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annotate lib/c-snprintf.c @ 17480:f40b3156a43e

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selinux-at: omit unnecessary include * lib/selinux-at.c: Don't include dosname.h; not needed, since this source file doesn't use its macros, and subsidiary files that use the macros already include it.
author Paul Eggert <eggert@cs.ucla.edu>
date Fri, 23 Aug 2013 13:53:46 -0700
parents e542fd46ad6f
children 344018b6e5d7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* Formatted output to strings in C locale.
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e542fd46ad6f maint: update all copyright year number ranges
Eric Blake <eblake@redhat.com>
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2 Copyright (C) 2004, 2006-2013 Free Software Foundation, Inc.
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3 Written by Simon Josefsson and Paul Eggert.
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4 Modified for C locale by Ben Pfaff.
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5
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6 This program is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 3, or (at your option)
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9 any later version.
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10
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11 This program is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 You should have received a copy of the GNU General Public License along
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17 with this program; if not, see <http://www.gnu.org/licenses/>. */
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18
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19 #include <config.h>
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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 #include <string.h>
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29
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30 #include "c-vasnprintf.h"
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31
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32 /* Print formatted output to string STR. Similar to sprintf, but
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33 additional length SIZE limit how much is written into STR. Returns
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34 string length of formatted string (which may be larger than SIZE).
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35 STR may be NULL, in which case nothing will be written. On error,
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36 return a negative value.
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37
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38 Formatting takes place in the C locale, that is, the decimal point
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39 used in floating-point formatting directives is always '.'. */
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40 int
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41 c_snprintf (char *str, size_t size, const char *format, ...)
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42 {
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43 char *output;
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44 size_t len;
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45 size_t lenbuf = size;
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46 va_list args;
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47
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48 va_start (args, format);
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49 output = c_vasnprintf (str, &lenbuf, format, args);
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50 len = lenbuf;
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51 va_end (args);
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52
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53 if (!output)
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54 return -1;
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55
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56 if (output != str)
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57 {
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58 if (size)
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59 {
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60 size_t pruned_len = (len < size ? len : size - 1);
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61 memcpy (str, output, pruned_len);
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62 str[pruned_len] = '\0';
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63 }
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64
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65 free (output);
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66 }
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67
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68 if (INT_MAX < len)
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69 {
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70 errno = EOVERFLOW;
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71 return -1;
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72 }
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73
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74 return len;
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75 }