Trim() function in C?

quick question: I'm looking for a way to remove the leading spaces from a character array. I know I could right my own algorithm to do this, but I was just curious if there is a pre-defined function or something for this purpose. I know other languages have functions like trim() and ltrim() and rtrim() -- does C have something like this? If so, can you tell me what it is and what library I would have to include to use it? Thank you!

Thanks, Bob! I certainly agree that strtok()--and more recently strsep()--should be in every programmer's bag of tricks, and I wouldn't be surprised if Tron's next thread follows up on your tip. Teaching Tron a new runtime function can be very rewarding, but the good deed carries with it some degree of responsibility. So I think that next thread will be all yours.
In my case, it's sometimes easier to crunch because I may be scanning certain patterns out of rich text, and when I find them I want to include them in a database. For example if I'm looking for the title of a section, I might seek to a particular paragraph style in RTF. If I recognize the title, I might prefer the crunched version in the database based on the assumption that excess white space is most likely a typo rather than a unique phrase that needs a new key (of course I might save the raw text as well so the document's author can receive a courteous e-mail pointing out that wrist protectors and sandwiches should be positioned away from the space bar). I used to get more interesting work btw, but lots of other pursuits were more interesting when I was younger.
So some of my nasty jobs are a little different from what we do in the front end of a compiler, etc. Whoever decided that a source code identifier couldn't include embedded spaces was really onto something. Where would we be today without that simple rule?
All the best,
\- Ray

Similar Messages

How do I use the TRIM function in my Query?

I have a field that has called AP.service_user_defined_1 that houses a Code the code is like Alpha Num ie "AA01" then it has about 30 to 40 whites spaces and then the description of what the code means. I need to have the description to show in my report I don't necessarily need the code but I do need the description I tried putting the TRIM Function in as below and it will not work what do I need to do to correct this?? I need help ASAP this is due today! Thanks for any help!
SELECT DISTINCT
          A1.AUTH_NUMBER,
PM.LAST_NAME,
          A1.AUTH_TYPE,
          A1.PLACE_OF_SERVICE,
          A1.OVERALL_STATUS,
          A1.CLOSED_REASON,
          A1.DENIED_REASON,
Case
when A1.DENIED_REASON in ('HS001','HS002') then 'MED NECESS'
when A1.DENIED_REASON in ('HS004','HS005','HS006','HS007','HS008','HS013','HS014','HS016','HS017','HS019','HS020') then 'Admin Denial'
when A1.DENIED_REASON is NUll and ap.advisor_decision = 'AAPPR' then 'Approved'
else 'Unknown'
end DENIED,
A1.admit_primary_date,
A1.service_admit_type AS "IP ADMIT TYPE",
A1.service_user_defined_1 AS "OP Serv Type",
Trim (leading ('AA01                 ',)from dual,
ap.contact_date,
AP.decision_date,
AP.ADVISOR_DECISION,
PM.PROVIDER_ID,
     A1.INSERT_DATETIME,
TO_CHAR (A1.insert_datetime,'MONTH-YY')AS "Month",
A1.admit_primary_date,
          A1.ACTIVE_PHYSICIAN_ADVISOR,
          MV.LINE_OF_BUSINESS
FROM Windsoradm.auth_master a1
INNER JOIN Windsoradm.auth_phys_advisor ap
ON a1.auth_number=ap.auth_number
INNER JOIN windsoradm.prov_master pm
ON ap.seq_prov_id=pm.seq_prov_id
LEFT JOIN windsoradm.note_master nm
ON nm.seq_memb_id=a1.seq_memb_id
INNER JOIN windsoradm.member_mv mv
ON mv.seq_memb_id=a1.seq_memb_id
Where mv.Line_of_Business <>'SFS'
/*AND A1.PLACE_OF_SERVICE IN ('11','21','22','24')*/
/*AND a1.active_physician_advisor = 'Y'*/
/*AND (a1.closed_reason ='A06' OR a1.closed_reason is Null)*/
AND a1.insert_datetime Between To_Date ('04/01/2012', 'MM/DD/YYYY') and To_Date ('04/30/2012','MM/DD/YYYY')
ORDER BY 1

I don't know how to use this within my query I put it in as you suggest and get an error: I'm new to these functions can you show me how within my query I should code it? The field Name is A1.service_user_defined_1 There are about 50 Different Codes in a Drop down list within the application that have a different Code and Different Description it appears that the Codes are all 4 character alpha numeric then about 25 to 45 spaces and then the description. Please show me in my code how to get this I wish there was a table I could link to that housed both code and description but who ever created this did not make life easy. Thanks (I also tried the TRIM but could not get it to work ) I know it is because I do not know how to put it within my code to make it work.
SELECT DISTINCT
          A1.AUTH_NUMBER,
PM.LAST_NAME,
          A1.AUTH_TYPE,
          A1.PLACE_OF_SERVICE,
          A1.OVERALL_STATUS,
          A1.CLOSED_REASON,
          A1.DENIED_REASON,
Case
when A1.DENIED_REASON in ('HS001','HS002') then 'MED NECESS'
when A1.DENIED_REASON in ('HS004','HS005','HS006','HS007','HS008','HS013','HS014','HS016','HS017','HS019','HS020') then 'Admin Denial'
when A1.DENIED_REASON is NUll and ap.advisor_decision = 'AAPPR' then 'Approved'
else 'Unknown'
end DENIED,
A1.admit_primary_date,
A1.service_admit_type AS "IP ADMIT TYPE",
A1.service_user_defined_1 AS "OP Serv Type",
regexp_replace('AA01 Behavioral/Mental Health Service', '^[^ ]+ +')from dual,
ap.contact_date,
     AP.decision_date,
     AP.ADVISOR_DECISION,
          PM.PROVIDER_ID,
     A1.INSERT_DATETIME,
TO_CHAR (A1.insert_datetime,'MONTH-YY')AS "Month",
A1.admit_primary_date,
          A1.ACTIVE_PHYSICIAN_ADVISOR,
          MV.LINE_OF_BUSINESS
FROM Windsoradm.auth_master a1
INNER JOIN Windsoradm.auth_phys_advisor ap
ON a1.auth_number=ap.auth_number
INNER JOIN windsoradm.prov_master pm
ON ap.seq_prov_id=pm.seq_prov_id
LEFT JOIN windsoradm.note_master nm
ON nm.seq_memb_id=a1.seq_memb_id
INNER JOIN windsoradm.member_mv mv
ON mv.seq_memb_id=a1.seq_memb_id
Where mv.Line_of_Business <>'SFS'
/*AND A1.PLACE_OF_SERVICE IN ('11','21','22','24')*/
/*AND a1.active_physician_advisor = 'Y'*/
/*AND (a1.closed_reason ='A06' OR a1.closed_reason is Null)*/
AND a1.insert_datetime Between To_Date ('04/01/2012', 'MM/DD/YYYY') and To_Date ('04/30/2012','MM/DD/YYYY')
ORDER BY 1

Using TRIM function in select statement

Hi All,
I'm using the TRIM function in my select statement to eliminate the white spaces.
But while using in select the TRIM function is not working in SQL*PLUS client(The query returns the white spaces also)
Kindly provide some pointers regarding the issue.........
I want to get only the data without the spaces in select statement
Regards,
Mohan

Hi, Mohan,
SQL*Plus always pads columns to make them line up nicely.
If you have a column declared as VARCHAR2 (20), then SQL*Plus will normally display 20 characters for that column, even in the maximum actual length is, say, 5 (or even if the column always happens to be NULL).
If you want the output to include only the actual data, without the padding that SQL*Plus adds, then concatenate all the columns into one big string column.
People often do something like the following to generate a CSV file, with no exta spaces:
SELECT       TO_CHAR (empno)
|| ',' || ename
|| ',' || job
|| ',' || TO_CHAR (deptno)
|| ',' || TO_CHAR (hiredate, 'DD-Mon-YYYY')     AS all_data
FROM          scott.emp;

Error when trying to use trim function

when i try to use trim function on a column it gives me following error for the below query
select trim(first_name) name from table1@pa1;
ORA-28500: connection from ORACLE to a non-Oracle system returned this message:
DSNT408I SQLCODE = -440, ERROR: NO FUNCTION BY THE NAME TRIM HAVING COMPATIBLE ARGUMENTS WAS FOUND IN THE CURRENT PATH DSNT418I SQLSTATE = 42884 SQLSTATE RETURN CODE DSNT415I SQLERRP = DSNXORFN SQL PROCEDURE DETECTING ERROR DSNT416I SQLERRD = -100 0 0 -1 0 0 SQL DIAGNOSTIC INFORMATION DSNT416I SQLERRD = X'FFFFFF
any idea gurus ???Thanks

This might work:
select trim(first_name) name from
(select first_name from table1@pa1);The problem is that pa1 is a non-Oracle database and does not have a trim function. It may have another function that does the same thing but it's not called TRIM.

Query with trim function running more than 15 hours..

Hi,
I have one select query which is running more than 15 hours.I have many trim() functions in that.and i have index for some columns for the tables that i used in that query.but it is not considering those indexes..
select
DISTINCT
trim(A.x) x,
trim(B.y) y,....... from A,B
Can anyone tell why this query is taking more time?and is there any other way for using the trim function?
Thanks in advance..

Note the name of this forum is "SQL Developer *(Not for general SQL/PLSQL questions)*", so only for issues with the SQL Developer tool. Please post these questions under the dedicated [SQL And PL/SQL|https://forums.oracle.com/forums/forum.jspa?forumID=75] forum.
Regards,
K.

Use Trim Function in this instance?

Oracle 10.2g
I have the following code (Thanks to michaels 2):
SQL> with t as (
select to_date('11/14/2003 7:39:00 PM','MM/DD/RRRR hh:mi:ss pm') time, 11122 home_team_id,null away_team_id,null home_team_name, 'parks' away_team_name,'Steve' offensive_player_moniker, 'Smith' offensive_player_last_name from dual union all
select to_date('11/14/2003 7:32:00 PM','MM/DD/RRRR hh:mi:ss pm'), null, 24555, null, 'bombers', 'Chris', 'Carter' from dual union all
select to_date('12/14/2008 1:35:00 PM','MM/DD/RRRR hh:mi:ss pm'), null, 33211, null, 'carts', 'Marty', 'Booker' from dual union all
select to_date('12/14/2008 1:30:00 PM','MM/DD/RRRR hh:mi:ss pm'), 15555, null, null, 'sharks', 'Bob', 'Sanders' from dual union all
select to_date('12/14/2008 1:38:00 PM','MM/DD/RRRR hh:mi:ss pm'), 15555, null, null, 'sharks', 'Marvin','Harrison' from dual
select away_team_name || ': ' || xmlagg(xmlelement(e, offensive_player_moniker || ' ' || offensive_player_last_name || ' (' || to_char(time,'hh:mi') || '), ')).extract('//text()') x from t
group by away_team_name
X
bombers: Chris Carter (07:32),
carts: Marty Booker (01:35),
parks: Steve Smith (07:39),
sharks: Bob Sanders (01:30), Marvin Harrison (01:38),
Desired output:
bombers: Chris Carter (07:32)
carts: Marty Booker (01:35)
parks: Steve Smith (07:39)
sharks: Bob Sanders (01:30), Marvin Harrison (01:38)How can i go about deleting the extra coma at the end when unnecessary. I' guessing the trim function could do it with an if-else clause, though i'm not sure what would go in the if-else clause

Since there's an additional blank as well you need to trim it as well
SQL> with t as (
select to_date('11/14/2003 7:39:00 PM','MM/DD/RRRR hh:mi:ss pm') time, 11122 home_team_id,null away_team_id,null home_team_name, 'parks' away_team_name,'Steve' offensive_player_moniker, 'Smith' offensive_player_last_name from dual union all
select to_date('11/14/2003 7:32:00 PM','MM/DD/RRRR hh:mi:ss pm'), null, 24555, null, 'bombers', 'Chris', 'Carter' from dual union all
select to_date('12/14/2008 1:35:00 PM','MM/DD/RRRR hh:mi:ss pm'), null, 33211, null, 'carts', 'Marty', 'Booker' from dual union all
select to_date('12/14/2008 1:30:00 PM','MM/DD/RRRR hh:mi:ss pm'), 15555, null, null, 'sharks', 'Bob', 'Sanders' from dual union all
select to_date('12/14/2008 1:38:00 PM','MM/DD/RRRR hh:mi:ss pm'), 15555, null, null, 'sharks', 'Marvin','Harrison' from dual
select rtrim(away_team_name || ': ' || xmlagg(xmlelement(e, offensive_player_moniker || ' ' || offensive_player_last_name || ' (' || to_char(time,'hh:mi') || '), ')).extract('//text()'), ', ') x from t
group by away_team_name
X
bombers: Chris Carter (07:32)
carts: Marty Booker (01:35)
parks: Steve Smith (07:39)
sharks: Bob Sanders (01:30), Marvin Harrison (01:38)

Trim Function in SQL Loader

Oracle version 10g
I have control file like below and would like to know is there a better way to declare trim function at the top level instead of specifying at field level. I want to remove leading or trailing spaces for the field.
LOAD DATA
INFILE *
TRUNCATE
INTO TABLE TMPTUPS_POD_DLY
ORD_NO POSITION(1:15) "TRIM(:ORD_NO)",
CUST_PO_NO POSITION(16:37) "TRIM(:CUST_PO_NO)",
SHP_NAME POSITION(38:72) "TRIM(:SHP_NAME)",
SHP_ADDR POSITION(73:102) "TRIM(:SHP_ADDR)",
SHP_CTY POSITION(103:132) "TRIM(:SHP_CTY)",
SHP_ST POSITION(133:134),
SHP_ZIP POSITION(135:144),
SHP_DT POSITION(145:154) DATE "YYYY-MM-DD",
TRCKNG_NO POSITION(155:184),
NOU POSITION(185:192) INTEGER EXTERNAL,
SHP_WGT POSITION(193:204) "TO_NUMBER(:SHP_WGT,'999999999999')/100",
POD_NAME POSITION(205:234) "TRIM(:POD_NAME)",
POD_DT POSITION(235:244) DATE "YYYY-MM-DD",
POD_TIME POSITION(245:252) DATE "HH:MI:SS",
AIR_BLL_PC POSITION(253:260) INTEGER EXTERNAL,
POD_STS_CD POSITION(261:262)
)

user13143312 wrote:
That's right. if I have 5 to 10 varchar2 columns I have to mention at the field level. Just like PRESERVE BLANKS or TRAILING NULLCOLS at the top level, I thought is there a way to trim all fields at the top level. I will continue to use at the field level. Thanks!http://download.oracle.com/docs/cd/B19306_01/server.102/b14215/ldr_field_list.htm#i1007768
If you specify them as varchar2's the trailing blanks will be trimmed.
Also ... to remove the leading blanks.
Optional Enclosure Delimiters
Leading whitespace is also removed from a field when optional enclosure delimiters are specified but not present.
Whenever optional enclosure delimiters are specified, SQL*Loader scans forward, looking for the first enclosure delimiter. If an enclosure delimiter is not found, SQL*Loader skips over whitespace, eliminating it from the field. The first nonwhitespace character signals the start of the field. This situation is shown in Field 2 in Figure 9-6. (In Field 1 the whitespace is included because SQL*Loader found enclosure delimiters for the field.)
"

About trim function capabulity

Hi Experts,
I have a some doubts regarding trim function.
1)trim function any limitations like it will trim for this munch length string(consider adding space also)? please consider in case of trimming spaces
Regards,
Surya

Hi, Surya,
surya wrote:
Hi Experts,
I have a some doubts regarding trim function.
1)trim function any limitations like it will trim for this munch length string(consider adding space also)? please consider in case of trimming spaces Good idea; let's simplify the conversation by saying we only want to trim spaces.
TRIM removes all of the spaces, regardless of how many there are.
If you want to limit the number of spaces it removes, then you have to use other functions, either in addition to or instead of TRIM. (REGEXP_REPLACE comes to mind quickly.)
I'm not sure what you're saying about "adding space also". LPAD and RPAD are rather like opposites of LTRIM and RTRIM. (There is no bi-directional PAD function.) RTRIM can remove spaces from the end of a string, RPAD can add spaces to the end of a string.
I hope this answers your question.
If not, post a little sample data (CREATE TABLE and INSERT statements, showing some strimgs you want to change), and also post the results you want from that data.
Explain, using specific examples, how you get those results from that data.
Always say which version of Oracle you're using.

Custom trim function

Hi,
public String myTrim(String str)
return str.replace(/^\s*|\s*$/g,"");
}I got this custom trim function from web,and it is working fine.
can anybody plz tell me how does the code str.replace(/^\s*|\s*$/g,"");trims the string.

You can write a trim function using regular expressions. What you have posted is code that uses regular expressions (but it doesn't compile) . For more info see:
http://java.sun.com/j2se/1.4.2/docs/api/java/util/regex/Pattern.html
and
http://www.regular-expressions.info
/Kaj

Trim Function

Hi,
BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Prod
PL/SQL Release 10.2.0.4.0 - Production
CORE 10.2.0.4.0 Production
TNS for 32-bit Windows: Version 10.2.0.4.0 - Production
NLSRTL Version 10.2.0.4.0 - Production
SQL> SELECT TRIM ('OLD' FROM 'OLDMAN') FROM DUAL;
SELECT TRIM ('OLD' FROM 'OLDMAN') FROM DUAL
ERROR at line 1:
ORA-30001: trim set should have only one characterDear All why this error....

TRIM function
TRIM is a function that takes a character expression and returns that expression with leading and/or trailing pad characters removed. Optional parameters indicate whether leading, or trailing, or both leading and trailing pad characters should be removed, and specify the pad character that is to be removed.
Syntax
TRIM( [ trimOperands ] trimSource)
trimOperands ::= { trimType [ trimCharacter ] FROM | trimCharacter FROM }
trimType ::= { LEADING | TRAILING | BOTH }
trimCharacter ::= CharacterExpression
trimSource ::= CharacterExpression
If trimType is not specified, it will default to BOTH. If trimCharacter is not specified, it will default to the space character (' '). Otherwise the trimCharacter expression must evaulate to one of the following:
a character string whose length is exactly one, or.
NULL
If either trimCharacter or trimSource evaluates to NULL, the result of the TRIM function is NULL. Otherwise, the result of the TRIM function is defined as follows:
If trimType is LEADING, the result will be the trimSource value with all leading occurrences of trimChar removed.
If trimType is TRAILING, the result will be the trimSource value with all trailing occurrences of trimChar removed.
If trimType is BOTH, the result will be the trimSource value with all leading and trailing occurrences of trimChar removed.

Trim function on varchar2 data

I just saw several programs, in which they have used TRIM function for a Varchar2 data type column. I thought it is not required. any thoughts?
Thanks for your time.

SQL> desc test_1;
Name                                      Null?    Type
SNO                                                NUMBER
SNAME                                              VARCHAR2(13)
SQL> select * from test_1;
       SNO SNAME
         1 abc
         2    xyz
         3 mno
         4     pqr
SQL> select sno,sname,trim(sname),length(sname) len1,length(trim(sname)) len2 from test_1;
       SNO SNAME         TRIM(SNAME)         LEN1       LEN2
         1 abc           abc                    3          3
         2    xyz        xyz                    6          3
         3 mno           mno                   11          3
         4     pqr       pqr                   13          3
SQL> alter table test_1 modify sname char(13);
Table altered.
SQL> desc test_1;
Name                                      Null?    Type
SNO                                                NUMBER
SNAME                                              CHAR(13)
SQL> select sno,sname,trim(sname),length(sname) len1,length(trim(sname)) len2 from test_1;
       SNO SNAME         TRIM(SNAME)         LEN1       LEN2
         1 abc           abc                   13          3
         2    xyz        xyz                   13          3
         3 mno           mno                   13          3
         4     pqr       pqr                   13          3
SQL>

About using TRIM function...

//I'm posting this after whole search of past discussion as everybody wants to do so. :-)
Hi,
I want to trim out white spaces from colums in my table when select executes.
I've read about TRIM function, but it does not as documented I think.
See below my pseudo-code from trimming.
SELECT trim (' ' from col1) | | col2, FROM TH_ABLICEN WHERE..blah..blah..This SQL query return me "ORA-00907: missing right parenthesis".
I don't know how can this returns...
TRIM function works only when its parameter is a constant and fails always when columns were injected as a parameter.
This situation is very obscure to me and make me wondering ORACLE's intention for this kind of inconvenience.
And I've tried replace (col1, ' ', '') only to fail.
So my question is...
1. How can use trim function?
2. What is the ordinary method being used by popular demand to trim out white spaces from a column?
Thanks in advance
Regards,
Ryan

<BLOCKQUOTE><font size="1" face="Verdana, Arial, Helvetica">quote:</font><HR>Originally posted by Adinath Kamode ([email protected]):
Hello,
Your query is correct. I tried it with 8.1.6 sql version. I modified it as follows.
select trim(' ' FROM ENAME)| |JOB FROM EMP;
about syntax you can specify column name in trim.
hope reply from you.
<HR></BLOCKQUOTE>
As mentioned in my first posting, it returns "ORA-00907: missing right parenthesis" error.
Anyway thanks for your concern.
Regards,
Ryan
null

How do I trim video clips in Quicktime Player? The "trim" function under the edit menu is gray and won't do anything.

I am trying to edit video clips from about two yesrs worth of video for an iMovie. I don't want to load all of the clips into a new event because it would be hours worth of video. I don't even know if iMovie could handle it. I have tried to use Quicktime Player to do this, but the "trim" function under the edit menu is gray and won't let me do anything. What can I do?

Thank you so much!
It works!
I used this code...
videoDisplay.addEventListener(VideoEvent.COMPLETE, videoCompleteHandler);
private function videoCompleteHandler(event:VideoEvent):void {
     hideVideo();
private function hideVideo():void {
     this.visible = false;
     this.includeInLayout = false;
I have a follow up question...
What is the syntax to target the video player from a different component to add an event listener to a button in the Sharing Widget called Back to Video?
Thanks!!
DK

Macbook Pro 2010 17" model and SSD and Trim Function?

If you purchase the Apple SSD drive 256 model when you buy the new macbook pro 17", does this SSD allow the Trim Functionality? Do you have to schedule the trim fuction with this drive or does the OS do it for you?

Use SuperDuper or Carbon Copy Cloner to make a bootable clone of your SSD on an external hard drive. The cloning process with either utility is self-explanatory, a matter of half a dozen or fewer clicks. Cloning back again requires only that you boot to the external drive, then open CCC or SD and repeat the process in the opposite direction. Nothing could be simpler.
Any FireWire or USB external drive that is known to be bootable in OS X will do. But avoid Western Digital external drives — they are very often problematical because of firmware that is preinstalled on them and is miserable to remove.
As for whether you can wipe an SSD on a Mac as completely as you can on a Windoze box, I can't answer that.

Reversing trim function on my iphone?

I recorded a video on my iphone, and by mistake using the trim function deleted most of video, any way to reverse or recover the video I deleted using the trim function?

Trimming Videos from page 128 of the iPhone iOS4 User Guide
"You can trim the frames from the beginning and end of a video that you just recorded, or any other video in the Camera Roll album. You can replace the original video or save the trimmed version as a new video clip....
Important: If you choose Trim Original, the trimmed frames are permanently deleted from the original video. If you choose “Save as New Clip,” a new trimmed video clip issaved in the Camera Roll album and the original video is unaffected."
So, which did you choose?

Trim function in forms

What is function to trim down the spaces in forms for varchar datatypes?
thanks

to trim space in front of a variable, use ltrim(v);
to trim space trailing a variable, rtrim(v);
to replace space inside a string, use replace().

Trim() function in C?

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