Rewrite cp(1).
This commit is contained in:
parent
4e095906fb
commit
fab7b7dfc8
447
utils/cp.cpp
447
utils/cp.cpp
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@ -1,6 +1,6 @@
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/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2011, 2013.
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Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013.
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This program is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the Free
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@ -21,60 +21,427 @@
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*******************************************************************************/
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <dirent.h>
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#include <errno.h>
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#include <error.h>
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#include <fcntl.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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const char* basename(const char* path)
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#if !defined(VERSIONSTR)
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#define VERSIONSTR "unknown version"
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#endif
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const char* BaseName(const char* path)
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{
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size_t len = strlen(path);
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while ( len-- ) { if ( path[len] == '/' ) { return path + len + 1; } }
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return path;
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}
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int main(int argc, char* argv[])
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char* AddElemToPath(const char* path, const char* elem)
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{
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if ( argc != 3 ) { printf("usage: %s <from> <to>\n", argv[0]); return 0; }
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const char* frompath = argv[1];
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const char* topath = argv[2];
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int fromfd = open(frompath, O_RDONLY);
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if ( fromfd < 0 ) { error(1, errno, "%s", frompath); return 1; }
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int tofd = open(topath, O_WRONLY | O_TRUNC | O_CREAT, 0777);
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if ( tofd < 0 )
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error(1, errno, "%s", topath);
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struct stat st;
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if ( fstat(tofd, &st) )
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error(1, errno, "stat: %s", topath);
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if ( S_ISDIR(st.st_mode) )
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size_t pathlen = strlen(path);
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size_t elemlen = strlen(elem);
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if ( pathlen && path[pathlen-1] == '/' )
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{
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int dirfd = tofd;
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const char* name = basename(frompath);
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tofd = openat(dirfd, name, O_WRONLY | O_TRUNC | O_CREAT, 0777);
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close(dirfd);
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if ( tofd < 0 )
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error(1, errno, "%s/%s", topath, name);
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char* ret = (char*) malloc(sizeof(char) * (pathlen + elemlen + 1));
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stpcpy(stpcpy(ret, path), elem);
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return ret;
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}
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char* ret = (char*) malloc(sizeof(char) * (pathlen + 1 + elemlen + 1));
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stpcpy(stpcpy(stpcpy(ret, path), "/"), elem);
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return ret;
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}
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while ( true )
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void CompactArguments(int* argc, char*** argv)
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{
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for ( int i = 0; i < *argc; i++ )
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while ( i < *argc && !(*argv)[i] )
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{
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const size_t BUFFER_SIZE = 4096;
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char buffer[BUFFER_SIZE];
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ssize_t bytesread = read(fromfd, buffer, BUFFER_SIZE);
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if ( bytesread < 0 ) { error(1, errno, "read: %s", frompath); return 1; }
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if ( bytesread == 0 ) { return 0; }
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if ( writeall(tofd, buffer, bytesread) < (size_t) bytesread )
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{
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error(1, errno, "write: %s", topath);
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return 1;
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}
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for ( int n = i; n < *argc; n++ )
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(*argv)[n] = (*argv)[n+1];
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(*argc)--;
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}
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}
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const int FLAG_RECURSIVE = 1 << 0;
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const int FLAG_VERBOSE = 1 << 1;
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const int FLAG_KEEP_GOING = 1 << 2;
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const int FLAG_TARGET_DIR = 1 << 3;
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const int FLAG_NO_TARGET_DIR = 1 << 4;
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const int FLAG_UPDATE = 1 << 5;
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const int FLAG_NO_DEREFERENCE = 1 << 6;
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bool CopyFileContents(int srcfd, const char* srcpath,
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int dstfd, const char* dstpath, int flags);
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bool CopyDirectoryContents(int srcfd, const char* srcpath,
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int dstfd, const char* dstpath, int flags);
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bool CopyToDest(int srcdirfd, const char* srcrel, const char* srcpath,
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int dstdirfd, const char* dstrel, const char* dstpath,
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int flags);
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bool CopyIntoDirectory(int srcdirfd, const char* srcrel, const char* srcpath,
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int dstdirfd, const char* dstrel, const char* dstpath,
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int flags);
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bool CopyAmbigious(int srcdirfd, const char* srcrel, const char* srcpath,
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int dstdirfd, const char* dstrel, const char* dstpath,
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int flags);
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bool CopyFileContents(int srcfd, const char* srcpath,
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int dstfd, const char* dstpath, int flags)
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{
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struct stat srcst, dstst;
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if ( fstat(srcfd, &srcst) )
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{
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error(0, errno, "stat: %s", srcpath);
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return false;
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}
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if ( fstat(dstfd, &dstst) )
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{
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error(0, errno, "stat: %s", dstpath);
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return false;
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}
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if ( srcst.st_dev == dstst.st_dev && srcst.st_ino == dstst.st_ino )
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{
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error(0, 0, "`%s' and `%s' are the same file", srcpath, dstpath);
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return false;
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}
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if ( S_ISDIR(dstst.st_mode) )
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{
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error(0, 0, "cannot overwrite directory `%s' with non-directory",
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dstpath);
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return false;
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}
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if ( lseek(srcfd, 0, SEEK_SET) )
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{
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error(0, errno, "can't seek: %s", srcpath);
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return false;
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}
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if ( lseek(dstfd, 0, SEEK_SET) )
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{
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error(0, errno, "can't seek: %s", dstpath);
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return false;
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}
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if ( flags & FLAG_VERBOSE )
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printf("`%s' -> `%s'\n", srcpath, dstpath);
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ftruncate(dstfd, srcst.st_size);
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size_t BUFFER_SIZE = 16 * 1024;
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uint8_t buffer[BUFFER_SIZE];
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while ( true )
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{
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ssize_t numbytes = read(srcfd, buffer, BUFFER_SIZE);
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if ( numbytes == 0 )
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break;
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if ( numbytes < 0 )
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{
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error(0, errno, "read: %s", srcpath);
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return false;
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}
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size_t sofar = 0;
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while ( sofar < (size_t) numbytes )
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{
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ssize_t amount = write(dstfd, buffer + sofar, numbytes - sofar);
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if ( amount <= 0 )
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{
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error(0, errno, "write: %s", dstpath);
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return false;
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}
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sofar += amount;
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}
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}
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return true;
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}
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bool CopyDirectoryContentsInner(DIR* srcdir, const char* srcpath,
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DIR* dstdir, const char* dstpath, int flags)
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{
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if ( flags & FLAG_VERBOSE )
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printf("`%s' -> `%s'\n", srcpath, dstpath);
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bool ret = true;
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struct dirent* entry;
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while ( (entry = readdir(srcdir)) )
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{
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const char* name = entry->d_name;
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if ( !strcmp(name, ".") || !strcmp(name, "..") )
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continue;
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char* srcpath_new = AddElemToPath(srcpath, name);
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char* dstpath_new = AddElemToPath(dstpath, name);
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bool ok = CopyToDest(dirfd(srcdir), name, srcpath_new,
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dirfd(dstdir), name, dstpath_new, flags);
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free(srcpath_new);
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free(dstpath_new);
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if ( !ok )
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{
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ret = false;
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if ( !(flags & FLAG_KEEP_GOING) )
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break;
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}
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}
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return ret;
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}
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bool CopyDirectoryContentsOuter(int srcfd, const char* srcpath,
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int dstfd, const char* dstpath, int flags)
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{
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struct stat srcst, dstst;
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if ( fstat(srcfd, &srcst) )
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{
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error(0, errno, "stat: %s", srcpath);
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return false;
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}
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if ( fstat(dstfd, &dstst) )
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{
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error(0, errno, "stat: %s", dstpath);
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}
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if ( srcst.st_dev == dstst.st_dev && srcst.st_ino == dstst.st_ino )
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{
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error(0, 0, "error: `%s' and `%s' are the same file", srcpath, dstpath);
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return false;
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}
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DIR* srcdir = fdopendir(srcfd);
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if ( !srcdir ) { perror("fdopendir"); return false; }
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DIR* dstdir = fdopendir(dstfd);
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if ( !dstdir ) { perror("fdopendir"); closedir(srcdir); return false; }
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bool ret = CopyDirectoryContentsInner(srcdir, srcpath, dstdir, dstpath,
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flags);
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closedir(dstdir);
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closedir(srcdir);
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return ret;
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}
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bool CopyDirectoryContents(int srcfd, const char* srcpath,
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int dstfd, const char* dstpath, int flags)
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{
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int srcfd_copy = dup(srcfd);
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if ( srcfd_copy < 0 ) { perror("dup"); return false; }
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int dstfd_copy = dup(dstfd);
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if ( dstfd_copy < 0 ) { perror("dup"); close(srcfd_copy); return false; }
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bool ret = CopyDirectoryContentsOuter(srcfd_copy, srcpath,
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dstfd_copy, dstpath, flags);
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close(dstfd_copy);
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close(srcfd_copy);
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return ret;
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}
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bool CopyToDest(int srcdirfd, const char* srcrel, const char* srcpath,
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int dstdirfd, const char* dstrel, const char* dstpath,
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int flags)
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{
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struct stat srcst;
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bool ret = false;
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int srcfd = openat(srcdirfd, srcrel, O_RDONLY);
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if ( srcfd < 0 )
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{
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error(0, errno, "%s", srcpath);
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goto out_done;
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}
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if ( fstat(srcfd, &srcst) )
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{
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error(0, errno, "stat: %s", srcpath);
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goto out_cleanup_srcfd;
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}
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if ( S_ISDIR(srcst.st_mode) )
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{
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if ( !(flags & FLAG_RECURSIVE) )
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{
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error(0, 0, "omitting directory `%s'", srcpath);
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goto out_cleanup_srcfd;
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}
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int dstfd = openat(dstdirfd, dstrel, O_RDONLY | O_DIRECTORY);
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if ( dstfd < 0 )
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{
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if ( errno != ENOENT )
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{
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error(0, errno, "%s", dstpath);
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goto out_cleanup_srcfd;
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}
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if ( mkdirat(dstdirfd, dstrel, srcst.st_mode & 03777) )
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{
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error(0, errno, "cannot create directory `%s'", dstpath);
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goto out_cleanup_srcfd;
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}
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if ( (dstfd = openat(dstdirfd, dstrel, O_RDONLY | O_DIRECTORY)) < 0 )
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{
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error(0, errno, "%s", dstpath);
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goto out_cleanup_srcfd;
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}
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}
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ret = CopyDirectoryContents(srcfd, srcpath, dstfd, dstpath, flags);
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close(dstfd);
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}
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else
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{
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int dstfd = openat(dstdirfd, dstrel, O_WRONLY | O_CREAT, srcst.st_mode & 03777);
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if ( dstfd < 0 )
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{
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error(0, errno, "%s", dstpath);
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goto out_cleanup_srcfd;
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}
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ret = CopyFileContents(srcfd, srcpath, dstfd, dstpath, flags);
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close(dstfd);
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}
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out_cleanup_srcfd:
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close(srcfd);
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out_done:
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return ret;
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}
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bool CopyIntoDirectory(int srcdirfd, const char* srcrel, const char* srcpath,
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int dstdirfd, const char* dstrel, const char* dstpath,
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int flags)
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{
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const char* src_basename = BaseName(srcrel);
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int dstfd = openat(dstdirfd, dstrel, O_RDONLY | O_DIRECTORY);
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if ( dstfd < 0 )
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{
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error(0, errno, "%s", dstpath);
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return false;
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}
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char* dstpath_new = AddElemToPath(dstpath, src_basename);
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bool ret = CopyToDest(srcdirfd, srcrel, srcpath,
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dstfd, src_basename, dstpath_new, flags);
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free(dstpath_new);
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return ret;
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}
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bool CopyAmbigious(int srcdirfd, const char* srcrel, const char* srcpath,
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int dstdirfd, const char* dstrel, const char* dstpath,
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int flags)
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{
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struct stat dstst;
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if ( fstatat(dstdirfd, dstrel, &dstst, 0) )
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{
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if ( errno != ENOENT )
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{
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error(0, errno, "%s", dstpath);
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return false;
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}
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dstst.st_mode = S_IFREG;
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}
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if ( S_ISDIR(dstst.st_mode) )
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return CopyIntoDirectory(srcdirfd, srcrel, srcpath,
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dstdirfd, dstrel, dstpath, flags);
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else
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return CopyToDest(srcdirfd, srcrel, srcpath,
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dstdirfd, dstrel, dstpath, flags);
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}
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void Usage(FILE* fp, const char* argv0)
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{
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fprintf(fp, "Usage: %s [OPTION]... [-T] SOURCE DEST\n", argv0);
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fprintf(fp, " or: %s [OPTION]... SOURCE... DIRECTORY\n", argv0);
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fprintf(fp, " or: %s [OPTION]... -t DIRECTORY SOURCE...\n", argv0);
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fprintf(fp, "Copy SOURCE to DEST, or multiple SOURCE(s) to DIRECTORY.\n");
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}
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void Help(FILE* fp, const char* argv0)
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{
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Usage(fp, argv0);
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}
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void Version(FILE* fp, const char* argv0)
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{
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fprintf(fp, "%s (Sortix) %s\n", argv0, VERSIONSTR);
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fprintf(fp, "License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.\n");
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fprintf(fp, "This is free software: you are free to change and redistribute it.\n");
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fprintf(fp, "There is NO WARRANTY, to the extent permitted by law.\n");
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}
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int main(int argc, char* argv[])
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{
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const char* argv0 = argv[0];
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int flags = FLAG_KEEP_GOING;
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for ( int i = 1; i < argc; i++ )
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{
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const char* arg = argv[i];
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if ( arg[0] != '-' )
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continue;
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argv[i] = NULL;
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if ( !strcmp(arg, "--") )
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break;
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if ( arg[1] != '-' )
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{
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while ( char c = *++arg ) switch ( c )
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{
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case 'r':
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case 'R': flags |= FLAG_RECURSIVE; break;
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case 'v': flags |= FLAG_VERBOSE; break;
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case 't': flags |= FLAG_TARGET_DIR; break;
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case 'T': flags |= FLAG_NO_TARGET_DIR; break;
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case 'u': flags |= FLAG_UPDATE; break;
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case 'P': flags |= FLAG_NO_DEREFERENCE; break;
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default:
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fprintf(stderr, "%s: unknown option -- '%c'\n", argv0, c);
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Usage(stderr, argv0);
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exit(1);
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}
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}
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else if ( !strcmp(arg, "--help") ) { Help(stdout, argv0); exit(0); }
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else if ( !strcmp(arg, "--usage") ) { Usage(stdout, argv0); exit(0); }
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else if ( !strcmp(arg, "--version") ) { Version(stdout, argv0); exit(0); }
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else if ( !strcmp(arg, "--recursive") )
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flags |= FLAG_RECURSIVE;
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else if ( !strcmp(arg, "--verbose") )
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flags |= FLAG_VERBOSE;
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else if ( !strcmp(arg, "--target-directory") )
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flags |= FLAG_TARGET_DIR;
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else if ( !strcmp(arg, "--no-target-directory") )
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flags |= FLAG_NO_TARGET_DIR;
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else if ( !strcmp(arg, "--update") )
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flags |= FLAG_UPDATE;
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else if ( !strcmp(arg, "--no-dereference") )
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flags |= FLAG_NO_DEREFERENCE;
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else
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{
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fprintf(stderr, "%s: unknown option: %s\n", argv0, arg);
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Usage(stderr, argv0);
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exit(1);
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}
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}
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if ( flags & FLAG_UPDATE )
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error(0, 0, "ignoring unsupported, but known -u, --update flag");
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if ( flags & FLAG_NO_DEREFERENCE )
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error(0, 0, "ignoring unsupported, but known -P, --no-dereference flag");
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CompactArguments(&argc, &argv);
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if ( flags & FLAG_NO_TARGET_DIR || argc <= 3 )
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{
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if ( argc < 2 )
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error(1, 0, "missing file operand");
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const char* src = argv[1];
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if ( argc < 3 )
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error(1, 0, "missing destination file operand after `%s'", src);
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const char* dst = argv[2];
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if ( 3 < argc )
|
||||
error(1, 0, "extra operand `%s'", argv[3]);
|
||||
if ( !(flags & FLAG_NO_TARGET_DIR) && argc == 3 )
|
||||
return CopyAmbigious(AT_FDCWD, src, src, AT_FDCWD, dst, dst, flags) ? 0 : 1;
|
||||
return CopyToDest(AT_FDCWD, src, src, AT_FDCWD, dst, dst, flags) ? 0 : 1;
|
||||
}
|
||||
|
||||
int dst_index = flags & FLAG_TARGET_DIR ? 1 : argc-1;
|
||||
const char* dst = argv[dst_index]; argv[dst_index] = NULL;
|
||||
CompactArguments(&argc, &argv);
|
||||
|
||||
if ( argc < 2 )
|
||||
error(1, 0, "missing file operand");
|
||||
|
||||
bool success = true;
|
||||
for ( int i = 1; i < argc; i++ )
|
||||
{
|
||||
const char* src = argv[i];
|
||||
if ( !CopyIntoDirectory(AT_FDCWD, src, src, AT_FDCWD, dst, dst, flags) )
|
||||
success = false;
|
||||
}
|
||||
|
||||
return success ? 0 : 1;
|
||||
}
|
||||
|
|
Loading…
Reference in New Issue