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Annotation of researchv9/cmd/ps/getargs.c, revision 1.1.1.1

1.1       root        1: #include "ps.h"
                      2: #include <sys/vmmac.h>
                      3: 
                      4: #define NSTACK 8192
                      5: #define NCMD   63
                      6: #define CMDSIZ (4*((DIRSIZ + 3 + 3)/4))
                      7: 
                      8: char stack[NSTACK], cmdline[CMDSIZ];
                      9: 
                     10: char *
                     11: getargs(f, pp, up)
                     12: int f; register struct proc *pp; register struct user *up;
                     13: {
                     14:        register char *sp; char *argp, *argend, *envend;
                     15:        int nstack, staddr, stblk;
                     16: 
                     17:        nstack = ctob(up->u_ssize);
                     18:        if (nstack > NSTACK)
                     19:                nstack = NSTACK;
                     20:        staddr = STTOP - nstack;
                     21: 
                     22:        if (pp->p_flag & SLOAD) {
                     23:                if (!Seek(f, staddr) || !Read(f, stack, nstack))
                     24:                        goto ucommand;
                     25:        } else {
                     26:                stblk = up->u_smap.dm_map[dndmap()] + DMMIN;
                     27:                if (!Seek(drum, stblk*NBPG/ctod(1) - nstack) ||
                     28:                    !Read(drum, stack, nstack))
                     29:                        goto ucommand;
                     30:        }
                     31: 
                     32:        sp = stack + nstack;
                     33:        while (*--sp == 0)
                     34:                if (sp <= stack) goto ucommand;
                     35:        envend = sp + 2;
                     36: 
                     37:        sp = (char *)((long)sp & (~3));
                     38:        while (*(long *)(sp -= 4) != 0)
                     39:                if (sp <= stack) goto ucommand;
                     40:        argp = sp + 4;
                     41: 
                     42:        while (*(long *)(sp -= 4) != 0)
                     43:                if (sp <= stack) goto ucommand;
                     44:        argend = *(long *)(sp + 4) - staddr + stack;    /* envp[0] */
                     45: 
                     46:        if (argend <= argp || argend > envend )
                     47:                argend = envend;
                     48:        if (argend > (sp = argp + NCMD))
                     49:                argend = sp;
                     50:        for (sp = argp; sp < argend; sp++) {
                     51:                if (*sp == 0 || *sp == '\t')
                     52:                        *sp = ' ';
                     53:                else if (*sp < ' ' || *sp >= 0177)
                     54:                        *sp = '?';
                     55:        }
                     56:        while (sp[-1] == ' ')
                     57:                sp--;
                     58:        *sp = 0;
                     59:        return argp;
                     60: 
                     61: ucommand:
                     62:        sprintf(cmdline, "(%-.*s)", DIRSIZ, up->u_comm);
                     63:        return cmdline;
                     64: }
                     65: 
                     66: dndmap()
                     67: {
                     68:        register f, n; char cbuf[16];
                     69:        static called, delta;
                     70:        if (called++)
                     71:                return delta;
                     72:        if ((f = open("/etc/ndmap", 0)) < 0)
                     73:                return 0;
                     74:        n = read(f, cbuf, sizeof cbuf-1);
                     75:        close(f);
                     76:        if (n <= 0)
                     77:                return 0;
                     78:        cbuf[n] = 0;
                     79:        return (delta = atoi(cbuf) - NDMAP);
                     80: }

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