FreeCalypso > hg > sms-coding-utils

annotate libcoding/utf8_decode2.c @ 31:19476164c54d

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doc/SMS-PDU-decoding: document imported utilities
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 14 Jun 2024 18:48:58 +0000
parents e56bb9f09ff1
children
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1 /*
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2 * This library module implements the function for converting UTF-8 input
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3 * to UCS-2 in outgoing SMS composition.
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4 */
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5
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6 #include <sys/types.h>
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7 #include <ctype.h>
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8
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9 static int
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10 handle_escape(ipp, outp)
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11 u_char **ipp;
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12 unsigned *outp;
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13 {
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14 unsigned c, n, acc;
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15
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16 c = *(*ipp)++;
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17 switch (c) {
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18 case '"':
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19 case '\\':
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20 *outp = c;
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21 return(0);
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22 case 'n':
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23 *outp = '\n';
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24 return(0);
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25 case 'r':
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26 *outp = '\r';
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27 return(0);
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28 case 'u':
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29 acc = 0;
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30 for (n = 0; n < 4; n++) {
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31 c = *(*ipp)++;
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32 if (!isxdigit(c))
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33 return(-3);
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34 acc <<= 4;
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35 acc |= decode_hex_digit(c);
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36 }
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37 *outp = acc;
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38 return(0);
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39 default:
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40 return(-3);
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41 }
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42 }
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43
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44 utf8_to_ucs2(inbuf, outbuf, outmax, outlenp, allow_escape)
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45 u_char *inbuf;
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46 u_short *outbuf;
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47 unsigned outmax, *outlenp;
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48 {
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49 u_char *ip = inbuf;
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50 u_short *op = outbuf;
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51 unsigned outcnt = 0, c, n, uni;
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52 int rc;
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53
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54 while (c = *ip++) {
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55 if (c == '\\' && allow_escape) {
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56 rc = handle_escape(&ip, &uni);
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57 if (rc < 0)
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58 return(rc);
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59 goto gotuni;
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60 }
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61 if (c < 0x80) {
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62 uni = c;
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63 goto gotuni;
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64 }
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65 if (c < 0xC0 || c > 0xEF)
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66 return(-1);
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67 uni = c & 0x1F;
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68 if (c >= 0xE0)
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69 n = 2;
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70 else
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71 n = 1;
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72 for (; n; n--) {
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73 c = *ip++;
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74 if (c < 0x80 || c > 0xBF)
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75 return(-1);
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76 uni <<= 6;
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77 uni |= c & 0x3F;
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78 }
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79 gotuni: if (outcnt >= outmax)
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80 return(-2);
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81 *op++ = uni;
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82 outcnt++;
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83 }
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84 *outlenp = outcnt;
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85 return(0);
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86 }