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Merge pull request #765 from lioncash/file

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file_util: Remove goto usages from Copy()
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bunnei 2018-07-22 00:03:35 -07:00 committed by GitHub
commit 258a5cee84
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1 changed files with 14 additions and 24 deletions
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38
src/common/file_util.cpp
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@ -2,6 +2,8 @@
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <array>
#include <memory>
#include <sstream>
#include <unordered_map>
#include "common/assert.h"
@ -275,14 +277,10 @@ bool Copy(const std::string& srcFilename, const std::string& destFilename) {
GetLastErrorMsg());
return false;
#else
// buffer size
#define BSIZE 1024
char buffer[BSIZE];
using CFilePointer = std::unique_ptr<FILE, decltype(&std::fclose)>;
// Open input file
FILE* input = fopen(srcFilename.c_str(), "rb");
CFilePointer input{fopen(srcFilename.c_str(), "rb"), std::fclose};
if (!input) {
LOG_ERROR(Common_Filesystem, "opening input failed {} --> {}: {}", srcFilename,
destFilename, GetLastErrorMsg());
@ -290,44 +288,36 @@ bool Copy(const std::string& srcFilename, const std::string& destFilename) {
}
// open output file
FILE* output = fopen(destFilename.c_str(), "wb");
CFilePointer output{fopen(destFilename.c_str(), "wb"), std::fclose};
if (!output) {
fclose(input);
LOG_ERROR(Common_Filesystem, "opening output failed {} --> {}: {}", srcFilename,
destFilename, GetLastErrorMsg());
return false;
}
// copy loop
while (!feof(input)) {
std::array<char, 1024> buffer;
while (!feof(input.get())) {
// read input
size_t rnum = fread(buffer, sizeof(char), BSIZE, input);
if (rnum != BSIZE) {
if (ferror(input) != 0) {
size_t rnum = fread(buffer.data(), sizeof(char), buffer.size(), input.get());
if (rnum != buffer.size()) {
if (ferror(input.get()) != 0) {
LOG_ERROR(Common_Filesystem, "failed reading from source, {} --> {}: {}",
srcFilename, destFilename, GetLastErrorMsg());
goto bail;
return false;
}
}
// write output
size_t wnum = fwrite(buffer, sizeof(char), rnum, output);
size_t wnum = fwrite(buffer.data(), sizeof(char), rnum, output.get());
if (wnum != rnum) {
LOG_ERROR(Common_Filesystem, "failed writing to output, {} --> {}: {}", srcFilename,
destFilename, GetLastErrorMsg());
goto bail;
return false;
}
}
// close files
fclose(input);
fclose(output);
return true;
bail:
if (input)
fclose(input);
if (output)
fclose(output);
return false;
#endif
}