FreeCalypso > hg > sms-coding-utils

annotate libcoding/utf8_decode2.c @ 0:2d0082216916

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libcoding: beginning with a subset of uptools version
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 05 Aug 2023 00:46:23 +0000
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children e56bb9f09ff1
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2d0082216916 libcoding: beginning with a subset of uptools version
Mychaela Falconia <falcon@freecalypso.org>
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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
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8 utf8_to_ucs2(inbuf, outbuf, outmax, outlenp)
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9 u_char *inbuf;
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10 u_short *outbuf;
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11 unsigned outmax, *outlenp;
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12 {
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13 u_char *ip = inbuf;
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14 u_short *op = outbuf;
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15 unsigned outcnt = 0, c, n, uni;
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16
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17 while (c = *ip++) {
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18 if (c < 0x80) {
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19 uni = c;
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20 goto gotuni;
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21 }
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22 if (c < 0xC0 || c > 0xEF)
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23 return(-1);
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24 uni = c & 0x1F;
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25 if (c >= 0xE0)
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26 n = 2;
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27 else
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28 n = 1;
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29 for (; n; n--) {
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30 c = *ip++;
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31 if (c < 0x80 || c > 0xBF)
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32 return(-1);
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33 uni <<= 6;
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34 uni |= c & 0x3F;
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35 }
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36 gotuni: if (outcnt >= outmax)
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37 return(-2);
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38 *op++ = uni;
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39 outcnt++;
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40 }
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41 *outlenp = outcnt;
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42 return(0);
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43 }