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- #include <u.h>
- #include <libc.h>
- #define DEFB (8*1024)
- int failed;
- int gflag;
- int uflag;
- int xflag;
- void copy(char *from, char *to, int todir);
- int copy1(int fdf, int fdt, char *from, char *to);
- void
- main(int argc, char *argv[])
- {
- Dir *dirb;
- int todir, i;
- ARGBEGIN {
- case 'g':
- gflag++;
- break;
- case 'u':
- uflag++;
- gflag++;
- break;
- case 'x':
- xflag++;
- break;
- default:
- goto usage;
- } ARGEND
- todir=0;
- if(argc < 2)
- goto usage;
- dirb = dirstat(argv[argc-1]);
- if(dirb!=nil && (dirb->mode&DMDIR))
- todir=1;
- if(argc>2 && !todir){
- fprint(2, "cp: %s not a directory\n", argv[argc-1]);
- exits("bad usage");
- }
- for(i=0; i<argc-1; i++)
- copy(argv[i], argv[argc-1], todir);
- if(failed)
- exits("errors");
- exits(0);
- usage:
- fprint(2, "usage:\tcp [-gux] fromfile tofile\n");
- fprint(2, "\tcp [-x] fromfile ... todir\n");
- exits("usage");
- }
- int
- samefile(Dir *a, char *an, char *bn)
- {
- Dir *b;
- int ret;
- ret = 0;
- b=dirstat(bn);
- if(b != nil)
- if(b->qid.type==a->qid.type)
- if(b->qid.path==a->qid.path)
- if(b->qid.vers==a->qid.vers)
- if(b->dev==a->dev)
- if(b->type==a->type){
- fprint(2, "cp: %s and %s are the same file\n", an, bn);
- ret = 1;
- }
- free(b);
- return ret;
- }
- void
- copy(char *from, char *to, int todir)
- {
- Dir *dirb, dirt;
- char name[256];
- int fdf, fdt, mode;
- if(todir){
- char *s, *elem;
- elem=s=from;
- while(*s++)
- if(s[-1]=='/')
- elem=s;
- sprint(name, "%s/%s", to, elem);
- to=name;
- }
- if((dirb=dirstat(from))==nil){
- fprint(2,"cp: can't stat %s: %r\n", from);
- failed = 1;
- return;
- }
- mode = dirb->mode;
- if(mode&DMDIR){
- fprint(2, "cp: %s is a directory\n", from);
- free(dirb);
- failed = 1;
- return;
- }
- if(samefile(dirb, from, to)){
- free(dirb);
- failed = 1;
- return;
- }
- mode &= 0777;
- fdf=open(from, OREAD);
- if(fdf<0){
- fprint(2, "cp: can't open %s: %r\n", from);
- free(dirb);
- failed = 1;
- return;
- }
- fdt=create(to, OWRITE, mode);
- if(fdt<0){
- fprint(2, "cp: can't create %s: %r\n", to);
- close(fdf);
- free(dirb);
- failed = 1;
- return;
- }
- if(copy1(fdf, fdt, from, to)==0 && (xflag || gflag || uflag)){
- nulldir(&dirt);
- if(xflag){
- dirt.mtime = dirb->mtime;
- dirt.mode = dirb->mode;
- }
- if(uflag)
- dirt.uid = dirb->uid;
- if(gflag)
- dirt.gid = dirb->gid;
- if(dirfwstat(fdt, &dirt) < 0)
- fprint(2, "cp: warning: can't wstat %s: %r\n", to);
- }
- free(dirb);
- close(fdf);
- close(fdt);
- }
- int
- copy1(int fdf, int fdt, char *from, char *to)
- {
- char *buf;
- long n, n1, rcount;
- int rv;
- char err[ERRMAX];
- buf = malloc(DEFB);
- /* clear any residual error */
- err[0] = '\0';
- errstr(err, ERRMAX);
- rv = 0;
- for(rcount=0;; rcount++) {
- n = read(fdf, buf, DEFB);
- if(n <= 0)
- break;
- n1 = write(fdt, buf, n);
- if(n1 != n) {
- fprint(2, "cp: error writing %s: %r\n", to);
- failed = 1;
- rv = -1;
- break;
- }
- }
- if(n < 0) {
- fprint(2, "cp: error reading %s: %r\n", from);
- failed = 1;
- rv = -1;
- }
- free(buf);
- return rv;
- }
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