1 /* Like vsprintf but provides a pointer to malloc'd storage, which must
2 be freed by the caller.
3 Copyright (C) 1994 Free Software Foundation, Inc.
4
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.
10
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.
15
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. */
20
21 #include "config.h"
22 #include <stdio.h>
23 #include <string.h>
24 #include <stdlib.h>
25 #include <ansidecl.h>
26 #ifdef __STDC__
27 #include <stdarg.h>
28 #else
29 #include <varargs.h>
30 #endif
31
32 #ifdef TEST
33 int global_total_width;
34 #endif
35
36 #ifndef HAVE_VASPRINTF
37
38 static int
int_vasprintf(char ** result,const char * format,va_list * args)39 int_vasprintf (char **result, const char *format, va_list *args)
40 {
41 const char *p = format;
42 /* Add one to make sure that it is never zero, which might cause malloc
43 to return NULL. */
44 int total_width = strlen (format) + 1;
45 va_list ap;
46
47 memcpy ((PTR) &ap, (PTR) args, sizeof (va_list));
48
49 while (*p != '\0')
50 {
51 if (*p++ == '%')
52 {
53 while (strchr ("-+ #0", *p))
54 ++p;
55 if (*p == '*')
56 {
57 ++p;
58 total_width += abs (va_arg (ap, int));
59 }
60 else
61 total_width += strtoul (p, (char **)&p, 10);
62 if (*p == '.')
63 {
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 }
73 while (strchr ("hlL", *p))
74 ++p;
75 /* Should be big enough for any format specifier except %s and floats. */
76 total_width += 30;
77 switch (*p)
78 {
79 case 'd':
80 case 'i':
81 case 'o':
82 case 'u':
83 case 'x':
84 case 'X':
85 case 'c':
86 (void) va_arg (ap, int);
87 break;
88 case 'f':
89 case 'e':
90 case 'E':
91 case 'g':
92 case 'G':
93 (void) va_arg (ap, double);
94 /* Since an ieee double can have an exponent of 307, we'll
95 make the buffer wide enough to cover the gross case. */
96 total_width += 307;
97 break;
98 case 's':
99 total_width += strlen (va_arg (ap, char *));
100 break;
101 case 'p':
102 case 'n':
103 (void) va_arg (ap, char *);
104 break;
105 }
106 }
107 }
108 #ifdef TEST
109 global_total_width = total_width;
110 #endif
111 *result = malloc (total_width);
112 if (*result != NULL)
113 return vsprintf (*result, format, *args);
114 else
115 return 0;
116 }
117
118 int
vasprintf(char ** result,const char * format,va_list args)119 vasprintf (char **result, const char *format, va_list args)
120 {
121 return int_vasprintf (result, format, &args);
122 }
123
124 #else
125 extern int _I_dont_care_that_ISO_C_forbids_an_empty_source_file_;
126 #endif
127
128 #ifdef TEST
129 void
checkit(const char * format,...)130 checkit
131 #ifdef __STDC__
132 (const char* format, ...)
133 #else
134 (va_alist)
135 va_dcl
136 #endif
137 {
138 va_list args;
139 char *result;
140 int ret;
141
142 #ifdef __STDC__
143 va_start (args, format);
144 #else
145 char *format;
146 va_start (args);
147 format = va_arg (args, char *);
148 #endif
149 ret = vasprintf (&result, format, args);
150 if (ret >= 0 && strlen (result) < global_total_width)
151 printf ("PASS: ");
152 else
153 printf ("FAIL: ");
154 printf ("%d %s\n", global_total_width, result);
155 }
156
157 int
main()158 main ()
159 {
160 checkit ("%d", 0x12345678);
161 checkit ("%200d", 5);
162 checkit ("%.300d", 6);
163 checkit ("%100.150d", 7);
164 checkit ("%s", "jjjjjjjjjiiiiiiiiiiiiiiioooooooooooooooooppppppppppppaa\n\
165 777777777777777777333333333333366666666666622222222222777777777777733333");
166 checkit ("%f%s%d%s", 1.0, "foo", 77, "asdjffffffffffffffiiiiiiiiiiixxxxx");
167 }
168 #endif /* TEST */
169