723 lines
15 KiB
C
Executable File
723 lines
15 KiB
C
Executable File
/* Copyright (c) 1985 Ceriel J.H. Jacobs */
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# ifndef lint
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static char rcsid[] = "$Header$";
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# endif
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# define _GETLINE_
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# include <errno.h>
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# include "in_all.h"
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# include "getline.h"
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# include "options.h"
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# include "process.h"
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# include "term.h"
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# include "main.h"
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# include "display.h"
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# include "output.h"
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# include "assert.h"
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extern int errno;
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# define BLOCKSIZE 2048 /* size of blocks */
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# define CHUNK 50 /* # of blockheaders allocated at a time */
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/*
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* The blockheaders of the blocks that are in core are kept in a linked list.
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* The last added block is indicated by b_head,
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* the tail of the list is indicated by b_tail.
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* The links go from b_tail to b_head.
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* The blockheaders are all in an array, in the order of the line numbers.
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* Also, the blockheaders must always be in core, so they have to be rather
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* small. On systems with a small address space, yap can run out of core,
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* and panic. However, this should only happen with very large files (>> 1M).
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*/
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struct block {
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int b_flags; /* Contains the following flags: */
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# define DUMPED 01 /* block dumped on temporary file */
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# define PARTLY 02 /* block not filled completely (eof) */
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int b_next; /* ptr in linked list */
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long b_end; /* line number of last line in block */
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char * b_info; /* the block */
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int * b_offs; /* line offsets within the block */
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long b_foff; /* offset of block in file */
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};
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static struct block * blocklist, /* beginning of the list of blocks */
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* maxblocklist, /* first free entry in the list */
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* topblocklist; /* end of allocated core for the list */
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static int b_head,
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b_tail;
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static int tfdes, ifdes; /* File descriptors for temporary's */
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static long lastreadline; /* lineno of last line read */
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static int ENDseen;
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STATIC VOID readblock();
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STATIC VOID nextblock();
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STATIC char *re_alloc();
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STATIC struct block *
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new_block()
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{
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register struct block *pblock = maxblocklist - 1;
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if (!maxblocklist || !(pblock->b_flags & PARTLY)) {
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/*
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* There is no last block, or it was filled completely,
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* so allocate a new blockheader.
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*/
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register int siz;
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pblock = blocklist;
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if (maxblocklist == topblocklist) {
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/*
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* No blockheaders left. Allocate new ones
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*/
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siz = topblocklist - pblock;
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blocklist = pblock = (struct block *)
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re_alloc((char *) pblock,
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(unsigned) (siz * sizeof(*pblock)),
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(unsigned) ((siz + CHUNK) * sizeof(*pblock)));
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pblock += siz;
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topblocklist = pblock + CHUNK;
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maxblocklist = pblock;
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for (; pblock < topblocklist; pblock++) {
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pblock->b_end = 0;
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pblock->b_info = 0;
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pblock->b_flags = 0;
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}
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if (!siz) {
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/*
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* Create dummy header cell.
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*/
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maxblocklist++;
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}
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}
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pblock = maxblocklist++;
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}
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nextblock(pblock);
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return pblock;
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}
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/*
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* Return the block in which line 'n' of the current file can be found.
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* If "disable_interrupt" = 0, the call may be interrupted, in which
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* case it returns 0.
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*/
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STATIC struct block *
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getblock(n, disable_interrupt) register long n; {
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register struct block * pblock;
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if (stdf < 0) {
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/*
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* Not file descriptor, so return end of file
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*/
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return 0;
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}
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pblock = maxblocklist - 1;
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if (n < lastreadline ||
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(n == lastreadline && !(pblock->b_flags & PARTLY))) {
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/*
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* The line asked for has been read already.
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* Perform binary search in the blocklist to find the block
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* where it's in.
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*/
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register struct block *min, *mid;
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min = blocklist + 1;
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do {
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mid = min + (pblock - min) / 2;
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if (n > mid->b_end) {
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min = mid + 1;
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}
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else pblock = mid;
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} while (min < pblock);
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/* Found, pblock is now a reference to the block wanted */
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if (!pblock->b_info) readblock(pblock);
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return pblock;
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}
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/*
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* The line was'nt read yet, so read blocks until found
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*/
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for (;;) {
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if (interrupt && !disable_interrupt) return 0;
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pblock = new_block();
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if (pblock->b_end >= n) {
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return pblock;
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}
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if (pblock->b_flags & PARTLY) {
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/*
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* We did not find it, and the last block could not be
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* read completely, so return 0;
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*/
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return 0;
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}
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}
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/* NOTREACHED */
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}
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char *
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getline(n, disable_interrupt) long n; {
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register struct block *pblock;
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if (!(pblock = getblock(n, disable_interrupt))) {
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return (char *) 0;
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}
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return pblock->b_info + pblock->b_offs[n - ((pblock-1)->b_end + 1)];
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}
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/*
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* Find the last line of the input, and return its number
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*/
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long
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to_lastline() {
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for (;;) {
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if (!getline(lastreadline + 1, 0)) {
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/*
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* "lastreadline" always contains the linenumber of
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* the last line read. So, if the call to getline
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* succeeds, "lastreadline" is affected
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*/
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if (interrupt) return -1L;
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return lastreadline;
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}
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}
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/* NOTREACHED */
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}
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#if MAXNBLOCKS
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int nblocks; /* Count number of large blocks */
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#endif
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/*
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* Allocate some memory. If unavailable, free some and try again.
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* If all fails, panic.
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*/
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char *
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alloc(size, isblock) unsigned size; {
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register char *pmem;
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register struct block *pblock, *bllist;
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char *malloc();
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long lseek();
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register long i;
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bllist = blocklist;
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while (
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#if MAXNBLOCKS
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(isblock && nblocks >= MAXNBLOCKS) ||
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#endif
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!(pmem = malloc(size)) /* No space */
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) {
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if (b_tail == 0) {
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/*
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* Also, no blocks in core. Pity
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*/
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panic("No core");
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}
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#if MAXNBLOCKS
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nblocks--;
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#endif
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pblock = bllist + b_tail;
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b_tail = pblock->b_next;
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if (!nopipe && !(pblock->b_flags & DUMPED)) {
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/*
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* Dump the block on a temporary file
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*/
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if (!tfdes) {
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/*
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* create and open temporary files
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*/
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tfdes = opentemp(0);
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ifdes = opentemp(1);
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}
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pblock->b_flags |= DUMPED;
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/*
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* Find out where to dump the block, and dump it
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*/
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i = (pblock-1)->b_end * sizeof(int);
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(VOID) lseek(tfdes,
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((long) BLOCKSIZE * (pblock - bllist)), 0);
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if (write(tfdes, pblock->b_info, BLOCKSIZE)
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!= BLOCKSIZE) {
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panic("write failed");
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}
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/*
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* Also dump the offsets of the lines in the block
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*/
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(VOID) lseek(ifdes, i, 0);
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i = pblock->b_end * sizeof(int) - i;
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if (write(ifdes, (char *) pblock->b_offs, (int) i)
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!= (int) i) {
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panic("Write failed");
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}
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}
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/*
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* Now that the block is dumped, the space taken by it can
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* be freed
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*/
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free((char *) pblock->b_offs);
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free(pblock->b_info);
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pblock->b_info = (char *) 0;
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}
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#if MAXNBLOCKS
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if (isblock) nblocks++;
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#endif
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return pmem;
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}
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/*
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* Re-allocate the memorychunk pointed to by ptr, to let it
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* grow or shrink.
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* realloc of the standard C library is useless, as it is destructive
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* if the malloc fails.
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*/
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STATIC char *
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re_alloc(ptr,oldsize, newsize)
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char *ptr; unsigned oldsize; unsigned newsize; {
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register char *pmem;
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register char *c1, *c2;
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/*
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* We could be smarter here, by checking if newsize < oldsize, and in
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* that case using realloc, but this depends on realloc using the
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* same block if the block shrinks. The question is, wether all
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* reallocs in the world do this.
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*/
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pmem = alloc(newsize, 0);
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if (oldsize) {
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/*
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* This test makes re_alloc also work if there was no old block
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*/
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c1 = pmem;
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c2 = ptr;
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if (newsize > oldsize) {
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newsize = oldsize;
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}
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while (newsize--) {
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*c1++ = *c2++;
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}
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free(ptr);
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}
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return pmem;
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}
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/*
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* Append a block to the linked list of blockheaders of blocks that are
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* in core.
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*/
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STATIC VOID
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addtolist(pblock) register struct block *pblock; {
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register struct block *bllist = blocklist;
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pblock->b_next = 0;
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(bllist + b_head)->b_next = pblock - bllist;
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b_head = pblock - bllist;
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if (!b_tail) {
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/*
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* The list was empty, initialize
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*/
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b_tail = b_head;
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}
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}
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static char *saved;
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static long filldegree;
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/*
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* Try to read the block indicated by pblock
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*/
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STATIC VOID
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nextblock(pblock) register struct block *pblock; {
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register char *c, /* Run through pblock->b_info */
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*c1; /* indicate end of pblock->b_info */
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register int *poff; /* pointer in line-offset list */
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register int cnt; /* # of characters read */
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register unsigned siz; /* Size of allocated line-offset list */
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static unsigned savedsiz; /* saved "siz" */
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static int *savedpoff; /* saved "poff" */
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static char *savedc1; /* saved "c1" */
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if (pblock->b_flags & PARTLY) {
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/*
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* The block was already partly filled. Initialize locals
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* accordingly
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*/
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poff = savedpoff;
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siz = savedsiz;
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pblock->b_flags = 0;
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c1 = savedc1;
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if (c1 == pblock->b_info || *(c1 - 1)) {
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/*
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* We had incremented "lastreadline" temporarily,
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* because the last line could not be completely read
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* last time we tried. Undo this increment
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*/
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poff--;
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--lastreadline;
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}
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}
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else {
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if (nopipe) pblock->b_foff = lseek(stdf, 0L, 1);
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if (saved) {
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/*
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* There were leftovers from the previous block
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*/
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pblock->b_info = saved;
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if (nopipe) pblock->b_foff -= savedc1 - saved;
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c1 = savedc1;
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saved = 0;
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}
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else { /* Allocate new block */
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pblock->b_info = c1 = alloc(BLOCKSIZE + 1, 1);
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}
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/*
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* Allocate some space for line-offsets
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*/
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pblock->b_offs = poff = (int *)
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alloc((unsigned) (100 * sizeof(int)), 0);
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siz = 99;
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*poff++ = 0;
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}
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c = c1;
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for (;;) {
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/*
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* Read loop
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*/
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cnt = read(stdf, c1, BLOCKSIZE - (c1 - pblock->b_info));
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if (cnt < 0) {
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/*
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* Interrupted read
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*/
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if (errno == EINTR) continue;
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error("Could not read input file");
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cnt = 0;
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}
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c1 += cnt;
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if (c1 != pblock->b_info + BLOCKSIZE) {
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ENDseen = 1;
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pblock->b_flags |= PARTLY;
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}
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break;
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}
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assert(c <= c1);
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while (c < c1) {
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/*
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* Now process the block
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*/
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*c &= 0177; /* Most significant bit ignored */
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if (*c == '\n') {
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/*
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* Newlines are replaced by '\0', so that "getline"
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* can deliver one line at a time
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*/
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*c = 0;
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lastreadline++;
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/*
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* Remember the line-offset
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*/
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if (poff == pblock->b_offs + siz) {
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/*
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* No space for it, allocate some more
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*/
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pblock->b_offs = (int *)
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re_alloc((char *) pblock->b_offs,
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(siz+1) * sizeof(int),
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(siz + 51) * sizeof(int));
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poff = pblock->b_offs + siz;
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siz += 50;
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}
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*poff++ = c - pblock->b_info + 1;
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}
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else if (*c == '\0') {
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/*
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* 0-bytes are replaced by 0200, because newlines are
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* replaced by 0, and 0200 & 0177 gives again 0 ...
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*/
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*c = 0200;
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}
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c++;
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}
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assert(c==c1);
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*c = 0;
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if (c != pblock->b_info && *(c-1) != 0) {
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/*
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* The last line read does not end with a newline, so add one
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*/
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lastreadline++;
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*poff++ = c - pblock->b_info + 1;
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if (!(pblock->b_flags & PARTLY) && *(poff - 2) != 0) {
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/*
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* Save the started line; it will be in the next block.
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* Remove the newline we added just now.
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*/
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saved = c1 = alloc(BLOCKSIZE + 1, 1);
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c = pblock->b_info + *(--poff - 1);
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while (*c) *c1++ = *c++;
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c = pblock->b_info + *(poff - 1);
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savedc1 = c1;
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--lastreadline;
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}
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}
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pblock->b_end = lastreadline;
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if (pblock->b_flags & PARTLY) {
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/*
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* Take care, that we can call "nextblock" again, to fill in
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* the rest of this block
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*/
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savedsiz = siz;
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savedpoff = poff;
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savedc1 = c;
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if (c == pblock->b_info) {
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lastreadline++;
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pblock->b_end = 0;
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}
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}
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else {
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/*
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* Not completely read blocks are not in the linked list,
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* so can never be "swapped out".
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*/
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addtolist(pblock);
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cnt = pblock - blocklist;
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filldegree = ((c-pblock->b_info) + (cnt-1) * filldegree) / cnt;
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}
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assert(pblock->b_end - (pblock-1)->b_end <= poff - pblock->b_offs);
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}
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/*
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* Allocate core for the block, and read it back from
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* the temporary file.
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*/
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STATIC VOID
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readblock(pblock) register struct block *pblock; {
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register int size;
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register long i;
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/*
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* Find out where the block is, and read it
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*/
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pblock->b_info = alloc(BLOCKSIZE + 1, 1);
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i = (pblock - 1)->b_end * sizeof(int);
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size = (int) (pblock->b_end * sizeof(int) - i);
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pblock->b_offs = (int *) alloc((unsigned) size, 0);
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if (nopipe) {
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register char *c;
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register int line_index;
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int cnt;
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long l = lseek(stdf, 0L, 1);
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(VOID) lseek(stdf, pblock->b_foff, 0);
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cnt = read(stdf, pblock->b_info, BLOCKSIZE);
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(VOID) lseek(stdf, l, 0);
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c = pblock->b_info;
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pblock->b_offs[0] = 0;
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line_index = 1;
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size /= sizeof(int);
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while (c < pblock->b_info + cnt) {
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*c &= 0177;
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if (*c == '\n') {
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*c = '\0';
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if (line_index < size)
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pblock->b_offs[line_index++] =
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(c - pblock->b_info) + 1;
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}
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else if (*c == '\0') *c = 0200;
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c++;
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}
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*c = '\0';
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}
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else {
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(VOID) lseek(tfdes, (long) ((long) BLOCKSIZE * (pblock - blocklist)),0);
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if (read(tfdes, pblock->b_info,BLOCKSIZE) != BLOCKSIZE) {
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panic("read error");
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}
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/*
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* Find out where the line-offset list is, and read it
|
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*/
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(VOID) lseek(ifdes, i, 0);
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if (read(ifdes, (char *) pblock->b_offs, size) != size) {
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panic("read error");
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}
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pblock->b_info[BLOCKSIZE] = '\0';
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}
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/*
|
|
* Add this block to the list of incore blocks
|
|
*/
|
|
addtolist(pblock);
|
|
}
|
|
|
|
/*
|
|
* Called after processing a file.
|
|
* Free all core.
|
|
*/
|
|
|
|
VOID
|
|
do_clean() {
|
|
|
|
register struct block *pblock;
|
|
register char *p;
|
|
|
|
for (pblock = blocklist; pblock < maxblocklist; pblock++) {
|
|
if (p = pblock->b_info) {
|
|
free(p);
|
|
free((char *) pblock->b_offs);
|
|
}
|
|
}
|
|
if (p = (char *) blocklist) {
|
|
free(p);
|
|
}
|
|
blocklist = 0;
|
|
maxblocklist = 0;
|
|
topblocklist = 0;
|
|
lastreadline = 0;
|
|
filldegree = 0;
|
|
ENDseen = 0;
|
|
if (p = saved) free(p);
|
|
saved = 0;
|
|
b_head = 0;
|
|
b_tail = 0;
|
|
# if MAXNBLOCKS
|
|
nblocks = 0;
|
|
# endif
|
|
}
|
|
|
|
/*
|
|
* Close a file with file-descriptor "file", if it indeed is one
|
|
*/
|
|
|
|
STATIC VOID
|
|
cls(file) {
|
|
if (file) (VOID) close(file);
|
|
}
|
|
|
|
/*
|
|
* Close all files
|
|
*/
|
|
|
|
VOID
|
|
cls_files() {
|
|
|
|
cls(tfdes);
|
|
cls(ifdes);
|
|
cls(stdf);
|
|
}
|
|
|
|
/*
|
|
* Get a character. If possible, do some workahead.
|
|
*/
|
|
|
|
int
|
|
getch() {
|
|
# if USG_OPEN
|
|
# include <fcntl.h>
|
|
# include <sys/stat.h>
|
|
|
|
register int i,j;
|
|
struct stat buf;
|
|
# else
|
|
# ifdef FIONREAD
|
|
# include <sys/stat.h>
|
|
|
|
struct stat buf;
|
|
long i;
|
|
# endif
|
|
# endif
|
|
|
|
char c;
|
|
int retval;
|
|
|
|
flush();
|
|
if (startcomm) {
|
|
/*
|
|
* Command line option command
|
|
*/
|
|
if (*startcomm) return *startcomm++;
|
|
return '\n';
|
|
}
|
|
# if USG_OPEN
|
|
if (stdf >= 0) {
|
|
/*
|
|
* Make reads from the terminal non-blocking, so that
|
|
* we can see if the user typed something
|
|
*/
|
|
i = fcntl(0,F_GETFL,0);
|
|
if (i != -1 && fcntl(0, F_SETFL, i|O_NDELAY) != -1) {
|
|
j = 0;
|
|
while (! ENDseen &&
|
|
((j = read(0,&c,1)) == 0
|
|
#ifdef EWOULDBLOCK
|
|
|| (j < 0 && errno == EWOULDBLOCK)
|
|
#endif
|
|
)
|
|
&&
|
|
(nopipe ||
|
|
(fstat(stdf,&buf) >= 0 && buf.st_size > 0))) {
|
|
/*
|
|
* Do some read ahead, after making sure there
|
|
* is input and the user did not type a command
|
|
*/
|
|
new_block();
|
|
}
|
|
(VOID) fcntl(0,F_SETFL,i);
|
|
if (j < 0) {
|
|
/*
|
|
* Could this have happened?
|
|
* I'm not sure, because the read is
|
|
* nonblocking. Can it be interrupted then?
|
|
*/
|
|
return -1;
|
|
}
|
|
if (j > 0) return c;
|
|
}
|
|
}
|
|
# else
|
|
# ifdef FIONREAD
|
|
if (stdf >= 0) {
|
|
/*
|
|
* See if there are any characters waiting in the terminal input
|
|
* queue. If there are not, read ahead.
|
|
*/
|
|
while (! ENDseen &&
|
|
( ioctl(0, FIONREAD, (char *) &i) >= 0 && i == 0) &&
|
|
( nopipe || fstat(stdf,&buf) >= 0 && buf.st_size > 0)) {
|
|
/*
|
|
* While the user does'nt type anything, and there is
|
|
* input to be processed, work ahead
|
|
*/
|
|
if (interrupt) return -1;
|
|
new_block();
|
|
}
|
|
}
|
|
# endif
|
|
# endif
|
|
if (read(0,&c,1) <= 0) retval = -1; else retval = c & 0177;
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* Get the position of line "ln" in the file.
|
|
*/
|
|
|
|
long
|
|
getpos(ln) long ln; {
|
|
register struct block *pblock;
|
|
register long i;
|
|
|
|
pblock = getblock(ln,1);
|
|
assert(pblock != 0);
|
|
i = filldegree * (pblock - blocklist);
|
|
return i - (filldegree - pblock->b_offs[ln - (pblock-1)->b_end]);
|
|
}
|