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annotate pcsc/context.c @ 63:f4eb486aab40

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doc/Admin-write-commands: fix verify-hex command name
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 23 Mar 2021 23:29:31 +0000
parents f4479a0d4cea
children
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1 #include <stdio.h>
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2 #include <stdlib.h>
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3 #include <pcsclite.h>
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4 #include <winscard.h>
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5
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6 SCARDCONTEXT hContext;
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7 char *reader_list;
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8
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9 setup_pcsc_context()
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10 {
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11 LONG rv;
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12
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13 rv = SCardEstablishContext(SCARD_SCOPE_SYSTEM, NULL, NULL, &hContext);
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14 if (rv != SCARD_S_SUCCESS) {
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15 fprintf(stderr, "SCardEstablishContext: %s\n",
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16 pcsc_stringify_error(rv));
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17 exit(1);
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18 }
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19 return(0);
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20 }
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21
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22 get_reader_list()
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23 {
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24 LONG rv;
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25 DWORD dwReaders;
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26
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27 rv = SCardListReaders(hContext, NULL, NULL, &dwReaders);
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28 if (rv != SCARD_S_SUCCESS) {
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29 fprintf(stderr, "SCardListReaders 1st call: %s\n",
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30 pcsc_stringify_error(rv));
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31 SCardReleaseContext(hContext);
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32 exit(1);
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33 }
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34 if (dwReaders < 1) {
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35 fprintf(stderr,
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36 "error: dwReaders returned by SCardListReaders() is less than 1\n");
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37 SCardReleaseContext(hContext);
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38 exit(1);
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39 }
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40 reader_list = malloc(dwReaders);
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41 if (!reader_list) {
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42 perror("malloc for readers list");
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43 SCardReleaseContext(hContext);
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44 exit(1);
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45 }
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46 reader_list[0] = '\0';
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47 rv = SCardListReaders(hContext, NULL, reader_list, &dwReaders);
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48 if (rv != SCARD_S_SUCCESS) {
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49 fprintf(stderr, "SCardListReaders 2nd call: %s\n",
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50 pcsc_stringify_error(rv));
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51 SCardReleaseContext(hContext);
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52 exit(1);
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53 }
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54 return(0);
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55 }