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https://git.FreeBSD.org/src.git
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388 lines
7.6 KiB
C
388 lines
7.6 KiB
C
/*
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* Copyright (C) 1994, David Greenman. This software may be used, modified,
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* copied, distributed, and sold, in both source and binary form provided
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* that the above copyright and these terms are retained. Under no
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* circumstances is the author responsible for the proper functioning
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* of this software, nor does the author assume any responsibility
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* for damages incurred with its use.
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*
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/ioctl.h>
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#include <sys/tty.h>
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#include <sys/clist.h>
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#include <sys/malloc.h>
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char cwaiting;
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struct cblock *cfreelist = 0;
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int cfreecount, nclist = 256;
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void
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clist_init()
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{
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int i;
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struct cblock *tmp;
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for (i = 0; i < nclist; ++i) {
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tmp = malloc(sizeof(struct cblock), M_TTYS, M_NOWAIT);
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if (!tmp)
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panic("clist_init: could not allocate cblock");
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bzero((char *)tmp, sizeof(struct cblock));
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tmp->c_next = cfreelist;
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cfreelist = tmp;
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cfreecount += CBSIZE;
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}
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return;
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}
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/*
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* Get a character from head of clist.
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*/
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int
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getc(clistp)
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struct clist *clistp;
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{
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int chr = -1;
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int s;
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struct cblock *cblockp;
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s = spltty();
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/* If there are characters in the list, get one */
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if (clistp->c_cc) {
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cblockp = (struct cblock *)((long)clistp->c_cf & ~CROUND);
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chr = (u_char)*clistp->c_cf;
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#if 0
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/*
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* If this char is quoted, set the flag.
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*/
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if (isset(cblockp->c_quote, clistp->c_cf - (char *)cblockp->c_info))
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chr |= TTY_QUOTE;
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#endif
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clistp->c_cf++;
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clistp->c_cc--;
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if ((clistp->c_cf >= (char *)(cblockp+1)) || (clistp->c_cc == 0)) {
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if (clistp->c_cc > 0) {
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clistp->c_cf = cblockp->c_next->c_info;
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} else {
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clistp->c_cf = clistp->c_cl = NULL;
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}
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cblockp->c_next = cfreelist;
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cfreelist = cblockp;
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cfreecount += CBSIZE;
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}
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}
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splx(s);
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return (chr);
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}
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/*
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* Copy 'amount' of chars, beginning at head of clist 'clistp' to
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* destination linear buffer 'dest'.
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*/
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int
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q_to_b(clistp, dest, amount)
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struct clist *clistp;
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char *dest;
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int amount;
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{
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struct cblock *cblockp;
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struct cblock *cblockn;
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char *dest_orig = dest;
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int numc;
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int s;
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s = spltty();
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while (clistp && amount && (clistp->c_cc > 0)) {
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cblockp = (struct cblock *)((long)clistp->c_cf & ~CROUND);
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cblockn = cblockp + 1; /* pointer arithmetic! */
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numc = min(amount, (char *)cblockn - clistp->c_cf);
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numc = min(numc, clistp->c_cc);
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bcopy(clistp->c_cf, dest, numc);
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amount -= numc;
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clistp->c_cf += numc;
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clistp->c_cc -= numc;
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dest += numc;
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if ((clistp->c_cf >= (char *)cblockn) || (clistp->c_cc == 0)) {
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if (clistp->c_cc > 0) {
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clistp->c_cf = cblockp->c_next->c_info;
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} else {
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clistp->c_cf = clistp->c_cl = NULL;
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}
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cblockp->c_next = cfreelist;
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cfreelist = cblockp;
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cfreecount += CBSIZE;
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}
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}
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splx(s);
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return (dest - dest_orig);
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}
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/*
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* Flush 'amount' of chars, beginning at head of clist 'clistp'.
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*/
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void
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ndflush(clistp, amount)
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struct clist *clistp;
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int amount;
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{
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struct cblock *cblockp;
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struct cblock *cblockn;
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int numc;
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int s;
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s = spltty();
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while (amount && (clistp->c_cc > 0)) {
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cblockp = (struct cblock *)((long)clistp->c_cf & ~CROUND);
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cblockn = cblockp + 1; /* pointer arithmetic! */
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numc = min(amount, (char *)cblockn - clistp->c_cf);
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numc = min(numc, clistp->c_cc);
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amount -= numc;
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clistp->c_cf += numc;
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clistp->c_cc -= numc;
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if ((clistp->c_cf >= (char *)cblockn) || (clistp->c_cc == 0)) {
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if (clistp->c_cc > 0) {
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clistp->c_cf = cblockp->c_next->c_info;
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} else {
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clistp->c_cf = clistp->c_cl = NULL;
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}
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cblockp->c_next = cfreelist;
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cfreelist = cblockp;
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cfreecount += CBSIZE;
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}
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}
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splx(s);
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return;
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}
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int
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putc(chr, clistp)
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int chr;
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struct clist *clistp;
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{
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struct cblock *cblockp;
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struct cblock *bclockn;
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int s;
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s = spltty();
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cblockp = (struct cblock *)((long)clistp->c_cl & ~CROUND);
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if (clistp->c_cl == NULL) {
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if (cfreelist) {
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cblockp = cfreelist;
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cfreelist = cfreelist->c_next;
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cfreecount -= CBSIZE;
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cblockp->c_next = NULL;
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clistp->c_cf = clistp->c_cl = cblockp->c_info;
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clistp->c_cc = 0;
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} else {
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splx(s);
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return (-1);
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}
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} else {
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if (((long)clistp->c_cl & CROUND) == 0) {
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if (cfreelist) {
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cblockp = (cblockp-1)->c_next = cfreelist;
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cfreelist = cfreelist->c_next;
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cfreecount -= CBSIZE;
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cblockp->c_next = NULL;
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clistp->c_cl = cblockp->c_info;
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} else {
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splx(s);
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return (-1);
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}
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}
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}
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#if 0
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if (chr & TTY_QUOTE)
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setbit(cblockp->c_quote, clistp->c_cl - (char *)cblockp->c_info);
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#endif
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*clistp->c_cl++ = chr;
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clistp->c_cc++;
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splx(s);
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return (0);
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}
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/*
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* Copy data from linear buffer to clist chain.
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*/
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int
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b_to_q(src, amount, clistp)
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char *src;
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int amount;
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struct clist *clistp;
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{
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struct cblock *cblockp;
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struct cblock *bclockn;
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int s;
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int numc;
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s = spltty();
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/*
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* If there are no cblocks assigned to this clist yet,
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* then get one.
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*/
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if (clistp->c_cl == NULL) {
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if (cfreelist) {
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cblockp = cfreelist;
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cfreelist = cfreelist->c_next;
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cfreecount -= CBSIZE;
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cblockp->c_next = NULL;
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clistp->c_cf = clistp->c_cl = cblockp->c_info;
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clistp->c_cc = 0;
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} else {
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splx(s);
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return (amount);
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}
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} else {
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cblockp = (struct cblock *)((long)clistp->c_cl & ~CROUND);
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}
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while (amount) {
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/*
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* Get another cblock if needed.
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*/
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if (((long)clistp->c_cl & CROUND) == 0) {
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if (cfreelist) {
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cblockp = (cblockp-1)->c_next = cfreelist;
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cfreelist = cfreelist->c_next;
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cfreecount -= CBSIZE;
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cblockp->c_next = NULL;
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clistp->c_cl = cblockp->c_info;
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} else {
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splx(s);
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return (amount);
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}
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}
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/*
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* Copy a chunk of the linear buffer up to the end
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* of this cblock.
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*/
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cblockp += 1;
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numc = min(amount, (char *)(cblockp) - clistp->c_cl);
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bcopy(src, clistp->c_cl, numc);
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/*
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* Clear quote bits.
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*/
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/*
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* ...and update pointer for the next chunk.
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*/
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src += numc;
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clistp->c_cl += numc;
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clistp->c_cc += numc;
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amount -= numc;
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}
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splx(s);
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return (amount);
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}
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char *
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nextc(clistp, cp, dst)
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struct clist *clistp;
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char *cp;
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int *dst;
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{
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struct cblock *cblockp;
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++cp;
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if (clistp->c_cc && (cp != clistp->c_cl)) {
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if (((long)cp & CROUND) == 0)
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cp = ((struct cblock *)cp - 1)->c_next->c_info;
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cblockp = (struct cblock *)((long)cp & ~CROUND);
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#if 0
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*dst = *cp | (isset(cblockp->c_quote, cp - (char *)cblockp->c_info) ? TTY_QUOTE : 0);
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#endif
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*dst = (u_char)*cp;
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return (cp);
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}
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return (NULL);
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}
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int
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unputc(clistp)
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struct clist *clistp;
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{
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struct cblock *cblockp = 0, *cbp = 0;
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int s;
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int chr = -1;
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s = spltty();
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if (clistp->c_cc) {
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--clistp->c_cc;
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chr = (u_char)*--clistp->c_cl;
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/*
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* Get the quote flag and 'unput' it, too.
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*/
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/* XXX write me! */
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cblockp = (struct cblock *)((long)clistp->c_cl & ~CROUND);
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/*
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* If all of the characters have been unput in this
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* cblock, the find the previous one and free this
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* one.
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*/
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if (clistp->c_cc && (clistp->c_cl <= (char *)cblockp->c_info)) {
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cbp = (struct cblock *)((long)clistp->c_cf & ~CROUND);
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while (cbp->c_next != cblockp)
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cbp = cbp->c_next;
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clistp->c_cl = (char *)(cbp+1);
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cblockp->c_next = cfreelist;
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cfreelist = cblockp;
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cfreecount += CBSIZE;
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cbp->c_next = NULL;
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}
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}
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/*
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* If there are no more characters on the list, then
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* free the last cblock.
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*/
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if ((clistp->c_cc == 0) && clistp->c_cl) {
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cblockp = (struct cblock *)((long)clistp->c_cl & ~CROUND);
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cblockp->c_next = cfreelist;
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cfreelist = cblockp;
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cfreecount += CBSIZE;
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clistp->c_cf = clistp->c_cl = NULL;
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}
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splx(s);
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return (chr);
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}
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void
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catq(src_clistp, dest_clistp)
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struct clist *src_clistp, *dest_clistp;
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{
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char buffer[CBSIZE*2];
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int amount;
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while (src_clistp->c_cc) {
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amount = q_to_b(src_clistp, buffer, sizeof(buffer));
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b_to_q(buffer, amount, dest_clistp);
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}
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return;
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}
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