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 HAVE_CONFIG_H
  22 #include "config.h"
  23 #endif
  24 #include <ansidecl.h>
  25 #ifdef ANSI_PROTOTYPES
  26 #include <stdarg.h>
  27 #else
  28 #include <varargs.h>
  29 #endif
  30 #include <stdio.h>
  31 #include <string.h>
  32 #ifdef HAVE_STDLIB_H
  33 #include <stdlib.h>
  34 #else
  35 extern unsigned long strtoul ();
  36 extern PTR malloc ();
  37 #endif
  38 #include "libiberty.h"
  39
  40 #ifdef TEST
  41 int global_total_width;
  42 #endif
  43
  44
  45 static int int_vasprintf PARAMS ((char **, const char *, va_list *));
  46
  47 static int
  48 int_vasprintf (result, format, args)
  49      char **result;
  50      const char *format;
  51      va_list *args;
  52 {
  53   const char *p = format;
  54   /* Add one to make sure that it is never zero, which might cause malloc
  55      to return NULL.  */
  56   int total_width = strlen (format) + 1;
  57   va_list ap;
  58
  59   memcpy ((PTR) &ap, (PTR) args, sizeof (va_list));
  60
  61   while (*p != '\0')
  62     {
  63       if (*p++ == '%')
  64         {
  65           while (strchr ("-+ #0", *p))
  66             ++p;
  67           if (*p == '*')
  68             {
  69               ++p;
  70               total_width += abs (va_arg (ap, int));
  71             }
  72           else
  73             total_width += strtoul (p, (char **) &p, 10);
  74           if (*p == '.')
  75             {
  76               ++p;
  77               if (*p == '*')
  78                 {
  79                   ++p;
  80                   total_width += abs (va_arg (ap, int));
  81                 }
  82               else
  83               total_width += strtoul (p, (char **) &p, 10);
  84             }
  85           while (strchr ("hlL", *p))
  86             ++p;
  87           /* Should be big enough for any format specifier except %s and floats.  */
  88           total_width += 30;
  89           switch (*p)
  90             {
  91             case 'd':
  92             case 'i':
  93             case 'o':
  94             case 'u':
  95             case 'x':
  96             case 'X':
  97             case 'c':
  98               (void) va_arg (ap, int);
  99               break;
 100             case 'f':
 101             case 'e':
 102             case 'E':
 103             case 'g':
 104             case 'G':
 105               (void) va_arg (ap, double);
 106               /* Since an ieee double can have an exponent of 307, we'll
 107                  make the buffer wide enough to cover the gross case. */
 108               total_width += 307;
 109               break;
 110             case 's':
 111               total_width += strlen (va_arg (ap, char *));
 112               break;
 113             case 'p':
 114             case 'n':
 115               (void) va_arg (ap, char *);
 116               break;
 117             }
 118           p++;
 119         }
 120     }
 121 #ifdef TEST
 122   global_total_width = total_width;
 123 #endif
 124   *result = malloc (total_width);
 125   if (*result != NULL)
 126     return vsprintf (*result, format, *args);
 127   else
 128     return 0;
 129 }
 130
 131 int
 132 vasprintf (result, format, args)
 133      char **result;
 134      const char *format;
 135 #if defined (_BSD_VA_LIST_) && defined (__FreeBSD__)
 136      _BSD_VA_LIST_ args;
 137 #else
 138      va_list args;
 139 #endif
 140 {
 141   return int_vasprintf (result, format, &args);
 142 }
 143
 144 #ifdef TEST
 145 static void checkit PARAMS ((const char *, ...));
 146
 147 static void
 148 checkit VPARAMS ((const char* format, ...))
 149 {
 150   va_list args;
 151   char *result;
 152 #ifndef ANSI_PROTOTYPES
 153   const char *format;
 154 #endif
 155
 156   VA_START (args, format);
 157
 158 #ifndef ANSI_PROTOTYPES
 159   format = va_arg (args, const char *);
 160 #endif
 161
 162   vasprintf (&result, format, args);
 163   if (strlen (result) < (size_t) global_total_width)
 164     printf ("PASS: ");
 165   else
 166     printf ("FAIL: ");
 167   printf ("%d %s\n", global_total_width, result);
 168 }
 169
 170 extern int main PARAMS ((void));
 171
 172 int
 173 main ()
 174 {
 175   checkit ("%d", 0x12345678);
 176   checkit ("%200d", 5);
 177   checkit ("%.300d", 6);
 178   checkit ("%100.150d", 7);
 179   checkit ("%s", "jjjjjjjjjiiiiiiiiiiiiiiioooooooooooooooooppppppppppppaa\n\
 180 777777777777777777333333333333366666666666622222222222777777777777733333");
 181   checkit ("%f%s%d%s", 1.0, "foo", 77, "asdjffffffffffffffiiiiiiiiiiixxxxx");
 182
 183   return 0;
 184 }
 185 #endif /* TEST */