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 #ifdef HAVE_STRING_H
  32 #include <string.h>
  33 #endif
  34 #ifdef HAVE_STDLIB_H
  35 #include <stdlib.h>
  36 #else
  37 extern unsigned long strtoul ();
  38 extern PTR malloc ();
  39 #endif
  40 #include "libiberty.h"
  41
  42 #ifdef TEST
  43 int global_total_width;
  44 #endif
  45
  46
  47 static int int_vasprintf PARAMS ((char **, const char *, va_list *));
  48
  49 static int
  50 int_vasprintf (result, format, args)
  51      char **result;
  52      const char *format;
  53      va_list *args;
  54 {
  55   const char *p = format;
  56   /* Add one to make sure that it is never zero, which might cause malloc
  57      to return NULL.  */
  58   int total_width = strlen (format) + 1;
  59   va_list ap;
  60
  61   memcpy ((PTR) &ap, (PTR) args, sizeof (va_list));
  62
  63   while (*p != '\0')
  64     {
  65       if (*p++ == '%')
  66         {
  67           while (strchr ("-+ #0", *p))
  68             ++p;
  69           if (*p == '*')
  70             {
  71               ++p;
  72               total_width += abs (va_arg (ap, int));
  73             }
  74           else
  75             total_width += strtoul (p, (char **) &p, 10);
  76           if (*p == '.')
  77             {
  78               ++p;
  79               if (*p == '*')
  80                 {
  81                   ++p;
  82                   total_width += abs (va_arg (ap, int));
  83                 }
  84               else
  85               total_width += strtoul (p, (char **) &p, 10);
  86             }
  87           while (strchr ("hlL", *p))
  88             ++p;
  89           /* Should be big enough for any format specifier except %s and floats.  */
  90           total_width += 30;
  91           switch (*p)
  92             {
  93             case 'd':
  94             case 'i':
  95             case 'o':
  96             case 'u':
  97             case 'x':
  98             case 'X':
  99             case 'c':
 100               (void) va_arg (ap, int);
 101               break;
 102             case 'f':
 103             case 'e':
 104             case 'E':
 105             case 'g':
 106             case 'G':
 107               (void) va_arg (ap, double);
 108               /* Since an ieee double can have an exponent of 307, we'll
 109                  make the buffer wide enough to cover the gross case. */
 110               total_width += 307;
 111               break;
 112             case 's':
 113               total_width += strlen (va_arg (ap, char *));
 114               break;
 115             case 'p':
 116             case 'n':
 117               (void) va_arg (ap, char *);
 118               break;
 119             }
 120           p++;
 121         }
 122     }
 123 #ifdef TEST
 124   global_total_width = total_width;
 125 #endif
 126   *result = malloc (total_width);
 127   if (*result != NULL)
 128     return vsprintf (*result, format, *args);
 129   else
 130     return 0;
 131 }
 132
 133 int
 134 vasprintf (result, format, args)
 135      char **result;
 136      const char *format;
 137 #if defined (_BSD_VA_LIST_) && defined (__FreeBSD__)
 138      _BSD_VA_LIST_ args;
 139 #else
 140      va_list args;
 141 #endif
 142 {
 143   return int_vasprintf (result, format, &args);
 144 }
 145
 146 #ifdef TEST
 147 static void ATTRIBUTE_PRINTF_1
 148 checkit VPARAMS ((const char *format, ...))
 149 {
 150   char *result;
 151   VA_OPEN (args, format);
 152   VA_FIXEDARG (args, const char *, format);
 153   vasprintf (&result, format, args);
 154   VA_CLOSE (args);
 155
 156   if (strlen (result) < (size_t) global_total_width)
 157     printf ("PASS: ");
 158   else
 159     printf ("FAIL: ");
 160   printf ("%d %s\n", global_total_width, result);
 161
 162   free (result);
 163 }
 164
 165 extern int main PARAMS ((void));
 166
 167 int
 168 main ()
 169 {
 170   checkit ("%d", 0x12345678);
 171   checkit ("%200d", 5);
 172   checkit ("%.300d", 6);
 173   checkit ("%100.150d", 7);
 174   checkit ("%s", "jjjjjjjjjiiiiiiiiiiiiiiioooooooooooooooooppppppppppppaa\n\
 175 777777777777777777333333333333366666666666622222222222777777777777733333");
 176   checkit ("%f%s%d%s", 1.0, "foo", 77, "asdjffffffffffffffiiiiiiiiiiixxxxx");
 177
 178   return 0;
 179 }
 180 #endif /* TEST */