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comparison libutil/hexread.c @ 157:f064dbcc5f41

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libutil split from libcommon
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 26 Feb 2021 20:19:58 +0000
parents libcommon/hexread.c@a1aa8ee2da85
children fc1635333d81
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156:5f1f3f6fd865 157:f064dbcc5f41
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 <stdio.h>
9 #include <stdlib.h>
10
11 extern FILE *open_script_input_file();
12
13 read_hex_data_file(filename, databuf, maxlen)
14 char *filename;
15 u_char *databuf;
16 unsigned maxlen;
17 {
18 FILE *inf;
19 unsigned count;
20 int c, c2;
21
22 inf = open_script_input_file(filename);
23 if (!inf) {
24 perror(filename);
25 return(-1);
26 }
27 for (count = 0; ; count++) {
28 do
29 c = getc(inf);
30 while (isspace(c));
31 if (c < 0)
32 break;
33 if (!isxdigit(c)) {
34 inv_input: fprintf(stderr, "%s: invalid hex file input\n",
35 filename);
36 fclose(inf);
37 return(-1);
38 }
39 c2 = getc(inf);
40 if (!isxdigit(c2))
41 goto inv_input;
42 if (count >= maxlen) {
43 fprintf(stderr, "%s: hex input data is too long\n",
44 filename);
45 fclose(inf);
46 return(-1);
47 }
48 databuf[count] = (decode_hex_digit(c) << 4) |
49 decode_hex_digit(c2);
50 }
51 fclose(inf);
52 if (!count) {
53 fprintf(stderr, "%s: no hex data input found\n", filename);
54 return(-1);
55 }
56 return(count);
57 }