C function to dump memory

hex_dump.c

void hexDump(char *desc, void *addr, int len) 
{
    int i;
    unsigned char buff[17];
    unsigned char *pc = (unsigned char*)addr;

    // Output description if given.
    if (desc != NULL)
        printf ("%s:\n", desc);

    // Process every byte in the data.
    for (i = 0; i < len; i++) {
        // Multiple of 16 means new line (with line offset).

        if ((i % 16) == 0) {
            // Just don't print ASCII for the zeroth line.
            if (i != 0)
                printf("  %s\n", buff);

            // Output the offset.
            printf("  %04x ", i);
        }

        // Now the hex code for the specific character.
        printf(" %02x", pc[i]);

        // And store a printable ASCII character for later.
        if ((pc[i] < 0x20) || (pc[i] > 0x7e)) {
            buff[i % 16] = '.';
        } else {
            buff[i % 16] = pc[i];
        }

        buff[(i % 16) + 1] = '\0';
    }

    // Pad out last line if not exactly 16 characters.
    while ((i % 16) != 0) {
        printf("   ");
        i++;
    }

    // And print the final ASCII bit.
    printf("  %s\n", buff);
}

LICENSE

Copyright 2018 Dominik Liebler

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Thank you for the function.

Output sample :

DESC:
  0000  33 38 33 31 33 32 33 33 33 31 34 35 33 31 33 35  3831323331453135
  0010  33 31 33 39 34 36 33 30 32 30 32 30 32 30 32 30  3139463020202020
  0020  32 30 32 30 32 30 32 30                          20202020