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POSIX API
fs_fopen() Mode String
“r” or “rb”
“w” or “wb”
“a” or “ab”
“r+” or “rb+” or “r+b”
“w+” or “wb+” or “w+b”
“a+” or “ab+” or “a+b”
Read?
Yes
No
No
Yes
Yes
Yes
Write?
No
Yes
Yes
Yes
Yes
Yes
Truncate?
No
Yes
No
No
Yes
No
Create?
No
Yes
Yes
No
Yes
Yes
Append?
No
No
Yes
No
No
Yes
Table 6-2 fs_fopen() mode strings interpretations.
After a file is opened, any of the file access functions valid for that its mode can be called.
The most commonly used functions are fs_fread() and fs_fwrite() , which read or write
a certain number of ‘items’ from a file:
number of items read -->
cnt = fs_fread(p_buf,
1,
100,
p_file);
<--
<--
<--
<--
pointer to buffer
size of each item
number of items
pointer to file
The return value, the number of items read (or written), should be less than or equal to the
third argument. If the operation is a read, this value may be less than the third argument for
one of two reasons. First, the file could have encountered the end-of-file (EOF), which
means that there is no more data in the file. Second, the device could have been removed,
or some other error could have prevented the operation. To diagnose the cause, the
fs_feof() function should be used. This function returns a non-zero value if the file has
encountered the EOF.
Once the file access is complete, the file must be closed; if an application fails to close files,
then the file system suite resources such as file objects may be depleted.
An example of reading a file is given in Listing 6-1.
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