Ying Wang | 0543663 | 2013-04-05 16:01:00 -0700 | [diff] [blame] | 1 | /* Formatted output to a stream. |
| 2 | Copyright (C) 2004, 2006-2012 Free Software Foundation, Inc. |
| 3 | |
| 4 | This program is free software: you can redistribute it and/or modify |
| 5 | it under the terms of the GNU General Public License as published by |
| 6 | the Free Software Foundation; either version 3 of the License, or |
| 7 | (at your option) any later version. |
| 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 | |
| 14 | You should have received a copy of the GNU General Public License |
| 15 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 16 | |
| 17 | #if 1 |
| 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> |
| 27 | #include <stdlib.h> |
| 28 | |
| 29 | #include "fseterr.h" |
| 30 | #include "vasnprintf.h" |
| 31 | |
| 32 | /* Print formatted output to the stream FP. |
| 33 | Return string length of formatted string. On error, return a negative |
| 34 | value. */ |
| 35 | int |
| 36 | fprintf (FILE *fp, const char *format, ...) |
| 37 | { |
| 38 | char buf[2000]; |
| 39 | char *output; |
| 40 | size_t len; |
| 41 | size_t lenbuf = sizeof (buf); |
| 42 | va_list args; |
| 43 | |
| 44 | va_start (args, format); |
| 45 | output = vasnprintf (buf, &lenbuf, format, args); |
| 46 | len = lenbuf; |
| 47 | va_end (args); |
| 48 | |
| 49 | if (!output) |
| 50 | { |
| 51 | fseterr (fp); |
| 52 | return -1; |
| 53 | } |
| 54 | |
| 55 | if (fwrite (output, 1, len, fp) < len) |
| 56 | { |
| 57 | if (output != buf) |
| 58 | { |
| 59 | int saved_errno = errno; |
| 60 | free (output); |
| 61 | errno = saved_errno; |
| 62 | } |
| 63 | return -1; |
| 64 | } |
| 65 | |
| 66 | if (output != buf) |
| 67 | free (output); |
| 68 | |
| 69 | if (len > INT_MAX) |
| 70 | { |
| 71 | errno = EOVERFLOW; |
| 72 | fseterr (fp); |
| 73 | return -1; |
| 74 | } |
| 75 | |
| 76 | return len; |
| 77 | } |