FreeCalypso > hg > sms-coding-utils
annotate libcoding/utf8_decode.c @ 16:d9d722033ff1
sms-gen-tpdu: add support for first octet flags
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 27 Aug 2023 07:32:46 +0000 |
parents | 2d0082216916 |
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2d0082216916
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Mychaela Falconia <falcon@freecalypso.org>
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1 /* |
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2 * This library module implements a function that converts text input |
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3 * from UTF-8 to ISO 8859-1, rejecting any input Unicode characters |
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4 * that aren't in the 8859-1 range. The conversion in done in place. |
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Mychaela Falconia <falcon@freecalypso.org>
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5 */ |
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6 |
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7 #include <sys/types.h> |
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Mychaela Falconia <falcon@freecalypso.org>
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8 |
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9 utf8_to_latin1(buf) |
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10 u_char *buf; |
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Mychaela Falconia <falcon@freecalypso.org>
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11 { |
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12 u_char *ip = buf, *op = buf; |
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13 int c, c2; |
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14 |
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15 while (c = *ip++) { |
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16 if (c < 0x80) { |
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17 *op++ = c; |
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18 continue; |
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19 } |
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20 if (c != 0xC2 && c != 0xC3) |
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21 return(-1); |
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22 c2 = *ip++; |
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23 if (c2 < 0x80 || c2 > 0xBF) |
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24 return(-1); |
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25 *op++ = ((c & 3) << 6) | (c2 & 0x3F); |
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26 } |
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27 *op = '\0'; |
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28 return(0); |
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29 } |