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Annotation of researchv10no/cmd/ps/getargs.c, revision 1.1.1.1

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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