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#include <stdio.h>
#include <ctype.h>
#include <errno.h>
int lastnum[16] = {-1};
long lastaddr = -1;
long offset = 0;
FILE *fd;
FILE * ofd = stdout;
char * outfile = 0;
int reverse = 0;
main(argc, argv)
int argc;
char **argv;
{
int done = 0;
int ar;
int aflag = 1;
for (ar = 1; ar < argc; ar++)
if (aflag && argv[ar][0] == '-')
switch (argv[ar][1])
{
case 'r': /* Reverse */
reverse = 1;
break;
case 's': /* Skip */
offset = strtol(argv[ar] + 2, (void *) 0, 0);
break;
case '-':
aflag = 0;
break;
case 'o': /* Output */
if( argv[ar][2] ) outfile = argv[ar]+2;
else
{
if( ++ar >= argc ) Usage();
outfile = argv[ar];
}
break;
default:
Usage();
}
else
{
if( outfile )
{
if( ofd != stdout ) fclose(ofd);
#ifdef MSDOS
if( reverse )
ofd = fopen(outfile, "wb");
else
#endif
ofd = fopen(outfile, "w");
if( ofd == 0 )
{
fprintf(stderr, "Cannot open file '%s'\n", outfile);
exit(9);
}
}
fd = fopen(argv[ar], "rb");
if (fd == 0)
fprintf(stderr, "Cannot open file '%s'\n", argv[ar]);
else
{
if( reverse )
do_rev_fd();
else
do_fd();
fclose(fd);
}
done = 1;
}
if (!done)
#ifdef MSDOS
Usage();
#else
{
fd = stdin;
if( reverse )
do_rev_fd();
else
do_fd();
}
#endif
exit(0);
}
Usage()
{
fprintf(stderr, "Usage: hd [-o Outfile][-r]|[[-sSkip_bytes] file]\n");
exit(1);
}
do_fd()
{
int j, ch;
char buf[20];
int num[16];
if (offset)
fseek(fd, offset, 0);
for (ch = 0; ch != EOF; offset += 16)
{
memset(buf, '\0', 16);
for (j = 0; j < 16; j++)
num[j] = -1;
for (j = 0; j < 16; j++)
{
ch = fgetc(fd);
if (ch == EOF)
break;
num[j] = ch;
if (isascii(ch) && isprint(ch))
buf[j] = ch;
else
buf[j] = '.';
}
printline(offset, num, buf, ch == EOF);
}
}
printline(address, num, chr, eofflag)
long address;
int *num;
char *chr;
int eofflag;
{
int j;
if (lastaddr >= 0)
{
for (j = 0; j < 16; j++)
if (num[j] != lastnum[j])
break;
if (j == 16 && !eofflag)
{
if (lastaddr + 16 == address)
{
fprintf(ofd, "*\n");
fflush(ofd);
}
return;
}
}
lastaddr = address;
fprintf(ofd, "%06lx:", address);
for (j = 0; j < 16; j++)
{
if (j == 8)
fputc(' ', ofd);
if (num[j] >= 0)
fprintf(ofd, " %02x", num[j]);
else
fprintf(ofd, " ");
lastnum[j] = num[j];
num[j] = -1;
}
fprintf(ofd, " %.16s\n", chr);
}
/*
* This function takes output from hd and converts it back into a binary
* file
*/
do_rev_fd()
{
char str[160];
char * ptr;
int c[16], i, nxtaddr, addr;
int zap_last = 1;
for (i = 0; i < 16; i++)
c[i] = 0;
nxtaddr = 0;
for (nxtaddr = 0;;)
{
if (fgets(str, sizeof(str), fd) == NULL)
break;
str[57] = 0;
ptr = str;
if( *ptr == '*' ) zap_last = 0;
if( !isxdigit(*ptr) ) continue;
addr = strtol(ptr, &ptr, 16);
if( *ptr == ':' ) ptr++;
if (nxtaddr == 0)
nxtaddr = addr;
if( zap_last ) memset(c, 0, sizeof(c));
else zap_last = 1;
while (nxtaddr < addr)
{
for (i = 0; nxtaddr < addr && i < 16; i++, nxtaddr++)
fputc(c[i], ofd);
}
for (i = 0; i < 16 && *ptr; i++)
{
char * ptr2;
c[i] = strtol(ptr, &ptr2, 16);
if( ptr == ptr2 ) break;
fputc(c[i], ofd);
ptr = ptr2;
}
nxtaddr += 16;
}
return 0;
}
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