187 lines
3.3 KiB
C
187 lines
3.3 KiB
C
/*
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* This file is part of the UCB release of Plan 9. It is subject to the license
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* terms in the LICENSE file found in the top-level directory of this
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* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
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* part of the UCB release of Plan 9, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms contained
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* in the LICENSE file.
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*/
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#include <u.h>
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#include <lib9.h>
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#define DEFB (8*1024)
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int failed;
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int gflag;
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int uflag;
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int xflag;
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void copy(char *from, char *to, int todir);
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int copy1(int fdf, int fdt, char *from, char *to);
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void
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main(int argc, char *argv[])
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{
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Dir *dirb;
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int todir, i;
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ARGBEGIN {
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case 'g':
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gflag++;
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break;
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case 'u':
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uflag++;
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gflag++;
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break;
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case 'x':
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xflag++;
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break;
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default:
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goto usage;
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} ARGEND
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todir=0;
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if(argc < 2)
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goto usage;
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dirb = dirstat(argv[argc-1]);
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if(dirb!=nil && (dirb->mode&DMDIR))
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todir=1;
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if(argc>2 && !todir){
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fprint(2, "cp: %s not a directory\n", argv[argc-1]);
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exits("bad usage");
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}
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for(i=0; i<argc-1; i++)
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copy(argv[i], argv[argc-1], todir);
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if(failed)
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exits("errors");
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exits(0);
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usage:
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fprint(2, "usage:\tcp [-gux] fromfile tofile\n");
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fprint(2, "\tcp [-x] fromfile ... todir\n");
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exits("usage");
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}
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int
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samefile(Dir *a, char *an, char *bn)
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{
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Dir *b;
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int ret;
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ret = 0;
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b=dirstat(bn);
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if(b != nil)
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if(b->qid.type==a->qid.type)
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if(b->qid.path==a->qid.path)
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if(b->qid.vers==a->qid.vers)
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if(b->dev==a->dev)
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if(b->type==a->type){
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fprint(2, "cp: %s and %s are the same file\n", an, bn);
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ret = 1;
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}
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free(b);
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return ret;
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}
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void
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copy(char *from, char *to, int todir)
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{
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Dir *dirb, dirt;
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char name[256];
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int fdf, fdt, mode;
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if(todir){
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char *s, *elem;
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elem=s=from;
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while(*s++)
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if(s[-1]=='/')
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elem=s;
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sprint(name, "%s/%s", to, elem);
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to=name;
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}
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if((dirb=dirstat(from))==nil){
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fprint(2,"cp: can't stat %s: %r\n", from);
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failed = 1;
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return;
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}
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mode = dirb->mode;
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if(mode&DMDIR){
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fprint(2, "cp: %s is a directory\n", from);
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free(dirb);
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failed = 1;
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return;
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}
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if(samefile(dirb, from, to)){
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free(dirb);
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failed = 1;
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return;
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}
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mode &= 0777;
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fdf=open(from, OREAD);
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if(fdf<0){
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fprint(2, "cp: can't open %s: %r\n", from);
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free(dirb);
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failed = 1;
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return;
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}
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fdt=ocreate(to, OWRITE, mode);
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if(fdt<0){
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fprint(2, "cp: can't create %s: %r\n", to);
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close(fdf);
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free(dirb);
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failed = 1;
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return;
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}
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if(copy1(fdf, fdt, from, to)==0 && (xflag || gflag || uflag)){
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nulldir(&dirt);
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if(xflag){
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dirt.mtime = dirb->mtime;
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dirt.mode = dirb->mode;
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}
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if(uflag)
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dirt.uid = dirb->uid;
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if(gflag)
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dirt.gid = dirb->gid;
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if(dirfwstat(fdt, &dirt) < 0)
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fprint(2, "cp: warning: can't wstat %s: %r\n", to);
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}
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free(dirb);
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close(fdf);
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close(fdt);
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}
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int
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copy1(int fdf, int fdt, char *from, char *to)
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{
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char *buf;
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int32_t n, n1, rcount;
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int rv;
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char err[ERRMAX];
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buf = malloc(DEFB);
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/* clear any residual error */
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err[0] = '\0';
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errstr(err, ERRMAX);
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rv = 0;
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for(rcount=0;; rcount++) {
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n = read(fdf, buf, DEFB);
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if(n <= 0)
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break;
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n1 = write(fdt, buf, n);
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if(n1 != n) {
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fprint(2, "cp: error writing %s: %r\n", to);
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failed = 1;
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rv = -1;
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break;
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}
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}
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if(n < 0) {
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fprint(2, "cp: error reading %s: %r\n", from);
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failed = 1;
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rv = -1;
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}
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free(buf);
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return rv;
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}
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