FreeCalypso > hg > sms-coding-utils
comparison libcoding/check_high_bit.c @ 12:0fe95ca922c7
sms-gen-tpdu: check the high bit of GSM7 msg input
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sat, 05 Aug 2023 16:55:24 +0000 |
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11:9ed03ed4e673 | 12:0fe95ca922c7 |
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1 /* | |
2 * The function implemented in this module is intended for validating inputs | |
3 * that are expected to be in the form of GSM7 characters carried in an octet | |
4 * string, where the high bit of every octet is expected to be cleared. | |
5 */ | |
6 | |
7 #include <sys/types.h> | |
8 | |
9 check_high_bit(buf, len) | |
10 u_char *buf; | |
11 unsigned len; | |
12 { | |
13 unsigned n; | |
14 | |
15 for (n = 0; n < len; n++) { | |
16 if (buf[n] & 0x80) | |
17 return(-1); | |
18 } | |
19 return(0); | |
20 } |