ap_ctx.h

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 * on public domain software written at the National Center for
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/*
**  Generic Context Interface for Apache
**  Written by Ralf S. Engelschall <[e-mail]> 
*/

#ifdef EAPI

#ifndef AP_CTX_H
#define AP_CTX_H

#ifndef FALSE
#define FALSE 0
#define TRUE  !FALSE
#endif

/*
 * Internal Context Record Definition
 */

#define AP_CTX_MAX_ENTRIES 1024

typedef struct {
    char *ce_key;
    void *ce_val;
} ap_ctx_entry;

typedef struct {
    pool          *cr_pool;
    ap_ctx_entry **cr_entry;
} ap_ctx_rec;

typedef ap_ctx_rec ap_ctx;

/*
 * Some convinience macros for storing _numbers_ 0...n in contexts, i.e.
 * treating numbers as pointers but keeping track of the NULL return code of
 * ap_ctx_get.
 */
#define AP_CTX_NUM2PTR(n) (void *)(((unsigned long)(n))+1)
#define AP_CTX_PTR2NUM(p) (unsigned long)(((char *)(p))-1)

/*
 * Prototypes for Context Handling Functions
 */

API_EXPORT(ap_ctx *)ap_ctx_new(pool *p);
API_EXPORT(void)    ap_ctx_set(ap_ctx *ctx, char *key, void *val);
API_EXPORT(void *)  ap_ctx_get(ap_ctx *ctx, char *key);
API_EXPORT(ap_ctx *)ap_ctx_overlay(pool *p, ap_ctx *over, ap_ctx *base);

#endif /* AP_CTX_H */

#endif /* EAPI */