nginx/src/core/ngx_conf_file.h

#ifndef _NGX_HTTP_CONF_FILE_H_INCLUDED_
#define _NGX_HTTP_CONF_FILE_H_INCLUDED_


#include <ngx_config.h>
#include <ngx_core.h>


/*
 *        AAAA  number of agruments
 *      FF      command flags
 *    TT        command type, i.e. HTTP "location" or "server" command
 */

#define NGX_CONF_NOARGS      0x00000001
#define NGX_CONF_TAKE1       0x00000002
#define NGX_CONF_TAKE2       0x00000004
#define NGX_CONF_TAKE3       0x00000008
#define NGX_CONF_TAKE4       0x00000010
#define NGX_CONF_TAKE5       0x00000020
#define NGX_CONF_TAKE6       0x00000040
#define NGX_CONF_TAKE7       0x00000080

#define NGX_CONF_TAKE12      (NGX_CONF_TAKE1|NGX_CONF_TAKE2)
#define NGX_CONF_TAKE13      (NGX_CONF_TAKE1|NGX_CONF_TAKE3)

#define NGX_CONF_TAKE23      (NGX_CONF_TAKE2|NGX_CONF_TAKE3)

#define NGX_CONF_TAKE1234    (NGX_CONF_TAKE1|NGX_CONF_TAKE2|NGX_CONF_TAKE3   \
                              |NGX_CONF_TAKE4)

#define NGX_CONF_ARGS_NUMBER 0x000000ff
#define NGX_CONF_BLOCK       0x00000100
#define NGX_CONF_FLAG        0x00000200
#define NGX_CONF_ANY         0x00000400
#define NGX_CONF_1MORE       0x00000800
#define NGX_CONF_2MORE       0x00001000

#define NGX_DIRECT_CONF      0x00010000

#define NGX_MAIN_CONF        0x01000000
#define NGX_ANY_CONF         0x0F000000



#define NGX_CONF_UNSET       -1
#define NGX_CONF_UNSET_UINT  (ngx_uint_t) -1
#define NGX_CONF_UNSET_PTR   (void *) -1
#define NGX_CONF_UNSET_SIZE  (size_t) -1
#define NGX_CONF_UNSET_MSEC  (ngx_msec_t) -1


#define NGX_CONF_OK          NULL
#define NGX_CONF_ERROR       (void *) -1

#define NGX_CONF_BLOCK_DONE  1
#define NGX_CONF_FILE_DONE   2

#define NGX_MODULE           0, 0

#define NGX_CORE_MODULE      0x45524F43  /* "CORE" */
#define NGX_CONF_MODULE      0x464E4F43  /* "CONF" */


#define NGX_MAX_CONF_ERRSTR  256


struct ngx_command_s {
    ngx_str_t     name;
    int           type;
    char       *(*set)(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
    int           conf;
    int           offset;
    void         *post;
};

#define ngx_null_command   { ngx_null_string, 0, NULL, 0, 0, NULL }


struct ngx_open_file_s {
    ngx_fd_t   fd;
    ngx_str_t  name;
#if 0
    /* e.g. append mode, error_log */
    int        flags;
    /* e.g. reopen db file */
    int      (*handler)(void *data, ngx_open_file_t *file);
    void      *data;
#endif
};


struct ngx_module_s {
    ngx_uint_t      ctx_index;
    ngx_uint_t      index;
    void           *ctx;
    ngx_command_t  *commands;
    ngx_uint_t      type;
    ngx_int_t     (*init_module)(ngx_cycle_t *cycle);
    ngx_int_t     (*init_process)(ngx_cycle_t *cycle);
#if 0
    ngx_int_t     (*init_thread)(ngx_cycle_t *cycle);
#endif
};


typedef struct {
    ngx_str_t       name;
    void         *(*create_conf)(ngx_cycle_t *cycle);
    char         *(*init_conf)(ngx_cycle_t *cycle, void *conf);
} ngx_core_module_t; 


typedef struct {
    ngx_file_t   file;
    ngx_buf_t   *buffer;
    ngx_uint_t   line;
} ngx_conf_file_t;


typedef char *(*ngx_conf_handler_pt)(ngx_conf_t *cf,
                                     ngx_command_t *dummy, void *conf);


struct ngx_conf_s {
    char                 *name;
    ngx_array_t          *args;

    ngx_cycle_t          *cycle;
    ngx_pool_t           *pool;
    ngx_conf_file_t      *conf_file;
    ngx_log_t            *log;

    void                 *ctx;
    ngx_uint_t            module_type;
    ngx_uint_t            cmd_type;

    ngx_conf_handler_pt   handler;
    char                 *handler_conf;
};


typedef char *(*ngx_conf_post_handler_pt) (ngx_conf_t *cf,
                                           void *data, void *conf);

typedef struct {
    ngx_conf_post_handler_pt  post_handler;
} ngx_conf_post_t;


typedef struct {
    ngx_conf_post_handler_pt  post_handler;
    int                       low;
    int                       high;
} ngx_conf_num_bounds_t;


typedef struct {
    ngx_str_t   name;
    ngx_uint_t  value;
} ngx_conf_enum_t;


#define NGX_CONF_BITMASK_SET  1

typedef struct {
    ngx_str_t   name;
    ngx_uint_t  mask;
} ngx_conf_bitmask_t;


char *ngx_conf_check_num_bounds(ngx_conf_t *cf, void *post, void *data);


#define ngx_get_conf(conf_ctx, module)  conf_ctx[module.index]



#define ngx_conf_init_value(conf, default)                                   \
    if (conf == NGX_CONF_UNSET) {                                            \
        conf = default;                                                      \
    }

#define ngx_conf_init_ptr_value(conf, default)                               \
    if (conf == NGX_CONF_UNSET_PTR) {                                        \
        conf = default;                                                      \
    }

#define ngx_conf_init_unsigned_value(conf, default)                          \
    if (conf == (unsigned) NGX_CONF_UNSET) {                                 \
        conf = default;                                                      \
    }

#define ngx_conf_init_size_value(conf, default)                              \
    if (conf == NGX_CONF_UNSET_SIZE) {                                       \
        conf = default;                                                      \
    }

#define ngx_conf_init_msec_value(conf, default)                              \
    if (conf == NGX_CONF_UNSET_MSEC) {                                       \
        conf = default;                                                      \
    }

#define ngx_conf_merge_value(conf, prev, default)                            \
    if (conf == NGX_CONF_UNSET) {                                            \
        conf = (prev == NGX_CONF_UNSET) ? default : prev;                    \
    }

#define ngx_conf_merge_ptr_value(conf, prev, default)                        \
    if (conf == NULL) {                                                      \
        conf = (prev == NULL) ? default : prev;                              \
    }

#define ngx_conf_merge_unsigned_value(conf, prev, default)                   \
    if (conf == NGX_CONF_UNSET_UINT) {                                       \
        conf = (prev == NGX_CONF_UNSET_UINT) ? default : prev;               \
    }

#define ngx_conf_merge_msec_value(conf, prev, default)                       \
    if (conf == NGX_CONF_UNSET_MSEC) {                                       \
        conf = (prev == NGX_CONF_UNSET_MSEC) ? default : prev;               \
    }

#define ngx_conf_merge_sec_value(conf, prev, default)                        \
    if (conf == NGX_CONF_UNSET) {                                            \
        conf = (prev == NGX_CONF_UNSET) ? default : prev;                    \
    }

#define ngx_conf_merge_size_value(conf, prev, default)                       \
    if (conf == NGX_CONF_UNSET_SIZE) {                                       \
        conf = (prev == NGX_CONF_UNSET_SIZE) ? default : prev;               \
    }

#define ngx_conf_merge_str_value(conf, prev, default)                        \
    if (conf.len == 0) {                                                     \
        if (prev.len) {                                                      \
            conf.len = prev.len;                                             \
            conf.data = prev.data;                                           \
        } else {                                                             \
            conf.len = sizeof(default) - 1;                                  \
            conf.data = (u_char *) default;                                  \
        }                                                                    \
    }

#define ngx_conf_merge_bufs_value(conf, prev, default_num, default_size)     \
    if (conf.num == 0) {                                                     \
        if (prev.num) {                                                      \
            conf.num = prev.num;                                             \
            conf.size = prev.size;                                           \
        } else {                                                             \
            conf.num = default_num;                                          \
            conf.size = default_size;                                        \
        }                                                                    \
    }

#define ngx_conf_merge_bitmask_value(conf, prev, default)                    \
    if (conf == 0) {                                                         \
        conf = (prev == 0) ? default : prev;                                 \
    }


#define addressof(addr)  ((int) &addr)


char *ngx_conf_parse(ngx_conf_t *cf, ngx_str_t *filename);


ngx_open_file_t *ngx_conf_open_file(ngx_cycle_t *cycle, ngx_str_t *name);
void ngx_conf_log_error(ngx_uint_t level, ngx_conf_t *cf, ngx_err_t err,
                        char *fmt, ...);


char *ngx_conf_set_flag_slot(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
char *ngx_conf_set_str_slot(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
char *ngx_conf_set_num_slot(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
char *ngx_conf_set_size_slot(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
char *ngx_conf_set_msec_slot(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
char *ngx_conf_set_sec_slot(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
char *ngx_conf_set_bufs_slot(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
char *ngx_conf_set_enum_slot(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
char *ngx_conf_set_bitmask_slot(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);


extern ngx_uint_t     ngx_max_module;
extern ngx_module_t  *ngx_modules[];


#endif /* _NGX_HTTP_CONF_FILE_H_INCLUDED_ */