view files.c @ 136:59680a727e9d

Improve previous. Just in case we ever crash and reach cleanup() while processing an -include foo option, take the array entry for it out of the array to make sure it doesn't get freed twice. This case shouldn't be reachable, but it's better to be safe.
author David A. Holland
date Tue, 09 Jul 2013 13:38:43 -0400
parents 1cda505ddc78
children ed45f2d8d3bc
line wrap: on
line source

/*-
 * Copyright (c) 2010, 2013 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by David A. Holland.
 *
 * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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 <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <err.h>

#include "array.h"
#include "mode.h"
#include "place.h"
#include "files.h"
#include "directive.h"

struct incdir {
	const char *name;
	bool issystem;
};

DECLARRAY(incdir, static UNUSED);
DEFARRAY(incdir, static);

static struct incdirarray quotepath, bracketpath;

////////////////////////////////////////////////////////////
// management

static
struct incdir *
incdir_create(const char *name, bool issystem)
{
	struct incdir *id;

	id = domalloc(sizeof(*id));
	id->name = name;
	id->issystem = issystem;
	return id;
}

static
void
incdir_destroy(struct incdir *id)
{
	dofree(id, sizeof(*id));
}

void
files_init(void)
{
	incdirarray_init(&quotepath);
	incdirarray_init(&bracketpath);
}

DESTROYALL_ARRAY(incdir, );

void
files_cleanup(void)
{
	incdirarray_destroyall(&quotepath);
	incdirarray_cleanup(&quotepath);
	incdirarray_destroyall(&bracketpath);
	incdirarray_cleanup(&bracketpath);
}

////////////////////////////////////////////////////////////
// path setup

void
files_addquotepath(const char *dir, bool issystem)
{
	struct incdir *id;

	id = incdir_create(dir, issystem);
	incdirarray_add(&quotepath, id, NULL);
}

void
files_addbracketpath(const char *dir, bool issystem)
{
	struct incdir *id;

	id = incdir_create(dir, issystem);
	incdirarray_add(&bracketpath, id, NULL);
}

////////////////////////////////////////////////////////////
// parsing

/*
 * Find the end of the logical line. End of line characters that are
 * commented out do not count.
 */
static
size_t
findeol(const char *buf, size_t start, size_t limit)
{
	size_t i;
	int incomment = 0;
	bool inquote = false;
	char quote = '\0';

	for (i=start; i<limit; i++) {
		if (incomment) {
			if (i+1 < limit && buf[i] == '*' && buf[i+1] == '/') {
				i++;
				incomment = 0;
			}
		} else if (!inquote && i+1 < limit &&
			   buf[i] == '/' && buf[i+1] == '*') {
			i++;
			incomment = 1;
		} else if (i+1 < limit &&
			   buf[i] == '\\' && buf[i+1] != '\n') {
			i++;
		} else if (!inquote && (buf[i] == '"' || buf[i] == '\'')) {
			inquote = true;
			quote = buf[i];
		} else if (inquote && buf[i] == quote) {
			inquote = false;
		} else if (buf[i] == '\n') {
			return i;
		}
	}
	return limit;
}

static
unsigned
countnls(const char *buf, size_t start, size_t limit)
{
	size_t i;
	unsigned count = 0;

	for (i=start; i<limit; i++) {
		if (buf[i] == '\n') {
			count++;
		}
	}
	return count;
}

static
void
file_read(const struct placefile *pf, int fd, const char *name, bool toplevel)
{
	struct place linestartplace, nextlinestartplace, ptmp;
	size_t bufend, bufmax, linestart, lineend, nextlinestart, tmp;
	ssize_t result;
	bool ateof = false;
	char *buf;

	place_setfilestart(&linestartplace, pf);
	nextlinestartplace = linestartplace;

	bufmax = 128;
	bufend = 0;
	linestart = 0;
	lineend = 0;
	buf = domalloc(bufmax);

	while (1) {
		if (lineend >= bufend) {
			/* do not have a whole line in the buffer; read more */
			assert(bufend >= linestart);
			if (linestart > 0 && bufend > linestart) {
				/* slide to beginning of buffer */
				memmove(buf, buf+linestart, bufend-linestart);
				bufend -= linestart;
				lineend -= linestart;
				linestart = 0;
			}
			if (bufend >= bufmax) {
				/* need bigger buffer */
				buf = dorealloc(buf, bufmax, bufmax*2);
				bufmax = bufmax*2;
			}

			if (ateof) {
				/* don't read again, in case it's a socket */
				result = 0;
			} else {
				result = read(fd, buf+bufend, bufmax - bufend);
			}

			if (result == -1) {
				/* read error */
				warn("%s", name);
				complain_fail();
			} else if (result == 0 && bufend == linestart) {
				/* eof */
				ateof = true;
				break;
			} else if (result == 0) {
				/* eof in middle of line */
				ateof = true;
				ptmp = linestartplace;
				ptmp.column += bufend - linestart;
				complain(&ptmp, "No newline at end of file");
				if (mode.werror) {
					complain_fail();
				}
				assert(bufend < bufmax);
				lineend = bufend++;
				buf[lineend] = '\n';
			} else {
				bufend += (size_t)result;
				lineend = findeol(buf, linestart, bufend);
			}
			/* loop in case we still don't have a whole line */
			continue;
		}

		/* have a line */
		assert(buf[lineend] == '\n');
		buf[lineend] = '\0';
		nextlinestart = lineend+1;
		nextlinestartplace.line++;

		/* check for CR/NL */
		if (lineend > 0 && buf[lineend-1] == '\r') {
			buf[lineend-1] = '\0';
			lineend--;
		}

		/* check for continuation line */
		if (lineend > 0 && buf[lineend-1]=='\\') {
			lineend--;
			tmp = nextlinestart - lineend;
			if (bufend > nextlinestart) {
				memmove(buf+lineend, buf+nextlinestart,
					bufend - nextlinestart);
			}
			bufend -= tmp;
			nextlinestart -= tmp;
			lineend = findeol(buf, linestart, bufend);
			/* might not have a whole line, so loop */
			continue;
		}

		/* line now goes from linestart to lineend */
		assert(buf[lineend] == '\0');

		/* count how many commented-out newlines we swallowed */
		nextlinestartplace.line += countnls(buf, linestart, lineend);

		/* if the line isn't empty, process it */
		if (lineend > linestart) {
			directive_gotline(&linestartplace,
					  buf+linestart, lineend-linestart);
		}

		linestart = nextlinestart;
		lineend = findeol(buf, linestart, bufend);
		linestartplace = nextlinestartplace;
	}

	if (toplevel) {
		directive_goteof(&linestartplace);
	}
	dofree(buf, bufmax);
}

////////////////////////////////////////////////////////////
// path search

static
char *
mkfilename(struct place *place, const char *dir, const char *file)
{
	size_t dlen, flen, rlen;
	char *ret;
	bool needslash = false;

	if (dir == NULL) {
		dir = place_getparsedir(place);
	}

	dlen = strlen(dir);
	flen = strlen(file);
	if (dlen > 0 && dir[dlen-1] != '/') {
		needslash = true;
	}

	rlen = dlen + (needslash ? 1 : 0) + flen;
	ret = domalloc(rlen + 1);
	strcpy(ret, dir);
	if (needslash) {
		strcat(ret, "/");
	}
	strcat(ret, file);
	return ret;
}

static
int
file_tryopen(const char *file)
{
	int fd;

	/* XXX check for non-regular files */

	fd = open(file, O_RDONLY);
	if (fd < 0) {
		if (errno != ENOENT && errno != ENOTDIR) {
			warn("%s", file);
		}
		return -1;
	}

	return fd;
}

static
void
file_search(struct place *place, struct incdirarray *path, const char *name)
{
	unsigned i, num;
	struct incdir *id;
	const struct placefile *pf;
	char *file;
	int fd;

	assert(place != NULL);

	if (name[0] == '/') {
		fd = file_tryopen(name);
		if (fd >= 0) {
			pf = place_addfile(place, name, true);
			file_read(pf, fd, name, false);
			close(fd);
			return;
		}
	} else {
		num = incdirarray_num(path);
		for (i=0; i<num; i++) {
			id = incdirarray_get(path, i);
			file = mkfilename(place, id->name, name);
			fd = file_tryopen(file);
			if (fd >= 0) {
				pf = place_addfile(place, file, id->issystem);
				file_read(pf, fd, file, false);
				dostrfree(file);
				close(fd);
				return;
			}
			dostrfree(file);
		}
	}
	complain(place, "Include file %s not found", name);
	complain_fail();
}

void
file_readquote(struct place *place, const char *name)
{
	file_search(place, &quotepath, name);
}

void
file_readbracket(struct place *place, const char *name)
{
	file_search(place, &bracketpath, name);
}

void
file_readabsolute(struct place *place, const char *name)
{
	const struct placefile *pf;
	int fd;

	assert(place != NULL);

	if (name == NULL) {
		fd = STDIN_FILENO;
		pf = place_addfile(place, "<standard-input>", false);
	} else {
		fd = file_tryopen(name);
		if (fd < 0) {
			warn("%s", name);
			die();
		}
		pf = place_addfile(place, name, false);
	}

	file_read(pf, fd, name, true);

	if (name != NULL) {
		close(fd);
	}
}