/* $OpenBSD: cut.c,v 1.18 2025/07/30 22:19:13 millert Exp $ */ /*- * 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" #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(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(SCR *, CHAR_T *, MARK *, MARK *, int); */ int cut(SCR *sp, CHAR_T *namep, MARK *fm, MARK *tm, int flags) { CB *cbp; CHAR_T name = '1'; /* default numeric buffer */ recno_t lno; int append, copy_one, copy_def; /* Check if the line numbers are out-of-band. */ if (fm->lno == OOBLNO || tm->lno == OOBLNO) return (1); /* * 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))) { /* Copy into numeric buffer 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, 1, sizeof(CB)); cbp->name = name; TAILQ_INIT(&cbp->textq); LIST_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, CUT_LINE_TO_EOL, cbp)) goto cut_line_err; } else { /* * Get the first line. A length of CUT_LINE_TO_EOL 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 ? CUT_LINE_TO_EOL : (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, CUT_LINE_TO_EOL, 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. */ 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; sp->gp->dcbp = NULL; return (1); } /* * cb_rotate -- * Rotate the numbered buffers up one. */ static void cb_rotate(SCR *sp) { CB *cbp, *del_cbp; del_cbp = NULL; LIST_FOREACH(cbp, &sp->gp->cutq, q) 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(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 *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 == CUT_LINE_TO_EOL) 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(GS *); */ void cut_close(GS *gp) { CB *cbp; /* Free cut buffer list. */ while ((cbp = LIST_FIRST(&gp->cutq)) != NULL) { if (!TAILQ_EMPTY(&cbp->textq)) text_lfree(&cbp->textq); LIST_REMOVE(cbp, 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(SCR *, const char *, size_t, size_t); */ TEXT * text_init(SCR *sp, const char *p, size_t len, size_t total_len) { TEXT *tp; CALLOC(sp, tp, 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, 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(TEXTH *); */ void text_lfree(TEXTH *headp) { TEXT *tp; while ((tp = TAILQ_FIRST(headp))) { TAILQ_REMOVE(headp, tp, q); text_free(tp); } } /* * text_free -- * Free a text structure. * * PUBLIC: void text_free(TEXT *); */ void text_free(TEXT *tp) { free(tp->lb); free(tp); }
