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annotate libcommon/cardconnect.c @ 32:b37fcb235848

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recent libcommon/cardconnect.c change: missed SCardReleaseContext() on error
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 12 Feb 2021 17:22:25 +0000
parents 84d1c31d0fad
children 8a4f3d00d997
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1 #include <string.h>
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2 #include <strings.h>
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3 #include <stdio.h>
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4 #include <stdlib.h>
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5 #include <pcsclite.h>
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6 #include <winscard.h>
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7
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8 SCARDCONTEXT hContext;
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9 SCARDHANDLE hCard;
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10 char *reader_list, *selected_reader;
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11
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12 setup_pcsc_context()
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13 {
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14 LONG rv;
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15
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16 rv = SCardEstablishContext(SCARD_SCOPE_SYSTEM, NULL, NULL, &hContext);
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17 if (rv != SCARD_S_SUCCESS) {
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18 fprintf(stderr, "SCardEstablishContext: %s\n",
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19 pcsc_stringify_error(rv));
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20 exit(1);
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21 }
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22 return(0);
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23 }
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24
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25 get_reader_list()
0
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26 {
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27 LONG rv;
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28 DWORD dwReaders;
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29
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30 rv = SCardListReaders(hContext, NULL, NULL, &dwReaders);
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31 if (rv != SCARD_S_SUCCESS) {
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32 fprintf(stderr, "SCardListReaders 1st call: %s\n",
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33 pcsc_stringify_error(rv));
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34 SCardReleaseContext(hContext);
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35 exit(1);
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36 }
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37 if (dwReaders < 1) {
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38 fprintf(stderr,
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39 "error: dwReaders returned by SCardListReaders() is less than 1\n");
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40 SCardReleaseContext(hContext);
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41 exit(1);
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42 }
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43 reader_list = malloc(dwReaders);
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44 if (!reader_list) {
0
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45 perror("malloc for readers list");
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46 SCardReleaseContext(hContext);
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47 exit(1);
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48 }
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49 reader_list[0] = '\0';
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50 rv = SCardListReaders(hContext, NULL, reader_list, &dwReaders);
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51 if (rv != SCARD_S_SUCCESS) {
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52 fprintf(stderr, "SCardListReaders 2nd call: %s\n",
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53 pcsc_stringify_error(rv));
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54 SCardReleaseContext(hContext);
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55 exit(1);
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56 }
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57 return(0);
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58 }
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59
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60 select_reader_num(select_num)
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61 unsigned select_num;
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62 {
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63 char *cp;
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64 unsigned num;
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65
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66 for (cp = reader_list, num = 0; *cp; num++) {
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67 if (num == select_num) {
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68 selected_reader = cp;
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69 return(0);
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70 }
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71 cp += strlen(cp) + 1;
0
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72 }
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73 fprintf(stderr,
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74 "error: requested reader #%u, but only %u readers found\n",
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75 select_num, num);
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76 SCardReleaseContext(hContext);
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77 exit(1);
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78 }
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79
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80 connect_to_card()
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81 {
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82 LONG rv;
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83 DWORD dwActiveProtocol;
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84
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85 rv = SCardConnect(hContext, selected_reader, SCARD_SHARE_EXCLUSIVE,
0
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86 SCARD_PROTOCOL_T0, &hCard, &dwActiveProtocol);
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87 if (rv != SCARD_S_SUCCESS) {
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88 fprintf(stderr, "SCardConnect: %s\n", pcsc_stringify_error(rv));
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89 SCardReleaseContext(hContext);
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90 exit(1);
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91 }
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92 return(0);
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93 }