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

1.1       root        1: /* addarg.c - addarg */
                      2: 
                      3: #include <conf.h>
                      4: #include <kernel.h>
                      5: #include <proc.h>
                      6: #include <shell.h>
                      7: 
                      8: /*------------------------------------------------------------------------
                      9:  *  addarg  -  copy arguments to area reserved on process stack
                     10:  *------------------------------------------------------------------------
                     11:  */
                     12: addarg(pid, nargs, len)
                     13: int    pid;                            /* process to receive arguments */
                     14: int    nargs;                          /* number of arguments to copy  */
                     15: int    len;                            /* size of arg. area (in bytes) */
                     16: {
                     17:        struct  pentry  *pptr;
                     18:        char    **fromarg;
                     19:        int     *toarg;
                     20:        char    *to;
                     21: 
                     22:        if (isbadpid(pid) || (pptr= &proctab[pid])->pstate != PRSUSP)
                     23:                return(SYSERR);
                     24:        toarg = (int *) ( ((unsigned)pptr->pbase) - (unsigned)len );
                     25:        to = (char *) (toarg + (nargs + 2));
                     26:        *toarg++ = (int)(toarg + 1);
                     27:        for (fromarg= Shl.shtok ; nargs > 0 ; nargs--) {
                     28:                *toarg++ = (int)to;
                     29:                strcpy(to, *fromarg++);
                     30:                to += strlen(to) + 1;           
                     31:        }
                     32:        *toarg = 0;
                     33:        return(OK);
                     34: }

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