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comparison libcommon/hexread.c @ 0:f7145c77b7fb

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starting libcommon: factored out of fc-simtool
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 11 Feb 2021 22:28:45 +0000
parents
children 94d87d05f6c5
comparison
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-1:000000000000 0:f7145c77b7fb
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 read_hex_data_file(filename, databuf)
14 char *filename;
15 u_char *databuf;
16 {
17 FILE *inf;
18 unsigned count;
19 int c, c2;
20
21 inf = fopen(filename, "r");
22 if (!inf) {
23 perror(filename);
24 return(-1);
25 }
26 for (count = 0; ; count++) {
27 do
28 c = getc(inf);
29 while (isspace(c));
30 if (c < 0)
31 break;
32 if (!isxdigit(c)) {
33 inv_input: fprintf(stderr, "%s: invalid hex file input\n",
34 filename);
35 fclose(inf);
36 return(-1);
37 }
38 c2 = getc(inf);
39 if (!isxdigit(c2))
40 goto inv_input;
41 if (count >= 255) {
42 fprintf(stderr, "%s: hex input data is too long\n",
43 filename);
44 fclose(inf);
45 return(-1);
46 }
47 databuf[count] = (decode_hex_digit(c) << 4) |
48 decode_hex_digit(c2);
49 }
50 fclose(inf);
51 if (!count) {
52 fprintf(stderr, "%s: no hex data input found\n", filename);
53 return(-1);
54 }
55 return(count);
56 }