1 /* $OpenBSD: ex_join.c,v 1.8 2016/01/06 22:28:52 millert 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(SCR *sp, EXCMD *cmdp) 34 { 35 recno_t from, to; 36 size_t blen, clen, len, tlen; 37 int echar, extra, first; 38 char *bp, *p, *tbp; 39 40 NEEDFILE(sp, cmdp); 41 42 from = cmdp->addr1.lno; 43 to = cmdp->addr2.lno; 44 45 /* Check for no lines to join. */ 46 if (!db_exist(sp, from + 1)) { 47 msgq(sp, M_ERR, "No following lines to join"); 48 return (1); 49 } 50 51 GET_SPACE_RET(sp, bp, blen, 256); 52 53 /* 54 * The count for the join command was off-by-one, 55 * historically, to other counts for other commands. 56 */ 57 if (FL_ISSET(cmdp->iflags, E_C_COUNT)) 58 ++cmdp->addr2.lno; 59 60 /* 61 * If only a single address specified, or, the same address 62 * specified twice, the from/two addresses will be the same. 63 */ 64 if (cmdp->addr1.lno == cmdp->addr2.lno) 65 ++cmdp->addr2.lno; 66 67 clen = tlen = 0; 68 for (first = 1, 69 from = cmdp->addr1.lno, to = cmdp->addr2.lno; from <= to; ++from) { 70 /* 71 * Get next line. Historic versions of vi allowed "10J" while 72 * less than 10 lines from the end-of-file, so we do too. 73 */ 74 if (db_get(sp, from, 0, &p, &len)) { 75 cmdp->addr2.lno = from - 1; 76 break; 77 } 78 79 /* Empty lines just go away. */ 80 if (len == 0) 81 continue; 82 83 /* 84 * Get more space if necessary. Note, tlen isn't the length 85 * of the new line, it's roughly the amount of space needed. 86 * tbp - bp is the length of the new line. 87 */ 88 tlen += len + 2; 89 ADD_SPACE_RET(sp, bp, blen, tlen); 90 tbp = bp + clen; 91 92 /* 93 * Historic practice: 94 * 95 * If force specified, join without modification. 96 * If the current line ends with whitespace, strip leading 97 * whitespace from the joined line. 98 * If the next line starts with a ), do nothing. 99 * If the current line ends with ., insert two spaces. 100 * Else, insert one space. 101 * 102 * One change -- add ? and ! to the list of characters for 103 * which we insert two spaces. I expect that POSIX 1003.2 104 * will require this as well. 105 * 106 * Echar is the last character in the last line joined. 107 */ 108 extra = 0; 109 if (!first && !FL_ISSET(cmdp->iflags, E_C_FORCE)) { 110 if (isblank(echar)) 111 for (; len && isblank(*p); --len, ++p); 112 else if (p[0] != ')') { 113 if (strchr(".?!", echar)) { 114 *tbp++ = ' '; 115 ++clen; 116 extra = 1; 117 } 118 *tbp++ = ' '; 119 ++clen; 120 for (; len && isblank(*p); --len, ++p); 121 } 122 } 123 124 if (len != 0) { 125 memcpy(tbp, p, len); 126 tbp += len; 127 clen += len; 128 echar = p[len - 1]; 129 } else 130 echar = ' '; 131 132 /* 133 * Historic practice for vi was to put the cursor at the first 134 * inserted whitespace character, if there was one, or the 135 * first character of the joined line, if there wasn't, or the 136 * last character of the line if joined to an empty line. If 137 * a count was specified, the cursor was moved as described 138 * for the first line joined, ignoring subsequent lines. If 139 * the join was a ':' command, the cursor was placed at the 140 * first non-blank character of the line unless the cursor was 141 * "attracted" to the end of line when the command was executed 142 * in which case it moved to the new end of line. There are 143 * probably several more special cases, but frankly, my dear, 144 * I don't give a damn. This implementation puts the cursor 145 * on the first inserted whitespace character, the first 146 * character of the joined line, or the last character of the 147 * line regardless. Note, if the cursor isn't on the joined 148 * line (possible with : commands), it is reset to the starting 149 * line. 150 */ 151 if (first) { 152 sp->cno = (tbp - bp) - (1 + extra); 153 first = 0; 154 } else 155 sp->cno = (tbp - bp) - len - (1 + extra); 156 } 157 sp->lno = cmdp->addr1.lno; 158 159 /* Delete the joined lines. */ 160 for (from = cmdp->addr1.lno, to = cmdp->addr2.lno; to > from; --to) 161 if (db_delete(sp, to)) 162 goto err; 163 164 /* If the original line changed, reset it. */ 165 if (!first && db_set(sp, from, bp, tbp - bp)) { 166 err: FREE_SPACE(sp, bp, blen); 167 return (1); 168 } 169 FREE_SPACE(sp, bp, blen); 170 171 sp->rptlines[L_JOINED] += (cmdp->addr2.lno - cmdp->addr1.lno) + 1; 172 return (0); 173 } 174