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annotate libutil/gsm7_encode.c @ 49:831a224e182b

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doc/Back-end-selection article written
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 21 Mar 2021 06:24:52 +0000
parents 34bbb0585cab
children 1b905e730abd
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8
34bbb0585cab libutil: import from previous fc-pcsc-tools version
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1 /*
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2 * This module implements functions for parsing quoted string
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3 * arguments intended for GSM7 string encoding, and actually
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4 * encoding them into GSM7 binary strings.
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5 */
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6
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7 #include <sys/types.h>
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8 #include <ctype.h>
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9 #include <stdio.h>
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10
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11 extern u_char gsm7_encode_table[256];
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12
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13 qstring_arg_to_gsm7(arg, record, maxlen)
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14 char *arg;
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15 u_char *record;
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16 unsigned maxlen;
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17 {
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18 unsigned acclen, nadd;
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19 char *cp;
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20 int c;
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21
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22 cp = arg;
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23 for (acclen = 0; *cp; ) {
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24 c = *cp++;
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25 if (c == '\\') {
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26 if (*cp == '\0') {
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27 fprintf(stderr,
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28 "error: dangling backslash escape\n");
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29 return(-1);
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30 }
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31 c = *cp++;
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32 if (c >= '0' && c <= '7' && isxdigit(*cp)) {
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33 c = ((c - '0') << 4) | decode_hex_digit(*cp++);
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34 goto bypass_encoding;
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35 }
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36 switch (c) {
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37 case 'n':
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38 c = '\n';
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39 goto bypass_encoding;
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40 case 'r':
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41 c = '\r';
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42 goto bypass_encoding;
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43 case 'e':
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44 c = 0x1B;
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45 goto bypass_encoding;
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46 case '"':
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47 case '\\':
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48 break;
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49 default:
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50 fprintf(stderr,
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51 "error: non-understood backslash escape\n");
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52 return(-1);
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53 }
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54 }
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55 c = gsm7_encode_table[c];
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56 if (c == 0xFF) {
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57 fprintf(stderr,
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58 "error: character in alpha tag string cannot be encoded in GSM7\n");
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59 return(-1);
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60 }
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61 bypass_encoding:
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62 if (c & 0x80)
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63 nadd = 2;
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64 else
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65 nadd = 1;
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66 if (acclen + nadd > maxlen) {
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67 fprintf(stderr,
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68 "error: alpha tag string is longer than SIM limit\n");
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69 return(-1);
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70 }
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71 if (c & 0x80)
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72 record[acclen++] = 0x1B;
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73 record[acclen++] = c & 0x7F;
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74 }
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75 return(acclen);
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76 }