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comparison serial/hexinput.c @ 43:be27d1c85861

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serial: main function implemented
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 20 Mar 2021 21:49:59 +0000
parents pcsc/main.c@60fd23186e2e
children
comparison
equal deleted inserted replaced
42:6cc3eea720cb 43:be27d1c85861
1 #include <sys/types.h>
2 #include <ctype.h>
3 #include <stdio.h>
4
5 static
6 decode_hex_digit(c)
7 {
8 if (isdigit(c))
9 return c - '0';
10 else if (islower(c))
11 return c - 'a' + 10;
12 else
13 return c - 'A' + 10;
14 }
15
16 parse_hex_input(inbuf, outbuf)
17 char *inbuf;
18 u_char *outbuf;
19 {
20 char *cp;
21 unsigned count;
22
23 count = 0;
24 for (cp = inbuf; ; ) {
25 while (isspace(*cp))
26 cp++;
27 if (!*cp)
28 break;
29 if (!isxdigit(cp[0]) || !isxdigit(cp[1])) {
30 printf("error: invalid hex APDU input\n");
31 return(-1);
32 }
33 if (count >= 260) {
34 printf("error: command APDU is too long\n");
35 return(-1);
36 }
37 outbuf[count++] = (decode_hex_digit(cp[0]) << 4) |
38 decode_hex_digit(cp[1]);
39 cp += 2;
40 }
41 return count;
42 }