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Diffstat (limited to 'contrib/nvi/common/put.c')
| -rw-r--r-- | contrib/nvi/common/put.c | 231 |
1 files changed, 231 insertions, 0 deletions
diff --git a/contrib/nvi/common/put.c b/contrib/nvi/common/put.c new file mode 100644 index 0000000..8c0ca4b --- /dev/null +++ b/contrib/nvi/common/put.c @@ -0,0 +1,231 @@ +/*- + * Copyright (c) 1992, 1993, 1994 + * The Regents of the University of California. All rights reserved. + * Copyright (c) 1992, 1993, 1994, 1995, 1996 + * Keith Bostic. All rights reserved. + * + * See the LICENSE file for redistribution information. + */ + +#include "config.h" + +#ifndef lint +static const char sccsid[] = "@(#)put.c 10.11 (Berkeley) 9/23/96"; +#endif /* not lint */ + +#include <sys/types.h> +#include <sys/queue.h> + +#include <bitstring.h> +#include <ctype.h> +#include <limits.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include "common.h" + +/* + * put -- + * Put text buffer contents into the file. + * + * PUBLIC: int put __P((SCR *, CB *, CHAR_T *, MARK *, MARK *, int)); + */ +int +put(sp, cbp, namep, cp, rp, append) + SCR *sp; + CB *cbp; + CHAR_T *namep; + MARK *cp, *rp; + int append; +{ + CHAR_T name; + TEXT *ltp, *tp; + recno_t lno; + size_t blen, clen, len; + int rval; + char *bp, *p, *t; + + if (cbp == NULL) + if (namep == NULL) { + cbp = sp->gp->dcbp; + if (cbp == NULL) { + msgq(sp, M_ERR, + "053|The default buffer is empty"); + return (1); + } + } else { + name = *namep; + CBNAME(sp, cbp, name); + if (cbp == NULL) { + msgq(sp, M_ERR, "054|Buffer %s is empty", + KEY_NAME(sp, name)); + return (1); + } + } + tp = cbp->textq.cqh_first; + + /* + * It's possible to do a put into an empty file, meaning that the cut + * buffer simply becomes the file. It's a special case so that we can + * ignore it in general. + * + * !!! + * Historically, pasting into a file with no lines in vi would preserve + * the single blank line. This is surely a result of the fact that the + * historic vi couldn't deal with a file that had no lines in it. This + * implementation treats that as a bug, and does not retain the blank + * line. + * + * Historical practice is that the cursor ends at the first character + * in the file. + */ + if (cp->lno == 1) { + if (db_last(sp, &lno)) + return (1); + if (lno == 0) { + for (; tp != (void *)&cbp->textq; + ++lno, ++sp->rptlines[L_ADDED], tp = tp->q.cqe_next) + if (db_append(sp, 1, lno, tp->lb, tp->len)) + return (1); + rp->lno = 1; + rp->cno = 0; + return (0); + } + } + + /* If a line mode buffer, append each new line into the file. */ + if (F_ISSET(cbp, CB_LMODE)) { + lno = append ? cp->lno : cp->lno - 1; + rp->lno = lno + 1; + for (; tp != (void *)&cbp->textq; + ++lno, ++sp->rptlines[L_ADDED], tp = tp->q.cqe_next) + if (db_append(sp, 1, lno, tp->lb, tp->len)) + return (1); + rp->cno = 0; + (void)nonblank(sp, rp->lno, &rp->cno); + return (0); + } + + /* + * If buffer was cut in character mode, replace the current line with + * one built from the portion of the first line to the left of the + * split plus the first line in the CB. Append each intermediate line + * in the CB. Append a line built from the portion of the first line + * to the right of the split plus the last line in the CB. + * + * Get the first line. + */ + lno = cp->lno; + if (db_get(sp, lno, DBG_FATAL, &p, &len)) + return (1); + + GET_SPACE_RET(sp, bp, blen, tp->len + len + 1); + t = bp; + + /* Original line, left of the split. */ + if (len > 0 && (clen = cp->cno + (append ? 1 : 0)) > 0) { + memcpy(bp, p, clen); + p += clen; + t += clen; + } + + /* First line from the CB. */ + if (tp->len != 0) { + memcpy(t, tp->lb, tp->len); + t += tp->len; + } + + /* Calculate length left in the original line. */ + clen = len == 0 ? 0 : len - (cp->cno + (append ? 1 : 0)); + + /* + * !!! + * In the historical 4BSD version of vi, character mode puts within + * a single line have two cursor behaviors: if the put is from the + * unnamed buffer, the cursor moves to the character inserted which + * appears last in the file. If the put is from a named buffer, + * the cursor moves to the character inserted which appears first + * in the file. In System III/V, it was changed at some point and + * the cursor always moves to the first character. In both versions + * of vi, character mode puts that cross line boundaries leave the + * cursor on the first character. Nvi implements the System III/V + * behavior, and expect POSIX.2 to do so as well. + */ + rp->lno = lno; + rp->cno = len == 0 ? 0 : sp->cno + (append && tp->len ? 1 : 0); + + /* + * If no more lines in the CB, append the rest of the original + * line and quit. Otherwise, build the last line before doing + * the intermediate lines, because the line changes will lose + * the cached line. + */ + if (tp->q.cqe_next == (void *)&cbp->textq) { + if (clen > 0) { + memcpy(t, p, clen); + t += clen; + } + if (db_set(sp, lno, bp, t - bp)) + goto err; + if (sp->rptlchange != lno) { + sp->rptlchange = lno; + ++sp->rptlines[L_CHANGED]; + } + } else { + /* + * Have to build both the first and last lines of the + * put before doing any sets or we'll lose the cached + * line. Build both the first and last lines in the + * same buffer, so we don't have to have another buffer + * floating around. + * + * Last part of original line; check for space, reset + * the pointer into the buffer. + */ + ltp = cbp->textq.cqh_last; + len = t - bp; + ADD_SPACE_RET(sp, bp, blen, ltp->len + clen); + t = bp + len; + + /* Add in last part of the CB. */ + memcpy(t, ltp->lb, ltp->len); + if (clen) + memcpy(t + ltp->len, p, clen); + clen += ltp->len; + + /* + * Now: bp points to the first character of the first + * line, t points to the last character of the last + * line, t - bp is the length of the first line, and + * clen is the length of the last. Just figured you'd + * want to know. + * + * Output the line replacing the original line. + */ + if (db_set(sp, lno, bp, t - bp)) + goto err; + if (sp->rptlchange != lno) { + sp->rptlchange = lno; + ++sp->rptlines[L_CHANGED]; + } + + /* Output any intermediate lines in the CB. */ + for (tp = tp->q.cqe_next; + tp->q.cqe_next != (void *)&cbp->textq; + ++lno, ++sp->rptlines[L_ADDED], tp = tp->q.cqe_next) + if (db_append(sp, 1, lno, tp->lb, tp->len)) + goto err; + + if (db_append(sp, 1, lno, t, clen)) + goto err; + ++sp->rptlines[L_ADDED]; + } + rval = 0; + + if (0) +err: rval = 1; + + FREE_SPACE(sp, bp, blen); + return (rval); +} |
