/**
 * @file funcDef.c
 *
 *  This module implements the DEFINE text function.
 *
 *  Time-stamp:        "2012-04-07 09:47:37 bkorb"
 *
 *  This file is part of AutoGen.
 *  AutoGen Copyright (c) 1992-2012 by Bruce Korb - all rights reserved
 *
 * AutoGen is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * AutoGen is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

typedef int (tCmpProc)(const void*, const void*);

typedef struct def_list def_list_t;
struct def_list {
    def_ent_t  de;
    char*      pzExpr;
};

/* = = = START-STATIC-FORWARD = = = */
static int
order_def_list(const void* p1, const void* p2);

static def_list_t *
link_twins(def_list_t * pDL, def_list_t * pNext, int* pCt);

static uint_t
count_named_values(templ_t * pT, macro_t * mac);

static char *
gather_assigned_value(char * pzScan, def_list_t * pDL);

static void
fill_in_values(def_list_t * pDL, char * pzScan, templ_t * pT, macro_t * mac);

static void
prep_invoke_args(macro_t * mac);

static void
build_defs(int def_ct, def_list_t * def_list);

static templ_t *
new_template(templ_t * base_tpl, macro_t * mac, char const * scan);

static void
load_define_tpl(templ_t * tpl, char const ** ppzScan);
/* = = = END-STATIC-FORWARD = = = */

static int
order_def_list(const void* p1, const void* p2)
{
    def_ent_t * pDL1 = (def_ent_t*)p1;
    def_ent_t * pDL2 = (def_ent_t*)p2;
    int cmp = streqvcmp(pDL1->de_name, pDL2->de_name);

    /*
     *  IF the names are the same, then we order them based on which name
     *  appears first.  Do not reorder entries with the same name.
     */
    if (cmp == 0)
        cmp = (int)(pDL1->de_name - pDL2->de_name);
    return cmp;
}

static def_list_t *
link_twins(def_list_t * pDL, def_list_t * pNext, int* pCt)
{
    def_list_t * pN;
    int  ct  = *pCt;
    int  idx = 1;

    pDL->de.de_twin = &(pNext->de);
    pNext->de.de_ptwin = &(pDL->de);

    for (;;) {
        pNext->de.de_index = idx++;
        pN = pNext + 1; /* We return this, valid or not */
        if (--ct <= 0)  /* count each successive twin   */
            break;
        if (streqvcmp(pNext->de.de_name, pN->de.de_name) != 0)
            break;

        /*
         *  We have found another twin.  Link it in and advance
         */
        pNext->de.de_twin  = &(pN->de);
        pN->de.de_ptwin = &(pNext->de);
        pNext = pN;
    }

    pDL->de.de_etwin  = &(pNext->de);
    pNext->de.de_twin = NULL; /* NULL terminated list */
    pDL->de.de_ptwin  = NULL; /* NULL terminated list */
    *pCt = ct;
    pDL->de.de_next   = NULL; /* in case ct == 0      */
    return pN; /* If ct is zero, then this is invalid */
}


static uint_t
count_named_values(templ_t * pT, macro_t * mac)
{
    char * pzScan = pT->td_text + mac->md_txt_off;
    uint_t ct = 0;

    while (*pzScan != NUL) {
        ct++;
        if (! IS_VAR_FIRST_CHAR(*pzScan)) {
            fprintf(stderr, NAMED_VALUES_WHERE, ct, pzScan);
            AG_ABEND_IN(pT, mac, NAMED_VALUES_NO_NAME);
        }

        pzScan = SPN_VALUE_NAME_CHARS(pzScan);
        pzScan = SPN_WHITESPACE_CHARS(pzScan);
        if (*pzScan != '=')
            continue;
        pzScan = SPN_WHITESPACE_CHARS(pzScan+1);
        pzScan = (char*)skip_expr(pzScan, strlen(pzScan));
        pzScan = SPN_WHITESPACE_CHARS(pzScan);
    }

    return ct;
}


static char *
gather_assigned_value(char * pzScan, def_list_t * pDL)
{
    pzScan = SPN_WHITESPACE_CHARS(pzScan);
    strtransform(pDL->de.de_name, pDL->de.de_name);
    pDL->pzExpr = pzScan;
    pDL->de.de_type = VALTYP_TEXT;
    pzScan = (char*)skip_expr(pzScan, strlen(pzScan));

    /*
     *  Figure out what kind of expression we have
     */
    switch (*pDL->pzExpr) {
    case ';':
    case '(':
        /*
         *  These expressions will need evaluation
         */
        break;

    case '`':
    {
        char* pz;
        /*
         *  Process the quoted string, but leave a '`' marker, too
         */
        AGDUPSTR(pz, pDL->pzExpr, "macro arg expr");
        span_quote(pz);
        strcpy(pDL->pzExpr+1, pz);
        AGFREE((void*)pz);
        break;
    }
    case '"':
    case '\'':
        /*
         *  Process the quoted strings now
         */
        if ((pzScan - pDL->pzExpr) < 24) {
            char* pz = (char*)AGALOC(24, "quoted string");
            memcpy((void*)pz, pDL->pzExpr, (size_t)(pzScan - pDL->pzExpr));
            pDL->pzExpr = pz;
        }
        span_quote(pDL->pzExpr);
        /* FALLTHROUGH */

    default:
        /*
         *  Default:  the raw sequence of characters is the value
         */
        pDL->de.de_val.dvu_text = pDL->pzExpr;
        pDL->pzExpr        = NULL;
    }

    return pzScan;
}


static void
fill_in_values(def_list_t * pDL, char * pzScan, templ_t * pT, macro_t * mac)
{
    for (;; pDL++ ) {
        pDL->de.de_name = pzScan;
        pzScan = SPN_VALUE_NAME_CHARS(pzScan);

        switch (*pzScan) {
        case NUL:
            pDL->de.de_val.dvu_text = (char*)zNil;
            return;

        default:
            AG_ABEND_IN(pT, mac, FILL_IN_VAL_NO_ASSIGN);

        case ' ': case TAB: case NL: case '\f':
            *(pzScan++) = NUL;
            pzScan = SPN_WHITESPACE_CHARS(pzScan);

            /*
             *  The name was separated by space, but has no value
             */
            if (*pzScan != '=') {
                pDL->de.de_val.dvu_text = (char*)zNil;
                if (*pzScan == NUL)
                    return;
                continue;
            }
            /* FALLTHROUGH */

        case '=':
            *(pzScan++) = NUL;
        }

        /*
         *  When we arrive here, we have just clobbered a '=' char.
         *  Now we have gather up the assigned value.
         */
        pzScan = gather_assigned_value(pzScan, pDL);

        /*
         *  IF the next char is NUL, we are done.
         *  OTHERWISE, the next character must be a space
         */
        if (*pzScan == NUL)
            break;

        if (! IS_WHITESPACE_CHAR(*pzScan))
            AG_ABEND_IN(pT, mac, FILL_IN_VAL_NO_SEP);

        /*
         *  Terminate the string value and skip over any additional space
         */
        *(pzScan++) = NUL;
        pzScan = SPN_WHITESPACE_CHARS(pzScan);
    }
}

/*
 *  parse_mac_args
 *
 *  This routine is called just before the first call to mFunc_Define
 *  for a particular macro invocation.  It scans the text of the invocation
 *  for name-value assignments that are only to live for the duration
 *  of the processing of the user defined macro.
 */
LOCAL void
parse_mac_args(templ_t * pT, macro_t * mac)
{
    char *       pzScan = pT->td_text + mac->md_txt_off;
    uint_t       ct;
    def_list_t * pDL;
    def_list_t * pN;

    /*
     *  If there is no argument text, then the arg count is zero.
     */
    if (mac->md_txt_off == 0) {
        mac->md_res = 0;
        return;
    }

    ct = count_named_values(pT, mac);

    /*
     *  The result is zero if we don't have any
     */
    mac->md_sib_idx = ct;
    if (ct == 0) {
        mac->md_txt_off = 0;
        mac->md_res = 0;
        return;
    }

    /*
     *  Allocate the array of definition descriptors
     */
    pzScan = pT->td_text + mac->md_txt_off;
    pDL = (def_list_t *)AGALOC(ct * sizeof(def_list_t), "array of def desc");
    memset((void*)pDL, 0, ct * sizeof(def_list_t));
    mac->md_res = (uintptr_t)pDL;

    /*
     *  Fill in the array of value assignments
     */
    fill_in_values(pDL, pzScan, pT, mac);

    if (ct > 1) {
        /*
         *  There was more than one value assignment.
         *  Sort them just so we know the siblings are together.
         *  Order is preserved by comparing string addresses,
         *  if the strings compare equal.
         */
        pDL = (def_list_t *)mac->md_res;
        qsort((void*)pDL, (size_t)ct, sizeof(def_list_t), order_def_list);

        /*
         *  Now, link them all together.  Singly linked list.
         */
        for (;;) {
            if (--ct == 0) {
                pDL->de.de_next = NULL;
                break;
            }

            pN = pDL + 1;

            /*
             *  IF the next entry has the same name,
             *  THEN it is a "twin".  Link twins on the twin list.
             */
            if (streqvcmp(pDL->de.de_name, pN->de.de_name) == 0) {
                pN = link_twins(pDL, pN, (int*)&ct);
                if (ct <= 0)
                    break;  /* pN is now invalid */
            }

            pDL->de.de_next = &(pN->de);
            pDL = pN;
        }
    }
}

/**
 * prepare the args for INVOKE macro.
 * See if there's any text following the name of the DEFINE macro to invoke.
 * If there is, then set up the arguments now so it's easy to deal with
 * next time around.  The name of the macro to invoke may be dynamic.
 * "skip_expr" skips over either a name or a scheme expression that
 * is supposed to yield a name.
 *
 * @param mac  the macro structure describing the invocation
 */
static void
prep_invoke_args(macro_t * mac)
{
    char * pzText;
    templ_t * pT = current_tpl;

    if (mac->md_txt_off == 0)
        AG_ABEND_IN(pT, mac, PREP_INVOKE_NO_NAME);
    mac->md_name_off = mac->md_txt_off;
    pzText = pT->td_text + mac->md_txt_off;
    pzText = (char*)skip_expr(pzText, strlen(pzText));

    /*
     *  IF there is no more text,
     *  THEN there are no arguments
     */
    if (*pzText == NUL) {
        mac->md_txt_off = 0;
        mac->md_res = 0;
    }

    /*
     *  OTHERWISE, skip to the start of the text and process
     *  the arguments to the macro
     */
    else {
        if (! IS_WHITESPACE_CHAR(*pzText))
            AG_ABEND_IN(pT, mac, PREP_INVOKE_NO_SEP);
        *pzText = NUL;
        pzText = SPN_WHITESPACE_CHARS(pzText + 1);
        mac->md_txt_off = pzText - pT->td_text;
        parse_mac_args(pT, mac);
        current_tpl = pT;
    }
}

/*=macfunc DEBUG
 *
 *  handler-proc:
 *  load-proc:
 *
 *  what:  Print debug message to trace output
 *  desc:
 *
 *      If the tracing level is at "debug-message" or above
 *      (@pxref{autogen trace}), this macro prints a debug message to trace
 *      output.  This message is not evaluated.  This macro can also be used to
 *      set useful debugger breakpoints.  By inserting [+DEBUG n+] into your
 *      template, you can set a debugger breakpoint on the #n case element
 *      below (in the AutoGen source) and step through the processing of
 *      interesting parts of your template.
 *
 *      To be useful, you have to have access to the source tree where autogen
 *      was built and the template being processed.  The definitions are also
 *      helpful, but not crucial.  Please contact the author if you think you
 *      might actually want to use this.
=*/
macro_t *
mFunc_Debug(templ_t * pT, macro_t * mac)
{
    static int dummy = 0;
    char const * pz  = pT->td_text + mac->md_txt_off;
    int  for_index = (curr_ivk_info->ii_for_depth <= 0)
        ? -1
        : curr_ivk_info->ii_for_data[ curr_ivk_info->ii_for_depth-1].for_index;

    fprintf(trace_fp, FN_DEBUG, pz, for_index);

    /*
     *  The case element values were chosen to thwart most
     *  optimizers that might be too bright for its own good.
     *  (`dummy' is write-only and could be ignored)
     */
    do  {
        if (IS_DEC_DIGIT_CHAR(*pz)) {
            for_index = atoi(pz);
            break;
        }
    } while (*(pz++) != NUL);

    if (for_index < 0)
        for_index = -1;

    switch (for_index) {
    case -1:   dummy = 'X'; break;
    case 0:    dummy = 'A'; break;
    case 1:    dummy = 'u'; break;
    case 2:    dummy = 't'; break;
    case 3:    dummy = 'o'; break;
    case 4:    dummy = 'G'; break;
    case 5:    dummy = 'e'; break;
    case 6:    dummy = 'n'; break;
    case 7:    dummy = 'N'; break;
    case 8:    dummy = 'U'; break;
    case 9:    dummy = 'T'; break;
    case 10:   dummy = '.'; break;
    default:   dummy++;
    }
    if (IS_GRAPHIC_CHAR(dummy))
        fprintf(trace_fp, FN_DEBUG_GRAPHIC, dummy);
    putc(NL, trace_fp);
    return mac+1;
}

/**
 *  Build up a definition context.
 *  It is created by passed-in macro arguments.
 *
 * @param def_ct    number of definitions
 * @param def_list  list of definitions
 */
static void
build_defs(int def_ct, def_list_t * def_list)
{
    curr_def_ctx.dcx_defent = &(def_list->de);

    /*
     *  FOR each definition, evaluate the associated expression
     *      and set the text value to it.
     */
    do  {
        if (def_list->pzExpr == NULL)
            continue;

    retryExpression:
        switch (*(def_list->pzExpr)) {
        case ';':
        {
            char* pz = strchr(def_list->pzExpr, NL);
            if (pz != NULL) {
                pz = SPN_WHITESPACE_CHARS(pz + 1);
                def_list->pzExpr = pz;
                goto retryExpression;
            }
            /* FALLTHROUGH */
        }
        case NUL:
            def_list->pzExpr = NULL;
            def_list->de.de_val.dvu_text = (char*)zNil;
            break;

        case '(':
        {
            SCM res;

            /*
             *  It is a scheme expression.  Accept only string
             *  and number results.
             */
            if (OPT_VALUE_TRACE >= TRACE_EXPRESSIONS) {
                fprintf(trace_fp, TRACE_BUILD_DEFS,
                        cur_macro->md_sib_idx - def_ct, def_list->pzExpr);
            }

            res = ag_eval(def_list->pzExpr);
            if (AG_SCM_STRING_P(res)) {
                AGDUPSTR(def_list->de.de_val.dvu_text,
                         ag_scm2zchars(res, "res"), "ev res");
            }
            else if (AG_SCM_NUM_P(res)) {
                def_list->de.de_val.dvu_text = AGALOC(16, "num buf");
                snprintf(def_list->de.de_val.dvu_text, (size_t)16,
                         BUILD_DEFS_LONG_FMT, AG_SCM_TO_ULONG(res));
            }
            else
                AGDUPSTR(def_list->de.de_val.dvu_text, zNil, "nil str");
            break;
        }

        case '`':
            if (OPT_VALUE_TRACE >= TRACE_EXPRESSIONS) {
                fprintf(trace_fp, TRACE_BUILD_DEFS,
                        cur_macro->md_sib_idx - def_ct, def_list->pzExpr+1);
            }
            def_list->de.de_val.dvu_text = shell_cmd(def_list->pzExpr+1);
            break;
        }
    } while (def_list++, --def_ct > 0);
}

/*=macfunc DEFINE
 *
 *  what:    Define a user AutoGen macro
 *  cindex:  define macro
 *  handler_proc:
 *  load_proc:
 *  unload-proc:
 *
 *  desc:
 *
 *  This function will define a new macro.  You must provide a name for the
 *  macro.  You do not specify any arguments, though the invocation may
 *  specify a set of name/value pairs that are to be active during the
 *  processing of the macro.
 *
 *  @example
 *  [+ define foo +]
 *  ... macro body with macro functions ...
 *  [+ enddef +]
 *  ... [+ foo bar='raw text' baz=<<text expression>> +]
 *  @end example
 *
 *  Once the macro has been defined, this new macro can be invoked by
 *  specifying the macro name as the first token after the start macro marker.
 *  Alternatively, you may make the invocation explicitly invoke a defined
 *  macro by specifying @code{INVOKE} (@pxref{INVOKE}) in the macro
 *  invocation.  If you do that, the macro name can be computed with an
 *  expression that gets evaluated every time the INVOKE macro is encountered.
 *
 *  Any remaining text in the macro invocation will be used to create new
 *  name/value pairs that only persist for the duration of the processing of
 *  the macro.  The expressions are evaluated the same way basic
 *  expressions are evaluated.  @xref{expression syntax}.
 *
 *  The resulting definitions are handled much like regular
 *  definitions, except:
 *
 *  @enumerate
 *  @item
 *  The values may not be compound.  That is, they may not contain
 *  nested name/value pairs.
 *  @item
 *  The bindings go away when the macro is complete.
 *  @item
 *  The name/value pairs are separated by whitespace instead of
 *  semi-colons.
 *  @item
 *  Sequences of strings are not concatenated.
 *  @end enumerate
 *
 *  @quotation
 *  @strong{NB:} The macro is extracted from the template as the template is
 *  scanned.  You cannot conditionally define a macro by enclosing it in an
 *  @code{IF}/@code{ENDIF} (@pxref{IF}) macro pair.  If you need to dynamically
 *  select the format of a @code{DEFINE}d macro, then put the flavors into
 *  separate template files that simply define macros.  @code{INCLUDE}
 *  (@pxref{INCLUDE}) the appropriate template when you have computed which
 *  you need.
 *  @end quotation
 *
 *  Due to this, it is acceptable and even a good idea to place all the
 *  @code{DEFINE} macros at the end of the template.  That puts the main
 *  body of the template at the beginning of the file.
=*/
/*=macfunc ENDDEF
 *
 *  what:   Ends a macro definition.
 *  in-context:
 *
 *  desc:
 *    This macro ends the @code{DEFINE} function template block.
 *    For a complete description @xref{DEFINE}.
=*/
/**
 *  This routine runs the invocation of a defined macro.
 *
 * @param tpl not used
 * @param[in] mac the macro that holds the data for the defined macro
 */
macro_t *
mFunc_Define(templ_t * tpl, macro_t * mac)
{
    def_list_t * pList  = (def_list_t *)mac->md_res;
    int          defCt  = mac->md_sib_idx;
    def_ctx_t    ctx;

    if (OPT_VALUE_TRACE > TRACE_NOTHING) {
        tpl = (templ_t*)mac->md_pvt;

        fprintf(trace_fp, TPL_INVOKED, tpl->td_name, defCt);
        if (OPT_VALUE_TRACE == TRACE_EVERYTHING)
            fprintf(trace_fp, TAB_FILE_LINE_FMT,
                    current_tpl->td_file, mac->md_line);
    }

    /*
     *  IF we have no special definitions, then do not nest definitions
     */
    if (defCt != 0) {
        ctx  = curr_def_ctx;
        curr_def_ctx.dcx_prev = &ctx;
        build_defs(defCt, pList);
    }

    gen_new_block((templ_t*)mac->md_pvt);

    if (defCt != 0)
        curr_def_ctx = ctx;

    if ((defCt = mac->md_sib_idx) > 0) {
        pList = (def_list_t *)mac->md_res;
        while (defCt-- > 0) {
            if (pList->pzExpr != NULL) {
                AGFREE((void*)pList->de.de_val.dvu_text);
                pList->de.de_val.dvu_text = NULL;
            }
            pList++;
        }
    }

    return mac+1;
}

/**
 * unload a defined macro
 *
 * @param[in,out] mac macro containing the data to unload
 */
void
mUnload_Define(macro_t * mac)
{
    void * p = (void*)(mac->md_res);
    if (p != NULL)
        AGFREE(p);
}

/*=macfunc INVOKE
 *
 *  handler_proc:
 *  what:  Invoke a User Defined Macro
 *
 *  desc:
 *
 *  User defined macros may be invoked explicitly or implicitly.
 *  If you invoke one implicitly, the macro must begin with the
 *  name of the defined macro.  Consequently, this may @strong{not}
 *  be a computed value.  If you explicitly invoke a user defined macro,
 *  the macro begins with the macro name @code{INVOKE} followed by
 *  a @i{basic expression} that must yield a known user defined macro.
 *  A macro name _must_ be found, or AutoGen will issue a diagnostic
 *  and exit.
 *
 *  Arguments are passed to the invoked macro by name.
 *  The text following the macro name must consist of a series of
 *  names each of which is followed by an equal sign (@code{=}) and
 *  a @i{basic expression} that yields a string.
 *
 *  The string values may contain template macros that are parsed
 *  the first time the macro is processed and evaluated again every
 *  time the macro is evaluated.
=*/
macro_t *
mFunc_Invoke(templ_t * tpl, macro_t * mac)
{
    /*
     *  IF this is the first time through,
     *  THEN separate the name from the rest of the arguments.
     */
    if (mac->md_name_off == 0) {
        prep_invoke_args(mac);

        /*
         *  IF the name is constant and not an expression,
         *  THEN go find the template now and bind the macro call
         *       to a particular template macro
         */
        if (IS_VAR_FIRST_CHAR(tpl->td_text[ mac->md_name_off ])) {
            mac->md_code = FTYP_DEFINE;
            mac->md_pvt  = (void*)find_tpl(tpl->td_text + mac->md_name_off);

            if (mac->md_pvt == NULL) {
                char const * p = tpl->td_text + mac->md_name_off;
                AG_ABEND_IN(tpl, mac, aprf(BAD_MAC_NM_FMT, p));
                /* NOTREACHED */
            }

            return mFunc_Define(tpl, mac);
        }
    }

    /*
     *  Call `eval' to determine the macro name.  Every invocation
     *  may be different!!
     */
    {
        SCM    macName = eval(tpl->td_text + mac->md_name_off);
        char * pz = ag_scm2zchars(macName, "mac name");
        templ_t * ntpl = find_tpl(pz);
        if (ntpl == NULL) {
            pz = aprf(BAD_MAC_NM_FMT, pz);
            AG_ABEND_IN(tpl, mac, pz);
            /* NOTREACHED */
        }

        mac->md_pvt = (void*)ntpl;
    }
    return mFunc_Define(tpl, mac);
}

/**
 * Loads the debug function for load time breakpoints.
 * @param pT     containing template
 * @param pMac   the debug macro data
 * @param ppzSan pointer to scanning pointer
 * @returns      the next open macro slot
 */
macro_t *
mLoad_Debug(templ_t * pT, macro_t * pMac, char const ** ppzScan)
{
    if (OPT_VALUE_TRACE >= TRACE_DEBUG_MESSAGE)
        return mLoad_Unknown(pT, pMac, ppzScan);
    return mLoad_Comment(pT, pMac, ppzScan);
}

static templ_t *
new_template(templ_t * base_tpl, macro_t * mac, char const * scan)
{
    templ_t * ntpl;
    char * copy;
    char const * src = (char const *)mac->md_txt_off;
    int ct = base_tpl->td_mac_ct - (mac - base_tpl->td_macros);
    size_t aloc_sz =
        sizeof(*ntpl) + (ct * sizeof(macro_t)) + strlen(scan) + 0x100;
    aloc_sz &= ~0x0F;

    /*
     *  Allocate a new template block that is much larger than needed.
     */
    ntpl = (templ_t*)AGALOC(aloc_sz, "new tpl");
    memset((void*)ntpl, 0, aloc_sz);
    ntpl->td_magic  = base_tpl->td_magic;
    ntpl->td_size   = aloc_sz;
    ntpl->td_mac_ct = ct;
    ntpl->td_file   = strdup(base_tpl->td_file);

    copy = ntpl->td_name = (void*)(ntpl->td_macros + ct);
    if (! IS_VAR_FIRST_CHAR(*src))
        AG_ABEND_IN(base_tpl, mac, LD_DEF_NEED_NAME);

    while (IS_VALUE_NAME_CHAR(*src))
        *(copy++) = *(src++);

    *(copy++) = NUL;

    if (OPT_VALUE_TRACE >= TRACE_BLOCK_MACROS)
        fprintf(trace_fp, TRACE_MACRO_DEF, ntpl->td_name, ntpl->td_file);

    ntpl->td_text = copy;
    ntpl->td_scan = copy+1;
    strcpy(ntpl->td_start_mac, base_tpl->td_start_mac);
    strcpy(ntpl->td_end_mac,   base_tpl->td_end_mac);
    current_tpl = ntpl;

    return ntpl;
}

static void
load_define_tpl(templ_t * tpl, char const ** ppzScan)
{
    macro_t * last_mac = parse_tpl(tpl->td_macros, ppzScan);
    int     ct;

    /*
     *  Make sure all of the input string was *NOT* scanned.
     */
    if (*ppzScan == NULL)
        AG_ABEND_IN(tpl, tpl->td_macros, LD_DEF_WOOPS);

    ct = last_mac - tpl->td_macros;

    /*
     *  IF there are empty macro slots,
     *  THEN pack the text
     */
    if (ct < tpl->td_mac_ct) {
        int    delta = sizeof(macro_t) * (tpl->td_mac_ct - ct);
        void * data  = (tpl->td_name == NULL) ? tpl->td_text : tpl->td_name;
        size_t size  = tpl->td_scan - (char*)data;
        memmove((void*)last_mac, data, size);

        tpl->td_text  -= delta;
        tpl->td_scan  -= delta;
        tpl->td_name  -= delta;
        tpl->td_mac_ct = ct;
    }
}

macro_t *
mLoad_Define(templ_t * ori_tpl, macro_t * mac, char const ** p_scan)
{
    static load_proc_p_t apDefineLoad[ FUNC_CT ] = { NULL };

    templ_t * new_tpl;

    /**
     *  Save the global macro loading mode
     */
    load_proc_p_t const * save_load_procs = load_proc_table;

    if (mac->md_txt_off == 0)
        AG_ABEND_IN(ori_tpl, mac, LD_DEF_NEED_NAME);

    /*
     *  IF this is the first time here, THEN set up the "DEFINE" block
     *  callout table.  It is the standard table, except entries are
     *  inserted for functions that are enabled only while processing
     *  a DEFINE block (viz. "ENDDEF" and removing "DEFINE").
     */
    if (apDefineLoad[0] == NULL) {
        memcpy((void*)apDefineLoad, base_load_table, sizeof(base_load_table));
        apDefineLoad[ FTYP_ENDDEF ] = &mLoad_Ending;
        apDefineLoad[ FTYP_DEFINE ] = &mLoad_Bogus;
    }

    load_proc_table = apDefineLoad;
    defining_macro  = true;
    new_tpl = new_template(ori_tpl, mac, *p_scan);
    load_define_tpl(new_tpl, p_scan);
    defining_macro  = false;

    /*
     *  Adjust the sizes.  Remove absolute pointers.  Reallocate to the correct
     *  size.  Restore the offsets to pointer values.
     */
    {
        size_t sz = new_tpl->td_scan - (char*)new_tpl;
        if (sz < new_tpl->td_size) {
            new_tpl->td_size = sz;
            new_tpl->td_name -= (long)new_tpl;
            new_tpl->td_text -= (long)new_tpl;
            new_tpl = AGREALOC((void*)new_tpl, new_tpl->td_size, "resize mac");
            new_tpl->td_name += (long)new_tpl;
            new_tpl->td_text += (long)new_tpl;
        }
    }

#if defined(DEBUG_ENABLED)
    if (HAVE_OPT(SHOW_DEFS)) {
        static char const zSum[] = "loaded %d macros from %s\n"
            "\tBinary template size:  0x%X\n\n";
        fprintf(trace_fp, zSum, new_tpl->td_mac_ct, new_tpl->td_file,
                (unsigned int)new_tpl->td_size);
    }
#endif

    new_tpl->td_scan = (char*)named_tpls;
    named_tpls      = new_tpl;
    load_proc_table = save_load_procs;
    memset((void*)mac, 0, sizeof(*mac));
    current_tpl     = ori_tpl;
    return mac;
}
/*
 * Local Variables:
 * mode: C
 * c-file-style: "stroustrup"
 * indent-tabs-mode: nil
 * End:
 * end of agen5/funcDef.c */