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/* This file is part of GNU Dico.
Copyright (C) 1998-2023 Sergey Poznyakoff
GNU Dico 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 3, or (at your option)
any later version.
GNU Dico 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 GNU Dico. If not, see <http://www.gnu.org/licenses/>. */
#include "dico-priv.h"
#include <sys/ioctl.h>
static char *pager;
static char *
get_pager_name(void)
{
if (pager) {
if (strcmp(pager, "-") == 0)
return NULL;
return pager;
}
return getenv("PAGER");
}
void
ds_pager(int argc, char **argv)
{
if (argc == 1) {
char *p = get_pager_name();
if (p) {
printf("%s\n", p);
if (!pager)
printf("%s\n", _("(Pager set from environment)"));
}
} else
xdico_assign_string(&pager, argv[1]);
}
dico_stream_t
create_output_stream(void)
{
return dico_fd_stream_create(fileno(stdout), DICO_STREAM_WRITE, 1);
}
static int
get_screen_lines(void)
{
struct winsize ws;
ws.ws_col = ws.ws_row = 0;
if ((ioctl(1, TIOCGWINSZ, (char *) &ws) < 0) || ws.ws_row == 0) {
const char *lines = getenv("LINES");
if (lines)
ws.ws_row = strtol(lines, NULL, 10);
}
return ws.ws_row;
}
struct pfile_stream {
FILE *fp;
};
static int
fp_write(void *data, const char *buf, size_t size, size_t *pret)
{
struct pfile_stream *p = data;
*pret = fwrite(buf, 1, size, p->fp);
return ferror(p->fp);
}
static int
fp_close(void *data)
{
struct pfile_stream *p = data;
pclose(p->fp);
return 0;
}
static dico_stream_t
create_pfile_stream(FILE *fp)
{
dico_stream_t str;
struct pfile_stream *s;
s = xmalloc(sizeof(*s));
s->fp = fp;
if (dico_stream_create(&str, DICO_STREAM_WRITE, s))
xalloc_die();
dico_stream_set_write(str, fp_write);
dico_stream_set_close(str, fp_close);
return str;
}
dico_stream_t
create_pager_stream(size_t nlines)
{
char *pager = get_pager_name();
FILE *fp;
if (!pager || !pager[0]
|| !isatty(fileno(stdout)) || nlines < get_screen_lines())
return create_output_stream();
fp = popen(pager, "w");
if (!fp)
return create_output_stream();
return create_pfile_stream(fp);
}
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