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Diffstat (limited to 'subprojects/exess/src/read_utils.c')
-rw-r--r-- | subprojects/exess/src/read_utils.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/subprojects/exess/src/read_utils.c b/subprojects/exess/src/read_utils.c new file mode 100644 index 00000000..823fe97f --- /dev/null +++ b/subprojects/exess/src/read_utils.c @@ -0,0 +1,51 @@ +/* + Copyright 2019-2021 David Robillard <d@drobilla.net> + + Permission to use, copy, modify, and/or distribute this software for any + purpose with or without fee is hereby granted, provided that the above + copyright notice and this permission notice appear in all copies. + + THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. +*/ + +#include "read_utils.h" +#include "string_utils.h" + +#include "exess/exess.h" + +ExessResult +read_two_digit_number(uint8_t* const out, + const uint8_t min_value, + const uint8_t max_value, + const char* const str) +{ + size_t i = 0; + + // Read digits + size_t d = 0; + for (; d < 2; ++d, ++i) { + if (is_digit(str[i])) { + *out = (uint8_t)((*out * 10) + (str[i] - '0')); + } else { + break; + } + } + + // Ensure there are exactly the expected number of digits + if (d != 2) { + return result(EXESS_EXPECTED_DIGIT, i); + } + + // Ensure value is in range + if (*out < min_value || *out > max_value) { + return result(EXESS_OUT_OF_RANGE, i); + } + + return result(EXESS_SUCCESS, i); +} |