SeaChell
C Shell
#THINGS TO WORK ON
- (DONE - NEEDS TESTING) * make non space special chars work (a|b>d)
- (DONE - NEEDS TESTING) * &
- (DONE) * implement config file
- (DONE - NEEDS TESTING) * do combinations work like a real shell (cmd < a > b | c > d <....)
- (DONE - NEEDS TESTING) * make multiple redirects work (i.e. cmd < filein > fileout 2> fileerr)
- (PROBABLY IMPOSSIBLE) * Tab completion
- (PROBABLY IMPOSSIBLE) * up and down for recent commands run
- (DONE) * |
- (DONE) * >
- (DONE) * <
- (DONE) * >>
- (DONE) * cd
- (DONE) * exit
- (DONE) * replace home dir with ~
- (DONE) * figure out tab situation
#IMPLEMENTS
- |
-
- <
-
- cd to home
cd home - cd to path directories
- exit
- config file
- &
- make non space special chars work (a|b>d)
- make multiple redirects work (i.e. cmd < filein > fileout 2> fileerr)
- do combinations work like a real shell (cmd < a > b | c > d <....)
#BUGS
- permission errors: Not having write permissions and trying to write out will segfault, attempts to fix this using eaccess/access block permissions to multiple writable places
#FILE AND FUNCTION HEADERS
chell.c: handles everything
/*======== static void cp_pipe() =========================================================
Inputs: none
Returns: nothing
Description: forks for chell to run
========================================================================================*/
/*======== static void sig_childactive(int sig) ==========================================
Inputs: int sig
Returns: none
Description: signal handler for SIGINT when a child is active
========================================================================================*/
/*======== static void sig_nochild(int sig) ==============================================
Inputs: int sig
Returns: none
Description: signal handler for SIGINT and SIGTERM when the child is not active
========================================================================================*/
/*======== void exit_custom() ============================================================
Inputs: none
Returns: none
Description: exits chell
========================================================================================*/
/*======== void prompt() =================================================================
Inputs: none
Returns: none
Description: displays chell prompt with user info and current path
========================================================================================*/
/*======== void chell(char *words) =======================================================
Inputs: char *words
Returns: none
Description: wrapper function for chellFd
========================================================================================*/
/*======== void chellFd(char *cmd, int infd, int outfd, int errfd) =======================
Inputs: char *cmd, int infd, int outfd, int errfd
Returns: none
Description: takes cmd and input, output, and errror and parses the cmd and sends
to command(char **words, int infd, int outfd, int errfd, int shouldiwait)
========================================================================================*/
/*======== int command(char **words, int infd, int outfd, int errfd, int shouldiwait) ====
Inputs: char *words
Returns: none
Description: runs words array of command with proper input, output, and error
handeling
========================================================================================*/
/*======== void execline(char *line, char *cmd) ==========================================
Inputs: char *line, char *cmd
Returns: none
Description: parses input by semicolons and runs the individual commands
========================================================================================*/
/*======== char *readall(char *path) =====================================================
Inputs: char *path
Returns: none
Description: reads file
========================================================================================*/
/*======== char **splitread(char **full) =================================================
Inputs: char **full
Returns: none
Description: splits full into lines
========================================================================================*/
/*======== char* linerepls(char *line) ===================================================
Inputs: char *line
Returns: none
Description: replaces certain things in a line
current replacements:
~: getenv("HOME")
> >> < 2> 2>> &> &>> |: add spaces around em
========================================================================================*/
/*======== int main() ====================================================================
Inputs: char none
Returns: none
Description: main function that is run when the executable file is run
========================================================================================*/
#Authors Shantanu Jha Gabriel Marks Charles Zhang
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