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Annotation of researchv10no/cmd/ps/getargs.c, revision 1.1

1.1     ! root        1: #include "ps.h"
        !             2: #include <sys/vmmac.h>
        !             3: 
        !             4: #define NCMD   63
        !             5: 
        !             6: static char stack[NSTACK];
        !             7: 
        !             8: char *
        !             9: getargs(f, pp, up)
        !            10: int f; register struct proc *pp; register struct user *up;
        !            11: {
        !            12:        register char *sp; char *argp, *argend, *envend;
        !            13:        int nstack;
        !            14: 
        !            15:        if (pp->p_stat == SZOMB)
        !            16:                goto ucommand;
        !            17:        if((nstack = getstack(f, pp, up, stack)) == 0)
        !            18:                goto ucommand;
        !            19:        sp = stack+nstack;
        !            20:        while (*--sp == 0)
        !            21:                if (sp <= stack)
        !            22:                        goto ucommand;
        !            23:        envend = sp + 2;
        !            24: 
        !            25:        sp = (char *)((long)sp & (~3));
        !            26:        while (*(long *)(sp -= 4) != 0)
        !            27:                if (sp <= stack)
        !            28:                        goto ucommand;
        !            29:        argp = sp + 4;
        !            30: 
        !            31:        while (*(long *)(sp -= 4) != 0)
        !            32:                if (sp <= stack)
        !            33:                        goto ucommand;
        !            34:        argend = *(long *)(sp + 4) - (UBASE - nstack) + stack;  /* envp[0] */
        !            35: 
        !            36:        if (argend <= argp || argend > envend )
        !            37:                argend = envend;
        !            38:        if (argend > (sp = argp + NCMD))
        !            39:                argend = sp;
        !            40:        for (sp = argp; sp < argend; sp++) {
        !            41:                if (*sp == 0 || *sp == '\t')
        !            42:                        *sp = ' ';
        !            43:                else if (*sp < ' ' || *sp >= 0177)
        !            44:                        *sp = '?';
        !            45:        }
        !            46:        while (sp[-1] == ' ')
        !            47:                sp--;
        !            48:        *sp = 0;
        !            49:        return argp;
        !            50: 
        !            51: ucommand:
        !            52:        sprintf(stack, "(%-.*s)", DIRSIZ, up->u_comm);
        !            53:        return stack;
        !            54: }

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