1 /*- 2 * Copyright (c) 1992, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * Copyright (c) 1992, 1993, 1994, 1995, 1996 5 * Keith Bostic. All rights reserved. 6 * 7 * See the LICENSE file for redistribution information. 8 */ 9 10 #include "config.h" 11 12 #ifndef lint 13 static const char sccsid[] = "@(#)ex_join.c 10.10 (Berkeley) 9/15/96"; 14 #endif /* not lint */ 15 16 #include <sys/types.h> 17 #include <sys/queue.h> 18 19 #include <bitstring.h> 20 #include <ctype.h> 21 #include <limits.h> 22 #include <stdio.h> 23 #include <stdlib.h> 24 #include <string.h> 25 26 #include "../common/common.h" 27 28 /* 29 * ex_join -- :[line [,line]] j[oin][!] [count] [flags] 30 * Join lines. 31 * 32 * PUBLIC: int ex_join __P((SCR *, EXCMD *)); 33 */ 34 int 35 ex_join(sp, cmdp) 36 SCR *sp; 37 EXCMD *cmdp; 38 { 39 recno_t from, to; 40 size_t blen, clen, len, tlen; 41 int echar, extra, first; 42 char *bp, *p, *tbp; 43 44 NEEDFILE(sp, cmdp); 45 46 from = cmdp->addr1.lno; 47 to = cmdp->addr2.lno; 48 49 /* Check for no lines to join. */ 50 if (!db_exist(sp, from + 1)) { 51 msgq(sp, M_ERR, "131|No following lines to join"); 52 return (1); 53 } 54 55 GET_SPACE_RET(sp, bp, blen, 256); 56 57 /* 58 * The count for the join command was off-by-one, 59 * historically, to other counts for other commands. 60 */ 61 if (FL_ISSET(cmdp->iflags, E_C_COUNT)) 62 ++cmdp->addr2.lno; 63 64 /* 65 * If only a single address specified, or, the same address 66 * specified twice, the from/two addresses will be the same. 67 */ 68 if (cmdp->addr1.lno == cmdp->addr2.lno) 69 ++cmdp->addr2.lno; 70 71 clen = tlen = 0; 72 for (first = 1, 73 from = cmdp->addr1.lno, to = cmdp->addr2.lno; from <= to; ++from) { 74 /* 75 * Get next line. Historic versions of vi allowed "10J" while 76 * less than 10 lines from the end-of-file, so we do too. 77 */ 78 if (db_get(sp, from, 0, &p, &len)) { 79 cmdp->addr2.lno = from - 1; 80 break; 81 } 82 83 /* Empty lines just go away. */ 84 if (len == 0) 85 continue; 86 87 /* 88 * Get more space if necessary. Note, tlen isn't the length 89 * of the new line, it's roughly the amount of space needed. 90 * tbp - bp is the length of the new line. 91 */ 92 tlen += len + 2; 93 ADD_SPACE_RET(sp, bp, blen, tlen); 94 tbp = bp + clen; 95 96 /* 97 * Historic practice: 98 * 99 * If force specified, join without modification. 100 * If the current line ends with whitespace, strip leading 101 * whitespace from the joined line. 102 * If the next line starts with a ), do nothing. 103 * If the current line ends with ., insert two spaces. 104 * Else, insert one space. 105 * 106 * One change -- add ? and ! to the list of characters for 107 * which we insert two spaces. I expect that POSIX 1003.2 108 * will require this as well. 109 * 110 * Echar is the last character in the last line joined. 111 */ 112 extra = 0; 113 if (!first && !FL_ISSET(cmdp->iflags, E_C_FORCE)) { 114 if (isblank(echar)) 115 for (; len && isblank(*p); --len, ++p); 116 else if (p[0] != ')') { 117 if (strchr(".?!", echar)) { 118 *tbp++ = ' '; 119 ++clen; 120 extra = 1; 121 } 122 *tbp++ = ' '; 123 ++clen; 124 for (; len && isblank(*p); --len, ++p); 125 } 126 } 127 128 if (len != 0) { 129 memcpy(tbp, p, len); 130 tbp += len; 131 clen += len; 132 echar = p[len - 1]; 133 } else 134 echar = ' '; 135 136 /* 137 * Historic practice for vi was to put the cursor at the first 138 * inserted whitespace character, if there was one, or the 139 * first character of the joined line, if there wasn't, or the 140 * last character of the line if joined to an empty line. If 141 * a count was specified, the cursor was moved as described 142 * for the first line joined, ignoring subsequent lines. If 143 * the join was a ':' command, the cursor was placed at the 144 * first non-blank character of the line unless the cursor was 145 * "attracted" to the end of line when the command was executed 146 * in which case it moved to the new end of line. There are 147 * probably several more special cases, but frankly, my dear, 148 * I don't give a damn. This implementation puts the cursor 149 * on the first inserted whitespace character, the first 150 * character of the joined line, or the last character of the 151 * line regardless. Note, if the cursor isn't on the joined 152 * line (possible with : commands), it is reset to the starting 153 * line. 154 */ 155 if (first) { 156 sp->cno = (tbp - bp) - (1 + extra); 157 first = 0; 158 } else 159 sp->cno = (tbp - bp) - len - (1 + extra); 160 } 161 sp->lno = cmdp->addr1.lno; 162 163 /* Delete the joined lines. */ 164 for (from = cmdp->addr1.lno, to = cmdp->addr2.lno; to > from; --to) 165 if (db_delete(sp, to)) 166 goto err; 167 168 /* If the original line changed, reset it. */ 169 if (!first && db_set(sp, from, bp, tbp - bp)) { 170 err: FREE_SPACE(sp, bp, blen); 171 return (1); 172 } 173 FREE_SPACE(sp, bp, blen); 174 175 sp->rptlines[L_JOINED] += (cmdp->addr2.lno - cmdp->addr1.lno) + 1; 176 return (0); 177 } 178