This is all just overkill. There are three variants to do trimming in C:
1. Output in another place
Code:
void trim_copy(char *input, char *output)
{
char *end = 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
*end = 0;
}
2. In place
Code:
void trim_inplace(char *s)
{
trim_copy(s, s);
}
3. In place, but avoid copying by shifting string pointer
Code:
char *trim_nocopy(char *s)
{
char *start = s;
// skip spaces at start
while(*start && isspace(*start))
++start;
char *i = start
// iterate over the rest remebering last non-whitespace
while(*i)
{
if( !isspace(*(i++)) )
end = i;
}
// white the terminating zero after last non-whitespace
*end = 0;
return start;
}
All three solutions are O(n). Use in place if you don't need the original anymore (and it's not constant like a literal). If you use new or malloc to allocate memory, then delete/free the original pointer in case 3, not the returning value.
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)
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)
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)
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)
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)
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)
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)
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)
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)
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 DEBIAN
strsplit
STRSPLIT(3pub) C Programmer's Manual STRSPLIT(3pub)NAME
strsplit - split string into words
SYNOPSIS
#include <publib.h>
int strsplit(char *src, char **words, int maxw, const char *sep);
DESCRIPTION
strsplit splits the src string into words separated by one or more of the characters in sep (or by whitespace characters, as specified by
isspace(3), if sep is the empty string). Pointers to the words are stored in successive elements in the array pointed to by words. No
more than maxw pointers are stored. The input string is modifed by replacing the separator character following a word with '