dialfile.c

unix环境高级编程的源代码

#include    "calld.h"

static FILE    *fpdial = NULL;
static int    diallineno;            /* for error messages */
static char    dialline[MAXLINE];
        /* can't be automatic; dial_next() returns pointers into here */

/* Read and break apart a line in the Dialers file. */

int
dial_next(Dialers *dialptr)    /* pointers in structure are filled in */
{
    if (fpdial == NULL) {
        if ( (fpdial = fopen(DIALERS, "r")) == NULL)
            log_sys("can't open %s", DIALERS);
        diallineno = 0;
    }

again:
    if (fgets(dialline, MAXLINE, fpdial) == NULL)
        return(-1);        /* EOF */
    diallineno++;

    if ( (dialptr->dialer = strtok(dialline, WHITE)) == NULL) {
        if (dialline[0] == '\n')
            goto again;        /* ignore empty line */
        log_quit("missing `dialer' in Dialers file, line %d", diallineno);
    }
    if (dialptr->dialer[0] == '#')
        goto again;            /* ignore comment line */

    if ( (dialptr->sub = strtok(NULL, WHITE)) == NULL)
        log_quit("missing `sub' in Dialers file, line %d", diallineno);

    if ( (dialptr->expsend = strtok(NULL, "\n")) == NULL)
        log_quit("missing `expsend' in Dialers file, line %d", diallineno);

    return(0);
}

void
dial_rew(void)
{
    if (fpdial != NULL)
        rewind(fpdial);
    diallineno = 0;
}

/* Find a dialer match */

int
dial_find(Dialers *dialptr, const Devices *devptr)
{
    dial_rew();
    while (dial_next(dialptr) >= 0) {
        if (strcmp(dialptr->dialer, devptr->dialer) == 0)
            return(0);        /* found a dialer match */
    }
    sprintf(errmsg, "dialer `%s' not found\n", dialptr->dialer);
    return(-1);
}