source: buchla-68k/iolib/mdump.c@ 4cfe69a

/*
   =============================================================================
        mdump.c -- Hexadecimal memory dump
        Version 5 -- 1987-10-29 -- D.N. Lynx Crowe

        Displays the contents of memory in hexadecimal.
        If a byte is printable, it is also printed.

        The format of the output is :

           hex_add byte byte byte byte ... byte byte byte byte  string  

        where:

                hex_add   Start address for that line in hex. 
                byte      Representation of a byte in hex. Two characters
                                for each byte.  PERLINE bytes per line.
                string    If the character is printable, it is printed,
                                otherwise a '.' is printed.
   =============================================================================
*/

#define TESTER          0

#include "ram.h"

#define PERLINE 16

/*
   =============================================================================
        pipc() -- print if printable characters
   =============================================================================
*/

static void pipc(int8_t chars[], int16_t length)
{
        int16_t i;

        for (i = 0; i < length; i++)
                if (isascii(0x00FF & chars[i]) AND (isprint(0x00FF & chars[i])))
                        printf("%c", chars[i]);
                else
                        printf(".");
}

/*
   =============================================================================
        mdump() -- dump a memory area in hexadecimal
   =============================================================================
*/

void mdump(int8_t *from, int8_t *to, int32_t start)
{
        int32_t i, ii;
        int16_t j, jj, k;
        int8_t  c, chars[PERLINE];

        i = 0L;
        ii = start;
        j = 0;

        if (from GT to)
                return;

        while (from LE to) {

                c = *from++;

                if (! (i % PERLINE)) {

                        if (i) {

                                j=0;
                                printf("  ");
                                pipc(chars, PERLINE);
                        }
                
                        printf("\n%08lX:", ii);
                }

                ii++;
                i++;

                printf(" %02.2X", (c & 0x00FF));
                chars[j++] = c;
        }

        if ((k = (int16_t)(i % PERLINE))) {

                k = PERLINE - k;

                for (jj = 0; jj < (3 * k); ++jj)
                        printf(" ");
        }

        printf("  ");
        pipc(chars, PERLINE);
        printf("\n");
}

#if     TESTER

char    area[128];

main()
{
        register short i;

        for (i = 0; i < 128; i++)
                area[i] = i + 128;

        mdump(area, (area + 127), area);
}

#endif