[mmh] / uip / mhfree.c

/*
** mhfree.c -- routines to free the data structures used to
**          -- represent MIME messages
**
** This code is Copyright (c) 2002, by the authors of nmh.  See the
** COPYRIGHT file in the root directory of the nmh distribution for
** complete copyright information.
*/

#include <h/mh.h>
#include <errno.h>
#include <h/mime.h>
#include <h/mhparse.h>
#include <unistd.h>

/* The list of top-level contents to display */
CT *cts = NULL;

/*
** prototypes
*/
void free_content(CT);
void free_header(CT);
void free_ctinfo(CT);
void free_encoding(CT, int);
void freects_done();

/*
** static prototypes
*/
static void free_text(CT);
static void free_multi(CT);
static void free_partial(CT);


/*
** Primary routine to free a MIME content structure
*/

void
free_content(CT ct)
{
        if (!ct)
                return;

        /*
        ** free all the header fields
        */
        free_header(ct);

        if (ct->c_partno)
                free(ct->c_partno);

        if (ct->c_vrsn)
                free(ct->c_vrsn);

        if (ct->c_ctline)
                free(ct->c_ctline);

        free_ctinfo(ct);

        /*
        ** some of the content types have extra
        ** parts which need to be freed.
        */
        switch (ct->c_type) {
        case CT_MULTIPART:
                free_multi(ct);
                break;

        case CT_MESSAGE:
                if (ct->c_subtype == MESSAGE_PARTIAL) {
                        free_partial(ct);
                }
                break;

        case CT_TEXT:
                free_text(ct);
                break;
        }

        if (ct->c_charset)
                free(ct->c_charset);
        if (ct->c_showproc)
                free(ct->c_showproc);
        if (ct->c_storeproc)
                free(ct->c_storeproc);

        if (ct->c_celine)
                free(ct->c_celine);

        /* free structures for content encodings */
        free_encoding(ct, 1);

        if (ct->c_id)
                free(ct->c_id);
        if (ct->c_descr)
                free(ct->c_descr);
        if (ct->c_dispo)
                free(ct->c_dispo);

        if (ct->c_file) {
                if (ct->c_unlink)
                        unlink(ct->c_file);
                free(ct->c_file);
        }
        if (ct->c_fp)
                fclose(ct->c_fp);

        if (ct->c_storage)
                free(ct->c_storage);
        if (ct->c_folder)
                free(ct->c_folder);

        free(ct);
}


/*
** Free the linked list of header fields
** for this content.
*/

void
free_header(CT ct)
{
        HF hp1, hp2;

        hp1 = ct->c_first_hf;
        while (hp1) {
                hp2 = hp1->next;

                free(hp1->name);
                free(hp1->value);
                free(hp1);

                hp1 = hp2;
        }

        ct->c_first_hf = NULL;
        ct->c_last_hf  = NULL;
}


void
free_ctinfo(CT ct)
{
        char **ap;
        CI ci;

        ci = &ct->c_ctinfo;
        if (ci->ci_type) {
                free(ci->ci_type);
                ci->ci_type = NULL;
        }
        if (ci->ci_subtype) {
                free(ci->ci_subtype);
                ci->ci_subtype = NULL;
        }
        for (ap = ci->ci_attrs; *ap; ap++) {
                free(*ap);
                *ap = NULL;
        }
        if (ci->ci_comment) {
                free(ci->ci_comment);
                ci->ci_comment = NULL;
        }
        if (ci->ci_magic) {
                free(ci->ci_magic);
                ci->ci_magic = NULL;
        }
}


static void
free_text(CT ct)
{
        struct text *t;

        if (!(t = (struct text *) ct->c_ctparams))
                return;

        free((char *) t);
        ct->c_ctparams = NULL;
}


static void
free_multi(CT ct)
{
        struct multipart *m;
        struct part *part, *next;

        if (!(m = (struct multipart *) ct->c_ctparams))
                return;

        if (m->mp_start)
                free(m->mp_start);
        if (m->mp_stop)
                free(m->mp_stop);

        for (part = m->mp_parts; part; part = next) {
                next = part->mp_next;
                free_content(part->mp_part);
                free((char *) part);
        }
        m->mp_parts = NULL;

        free((char *) m);
        ct->c_ctparams = NULL;
}


static void
free_partial(CT ct)
{
        struct partial *p;

        if (!(p = (struct partial *) ct->c_ctparams))
                return;

        if (p->pm_partid)
                free(p->pm_partid);

        free((char *) p);
        ct->c_ctparams = NULL;
}


/*
** Free data structures related to encoding/decoding
** Content-Transfer-Encodings.
*/

void
free_encoding(CT ct, int toplevel)
{
        CE ce;

        if (!(ce = ct->c_cefile))
                return;

        if (ce->ce_fp) {
                fclose(ce->ce_fp);
                ce->ce_fp = NULL;
        }

        if (ce->ce_file) {
                if (ce->ce_unlink)
                        unlink(ce->ce_file);
                free(ce->ce_file);
                ce->ce_file = NULL;
        }

        if (toplevel) {
                free((char *) ce);
                ct->c_cefile = NULL;
        } else {
                ct->c_ceopenfnx = NULL;
        }
}


void
freects_done()
{
        CT *ctp;

        if ((ctp = cts)) {
                for (; *ctp; ctp++){
                        free_content(*ctp);
                }
        }
}