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Print HEX in C
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| #include <stdio.h> | |
| #include <string.h> | |
| #define MAX_DATA_LEN 1024 | |
| static unsigned char hex_string[MAX_DATA_LEN]; | |
| static inline char convert_to_printable(char c) | |
| { | |
| return c < 32 || c > 126 ? '.' : c; | |
| } | |
| static void print_hex(const unsigned char *buf, | |
| int length, | |
| int width, | |
| int error /* void (*printf)(const char *) */) | |
| { | |
| int remainder = length % width; | |
| int whole = length - remainder; | |
| int i = 0; | |
| int j = 0; | |
| int offset = 0; | |
| memset(hex_string, 0, sizeof(hex_string)); | |
| if (!error) | |
| fprintf(stdout, "(%p, %d bytes)\n", buf, length); | |
| else | |
| fprintf(stderr, "(%p, %d bytes)\n", buf, length); | |
| for (i = 0; i < whole; i += width) | |
| { | |
| offset = 0; | |
| offset += snprintf((char *)(hex_string + offset), sizeof(hex_string) - offset, "| 0x%08X | ", i); | |
| for (j = 0; j < width; j++) | |
| offset += snprintf((char *)(hex_string + offset), sizeof(hex_string) - offset, "%02X ", buf[i + j]); | |
| offset += snprintf((char *)(hex_string + offset), sizeof(hex_string) - offset, "| "); | |
| for (j = 0; j < width; j++) | |
| offset += snprintf((char *)(hex_string + offset), sizeof(hex_string) - offset, "%c", convert_to_printable(buf[i + j])); | |
| offset += snprintf((char *)(hex_string + offset), sizeof(hex_string) - offset, " |"); | |
| if (!error) | |
| fprintf(stdout, "%s\n", hex_string); | |
| else | |
| fprintf(stderr, "%s\n", hex_string); | |
| } | |
| if (remainder) | |
| { | |
| offset = 0; | |
| offset += snprintf((char *)(hex_string + offset), sizeof(hex_string) - offset, "| 0x%08X | ", i); | |
| for (j = 0; j < remainder; j++) | |
| offset += snprintf((char *)(hex_string + offset), sizeof(hex_string) - offset, "%02X ", buf[whole + j]); | |
| for (j = 0; j < width - remainder; j++) | |
| offset += snprintf((char *)(hex_string + offset), sizeof(hex_string) - offset, " "); | |
| offset += snprintf((char *)(hex_string + offset), sizeof(hex_string) - offset, "| "); | |
| for (j = 0; j < remainder; j++) | |
| offset += snprintf((char *)(hex_string + offset), sizeof(hex_string) - offset, "%c", convert_to_printable(buf[i + j])); | |
| for (j = 0; j < width - remainder; j++) | |
| offset += snprintf((char *)(hex_string + offset), sizeof(hex_string) - offset, " "); | |
| offset += snprintf((char *)(hex_string + offset), sizeof(hex_string) - offset, " |"); | |
| if (!error) | |
| fprintf(stdout, "%s\n", hex_string); | |
| else | |
| fprintf(stderr, "%s\n", hex_string); | |
| } | |
| memset(hex_string, 0, sizeof(hex_string)); | |
| } | |
| int main(int argc, char **argv) | |
| { | |
| const char *str = "What is the key to life on Earth?"; | |
| print_hex(str, strlen(str), 16, 0); | |
| return 0; | |
| } |
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