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libmrbesen
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copy

This commit is contained in:
mrbesen 2020-11-03 21:02:16 +01:00
parent b541bbebcc
commit 630ca77b98
Signed by: MrBesen
GPG Key ID: 596B2350DCD67504
2 changed files with 40 additions and 0 deletions
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3
inc/files.h
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@ -33,4 +33,7 @@ bool scan(const std::string& path, fileCallback clb, bool prefixdir = false, fil
bool readFile(const std::string& name, std::ostream& output, unsigned int maxsize = 0); //reads file name and writes it line for line into output, it stops at maxsize (it might be a bit more, its not a hard limit - see it more as a hint), if maxsize is 0 it reads unlimited
bool readFile(int fd, std::ostream& output, unsigned int maxsize = 0);
bool copy(int fd_from, int fd_to);
bool copy(const std::string& from, const std::string& to);
}

37
src/files.cpp
View File

@ -7,6 +7,7 @@
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "util.h"
@ -108,3 +109,39 @@ bool mrbesen::files::readFile(int fd, std::ostream& output, unsigned int maxsize
return true;
}
bool mrbesen::files::copy(int fd_from, int fd_to) {
static const uint32_t BUFFERSIZE = 4096;
char buf[BUFFERSIZE];
ssize_t rc = -1;
while(rc) {
rc = read(fd_from, buf, BUFFERSIZE);
if(rc < 0) return false; //reading error
if(rc > 0) {
ssize_t wc = write(fd_to, buf, rc);
if(wc != rc) return false; //writing error
}
}
return true;
}
bool mrbesen::files::copy(const std::string& from, const std::string& to) {
int fd1 = open(from.c_str(), O_RDONLY);
if(fd1 < 0) return false;
struct stat sb;
if(fstat(fd1, &sb)) {
close(fd1);
return false;
}
int fd2 = open(to.c_str(), O_WRONLY | O_CREAT, sb.st_mode);
bool r = false;
if(fd2 > -1)
r = copy(fd1, fd2);
close(fd1);
close(fd2);
return r;
}