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Compact C Hex Dump Function w/ASCII to buffer
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#include <stdio.h> | |
void dump_hex(const void *data, size_t size, char *output) | |
{ | |
char ascii[17]; | |
size_t i, j; | |
ascii[16] = '\0'; | |
for (i = 0; i < size; ++i) | |
{ | |
if ((i % 16) == 0) | |
{ | |
output += sprintf(output, "%08x ", i); | |
} | |
output += sprintf(output, "%02X ", ((unsigned char *) data)[i]); | |
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) | |
{ | |
output += sprintf(output, "%c", ' '); | |
if ((i + 1) % 16 == 0) | |
{ | |
output += sprintf(output, " %s \n", ascii); | |
} | |
else if (i + 1 == size) | |
{ | |
ascii[(i + 1) % 16] = '\0'; | |
if ((i + 1) % 16 <= 8) | |
{ | |
output += sprintf(output, "%c", ' '); | |
} | |
for (j = (i + 1) % 16; j < 16; ++j) | |
{ | |
output += sprintf(output, "%s", " "); | |
} | |
output += sprintf(output, " %s \n", ascii); | |
} | |
} | |
} | |
*(output) = '\0'; | |
} |
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