util/hexdump.c

   1 /*
   2  * Helper to hexdump a buffer
   3  *
   4  * Copyright (c) 2013 Red Hat, Inc.
   5  * Copyright (c) 2013 Gerd Hoffmann <kraxel@redhat.com>
   6  * Copyright (c) 2013 Peter Crosthwaite <peter.crosthwaite@xilinx.com>
   7  * Copyright (c) 2013 Xilinx, Inc
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2.  See
  10  * the COPYING file in the top-level directory.
  11  *
  12  * Contributions after 2012-01-13 are licensed under the terms of the
  13  * GNU GPL, version 2 or (at your option) any later version.
  14  */
  15
  16 #include "qemu/osdep.h"
  17 #include "qemu/cutils.h"
  18
  19 void qemu_hexdump_line(char *line, unsigned int b, const void *bufptr,
  20                        unsigned int len, bool ascii)
  21 {
  22     const char *buf = bufptr;
  23     int i, c;
  24
  25     if (len > QEMU_HEXDUMP_LINE_BYTES) {
  26         len = QEMU_HEXDUMP_LINE_BYTES;
  27     }
  28
  29     line += snprintf(line, 6, "%04x:", b);
  30     for (i = 0; i < QEMU_HEXDUMP_LINE_BYTES; i++) {
  31         if ((i % 4) == 0) {
  32             *line++ = ' ';
  33         }
  34         if (i < len) {
  35             line += sprintf(line, " %02x", (unsigned char)buf[b + i]);
  36         } else {
  37             line += sprintf(line, "   ");
  38         }
  39     }
  40     if (ascii) {
  41         *line++ = ' ';
  42         for (i = 0; i < len; i++) {
  43             c = buf[b + i];
  44             if (c < ' ' || c > '~') {
  45                 c = '.';
  46             }
  47             *line++ = c;
  48         }
  49     }
  50     *line = '\0';
  51 }
  52
  53 void qemu_hexdump(FILE *fp, const char *prefix,
  54                   const void *bufptr, size_t size)
  55 {
  56     unsigned int b, len;
  57     char line[QEMU_HEXDUMP_LINE_LEN];
  58
  59     for (b = 0; b < size; b += QEMU_HEXDUMP_LINE_BYTES) {
  60         len = size - b;
  61         qemu_hexdump_line(line, b, bufptr, len, true);
  62         fprintf(fp, "%s: %s\n", prefix, line);
  63     }
  64
  65 }