/*
* Copyright (c) 1995-1999 Kungliga Tekniska H�gskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#include <config.h>

#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <sys/types.h>

#include "netdissect.h"

enum format_flags {
   minus_flag     =  1,
   plus_flag      =  2,
   space_flag     =  4,
   alternate_flag =  8,
   zero_flag      = 16
};

/*
* Common state
*/

struct state {
 unsigned char *str;
 unsigned char *s;
 unsigned char *theend;
 size_t sz;
 size_t max_sz;
 int (*append_char)(struct state *, unsigned char);
 int (*reserve)(struct state *, size_t);
 /* XXX - methods */
};

#if 0
static int
as_reserve (struct state *state, size_t n)
{
 if (state->s + n > state->theend) {
   int off = state->s - state->str;
   unsigned char *tmp;

   if (state->max_sz && state->sz >= state->max_sz)
     return 1;

   state->sz = max(state->sz * 2, state->sz + n);
   if (state->max_sz)
     state->sz = min(state->sz, state->max_sz);
   tmp = realloc (state->str, state->sz);
   if (tmp == NULL)
     return 1;
   state->str = tmp;
   state->s = state->str + off;
   state->theend = state->str + state->sz - 1;
 }
 return 0;
}

static int
as_append_char (struct state *state, unsigned char c)
{
 if(as_reserve (state, 1))
   return 1;
 else {
   *state->s++ = c;
   return 0;
 }
}
#endif

static int
append_number(struct state *state,
             unsigned long num, unsigned base, char *rep,
             int width, int prec, int flags, int minusp)
{
 int len = 0;
 int i;

 /* given precision, ignore zero flag */
 if(prec != -1)
   flags &= ~zero_flag;
 else
   prec = 1;
 /* zero value with zero precision -> "" */
 if(prec == 0 && num == 0)
   return 0;
 do{
   if((*state->append_char)(state, rep[num % base]))
     return 1;
   len++;
   num /= base;
 }while(num);
 prec -= len;
 /* pad with prec zeros */
 while(prec-- > 0){
   if((*state->append_char)(state, '0'))
     return 1;
   len++;
 }
 /* add length of alternate prefix (added later) to len */
 if(flags & alternate_flag && (base == 16 || base == 8))
   len += base / 8;
 /* pad with zeros */
 if(flags & zero_flag){
   width -= len;
   if(minusp || (flags & space_flag) || (flags & plus_flag))
     width--;
   while(width-- > 0){
     if((*state->append_char)(state, '0'))
       return 1;
     len++;
   }
 }
 /* add alternate prefix */
 if(flags & alternate_flag && (base == 16 || base == 8)){
   if(base == 16)
     if((*state->append_char)(state, rep[10] + 23)) /* XXX */
       return 1;
   if((*state->append_char)(state, '0'))
     return 1;
 }
 /* add sign */
 if(minusp){
   if((*state->append_char)(state, '-'))
     return 1;
   len++;
 } else if(flags & plus_flag) {
   if((*state->append_char)(state, '+'))
     return 1;
   len++;
 } else if(flags & space_flag) {
   if((*state->append_char)(state, ' '))
     return 1;
   len++;
 }
 if(flags & minus_flag)
   /* swap before padding with spaces */
   for(i = 0; i < len / 2; i++){
     char c = state->s[-i-1];
     state->s[-i-1] = state->s[-len+i];
     state->s[-len+i] = c;
   }
 width -= len;
 while(width-- > 0){
   if((*state->append_char)(state,  ' '))
     return 1;
   len++;
 }
 if(!(flags & minus_flag))
   /* swap after padding with spaces */
   for(i = 0; i < len / 2; i++){
     char c = state->s[-i-1];
     state->s[-i-1] = state->s[-len+i];
     state->s[-len+i] = c;
   }

 return 0;
}

static int
append_string (struct state *state,
              unsigned char *arg,
              int width,
              int prec,
              int flags)
{
 if(prec != -1)
   width -= prec;
 else
   width -= strlen((char *)arg);
 if(!(flags & minus_flag))
   while(width-- > 0)
     if((*state->append_char) (state, ' '))
       return 1;
 if (prec != -1) {
   while (*arg && prec--)
     if ((*state->append_char) (state, *arg++))
       return 1;
 } else {
   while (*arg)
     if ((*state->append_char) (state, *arg++))
       return 1;
 }
 if(flags & minus_flag)
   while(width-- > 0)
     if((*state->append_char) (state, ' '))
       return 1;
 return 0;
}

static int
append_char(struct state *state,
           unsigned char arg,
           int width,
           int flags)
{
 while(!(flags & minus_flag) && --width > 0)
   if((*state->append_char) (state, ' '))
     return 1;

 if((*state->append_char) (state, arg))
   return 1;
 while((flags & minus_flag) && --width > 0)
   if((*state->append_char) (state, ' '))
     return 1;

 return 0;
}

/*
* This can't be made into a function...
*/

#define PARSE_INT_FORMAT(res, arg, unsig) \
if (long_flag) \
    res = (unsig long)va_arg(arg, unsig long); \
else if (short_flag) \
    res = (unsig short)va_arg(arg, unsig int); \
else \
    res = (unsig int)va_arg(arg, unsig int)

/*
* zyxprintf - return 0 or -1
*/

static int
xyzprintf (struct state *state, const char *char_format, va_list ap)
{
 const unsigned char *format = (const unsigned char *)char_format;
 unsigned char c;

 while((c = *format++)) {
   if (c == '%') {
     int flags      = 0;
     int width      = 0;
     int prec       = -1;
     int long_flag  = 0;
     int short_flag = 0;

     /* flags */
     while((c = *format++)){
       if(c == '-')
         flags |= minus_flag;
       else if(c == '+')
         flags |= plus_flag;
       else if(c == ' ')
         flags |= space_flag;
       else if(c == '#')
         flags |= alternate_flag;
       else if(c == '0')
         flags |= zero_flag;
       else
         break;
     }

     if((flags & space_flag) && (flags & plus_flag))
       flags ^= space_flag;

     if((flags & minus_flag) && (flags & zero_flag))
       flags ^= zero_flag;

     /* width */
     if (isdigit(c))
       do {
         width = width * 10 + c - '0';
         c = *format++;
       } while(isdigit(c));
     else if(c == '*') {
       width = va_arg(ap, int);
       c = *format++;
     }

     /* precision */
     if (c == '.') {
       prec = 0;
       c = *format++;
       if (isdigit(c))
         do {
           prec = prec * 10 + c - '0';
           c = *format++;
         } while(isdigit(c));
       else if (c == '*') {
         prec = va_arg(ap, int);
         c = *format++;
       }
     }

     /* size */

     if (c == 'h') {
       short_flag = 1;
       c = *format++;
     } else if (c == 'l') {
       long_flag = 1;
       c = *format++;
     }

     switch (c) {
     case 'c' :
       if(append_char(state, va_arg(ap, int), width, flags))
         return -1;
       break;
     case 's' :
       if (append_string(state,
                         va_arg(ap, unsigned char*),
                         width,
                         prec,
                         flags))
         return -1;
       break;
     case 'd' :
     case 'i' : {
       long arg;
       unsigned long num;
       int minusp = 0;

       PARSE_INT_FORMAT(arg, ap, signed);

       if (arg < 0) {
         minusp = 1;
         num = -arg;
       } else
         num = arg;

       if (append_number (state, num, 10, "0123456789",
                          width, prec, flags, minusp))
         return -1;
       break;
     }
     case 'u' : {
       unsigned long arg;

       PARSE_INT_FORMAT(arg, ap, unsigned);

       if (append_number (state, arg, 10, "0123456789",
                          width, prec, flags, 0))
         return -1;
       break;
     }
     case 'o' : {
       unsigned long arg;

       PARSE_INT_FORMAT(arg, ap, unsigned);

       if (append_number (state, arg, 010, "01234567",
                          width, prec, flags, 0))
         return -1;
       break;
     }
     case 'x' : {
       unsigned long arg;

       PARSE_INT_FORMAT(arg, ap, unsigned);

       if (append_number (state, arg, 0x10, "0123456789abcdef",
                          width, prec, flags, 0))
         return -1;
       break;
     }
     case 'X' :{
       unsigned long arg;

       PARSE_INT_FORMAT(arg, ap, unsigned);

       if (append_number (state, arg, 0x10, "0123456789ABCDEF",
                          width, prec, flags, 0))
         return -1;
       break;
     }
     case 'p' : {
       unsigned long arg = (unsigned long)va_arg(ap, void*);

       if (append_number (state, arg, 0x10, "0123456789ABCDEF",
                          width, prec, flags, 0))
         return -1;
       break;
     }
     case 'n' : {
       int *arg = va_arg(ap, int *);
       *arg = state->s - state->str;
       break;
     }
     case '\0' :
         --format;
         /* FALLTHROUGH */
     case '%' :
       if ((*state->append_char)(state, c))
         return -1;
       break;
     default :
       if (   (*state->append_char)(state, '%')
           || (*state->append_char)(state, c))
         return -1;
       break;
     }
   } else
     if ((*state->append_char) (state, c))
       return -1;
 }
 return 0;
}

#if 0
#ifndef HAVE_ASPRINTF
int
asprintf (char **ret, const char *format, ...)
{
 va_list args;
 int val;

 va_start(args, format);
 val = vasprintf (ret, format, args);

#ifdef PARANOIA
 {
   int ret2;
   char *tmp;
   tmp = malloc (val + 1);
   if (tmp == NULL)
     abort ();

   ret2 = vsprintf (tmp, format, args);
   if (val != ret2 || strcmp(*ret, tmp))
     abort ();
   free (tmp);
 }
#endif

 va_end(args);
 return val;
}
#endif

#ifndef HAVE_VASNPRINTF
int
nd_vasnprintf (char **ret, size_t max_sz, const char *format, va_list args)
{
 int st;
 size_t len;
 struct state state;

 state.max_sz = max_sz;
 state.sz     = 1;
 state.str    = malloc(state.sz);
 if (state.str == NULL) {
   *ret = NULL;
   return -1;
 }
 state.s = state.str;
 state.theend = state.s + state.sz - 1;
 state.append_char = as_append_char;
 state.reserve     = as_reserve;

 st = xyzprintf (&state, format, args);
 if (st) {
   free (state.str);
   *ret = NULL;
   return -1;
 } else {
   char *tmp;

   *state.s = '\0';
   len = state.s - state.str;
   tmp = realloc (state.str, len+1);
   if (tmp == NULL) {
     free (state.str);
     *ret = NULL;
     return -1;
   }
   *ret = tmp;
   return len;
 }
}
#endif
#endif

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