Subversion Repositories cpu_lecture

#include "assert.h"

#include "ctype.h"

#include "stdio.h"

#include "string.h"

//-----------------------------------------------------------------------------

int

main(int argc, const char * argv)

{

char buffer[2000];

int pc, val, val2;

   for (;;)

       {

         char * s = fgets(buffer, sizeof(buffer) - 2, stdin);

         if (s == 0)   return 0;

         // map lines '  xx:' and 'xxxxxxxx; to 2* the hex value.

         //

         if (

             (isxdigit(s[0]) || s[0] == ' ') &&

             (isxdigit(s[1]) || s[1] == ' ') &&

             (isxdigit(s[2]) || s[2] == ' ') &&

              isxdigit(s[3]) && s[4] == ':')   // '  xx:'

            {

              assert(1 == sscanf(s, " %x:", &pc));

              if (pc & 1)       printf("%4X+:", pc/2);

              else              printf("%4X:", pc/2);

              s += 5;

            }

         else if (isxdigit(s[0]) && isxdigit(s[1]) && isxdigit(s[2]) &&

                  isxdigit(s[3]) && isxdigit(s[4]) && isxdigit(s[5]) &&

                  isxdigit(s[6]) && isxdigit(s[7]))             // 'xxxxxxxx'

            {

              assert(1 == sscanf(s, "%x", &pc));

              if (pc & 1)   printf("%8.8X+:", pc/2);

              else          printf("%8.8X:", pc/2);

              s += 8;

            }

         else                             // other: copy verbatim

            {

              printf("%s", s);

              continue;

            }

          while (isblank(*s))   printf("%c", *s++);

          // endian swap.

          //

          while (isxdigit(s[0]) &&

                 isxdigit(s[1]) &&

                          s[2] == ' ' &&

                 isxdigit(s[3]) &&

                 isxdigit(s[4]) &&

                          s[5] == ' ')

             {

              assert(2 == sscanf(s, "%x %x ", &val, &val2));

              printf("%2.2X%2.2X  ", val2, val);

              s += 6;

             }

         char * s1 = strstr(s, ".+");

         char * s2 = strstr(s, ".-");

         if (s1)

            {

              assert(1 == sscanf(s1 + 2, "%d", &val));

              assert((val & 1) == 0);

              sprintf(s1, " 0x%X", (pc + val)/2 + 1);

              printf(s);

              s = s1 + strlen(s1) + 1;

            }

         else if (s2)

            {

              assert(1 == sscanf(s2 + 2, "%d", &val));

              assert((val & 1) == 0);

              sprintf(s2, " 0x%X", (pc - val)/2 + 1);

              printf(s);

              s = s2 + strlen(s2) + 1;

            }

         printf("%s", s);

       }

}

//-----------------------------------------------------------------------------