Compact C Hex Dump Function w/ASCII

DumpHex.c

#include <stdio.h>

char* DumpHex2(const void* data, size_t size) {
    const int symbolSize = 100;
    char* buffer = calloc(10*size, sizeof(char));
    char* symbol = calloc(symbolSize, sizeof(char));

    char ascii[17];
    size_t i, j;
    ascii[16] = '\0';
    for (i = 0; i < size; ++i) {
        snprintf(symbol, symbolSize, "%02X ", ((unsigned char*)data)[i]);
        strcat(buffer, symbol);
        memset(symbol,0,strlen(symbol));
        if (((unsigned char*)data)[i] >= ' ' && ((unsigned char*)data)[i] <= '~') {
            ascii[i % 16] = ((unsigned char*)data)[i];
        } else {
            ascii[i % 16] = '.';
        }
        if ((i+1) % 8 == 0 || i+1 == size) {
            strcat(buffer, " ");
            if ((i+1) % 16 == 0) {
                snprintf(symbol, symbolSize, "|  %s \n", ascii);
                strcat(buffer, symbol);
                memset(symbol,0,strlen(symbol));
            } else if (i+1 == size) {
                ascii[(i+1) % 16] = '\0';
                if ((i+1) % 16 <= 8) {
                    strcat(buffer, " ");
                }
                for (j = (i+1) % 16; j < 16; ++j) {
                    strcat(buffer, "   ");
                }
                snprintf(symbol, symbolSize, "|  %s \n", ascii);
                strcat(buffer, symbol);
                memset(symbol,0,strlen(symbol));
            }
        }
    }

    free(symbol);

    return buffer;
}

Compiled first time with no corrections. Worked perfectly.

Don't forget to free those buffers after you're done folks!

How did you compile it without main()?

you'll need a main() of some sort. I just added the function to an existing project and it just worked.

Thank you so much man👍👍👍