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/*
*
* Copyright 2018 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include <grpc/support/port_platform.h>
#include "src/core/lib/security/credentials/alts/check_gcp_environment.h"
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
const size_t kBiosDataBufferSize = 256;
static char* trim(const char* src) {
if (src == nullptr) {
return nullptr;
}
char* des = nullptr;
size_t start = 0, end = strlen(src) - 1;
/* find the last character that is not a whitespace. */
while (end != 0 && isspace(src[end])) {
end--;
}
/* find the first character that is not a whitespace. */
while (start < strlen(src) && isspace(src[start])) {
start++;
}
if (start <= end) {
des = static_cast<char*>(
gpr_zalloc(sizeof(char) * (end - start + 2 /* '\0' */)));
memcpy(des, src + start, end - start + 1);
}
return des;
}
namespace grpc_core {
namespace internal {
char* read_bios_file(const char* bios_file) {
FILE* fp = fopen(bios_file, "r");
if (!fp) {
gpr_log(GPR_ERROR, "BIOS data file cannot be opened.");
return nullptr;
}
char buf[kBiosDataBufferSize + 1];
size_t ret = fread(buf, sizeof(char), kBiosDataBufferSize, fp);
buf[ret] = '\0';
char* trimmed_buf = trim(buf);
fclose(fp);
return trimmed_buf;
}
} // namespace internal
} // namespace grpc_core
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