cliargs.c

来自「unix环境高级编程的源代码」· C语言 代码 · 共 52 行

#include    "calld.h"

/* This function is called by buf_args(), which is called by loop().
 * buf_args() has broken up the client's buffer into an argv[] style
 * array, which is now processed. */

int
cli_args(int argc, char **argv)
{
    int        c;

    if (argc < 2 || strcmp(argv[0], CL_CALL) != 0) {
        strcpy(errmsg, "usage: call <sysname> <options>");
        return(-1);
    }
    Debug = 0;        /* option defaults */
    parity = NONE;
    speed = NULL;
    opterr = 0;        /* don't want getopt() writing to stderr */
    optind = 1;        /* since we call getopt() multiple times */
    while ( (c = getopt(argc, argv, "des:o")) != EOF) {
        switch (c) {
        case 'd':
            Debug = 1;    /* client wants DEBUG() output */
            break;

        case 'e':        /* even parity */
            parity = EVEN;
            break;

        case 'o':        /* odd parity */
            parity = ODD;
            break;

        case 's':        /* speed */
            speed = optarg;
            break;

        case '?':
            sprintf(errmsg, "unrecognized option: -%c\n", optopt);
            return(-1);
        }
    }
    if (optind < argc)
        sysname = argv[optind];        /* name of host to call */
    else {
        sprintf(errmsg, "missing <hostname> to call\n");
        return(-1);
    }
    return(0);
}