Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: How to trim the white space around a string in C program
Top Forums Programming How to trim the white space around a string in C program Post 302245905 by jim mcnamara on Saturday 11th of October 2008 03:56:47 PM
Old 10-11-2008
Note to anybody copying code: both of calv's examples will segfault as posted. I have not had time to mess with it. On Monday I can get time to post something.

Segfaults on the condition when there are no spaces in the string, for example.
Plus undeclared variables.... maybe someone else can fix it.

edit: corrected code
Code:
void trim_copy(char *input, char *output)
{
  char *end =NULL   //  ouput;
  char c;

  // skip spaces at start
  while(*input && isspace(*input))
    ++input;

  // copy the rest while remembering the last non-whitespace
  while(*input)
  {
    // copy character
    c = *(output++) = *(input++);

    // if its not a whitespace, this *could* be the last character
    if( !isspace(c) )
      end = output;
  }

  // white the terminating zero after last non-whitespace
  if(end!=NULL) *end = 0;
}

Code:
similar changes are needed for the other example, trim_nocopy();

Last edited by jim mcnamara; 10-13-2008 at 11:03 AM..
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

How to trim space in output variable ?

Hi , I have a code like this: uid=scott password=tiger database=db01 cat >runid_val.sql<<-EOA SET ECHO OFF SET FEEDBACK OFF SET HEADING OFF SELECT trim(runid_seq.nextval) FROM dual; EXIT EOA echo `cat runid_val.sql` V_RUNID=`sqlplus -s $uid/$password@$database @runid_val.sql`... (5 Replies)
Discussion started by: vj_76
5 Replies

2. Shell Programming and Scripting

Trim white spaces using awk

Hi, I have a CSV file with footer information as below. The third value is the number of records in the file. Sometimes it contains both leading and trailing white spaces which i want to trim using awk. C,FOOTER , 00000642 C,FOOTER , 00000707 C, FOOTER,... (2 Replies)
Discussion started by: mona
2 Replies

3. Shell Programming and Scripting

stripping white space...

Hi All; Having a problem with a file.. the file contains the following data... (a snapshot) 1331F9E9DB7C2BB80EAEDE3A8F043B94,AL7 1DZ,M,50 186FDF93E1303DBA217279EC3671EA91,NG5 1JU,M,24 3783FFAF602015056A8CD21104B1AAAF,CH42 4NQ,M,17 It has 3 columns sepreated by a , the second column... (7 Replies)
Discussion started by: Zak
7 Replies

4. UNIX for Dummies Questions & Answers

SED with White Space

Dear Members, Suppose i have a variable test which stores a string as below: test='John drives+++++++++a+++++car' now i want to use sed on the above variable and replace + with a white space, so that i get echo $test should give me 'john drives a car' Between... (1 Reply)
Discussion started by: sandeep_1105
1 Replies

5. Shell Programming and Scripting

sed + white space

Hi, What sed command (if sed is the right command) can remove ALL white space from my file. I have a csv, except I want to remove all white space between commas and characters. My idea (without testing) sed 's/ //g' Is there a better way? (18 Replies)
Discussion started by: mcclunyboy
18 Replies

6. UNIX for Dummies Questions & Answers

filename with white space

our user creates a text file with a white space on the filename. this same file is transfered to unix via automation tool. i have a korn shell script that reads these files on a input directory and connects to oracle database to run the oracle procedures which will load the data from each of the... (2 Replies)
Discussion started by: wtolentino
2 Replies

7. Shell Programming and Scripting

awk - trim white space from a field / variable

Hi, Consider the data (FS = |): 1| England |end 2| New Zealand |end 3|Australia|end 4| Some Made Up Country |end 5| West Indies|end I want the output to be (i.e. without the leading and trailing white space from $2) England New Zealand Australia Some Made Up Country West... (4 Replies)
Discussion started by: Storms
4 Replies

8. Shell Programming and Scripting

Add white space

hi guys how can i add spacein file name with sed if strings have no space around dash input 19-20 ( 18-19 ) ABC-EFG output after add white space 19 - 20 (18 - 19 ) ABC - EFG thx in advance (2 Replies)
Discussion started by: mhs
2 Replies

9. Shell Programming and Scripting

Putting white Space at the end of the string

Hi Guys, Hope, you all are doing good out there. I am writing a shell script and currrint in need of your help. This is what I need to do; I have position based plain file. One of the fields is 15 character long. I need to fill that field. The problem is that the value is dynamic, it could... (4 Replies)
Discussion started by: singh.chandan18
4 Replies

10. Shell Programming and Scripting

Trim Space

In Shell, I have output of a unix command as test1 test2015 but I want it as test1 test2015 can anyone help me out. Use code tags, thanks. (3 Replies)
Discussion started by: OscarS
3 Replies

LEARN ABOUT PLAN9

dd

DD(1)							      General Commands Manual							     DD(1)

NAME

       dd - convert and copy a file

SYNOPSIS

       dd [ option value ] ...

DESCRIPTION

       Dd  copies  the specified input file to the specified output with possible conversions.	The standard input and output are used by default.
       The input and output block size may be specified to take advantage of raw physical I/O.	The options are

       -if f   Open file f for input.

       -of f   Open file f for output.

       -ibs n  Set input block size to n bytes (default 512).

       -obs n  Set output block size (default 512).

       -bs n   Set both input and output block size, superseding ibs and obs.  If no conversion  is  specified,  preserve  the	input  block  size
	       instead of packing short blocks into the output buffer.	This is particularly efficient since no in-core copy need be done.

       -cbs n  Set conversion buffer size.

       -skip n Skip n input records before copying.

       -iseek n
	       Seek n records forward on input file before copying.

       -files n
	       Catenate n input files (useful only for magnetic tape or similar input device).

       -oseek n
	       Seek n records from beginning of output file before copying.

       -count n
	       Copy only n input records.

       -conv ascii    Convert EBCDIC to ASCII.

	    ebcdic   Convert ASCII to EBCDIC.

	    ibm      Like ebcdic but with a slightly different character map.

	    block    Convert variable length ASCII records to fixed length.

	    unblock  Convert fixed length ASCII records to variable length.

	    lcase    Map alphabetics to lower case.

	    ucase    Map alphabetics to upper case.

	    swab     Swap every pair of bytes.

	    noerror  Do not stop processing on an error.

	    sync     Pad every input record to ibs bytes.

       Where  sizes are specified, a number of bytes is expected.  A number may end with or to specify multiplication by 1024 or 512 respectively;
       a pair of numbers may be separated by to indicate a product.  Multiple conversions may be specified in the style:

       is used only if or conversion is specified.  In the first two cases, n characters are copied into  the  conversion  buffer,  any  specified
       character  mapping  is  done, trailing blanks are trimmed and new-line is added before sending the line to the output.  In the latter three
       cases, characters are read into the conversion buffer and blanks are added to make up an output record of size n.   If  is  unspecified	or
       zero,  the  and	options  convert the character set without changing the block structure of the input file; the and options become a simple
       file copy.

SOURCE

       /sys/src/cmd/dd.c

SEE ALSO

       cp(1)

DIAGNOSTICS

       Dd reports the number of full + partial input and output blocks handled.

																	     DD(1)
All times are GMT -4. The time now is 03:49 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy