vasprintf.c revision 33965 
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
5This file is part of the libiberty library.
6Libiberty is free software; you can redistribute it and/or
7modify it under the terms of the GNU Library General Public
8License as published by the Free Software Foundation; either
9version 2 of the License, or (at your option) any later version.
10
11Libiberty is distributed in the hope that it will be useful,
12but WITHOUT ANY WARRANTY; without even the implied warranty of
13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14Library General Public License for more details.
15
16You should have received a copy of the GNU Library General Public
17License along with libiberty; see the file COPYING.LIB.  If
18not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19Boston, MA 02111-1307, USA.  */
20
21#include <stdio.h>
22#include <string.h>
23#include <ansidecl.h>
24#ifdef __STDC__
25#include <stdarg.h>
26#else
27#include <varargs.h>
28#endif
29
30#ifdef TEST
31int global_total_width;
32#endif
33
34unsigned long strtoul ();
35char *malloc ();
36
37static int
38int_vasprintf (result, format, args)
39     char **result;
40     const char *format;
41     va_list *args;
42{
43  const char *p = format;
44  /* Add one to make sure that it is never zero, which might cause malloc
45     to return NULL.  */
46  int total_width = strlen (format) + 1;
47  va_list ap;
48
49  memcpy ((PTR) &ap, (PTR) args, sizeof (va_list));
50
51  while (*p != '\0')
52    {
53      if (*p++ == '%')
54	{
55	  while (strchr ("-+ #0", *p))
56	    ++p;
57	  if (*p == '*')
58	    {
59	      ++p;
60	      total_width += abs (va_arg (ap, int));
61	    }
62	  else
63	    total_width += strtoul (p, &p, 10);
64	  if (*p == '.')
65	    {
66	      ++p;
67	      if (*p == '*')
68		{
69		  ++p;
70		  total_width += abs (va_arg (ap, int));
71		}
72	      else
73	      total_width += strtoul (p, &p, 10);
74	    }
75	  while (strchr ("hlL", *p))
76	    ++p;
77	  /* Should be big enough for any format specifier except %s.  */
78	  total_width += 30;
79	  switch (*p)
80	    {
81	    case 'd':
82	    case 'i':
83	    case 'o':
84	    case 'u':
85	    case 'x':
86	    case 'X':
87	    case 'c':
88	      (void) va_arg (ap, int);
89	      break;
90	    case 'f':
91	    case 'e':
92	    case 'E':
93	    case 'g':
94	    case 'G':
95	      (void) va_arg (ap, double);
96	      break;
97	    case 's':
98	      total_width += strlen (va_arg (ap, char *));
99	      break;
100	    case 'p':
101	    case 'n':
102	      (void) va_arg (ap, char *);
103	      break;
104	    }
105	}
106    }
107#ifdef TEST
108  global_total_width = total_width;
109#endif
110  *result = malloc (total_width);
111  if (*result != NULL)
112    return vsprintf (*result, format, *args);
113  else
114    return 0;
115}
116
117int
118vasprintf (result, format, args)
119     char **result;
120     const char *format;
121     va_list args;
122{
123  return int_vasprintf (result, format, &args);
124}
125
126#ifdef TEST
127void
128checkit
129#ifdef __STDC__
130     (const char* format, ...)
131#else
132     (va_alist)
133     va_dcl
134#endif
135{
136  va_list args;
137  char *result;
138
139#ifdef __STDC__
140  va_start (args, format);
141#else
142  char *format;
143  va_start (args);
144  format = va_arg (args, char *);
145#endif
146  vasprintf (&result, format, args);
147  if (strlen (result) < global_total_width)
148    printf ("PASS: ");
149  else
150    printf ("FAIL: ");
151  printf ("%d %s\n", global_total_width, result);
152}
153
154int
155main ()
156{
157  checkit ("%d", 0x12345678);
158  checkit ("%200d", 5);
159  checkit ("%.300d", 6);
160  checkit ("%100.150d", 7);
161  checkit ("%s", "jjjjjjjjjiiiiiiiiiiiiiiioooooooooooooooooppppppppppppaa\n\
162777777777777777777333333333333366666666666622222222222777777777777733333");
163  checkit ("%f%s%d%s", 1.0, "foo", 77, "asdjffffffffffffffiiiiiiiiiiixxxxx");
164}
165#endif /* TEST */
166