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proj2_submission.ps
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%!PS-Adobe-3.0
%%Title: alias.c, builtins.c, get_path.c, ipc.c, kgsh.c, redirection.c, util.c, watchmail.c, wildcard.c, alias.h
%%For: Kevin Graney
%%Creator: a2ps version 4.13
%%CreationDate: Sun Nov 1 19:31:00 2009
%%BoundingBox: 24 24 588 768
%%DocumentData: Clean7Bit
%%Orientation: Landscape
%%Pages: 30
%%PageOrder: Ascend
%%DocumentMedia: Letter 612 792 0 () ()
%%DocumentNeededResources: font Courier
%%+ font Courier-Bold
%%+ font Courier-BoldOblique
%%+ font Courier-Oblique
%%+ font Helvetica
%%+ font Helvetica-Bold
%%+ font Symbol
%%+ font Times-Bold
%%+ font Times-Roman
%%DocumentProcessColors: Black
%%DocumentSuppliedResources: procset a2ps-a2ps-hdr
%%+ procset a2ps-black+white-Prolog
%%+ encoding ISO-8859-1Encoding
%%EndComments
/a2psdict 200 dict def
a2psdict begin
%%BeginProlog
%%Copyright: (c) 1988, 89, 90, 91, 92, 93 Miguel Santana
%%Copyright: (c) 1995, 96, 97, 98 Akim Demaille, Miguel Santana
% Check PostScript language level.
/languagelevel where {
pop /gs_languagelevel languagelevel def
} {
/gs_languagelevel 1 def
} ifelse
% EPSF import as in the Red Book
/BeginInclude {
/b4_Inc_state save def % Save state for cleanup
/dict_count countdictstack def % Count objects on dict stack
/op_count count 1 sub def % Count objects on operand stack
userdict begin
0 setgray 0 setlinecap
1 setlinewidth 0 setlinejoin
10 setmiterlimit [ ] 0 setdash newpath
gs_languagelevel 1 ne {
false setstrokeadjust false setoverprint
} if
} bind def
/EndInclude {
count op_count sub { pos } repeat % Clean up stacks
countdictstack dict_count sub { end } repeat
b4_Inc_state restore
} bind def
/BeginEPSF {
BeginInclude
/showpage { } def
} bind def
/EndEPSF {
EndInclude
} bind def
% Page prefeed
/page_prefeed { % bool -> -
statusdict /prefeed known {
statusdict exch /prefeed exch put
} {
pop
} ifelse
} bind def
/deffont {
findfont exch scalefont def
} bind def
/reencode_font {
findfont reencode 2 copy definefont pop def
} bind def
% Function c-show (str => -)
% centers text only according to x axis.
/c-show {
dup stringwidth pop
2 div neg 0 rmoveto
show
} bind def
% Function l-show (str => -)
% prints texts so that it ends at currentpoint
/l-show {
dup stringwidth pop neg
0
rmoveto show
} bind def
% center-fit show (str w => -)
% show centered, and scale currentfont so that the width is less than w
/cfshow {
exch dup stringwidth pop
% If the title is too big, try to make it smaller
3 2 roll 2 copy
gt
{ % if, i.e. too big
exch div
currentfont exch scalefont setfont
} { % ifelse
pop pop
}
ifelse
c-show % center title
} bind def
% Return the y size of the current font
% - => fontsize
/currentfontsize {
currentfont /FontMatrix get 3 get 1000 mul
} bind def
% reencode the font
% <encoding-vector> <fontdict> -> <newfontdict>
/reencode { %def
dup length 5 add dict begin
{ %forall
1 index /FID ne
{ def }{ pop pop } ifelse
} forall
/Encoding exch def
% Use the font's bounding box to determine the ascent, descent,
% and overall height; don't forget that these values have to be
% transformed using the font's matrix.
% We use `load' because sometimes BBox is executable, sometimes not.
% Since we need 4 numbers an not an array avoid BBox from being executed
/FontBBox load aload pop
FontMatrix transform /Ascent exch def pop
FontMatrix transform /Descent exch def pop
/FontHeight Ascent Descent sub def
% Define these in case they're not in the FontInfo (also, here
% they're easier to get to.
/UnderlinePosition 1 def
/UnderlineThickness 1 def
% Get the underline position and thickness if they're defined.
currentdict /FontInfo known {
FontInfo
dup /UnderlinePosition known {
dup /UnderlinePosition get
0 exch FontMatrix transform exch pop
/UnderlinePosition exch def
} if
dup /UnderlineThickness known {
/UnderlineThickness get
0 exch FontMatrix transform exch pop
/UnderlineThickness exch def
} if
} if
currentdict
end
} bind def
% Function print line number (<string> # -)
/# {
gsave
sx cw mul neg 2 div 0 rmoveto
f# setfont
c-show
grestore
} bind def
% -------- Some routines to enlight plain b/w printings ---------
% Underline
% width --
/dounderline {
currentpoint
gsave
moveto
0 currentfont /Descent get currentfontsize mul rmoveto
0 rlineto
stroke
grestore
} bind def
% Underline a string
% string --
/dounderlinestring {
stringwidth pop
dounderline
} bind def
/UL {
/ul exch store
} bind def
% Draw a box of WIDTH wrt current font
% width --
/dobox {
currentpoint
gsave
newpath
moveto
0 currentfont /Descent get currentfontsize mul rmoveto
dup 0 rlineto
0 currentfont /FontHeight get currentfontsize mul rlineto
neg 0 rlineto
closepath
stroke
grestore
} bind def
/BX {
/bx exch store
} bind def
% Box a string
% string --
/doboxstring {
stringwidth pop
dobox
} bind def
%
% ------------- Color routines ---------------
%
/FG /setrgbcolor load def
% Draw the background
% width --
/dobackground {
currentpoint
gsave
newpath
moveto
0 currentfont /Descent get currentfontsize mul rmoveto
dup 0 rlineto
0 currentfont /FontHeight get currentfontsize mul rlineto
neg 0 rlineto
closepath
bgcolor aload pop setrgbcolor
fill
grestore
} bind def
% Draw bg for a string
% string --
/dobackgroundstring {
stringwidth pop
dobackground
} bind def
/BG {
dup /bg exch store
{ mark 4 1 roll ] /bgcolor exch store } if
} bind def
/Show {
bg { dup dobackgroundstring } if
ul { dup dounderlinestring } if
bx { dup doboxstring } if
show
} bind def
% Function T(ab), jumps to the n-th tabulation in the current line
/T {
cw mul x0 add
bg { dup currentpoint pop sub dobackground } if
ul { dup currentpoint pop sub dounderline } if
bx { dup currentpoint pop sub dobox } if
y0 moveto
} bind def
% Function n: move to the next line
/n {
/y0 y0 bfs sub store
x0 y0 moveto
} bind def
% Function N: show and move to the next line
/N {
Show
/y0 y0 bfs sub store
x0 y0 moveto
} bind def
/S {
Show
} bind def
%%BeginResource: procset a2ps-a2ps-hdr 2.0 2
%%Copyright: (c) 1988, 89, 90, 91, 92, 93 Miguel Santana
%%Copyright: (c) 1995, 96, 97, 98 Akim Demaille, Miguel Santana
% Function title: prints page header.
% <ct> <rt> <lt> are passed as argument
/title {
% 1. Draw the background
x v get y v get moveto
gsave
0 th 2 div neg rmoveto
th setlinewidth
0.95 setgray
pw 0 rlineto stroke
grestore
% 2. Border it
gsave
0.7 setlinewidth
pw 0 rlineto
0 th neg rlineto
pw neg 0 rlineto
closepath stroke
grestore
% stk: ct rt lt
x v get y v get th sub 1 add moveto
%%IncludeResource: font Helvetica
fHelvetica fnfs 0.8 mul scalefont setfont
% 3. The left title
gsave
dup stringwidth pop fnfs 0.8 mul add exch % leave space took on stack
fnfs 0.8 mul hm rmoveto
show % left title
grestore
exch
% stk: ct ltw rt
% 4. the right title
gsave
dup stringwidth pop fnfs 0.8 mul add exch % leave space took on stack
dup
pw exch stringwidth pop fnfs 0.8 mul add sub
hm
rmoveto
show % right title
grestore
% stk: ct ltw rtw
% 5. the center title
gsave
pw 3 1 roll
% stk: ct pw ltw rtw
3 copy
% Move to the center of the left room
sub add 2 div hm rmoveto
% What is the available space in here?
add sub fnfs 0.8 mul sub fnfs 0.8 mul sub
% stk: ct space_left
%%IncludeResource: font Helvetica-Bold
fHelvetica-Bold fnfs scalefont setfont
cfshow
grestore
} bind def
% Function border: prints virtual page border
/border { %def
gsave % print four sides
0 setgray
x v get y v get moveto
0.7 setlinewidth % of the square
pw 0 rlineto
0 ph neg rlineto
pw neg 0 rlineto
closepath stroke
grestore
} bind def
% Function water: prints a water mark in background
/water { %def
gsave
scx scy moveto rotate
%%IncludeResource: font Times-Bold
fTimes-Bold 100 scalefont setfont
.97 setgray
dup stringwidth pop 2 div neg -50 rmoveto
show
grestore
} bind def
% Function rhead: prints the right header
/rhead { %def
lx ly moveto
fHelvetica fnfs 0.8 mul scalefont setfont
l-show
} bind def
% Function footer (cf rf lf -> -)
/footer {
fHelvetica fnfs 0.8 mul scalefont setfont
dx dy moveto
show
snx sny moveto
l-show
fnx fny moveto
c-show
} bind def
%%EndResource
%%BeginResource: procset a2ps-black+white-Prolog 2.0 1
% Function T(ab), jumps to the n-th tabulation in the current line
/T {
cw mul x0 add y0 moveto
} bind def
% Function n: move to the next line
/n { %def
/y0 y0 bfs sub store
x0 y0 moveto
} bind def
% Function N: show and move to the next line
/N {
Show
/y0 y0 bfs sub store
x0 y0 moveto
} bind def
/S {
Show
} bind def
/p {
false UL
false BX
fCourier bfs scalefont setfont
Show
} bind def
/sy {
false UL
false BX
fSymbol bfs scalefont setfont
Show
} bind def
/k {
false UL
false BX
fCourier-Oblique bfs scalefont setfont
Show
} bind def
/K {
false UL
false BX
fCourier-Bold bfs scalefont setfont
Show
} bind def
/c {
false UL
false BX
fCourier-Oblique bfs scalefont setfont
Show
} bind def
/C {
false UL
false BX
fCourier-BoldOblique bfs scalefont setfont
Show
} bind def
/l {
false UL
false BX
fHelvetica bfs scalefont setfont
Show
} bind def
/L {
false UL
false BX
fHelvetica-Bold bfs scalefont setfont
Show
} bind def
/str{
false UL
false BX
fTimes-Roman bfs scalefont setfont
Show
} bind def
/e{
false UL
true BX
fHelvetica-Bold bfs scalefont setfont
Show
} bind def
%%EndResource
%%EndProlog
%%BeginSetup
%%IncludeResource: font Courier
%%IncludeResource: font Courier-Oblique
%%IncludeResource: font Courier-Bold
%%IncludeResource: font Times-Roman
%%IncludeResource: font Symbol
%%IncludeResource: font Courier-BoldOblique
%%BeginResource: encoding ISO-8859-1Encoding
/ISO-8859-1Encoding [
/.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef
/.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef
/.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef
/.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef
/space /exclam /quotedbl /numbersign /dollar /percent /ampersand /quoteright
/parenleft /parenright /asterisk /plus /comma /minus /period /slash
/zero /one /two /three /four /five /six /seven
/eight /nine /colon /semicolon /less /equal /greater /question
/at /A /B /C /D /E /F /G
/H /I /J /K /L /M /N /O
/P /Q /R /S /T /U /V /W
/X /Y /Z /bracketleft /backslash /bracketright /asciicircum /underscore
/quoteleft /a /b /c /d /e /f /g
/h /i /j /k /l /m /n /o
/p /q /r /s /t /u /v /w
/x /y /z /braceleft /bar /braceright /asciitilde /.notdef
/.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef
/.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef
/.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef
/.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef
/space /exclamdown /cent /sterling /currency /yen /brokenbar /section
/dieresis /copyright /ordfeminine /guillemotleft /logicalnot /hyphen /registered /macron
/degree /plusminus /twosuperior /threesuperior /acute /mu /paragraph /bullet
/cedilla /onesuperior /ordmasculine /guillemotright /onequarter /onehalf /threequarters /questiondown
/Agrave /Aacute /Acircumflex /Atilde /Adieresis /Aring /AE /Ccedilla
/Egrave /Eacute /Ecircumflex /Edieresis /Igrave /Iacute /Icircumflex /Idieresis
/Eth /Ntilde /Ograve /Oacute /Ocircumflex /Otilde /Odieresis /multiply
/Oslash /Ugrave /Uacute /Ucircumflex /Udieresis /Yacute /Thorn /germandbls
/agrave /aacute /acircumflex /atilde /adieresis /aring /ae /ccedilla
/egrave /eacute /ecircumflex /edieresis /igrave /iacute /icircumflex /idieresis
/eth /ntilde /ograve /oacute /ocircumflex /otilde /odieresis /divide
/oslash /ugrave /uacute /ucircumflex /udieresis /yacute /thorn /ydieresis
] def
%%EndResource
% Initialize page description variables.
/sh 612 def
/sw 792 def
/llx 24 def
/urx 768 def
/ury 588 def
/lly 24 def
/#copies 1 def
/th 15.000000 def
/fnfs 11 def
/bfs 7.493857 def
/cw 4.496314 def
% Dictionary for ISO-8859-1 support
/iso1dict 8 dict begin
/fCourier ISO-8859-1Encoding /Courier reencode_font
/fCourier-Bold ISO-8859-1Encoding /Courier-Bold reencode_font
/fCourier-BoldOblique ISO-8859-1Encoding /Courier-BoldOblique reencode_font
/fCourier-Oblique ISO-8859-1Encoding /Courier-Oblique reencode_font
/fHelvetica ISO-8859-1Encoding /Helvetica reencode_font
/fHelvetica-Bold ISO-8859-1Encoding /Helvetica-Bold reencode_font
/fTimes-Bold ISO-8859-1Encoding /Times-Bold reencode_font
/fTimes-Roman ISO-8859-1Encoding /Times-Roman reencode_font
currentdict end def
/bgcolor [ 0 0 0 ] def
/bg false def
/ul false def
/bx false def
% The font for line numbering
/f# /Helvetica findfont bfs .6 mul scalefont def
/fSymbol /Symbol findfont def
/hm fnfs 0.25 mul def
/pw
cw 81.400000 mul
def
/ph
522.321860 th add
def
/pmw urx llx sub pw 2 mul sub 1 div def
/pmh 0 def
/v 0 def
/x [
0
dup pmw add pw add
] def
/y [
pmh ph add 0 mul ph add
dup
] def
/scx sw 2 div def
/scy sh 2 div def
/snx urx def
/sny lly 2 add def
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(/*) c n
( * CISC361: Operating Systems \(Fall 2009\)) N
( * Instructor: Ben Miller) N
( *) N
( * Project 2) N
( * Kevin Graney) N
( */) N
() p n
(/** ) c n
( * @file alias.c) N
( * @brief Definition of alias functions.) N
( * @author Kevin Graney) N
( * @version v0.1) N
( * @date 2009-08-02) N
( */) N
(#include) K
( ") p
(alias.h) str
(") p n
(#include) K
( ") p
(util.h) str
(") p n
() N
(/** ) c n
( * @brief Adds an alias to the alias list.) N
( *) N
( * Inserts an alias into the linked list structure that stores aliases) N
( * \(::aliasList\). A call to detokenize\(\) is made since aliases are stored as) N
( * unparsed commands. Any existing alias with the same name will be overwritten) N
( * when this function is called.) N
( * ) N
( * @param env A pointer to the global ::kgenv object.) N
( * @param name The name of the alias.) N
( * @param cmd_argc The argument count for the command the alias points to. ) N
( * @param cmd_argv[] The argument values for the command the alias points to.) N
( */) N
(void) k
( add_alias\(kgenv* env, ) p
(char) k
(* name, ) p
(int) k
( cmd_argc, ) p
(char) k
(* cmd_argv[]\){) p n
() N
( ) S
(// Allocate space for the new alias) c n
( aliasList* new_alias = malloc\() p
(sizeof) K
(\(aliasList\)\);) p n
( ) S
(if) K
(\(new_alias == ) p
(NULL) K
(\){) p n
() S 8 T (perror\(") S
(Failed to add alias) str
("\);) p n
() S 8 T () S
(return) K
(;) p n
( }) N
() N
( ) S
(// Delete any existing alias with the same name) c n
( remove_alias\(env, name\);) p n
() N
( ) S
(// Copy over the alias name) c n
( new_alias->name = \() p
(char) k
(*\)malloc\(strlen\(name\) + 1\);) p n
( ) S
(if) K
(\(new_alias->name == ) p
(NULL) K
(\){) p n
() S 8 T (perror\(") S
(Failed to add alias) str
("\);) p n
() S 8 T () S
(return) K
(;) p n
( }) N
( strcpy\(new_alias->name, name\);) N
() N
( ) S
(// Copy over the argv arrray and reconstruct the command line string so) c n
( ) p
(// the recursive calls work out correctly when processing the alias. We're) c n
( ) p
(// doing some unecessary processing using this method, but the) c n
( ) p
(// implementation is neater.) c n
( ) p
(int) k
( line_length = 0;) p n
( ) S
(for) K
(\() p
(int) k
( i=0; i < cmd_argc; i++\){) p n
( line_length += strlen\(cmd_argv[i]\);) N
( line_length++;) S 24 T () S
(// For null character) c n
( }) p n
( ) N
( new_alias->string = malloc\(line_length\);) N
( ) S
(if) K
(\(new_alias->string == ) p
(NULL) K
(\){) p n
() S 8 T (perror\(") S
(Failed to add alias) str
("\);) p n
() S 8 T () S
(return) K
(;) p n
( }) N
() N
( memcpy\(new_alias->string , *cmd_argv, line_length\);) N
() N
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( detokenize\(new_alias->string, line_length\);) p n
() N
( ) S
(// Add the link to the next node) c n
( new_alias->next = env->aliases;) p n
( ) N
() N
( env->aliases = new_alias;) N
(}) N
() N
() N
() N
(/** ) c n
( * @brief Checks if a command entered is an alias.) N
( * ) N
( * @param env A pointer to the global ::kgenv object.) N
( * @param name The name to check. This should be argv[0] of the command that's) N
( * been entered. This function does not parse an entire command line.) N
( * ) N
( * @return If an alias exists with the name, a pointer to the ::aliasList node) N
( * where the alias is stored is returned. Otherwise NULL is returned if the) N
( * alias does not exist.) N
( */) N
(aliasList* is_alias\(kgenv* env, ) p
(char) k
(* name\){) p n
( aliasList* a = env->aliases;) N
() N
( ) S
(while) K
(\(a != ) p
(NULL) K
(\){) p n
() N
( ) S
(if) K
(\(strcmp\(name, a->name\) == 0\){) p n
( ) S
(return) K
( a;) p n
( }) N
() N
( a = a->next;) N
( }) N
( ) S
(return) K
( ) p
(NULL) K
(;) p n
(}) N
() N
(/** ) c n
( * @brief Removes an alias if it exists.) N
( *) N
( * Steps through the alias list \(::aliasList\) stored in the global ::kgenv) N
( * object. If an alias of the specified name is found, it is removed from the) N
( * list. No action is taken if an alias with the name is not found.) N
( * ) N
( * @param env The global ::kgenv environment object.) N
( * @param name The name of the alias to remove.) N
( *) N
( * @return True if an alias was removed. False otherwise.) N
( */) N
(bool remove_alias\(kgenv* env, ) p
(char) k
(* name\){) p n
() N
( aliasList* a = env->aliases;) N
( aliasList* prev = ) S
(NULL) K
(;) p n
() N
( ) S
(while) K
(\(a != ) p
(NULL) K
(\){) p n
() N
( ) S
(if) K
(\(strcmp\(name, a->name\) == 0\){) p n
() N
( ) S
(if) K
(\(prev != ) p
(NULL) K
(\){) p n
( prev->next = a->next;) N
( } ) S
(else) K
( {) p n
( env->aliases = a->next;) N
( }) N
() N
( free\(a->name\);) N
( free\(a->string\);) N
( free\(a\);) N
( ) S
(return) K
( true;) p n
() N
( }) N
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() p n
( prev = a;) N
( a = a->next;) N
( }) N
() N
( ) S
(return) K
( false;) p n
(}) N
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(/*) c n
( * CISC361: Operating Systems \(Fall 2009\)) N
( * Instructor: Ben Miller) N
( *) N
( * Project 2) N
( * Kevin Graney) N
( */) N
() p n
(/** ) c n
( * @file builtins.c) N
( * @brief Definitions of builtin functions.) N
( * @author Kevin Graney) N
( * @version v0.1) N
( * @date 2009-08-02) N
( */) N
(#include) K
( ") p
(builtins.h) str
(") p n
(#include) K
( ") p
(get_path.h) str
(") p n
(#include) K
( ") p
(alias.h) str
(") p n
(#include) K
( ") p
(wildcard.h) str
(") p n
(#include) K
( ") p
(watchmail.h) str
(") p n
() N
(#include) K
( <readline/readline.h>) p n
() N
(extern) K
( ) p
(int) k
( errno;) p n
() N
(//------------------------------------------------------------------------------) c n
(//-- The following constants define the built-in commands. The commands are) N
(//-- matched to the function pointers with a one-to-one matching done in order.) N
(//------------------------------------------------------------------------------) N
() p n
(/** ) c n
( * @brief Stores the commands that map to the built-in functions.) N
( *) N
( * These strings are what, if entered as the zeroth argument \(argv[0]\) in a) N
( * command will execute a built-in function.) N
( */) N
(const) K
( ) p
(char) k
(* BUILT_IN_COMMANDS[] = {) p n
( ") S
(exit) str
(",) p n
( ") S
(which) str
(",) p n
( ") S
(where) str
(",) p n
( ") S
(cd) str
(",) p n
( ") S
(pwd) str
(",) p n
( ") S
(list) str
(",) p n
( ") S
(pid) str
(",) p n
( ") S
(kill) str
(", ) p n
( ") S
(prompt) str
(",) p n
( ") S
(printenv) str
(",) p n
( ") S
(alias) str
(",) p n
( ") S
(unalias) str
(", ) p
(// Not a requirement, but easy to add. ) c n
( ") p
(history) str
(", ) p n
( ") S
(setenv) str
(",) p n
( ") S