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111 lines
1.9 KiB
111 lines
1.9 KiB
13 years ago
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/**
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* @file param.c
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*
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* Global parameter store.
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*/
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#include <string.h>
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#include <stdbool.h>
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#include <unistd.h>
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#include "param.h"
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/**
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* Array of static parameter info.
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*/
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extern char __param_start, __param_end;
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static const struct param_info_s *param_info_base = (struct param_info_s *)&__param_start;
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static const struct param_info_s *param_info_limit = (struct param_info_s *)&__param_end;
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#define param_info_count ((unsigned)(param_info_limit - param_info_base))
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static bool
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handle_in_range(param_t handle)
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{
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return (handle < param_info_count);
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}
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param_t
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param_find(const char *name)
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{
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param_t param;
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for (param = 0; handle_in_range(param); param++) {
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if (!strcmp(param_info_base[param].name, name))
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return param;
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}
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/* not found */
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return PARAM_INVALID;
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}
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enum
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param_type_e param_type(param_t param)
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{
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if (handle_in_range(param))
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return param_info_base[param].type;
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return PARAM_TYPE_UNKNOWN;
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}
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size_t
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param_size(param_t param)
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{
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if (handle_in_range(param)) {
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switch (param_info_base[param].type) {
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case PARAM_TYPE_INT32:
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case PARAM_TYPE_FLOAT:
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return 4;
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case PARAM_TYPE_STRUCT ... PARAM_TYPE_STRUCT_MAX:
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return param_info_base[param].type - PARAM_TYPE_STRUCT;
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default:
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return 0;
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}
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}
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return 0;
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}
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int
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param_get(param_t param, void *val)
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{
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if (handle_in_range(param)) {
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/* XXX look for updated value stored elsewhere */
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switch (param_info_base[param].type) {
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case PARAM_TYPE_INT32:
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*(int32_t *)val = param_info_base[param].i;
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return 0;
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case PARAM_TYPE_FLOAT:
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*(float *)val = param_info_base[param].f;
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return 0;
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case PARAM_TYPE_STRUCT ... PARAM_TYPE_STRUCT_MAX:
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memcpy(val, param_info_base[param].p, param_size(param));
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return 0;
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default:
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return -1;
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}
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}
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return -1;
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}
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int
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param_set(param_t param, void *val)
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{
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if (handle_in_range(param)) {
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/* XXX maintain list of changed values */
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}
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return -1;
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}
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