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Append a record to the end of a text file: Difference between revisions

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Append a record to the end of a text file (view source)

Revision as of 15:12, 29 December 2021

13,576 bytes added ,  2 years ago
m
→‎{{header|Phix}}: added syntax colouring, marked p2js incompatible
m (→‎{{header|Phix}}: added syntax colouring, marked p2js incompatible)
Line 2,865:
same process, in which case locking does not make any real difference - because there is no task_yield() in a locked state.
You can also test the locking when running multiple processes/threads by uncommenting the wait_key() lines.
<!--<lang Phix>constant filename = "passwd.txt"(notonline)-->
<span style="color: #008080;">without</span> <span style="color: #008080;">js</span> <span style="color: #000080;font-style:italic;">-- (file i/o, sleep, task_yield, wait_key)</span>
integer fn
<span style="color: #008080;">constant</span> <span style="color: #000000;">filename</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">"passwd.txt"</span>
 
<span style="color: #004080;">integer</span> <span style="color: #000000;">fn</span>
constant
rec1 = {"jsmith","x",1001,1000,{"Joe Smith","Room 1007","(234)555-8917","(234)555-0077","jsmith@rosettacode.org"},"/home/jsmith","/bin/bash"},
<span style="color: #008080;">constant</span>
rec2 = {"jdoe","x",1002,1000,{"Jane Doe","Room 1004","(234)555-8914","(234)555-0044","jdoe@rosettacode.org"},"/home/jdoe","/bin/bash"},
<span style="color: #000000;">rec1</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{</span><span style="color: #008000;">"jsmith"</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"x"</span><span style="color: #0000FF;">,</span><span style="color: #000000;">1001</span><span style="color: #0000FF;">,</span><span style="color: #000000;">1000</span><span style="color: #0000FF;">,{</span><span style="color: #008000;">"Joe Smith"</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"Room 1007"</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"(234)555-8917"</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"(234)555-0077"</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"jsmith@rosettacode.org"</span><span style="color: #0000FF;">},</span><span style="color: #008000;">"/home/jsmith"</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"/bin/bash"</span><span style="color: #0000FF;">},</span>
rec3 = {"xyz","x",1003,1000,{"X Yz","Room 1003","(234)555-8913","(234)555-0033","xyz@rosettacode.org"},"/home/xyz","/bin/bash"}
<span style="color: #000000;">rec2</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{</span><span style="color: #008000;">"jdoe"</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"x"</span><span style="color: #0000FF;">,</span><span style="color: #000000;">1002</span><span style="color: #0000FF;">,</span><span style="color: #000000;">1000</span><span style="color: #0000FF;">,{</span><span style="color: #008000;">"Jane Doe"</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"Room 1004"</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"(234)555-8914"</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"(234)555-0044"</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"jdoe@rosettacode.org"</span><span style="color: #0000FF;">},</span><span style="color: #008000;">"/home/jdoe"</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"/bin/bash"</span><span style="color: #0000FF;">},</span>
 
<span style="color: #000000;">rec3</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{</span><span style="color: #008000;">"xyz"</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"x"</span><span style="color: #0000FF;">,</span><span style="color: #000000;">1003</span><span style="color: #0000FF;">,</span><span style="color: #000000;">1000</span><span style="color: #0000FF;">,{</span><span style="color: #008000;">"X Yz"</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"Room 1003"</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"(234)555-8913"</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"(234)555-0033"</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"xyz@rosettacode.org"</span><span style="color: #0000FF;">},</span><span style="color: #008000;">"/home/xyz"</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"/bin/bash"</span><span style="color: #0000FF;">}</span>
function tostring(sequence record)
record[3] = sprintf("%d",{record[3]})
<span style="color: #008080;">function</span> <span style="color: #000000;">tostring</span><span style="color: #0000FF;">(</span><span style="color: #004080;">sequence</span> <span style="color: #000000;">record</span><span style="color: #0000FF;">)</span>
record[4] = sprintf("%d",{record[4]})
<span style="color: #000000;">record</span><span style="color: #0000FF;">[</span><span style="color: #000000;">3</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">sprintf</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"%d"</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">record</span><span style="color: #0000FF;">[</span><span style="color: #000000;">3</span><span style="color: #0000FF;">]})</span>
record[5] = join(record[5],",")
<span style="color: #000000;">record</span><span style="color: #0000FF;">[</span><span style="color: #000000;">4</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">sprintf</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"%d"</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">record</span><span style="color: #0000FF;">[</span><span style="color: #000000;">4</span><span style="color: #0000FF;">]})</span>
record = join(record,":")
<span style="color: #000000;">record</span><span style="color: #0000FF;">[</span><span style="color: #000000;">5</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">join</span><span style="color: #0000FF;">(</span><span style="color: #000000;">record</span><span style="color: #0000FF;">[</span><span style="color: #000000;">5</span><span style="color: #0000FF;">],</span><span style="color: #008000;">","</span><span style="color: #0000FF;">)</span>
return record
<span style="color: #000000;">record</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">join</span><span style="color: #0000FF;">(</span><span style="color: #000000;">record</span><span style="color: #0000FF;">,</span><span style="color: #008000;">":"</span><span style="color: #0000FF;">)</span>
end function
<span style="color: #008080;">return</span> <span style="color: #000000;">record</span>
 
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
procedure wait(string what)
?sprintf("wait (%s)",{what})
<span style="color: #008080;">procedure</span> <span style="color: #000000;">wait</span><span style="color: #0000FF;">(</span><span style="color: #004080;">string</span> <span style="color: #000000;">what</span><span style="color: #0000FF;">)</span>
sleep(1)
<span style="color: #0000FF;">?</span><span style="color: #7060A8;">sprintf</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"wait (%s)"</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">what</span><span style="color: #0000FF;">})</span>
task_yield()
<span style="color: #7060A8;">sleep</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">)</span>
end procedure
<span style="color: #000000;">task_yield</span><span style="color: #0000FF;">()</span>
 
<span style="color: #008080;">end</span> <span style="color: #008080;">procedure</span>
if not file_exists(filename) then
fn = open(filename,"w")
<span style="color: #008080;">if</span> <span style="color: #008080;">not</span> <span style="color: #7060A8;">file_exists</span><span style="color: #0000FF;">(</span><span style="color: #000000;">filename</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">then</span>
if fn!=-1 then -- (someone else just beat us to it?)
<span style="color: #000000;">fn</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">open</span><span style="color: #0000FF;">(</span><span style="color: #000000;">filename</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"w"</span><span style="color: #0000FF;">)</span>
printf(fn,"account:password:UID:GID:fullname,office,extension,homephone,email:directory:shell\n")
<span style="color: #008080;">if</span> <span style="color: #000000;">fn</span><span style="color: #0000FF;">!=-</span><span style="color: #000000;">1</span> <span style="color: #008080;">then</span> <span style="color: #000080;font-style:italic;">-- (someone else just beat us to it?)</span>
printf(fn,"%s\n",{tostring(rec1)})
<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">fn</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"account:password:UID:GID:fullname,office,extension,homephone,email:directory:shell\n"</span><span style="color: #0000FF;">)</span>
printf(fn,"%s\n",{tostring(rec2)})
<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">fn</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"%s\n"</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">tostring</span><span style="color: #0000FF;">(</span><span style="color: #000000;">rec1</span><span style="color: #0000FF;">)})</span>
close(fn)
<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">fn</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"%s\n"</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">tostring</span><span style="color: #0000FF;">(</span><span style="color: #000000;">rec2</span><span style="color: #0000FF;">)})</span>
end if
<span style="color: #7060A8;">close</span><span style="color: #0000FF;">(</span><span style="color: #000000;">fn</span><span style="color: #0000FF;">)</span>
end if
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
while 1 do
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
fn = open(filename,"a")
<span style="color: #008080;">while</span> <span style="color: #000000;">1</span> <span style="color: #008080;">do</span>
if fn!=-1 then exit end if
<span style="color: #000000;">fn</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">open</span><span style="color: #0000FF;">(</span><span style="color: #000000;">filename</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"a"</span><span style="color: #0000FF;">)</span>
wait("append")
<span style="color: #008080;">if</span> <span style="color: #000000;">fn</span><span style="color: #0000FF;">!=-</span><span style="color: #000000;">1</span> <span style="color: #008080;">then</span> <span style="color: #008080;">exit</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
end while
<span style="color: #000000;">wait</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"append"</span><span style="color: #0000FF;">)</span>
-- ?"file open in append mode"; {} = wait_key()
<span style="color: #008080;">end</span> <span style="color: #008080;">while</span>
while 1 do
<span style="color: #000080;font-style:italic;">--?"file open in append mode"; {} = wait_key()</span>
if lock_file(fn,LOCK_EXCLUSIVE,{}) then exit end if
<span style="color: #008080;">while</span> <span style="color: #000000;">1</span> <span style="color: #008080;">do</span>
wait("lock")
<span style="color: #008080;">if</span> <span style="color: #000000;">lock_file</span><span style="color: #0000FF;">(</span><span style="color: #000000;">fn</span><span style="color: #0000FF;">,</span><span style="color: #000000;">LOCK_EXCLUSIVE</span><span style="color: #0000FF;">,{})</span> <span style="color: #008080;">then</span> <span style="color: #008080;">exit</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
end while
<span style="color: #000000;">wait</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"lock"</span><span style="color: #0000FF;">)</span>
-- ?"file locked"; {} = wait_key()
<span style="color: #008080;">end</span> <span style="color: #008080;">while</span>
printf(fn,"%s\n",{tostring(rec3)})
<span style="color: #000080;font-style:italic;">--?"file locked"; {} = wait_key()</span>
unlock_file(fn,{})
<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">fn</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"%s\n"</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">tostring</span><span style="color: #0000FF;">(</span><span style="color: #000000;">rec3</span><span style="color: #0000FF;">)})</span>
close(fn)
<span style="color: #000000;">unlock_file</span><span style="color: #0000FF;">(</span><span style="color: #000000;">fn</span><span style="color: #0000FF;">,{})</span>
while 1 do
<span style="color: #7060A8;">close</span><span style="color: #0000FF;">(</span><span style="color: #000000;">fn</span><span style="color: #0000FF;">)</span>
fn = open(filename,"r")
<span style="color: #008080;">while</span> <span style="color: #000000;">1</span> <span style="color: #008080;">do</span>
if fn!=-1 then exit end if
<span style="color: #000000;">fn</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">open</span><span style="color: #0000FF;">(</span><span style="color: #000000;">filename</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"r"</span><span style="color: #0000FF;">)</span>
wait("read")
<span style="color: #008080;">if</span> <span style="color: #000000;">fn</span><span style="color: #0000FF;">!=-</span><span style="color: #000000;">1</span> <span style="color: #008080;">then</span> <span style="color: #008080;">exit</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
end while
<span style="color: #000000;">wait</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"read"</span><span style="color: #0000FF;">)</span>
 
<span style="color: #008080;">end</span> <span style="color: #008080;">while</span>
?gets(fn)
while 1 do
<span style="color: #0000FF;">?</span><span style="color: #7060A8;">gets</span><span style="color: #0000FF;">(</span><span style="color: #000000;">fn</span><span style="color: #0000FF;">)</span>
object line = gets(fn)
<span style="color: #008080;">while</span> <span style="color: #000000;">1</span> <span style="color: #008080;">do</span>
if atom(line) then exit end if
<span style="color: #004080;">object</span> <span style="color: #000000;">line</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">gets</span><span style="color: #0000FF;">(</span><span style="color: #000000;">fn</span><span style="color: #0000FF;">)</span>
?line
<span style="color: #008080;">if</span> <span style="color: #004080;">atom</span><span style="color: #0000FF;">(</span><span style="color: #000000;">line</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">then</span> <span style="color: #008080;">exit</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
{line} = scanf(line,"%s:%s:%d:%d:%s:%s:%s\n")
<span style="color: #0000FF;">?</span><span style="color: #000000;">line</span>
line[5] = split(line[5],',')
<span style="color: #0000FF;">{</span><span style="color: #000000;">line</span><span style="color: #0000FF;">}</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">scanf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">line</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"%s:%s:%d:%d:%s:%s:%s\n"</span><span style="color: #0000FF;">)</span>
?line
<span style="color: #000000;">line</span><span style="color: #0000FF;">[</span><span style="color: #000000;">5</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">split</span><span style="color: #0000FF;">(</span><span style="color: #000000;">line</span><span style="color: #0000FF;">[</span><span style="color: #000000;">5</span><span style="color: #0000FF;">],</span><span style="color: #008000;">','</span><span style="color: #0000FF;">)</span>
end while
<span style="color: #0000FF;">?</span><span style="color: #000000;">line</span>
close(fn)</lang>
<span style="color: #008080;">end</span> <span style="color: #008080;">while</span>
<span style="color: #7060A8;">close</span><span style="color: #0000FF;">(</span><span style="color: #000000;">fn</span><span style="color: #0000FF;">)</span>
<!--</lang>-->
{{out}}
<pre>
Petelomax
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