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Add support for finding file position, or positionning from and of file, as this is available in other OSes

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This commit is contained in:
Vincent Barrilliot 2021-11-12 12:23:55 +00:00
parent 1990e0761d
commit 47478a73af
2 changed files with 17 additions and 10 deletions
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1
src/dev/channel.h
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@ -38,6 +38,7 @@
#define CDEV_SEEK_ABSOLUTE 0
#define CDEV_SEEK_RELATIVE 1
#define CDEV_SEEK_END 2
/*
* Structure defining a channel

26
src/dev/fsys.c
View file

@ -544,23 +544,29 @@ short fchan_flush(t_channel * chan) {
}
/**
* attempt to move the "cursor" position in the channel
* Attempt to move the "cursor" position in the channel
*/
short fchan_seek(t_channel * chan, long position, short base) {
FIL * file;
FRESULT result;
int total_written;
FSIZE_t new_position;
file = fchan_to_file(chan);
if (file) {
if (base == CDEV_SEEK_ABSOLUTE) {
result = f_lseek(file, position);
return fatfs_to_foenix(result);
} else if (base == CDEV_SEEK_RELATIVE) {
long current = f_tell(file);
result = f_lseek(file, current + position);
return fatfs_to_foenix(result);
switch (base) {
case CDEV_SEEK_ABSOLUTE:
new_position = position;
break;
case CDEV_SEEK_RELATIVE:
new_position = f_tell(file) + position;
break;
case CDEV_SEEK_END:
new_position = f_size(file) - position;
break;
default:
return ERR_GENERAL;
}
return fatfs_to_foenix(f_lseek(file, position));
}
return ERR_BADCHANNEL;