sudokara / aabtltmtsh Goto Github PK

AABTLTMTSH:Ambitious aspirations but too little time makes this shell hacky

To compile : make
To remove object files : make clean

To run : ./shell

.
├── README.md
├── bg.c
├── bg.h
├── cd.c
├── cd.h
├── discover.c
├── discover.h
├── echo.c
├── echo.h
├── fg.c
├── fg.h
├── headers.h
├── history.c
├── history.h
├── listDir.c
├── listDir.h
├── main.c
├── makefile
├── pinfo.c
├── pinfo.h
├── prompt.c
├── prompt.h
├── pwd.c
├── pwd.h
└── variables.h

bg.c and bg.h
Implements the functions needed to make a background process and store its pid in a linked list. It also implements the function that given a pid of a background process that has exited prints its return code and removes it from the list.

cd.c and cd.h
Implements the cd function. Supports absolute and relative paths along with ., .., ~, - and null. getAbsPath converts a path of the form ~/ to an absolute path that can be used to change directory using chdir. changeDirect calls chdir and changeDirectoryUpdatePrefix changes the directory and modifies the prefix(prompt) to the appropriate directory.

discover.c and discover.h
Contains the function that parses input and the two functions that searches for a file and one that prints all files and directories. It does not consider . and .. and prints the directories and files if they exist.

echo.c and echo.h
Implements the echo function. Quotes, escape sequences and multiline strings are not supported. Multiple spaces and tabs are truncated to a single space.

fg.c and fg.h
Has function to create and execute a foreground process and return the time it has executed for. The time calculated is the time taken by the last executed foreground process.

history.c and history.h
Contains the functions required to store command history. The entire line is stored in history, except if it is exactly the same as the previous command. It is first stored locally in a circular array and then on exiting the shell it is stored in a file for future reference. On startup of the shell, the history file is attempted to be read and the stored history is loaded onto the program.

listDir.c and listDir.h
Contains functions that implements the ls and ls -l commands and a function that parses the flag for -l and calls the appropriate function.

main.c
Contains setting up of global variables, first call to print prompt, processes string inputs and calls appropriate functions based on input.

headers.h
Contains the #pragma once directive to prevent multiple includes. Includes local headers and system library headers. Defines PATH_MAX, the longest path length to 4096 if undefined(usually in sys/limits.h).
Includes the system libraries and local headers needed.

pinfo.c and pinfo.h
Contains functions to print the pinfo for the current process and for a process with a given pid. Reads the /proc/pid/stat file.

variables.h
Contains global variables and definitions for terminal colours RED, GREEN, BLUE and RESET.

prompt.c and prompt.h
The names prefix and prompt are used interchangeably. getPrefix updates appropriate part of the prefix according to the parameter passed. See prompt.h for more details.

pwd.c and pwd.h
Implements the pwd function. getCurrentDirectory returns a malloced string while printWorkingDirectory automatically allocates, prints and frees.

makefile
make to build executable, make clean to remove object files.