf > ~ (uintptr_t) str) |
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lenbuf = ~ (uintptr_t) str; |
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va_start (args, format); |
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output = vasnprintf (str, &lenbuf, format, args); |
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len = lenbuf; |
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va_end (args); |
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if (!output) |
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return -1; |
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if (output != str) |
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{ |
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/* len is near SIZE_MAX. */ |
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free (output); |
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errno = EOVERFLOW; |
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return -1; |
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} |
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if (len > INT_MAX) |
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{ |
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errno = EOVERFLOW; |
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return -1; |
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} |
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return len; |
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}
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