striping white space and line

blackzone · 11-21-2004, 11:04 PM

I need to write a c program which would strip off all white space, tab, line feed of the beginning and end of a string.

Can anyone suggest a good way?

itsme86 · 11-21-2004, 11:51 PM

I'd suggest 2 loops. One that iterates through from the beginning of the string and one from the end. In the first loop, you can use memmove() to keep copying index+1 to index as long as string[index] is a space, tab, or new line. In the second loop you can just keep setting string[index] to '\0' as long as string[index] is a space, tab, or new line.

jlliagre · 11-22-2004, 02:04 AM

Code:

char *trim(char *s)
{
  int n=strlen(s)-1;
  while(*s && *s<=' ')
  {
    ++s;
  }
  s=strdup(s);
  while(n && s[n] <= ' ')
  {
    s[n--]='\0';
  }
  return(s);
}