annotate lib/vfprintf.c @ 16229:daac1ca4c436

inttypes: Modernize. * lib/inttypes.in.h (strtoimax, strtoumax): Use the C++ safe idioms. * modules/inttypes-incomplete (Depends-on): Add snippet/c++defs. (Makefile.am): Update inttypes.h rule.
author Bruno Haible <bruno@clisp.org>
date Thu, 05 Jan 2012 18:42:08 +0100
parents 8250f2777afc
children e542fd46ad6f
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1 /* Formatted output to a stream.
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2 Copyright (C) 2004, 2006-2012 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 "fseterr.h"
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30 #include "vasnprintf.h"
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31
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32 /* Print formatted output to the stream FP.
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33 Return string length of formatted string. On error, return a negative
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34 value. */
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35 int
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36 vfprintf (FILE *fp, const char *format, va_list args)
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37 {
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38 char buf[2000];
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39 char *output;
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40 size_t len;
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41 size_t lenbuf = sizeof (buf);
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42
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43 output = vasnprintf (buf, &lenbuf, format, args);
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44 len = lenbuf;
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45
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46 if (!output)
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47 {
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48 fseterr (fp);
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49 return -1;
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50 }
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51
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52 if (fwrite (output, 1, len, fp) < len)
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53 {
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54 if (output != buf)
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55 {
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56 int saved_errno = errno;
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57 free (output);
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58 errno = saved_errno;
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59 }
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60 return -1;
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61 }
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62
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63 if (output != buf)
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64 free (output);
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65
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66 if (len > INT_MAX)
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67 {
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68 errno = EOVERFLOW;
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69 fseterr (fp);
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70 return -1;
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71 }
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72
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73 return len;
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74 }