path: root/usr.bin/make/lowparse.c

/*	$OpenBSD: lowparse.c,v 1.1 2000/06/23 16:39:45 espie Exp $ */

/* low-level parsing functions. */

/*
 * Copyright (c) 1999,2000 Marc Espie.
 *
 * Extensive code changes for the OpenBSD project.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OPENBSD
 * PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdarg.h>
#include <stdio.h>
#include <assert.h>
#include "make.h"
#include "buf.h"
#include "lowparse.h"

#ifdef CLEANUP
static LIST	    fileNames;	/* file names to free at end */
#endif

static LIST     includes;  	/* stack of IFiles generated by
				 * #includes */

static IFile *new_ifile __P((char *, FILE *));
static IFile *new_istring __P((char *, char *, unsigned long));
static void free_ifile __P((IFile *));
static void ParseVErrorInternal __P((char *, unsigned long, int, char *, va_list));
static int skiptoendofline __P((void));
static int ParseSkipEmptyLines __P((Buffer));
static int	    fatals = 0;

/*-
 * ParseVErrorInternal  --
 *	Error message abort function for parsing. Prints out the context
 *	of the error (line number and file) as well as the message with
 *	two optional arguments.
 *
 * Side Effects:
 *	"fatals" is incremented if the level is PARSE_FATAL.
 */
/* VARARGS */
static void
#ifdef __STDC__
ParseVErrorInternal(char *cfname, unsigned long clineno, int type, char *fmt,
    va_list ap)
#else
ParseVErrorInternal(va_alist)
	va_dcl
#endif
{
	(void)fprintf(stderr, "\"%s\", line %lu: ", cfname, clineno);
	if (type == PARSE_WARNING)
		(void)fprintf(stderr, "warning: ");
	(void)vfprintf(stderr, fmt, ap);
	va_end(ap);
	(void)fprintf(stderr, "\n");
	if (type == PARSE_FATAL)
		fatals ++;
}

/*-
 * Parse_Error  --
 *	External interface to ParseVErrorInternal; uses the default filename
 *	Line number.
 */
/* VARARGS */
void
#ifdef __STDC__
Parse_Error(int type, char *fmt, ...)
#else
Parse_Error(va_alist)
	va_dcl
#endif
{
	va_list ap;
#ifdef __STDC__
	va_start(ap, fmt);
#else
	int type;		/* Error type (PARSE_WARNING, PARSE_FATAL) */
	char *fmt;

	va_start(ap);
	type = va_arg(ap, int);
	fmt = va_arg(ap, char *);
#endif

	ParseVErrorInternal(current->fname, current->lineno, type, fmt, ap);
}

static IFile *
new_ifile(name, stream)
    char *name;
    FILE *stream;
{
    IFile *ifile;
#ifdef CLEANUP
    Lst_AtEnd(&fileNames, name);
#endif

    ifile = emalloc(sizeof(*ifile));
    ifile->fname = name;
    /* Naturally enough, we start reading at line 0 */
    ifile->lineno = 0;
    ifile->F = stream;
    ifile->ptr = ifile->end = NULL;
    return ifile;
}

static void
free_ifile(ifile)
    IFile *ifile;
{
    if (ifile->F)
    	(void)fclose(ifile->F);
    else
    	free(ifile->str);
    /* Note we can't free the file names yet, as they are embedded in GN for
     * error reports. */
    free(ifile);
}

static IFile *
new_istring(str, name, lineno)
    char *str;
    char *name;
    unsigned long lineno;
{
    IFile *ifile;

    ifile = emalloc(sizeof(*ifile));
    ifile->fname = name;
    ifile->F = NULL;
    /* Strings are used from for loops... */
    ifile->lineno = lineno;
    ifile->ptr = ifile->str = str;
    ifile->end = str + strlen(str);
    return ifile;
}


/*-
 *---------------------------------------------------------------------
 * Parse_FromString  --
 *	Start Parsing from the given string
 *
 * Side Effects:
 *	A structure is added to the includes Lst and readProc, lineno,
 *	fname and curFILE are altered for the new file
 *---------------------------------------------------------------------
 */
void
Parse_FromString(str, lineno)
    char 		*str;
    unsigned long 	lineno;
{
    if (DEBUG(FOR))
	(void)fprintf(stderr, "%s\n----\n", str);

    if (current != NULL)
	Lst_AtFront(&includes, current);
    current = new_istring(str, current->fname, lineno);
}


void 
Parse_FromFile(name, stream)
    char		*name;
    FILE		*stream;
{
    if (current != NULL)
    	Lst_AtFront(&includes, current);
    current = new_ifile(name, stream);
}

/*-
 *---------------------------------------------------------------------
 * Parse_NextFile -- 
 *	Called when EOF is reached in the current file. If we were reading
 *	an include file, the includes stack is popped and things set up
 *	to go back to reading the previous file at the previous location.
 *
 * Results:
 *	CONTINUE if there's more to do. DONE if not.
 *
 * Side Effects:
 *	The old curFILE, is closed. The includes list is shortened.
 *	lineno, curFILE, and fname are changed if CONTINUE is returned.
 *---------------------------------------------------------------------
 */
Boolean
Parse_NextFile()
{
    IFile *next;

    next = (IFile *)Lst_DeQueue(&includes);
    if (next != NULL) {
	if (current != NULL)
	    free_ifile(current);
	current = next;
    	return TRUE;
    } else
    	return FALSE;
}


int
newline()
{
    size_t len;

    if (current->F) {
	current->ptr = fgetln(current->F, &len);
	if (current->ptr) {
	    current->end = current->ptr + len;
	    return *current->ptr++;
	} else {
	    current->end = NULL;
	}
    }
    return EOF;
}

void 
ParseUnreadc(c)
	char c;
{
	current->ptr--;
	*current->ptr = c;
}

unsigned long
Parse_Getlineno()
{
    return current->lineno;
}

const char *
Parse_Getfilename()
{
    return current->fname;
}

#ifdef CLEANUP
void
LowParse_Init()
{
    Lst_Init(&includes);
    current = NULL;
}

void
LowParse_End()
{
    Lst_Destroy(&includes, NOFREE);	/* Should be empty now */
}
#endif
	

void
Finish_Errors()
{
    if (current != NULL) {
    	free_ifile(current);
	current = NULL;
    }
    if (fatals) {
	fprintf(stderr, "Fatal errors encountered -- cannot continue\n");
	exit(1);
    }
}