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/*
 *	Read in makefile
 */


#include "h.h"


int			lineno;


/*
 *	Syntax error handler.  Print message, with line number, and exits.
 */
void
error(msg, a1, a2, a3)
char *			msg;
{
	fprintf(stderr, "%s: ", myname);
	fprintf(stderr, msg, a1, a2, a3);
	if (lineno)
		fprintf(stderr, " near line %d", lineno);
	fputc('\n', stderr);
	EXIT(1);
}


/*
 *	Read a line into the supplied string of length LZ.  Remove
 *	comments, ignore blank lines. Deal with	quoted (\) #, and
 *	quoted newlines.  If EOF return TRUE.
 */
bool
getline(str, fd)
char *		str;
FILE *		fd;
{
	register char *		p;
	char *			q;
	int			pos = 0;


	for (;;)
	{
		if (fgets(str+pos, LZ-pos, fd) == NULL_CHARP)
			return TRUE;		/*  EOF  */

		lineno++;

		if ((p = index(str+pos, '\n')) == NULL_CHARP)
			error("Line too long");

		if (p[-1] == '\\')
		{
			p[-1] = '\n';
			pos = p - str;
			continue;
		}

		p = str;
		while (((q = index(p, '#')) != NULL_CHARP) &&
		    (p != q) && (q[-1] == '\\'))
		{
			char	*a;

			a = q - 1;	/*  Del \ chr; move rest back  */
			p = q;
			while (*a++ = *q++)
				;
		}
		if (q != NULL_CHARP)
		{
			q[0] = '\n';
			q[1] = '\0';
		}

		p = str;
		while (isspace(*p))	/*  Checking for blank  */
			p++;

		if (*p != '\0')
			return FALSE;
		pos = 0;
	}
}


/*
 *	Get a word from the current line, surounded by white space.
 *	return a pointer to it. String returned has no white spaces
 *	in it.
 */
char *
gettok(ptr)
char	**ptr;
{
	register char *		p;


	while (isspace(**ptr))	/*  Skip spaces  */
		(*ptr)++;

	if (**ptr == '\0')	/*  Nothing after spaces  */
		return NULL;

	p = *ptr;		/*  word starts here  */

	while ((**ptr != '\0') && (!isspace(**ptr)))
		(*ptr)++;	/*  Find end of word  */

	*(*ptr)++ = '\0';	/*  Terminate it  */

	return(p);
}