diff options
Diffstat (limited to 'contrib/nvi/ex/ex_join.c')
| -rw-r--r-- | contrib/nvi/ex/ex_join.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/contrib/nvi/ex/ex_join.c b/contrib/nvi/ex/ex_join.c new file mode 100644 index 0000000..c26c424 --- /dev/null +++ b/contrib/nvi/ex/ex_join.c @@ -0,0 +1,177 @@ +/*- + * 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[] = "@(#)ex_join.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 <limits.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include "../common/common.h" + +/* + * ex_join -- :[line [,line]] j[oin][!] [count] [flags] + * Join lines. + * + * PUBLIC: int ex_join __P((SCR *, EXCMD *)); + */ +int +ex_join(sp, cmdp) + SCR *sp; + EXCMD *cmdp; +{ + recno_t from, to; + size_t blen, clen, len, tlen; + int echar, extra, first; + char *bp, *p, *tbp; + + NEEDFILE(sp, cmdp); + + from = cmdp->addr1.lno; + to = cmdp->addr2.lno; + + /* Check for no lines to join. */ + if (!db_exist(sp, from + 1)) { + msgq(sp, M_ERR, "131|No following lines to join"); + return (1); + } + + GET_SPACE_RET(sp, bp, blen, 256); + + /* + * The count for the join command was off-by-one, + * historically, to other counts for other commands. + */ + if (FL_ISSET(cmdp->iflags, E_C_COUNT)) + ++cmdp->addr2.lno; + + /* + * If only a single address specified, or, the same address + * specified twice, the from/two addresses will be the same. + */ + if (cmdp->addr1.lno == cmdp->addr2.lno) + ++cmdp->addr2.lno; + + clen = tlen = 0; + for (first = 1, + from = cmdp->addr1.lno, to = cmdp->addr2.lno; from <= to; ++from) { + /* + * Get next line. Historic versions of vi allowed "10J" while + * less than 10 lines from the end-of-file, so we do too. + */ + if (db_get(sp, from, 0, &p, &len)) { + cmdp->addr2.lno = from - 1; + break; + } + + /* Empty lines just go away. */ + if (len == 0) + continue; + + /* + * Get more space if necessary. Note, tlen isn't the length + * of the new line, it's roughly the amount of space needed. + * tbp - bp is the length of the new line. + */ + tlen += len + 2; + ADD_SPACE_RET(sp, bp, blen, tlen); + tbp = bp + clen; + + /* + * Historic practice: + * + * If force specified, join without modification. + * If the current line ends with whitespace, strip leading + * whitespace from the joined line. + * If the next line starts with a ), do nothing. + * If the current line ends with ., insert two spaces. + * Else, insert one space. + * + * One change -- add ? and ! to the list of characters for + * which we insert two spaces. I expect that POSIX 1003.2 + * will require this as well. + * + * Echar is the last character in the last line joined. + */ + extra = 0; + if (!first && !FL_ISSET(cmdp->iflags, E_C_FORCE)) { + if (isblank(echar)) + for (; len && isblank(*p); --len, ++p); + else if (p[0] != ')') { + if (strchr(".?!", echar)) { + *tbp++ = ' '; + ++clen; + extra = 1; + } + *tbp++ = ' '; + ++clen; + for (; len && isblank(*p); --len, ++p); + } + } + + if (len != 0) { + memcpy(tbp, p, len); + tbp += len; + clen += len; + echar = p[len - 1]; + } else + echar = ' '; + + /* + * Historic practice for vi was to put the cursor at the first + * inserted whitespace character, if there was one, or the + * first character of the joined line, if there wasn't, or the + * last character of the line if joined to an empty line. If + * a count was specified, the cursor was moved as described + * for the first line joined, ignoring subsequent lines. If + * the join was a ':' command, the cursor was placed at the + * first non-blank character of the line unless the cursor was + * "attracted" to the end of line when the command was executed + * in which case it moved to the new end of line. There are + * probably several more special cases, but frankly, my dear, + * I don't give a damn. This implementation puts the cursor + * on the first inserted whitespace character, the first + * character of the joined line, or the last character of the + * line regardless. Note, if the cursor isn't on the joined + * line (possible with : commands), it is reset to the starting + * line. + */ + if (first) { + sp->cno = (tbp - bp) - (1 + extra); + first = 0; + } else + sp->cno = (tbp - bp) - len - (1 + extra); + } + sp->lno = cmdp->addr1.lno; + + /* Delete the joined lines. */ + for (from = cmdp->addr1.lno, to = cmdp->addr2.lno; to > from; --to) + if (db_delete(sp, to)) + goto err; + + /* If the original line changed, reset it. */ + if (!first && db_set(sp, from, bp, tbp - bp)) { +err: FREE_SPACE(sp, bp, blen); + return (1); + } + FREE_SPACE(sp, bp, blen); + + sp->rptlines[L_JOINED] += (cmdp->addr2.lno - cmdp->addr1.lno) + 1; + return (0); +} |
