/*  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_anal.c: Run-command processor ISO C source file
*/

#include <stdlib.h>
#include <string.h>

#include "rc.h"         /* Public interfaces        */
#include "rc_const.h"   /* String constants         */
#include "rc_config.h"  /* Configuration interface  */
#include "rc_anal.h"    /* Anal specific headers    */


/************************************************
* analNew(void)                                 *
* Construct a new analyser                      *
************************************************/
rc_anal_t *analNew(void)
{
    rc_anal_t *pNew = NULL;

    /* Allocate storage for 1 anal object */
    pNew = calloc(1, sizeof(rc_anal_t));
    return(pNew);
}

/************************************************
* private analRcs(rc_anal_t **, const char *)   *
* Read a rc file identifier to analyse          *
************************************************/
rc_return_t analRcs(rc_anal_t **ppInst, const char *kszName)
{
    ex_t Except;

    assert(!(*ppInst)->m_pszRcs); /* Rcs should be NULL until we set them */

    if (!kszName)
        return(RC_THROW(RC_ERR_RCF));
    else { /* Only enter block with valid string, strdup can't handle NULL */
        (*ppInst)->m_pszRcs = malloc(sizeof(char **));
        if (strcmp(kszName, RC_GLOB_WILD)) {
            (*ppInst)->m_pszRcs = malloc(sizeof(*((*ppInst)->m_pszRcs)) * 2);
            (*ppInst)->m_pszRcs[0] = strdup(kszName);
            (*ppInst)->m_pszRcs[0] = strdup(kszName);
            (*ppInst)->m_pszRcs[1] = NULL;
            (*ppInst)->m_nRcs = 1;            /* We handle just one rc file */
        }
        else { /* Wildcard rcfile indicates we must glob the locs directories */
            try {
                analGloblocs(ppInst);
            }
            catch(Except)
                rethrow;
        }
    }

    return(RC_THROW(RC_OK));
}

/************************************************
* private analTmp(rc_anal_t **, const char *)   *
* Read a temp file to analyze                   *
************************************************/
rc_return_t analTmp(rc_anal_t **ppInst, const char *kszName)
{
    if (!kszName) {
        (*ppInst)->m_szTmp = NULL;
/*        RC_THROW(RC_WRN_NUL);*/
    }
    else { /* Only enter block with valid string, strdup can't handle NULL */
        (*ppInst)->m_szTmp = strdup(kszName);
    }

    return(RC_THROW(RC_OK));
}

/************************************************
* private analFuncs(rc_anal_t **, const char *) *
* Read a functions file to analyse              *
************************************************/
rc_return_t analFuncs(rc_anal_t **ppInst, const char *kszName)
{
    if (!kszName) {
        (*ppInst)->m_szFuncs = NULL;
/*        RC_THROW(RC_WRN_NUL);*/
    }
    else { /* Only enter block with valid string, strdup can't handle NULL */
        (*ppInst)->m_szFuncs = strdup(kszName);
    }

    return(RC_THROW(RC_OK));
}

/************************************************
* private analLocs(rc_anal_t **, const char *)  *
* Read a location path expression to analyse    *
************************************************/
rc_return_t analLocs(rc_anal_t **ppInst, const char *kszPathexpr)
{
    if (!kszPathexpr) {
        (*ppInst)->m_szLocs = NULL;
        (*ppInst)->m_szLocs = strdup("./"); /* FIXME: Relocate default val */
/*        RC_THROW(RC_WRN_NUL);*/ /* FIXME: ex_ Illegal instruction - core dumped */
    }
    else { /* Only enter block with valid string, strdup can't handle NULL */
        if (*(kszPathexpr + strlen(kszPathexpr)) != '/') {
            (*ppInst)->m_szLocs = malloc(strlen(kszPathexpr) + 2 * sizeof(char));
            strcpy((*ppInst)->m_szLocs, kszPathexpr);
            if ((char)*((*ppInst)->m_szLocs + strlen((*ppInst)->m_szLocs) - 1) != '/')
                strcat((*ppInst)->m_szLocs, "/");
        }
        else
            (*ppInst)->m_szLocs = strdup(kszPathexpr);
    }

    return(RC_THROW(RC_OK));
}

/************************************************
* private analSecs(rc_anal_t **, const char **) *
* Read a sections vector to analyse             *
************************************************/
rc_return_t analSecs(rc_anal_t **ppInst, const char **pkszVector)
{
    ex_t Except;

    if (!pkszVector) {
        RC_THROW(RC_WRN_NUL);
    }

    ex_try {    /* Sections are a vector, so we must copy accordingly */
        (*ppInst)->m_pszSecs = vectorCopy(pkszVector);
        (*ppInst)->m_nSecs   = vectorCount(pkszVector);
    }
    ex_catch(Except)
        rethrow;

    return(RC_THROW(RC_OK));
}

/***************************************************************
* int analFileselect(struct dirent *Direntry)                  *
* Calculate whether a directory entry belongs to a defined set *
***************************************************************/
int analFileselect(struct dirent *Direntry)
{
    if ((Direntry->d_name != NULL) && (strncmp(Direntry->d_name, "rc.", 3) == 0))
        return (TRUE);
    else if ((strcmp(Direntry->d_name, ".") == 0) || (strcmp(Direntry->d_name, "..") == 0))
        return (FALSE);
    else /* Catchall returns false for all not met set conditions */
        return (FALSE);
}

/************************************************
* analGloblocs(rc_anal_t **ppInst)              *
* Glob all files of the location directories    *
************************************************/
rc_return_t analGloblocs(rc_anal_t **ppInst)
{
    DIR *pLocdir = NULL;
    struct dirent *pDirent = NULL;
    int nCount = 0; /* How many globbed files we find */
    int nIter = 0;  /* Used to step through found files */

    assert(*ppInst); /* Sanity check */

    /* First just learn how many globbed files we have */
    if ((pLocdir = opendir((*ppInst)->m_szLocs)) == NULL)
        return(RC_THROW(RC_ERR_DIR));
    for (pDirent = readdir(pLocdir); pDirent; pDirent = readdir(pLocdir))
        if (!strncmp(pDirent->d_name, "rc.", 3))
            nCount++;
    closedir(pLocdir);

    if (nCount == 0) /* Check out the health of this directory listing */
        return(RC_THROW(RC_ERR_DIR));
    else /* Allocate for the string array to hold directory entry names */
        (*ppInst)->m_pszRcs = malloc(sizeof(*((*ppInst)->m_pszRcs)) * (nCount + 1));

    /* Loop through file index setting rc file names according to dirent */
    if ((pLocdir = opendir((*ppInst)->m_szLocs)) == NULL)
        return(RC_THROW(RC_ERR_DIR));
    for (pDirent = readdir(pLocdir); pDirent; pDirent = readdir(pLocdir)) {
        if (!strncmp(pDirent->d_name, "rc.", 3)) {
            (*ppInst)->m_pszRcs[nIter] = strdup(pDirent->d_name + \
                                         strlen("rc.") * sizeof(char));
            nIter++;
        }
    }
    closedir(pLocdir);

    (*ppInst)->m_pszRcs[nIter] = NULL; /* Terminate */
    (*ppInst)->m_nRcs = nCount; /* Store how many globbed files there are */

    return(RC_THROW(RC_OK));
}

/************************************************
* analParse(rc_anal_t *)                        *
* Parse the analyzed configuration data         *
************************************************/
rc_return_t analParse(rc_anal_t *pInst)
{
    ex_t Except;

    assert(pInst); /* Verify sanity */
    ex_try { /* Read in data from the main configuration */
        analLocs (&pInst, configGetval(RC_LOC_VAL));
        analRcs  (&pInst, configGetrcfile());
        analTmp  (&pInst, configGetval(RC_TMP_VAL));
        analFuncs(&pInst, configGetval(RC_FNC_VAL));
        analSecs (&pInst, configGetsecs());
    }
    ex_catch(Except)
        rethrow;

    return(RC_THROW(RC_OK));
}

/************************************************
* analDelete(rc_anal_t *)                       *
* Destruct an analyser                          *
************************************************/
rc_return_t analDelete(rc_anal_t *pInst)
{
/* FIXME: It could be that pInst needs to be a double pointer to */
/*        be properly used in destruction. Otherwise members are */
/*        just copies of the stack parameters passed in.         */
    int nIter = 0;

    assert(pInst); /* Verify sanity */

    if (pInst->m_pszRcs && pInst->m_pszRcs[nIter])
        while (pInst->m_pszRcs[nIter]) /* Rc file names    */
            free(pInst->m_pszRcs[nIter++]);
    if (pInst->m_pszRcs)            /* Rc file name index  */
        free(pInst->m_pszRcs);
    if (pInst->m_szTmp)             /* Temp file name      */
        free(pInst->m_szTmp);
    if (pInst->m_szFuncs)           /* Function file names */
        free(pInst->m_szFuncs);
    if (pInst->m_szLocs)            /* Location path names */
        free(pInst->m_szLocs);
    if (pInst->m_pszSecs)           /* Section names       */
        vectorDel(pInst->m_pszSecs);

    free(pInst);

    return(RC_THROW(RC_OK));
}