diff options
Diffstat (limited to 'contrib/nvi/common/cut.c')
| -rw-r--r-- | contrib/nvi/common/cut.c | 368 |
1 files changed, 368 insertions, 0 deletions
diff --git a/contrib/nvi/common/cut.c b/contrib/nvi/common/cut.c new file mode 100644 index 0000000..faceecd --- /dev/null +++ b/contrib/nvi/common/cut.c @@ -0,0 +1,368 @@ +/*- + * 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[] = "@(#)cut.c 10.10 (Berkeley) 9/15/96"; +#endif /* not lint */ + +#include <sys/types.h> +#include <sys/queue.h> + +#include <bitstring.h> +#include <ctype.h> +#include <errno.h> +#include <fcntl.h> +#include <limits.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include "common.h" + +static void cb_rotate __P((SCR *)); + +/* + * cut -- + * Put a range of lines/columns into a TEXT buffer. + * + * There are two buffer areas, both found in the global structure. The first + * is the linked list of all the buffers the user has named, the second is the + * unnamed buffer storage. There is a pointer, too, which is the current + * default buffer, i.e. it may point to the unnamed buffer or a named buffer + * depending on into what buffer the last text was cut. Logically, in both + * delete and yank operations, if the user names a buffer, the text is cut + * into it. If it's a delete of information on more than a single line, the + * contents of the numbered buffers are rotated up one, the contents of the + * buffer named '9' are discarded, and the text is cut into the buffer named + * '1'. The text is always cut into the unnamed buffer. + * + * In all cases, upper-case buffer names are the same as lower-case names, + * with the exception that they cause the buffer to be appended to instead + * of replaced. Note, however, that if text is appended to a buffer, the + * default buffer only contains the appended text, not the entire contents + * of the buffer. + * + * !!! + * The contents of the default buffer would disappear after most operations + * in historic vi. It's unclear that this is useful, so we don't bother. + * + * When users explicitly cut text into the numeric buffers, historic vi became + * genuinely strange. I've never been able to figure out what was supposed to + * happen. It behaved differently if you deleted text than if you yanked text, + * and, in the latter case, the text was appended to the buffer instead of + * replacing the contents. Hopefully it's not worth getting right, and here + * we just treat the numeric buffers like any other named buffer. + * + * PUBLIC: int cut __P((SCR *, CHAR_T *, MARK *, MARK *, int)); + */ +int +cut(sp, namep, fm, tm, flags) + SCR *sp; + CHAR_T *namep; + MARK *fm, *tm; + int flags; +{ + CB *cbp; + CHAR_T name; + recno_t lno; + int append, copy_one, copy_def; + + /* + * If the user specified a buffer, put it there. (This may require + * a copy into the numeric buffers. We do the copy so that we don't + * have to reference count and so we don't have to deal with things + * like appends to buffers that are used multiple times.) + * + * Otherwise, if it's supposed to be put in a numeric buffer (usually + * a delete) put it there. The rules for putting things in numeric + * buffers were historically a little strange. There were three cases. + * + * 1: Some motions are always line mode motions, which means + * that the cut always goes into the numeric buffers. + * 2: Some motions aren't line mode motions, e.g. d10w, but + * can cross line boundaries. For these commands, if the + * cut crosses a line boundary, it goes into the numeric + * buffers. This includes most of the commands. + * 3: Some motions aren't line mode motions, e.g. d`<char>, + * but always go into the numeric buffers, regardless. This + * was the commands: % ` / ? ( ) N n { } -- and nvi adds ^A. + * + * Otherwise, put it in the unnamed buffer. + */ + append = copy_one = copy_def = 0; + if (namep != NULL) { + name = *namep; + if (LF_ISSET(CUT_NUMREQ) || LF_ISSET(CUT_NUMOPT) && + (LF_ISSET(CUT_LINEMODE) || fm->lno != tm->lno)) { + copy_one = 1; + cb_rotate(sp); + } + if ((append = isupper(name)) == 1) { + if (!copy_one) + copy_def = 1; + name = tolower(name); + } +namecb: CBNAME(sp, cbp, name); + } else if (LF_ISSET(CUT_NUMREQ) || LF_ISSET(CUT_NUMOPT) && + (LF_ISSET(CUT_LINEMODE) || fm->lno != tm->lno)) { + name = '1'; + cb_rotate(sp); + goto namecb; + } else + cbp = &sp->gp->dcb_store; + +copyloop: + /* + * If this is a new buffer, create it and add it into the list. + * Otherwise, if it's not an append, free its current contents. + */ + if (cbp == NULL) { + CALLOC_RET(sp, cbp, CB *, 1, sizeof(CB)); + cbp->name = name; + CIRCLEQ_INIT(&cbp->textq); + LIST_INSERT_HEAD(&sp->gp->cutq, cbp, q); + } else if (!append) { + text_lfree(&cbp->textq); + cbp->len = 0; + cbp->flags = 0; + } + + +#define ENTIRE_LINE 0 + /* In line mode, it's pretty easy, just cut the lines. */ + if (LF_ISSET(CUT_LINEMODE)) { + cbp->flags |= CB_LMODE; + for (lno = fm->lno; lno <= tm->lno; ++lno) + if (cut_line(sp, lno, 0, 0, cbp)) + goto cut_line_err; + } else { + /* + * Get the first line. A length of 0 causes cut_line + * to cut from the MARK to the end of the line. + */ + if (cut_line(sp, fm->lno, fm->cno, fm->lno != tm->lno ? + ENTIRE_LINE : (tm->cno - fm->cno) + 1, cbp)) + goto cut_line_err; + + /* Get the intermediate lines. */ + for (lno = fm->lno; ++lno < tm->lno;) + if (cut_line(sp, lno, 0, ENTIRE_LINE, cbp)) + goto cut_line_err; + + /* Get the last line. */ + if (tm->lno != fm->lno && + cut_line(sp, lno, 0, tm->cno + 1, cbp)) + goto cut_line_err; + } + + append = 0; /* Only append to the named buffer. */ + sp->gp->dcbp = cbp; /* Repoint the default buffer on each pass. */ + + if (copy_one) { /* Copy into numeric buffer 1. */ + name = '1'; + CBNAME(sp, cbp, name); + copy_one = 0; + goto copyloop; + } + if (copy_def) { /* Copy into the default buffer. */ + cbp = &sp->gp->dcb_store; + copy_def = 0; + goto copyloop; + } + return (0); + +cut_line_err: + text_lfree(&cbp->textq); + cbp->len = 0; + cbp->flags = 0; + return (1); +} + +/* + * cb_rotate -- + * Rotate the numbered buffers up one. + */ +static void +cb_rotate(sp) + SCR *sp; +{ + CB *cbp, *del_cbp; + + del_cbp = NULL; + for (cbp = sp->gp->cutq.lh_first; cbp != NULL; cbp = cbp->q.le_next) + switch(cbp->name) { + case '1': + cbp->name = '2'; + break; + case '2': + cbp->name = '3'; + break; + case '3': + cbp->name = '4'; + break; + case '4': + cbp->name = '5'; + break; + case '5': + cbp->name = '6'; + break; + case '6': + cbp->name = '7'; + break; + case '7': + cbp->name = '8'; + break; + case '8': + cbp->name = '9'; + break; + case '9': + del_cbp = cbp; + break; + } + if (del_cbp != NULL) { + LIST_REMOVE(del_cbp, q); + text_lfree(&del_cbp->textq); + free(del_cbp); + } +} + +/* + * cut_line -- + * Cut a portion of a single line. + * + * PUBLIC: int cut_line __P((SCR *, recno_t, size_t, size_t, CB *)); + */ +int +cut_line(sp, lno, fcno, clen, cbp) + SCR *sp; + recno_t lno; + size_t fcno, clen; + CB *cbp; +{ + TEXT *tp; + size_t len; + char *p; + + /* Get the line. */ + if (db_get(sp, lno, DBG_FATAL, &p, &len)) + return (1); + + /* Create a TEXT structure that can hold the entire line. */ + if ((tp = text_init(sp, NULL, 0, len)) == NULL) + return (1); + + /* + * If the line isn't empty and it's not the entire line, + * copy the portion we want, and reset the TEXT length. + */ + if (len != 0) { + if (clen == 0) + clen = len - fcno; + memcpy(tp->lb, p + fcno, clen); + tp->len = clen; + } + + /* Append to the end of the cut buffer. */ + CIRCLEQ_INSERT_TAIL(&cbp->textq, tp, q); + cbp->len += tp->len; + + return (0); +} + +/* + * cut_close -- + * Discard all cut buffers. + * + * PUBLIC: void cut_close __P((GS *)); + */ +void +cut_close(gp) + GS *gp; +{ + CB *cbp; + + /* Free cut buffer list. */ + while ((cbp = gp->cutq.lh_first) != NULL) { + if (cbp->textq.cqh_first != (void *)&cbp->textq) + text_lfree(&cbp->textq); + LIST_REMOVE(cbp, q); + free(cbp); + } + + /* Free default cut storage. */ + cbp = &gp->dcb_store; + if (cbp->textq.cqh_first != (void *)&cbp->textq) + text_lfree(&cbp->textq); +} + +/* + * text_init -- + * Allocate a new TEXT structure. + * + * PUBLIC: TEXT *text_init __P((SCR *, const char *, size_t, size_t)); + */ +TEXT * +text_init(sp, p, len, total_len) + SCR *sp; + const char *p; + size_t len, total_len; +{ + TEXT *tp; + + CALLOC(sp, tp, TEXT *, 1, sizeof(TEXT)); + if (tp == NULL) + return (NULL); + /* ANSI C doesn't define a call to malloc(3) for 0 bytes. */ + if ((tp->lb_len = total_len) != 0) { + MALLOC(sp, tp->lb, CHAR_T *, tp->lb_len); + if (tp->lb == NULL) { + free(tp); + return (NULL); + } + if (p != NULL && len != 0) + memcpy(tp->lb, p, len); + } + tp->len = len; + return (tp); +} + +/* + * text_lfree -- + * Free a chain of text structures. + * + * PUBLIC: void text_lfree __P((TEXTH *)); + */ +void +text_lfree(headp) + TEXTH *headp; +{ + TEXT *tp; + + while ((tp = headp->cqh_first) != (void *)headp) { + CIRCLEQ_REMOVE(headp, tp, q); + text_free(tp); + } +} + +/* + * text_free -- + * Free a text structure. + * + * PUBLIC: void text_free __P((TEXT *)); + */ +void +text_free(tp) + TEXT *tp; +{ + if (tp->lb != NULL) + free(tp->lb); + free(tp); +} |
