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/* more - display files in a page-by-page basis.
* Copyright (C) 2022 Ferass EL HAFIDI
*
* 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 3 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, see <https://www.gnu.org/licenses/>.
*/
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <sys/ioctl.h>
#include "version.h"
#ifndef COMPILETIME
#define COMPILETIME
#endif
int getopt(int argc, char *const argv[], const char *optstring);
void printUsage();
int main(int argc, char *const argv[]) {
int i = 0, argument, success, read_file;
long int columns, lines;
char buffer[4096], cmd;
struct winsize w;
FILE *file;
struct termios oldattr, newattr;
ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
if (getenv("LINES")) lines = strtol(getenv("LINES"), NULL, 10) - 1;
else lines = w.ws_row - 1;
if (getenv("COLUMNS")) columns = strtol(getenv("COLUMNS"), NULL, 10);
else columns = w.ws_col - 1;
while ((argument = getopt(argc, argv, "")) != -1) {
if (argument == '?') {
printUsage();
return 1;
}
}
if (argc != 2) {
printUsage(); return 1;
}
file = fopen(argv[1], "r");
if (errno) return errno;
success = 0;
while (!success) {
if (!read_file) read_file = 1; /* 1 => read on a page-by-page basis
* 0 => don't read at all
* 2 => read on a line-by-line basis
*/
for (i = 0; i < lines && read_file != 0; i++) {
if (fgets(buffer, 4096, file) != NULL) {
printf("%s", buffer);
}
else if (errno) return errno;
else {
success = 1;
break;
} /* EOF, end while and for loop */
if (read_file == 2) {
break;
}
}
read_file = 0;
/* Get a character */
tcgetattr(0, &oldattr); /* Get previous terminal parameters */
newattr = oldattr;
newattr.c_lflag &= ~( ICANON | ECHO ); /* Disable ECHO and ICANON */
tcsetattr( 0, TCSANOW, &newattr); /* Set net parameters */
cmd = getchar();
tcsetattr(0, TCSANOW, &oldattr); /* Restore old parameters */
if (errno) return errno;
switch (cmd) {
case 'q':
return 0;
case 'h':
printUsage();
read_file = 0;
break;
case ' ':
read_file = 1; /* page-by-page */
break;
default:
read_file = 2; /* line-by-line */
break;
}
}
return 0;
}
void printUsage() {
printf("Ferass' Base System. (%s)\n\n"
"Usage: more file ...\n\n"
"Display a file on a page-by-page basis.\n\n", COMPILETIME);
}
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