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ef35fa7374
clang-format version 17.0.6 (taskcluster-QueHFUviQeyM8Y7r_d7MQQ) # ignore-this-changeset Differential Revision: https://phabricator.services.mozilla.com/D195397
111 lines
2.6 KiB
C++
111 lines
2.6 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* Interposing getline because of
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* https://bugzilla.mozilla.org/show_bug.cgi?id=914190
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*/
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#ifdef __ANDROID__
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# include <cstdlib>
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# include <cstdio>
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# include <cerrno>
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# include <limits>
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namespace {
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// RAII on file locking.
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class FileLocker {
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FILE* stream;
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public:
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explicit FileLocker(FILE* stream) : stream(stream) { flockfile(stream); }
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~FileLocker() { funlockfile(stream); }
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};
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ssize_t internal_getdelim(char** __restrict lineptr, size_t* __restrict n,
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int delim, FILE* __restrict stream) {
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constexpr size_t n_default = 64;
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constexpr size_t n_max =
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std::numeric_limits<ssize_t>::max() < std::numeric_limits<size_t>::max()
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? (size_t)std::numeric_limits<ssize_t>::max() + 1
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: std::numeric_limits<size_t>::max();
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constexpr size_t n_limit = 2 * ((n_max - 1) / 3);
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if (!lineptr || !n || !stream) {
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errno = EINVAL;
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return -1;
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}
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// Lock the file so that we can us unlocked getc in the inner loop.
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FileLocker fl(stream);
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if (!*lineptr || *n == 0) {
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*n = n_default;
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if (auto* new_lineptr = reinterpret_cast<char*>(realloc(*lineptr, *n))) {
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*lineptr = new_lineptr;
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} else {
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errno = ENOMEM;
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return -1;
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}
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}
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ssize_t result;
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size_t cur_len = 0;
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while (true) {
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// Retrieve an extra char.
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int i = getc_unlocked(stream);
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if (i == EOF) {
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result = -1;
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break;
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}
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// Eventually grow the buffer.
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if (cur_len + 1 >= *n) {
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size_t needed = *n >= n_limit ? n_max : 3 * *n / 2 + 1;
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if (cur_len + 1 >= needed) {
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errno = EOVERFLOW;
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return -1;
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}
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if (auto* new_lineptr = (char*)realloc(*lineptr, needed)) {
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*lineptr = new_lineptr;
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} else {
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errno = ENOMEM;
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return -1;
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}
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*n = needed;
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}
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(*lineptr)[cur_len] = i;
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cur_len++;
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if (i == delim) break;
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}
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(*lineptr)[cur_len] = '\0';
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return cur_len ? cur_len : result;
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}
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} // namespace
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extern "C" {
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MFBT_API ssize_t getline(char** __restrict lineptr, size_t* __restrict n,
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FILE* __restrict stream) {
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return internal_getdelim(lineptr, n, '\n', stream);
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}
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MFBT_API ssize_t getdelim(char** __restrict lineptr, size_t* __restrict n,
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int delim, FILE* __restrict stream) {
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return internal_getdelim(lineptr, n, delim, stream);
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}
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} // extern "C"
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#endif
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