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author | David Robillard <d@drobilla.net> | 2021-02-25 10:27:59 -0500 |
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committer | David Robillard <d@drobilla.net> | 2021-03-08 23:23:05 -0500 |
commit | c4821c8e6bf1f81c6ea31e11ebc0fc1666e9337b (patch) | |
tree | a62995534f5f606ac2f8bae22d525532b824cb5e /subprojects/exess/src/ulong.c | |
parent | 6bcd18ae60482790b645a345f718e7099250f261 (diff) | |
download | serd-c4821c8e6bf1f81c6ea31e11ebc0fc1666e9337b.tar.gz serd-c4821c8e6bf1f81c6ea31e11ebc0fc1666e9337b.tar.bz2 serd-c4821c8e6bf1f81c6ea31e11ebc0fc1666e9337b.zip |
Add exess from git@gitlab.com:drobilla/exess.git 4638b1f
Diffstat (limited to 'subprojects/exess/src/ulong.c')
-rw-r--r-- | subprojects/exess/src/ulong.c | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/subprojects/exess/src/ulong.c b/subprojects/exess/src/ulong.c new file mode 100644 index 00000000..3d9e00c9 --- /dev/null +++ b/subprojects/exess/src/ulong.c @@ -0,0 +1,94 @@ +/* + 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 "exess/exess.h" +#include "int_math.h" +#include "read_utils.h" +#include "string_utils.h" +#include "write_utils.h" + +#include <stdint.h> +#include <stdlib.h> + +ExessResult +exess_read_ulong(uint64_t* const out, const char* const str) +{ + *out = 0; + + // Ensure the first character is a digit + size_t i = skip_whitespace(str); + if (!is_digit(str[i])) { + return result(EXESS_EXPECTED_DIGIT, i); + } + + // Skip leading zeros + int n_zeroes = 0; + while (str[i] == '0') { + ++i; + ++n_zeroes; + } + + // Read digits + for (; is_digit(str[i]); ++i) { + const uint64_t next = (*out * 10u) + (uint64_t)(str[i] - '0'); + if (next < *out) { + *out = 0; + return result(EXESS_OUT_OF_RANGE, i); + } + + *out = next; + } + + return end_read(EXESS_SUCCESS, str, i); +} + +ExessResult +write_digits(const uint64_t value, + const size_t buf_size, + char* const buf, + const size_t i) +{ + const uint8_t n_digits = exess_num_digits(value); + if (!buf) { + return result(EXESS_SUCCESS, n_digits); + } + + if (i + n_digits >= buf_size) { + return end_write(EXESS_NO_SPACE, buf_size, buf, 0); + } + + // Point s to the end + char* s = buf + i + n_digits - 1u; + + // Write integer part (right to left) + uint64_t remaining = value; + do { + *s-- = (char)('0' + (remaining % 10)); + } while ((remaining /= 10) > 0); + + return result(EXESS_SUCCESS, n_digits); +} + +ExessResult +exess_write_ulong(const uint64_t value, const size_t buf_size, char* const buf) +{ + if (!buf) { + return result(EXESS_SUCCESS, exess_num_digits(value)); + } + + const ExessResult r = write_digits(value, buf_size, buf, 0); + return end_write(r.status, buf_size, buf, r.count); +} |