source: trunk/third/nmh/sbr/getans.c @ 12455

/*
 * getans.c -- get an answer from the user and return a string array
 *
 * $Id: getans.c,v 1.1.1.1 1999-02-07 18:14:08 danw Exp $
 */

#include <h/mh.h>
#include <h/signals.h>
#include <setjmp.h>
#include <signal.h>

static char ansbuf[BUFSIZ];
static jmp_buf sigenv;

/*
 * static prototypes
 */
static RETSIGTYPE intrser (int);


char **
getans (char *prompt, struct swit *ansp)
{
    int i;
    SIGNAL_HANDLER istat;
    char *cp, **cpp;

    if (!(setjmp (sigenv))) {
        istat = SIGNAL (SIGINT, intrser);
    } else {
        SIGNAL (SIGINT, istat);
        return NULL;
    }

    for (;;) {
        printf ("%s", prompt);
        fflush (stdout);
        cp = ansbuf;
        while ((i = getchar ()) != '\n') {
            if (i == EOF)
                longjmp (sigenv, 1);
            if (cp < &ansbuf[sizeof ansbuf - 1])
                *cp++ = i;
        }
        *cp = '\0';
        if (ansbuf[0] == '?' || cp == ansbuf) {
            printf ("Options are:\n");
            print_sw (ALL, ansp, "");
            continue;
        }
        cpp = brkstring (ansbuf, " ", NULL);
        switch (smatch (*cpp, ansp)) {
            case AMBIGSW: 
                ambigsw (*cpp, ansp);
                continue;
            case UNKWNSW: 
                printf (" -%s unknown. Hit <CR> for help.\n", *cpp);
                continue;
            default: 
                SIGNAL (SIGINT, istat);
                return cpp;
        }
    }
}


static RETSIGTYPE
intrser (int i)
{
    /*
     * should this be siglongjmp?
     */
    longjmp (sigenv, 1);
}