mirror of
https://gitlab.com/sortix/sortix.git
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118 lines
3.3 KiB
C++
118 lines
3.3 KiB
C++
/*******************************************************************************
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COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2012.
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This program is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the Free
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Software Foundation, either version 3 of the License, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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You should have received a copy of the GNU General Public License along with
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this program. If not, see <http://www.gnu.org/licenses/>.
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pager.cpp
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Displays files one page at a time.
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*******************************************************************************/
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#include <sys/keycodes.h>
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#include <sys/termmode.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <error.h>
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#include <termios.h>
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char* stdinargv[2];
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int main(int argc, char* argv[])
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{
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if ( isatty(0) && argc < 2 )
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{
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printf("usage: %s [FILE] ...\n", argv[0]);
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return 0;
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}
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if ( !isatty(0) && argc < 2 )
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{
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stdinargv[0] = argv[0];
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stdinargv[1] = (char*) "-";
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argv = stdinargv;
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argc = 2;
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}
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int stdinfd = dup(0);
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close(0);
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int ttyfd = open("/dev/tty", O_RDONLY);
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if ( ttyfd != 0 ) { perror("/dev/tty"); return 1; }
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struct winsize ws;
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if ( tcgetwinsize(0, &ws) )
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error(1, errno, "tcgetwinsize");
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const int HEIGHT = ws.ws_row;
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const int WIDTH = ws.ws_col;
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int linesleft = HEIGHT-1;
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int result = 0;
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size_t charleft = WIDTH;
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for ( int i = 1; i < argc; i++ )
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{
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int fd = ( strcmp(argv[i], "-") == 0 ) ? stdinfd : open(argv[i], O_RDONLY);
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if ( fd < 0 ) { result = 1; perror(argv[i]); continue; }
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const size_t BUFFER_SIZE = 4096;
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char buffer[BUFFER_SIZE];
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while ( true )
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{
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ssize_t numbytes = read(fd, buffer, BUFFER_SIZE);
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if ( !numbytes ) { break; }
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if ( numbytes < 0 )
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{
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result = 1;
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error(0, errno, "read: %s", argv[i]);
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break;
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}
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for ( ssize_t i = 0; i < numbytes; i++ )
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{
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char c = buffer[i];
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if ( c == '\n' ) { charleft = WIDTH; }
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bool eol = (c == '\n') || !charleft;
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if ( eol ) { charleft = WIDTH; }
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if ( eol && linesleft <= 1 )
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{
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printf("\n--pager--");
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fflush(stdout);
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settermmode(0, TERMMODE_KBKEY | TERMMODE_SIGNAL);
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bool doexit = false;
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int kbkey;
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do
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{
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uint32_t codepoint;
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ssize_t numbytes = read(0, &codepoint, sizeof(codepoint));
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if ( !numbytes ) { exit(0); }
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if ( numbytes < 0 ) { error(1, errno, "read(stdin)"); }
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if ( numbytes < (ssize_t) sizeof(codepoint) ) { error(1, errno, "bad stdin"); }
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if ( !(kbkey = KBKEY_DECODE(codepoint)) ) { continue; }
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if ( kbkey == KBKEY_DOWN ) { break; }
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if ( kbkey == KBKEY_PGDOWN ) { linesleft = HEIGHT-1; break; }
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if ( kbkey == -KBKEY_Q ) { doexit = true; break; }
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} while ( kbkey != KBKEY_ENTER );
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printf("\r\e[J");
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if ( doexit ) { exit(result); }
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continue;
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}
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if ( eol && linesleft ) { linesleft--; }
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printf("%c", c);
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charleft--;
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if ( c == '\t' ) { charleft &= ~(8-1); }
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}
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}
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if ( fd != stdinfd ) { close(fd); }
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}
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return result;
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}
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