ap_ctx.c

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 * on public domain software written at the National Center for
 * Supercomputing Applications, University of Illinois, Urbana-Champaign.
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/*
**  Generic Context Interface for Apache
**  Written by Ralf S. Engelschall <[e-mail]> 
*/

#ifdef EAPI

#include "httpd.h"
#include "ap_config.h"
#include "ap_ctx.h"

API_EXPORT(ap_ctx *) ap_ctx_new(pool *p)
{
    ap_ctx *ctx;
    int i;

    if (p != NULL) {
        ctx = (ap_ctx *)ap_palloc(p, sizeof(ap_ctx_rec));
        ctx->cr_pool = p;
        ctx->cr_entry = (ap_ctx_entry **)
            ap_palloc(p, sizeof(ap_ctx_entry *)*(AP_CTX_MAX_ENTRIES+1));
    }
    else {
        ctx = (ap_ctx *)malloc(sizeof(ap_ctx_rec));
        ctx->cr_pool = NULL;
        ctx->cr_entry = (ap_ctx_entry **)
            malloc(sizeof(ap_ctx_entry *)*(AP_CTX_MAX_ENTRIES+1));
    }
    for (i = 0; i < AP_CTX_MAX_ENTRIES+1; i++) 
        ctx->cr_entry[i] = NULL;
    return ctx;
}

API_EXPORT(void) ap_ctx_set(ap_ctx *ctx, char *key, void *val)
{
    int i;
    ap_ctx_entry *ce;

    ce = NULL;
    for (i = 0; ctx->cr_entry[i] != NULL; i++) {
        if (strcmp(ctx->cr_entry[i]->ce_key, key) == 0) {
            ce = ctx->cr_entry[i];
            break;
        }
    }
    if (ce == NULL) {
        if (i == AP_CTX_MAX_ENTRIES)
            return;
        if (ctx->cr_pool != NULL) {
            ce = (ap_ctx_entry *)ap_palloc(ctx->cr_pool, sizeof(ap_ctx_entry));
            ce->ce_key = ap_pstrdup(ctx->cr_pool, key);
        }
        else {
            ce = (ap_ctx_entry *)malloc(sizeof(ap_ctx_entry));
            ce->ce_key = strdup(key);
        }
        ctx->cr_entry[i] = ce;
        ctx->cr_entry[i+1] = NULL;
    }
    ce->ce_val = val;
    return;
}

API_EXPORT(void *) ap_ctx_get(ap_ctx *ctx, char *key)
{
    int i;

    for (i = 0; ctx->cr_entry[i] != NULL; i++)
        if (strcmp(ctx->cr_entry[i]->ce_key, key) == 0)
            return ctx->cr_entry[i]->ce_val;
    return NULL;
}

API_EXPORT(ap_ctx *) ap_ctx_overlay(pool *p, ap_ctx *over, ap_ctx *base)
{
    ap_ctx *new;
    int i;

#ifdef POOL_DEBUG
    if (p != NULL) {
        if (!ap_pool_is_ancestor(over->cr_pool, p))
            ap_log_assert("ap_ctx_overlay: overlay's pool is not an ancestor of p", 
                          __FILE__, __LINE__);
        if (!ap_pool_is_ancestor(base->cr_pool, p))
            ap_log_assert("ap_ctx_overlay: base's pool is not an ancestor of p",
                          __FILE__, __LINE__);
    }
#endif
    if ((new = ap_ctx_new(p)) == NULL)
        return NULL;
    memcpy(new->cr_entry, base->cr_entry, 
           sizeof(ap_ctx_entry *)*(AP_CTX_MAX_ENTRIES+1));
    for (i = 0; over->cr_entry[i] != NULL; i++)
        ap_ctx_set(new, over->cr_entry[i]->ce_key, over->cr_entry[i]->ce_val);
    return new;
}

#endif /* EAPI */