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Annotation of researchv10no/cmd/nupas/ipc/ipcpath.c, revision 1.1

1.1     ! root        1: #include <stdio.h>
        !             2: #include <string.h>
        !             3: 
        !             4: extern int ipcdebug;
        !             5: 
        !             6: #define CAT(x) if (x) for(cp=x;bp-buf<sizeof(buf)-1&&*cp;) *bp++ = *cp++; *bp='\0'
        !             7: 
        !             8: /*
        !             9:  *     Create an ipc path that starts in the /cs directory
        !            10:  *
        !            11:  *     ipcpath("x!y!z", "d", "s") -> "x!y!z"
        !            12:  *     ipcpath("x!y", "d", "s") -> "x!y!s"
        !            13:  *     ipcpath("x", "d", "s") -> "d!x!s"
        !            14:  *
        !            15:  *     all other combinations abort with an error
        !            16:  */
        !            17: char *
        !            18: ipcpath(machine, defdialer, service)
        !            19:        char *machine;
        !            20:        char *defdialer;
        !            21:        char *service;
        !            22: {
        !            23:        char *field[3];
        !            24:        static char buf[256];
        !            25:        char ibuf[sizeof buf];
        !            26:        char *bp = buf;
        !            27: 
        !            28:        *bp = '\0';
        !            29: 
        !            30:        if (machine == NULL)
        !            31:                machine = "";
        !            32:        strcpy(ibuf, machine);
        !            33:        if (ipcdebug)
        !            34:                printf("ipcpath called with %s, %s, %s\n",
        !            35:                        ibuf, defdialer, service);
        !            36: 
        !            37:        setfields("!");
        !            38: 
        !            39:        switch (getfields(ibuf, field, 3)) {
        !            40:        case 3: bp = strcat(bp, field[0]);
        !            41:                bp = strcat(bp, "!");
        !            42:                bp = strcat(bp, field[1]);
        !            43:                bp = strcat(bp, "!");
        !            44:                bp = strcat(bp, field[2]);
        !            45:                break;
        !            46: 
        !            47:        case 2: bp = strcat(bp, field[0]);
        !            48:                bp = strcat(bp, "!");
        !            49:                bp = strcat(bp, field[1]);
        !            50:                bp = strcat(bp, "!");
        !            51:                if (service!=NULL && *service!='\0')
        !            52:                        bp = strcat(bp, service);
        !            53:                break;
        !            54: 
        !            55:        case 1: bp = strcat(bp, defdialer);
        !            56:                bp = strcat(bp, "!");
        !            57:                bp = strcat(bp, field[0]);
        !            58:                bp = strcat(bp, "!");
        !            59:                if (service!=NULL && *service!='\0')
        !            60:                        bp = strcat(bp, service);
        !            61:                break;
        !            62: 
        !            63:        default:
        !            64:                fprintf(stderr, "Illegal machine: %s\n", machine);
        !            65:                exit(1);
        !            66:        }
        !            67:        if(ipcdebug)
        !            68:                printf("ipcpath returning %s\n", buf);
        !            69:        return buf;
        !            70: }

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