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 #include <sys/types.h> 13 #include <sys/queue.h> 14 #include <sys/time.h> 15 16 #include <bitstring.h> 17 #include <ctype.h> 18 #include <limits.h> 19 #include <stdio.h> 20 #include <stdlib.h> 21 #include <string.h> 22 23 #include "../common/common.h" 24 25 /* 26 * ex_join -- :[line [,line]] j[oin][!] [count] [flags] 27 * Join lines. 28 * 29 * PUBLIC: int ex_join(SCR *, EXCMD *); 30 */ 31 int 32 ex_join(SCR *sp, EXCMD *cmdp) 33 { 34 recno_t from, to; 35 size_t blen, clen, len, tlen; 36 int echar = 0, extra, first; 37 CHAR_T *bp, *tbp = NULL; 38 CHAR_T *p; 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, "131|No following lines to join"); 48 return (1); 49 } 50 51 GET_SPACE_RETW(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 (F_ISSET(cmdp, E_ADDR_DEF) || cmdp->addrcnt == 1) 58 ++cmdp->addr2.lno; 59 60 clen = tlen = 0; 61 for (first = 1, 62 from = cmdp->addr1.lno, to = cmdp->addr2.lno; from <= to; ++from) { 63 /* 64 * Get next line. Historic versions of vi allowed "10J" while 65 * less than 10 lines from the end-of-file, so we do too. 66 */ 67 if (db_get(sp, from, 0, &p, &len)) { 68 cmdp->addr2.lno = from - 1; 69 break; 70 } 71 72 /* Empty lines just go away. */ 73 if (len == 0) 74 continue; 75 76 /* 77 * Get more space if necessary. Note, tlen isn't the length 78 * of the new line, it's roughly the amount of space needed. 79 * tbp - bp is the length of the new line. 80 */ 81 tlen += len + 2; 82 ADD_SPACE_RETW(sp, bp, blen, tlen); 83 tbp = bp + clen; 84 85 /* 86 * Historic practice: 87 * 88 * If force specified, join without modification. 89 * If the current line ends with whitespace, strip leading 90 * whitespace from the joined line. 91 * If the next line starts with a ), do nothing. 92 * If the current line ends with ., insert two spaces. 93 * Else, insert one space. 94 * 95 * One change -- add ? and ! to the list of characters for 96 * which we insert two spaces. I expect that POSIX 1003.2 97 * will require this as well. 98 * 99 * Echar is the last character in the last line joined. 100 */ 101 extra = 0; 102 if (!first && !FL_ISSET(cmdp->iflags, E_C_FORCE)) { 103 if (isblank(echar)) 104 for (; len && isblank(*p); --len, ++p); 105 else if (p[0] != ')') { 106 if (STRCHR(L(".?!"), echar)) { 107 *tbp++ = ' '; 108 ++clen; 109 extra = 1; 110 } 111 *tbp++ = ' '; 112 ++clen; 113 for (; len && isblank(*p); --len, ++p); 114 } 115 } 116 117 if (len != 0) { 118 MEMCPY(tbp, p, len); 119 tbp += len; 120 clen += len; 121 echar = p[len - 1]; 122 } else 123 echar = ' '; 124 125 /* 126 * Historic practice for vi was to put the cursor at the first 127 * inserted whitespace character, if there was one, or the 128 * first character of the joined line, if there wasn't, or the 129 * last character of the line if joined to an empty line. If 130 * a count was specified, the cursor was moved as described 131 * for the first line joined, ignoring subsequent lines. If 132 * the join was a ':' command, the cursor was placed at the 133 * first non-blank character of the line unless the cursor was 134 * "attracted" to the end of line when the command was executed 135 * in which case it moved to the new end of line. There are 136 * probably several more special cases, but frankly, my dear, 137 * I don't give a damn. This implementation puts the cursor 138 * on the first inserted whitespace character, the first 139 * character of the joined line, or the last character of the 140 * line regardless. Note, if the cursor isn't on the joined 141 * line (possible with : commands), it is reset to the starting 142 * line. 143 */ 144 if (first) { 145 sp->cno = (tbp - bp) - (1 + extra); 146 first = 0; 147 } else 148 sp->cno = (tbp - bp) - len - (1 + extra); 149 } 150 sp->lno = cmdp->addr1.lno; 151 152 /* Delete the joined lines. */ 153 for (from = cmdp->addr1.lno, to = cmdp->addr2.lno; to > from; --to) 154 if (db_delete(sp, to)) 155 goto err; 156 157 /* If the original line changed, reset it. */ 158 if (!first && db_set(sp, from, bp, tbp - bp)) { 159 err: FREE_SPACEW(sp, bp, blen); 160 return (1); 161 } 162 FREE_SPACEW(sp, bp, blen); 163 164 sp->rptlines[L_JOINED] += (cmdp->addr2.lno - cmdp->addr1.lno) + 1; 165 return (0); 166 } 167