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annotate lib/vdprintf.c @ 11033:049c445485ee

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New modules 'vdprintf', 'vdprintf-posix'.
author Bruno Haible <bruno@clisp.org>
date Sun, 18 Jan 2009 02:48:41 +0100
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children e8d2c6fc33ad
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11033
049c445485ee New modules 'vdprintf', 'vdprintf-posix'.
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1 /* Formatted output to a file descriptor.
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2 Copyright (C) 2009 Free Software Foundation, Inc.
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3
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4 This program is free software: you can redistribute it and/or modify
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 3 of the License, or
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7 (at your option) any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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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/>. */
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16
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17 #ifdef HAVE_CONFIG_H
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18 # include <config.h>
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19 #endif
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20
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21 /* Specification. */
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22 #include <stdio.h>
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23
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24 #include <errno.h>
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25 #include <limits.h>
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26 #include <stdarg.h>
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27 #include <stdlib.h>
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28
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29 #include "full-write.h"
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30 #include "vasnprintf.h"
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31
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32 int
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33 vdprintf (int fd, const char *format, va_list args)
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34 {
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35 char buf[2000];
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36 char *output;
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37 size_t len;
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38 size_t lenbuf = sizeof (buf);
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39
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40 output = vasnprintf (buf, &lenbuf, format, args);
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41 len = lenbuf;
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42
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43 if (!output)
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44 return -1;
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45
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46 if (full_write (fd, output, len) < len)
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47 {
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48 if (output != buf)
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49 {
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50 int saved_errno = errno;
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51 free (output);
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52 errno = saved_errno;
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53 }
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54 return -1;
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55 }
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56
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57 if (len > INT_MAX)
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58 {
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59 errno = EOVERFLOW;
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60 return -1;
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61 }
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62
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63 return len;
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64 }