64 lines
1.1 KiB
C
64 lines
1.1 KiB
C
#include <stdio.h>
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// TODO: ASCII/Position printing
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// TODO: Stop appending garbage at file end
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#define BYTES 1024
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#define BYTES_PER_LINE 10
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void print_hex(unsigned char* buf, int byteno)
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{
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for (int i=0; i<byteno; i++)
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{
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if (i % BYTES_PER_LINE == 0)
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{
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puts("");
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}
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printf("%.2X ", buf[i]);
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}
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puts("");
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}
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int main(int argc, char** argv)
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{
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if (argc != 2)
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{
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printf("Usage: %s <file>\n", argv[0]);
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return -1;
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}
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FILE* f = fopen(argv[1], "r");
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unsigned char buf[BYTES];
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int byteno = fread(buf, 1, BYTES, f);
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print_hex(buf, byteno);
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for (;;)
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{
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char cmd;
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int loc;
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scanf("%c%d", &cmd, &loc);
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switch(cmd)
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{
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case 'p':
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case 'P':
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print_hex(buf + loc, BYTES_PER_LINE);
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break;
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case 'e':
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case 'E':
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scanf("%hhx", buf + loc);
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break;
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case 's':
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case 'S':
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fclose(f);
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f = fopen(argv[1], "w");
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fwrite(buf, 1, BYTES, f);
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fclose(f);
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break;
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case 'q':
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case 'Q':
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return 0;
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break;
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}
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}
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}
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