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/*
* Copyright (c) 2007-2009, 2013, 2015, 2019 Paul Mattes.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Paul Mattes nor his contributors may be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY PAUL MATTES "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 PAUL MATTES 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.
*/
/*
* catf.c
* A Windows console-based 3270 Terminal Emulator
* A subset of the Unix 'tail -f' command.
*/
#if !defined(_WIN32) /*[*/
#error For Windows only.
#endif /*]*/
#include <stdio.h>
#include "wincmn.h"
#include <sys/stat.h>
#include <fcntl.h>
#include <stdbool.h>
#define BUFFER_SIZE 16384
static int catf(char *filename, bool utf8);
int
main(int argc, char *argv[])
{
int argi = 1;
bool utf8 = false;
int rv;
if (argc > 1) {
if (!strcmp(argv[argi], "-utf8")) {
utf8 = true;
argi++;
}
}
if (argc - argi != 1) {
fprintf(stderr, "usage: catf [-utf8] <filename>\n");
exit(1);
}
if (utf8) {
/* Set the console to UTF-8 mode. */
SetConsoleOutputCP(65001);
}
do {
rv = catf(argv[argi], utf8);
} while (rv == 0);
exit(1);
}
/*
* Tail the file.
* Returns -1 for error, 0 for retry (file shrank or possibly disappeared).
*/
static int
catf(char *filename, bool utf8)
{
int fd;
struct stat buf;
off_t size;
off_t fp = 0;
char rbuf[BUFFER_SIZE];
wchar_t rbuf_w[BUFFER_SIZE];
fd = open(filename, O_RDONLY | O_BINARY);
if (fd < 0) {
perror(filename);
return -1;
}
if (fstat(fd, &buf) < 0) {
perror(filename);
return -1;
}
size = buf.st_size;
for (;;) {
while (fp < size) {
int n2r, nr;
BOOL udc;
if (size - fp > BUFFER_SIZE) {
n2r = BUFFER_SIZE;
} else {
n2r = size - fp;
}
nr = read(fd, rbuf, n2r);
if (nr < 0) {
perror(filename);
close(fd);
return 0;
}
if (nr == 0) {
printf("\nUNEXPECTED EOF\n");
close(fd);
return 0;
}
if (!utf8) {
/* Translate ANSI to OEM. */
MultiByteToWideChar(CP_ACP, 0, rbuf, nr, rbuf_w, BUFFER_SIZE);
WideCharToMultiByte(CP_OEMCP, 0, rbuf_w, BUFFER_SIZE, rbuf, nr,
"?", &udc);
}
write(1, rbuf, nr);
fp += nr;
}
do {
if (fstat(fd, &buf) < 0) {
perror(filename);
return -1;
}
if (buf.st_size < size) {
printf("\ncatf: '%s' shrank -- reopening\n", filename);
close(fd);
return 0;
}
if (buf.st_size == size) {
Sleep(1 * 1000);
}
} while (buf.st_size == size);
size = buf.st_size;
}
}
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