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/* $OpenBSD: file.c,v 1.15 2019/01/31 01:30:46 tedu Exp $ */
/*-
* Copyright (c) 1999 James Howard and Dag-Erling Coïdan Smørgrav
* All rights reserved.
*
* 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 AUTHOR 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 AUTHOR 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 <sys/stat.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <zlib.h>
#include "grep.h"
static char fname[PATH_MAX];
static char *lnbuf;
static size_t lnbufsize;
#define FILE_STDIO 0
#define FILE_MMAP 1
#define FILE_GZIP 2
struct file {
int type;
int noseek;
FILE *f;
mmf_t *mmf;
gzFile *gzf;
};
#ifndef NOZ
static char *
gzfgetln(gzFile *f, size_t *len)
{
size_t n;
int c;
for (n = 0; ; ++n) {
c = gzgetc(f);
if (c == -1) {
const char *gzerrstr;
int gzerr;
if (gzeof(f))
break;
gzerrstr = gzerror(f, &gzerr);
if (gzerr == Z_ERRNO)
err(2, "%s", fname);
else
errx(2, "%s: %s", fname, gzerrstr);
}
if (n >= lnbufsize) {
lnbufsize *= 2;
lnbuf = grep_realloc(lnbuf, ++lnbufsize);
}
if (c == '\n')
break;
lnbuf[n] = c;
}
if (gzeof(f) && n == 0)
return NULL;
*len = n;
return lnbuf;
}
#endif
file_t *
grep_fdopen(int fd)
{
file_t *f;
struct stat sb;
if (fd == STDIN_FILENO)
snprintf(fname, sizeof fname, "(standard input)");
else if (fname[0] == '\0')
snprintf(fname, sizeof fname, "(fd %d)", fd);
if (fstat(fd, &sb) == -1)
return NULL;
if (S_ISDIR(sb.st_mode)) {
errno = EISDIR;
return NULL;
}
f = grep_malloc(sizeof *f);
#ifndef NOZ
if (Zflag) {
f->type = FILE_GZIP;
f->noseek = lseek(fd, 0L, SEEK_SET) == -1;
if ((f->gzf = gzdopen(fd, "r")) != NULL)
return f;
}
#endif
f->noseek = isatty(fd);
#ifndef SMALL
/* try mmap first; if it fails, try stdio */
if (!f->noseek && (f->mmf = mmopen(fd, &sb)) != NULL) {
f->type = FILE_MMAP;
return f;
}
#endif
f->type = FILE_STDIO;
if ((f->f = fdopen(fd, "r")) != NULL)
return f;
free(f);
return NULL;
}
file_t *
grep_open(char *path)
{
file_t *f;
int fd;
snprintf(fname, sizeof fname, "%s", path);
if ((fd = open(fname, O_RDONLY)) == -1)
return NULL;
f = grep_fdopen(fd);
if (f == NULL)
close(fd);
return f;
}
int
grep_bin_file(file_t *f)
{
if (f->noseek)
return 0;
switch (f->type) {
case FILE_STDIO:
return bin_file(f->f);
#ifndef SMALL
case FILE_MMAP:
return mmbin_file(f->mmf);
#endif
#ifndef NOZ
case FILE_GZIP:
return gzbin_file(f->gzf);
#endif
default:
/* can't happen */
errx(2, "invalid file type");
}
}
char *
grep_fgetln(file_t *f, size_t *l)
{
switch (f->type) {
case FILE_STDIO:
if ((*l = getline(&lnbuf, &lnbufsize, f->f)) == -1) {
if (ferror(f->f))
err(2, "%s: getline", fname);
else
return NULL;
}
return lnbuf;
#ifndef SMALL
case FILE_MMAP:
return mmfgetln(f->mmf, l);
#endif
#ifndef NOZ
case FILE_GZIP:
return gzfgetln(f->gzf, l);
#endif
default:
/* can't happen */
errx(2, "invalid file type");
}
}
void
grep_close(file_t *f)
{
switch (f->type) {
case FILE_STDIO:
fclose(f->f);
break;
#ifndef SMALL
case FILE_MMAP:
mmclose(f->mmf);
break;
#endif
#ifndef NOZ
case FILE_GZIP:
gzclose(f->gzf);
break;
#endif
default:
/* can't happen */
errx(2, "invalid file type");
}
free(f);
}
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