Subversion Repositories planix.SVN

#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;
}