pdlibc (Public Domain Libc) is a example implementation of the standard C library designed to be as simple as posible.
It currently provides most of the subset of functions from C89 and the linux kernels nolibc
The functions that have had full tests for them (make test):
- abort()
- assert()
- atexit(), exit()
- atoi(), atol(), strtod()
- bsearch()
- calloc()
- cos()
- fabs()
- fopen()
- free()
- fwrite()
- getenv()
- atan() and atan2()
- setlocale(), localeconv()
- rand(), srand()
- IO buffering (setvbuf, fflush)
- labs(), abs()
- malloc()
- memcpy()
- memmove()
- memset()
- putchar()
- puts()
- qsort()
- raise()
- sin()
- Most of printf(), vfprintf(), vprintf(), and fprintf();
- sqrt()
- strcat()
- strchr(), memchr()
- strcmp(), strncmp()
- strcpy(), strncpy(), memcpy()
- strerror()
- strlen()
- The entirity of ctype.h
- The entirity of varargs.h