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/* more.c - View FILE (or stdin) one screenful at a time.
*
* Copyright 2013 Bilal Qureshi <bilal.jmi@gmail.com>
*
* No Standard
USE_MORE(NEWTOY(more, NULL, TOYFLAG_USR|TOYFLAG_BIN))
config MORE
bool "more"
default n
help
Usage: more [FILE]...
View FILE (or stdin) one screenful at a time.
*/
#define FOR_more
#include "toys.h"
#include <signal.h>
GLOBALS(
struct termios inf;
int cin_fd;
)
static void signal_handler(int sig)
{
tcsetattr(TT.cin_fd, TCSANOW, &TT.inf);
xputc('\n');
signal(sig, SIG_DFL);
raise(sig);
_exit(sig | 128);
}
static void do_cat_operation(int fd, char *name)
{
char *buf = NULL;
if(toys.optc > 1) printf(":::::::::::::::::::::::\n"
"%s\n:::::::::::::::::::::::\n",name);
for (; (buf = get_line(fd)); free(buf)) printf("%s\n", buf);
}
void more_main()
{
int ch, lines, input_key = 0, disp_more, more_msg_len;
unsigned rows = 24, cols = 80;
struct stat st;
struct termios newf;
FILE *fp, *cin;
if (!isatty(STDOUT_FILENO) || !(cin = fopen("/dev/tty", "r"))) {
loopfiles(toys.optargs, do_cat_operation);
toys.exitval = 0;
return;
}
TT.cin_fd = fileno(cin);
tcgetattr(TT.cin_fd,&TT.inf);
//Prepare terminal for input
memcpy(&newf, &TT.inf, sizeof(struct termios));
newf.c_lflag &= ~(ICANON | ECHO);
newf.c_cc[VMIN] = 1;
newf.c_cc[VTIME] = 0;
tcsetattr(TT.cin_fd, TCSANOW, &newf);
sigatexit(signal_handler);
do {
fp = stdin;
if (*toys.optargs && !(fp = fopen(*toys.optargs, "r"))) {
perror_msg("'%s'", *toys.optargs);
continue;
}
st.st_size = disp_more = more_msg_len = lines = 0;
fstat(fileno(fp), &st);
terminal_size(&cols, &rows);
rows--;
if(toys.optc > 1) {
printf(":::::::::::::::::::::::\n"
"%s\n:::::::::::::::::::::::\n",*toys.optargs);
rows -= 3;
}
while ((ch = getc(fp)) != EOF) {
if (input_key != 'r' && disp_more) {
more_msg_len = printf("--More-- ");
if (st.st_size)
more_msg_len += printf("(%d%% of %lld bytes)",
(int) (100 * ( (double) ftell(fp) / (double) st.st_size)),
st.st_size);
fflush(NULL);
while (1) {
input_key = getc(cin);
input_key = tolower(input_key);
printf("\r%*s\r", more_msg_len, ""); // Remove previous msg
if (input_key == ' ' || input_key == '\n' || input_key == 'q'
|| input_key == 'r') break;
more_msg_len = printf("(Enter:Next line Space:Next page Q:Quit R:Show the rest)");
}
more_msg_len = lines = disp_more = 0;
if (input_key == 'q') goto stop;
terminal_size(&cols, &rows);
rows--;
}
if (ch == '\n')
if (++lines >= rows || input_key == '\n') disp_more = 1;
putchar(ch);
}
fclose(fp);
fflush(NULL);
} while (*toys.optargs && *++toys.optargs);
stop:
tcsetattr(TT.cin_fd, TCSANOW, &TT.inf);
fclose(cin);
toys.exitval = 0;
}
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