gettoken() function

[coder222]

hello,

I have been trying to understand this function, there is still a few things confusing me. First, what are those weird statements like return token type = BRACKETS for? I have never seen them before.

int gettoken(void)   /* return next token */


{
	
	int c, getch(void);
	void ungetch(int);
	char *p = token;  /* character string pointed by p */
	
	while ((c = getch()) == ' '  || c == '\t') /* skip blanks or tabs */
		;
	if (c == '(') {
		if ((c = getch()) == ')') { 
			strcpy(token, "()");         
			return tokentype = PARENS;  
		}  else {
			ungetch(c);   /* put character back on input before prosessing new input */           
			return tokentype = '(';
			
		 }
	 } else if (c == '[')  {
		 for (*p++ = c; (*p++ = getch()) != ']'; )  /* do nothing as long as character is not terminating bracket */ 
			 ;
		 *p = '\0';
		 return tokentype = BRACKETS;  /* if it is, we found it, so tokentype is brackets */
	 }   else if (isalpha(c))  {      
			for (*p++ = c; isalnum(c == getch()); ) /* read characters as long as is alphanumeric */
				*p++ = c;     
			*p = '\0';
			ungetch(c);          /* if not, push back into the buffer */
			return tokentype = NAME   /* how about these odd return statements?? */
		} else
			return tokentype = c;
  }

[laserlight]

First, what are those weird statements like return token type = BRACKETS for? I have never seen them before.

This:

return tokentype = BRACKETS;

is equivalent to:

tokentype = BRACKETS;
return tokentype;