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