diff options
Diffstat (limited to 'src/gsm/gsm48_ie.c')
| -rw-r--r-- | src/gsm/gsm48_ie.c | 28 |
1 files changed, 27 insertions, 1 deletions
diff --git a/src/gsm/gsm48_ie.c b/src/gsm/gsm48_ie.c index ffe3ebae..049f5dc6 100644 --- a/src/gsm/gsm48_ie.c +++ b/src/gsm/gsm48_ie.c @@ -46,7 +46,7 @@ static const char bcd_num_digits[] = { '8', '9', '*', '#', 'a', 'b', 'c', '\0' }; -/*! decode a 'called/calling/connect party BCD number' as in 10.5.4.7 +/*! Like gsm48_decode_bcd_number2() but with less airtight bounds checking. * \param[out] Caller-provided output buffer * \param[in] bcd_lv Length-Value portion of to-be-decoded IE * \param[in] h_len Length of an optional heder between L and V portion @@ -76,6 +76,32 @@ int gsm48_decode_bcd_number(char *output, int output_len, return 0; } +/*! Decode a 'called/calling/connect party BCD number' as in 10.5.4.7. + * \param[out] output Caller-provided output buffer. + * \param[in] output_len sizeof(output). + * \param[in] bcd_lv Length-Value part of to-be-decoded IE. + * \param[in] input_len Size of the buffer to read the IE from. + * \param[in] h_len Length of an optional header between L and V parts. + * \return 0 in case of success, negative on error. Errors checked: no or too little input data, no or too little + * output buffer size, IE length exceeds input data size, decoded number exceeds size of the output buffer. The output + * is guaranteed to be nul terminated iff output_len > 0. + */ +int gsm48_decode_bcd_number2(char *output, size_t output_len, + const uint8_t *bcd_lv, size_t input_len, + size_t h_len) +{ + uint8_t len; + if (output_len < 1) + return -ENOSPC; + *output = '\0'; + if (input_len < 1) + return -EIO; + len = bcd_lv[0]; + if (input_len < len) + return -EIO; + return gsm48_decode_bcd_number(output, output_len, bcd_lv, h_len); +} + /*! convert a single ASCII character to call-control BCD */ static int asc_to_bcd(const char asc) { |