/*  OSSP rc - Run-command processor
**  Copyright (c) 2002 Ralf S. Engelschall
**  Copyright (c) 2002 Cable & Wireless Deutschland GmbH
**  Copyright (c) 2002 The OSSP Project <http://www.ossp.org/>
**
**  This file is part of OSSP rc, a portable Run-command processor
**  which can be found at http://www.ossp.org/pkg/lib/rc/
**
**  Permission to use, copy, modify, and distribute this software for
**  any purpose with or without fee is hereby granted, provided that
**  the above copyright notice and this permission notice appear in all
**  copies.
**
**  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
**  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
**  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
**  IN NO EVENT SHALL THE AUTHORS AND COPYRIGHT HOLDERS AND THEIR
**  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
**  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
**  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
**  USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
**  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
**  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
**  OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
**  SUCH DAMAGE.
**
**  rc_proc.c: Run-command processor ISO C source file
*/

#include <stdlib.h>     /* Standard system headers  */
#include <fcntl.h>      /* For reading rc files     */
#include <unistd.h>     /* For reading rc files     */
#include <string.h>     /* For string manipulation  */

/* FIXME: Remove */
#include <sys/stat.h>

#include "rc.h"         /* Public interfaces        */
#include "rc_config.h"  /* Option definitions       */


/************************************************
* procNew(void)                                 *
* Construct a processor                         *
************************************************/
rc_proc_t *procNew(void)
{
    rc_proc_t *pNewrc = NULL;

    pNewrc = malloc(sizeof(rc_proc_t));
    pNewrc->m_pAnal = analNew();        /* Construct a configuration analyser */
    pNewrc->m_pScript = scriptNew();    /* Construct a run-command script     */
    analParse(pNewrc->m_pAnal);         /* Preprocess the anal configuration  */

    return(pNewrc);
}

/************************************************
* procReadtmp(rc_proc_t *, const char *)        *
* Open and store a temp file                    *
************************************************/
rc_return_t procReadtmp(rc_proc_t *pRc, const char *szTmpname)
{
    fprintf(stderr, "%s!!!\n", szTmpname);

    return(RC_THROW(RC_OK));
}

/************************************************
* procPopulate(rc_proc_t *)                     *
* Populate the processor with run commands      *
************************************************/
rc_return_t procPopulate(rc_proc_t *pRc)
{
    int i         = 0;
    int nFdrc     = 0;
    int nFdfunc   = 0;
    int nRet      = 0;
    int nIter     = 0;
    ex_t Except;

    char *sBuf    = NULL;
    char *szSec   = NULL;
    char *szLocex = NULL;
    rc_script_t *pTempscript = NULL;

    assert(*pRc->m_pAnal->m_szRcs);
    sBuf = (char *)calloc(1, RC_READ_BUFSIZE);

    /* Open the func file if it exists in the configuration */
    if (pRc->m_pAnal->m_szFuncs) {
        if ((nFdfunc = open(pRc->m_pAnal->m_szFuncs, O_RDONLY)) == -1) {
            RC_THROW(RC_ERR_FNC);
        }
    }

    /* Read the func file if it was opened successfully */
    /* We unfortunately make the assumption that 0 is an invalid filedesc */
    if (nFdfunc) {
        /* Read data from the func file */
        while ((nRet = read(nFdfunc, sBuf, RC_READ_BUFSIZE)) > 0) {
            scriptAppend(pRc->m_pScript, sBuf, nRet);
        }
        if (nRet == -1) /* Handle read errors */
            RC_THROW(RC_ERR_IO);
    }

    /* Iteratively read possibly globbed rc files */
    for (nIter = 0; pRc->m_pAnal->m_szRcs[nIter]; nIter++)
    {
        assert(*pRc->m_pAnal->m_szRcs); /* If one of these assertions fail, */
        assert(pRc->m_pAnal->m_szLocs); /* you've probably seen the ex_ bug */

        /* Build the path name */
        szLocex = (char *)malloc(strlen(pRc->m_pAnal->m_szLocs) + strlen(pRc->m_pAnal->m_szRcs[nIter]) + 2);
        strcpy(szLocex, pRc->m_pAnal->m_szLocs);
        strcat(szLocex, pRc->m_pAnal->m_szRcs[nIter]);

        /* Open the rc file unconditionally */
        if ((nFdrc = open(szLocex, O_RDONLY)) == -1)
            RC_THROW(RC_ERR_RCF);

        /* Read data from the rc file into a temporary script */
        pTempscript = scriptNew();
        while ((nRet = read(nFdrc, sBuf, RC_READ_BUFSIZE)) > 0)
            scriptAppend(pTempscript, sBuf, nRet);

        if (nRet == -1) /* Handle read errors */
            RC_THROW(RC_ERR_IO);

        try {
            for (i = 0; pRc->m_pAnal->m_pszSecs[i]; i++) { /* Iterate over */
                /* Extract a section from the temp script, and append it */
                szSec = scriptSection(pTempscript, pRc->m_pAnal->m_pszSecs[i]);

                if (szSec) /* Only call append if the section lookup succeeds */
                    scriptAppend(pRc->m_pScript, szSec, strlen(szSec));
                else if (configGetval(RC_DBG_VAL)) /* Only show if debug set */
                    fprintf(stderr, "#Warning: Missing section '%s' in %s!\n",\
                        pRc->m_pAnal->m_pszSecs[i],\
                        pRc->m_pAnal->m_szRcs[nIter]);

                if (szSec) { /* Cleanup section string */
                    free(szSec);
                    szSec = NULL;
                }
            }
        }
        catch(Except)
            rethrow;

        /* Clean up our crap */
        scriptDelete(pTempscript); /* Temp script */
        pTempscript = NULL;
        free(szLocex);  /* Temp Location + Rcfile */
        szLocex = NULL;
        close(nFdrc);   /* Close Rc file handle */
    }

    close(nFdfunc);     /* Close Func file handle */

    /* Memory cleanups */
    if (sBuf) {
        free(sBuf);
        sBuf = NULL;
    }

    return(RC_THROW(RC_OK));
}

/************************************************
* procRun(rc_proc_t *)                          *
* Run the processed run-command script          *
************************************************/
rc_return_t procRun(rc_proc_t *pRc)
{
    /* This will evaluate, execute, or print the script to stdout */
    if (configGetval(RC_EVL_VAL))       /* Evaluate */
        fprintf(stderr, "Error: Evaluate is not implemented yet.\n"); /* FIX */
    else if (configGetval(RC_EXC_VAL))  /* Execute  */
        fprintf(stderr, "Error: Execute is not implemented yet.\n");  /* FIX */
    else if (configGetval(RC_PRN_VAL))  /* Print    */
        scriptDump(pRc->m_pScript);
    else                                /* Something is wrong here, there is */
        fprintf(stderr, "Error: Placeholder, until problem with ex_ is fixed.\n");
/* FIXME!!: Ralf, following segfaults in ex */
/*        return(RC_THROW(RC_ERR_INT));*/   /* probably no default in the config */

    return(RC_THROW(RC_OK));
}

/************************************************
* procDelete(rc_proc_t *)                       *
* Destruct a processor                          *
************************************************/
rc_return_t procDelete(rc_proc_t *pRc)
{
    scriptDelete(pRc->m_pScript);   /* Destroy the script        */
    analDelete(pRc->m_pAnal);       /* Destroy the analyser      */
    free(pRc);                      /* Free the processor itself */

    return(RC_THROW(RC_OK));
}