libiberty/vasprintf.c

   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 #ifdef __STDC__
  22 #include <stdarg.h>
  23 #else
  24 #include <varargs.h>
  25 #endif
  26 #include <stdio.h>
  27 #include <string.h>
  28 #include <ansidecl.h>
  29
  30 #ifdef TEST
  31 int global_total_width;
  32 #endif
  33
  34 unsigned long strtoul ();
  35 char *malloc ();
  36
  37 static int
  38 int_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 and floats.  */
  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               /* Since an ieee double can have an exponent of 307, we'll
  97                  make the buffer wide enough to cover the gross case. */
  98               total_width += 307;
  99               break;
 100             case 's':
 101               total_width += strlen (va_arg (ap, char *));
 102               break;
 103             case 'p':
 104             case 'n':
 105               (void) va_arg (ap, char *);
 106               break;
 107             }
 108         }
 109     }
 110 #ifdef TEST
 111   global_total_width = total_width;
 112 #endif
 113   *result = malloc (total_width);
 114   if (*result != NULL)
 115     return vsprintf (*result, format, *args);
 116   else
 117     return 0;
 118 }
 119
 120 int
 121 vasprintf (result, format, args)
 122      char **result;
 123      const char *format;
 124 #if defined (_BSD_VA_LIST_) && defined (__FreeBSD__)
 125      _BSD_VA_LIST_ args;
 126 #else
 127      va_list args;
 128 #endif
 129 {
 130   return int_vasprintf (result, format, &args);
 131 }
 132
 133 #ifdef TEST
 134 void
 135 checkit
 136 #ifdef __STDC__
 137      (const char* format, ...)
 138 #else
 139      (va_alist)
 140      va_dcl
 141 #endif
 142 {
 143   va_list args;
 144   char *result;
 145
 146 #ifdef __STDC__
 147   va_start (args, format);
 148 #else
 149   char *format;
 150   va_start (args);
 151   format = va_arg (args, char *);
 152 #endif
 153   vasprintf (&result, format, args);
 154   if (strlen (result) < global_total_width)
 155     printf ("PASS: ");
 156   else
 157     printf ("FAIL: ");
 158   printf ("%d %s\n", global_total_width, result);
 159 }
 160
 161 int
 162 main ()
 163 {
 164   checkit ("%d", 0x12345678);
 165   checkit ("%200d", 5);
 166   checkit ("%.300d", 6);
 167   checkit ("%100.150d", 7);
 168   checkit ("%s", "jjjjjjjjjiiiiiiiiiiiiiiioooooooooooooooooppppppppppppaa\n\
 169 777777777777777777333333333333366666666666622222222222777777777777733333");
 170   checkit ("%f%s%d%s", 1.0, "foo", 77, "asdjffffffffffffffiiiiiiiiiiixxxxx");
 171 }
 172 #endif /* TEST */