honeyd/vasprintf.c@9fe04d4d4e5a
honeyd/vasprintf.c
Mon, 17 Sep 2012 19:10:10 +0200
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Mon, 17 Sep 2012 19:10:10 +0200
- changeset 689
- 9fe04d4d4e5a
- permissions
- -rw-r--r--
Update to new version of vendor software although Oracle fails to deliver.
More specifically, newer db(3) patch revisions exist but Oracle has
removed them from the canonical download server URI for Berkely DB.
1 /* Like vsprintf but provides a pointer to malloc'd storage, which must
2 be freed by the caller.
3 Copyright (C) 1994, 2003 Free Software Foundation, Inc.
5 This file is part of the libiberty library.
6 Libiberty is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Library General Public
8 License as published by the Free Software Foundation; either
9 version 2 of the License, or (at your option) any later version.
11 Libiberty is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Library General Public License for more details.
16 You should have received a copy of the GNU Library General Public
17 License along with libiberty; see the file COPYING.LIB. If
18 not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
21 #include <stdarg.h>
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include <string.h>
25 #include "vasprintf.h"
27 /*
29 @deftypefn Extension int vasprintf (char **@var{resptr}, const char *@var{format}, va_list @var{args})
31 Like @code{vsprintf}, but instead of passing a pointer to a buffer,
32 you pass a pointer to a pointer. This function will compute the size
33 of the buffer needed, allocate memory with @code{malloc}, and store a
34 pointer to the allocated memory in @code{*@var{resptr}}. The value
35 returned is the same as @code{vsprintf} would return. If memory could
36 not be allocated, minus one is returned and @code{NULL} is stored in
37 @code{*@var{resptr}}.
39 @end deftypefn
41 */
43 static int int_vasprintf(char **, const char *, va_list);
45 static int
46 int_vasprintf (result, format, args)
47 char **result;
48 const char *format;
49 va_list args;
50 {
51 const char *p = format;
52 /* Add one to make sure that it is never zero, which might cause malloc
53 to return NULL. */
54 int total_width = strlen (format) + 1;
55 va_list ap;
57 memcpy ((void *) &ap, (const void *) &args, sizeof (va_list));
59 while (*p != '\0')
60 {
61 if (*p++ == '%')
62 {
63 while (strchr ("-+ #0", *p))
64 ++p;
65 if (*p == '*')
66 {
67 ++p;
68 total_width += abs (va_arg (ap, int));
69 }
70 else
71 total_width += strtoul (p, (char **) &p, 10);
72 if (*p == '.')
73 {
74 ++p;
75 if (*p == '*')
76 {
77 ++p;
78 total_width += abs (va_arg (ap, int));
79 }
80 else
81 total_width += strtoul (p, (char **) &p, 10);
82 }
83 while (strchr ("hlL", *p))
84 ++p;
85 /* Should be big enough for any format specifier except %s and floats. */
86 total_width += 30;
87 switch (*p)
88 {
89 case 'd':
90 case 'i':
91 case 'o':
92 case 'u':
93 case 'x':
94 case 'X':
95 case 'c':
96 (void) va_arg (ap, int);
97 break;
98 case 'f':
99 case 'e':
100 case 'E':
101 case 'g':
102 case 'G':
103 (void) va_arg (ap, double);
104 /* Since an ieee double can have an exponent of 307, we'll
105 make the buffer wide enough to cover the gross case. */
106 total_width += 307;
107 break;
108 case 's':
109 total_width += strlen (va_arg (ap, char *));
110 break;
111 case 'p':
112 case 'n':
113 (void) va_arg (ap, char *);
114 break;
115 }
116 p++;
117 }
118 }
119 *result = (char *) malloc (total_width);
120 if (*result != NULL)
121 return vsprintf (*result, format, args);
122 else
123 return -1;
124 }
126 int
127 vasprintf (result, format, args)
128 char **result;
129 const char *format;
130 va_list args;
131 {
132 return int_vasprintf (result, format, args);
133 }
