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comparison simtool/hexread.c @ 101:454ff8bd0b83

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fc-simtool: update-bin command implemented
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 25 Jan 2021 01:54:43 +0000
parents
children 4aaf722ab933
comparison
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100:fa7005185b84 101:454ff8bd0b83
1 /*
2 * This module contains the function for reading hex files,
3 * to be used in the implementation of manual write commands.
4 */
5
6 #include <sys/types.h>
7 #include <ctype.h>
8 #include <string.h>
9 #include <strings.h>
10 #include <stdio.h>
11 #include <stdlib.h>
12
13 decode_hex_digit(c)
14 {
15 if (c >= '0' && c <= '9')
16 return(c - '0');
17 if (c >= 'A' && c <= 'F')
18 return(c - 'A' + 10);
19 if (c >= 'a' && c <= 'f')
20 return(c - 'a' + 10);
21 return(-1);
22 }
23
24 read_hex_data_file(filename, databuf)
25 char *filename;
26 u_char *databuf;
27 {
28 FILE *inf;
29 unsigned count;
30 int c, c2;
31
32 inf = fopen(filename, "r");
33 if (!inf) {
34 perror(filename);
35 return(-1);
36 }
37 for (count = 0; ; count++) {
38 do
39 c = getc(inf);
40 while (isspace(c));
41 if (c < 0)
42 break;
43 if (!isxdigit(c)) {
44 inv_input: fprintf(stderr, "%s: invalid hex file input\n",
45 filename);
46 fclose(inf);
47 return(-1);
48 }
49 c2 = getc(inf);
50 if (!isxdigit(c2))
51 goto inv_input;
52 if (count >= 255) {
53 fprintf(stderr, "%s: hex input data is too long\n",
54 filename);
55 fclose(inf);
56 return(-1);
57 }
58 databuf[count] = (decode_hex_digit(c) << 4) |
59 decode_hex_digit(c2);
60 }
61 fclose(inf);
62 if (!count) {
63 fprintf(stderr, "%s: no hex data input found\n", filename);
64 return(-1);
65 }
66 return(count);
67 }