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/* more.c - View FILE (or stdin) one screenfull at a time.
*
* Copyright 2013 Bilal Qureshi <bilal.jmi@gmail.com>
*
* http://pubs.opengroup.org/onlinepubs/9699919799/utilities/more.html
USE_MORE(NEWTOY(more, 0, TOYFLAG_USR|TOYFLAG_BIN))
config MORE
bool "more"
default n
help
usage: more [FILE...]
View FILE(s) (or stdin) one screenfull at a time.
*/
#define FOR_more
#include "toys.h"
GLOBALS(
struct termios inf;
int cin_fd;
)
static void signal_handler(int sig)
{
// Reset the terminal whether we were signalled or exited normally.
tcsetattr(TT.cin_fd, TCSANOW, &TT.inf);
// If we were actually signalled, move to a new line and re-raise the signal.
if (sig != 0) {
xputc('\n');
signal(sig, SIG_DFL);
raise(sig);
_exit(sig | 128);
}
}
static void show_file_header(const char *name)
{
printf(":::::::::::::::::::::::\n%s\n:::::::::::::::::::::::\n", name);
}
static int prompt(FILE *cin, const char* fmt, ...)
{
int input_key;
va_list ap;
printf("\33[7m"); // Reverse video before printing the prompt.
va_start(ap, fmt);
vfprintf(stdout, fmt, ap);
va_end(ap);
while (1) {
fflush(NULL);
input_key = tolower(getc(cin));
printf("\33[0m\33[1K\r"); // Reset all attributes, erase to start of line.
if (strchr(" \nrq", input_key)) {
fflush(NULL);
return input_key;
}
printf("\33[7m(Enter:Next line Space:Next page Q:Quit R:Show the rest)");
}
}
static void do_cat_operation(int fd, char *name)
{
if (toys.optc > 1) show_file_header(name);
xsendfile(fd, 1);
}
void more_main()
{
int ch, input_key = 0, show_prompt;
unsigned rows = 24, cols = 80, row = 0, col = 0;
struct stat st;
struct termios newf;
FILE *fp, *cin;
if (!isatty(1) || !(cin = fopen("/dev/tty", "r"))) {
loopfiles(toys.optargs, do_cat_operation);
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);
goto next_file;
}
st.st_size = show_prompt = col = row = 0;
fstat(fileno(fp), &st);
terminal_size(&cols, &rows);
rows--;
if (toys.optc > 1) {
show_file_header(*toys.optargs);
row += 3;
}
while ((ch = getc(fp)) != EOF) {
if (input_key != 'r' && show_prompt) {
if (st.st_size)
input_key = prompt(cin, "--More--(%d%% of %lld bytes)",
(int) (100 * ( (double) ftell(fp) / (double) st.st_size)),
(long long)st.st_size);
else
input_key = prompt(cin, "--More--");
if (input_key == 'q') goto stop;
col = row = show_prompt = 0;
terminal_size(&cols, &rows);
rows--;
}
putchar(ch);
if (ch == '\t') col = (col | 0x7) + 1;
else col++;
if (col == cols) putchar(ch = '\n');
if (ch == '\n') {
col = 0;
if (++row >= rows || input_key == '\n') show_prompt = 1;
}
}
fclose(fp);
next_file:
if (*toys.optargs && *++toys.optargs) {
input_key = prompt(cin, "--More--(Next file: %s)", *toys.optargs);
if (input_key == 'q') goto stop;
}
} while (*toys.optargs);
stop:
tcsetattr(TT.cin_fd, TCSANOW, &TT.inf);
fclose(cin);
// Even if optarg not found, exit value still 0
toys.exitval = 0;
}
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