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comparison libcommon/atr.c @ 9:c9ef9e91dd8e

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new libcommon, initial version
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 14 Mar 2021 06:55:38 +0000
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8:34bbb0585cab 9:c9ef9e91dd8e
1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <string.h>
4 #include <strings.h>
5
6 extern FILE *cpipeF, *rpipeF;
7 extern char be_atr_string[];
8
9 cmd_atr()
10 {
11 char inbuf[128], *cp;
12
13 /* do we have it already? */
14 if (be_atr_string[0]) {
15 printf("ATR: %s\n", be_atr_string);
16 return(0);
17 }
18 /* nope - request it from the BE */
19 fputs("atr\n", cpipeF);
20 fflush(cpipeF);
21 /* collect BE response */
22 if (!fgets(inbuf, sizeof inbuf, rpipeF)) {
23 fprintf(stderr, "comm error: EOF reading from back end\n");
24 return(-1);
25 }
26 cp = index(inbuf, '\n');
27 if (!cp) {
28 fprintf(stderr,
29 "comm error: response from back end has no newline\n");
30 return(-1);
31 }
32 *cp = '\0';
33 if (!inbuf[0]) {
34 fprintf(stderr,
35 "comm error: response from back end is an empty line\n");
36 return(-1);
37 }
38 puts(inbuf);
39 return(0);
40 }