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/*
* dos2unix for BusyBox
*
* dos2unix '\n' convertor 0.5.0
* based on Unix2Dos 0.9.0 by Peter Hanecak (made 19.2.1997)
* Copyright 1997,.. by Peter Hanecak <hanecak@megaloman.sk>.
* All rights reserved.
*
* dos2unix filters reading input from stdin and writing output to stdout.
* Without arguments it reverts the format (e.i. if source is in UNIX format,
* output is in DOS format and vice versa).
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* See the COPYING file for license information.
*/
#include <string.h>
#include <unistd.h>
#include <stdint.h>
#include <fcntl.h>
#include <sys/time.h>
#include "busybox.h"
#define CT_UNIX2DOS 1
#define CT_DOS2UNIX 2
/* We are making a lame pseudo-random string generator here. in
* convert(), each pass through the while loop will add more and more
* stuff into value, which is _supposed_ to wrap. We don't care about
* it being accurate. We care about it being messy, since we use it
* to pick a random letter to add to out temporary file. */
typedef unsigned long int bb_uint64_t;
#define tempFn bb_common_bufsiz1
/* if fn is NULL then input is stdin and output is stdout */
static int convert(char *fn, int ConvType)
{
int c, fd;
struct timeval tv;
static bb_uint64_t value=0;
FILE *in, *out;
if (fn != NULL) {
in = bb_xfopen(fn, "rw");
safe_strncpy(tempFn, fn, sizeof(tempFn));
c = strlen(tempFn);
tempFn[c] = '.';
while(1) {
/* tempFn is BUFSIZ so the last addressable spot it BUFSIZ-1.
* The loop increments by 2. So this must check for BUFSIZ-3. */
if (c >=BUFSIZ-3)
bb_error_msg_and_die("unique name not found");
/* Get some semi random stuff to try and make a
* random filename based (and in the same dir as)
* the input file... */
gettimeofday (&tv, NULL);
value += ((bb_uint64_t) tv.tv_usec << 16) ^ tv.tv_sec ^ getpid ();
tempFn[++c] = ((value%62) < 26)?(value%62)+97:
((value%62) < 52)?(value%62)+39:
(value%62)-4;
tempFn[c+1] = '\0';
value /= 62;
if ((fd = open(tempFn, O_RDWR | O_CREAT | O_EXCL, 0600)) < 0 ) {
continue;
}
out = fdopen(fd, "w+");
if (!out) {
close(fd);
remove(tempFn);
continue;
}
break;
}
} else {
in = stdin;
out = stdout;
}
while ((c = fgetc(in)) != EOF) {
if (c == '\r') {
if ((ConvType == CT_UNIX2DOS) && (fn != NULL)) {
/* file is already in DOS format so it is
* not necessary to touch it. */
remove(tempFn);
if (fclose(in) < 0 || fclose(out) < 0) {
bb_perror_nomsg();
return -2;
}
return 0;
}
break;
}
if (c == '\n') {
if ((ConvType == CT_DOS2UNIX) && (fn != NULL)) {
/* file is already in DOS format so it is
* not necessary to touch it. */
remove(tempFn);
if ((fclose(in) < 0) || (fclose(out) < 0)) {
bb_perror_nomsg();
return -2;
}
return 0;
}
if (ConvType == CT_UNIX2DOS) {
fputc('\r', out);
}
}
fputc(c, out);
}
while (c != EOF && (c = fgetc(in)) != EOF) {
if (c == '\r')
continue;
if (c == '\n') {
if (ConvType == CT_UNIX2DOS)
fputc('\r', out);
fputc('\n', out);
continue;
}
fputc(c, out);
}
if (fn != NULL) {
if (fclose(in) < 0 || fclose(out) < 0) {
bb_perror_nomsg();
remove(tempFn);
return -2;
}
/* Assume they are both on the same filesystem (which
* should be true since we put them into the same directory
* so we _should_ be ok, but you never know... */
if (rename(tempFn, fn) < 0) {
bb_perror_msg("unable to rename '%s' as '%s'", tempFn, fn);
return -1;
}
}
return 0;
}
int dos2unix_main(int argc, char *argv[])
{
int ConvType;
int o;
/* See if we are supposed to be doing dos2unix or unix2dos */
if (argv[0][0]=='d') {
ConvType = CT_DOS2UNIX;
} else {
ConvType = CT_UNIX2DOS;
}
/* process parameters */
o = bb_getopt_ulflags(argc, argv, "ud");
/* Do the conversion requested by an argument else do the default
* conversion depending on our name. */
if (o)
ConvType = o;
if (optind < argc) {
while(optind < argc)
if ((o = convert(argv[optind++], ConvType)) < 0)
break;
}
else
o = convert(NULL, ConvType);
return o;
}
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