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/* SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0-only */
#include "hexdump.h"
#include <ctype.h>
static void addrprint(FILE * outfile, uint64_t address, int width);
/*--------------------------------------------------------------------------
* hexdump
*
* Write a hex dump of 'mem' to 'outfile'.
*
* parameters:
* mem: a pointer to the memory to display
* bytes: the number of bytes of data to display
* addrprint_start: The address to associate with the first byte of
* data. For instance, a value of 0 indicates that the
* first byte displayed should be labeled as byte 0.
* outfile: The place where the hex dump should be written.
* For instance, stdout or stderr may be passed here.
* format: A structure specifying how the hex dump should be
* formatted.
*--------------------------------------------------------------------------*/
void hexdump(const void *mem, int bytes, uint64_t addrprint_start,
FILE * outfile, const hexdump_format_t * format)
{
int bytes_left, index, i;
const unsigned char *p;
/* Quietly return if the caller asks us to do something unreasonable. */
if ((format->bytes_per_line <= 0) || (bytes < 0))
return;
p = (const unsigned char *)mem;
index = 0;
/* Each iteration handles one full line of output. When loop
* terminates, the number of remaining bytes to display (if any)
* will not be enough to fill an entire line.
*/
for (bytes_left = bytes;
bytes_left >= format->bytes_per_line;
bytes_left -= format->bytes_per_line) {
/* print start address for current line */
fprintf(outfile, "%s", format->indent);
addrprint(outfile, addrprint_start + index,
format->addrprint_width);
fprintf(outfile, "%s", format->sep1);
/* display the bytes in hex */
for (i = 0;;) {
fprintf(outfile, "%02x", p[index++]);
if (++i >= format->bytes_per_line)
break;
fprintf(outfile, "%s", format->sep2);
}
index -= format->bytes_per_line;
fprintf(outfile, "%s", format->sep3);
/* display the bytes as characters */
for (i = 0; i < format->bytes_per_line; i++, index++)
fputc(isprint(p[index])?p[index]:format->nonprintable, outfile);
fprintf(outfile, "\n");
}
if (bytes_left == 0)
return;
/* print start address for last line */
fprintf(outfile, "%s", format->indent);
addrprint(outfile, addrprint_start + index, format->addrprint_width);
fprintf(outfile, "%s", format->sep1);
/* display bytes for last line in hex */
for (i = 0; i < bytes_left; i++) {
fprintf(outfile, "%02x", p[index++]);
fprintf(outfile, "%s", format->sep2);
}
index -= bytes_left;
/* pad the rest of the hex byte area with spaces */
for (;;) {
fprintf(outfile, " ");
if (++i >= format->bytes_per_line)
break;
fprintf(outfile, "%s", format->sep2);
}
fprintf(outfile, "%s", format->sep3);
/* display bytes for last line as characters */
for (i = 0; i < bytes_left; i++)
fputc(isprint(p[index])?p[index++]:format->nonprintable, outfile);
/* pad the rest of the character area with spaces */
for (; i < format->bytes_per_line; i++)
fprintf(outfile, " ");
fprintf(outfile, "\n");
}
/*--------------------------------------------------------------------------
* addrprint
*
* Display an address as a hexadecimal number.
*
* parameters:
* outfile: the place where the output should be written
* address: the address to display
* width: The number of bytes wide the address should be displayed as.
* Must be a value from 1 to 8.
*--------------------------------------------------------------------------*/
static void addrprint(FILE * outfile, uint64_t address, int width)
{
char s[17];
int i;
/* force the user's input to be valid */
if (width < 1)
width = 1;
else if (width > 8)
width = 8;
/* convert address to string */
sprintf(s, "%016llx", (unsigned long long)address);
/* write it out, with colons separating consecutive 16-bit
* chunks of the address
*/
for (i = 16 - (2 * width);;) {
fprintf(outfile, "%c", s[i]);
if (++i >= 16)
break;
if ((i % 4) == 0)
fprintf(outfile, ":");
}
}
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