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Annotation of xinu/sys/shell/x_cp.c, revision 1.1.1.1

1.1       root        1: /* x_cp.c - x_cp */
                      2: 
                      3: #include <conf.h>
                      4: #include <kernel.h>
                      5: #include <shell.h>
                      6: 
                      7: LOCAL  char    errfmt[] = "Cannot open %s\n";
                      8: 
                      9: /*------------------------------------------------------------------------
                     10:  *  x_cp  -  (copy command) copy one file to another
                     11:  *------------------------------------------------------------------------
                     12:  */
                     13: COMMAND        x_cp(stdin, stdout, stderr, nargs, args)
                     14: int    stdin, stdout, stderr, nargs;
                     15: char   *args[];
                     16: {
                     17:        char    *buf;
                     18:        int     from, to;
                     19:        int     ret;
                     20:        int     len;
                     21: 
                     22:        if (nargs != 3) {
                     23:                fprintf(stderr, "usage: cp file1 file2\n");
                     24:                return(SYSERR);
                     25:        }
                     26:        if ( (from=open(NAMESPACE, args[1], "ro")) == SYSERR) {
                     27:                fprintf(stderr, errfmt, args[1]);
                     28:                return(SYSERR);
                     29:        }
                     30:        if ( (to=open(NAMESPACE, args[2], "w")) == SYSERR) {
                     31:                close(from);
                     32:                fprintf(stderr, errfmt, args[2]);
                     33:                return(SYSERR);
                     34:        }
                     35:        if ( ((int) (buf = (char *)getmem(512)) ) == SYSERR) {
                     36:                fprintf(stderr, "no memory\n");
                     37:                ret = SYSERR;
                     38:        } else {
                     39:                while ( (len = read(from, buf, 512)) > 0 )
                     40:                        write(to, buf, len);
                     41:                freemem(buf, 512);
                     42:                ret = OK;
                     43:        }
                     44:        close(from);
                     45:        close(to);
                     46:        return(ret);
                     47: }

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