912 lines
15 KiB
C
912 lines
15 KiB
C
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/*
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C语言库函数实现
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*/
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#include "stdio.h"
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#include "ff.h"
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#include "errno.h"
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#include "stdlib.h"
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#include "string.h"
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#include "libc.h"
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#include "flash_manager.h"
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#include "bsp_init.h"
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// 常规文件
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#define FILE_TYPE_FILE 0
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// 设备文件
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#define FILE_TYPE_DEVICE 1
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// 内存文件
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#define FILE_TYPE_MEM 2
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// 定义内存文件大小
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#define MEM_FILE_SIZE (100*1024)
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// 定义flash中的文件
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typedef struct
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{
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u32 addr;
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u32 ptr;
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u32 size;
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}libc_flash_file;
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// 定义常规文件
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typedef struct
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{
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libc_flash_file flash;
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FILINFO file_info;
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FIL file;
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}file_struct_private;
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// 定义内存文件
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typedef struct
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{
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uint8_t data[MEM_FILE_SIZE];
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int size;
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int ptr;
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}libc_mem_file;
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// 定义文件结构体
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struct __FILE
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{
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int type;
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file_struct_private *ptr;
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const libc_device_file *dev;
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libc_mem_file *mem;
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};
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// 寻找指定名称的设备
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extern const unsigned int Load$$libc_dev$$Base;
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extern const unsigned int Load$$libc_dev$$Limit;
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const libc_device_file *libc_find_dev(const char *name)
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{
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libc_device_file *start=(libc_device_file *)&Load$$libc_dev$$Base;
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libc_device_file *end=(libc_device_file *)&Load$$libc_dev$$Limit;
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libc_device_file *ptr=0;
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for(ptr=start;ptr<end;ptr++)
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{
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if(strcmp(ptr->name,name)==0)
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return ptr;
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}
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return NULL;
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}
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// 基本输入输出流
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FILE __stdin={
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.type=FILE_TYPE_DEVICE,
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.dev=0,
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};
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FILE __stdout={
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.type=FILE_TYPE_DEVICE,
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.dev=0,
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};
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FILE __stderr={
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.type=FILE_TYPE_DEVICE,
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.dev=0,
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};
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static int libc_init(void)
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{
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freopen("usart","r+",stdin);
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freopen("usart","r+",stdout);
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freopen("usart","r+",stderr);
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return 0;
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}
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extern_init(libc,libc_init);
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// 删除文件，返回0成功
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int remove(const char * filename)
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{
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if (f_unlink(filename)==FR_OK)
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return 0;
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else
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return -1;
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}
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//重命名，返回0成功
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int rename(const char * old_, const char * new_)
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{
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if (f_rename (old_,new_)==FR_OK)
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return 0;
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else
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return -1;
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}
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// 在指定流上创建临时文件
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static FILE *tmpfile_s(FILE * stream)
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{
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FILE *file=stream;
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if(file==NULL) file=calloc (1,sizeof (FILE));
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file->type=FILE_TYPE_MEM;
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file->mem=calloc(1,sizeof(libc_mem_file));
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file->mem->size=MEM_FILE_SIZE;
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return file;
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}
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// 创建临时文件，在文件关闭时自动删除
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FILE *tmpfile(void)
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{
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return tmpfile_s(NULL);
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}
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// 返回一个和现有文件名不同的字符串，这里始终返回 NULL
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char *tmpnam(char * s)
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{
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return NULL;
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}
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// 关闭文件，返回0成功
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int fclose(FILE * stream)
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{
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FILE * file=stream;
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if (file)
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{
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if(file->ptr)
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{
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if (file->ptr->flash.size==0)
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f_close(&file->ptr->file);
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free(file->ptr);
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file->ptr=NULL;
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}
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if(file->mem)
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{
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free(file->mem);
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file->mem=NULL;
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}
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if(file->dev)
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{
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if(file->dev->close)
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file->dev->close();
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file->dev=NULL;
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}
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if((file!=stdin)&&(file!=stdout)&&(file!=stderr))
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{
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// 基本输入输出流使用的是静态内存
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free(file);
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}
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else
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{
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// 设置为初始流设备
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// freopen("uart5","r+",file);
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}
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return 0;
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}
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return -1;
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}
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// 刷新，返回0成功
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int fflush(FILE * stream)
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{
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return 0;
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}
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int ferror(FILE * stream)
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{
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return 0;
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}
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// 由字符得到打开类型
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static BYTE f_get_mode(const char *mode)
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{
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typedef struct{
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const char *mode;
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BYTE mb;
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}m_item;
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m_item items[]={
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{"r",FA_READ},//open text file for reading
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{"w",FA_WRITE},//create text file for writing, or truncate to zero length
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{"a",FA_OPEN_ALWAYS|FA_OPEN_APPEND|FA_WRITE},//append; open text file or create for writing at eof
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{"rb",FA_READ},//open binary file for reading
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{"wb",FA_WRITE},//create binary file for writing, or truncate to zero length
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{"ab",FA_OPEN_ALWAYS|FA_OPEN_APPEND|FA_WRITE},//append; open binary file or create for writing at eof
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{"r+",FA_READ|FA_WRITE},//open text file for update (reading and writing)
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{"w+",FA_CREATE_NEW|FA_READ|FA_WRITE},//create text file for update, or truncate to zero length
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{"a+",FA_OPEN_ALWAYS|FA_OPEN_APPEND|FA_READ|FA_WRITE},//append; open text file or create for update, writing at eof
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{"rb+",FA_READ|FA_WRITE},//open binary file for update (reading and writing)
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{"wb+",FA_CREATE_NEW|FA_READ|FA_WRITE},//create binary file for update, or truncate to zero length
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{"ab+",FA_OPEN_ALWAYS|FA_OPEN_APPEND|FA_READ|FA_WRITE},//append; open binary file or create for update, writing at eof
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{NULL,NULL},
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};
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for(int i=0;items[i].mode;i++)
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{
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if(strcmp(items[i].mode,mode)==0)
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return items[i].mb;
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}
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return FA_READ;
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}
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// 在指定流上打开文件
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static FILE *fopen_s(const char * filename,const char * mode,FILE *stream)
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{
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FILE *file=stream;
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if(file==NULL)
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file=calloc (1,sizeof(FILE));
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file_struct_private *file_p=NULL;
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u8 ret=0;
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// 首先查找同名设备
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file->type=FILE_TYPE_DEVICE;
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file->dev=libc_find_dev(filename);
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if(file->dev!=NULL)
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{
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if(file->dev->open) file->dev->open();
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return file;
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}
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file->type=FILE_TYPE_FILE;
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if (filename[0]=='0'&&filename[1]==':')
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{
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file_p=calloc (1,sizeof (file_struct_private));
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ret=f_stat (filename,&file_p->file_info);
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if (ret==FR_OK)
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{
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f_open(&file_p->file,filename,f_get_mode(mode));
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file->ptr=file_p;
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}
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else
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{
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free(file_p);
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file_p=NULL;
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free(file);
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file=NULL;
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}
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}
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else
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{
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file_p=calloc (1,sizeof (file_struct_private));
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if (file_p->flash.addr= FLASH_FindFile((char *)filename,&file_p->flash.size),file_p->flash.addr==0)
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{
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free(file_p);
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file_p=NULL;
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free(file);
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file=NULL;
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}
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else
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{
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file->ptr=file_p;
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}
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}
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return (FILE *)file;
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}
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// 打开文件
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FILE *fopen(const char * filename,const char * mode)
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{
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return fopen_s(filename,mode,NULL);
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}
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// 把新的文件名和流关联，输出新的流
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// 如果filename==NULL，则创建一个内存文件
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FILE *freopen(const char * filename, const char * mode, FILE * stream)
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{
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FILE * file=stream;
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if(file==NULL) return NULL;
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// 在本例中只允许修改基本输入输出流
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if((file!=stdin)&&(file!=stdout)&&(file!=stderr)) return NULL;
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// 首先尝试关闭与流关联的文件
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fclose(stream);
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// 把新文件关联到流
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if(filename!=NULL)
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return fopen_s(filename,mode,stream);
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else
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return tmpfile_s(stream);
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}
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// 设置缓冲区，返回0成功
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int setvbuf(FILE * stream, char * buf, int mode, size_t size)
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{
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return 0;
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}
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void setbuf(FILE * stream,char * buf)
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{
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if(buf)
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setvbuf(stream,buf,_IOFBF,BUFSIZ);
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else
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setvbuf(stream,buf,_IONBF,BUFSIZ);
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}
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// 设备文件获取一个字符
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static int fgetc_dev(FILE * stream)
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{
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int c=EOF;
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const libc_device_file *dev=stream->dev;
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if(dev)
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{
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if(dev->putc)
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{
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c=dev->getc();
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return c;
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}
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}
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return c;
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}
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// 内存文件获取一个字符
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static int fgetc_mem(FILE * stream)
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{
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int c=EOF;
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libc_mem_file *mem=stream->mem;
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if(mem)
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{
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if(mem->ptr<mem->size)
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{
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c=mem->data[mem->ptr];
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mem->ptr++;
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return c;
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}
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}
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return c;
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}
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// 普通文件获取一个字符
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static int fgetc_fil(FILE * stream)
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{
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int c=EOF;
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uint8_t d;
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if(fread(&d, 1, 1, stream)==1)
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c=d;
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return c;
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}
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static int (*const g_getc_funs[3])(FILE *)={
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fgetc_fil,
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fgetc_dev,
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fgetc_mem,
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};
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// 获取文件流中的一个字符
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int fgetc(FILE * stream)
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{
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int c=EOF;
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if(stream)
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{
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c=g_getc_funs[stream->type](stream);
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}
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return c;
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}
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// 设备文件写入一个字符
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static int fputc_dev(int c,FILE * stream)
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{
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const libc_device_file *dev=stream->dev;
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if(dev)
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{
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if(dev->putc)
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{
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dev->putc(c);
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return c;
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}
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}
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return EOF;
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}
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// 内存文件写入一个字符
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static int fputc_mem(int c,FILE * stream)
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{
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libc_mem_file *mem=stream->mem;
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if(mem)
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{
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if(mem->ptr<mem->size)
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{
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mem->data[mem->ptr]=c;
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mem->ptr++;
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return c;
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}
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}
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return EOF;
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}
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// 普通文件写入一个字符
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static int fputc_fil(int c,FILE * stream)
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{
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uint8_t d=c;
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if(fwrite(&d, 1, 1, stream)==1)
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return c;
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else
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return EOF;
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}
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static int (*const g_putc_funs[3])(int,FILE *)={
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fputc_fil,
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fputc_dev,
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fputc_mem,
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};
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// 写入一个字符
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int fputc(int c, FILE * stream)
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{
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if(stream)
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{
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return g_putc_funs[stream->type](c,stream);
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}
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return EOF;
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}
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// 普通文件读取
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static size_t fread_fil(void * ptr, size_t size, size_t nmemb, FILE * stream)
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{
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file_struct_private * file=stream->ptr;
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if (file)
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{
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if (file->flash.size==0)
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{
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UINT rb=0;
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f_read (&file->file,ptr,size*nmemb,&rb);
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return rb/size;
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}
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else
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{
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u32 read_size=size*nmemb;
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if (read_size>file->flash.size-file->flash.ptr)
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read_size=file->flash.size-file->flash.ptr;
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FLASH_ReadData(ptr,file->flash.ptr+file->flash.addr,size*nmemb);
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file->flash.ptr+=read_size;
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return read_size/size;
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}
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}
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return 0;
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}
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// 设备文件读取
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static size_t fread_dev(void * ptr, size_t size, size_t nmemb, FILE * stream)
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{
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const libc_device_file *dev=stream->dev;
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if(dev)
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{
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// 暂时不支持设备文件读取
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}
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return 0;
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}
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// 内存文件读取
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static size_t fread_mem(void * ptr, size_t size, size_t nmemb, FILE * stream)
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{
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libc_mem_file *mem=stream->mem;
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if(mem)
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{
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// 暂时不支持内存文件读取
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}
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return 0;
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}
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static size_t (*const g_read_funs[3])(void *,size_t,size_t,FILE *)={
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fread_fil,
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fread_dev,
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fread_mem,
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};
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// 读取文件
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size_t fread(void * ptr, size_t size, size_t nmemb, FILE * stream)
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{
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if(stream)
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{
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return g_read_funs[stream->type](ptr,size,nmemb,stream);
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}
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return 0;
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}
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// 设备文件写入
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static size_t fwrite_dev(const void * ptr, size_t size, size_t nmemb, FILE * stream)
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{
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const libc_device_file *dev=stream->dev;
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if(dev)
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{
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if(dev->write)
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{
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return dev->write(ptr,size*nmemb)/size;
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}
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}
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return 0;
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}
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// 内存文件写入
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static size_t fwrite_mem(const void * ptr, size_t size, size_t nmemb, FILE * stream)
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{
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libc_mem_file *mem=stream->mem;
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if(mem)
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{
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// 暂时不支持内存文件写入
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}
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return 0;
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}
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// 普通文件写入
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static size_t fwrite_fil(const void * ptr, size_t size, size_t nmemb, FILE * stream)
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{
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file_struct_private * file=stream->ptr;
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if (file)
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{
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if (file->flash.size==0)
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{
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UINT rb=0;
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f_write(&file->file,ptr,size*nmemb,&rb);
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return nmemb;
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}
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else
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{
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//flash暂时不支持写入
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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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|
||
static size_t (*const g_write_funs[3])(const void *,size_t,size_t,FILE *)={
|
||
fwrite_fil,
|
||
fwrite_dev,
|
||
fwrite_mem,
|
||
};
|
||
|
||
|
||
// 写入文件
|
||
size_t fwrite(const void * ptr, size_t size, size_t nmemb, FILE * stream)
|
||
{
|
||
if(stream)
|
||
{
|
||
return g_write_funs[stream->type](ptr,size,nmemb,stream);
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
|
||
// 获取文件位置，成功返回0
|
||
int fgetpos(FILE * stream, fpos_t *pos)
|
||
{
|
||
return 1;
|
||
}
|
||
|
||
// 设置文件位置，成功返回0
|
||
int fsetpos(FILE * stream, const fpos_t * pos)
|
||
{
|
||
return 1;
|
||
}
|
||
|
||
|
||
|
||
|
||
|
||
|
||
// 普通文件设置文件偏移，成功返回0
|
||
static int fseek_fil(FILE * stream, long int offset, int whence)
|
||
{
|
||
file_struct_private * file=stream->ptr;
|
||
if (file)
|
||
{
|
||
if (file->flash.size==0)
|
||
{
|
||
//文件开头
|
||
if (SEEK_SET==whence)
|
||
{
|
||
if (f_lseek(&file->file,offset)==FR_OK)
|
||
return 0;
|
||
}
|
||
else if (SEEK_END==whence)
|
||
{
|
||
//这时offset为负数
|
||
offset=file->file_info.fsize+offset;
|
||
if (f_lseek(&file->file,offset)==FR_OK)
|
||
return 0;
|
||
}
|
||
else if (SEEK_CUR==whence)
|
||
{
|
||
//这时offset可正可负
|
||
long int pos=f_tell(&file->file);
|
||
offset=pos+offset;
|
||
if (f_lseek(&file->file,offset)==FR_OK)
|
||
return 0;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
//文件开头
|
||
if (SEEK_SET==whence)
|
||
{
|
||
if(offset>=0&&offset<=file->flash.size)
|
||
{
|
||
file->flash.ptr=offset;
|
||
return 0;
|
||
}
|
||
}
|
||
else if (SEEK_END==whence)
|
||
{
|
||
offset=file->flash.size+offset;
|
||
if(offset>=0&&offset<=file->flash.size)
|
||
{
|
||
file->flash.ptr=offset;
|
||
return 0;
|
||
}
|
||
}
|
||
else if (SEEK_CUR==whence)
|
||
{
|
||
//这时offset可正可负
|
||
long int pos=file->flash.ptr;
|
||
offset=pos+offset;
|
||
if(offset>=0&&offset<=file->flash.size)
|
||
{
|
||
file->flash.ptr=offset;
|
||
return 0;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
return -1;
|
||
}
|
||
|
||
// 设备文件设置文件偏移，成功返回0
|
||
static int fseek_dev(FILE * stream, long int offset, int whence)
|
||
{
|
||
const libc_device_file *dev=stream->dev;
|
||
|
||
if(dev)
|
||
{
|
||
}
|
||
|
||
return -1;
|
||
}
|
||
|
||
// 内存文件设置文件偏移，成功返回0
|
||
static int fseek_mem(FILE * stream, long int offset, int whence)
|
||
{
|
||
libc_mem_file *mem=stream->mem;
|
||
|
||
if(mem)
|
||
{
|
||
//文件开头
|
||
if (SEEK_SET==whence)
|
||
{
|
||
if(offset>=0&&offset<=mem->size)
|
||
{
|
||
mem->ptr=offset;
|
||
return 0;
|
||
}
|
||
}
|
||
else if (SEEK_END==whence)
|
||
{
|
||
offset=mem->size+offset;
|
||
if(offset>=0&&offset<=mem->size)
|
||
{
|
||
mem->ptr=offset;
|
||
return 0;
|
||
}
|
||
}
|
||
else if (SEEK_CUR==whence)
|
||
{
|
||
//这时offset可正可负
|
||
long int pos=mem->ptr;
|
||
offset=pos+offset;
|
||
if(offset>=0&&offset<=mem->size)
|
||
{
|
||
mem->ptr=offset;
|
||
return 0;
|
||
}
|
||
}
|
||
}
|
||
|
||
return -1;
|
||
}
|
||
|
||
static int (*const g_seek_funs[3])(FILE *,long int,int)={
|
||
fseek_fil,
|
||
fseek_dev,
|
||
fseek_mem,
|
||
};
|
||
|
||
// 设置文件偏移，成功返回0
|
||
int fseek(FILE * stream, long int offset, int whence)
|
||
{
|
||
if(stream)
|
||
{
|
||
return g_seek_funs[stream->type](stream,offset,whence);
|
||
}
|
||
return -1;
|
||
}
|
||
|
||
|
||
// 返回文件指针偏移
|
||
static long int ftell_fil(FILE * stream)
|
||
{
|
||
file_struct_private * file=stream->ptr;
|
||
if (file)
|
||
{
|
||
if (file->flash.size==0)
|
||
{
|
||
return f_tell(&file->file);
|
||
}
|
||
else
|
||
{
|
||
return file->flash.ptr;
|
||
}
|
||
}
|
||
return -1;
|
||
}
|
||
|
||
// 返回文件指针偏移
|
||
static long int ftell_dev(FILE * stream)
|
||
{
|
||
const libc_device_file *dev=stream->dev;
|
||
|
||
return 0;
|
||
}
|
||
|
||
// 返回文件指针偏移
|
||
static long int ftell_mem(FILE * stream)
|
||
{
|
||
libc_mem_file *mem=stream->mem;
|
||
if(mem)
|
||
return mem->ptr;
|
||
else
|
||
return 0;
|
||
}
|
||
|
||
static long int (*const g_tell_funs[3])(FILE *)={
|
||
ftell_fil,
|
||
ftell_dev,
|
||
ftell_mem,
|
||
};
|
||
|
||
|
||
// 返回文件指针偏移
|
||
long int ftell(FILE * stream)
|
||
{
|
||
if(stream)
|
||
{
|
||
return g_tell_funs[stream->type](stream);
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
|
||
// 把文件指针设置为文件开头
|
||
void rewind(FILE * stream)
|
||
{
|
||
fseek(stream, 0L, SEEK_SET);
|
||
}
|
||
|
||
|
||
// 测试文件结束，未结束返回0，已结束返回1
|
||
static int feof_fil(FILE * stream)
|
||
{
|
||
file_struct_private * file=stream->ptr;
|
||
if(file)
|
||
{
|
||
if (file->flash.size==0)
|
||
{
|
||
FIL *fp=&file->file;
|
||
return f_eof(fp);
|
||
}
|
||
else
|
||
{
|
||
return (int)(file->flash.ptr==file->flash.size);
|
||
}
|
||
}
|
||
return 1;
|
||
}
|
||
// 测试文件结束，未结束返回0，已结束返回1
|
||
static int feof_dev(FILE * stream)
|
||
{
|
||
const libc_device_file *dev=stream->dev;
|
||
|
||
if(dev)
|
||
return 0;
|
||
else
|
||
return 1;
|
||
}
|
||
|
||
static int feof_mem(FILE * stream)
|
||
{
|
||
libc_mem_file *mem=stream->mem;
|
||
|
||
if(mem)
|
||
return (int)(mem->ptr==mem->size);
|
||
else
|
||
return 1;
|
||
}
|
||
|
||
static int (*const g_eof_funs[3])(FILE *)={
|
||
feof_fil,
|
||
feof_dev,
|
||
feof_mem,
|
||
};
|
||
|
||
|
||
// 测试文件结束，未结束返回0，已结束返回1
|
||
int feof(FILE * stream)
|
||
{
|
||
if(stream)
|
||
{
|
||
return g_eof_funs[stream->type](stream);
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
// 断言，c语言标准库使用这个函数
|
||
void __aeabi_assert(const char * e, const char *_file_, int _line_)
|
||
{
|
||
printf("%s:%s,at %d\r\n",e,_file_,_line_);
|
||
while(1);
|
||
}
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|