FreeCalypso > hg > sms-coding-utils

annotate libcoding/check_high_bit.c @ 31:19476164c54d

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doc/SMS-PDU-decoding: document imported utilities
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 14 Jun 2024 18:48:58 +0000
parents 0fe95ca922c7
children
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0fe95ca922c7 sms-gen-tpdu: check the high bit of GSM7 msg input
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
0fe95ca922c7 sms-gen-tpdu: check the high bit of GSM7 msg input
Mychaela Falconia <falcon@freecalypso.org>
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2 * The function implemented in this module is intended for validating inputs
0fe95ca922c7 sms-gen-tpdu: check the high bit of GSM7 msg input
Mychaela Falconia <falcon@freecalypso.org>
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3 * that are expected to be in the form of GSM7 characters carried in an octet
0fe95ca922c7 sms-gen-tpdu: check the high bit of GSM7 msg input
Mychaela Falconia <falcon@freecalypso.org>
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4 * string, where the high bit of every octet is expected to be cleared.
0fe95ca922c7 sms-gen-tpdu: check the high bit of GSM7 msg input
Mychaela Falconia <falcon@freecalypso.org>
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5 */
0fe95ca922c7 sms-gen-tpdu: check the high bit of GSM7 msg input
Mychaela Falconia <falcon@freecalypso.org>
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6
0fe95ca922c7 sms-gen-tpdu: check the high bit of GSM7 msg input
Mychaela Falconia <falcon@freecalypso.org>
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7 #include <sys/types.h>
0fe95ca922c7 sms-gen-tpdu: check the high bit of GSM7 msg input
Mychaela Falconia <falcon@freecalypso.org>
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8
0fe95ca922c7 sms-gen-tpdu: check the high bit of GSM7 msg input
Mychaela Falconia <falcon@freecalypso.org>
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9 check_high_bit(buf, len)
0fe95ca922c7 sms-gen-tpdu: check the high bit of GSM7 msg input
Mychaela Falconia <falcon@freecalypso.org>
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10 u_char *buf;
0fe95ca922c7 sms-gen-tpdu: check the high bit of GSM7 msg input
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11 unsigned len;
0fe95ca922c7 sms-gen-tpdu: check the high bit of GSM7 msg input
Mychaela Falconia <falcon@freecalypso.org>
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12 {
0fe95ca922c7 sms-gen-tpdu: check the high bit of GSM7 msg input
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13 unsigned n;
0fe95ca922c7 sms-gen-tpdu: check the high bit of GSM7 msg input
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14
0fe95ca922c7 sms-gen-tpdu: check the high bit of GSM7 msg input
Mychaela Falconia <falcon@freecalypso.org>
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15 for (n = 0; n < len; n++) {
0fe95ca922c7 sms-gen-tpdu: check the high bit of GSM7 msg input
Mychaela Falconia <falcon@freecalypso.org>
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16 if (buf[n] & 0x80)
0fe95ca922c7 sms-gen-tpdu: check the high bit of GSM7 msg input
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17 return(-1);
0fe95ca922c7 sms-gen-tpdu: check the high bit of GSM7 msg input
Mychaela Falconia <falcon@freecalypso.org>
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18 }
0fe95ca922c7 sms-gen-tpdu: check the high bit of GSM7 msg input
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19 return(0);
0fe95ca922c7 sms-gen-tpdu: check the high bit of GSM7 msg input
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20 }