/*- * 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[] = "$Id: cut.c,v 10.12 2012/02/11 15:52:33 zy Exp $"; #endif /* not lint */ #include #include #include #include #include #include #include #include #include #include #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( SCR *sp, CHAR_T *namep, MARK *fm, MARK *tm, int flags) { CB *cbp; CHAR_T name = '\0'; 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`, * 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))) { 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; TAILQ_INIT(cbp->textq); SLIST_INSERT_HEAD(sp->gp->cutq, cbp, q); } else if (!append) { text_lfree(cbp->textq); cbp->len = 0; cbp->flags = 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, ENTIRE_LINE, cbp)) goto cut_line_err; } else { /* * Get the first line. A length of ENTIRE_LINE 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(SCR *sp) { CB *cbp, *del_cbp = NULL, *pre_cbp = NULL; SLIST_FOREACH(cbp, sp->gp->cutq, q) { switch(cbp->name) { case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': cbp->name += 1; break; case '9': if (cbp == SLIST_FIRST(sp->gp->cutq)) SLIST_REMOVE_HEAD(sp->gp->cutq, q); else SLIST_REMOVE_AFTER(pre_cbp, q); del_cbp = cbp; break; } pre_cbp = cbp; } if (del_cbp != NULL) { 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( SCR *sp, recno_t lno, size_t fcno, size_t clen, CB *cbp) { TEXT *tp; size_t len; CHAR_T *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 == ENTIRE_LINE) clen = len - fcno; MEMCPY(tp->lb, p + fcno, clen); tp->len = clen; } /* Append to the end of the cut buffer. */ TAILQ_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(GS *gp) { CB *cbp; /* Free cut buffer list. */ while ((cbp = SLIST_FIRST(gp->cutq)) != NULL) { if (!TAILQ_EMPTY(cbp->textq)) text_lfree(cbp->textq); SLIST_REMOVE_HEAD(gp->cutq, q); free(cbp); } /* Free default cut storage. */ cbp = &gp->dcb_store; if (!TAILQ_EMPTY(cbp->textq)) text_lfree(cbp->textq); } /* * text_init -- * Allocate a new TEXT structure. * * PUBLIC: TEXT *text_init __P((SCR *, const CHAR_T *, size_t, size_t)); */ TEXT * text_init( SCR *sp, const CHAR_T *p, size_t len, size_t 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 * sizeof(CHAR_T)) != 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(TEXTH *headp) { TEXT *tp; while ((tp = TAILQ_FIRST(headp)) != NULL) { TAILQ_REMOVE(headp, tp, q); text_free(tp); } } /* * text_free -- * Free a text structure. * * PUBLIC: void text_free __P((TEXT *)); */ void text_free(TEXT *tp) { if (tp->lb != NULL) free(tp->lb); free(tp); }