How to trim the white space around a string in C program Post: 302245905

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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

10-11-2008

Registered User

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..

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LEARN ABOUT DEBIAN

strltrim

STRLTRIM(3pub)						       C Programmer's Manual						    STRLTRIM(3pub)

NAME

       strltrim - remove leading whitespace from string

SYNOPSIS

       #include <publib.h>
       char *strltrim(char *s);

DESCRIPTION

       strltrim  removes all leading whitespace characters from the beginning of a string, by moving everything starting from the first non-white-
       space character to the beginning of the string.	As whitespace is counted everything for which isspace(3) returns true.

RETURN VALUE

       strltrim returns its argument.

EXAMPLE

       To remove all indentation from all lines in a program, you might do the following:

	    #include <publib.h>

	    int main(void) {
		 char line[512];

		 while (fgets(line, sizeof(line), stdio) != NULL) {
		      strltrim(line);
		      printf("%s", line);
		 }
		 return 0;
	    }

SEE ALSO

       publib(3), strrtrim(3), strtrim(3), isspace(3)

AUTHOR

       Lars Wirzenius (lars.wirzenius@helsinki.fi)

Publib							       C Programmer's Manual						    STRLTRIM(3pub)

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