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Copy file content into new file if they're different and writeUpdate() is called

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This commit is contained in:
Grégory Soutadé 2022-03-14 19:56:50 +01:00
parent 6be1a4707f
commit ea37dcbded
2 changed files with 21 additions and 1 deletions
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20
src/uPDFParser.cpp
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@ -792,11 +792,31 @@ namespace uPDFParser
void Parser::writeUpdate(const std::string& filename) void Parser::writeUpdate(const std::string& filename)
{ {
struct stat _stat;
int statRet = stat(filename.c_str(), &_stat);
int newFd = open(filename.c_str(), O_WRONLY|O_APPEND|O_CREAT, S_IRUSR|S_IWUSR); int newFd = open(filename.c_str(), O_WRONLY|O_APPEND|O_CREAT, S_IRUSR|S_IWUSR);
if (newFd <= 0) if (newFd <= 0)
EXCEPTION(UNABLE_TO_OPEN_FILE, "Unable to open " << filename << " (%m)"); EXCEPTION(UNABLE_TO_OPEN_FILE, "Unable to open " << filename << " (%m)");
// Copy file if it doesn't exists
if (statRet == -1 && errno == ENOENT)
{
char buffer[4096];
int ret;
lseek(fd, 0, SEEK_SET);
while (true)
{
ret = ::read(fd, buffer, sizeof(buffer));
if (ret <= 0)
break;
::write(newFd, buffer, ret);
}
}
::write(newFd, "\r", 1); ::write(newFd, "\r", 1);
std::stringstream xref; std::stringstream xref;