FreeCalypso > hg > themwi-interim
diff libutil/dtmf_valid.c @ 1:b161dbfffdaa
include, libutil: port from old ThemWi
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Sat, 08 Jun 2024 23:06:53 +0000 |
| parents | |
| children |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/libutil/dtmf_valid.c Sat Jun 08 23:06:53 2024 +0000 @@ -0,0 +1,29 @@ +/* + * Here we implement a function that validates DTMF digits which arrive + * from GSM MS via MNCC_START_DTMF_IND. + */ + +is_valid_dtmf_digit(c) +{ + switch (c) { + case '0': + case '1': + case '2': + case '3': + case '4': + case '5': + case '6': + case '7': + case '8': + case '9': + case '*': + case '#': + case 'A': + case 'B': + case 'C': + case 'D': + return(1); + default: + return(0); + } +}