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comparison uptools/libcoding/utf8_decode.c @ 354:ec0d6d58e043

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uptools/libcoding: UTF-8 input conversion to 8859-1 implemented
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 05 Feb 2018 19:01:27 +0000
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353:3bcc56883b17 354:ec0d6d58e043
1 /*
2 * This library module implements a function that converts text input
3 * from UTF-8 to ISO 8859-1, rejecting any input Unicode characters
4 * that aren't in the 8859-1 range. The conversion in done in place.
5 */
6
7 #include <sys/types.h>
8
9 utf8_to_latin1(buf)
10 u_char *buf;
11 {
12 u_char *ip = buf, *op = buf;
13 int c, c2;
14
15 while (c = *ip++) {
16 if (c < 0x80) {
17 *op++ = c;
18 continue;
19 }
20 if (c != 0xC2 && c != 0xC3)
21 return(-1);
22 c2 = *ip++;
23 if (c2 < 0x80 || c2 > 0xBF)
24 return(-1);
25 *op++ = ((c & 3) << 6) | (c2 & 0x3F);
26 }
27 *op = '\0';
28 return(0);
29 }