1 /* $OpenBSD: ex_join.c,v 1.6 2009/10/27 23:59:47 deraadt Exp $ */ 2 3 /*- 4 * Copyright (c) 1992, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * Copyright (c) 1992, 1993, 1994, 1995, 1996 7 * Keith Bostic. All rights reserved. 8 * 9 * See the LICENSE file for redistribution information. 10 */ 11 12 #include "config.h" 13 14 #include <sys/types.h> 15 #include <sys/queue.h> 16 17 #include <bitstring.h> 18 #include <ctype.h> 19 #include <limits.h> 20 #include <stdio.h> 21 #include <stdlib.h> 22 #include <string.h> 23 24 #include "../common/common.h" 25 26 /* 27 * ex_join -- :[line [,line]] j[oin][!] [count] [flags] 28 * Join lines. 29 * 30 * PUBLIC: int ex_join(SCR *, EXCMD *); 31 */ 32 int 33 ex_join(sp, cmdp) 34 SCR *sp; 35 EXCMD *cmdp; 36 { 37 recno_t from, to; 38 size_t blen, clen, len, tlen; 39 int echar, extra, first; 40 char *bp, *p, *tbp; 41 42 NEEDFILE(sp, cmdp); 43 44 from = cmdp->addr1.lno; 45 to = cmdp->addr2.lno; 46 47 /* Check for no lines to join. */ 48 if (!db_exist(sp, from + 1)) { 49 msgq(sp, M_ERR, "131|No following lines to join"); 50 return (1); 51 } 52 53 GET_SPACE_RET(sp, bp, blen, 256); 54 55 /* 56 * The count for the join command was off-by-one, 57 * historically, to other counts for other commands. 58 */ 59 if (FL_ISSET(cmdp->iflags, E_C_COUNT)) 60 ++cmdp->addr2.lno; 61 62 /* 63 * If only a single address specified, or, the same address 64 * specified twice, the from/two addresses will be the same. 65 */ 66 if (cmdp->addr1.lno == cmdp->addr2.lno) 67 ++cmdp->addr2.lno; 68 69 clen = tlen = 0; 70 for (first = 1, 71 from = cmdp->addr1.lno, to = cmdp->addr2.lno; from <= to; ++from) { 72 /* 73 * Get next line. Historic versions of vi allowed "10J" while 74 * less than 10 lines from the end-of-file, so we do too. 75 */ 76 if (db_get(sp, from, 0, &p, &len)) { 77 cmdp->addr2.lno = from - 1; 78 break; 79 } 80 81 /* Empty lines just go away. */ 82 if (len == 0) 83 continue; 84 85 /* 86 * Get more space if necessary. Note, tlen isn't the length 87 * of the new line, it's roughly the amount of space needed. 88 * tbp - bp is the length of the new line. 89 */ 90 tlen += len + 2; 91 ADD_SPACE_RET(sp, bp, blen, tlen); 92 tbp = bp + clen; 93 94 /* 95 * Historic practice: 96 * 97 * If force specified, join without modification. 98 * If the current line ends with whitespace, strip leading 99 * whitespace from the joined line. 100 * If the next line starts with a ), do nothing. 101 * If the current line ends with ., insert two spaces. 102 * Else, insert one space. 103 * 104 * One change -- add ? and ! to the list of characters for 105 * which we insert two spaces. I expect that POSIX 1003.2 106 * will require this as well. 107 * 108 * Echar is the last character in the last line joined. 109 */ 110 extra = 0; 111 if (!first && !FL_ISSET(cmdp->iflags, E_C_FORCE)) { 112 if (isblank(echar)) 113 for (; len && isblank(*p); --len, ++p); 114 else if (p[0] != ')') { 115 if (strchr(".?!", echar)) { 116 *tbp++ = ' '; 117 ++clen; 118 extra = 1; 119 } 120 *tbp++ = ' '; 121 ++clen; 122 for (; len && isblank(*p); --len, ++p); 123 } 124 } 125 126 if (len != 0) { 127 memcpy(tbp, p, len); 128 tbp += len; 129 clen += len; 130 echar = p[len - 1]; 131 } else 132 echar = ' '; 133 134 /* 135 * Historic practice for vi was to put the cursor at the first 136 * inserted whitespace character, if there was one, or the 137 * first character of the joined line, if there wasn't, or the 138 * last character of the line if joined to an empty line. If 139 * a count was specified, the cursor was moved as described 140 * for the first line joined, ignoring subsequent lines. If 141 * the join was a ':' command, the cursor was placed at the 142 * first non-blank character of the line unless the cursor was 143 * "attracted" to the end of line when the command was executed 144 * in which case it moved to the new end of line. There are 145 * probably several more special cases, but frankly, my dear, 146 * I don't give a damn. This implementation puts the cursor 147 * on the first inserted whitespace character, the first 148 * character of the joined line, or the last character of the 149 * line regardless. Note, if the cursor isn't on the joined 150 * line (possible with : commands), it is reset to the starting 151 * line. 152 */ 153 if (first) { 154 sp->cno = (tbp - bp) - (1 + extra); 155 first = 0; 156 } else 157 sp->cno = (tbp - bp) - len - (1 + extra); 158 } 159 sp->lno = cmdp->addr1.lno; 160 161 /* Delete the joined lines. */ 162 for (from = cmdp->addr1.lno, to = cmdp->addr2.lno; to > from; --to) 163 if (db_delete(sp, to)) 164 goto err; 165 166 /* If the original line changed, reset it. */ 167 if (!first && db_set(sp, from, bp, tbp - bp)) { 168 err: FREE_SPACE(sp, bp, blen); 169 return (1); 170 } 171 FREE_SPACE(sp, bp, blen); 172 173 sp->rptlines[L_JOINED] += (cmdp->addr2.lno - cmdp->addr1.lno) + 1; 174 return (0); 175 } 176