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sortix--sortix/utils/pager.cpp
Jonas 'Sortie' Termansen c4264d9c2a Ported the user-space programs to use stdin for keyboard access.
The old keyboard API is hereby deprecated and unused.
2012-02-10 13:46:26 +01:00

74 lines
2 KiB
C++

#include <sys/keycodes.h>
#include <sys/termmode.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <error.h>
int main(int argc, char* argv[])
{
if ( argc < 2 ) { printf("usage: %s [FILE] ...\n", argv[0]); return 0; }
const int HEIGHT = 25;
const int WIDTH = 80;
int linesleft = HEIGHT-1;
int result = 0;
size_t charleft = WIDTH;
for ( int i = 1; i < argc; i++ )
{
int fd = ( strcmp(argv[i], "-") == 0 ) ? 0 : open(argv[i], O_RDONLY);
if ( fd < 0 ) { result = 1; perror(argv[i]); continue; }
const size_t BUFFER_SIZE = 4096;
char buffer[BUFFER_SIZE];
while ( true )
{
ssize_t numbytes = read(fd, buffer, BUFFER_SIZE);
if ( !numbytes ) { break; }
if ( numbytes < 0 )
{
result = 1;
error(0, errno, "read: %s", argv[i]);
break;
}
for ( ssize_t i = 0; i < numbytes; i++ )
{
bool printed = false;
char c = buffer[i];
if ( c == '\n' ) { charleft = WIDTH; }
bool eol = (c == '\n') || !charleft;
if ( eol ) { charleft = WIDTH; }
if ( eol && !linesleft )
{
printf("\n--pager--");
fflush(stdout);
settermmode(0, TERMMODE_KBKEY | TERMMODE_SIGNAL);
bool doexit = false;
int kbkey;
do
{
uint32_t codepoint;
ssize_t numbytes = read(0, &codepoint, sizeof(codepoint));
if ( !numbytes ) { exit(0); }
if ( numbytes < 0 ) { error(1, errno, "read(stdin)"); }
if ( numbytes < sizeof(codepoint) ) { error(1, errno, "bad stdin"); }
if ( !(kbkey = KBKEY_DECODE(codepoint)) ) { continue; }
if ( kbkey == KBKEY_DOWN ) { break; }
if ( kbkey == KBKEY_PGDOWN ) { linesleft = HEIGHT-1; break; }
if ( kbkey == -KBKEY_Q ) { doexit = true; break; }
} while ( kbkey != KBKEY_ENTER );
printf("\r\e[J");
if ( doexit ) { exit(result); }
continue;
}
if ( eol && linesleft ) { linesleft--; }
printf("%c", c);
charleft--;
if ( c == '\t' ) { charleft &= ~(4-1); }
}
}
if ( fd != 0 ) { close(fd); }
}
return result;
}