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comparison uptools/libcoding/decode_helpers.c @ 328:978571e23318

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uptools started with libcoding
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 03 Feb 2018 20:07:05 +0000
parents
children 1c599681fd60
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327:973d885a68a0 328:978571e23318
1 /*
2 * This library module implements the is_decoded_char_ok() and emit_utf8_char()
3 * functions used by gsm7_to_ascii_or_ext() and ucs2_to_ascii_or_ext().
4 */
5
6 #include <sys/types.h>
7
8 is_decoded_char_ok(uni, ascii_ext)
9 unsigned uni;
10 {
11 unsigned upper_limit;
12
13 /* weed out control chars first */
14 if (uni < 0x20)
15 return(0);
16 if (uni >= 0x7F && uni <= 0x9F)
17 return(0);
18 /* see what range our output encoding allows */
19 switch (ascii_ext) {
20 case 0:
21 upper_limit = 0x7F;
22 break;
23 case 1:
24 upper_limit = 0xFF;
25 break;
26 case 2:
27 upper_limit = 0xFFFF;
28 break;
29 default:
30 upper_limit = 0;
31 }
32 if (uni <= upper_limit)
33 return(1);
34 else
35 return(0);
36 }
37
38 emit_utf8_char(uni, outp)
39 unsigned uni;
40 u_char *outp;
41 {
42 if (uni < 0x80) {
43 *outp = uni;
44 return(1);
45 }
46 if (uni < 0x800) {
47 outp[0] = 0xC0 | (uni >> 6);
48 outp[1] = 0x80 | (uni & 0x3F);
49 return(2);
50 }
51 outp[0] = 0xE0 | (uni >> 12);
52 outp[1] = 0x80 | ((uni >> 6) & 0x3F);
53 outp[2] = 0x80 | (uni & 0x3F);
54 return(3);
55 }