Trim

Trim.c

/**********************************************************************
* Function:         trim_string("  my string   ")
* Purpose:          trims spaces from front and back.
* Precondition:     a string pointer
* Postcondition:    string without leading or following spaces
************************************************************************/
void trim_string(char *string)
{
    left_trim(string);
    right_trim(string);
}

/**********************************************************************
* Function:         left_trim("   my string")
* Purpose:          trims spaces from front and back.
* Precondition:     a string pointer
* Postcondition:    string without leading spaces`
************************************************************************/
void right_trim(char *string)
{
    //find the end of string
    while(*string != 0)
        string++;

    //now were at the end. Backup one and see if space
    string--;
    while(*string == ' ')
        *(string--) = 0;
}
/* Belongs in its own file */
/**********************************************************************
* Function:         right_trim("my string   ")
* Purpose:          trims spaces from end.
* Precondition:     a string pointer
* Postcondition:    string without ending spaces.
************************************************************************/
void left_trim(char *string)
{
    char *begin = string;
    //front spaces removal
    while(*string == ' ')
        string++;

    //did we have spaces? copy over them
    if (string != begin)
        memmove(begin, string, strlen(string) + 1);
}