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annotate lib/obstack_printf.c @ 14379:2330aac2ae54

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maint: adjust cpp indentation to reflect nesting depth I.e., in a block of code that begins with an unnested "#if", put one space between the "#" in column 1 and following token. For example, -#include <sys/vfs.h> +# include <sys/vfs.h> Do this only in .c files that are part of a module I maintain. * lib/linkat.c: Filter through cppi. * lib/nanosleep.c: Likewise. * lib/openat.c: Likewise. * lib/openat-die.c: Likewise. * lib/dup3.c: Likewise. * lib/fchownat.c: Likewise. * lib/flock.c: Likewise. * lib/fsync.c: Likewise. * lib/fts.c: Likewise. * lib/getpass.c: Likewise. * lib/gettimeofday.c: Likewise. * lib/userspec.c: Likewise. * Makefile (sc_cpp_indent_check): New rule, to check this.
author Jim Meyering <meyering@redhat.com>
date Sun, 20 Feb 2011 23:02:43 +0100
parents 97fc9a21a8fb
children 8250f2777afc
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1 /* Formatted output to obstacks.
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2 Copyright (C) 2008-2011 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 2, or (at your option)
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7 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 along
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15 with this program; if not, write to the Free Software Foundation,
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16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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17
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18 #include <config.h>
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19
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20 /* Specification. */
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21 #include <stdio.h>
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22
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23 #include "obstack.h"
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24 #include "vasnprintf.h"
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25
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26 #include <errno.h>
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27 #include <stdarg.h>
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28 #include <stdlib.h>
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29
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30 /* Grow an obstack with formatted output. Return the number of bytes
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31 added to OBS. No trailing nul byte is added, and the object should
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32 be closed with obstack_finish before use.
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33
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34 Upon memory allocation error, call obstack_alloc_failed_handler.
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35 Upon other error, return -1. */
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36 int
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37 obstack_printf (struct obstack *obs, const char *format, ...)
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38 {
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39 va_list args;
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40 int result;
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41
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42 va_start (args, format);
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43 result = obstack_vprintf (obs, format, args);
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44 va_end (args);
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45 return result;
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46 }
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47
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48 /* Grow an obstack with formatted output. Return the number of bytes
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49 added to OBS. No trailing nul byte is added, and the object should
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50 be closed with obstack_finish before use.
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51
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52 Upon memory allocation error, call obstack_alloc_failed_handler.
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53 Upon other error, return -1. */
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54 int
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55 obstack_vprintf (struct obstack *obs, const char *format, va_list args)
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56 {
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57 /* If we are close to the end of the current obstack chunk, use a
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58 stack-allocated buffer and copy, to reduce the likelihood of a
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59 small-size malloc. Otherwise, print directly into the
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60 obstack. */
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61 enum { CUTOFF = 1024 };
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62 char buf[CUTOFF];
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63 char *base = obstack_next_free (obs);
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64 size_t len = obstack_room (obs);
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65 char *str;
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66
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67 if (len < CUTOFF)
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68 {
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69 base = buf;
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70 len = CUTOFF;
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71 }
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72 str = vasnprintf (base, &len, format, args);
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73 if (!str)
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74 {
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75 if (errno == ENOMEM)
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76 obstack_alloc_failed_handler ();
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77 return -1;
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78 }
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79 if (str == base && str != buf)
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80 /* The output was already computed in place, but we need to
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81 account for its size. */
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82 obstack_blank_fast (obs, len);
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83 else
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84 {
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85 /* The output exceeded available obstack space or we used buf;
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86 copy the resulting string. */
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87 obstack_grow (obs, str, len);
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88 if (str != buf)
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89 free (str);
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90 }
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91 return len;
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92 }