FreeCalypso > hg > sms-coding-utils
view libcoding/check_high_bit.c @ 19:6a1a436747e9
doc/Tool-workflow: document written
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Sun, 27 Aug 2023 10:36:24 +0000 |
parents | 0fe95ca922c7 |
children |
line wrap: on
line source
/* * The function implemented in this module is intended for validating inputs * that are expected to be in the form of GSM7 characters carried in an octet * string, where the high bit of every octet is expected to be cleared. */ #include <sys/types.h> check_high_bit(buf, len) u_char *buf; unsigned len; { unsigned n; for (n = 0; n < len; n++) { if (buf[n] & 0x80) return(-1); } return(0); }