util/hexdump.c

/*
 * Helper to hexdump a buffer
 *
 * Copyright (c) 2013 Red Hat, Inc.
 * Copyright (c) 2013 Gerd Hoffmann <kraxel@redhat.com>
 * Copyright (c) 2013 Peter Crosthwaite <peter.crosthwaite@xilinx.com>
 * Copyright (c) 2013 Xilinx, Inc
 *
 * This work is licensed under the terms of the GNU GPL, version 2.  See
 * the COPYING file in the top-level directory.
 *
 * Contributions after 2012-01-13 are licensed under the terms of the
 * GNU GPL, version 2 or (at your option) any later version.
 */

#include "qemu/osdep.h"
#include "qemu/cutils.h"

void qemu_hexdump_line(char *line, const void *bufptr, size_t len)
{
    const char *buf = bufptr;
    int i;

    if (len > QEMU_HEXDUMP_LINE_BYTES) {
        len = QEMU_HEXDUMP_LINE_BYTES;
    }

    for (i = 0; i < len; i++) {
        if (i != 0 && (i % 4) == 0) {
            *line++ = ' ';
        }
        line += sprintf(line, " %02x", (unsigned char)buf[i]);
    }
    *line = '\0';
}

static void asciidump_line(char *line, const void *bufptr, size_t len)
{
    const char *buf = bufptr;

    for (size_t i = 0; i < len; i++) {
        char c = buf[i];

        if (c < ' ' || c > '~') {
            c = '.';
        }
        *line++ = c;
    }
    *line = '\0';
}

#define QEMU_HEXDUMP_LINE_WIDTH \
    (QEMU_HEXDUMP_LINE_BYTES * 2 + QEMU_HEXDUMP_LINE_BYTES / 4)

void qemu_hexdump(FILE *fp, const char *prefix,
                  const void *bufptr, size_t size)
{
    char line[QEMU_HEXDUMP_LINE_LEN];
    char ascii[QEMU_HEXDUMP_LINE_BYTES + 1];
    size_t b, len;

    for (b = 0; b < size; b += len) {
        len = MIN(size - b, QEMU_HEXDUMP_LINE_BYTES);

        qemu_hexdump_line(line, bufptr + b, len);
        asciidump_line(ascii, bufptr + b, len);

        fprintf(fp, "%s: %04zx: %-*s %s\n",
                prefix, b, QEMU_HEXDUMP_LINE_WIDTH, line, ascii);
    }

}