/*
* reverse -- display input in reverse order by line.
*
* There are six separate cases for this -- regular and non-regular
* files by bytes, lines or the whole file.
*
* BYTES display N bytes
* REG mmap the file and display the lines
* NOREG cyclically read characters into a wrap-around buffer
*
* LINES display N lines
* REG mmap the file and display the lines
* NOREG cyclically read lines into a wrap-around array of buffers
*
* FILE display the entire file
* REG mmap the file and display the lines
* NOREG cyclically read input into a linked list of buffers
*/
void
reverse(FILE *fp, enum STYLE style, off_t off, struct stat *sbp)
{
if (style != REVERSE && off == 0)
return;
if (S_ISREG(sbp->st_mode))
r_reg(fp, style, off, sbp);
else
switch(style) {
case FBYTES:
case RBYTES:
bytes(fp, off);
break;
case FLINES:
case RLINES:
lines(fp, off);
break;
case REVERSE:
r_buf(fp);
break;
default:
break;
}
}
/*
* reverse -- display input in reverse order by line.
*
* There are six separate cases for this -- regular and non-regular
* files by bytes, lines or the whole file.
*
* BYTES display N bytes
* REG reverse scan and display the lines
* NOREG cyclically read characters into a wrap-around buffer
*
* LINES display N lines
* REG reverse scan and display the lines
* NOREG cyclically read lines into a wrap-around array of buffers
*
* FILE display the entire file
* REG reverse scan and display the lines
* NOREG cyclically read input into a linked list of buffers
*/
void
reverse(FILE *fp, enum STYLE style, off_t off, struct stat *sbp)
{
if (style != REVERSE && off == 0)
return;
if (!S_ISREG(sbp->st_mode) || r_reg(fp, style, off, sbp) != 0)
switch(style) {
case FBYTES:
case RBYTES:
(void)bytes(fp, off);
break;
case FLINES:
case RLINES:
(void)lines(fp, off);
break;
case REVERSE:
r_buf(fp);
break;
}
}
