File: vasprintf.c

package info (click to toggle)
yafc 1.1.1.dfsg.1-4
  • links: PTS
  • area: main
  • in suites: squeeze
  • size: 3,248 kB
  • ctags: 1,679
  • sloc: ansic: 19,338; sh: 10,365; makefile: 155; perl: 38; ruby: 33
file content (193 lines) | stat: -rw-r--r-- 3,953 bytes parent folder | download | duplicates (12)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
/* Like vsprintf but provides a pointer to malloc'd storage, which must
   be freed by the caller.
   Copyright (C) 1994 Free Software Foundation, Inc.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include <stdio.h>
#include <string.h>

#if __STDC__
# include <stdarg.h>
#else
# include <varargs.h>
#endif

#ifdef TEST
int global_total_width;
#endif

unsigned long strtoul ();
char *malloc ();

static int
int_vasprintf (result, format, args)
     char **result;
     const char *format;
     va_list *args;
{
  const char *p = format;
  /* Add one to make sure that it is never zero, which might cause malloc
     to return NULL.  */
  int total_width = strlen (format) + 1;
  va_list ap;

  memcpy (&ap, args, sizeof (va_list));

  while (*p != '\0')
    {
      if (*p++ == '%')
	{
	  while (strchr ("-+ #0", *p))
	    ++p;
	  if (*p == '*')
	    {
	      ++p;
	      total_width += abs (va_arg (ap, int));
	    }
	  else
	    total_width += strtoul (p, &p, 10);
	  if (*p == '.')
	    {
	      ++p;
	      if (*p == '*')
		{
		  ++p;
		  total_width += abs (va_arg (ap, int));
		}
	      else
		total_width += strtoul (p, &p, 10);
	    }
	  while (strchr ("hlL", *p))
	    ++p;
	  /* Should be big enough for any format specifier except %s.  */
	  total_width += 30;
	  switch (*p)
	    {
	    case 'd':
	    case 'i':
	    case 'o':
	    case 'u':
	    case 'x':
	    case 'X':
	    case 'c':
	      (void) va_arg (ap, int);
	      break;
	    case 'f':
	    case 'e':
	    case 'E':
	    case 'g':
	    case 'G':
	      (void) va_arg (ap, double);
	      break;
	    case 's':
	      total_width += strlen (va_arg (ap, char *));
	      break;
	    case 'p':
	    case 'n':
	      (void) va_arg (ap, char *);
	      break;
	    }
	}
    }
#ifdef TEST
  global_total_width = total_width;
#endif
  *result = malloc (total_width);
  if (*result != NULL)
    return vsprintf (*result, format, *args);
  else
    return 0;
}

int
vasprintf (result, format, args)
     char **result;
     const char *format;
     va_list args;
{
  return int_vasprintf (result, format, &args);
}

int
asprintf
#if __STDC__
     (char **result, const char *format, ...)
#else
     (result, va_alist)
     char **result;
     va_dcl
#endif
{
  va_list args;
  int done;

#if __STDC__
  va_start (args, format);
#else
  char *format;
  va_start (args);
  format = va_arg (args, char *);
#endif
  done = vasprintf (result, format, args);
  va_end (args);

  return done;
} 

#ifdef TEST
void
checkit
#if __STDC__
     (const char* format, ...)
#else
     (va_alist)
     va_dcl
#endif
{
  va_list args;
  char *result;

#if __STDC__
  va_start (args, format);
#else
  char *format;
  va_start (args);
  format = va_arg (args, char *);
#endif
  vasprintf (&result, format, args);
  if (strlen (result) < global_total_width)
    printf ("PASS: ");
  else
    printf ("FAIL: ");
  printf ("%d %s\n", global_total_width, result);
}

int
main ()
{
  checkit ("%d", 0x12345678);
  checkit ("%200d", 5);
  checkit ("%.300d", 6);
  checkit ("%100.150d", 7);
  checkit ("%s", "jjjjjjjjjiiiiiiiiiiiiiiioooooooooooooooooppppppppppppaa\n\
777777777777777777333333333333366666666666622222222222777777777777733333");
  checkit ("%f%s%d%s", 1.0, "foo", 77, "asdjffffffffffffffiiiiiiiiiiixxxxx");
}
#endif /* TEST */