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/*
** Copyright 1998 - 2001 Double Precision, Inc.
** See COPYING for distribution information.
*/

#if    HAVE_CONFIG_H
#include    "config.h"
#endif
#include    <stdio.h>
#if    HAVE_UNISTD_H
#include    <unistd.h>
#endif
#if    HAVE_FCNTL_H
#include    <fcntl.h>
#endif
#include    <ctype.h>
#include    <string.h>
#include    <stdlib.h>
#include    <sys/types.h>
#include    <sys/uio.h>
#include    <sys/time.h>
#include    <signal.h>
#include    <errno.h>

#include    "esmtpiov.h"

time_t iovread_timeout=300;
time_t iovwrite_timeout=60;
static char inputbuf[5120];
static char *inputbufhead=inputbuf, *inputbuftail=inputbuf;
static int overflowed=0;
static struct iovec iov[10];
static int    niovec=0;

void iovreset()
{
    inputbufhead=inputbuftail=inputbuf;
}

void iovflush()
{
struct iovec *iovp=iov;
unsigned niovp=niovec;
int    n;
fd_set    fds;
struct    timeval    tv;

    while (niovp && niovec)
    {
        FD_ZERO(&fds);
        FD_SET(1, &fds);
        tv.tv_sec=iovwrite_timeout;
        tv.tv_usec=0;
        if (select(2, 0, &fds, 0, &tv) <= 0 ||
            !FD_ISSET(1, &fds) ||
            (n=writev(1, iov, niovec)) <= 0)
        {
            iov_logerror("writev: ",
#if HAVE_STRERROR
                     strerror(errno)

#else
                     "write error"
#endif
                     );
            exit(1);
        }

        while (n && niovp)
        {
            if (n >= iovp->iov_len)
            {
                n -= iovp->iov_len;
                ++iovp;
                --niovp;
                continue;
            }
            iovp->iov_base=(caddr_t)
                ( (char *)iovp->iov_base + n);
            iovp->iov_len -= n;
            break;
        }
    }
    niovec=0;
}

int iovwaitfordata(time_t *t, int abort)
{
time_t    now;

    time(&now);
    if (now < *t)
    {
    fd_set    fds;
    struct    timeval    tv;

        FD_ZERO(&fds);
        FD_SET(0, &fds);
        tv.tv_sec=*t - now;
        tv.tv_usec=0;
        if (select(1, &fds, 0, 0, &tv) > 0 &&
            FD_ISSET(0, &fds))
            return (0);
    }

    errno=ETIMEDOUT;

    {
#if HAVE_STRERROR
        const char *ip=getenv("TCPREMOTEIP");

        if (ip && *ip)
            fprintf(stderr, "[%s]: %s\n", ip,
                strerror(errno));
        else
#endif
            perror("read");
    }
    if (abort)
        exit(1);
    return (-1);
}

char *iovreadline()
{
char *p=inputbufhead;
time_t    t;

    time(&t);
    t += iovread_timeout;
    iovflush();
    for (;;)
    {
        if (p >= inputbuftail)
        {
        int    n;

            if (inputbufhead == inputbuftail)
            {
                inputbufhead=inputbuftail=inputbuf;
                iovwaitfordata(&t, 1);
                n=read(0, inputbuf, sizeof(inputbuf));
                if (n <= 0)    _exit(0);
                inputbuftail=inputbuf+n;
                p=inputbuf;
                continue;
            }
            if (inputbufhead > inputbuf)
            {
                n=0;
                while (inputbufhead < inputbuftail)
                    inputbuf[n++]= *inputbufhead++;
                inputbuftail=p=inputbuf+n;
                inputbufhead=inputbuf;
            }
            if (inputbuftail >= inputbuf+sizeof(inputbuf))
            {
                if (overflowed)    /* Already overflowed once */
                {
                    inputbuf[0]=inputbuftail[-1];
                    inputbufhead=inputbuf;
                    inputbuftail=inputbufhead+1;
                    p=inputbuftail;
                    continue;
                }
                overflowed=1;
                inputbuftail[-2]=0;
                inputbufhead=inputbuftail-1;
                return (inputbuf);
            }
            iovwaitfordata(&t, 1);
            n=read(0, inputbuftail, inputbuf+sizeof(inputbuf)-
                    inputbuftail);
            if (n <= 0)    _exit(0);
            inputbuftail += n;
        }

        if (*p == '\n' && p > inputbufhead && p[-1] == '\r')
        {
        char *q=inputbufhead;

            p[-1]=0;
            *p++=0;
            inputbufhead=p;
            if (overflowed)
            {
                overflowed=0;
                continue;
            }
            return (q);
        }
        ++p;
    }
}

void addiovec(const char *p, size_t l)
{
    iov[niovec].iov_base=(caddr_t)p;
    iov[niovec].iov_len=l;
    if (++niovec >= sizeof(iov)/sizeof(iov[0]))
        iovflush();
}
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