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-
- Standard C library for the SLOF firmware project
- ================================================
-
-To use this library, link your target against the "libc.a" archive.
-
-However, there are some prerequisites before you can use certain parts of the
-library:
-
-1) If you want to use malloc() and the like, you have to supply an implemen-
- tation of sbrk() in your own code. malloc() uses sbrk() to get new, free
- memory regions.
-
- Prototype: void *sbrk(int incr);
- Description: sbrk() increments the available data space by incr bytes and
- returns a pointer to the start of the new area.
-
- See the man-page of sbrk for details about this function.
-
-2) Before you can use the stdio output functions like printf(), puts() and the
- like, you have to provide a standard write() function in your code.
- printf() and the like use write() to print out the strings to the standard
- output.
-
- Prototype: ssize_t write(int fd, const void *buf, size_t cnt);
- Description: Write cnt byte from the buffer buf to the stream associated
- with the file descriptor fd.
-
- The stdio functions will print their output to the stdout channel which is
- assigned with the file descriptor 1 by default. Note that the stdio
- functions will not use open() before calling write(), so if the stdout
- cannel needs to be opened first, you should do that in your start-up code
- before using the libc functions for the first time.
-
-3) Before you can use the stdio input functions like scanf() and the
- like, you have to provide a standard read() function in your code.
- scanf() and the like use read() to get the characters from the standard
- input.
-
- Prototype: ssize_t read(int fd, void *buf, size_t cnt);
- Description: Read cnt byte from the stream associated with the file
- descriptor fd and put them into the buffer buf.
-
- The stdio functions will get their input from the stdin channel which is
- assigned with the file descriptor 0 by default. Note that the stdio
- functions will not use open() before calling read(), so if the stdin
- cannel needs to be opened first, you should do that in your start-up code
- before using the libc functions for the first time.
-