59 lines
1.7 KiB
C++
59 lines
1.7 KiB
C++
// Copyright 2019 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// This file is an example of a binary which is intended to be sandboxed by the
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// sandbox2. It's not google3-based, and compiled statically (see BUILD).
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//
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// It inverts all bytes coming from stdin and writes them to the stdout.
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#include <sys/prctl.h>
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#include <unistd.h>
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#include <cctype>
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#include <cstdio>
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int main(int argc, char* argv[]) {
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char buf[1024];
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size_t total_bytes = 0U;
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prctl(PR_SET_NAME, "static_bin");
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fprintf(stderr, "=============================\n");
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fprintf(stderr, "Starting file capitalization\n");
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fprintf(stderr, "=============================\n");
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fflush(nullptr);
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for (;;) {
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ssize_t sz = read(STDIN_FILENO, buf, sizeof(buf));
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if (sz < 0) {
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perror("read");
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break;
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}
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if (sz == 0) {
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break;
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}
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for (int i = 0; i < sz; i++) {
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buf[i] = toupper(buf[i]);
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}
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write(STDOUT_FILENO, buf, sz);
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total_bytes += sz;
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}
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fprintf(stderr, "=============================\n");
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fprintf(stderr, "Converted: %zu bytes\n", total_bytes);
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fprintf(stderr, "=============================\n");
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fflush(nullptr);
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return 0;
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}
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