mirror of https://github.com/tailix/libkernaux.git
80 lines
2.2 KiB
C
80 lines
2.2 KiB
C
#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "../assert.h"
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#include <kernaux/multiboot2.h>
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#include <stddef.h>
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#include <stdint.h>
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const struct KernAux_Multiboot2_ITagBase
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*KernAux_Multiboot2_Info_first_tag_with_type(
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const struct KernAux_Multiboot2_Info *const multiboot2_info,
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const uint32_t tag_type
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) {
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KERNAUX_NOTNULL(multiboot2_info);
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const struct KernAux_Multiboot2_ITagBase *tag_base =
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(struct KernAux_Multiboot2_ITagBase*)
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KERNAUX_MULTIBOOT2_DATA(multiboot2_info);
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while (tag_base <
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(struct KernAux_Multiboot2_ITagBase*)
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((uint8_t*)multiboot2_info + multiboot2_info->total_size))
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{
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if (!KernAux_Multiboot2_ITagBase_is_valid(tag_base)) return NULL;
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if (tag_base->type == tag_type) return tag_base;
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tag_base = KERNAUX_MULTIBOOT2_ITAG_NEXT(tag_base);
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}
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return NULL;
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}
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const struct KernAux_Multiboot2_ITagBase
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*KernAux_Multiboot2_Info_tag_with_type_after(
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const struct KernAux_Multiboot2_Info *const multiboot2_info,
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const uint32_t tag_type,
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const struct KernAux_Multiboot2_ITagBase *const after_tag
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) {
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KERNAUX_NOTNULL(multiboot2_info);
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KERNAUX_NOTNULL(after_tag);
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const struct KernAux_Multiboot2_ITagBase *tag_base =
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(struct KernAux_Multiboot2_ITagBase*)
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KERNAUX_MULTIBOOT2_DATA(multiboot2_info);
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KERNAUX_ASSERT(tag_base <= after_tag);
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while (tag_base <
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(struct KernAux_Multiboot2_ITagBase*)
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((uint8_t*)multiboot2_info + multiboot2_info->total_size))
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{
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if (!KernAux_Multiboot2_ITagBase_is_valid(tag_base)) return NULL;
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if (tag_base->type == tag_type && tag_base > after_tag) return tag_base;
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tag_base = KERNAUX_MULTIBOOT2_ITAG_NEXT(tag_base);
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}
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return NULL;
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}
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const char *KernAux_Multiboot2_Info_boot_cmd_line(
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const struct KernAux_Multiboot2_Info *const multiboot2_info
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) {
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KERNAUX_NOTNULL(multiboot2_info);
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const struct KernAux_Multiboot2_ITag_BootCmdLine *const tag =
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(struct KernAux_Multiboot2_ITag_BootCmdLine*)
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KernAux_Multiboot2_Info_first_tag_with_type(
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multiboot2_info,
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KERNAUX_MULTIBOOT2_ITAG_BOOT_CMD_LINE
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);
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if (!tag) return NULL;
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return (char*)KERNAUX_MULTIBOOT2_DATA(tag);
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}
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