1 /* $OpenBSD: put.c,v 1.10 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.h" 25 26 /* 27 * put -- 28 * Put text buffer contents into the file. 29 * 30 * PUBLIC: int put(SCR *, CB *, CHAR_T *, MARK *, MARK *, int); 31 */ 32 int 33 put(sp, cbp, namep, cp, rp, append) 34 SCR *sp; 35 CB *cbp; 36 CHAR_T *namep; 37 MARK *cp, *rp; 38 int append; 39 { 40 CHAR_T name; 41 TEXT *ltp, *tp; 42 recno_t lno; 43 size_t blen, clen, len; 44 int rval; 45 char *bp, *p, *t; 46 47 if (cbp == NULL) { 48 if (namep == NULL) { 49 cbp = sp->gp->dcbp; 50 if (cbp == NULL) { 51 msgq(sp, M_ERR, 52 "053|The default buffer is empty"); 53 return (1); 54 } 55 } else { 56 name = *namep; 57 CBNAME(sp, cbp, name); 58 if (cbp == NULL) { 59 msgq(sp, M_ERR, "054|Buffer %s is empty", 60 KEY_NAME(sp, name)); 61 return (1); 62 } 63 } 64 } 65 tp = CIRCLEQ_FIRST(&cbp->textq); 66 67 /* 68 * It's possible to do a put into an empty file, meaning that the cut 69 * buffer simply becomes the file. It's a special case so that we can 70 * ignore it in general. 71 * 72 * !!! 73 * Historically, pasting into a file with no lines in vi would preserve 74 * the single blank line. This is surely a result of the fact that the 75 * historic vi couldn't deal with a file that had no lines in it. This 76 * implementation treats that as a bug, and does not retain the blank 77 * line. 78 * 79 * Historical practice is that the cursor ends at the first character 80 * in the file. 81 */ 82 if (cp->lno == 1) { 83 if (db_last(sp, &lno)) 84 return (1); 85 if (lno == 0) { 86 for (; tp != (void *)&cbp->textq; 87 ++lno, ++sp->rptlines[L_ADDED], 88 tp = CIRCLEQ_NEXT(tp, q)) 89 if (db_append(sp, 1, lno, tp->lb, tp->len)) 90 return (1); 91 rp->lno = 1; 92 rp->cno = 0; 93 return (0); 94 } 95 } 96 97 /* If a line mode buffer, append each new line into the file. */ 98 if (F_ISSET(cbp, CB_LMODE)) { 99 lno = append ? cp->lno : cp->lno - 1; 100 rp->lno = lno + 1; 101 for (; tp != CIRCLEQ_END(&cbp->textq); 102 ++lno, ++sp->rptlines[L_ADDED], tp = CIRCLEQ_NEXT(tp, q)) 103 if (db_append(sp, 1, lno, tp->lb, tp->len)) 104 return (1); 105 rp->cno = 0; 106 (void)nonblank(sp, rp->lno, &rp->cno); 107 return (0); 108 } 109 110 /* 111 * If buffer was cut in character mode, replace the current line with 112 * one built from the portion of the first line to the left of the 113 * split plus the first line in the CB. Append each intermediate line 114 * in the CB. Append a line built from the portion of the first line 115 * to the right of the split plus the last line in the CB. 116 * 117 * Get the first line. 118 */ 119 lno = cp->lno; 120 if (db_get(sp, lno, DBG_FATAL, &p, &len)) 121 return (1); 122 123 GET_SPACE_RET(sp, bp, blen, tp->len + len + 1); 124 t = bp; 125 126 /* Original line, left of the split. */ 127 if (len > 0 && (clen = cp->cno + (append ? 1 : 0)) > 0) { 128 memcpy(bp, p, clen); 129 p += clen; 130 t += clen; 131 } 132 133 /* First line from the CB. */ 134 if (tp->len != 0) { 135 memcpy(t, tp->lb, tp->len); 136 t += tp->len; 137 } 138 139 /* Calculate length left in the original line. */ 140 clen = len == 0 ? 0 : len - (cp->cno + (append ? 1 : 0)); 141 142 /* 143 * !!! 144 * In the historical 4BSD version of vi, character mode puts within 145 * a single line have two cursor behaviors: if the put is from the 146 * unnamed buffer, the cursor moves to the character inserted which 147 * appears last in the file. If the put is from a named buffer, 148 * the cursor moves to the character inserted which appears first 149 * in the file. In System III/V, it was changed at some point and 150 * the cursor always moves to the first character. In both versions 151 * of vi, character mode puts that cross line boundaries leave the 152 * cursor on the first character. Nvi implements the System III/V 153 * behavior, and expect POSIX.2 to do so as well. 154 */ 155 rp->lno = lno; 156 rp->cno = len == 0 ? 0 : sp->cno + (append && tp->len ? 1 : 0); 157 158 /* 159 * If no more lines in the CB, append the rest of the original 160 * line and quit. Otherwise, build the last line before doing 161 * the intermediate lines, because the line changes will lose 162 * the cached line. 163 */ 164 if (CIRCLEQ_NEXT(tp, q) == CIRCLEQ_END(&cbp->textq)) { 165 if (clen > 0) { 166 memcpy(t, p, clen); 167 t += clen; 168 } 169 if (db_set(sp, lno, bp, t - bp)) 170 goto err; 171 if (sp->rptlchange != lno) { 172 sp->rptlchange = lno; 173 ++sp->rptlines[L_CHANGED]; 174 } 175 } else { 176 /* 177 * Have to build both the first and last lines of the 178 * put before doing any sets or we'll lose the cached 179 * line. Build both the first and last lines in the 180 * same buffer, so we don't have to have another buffer 181 * floating around. 182 * 183 * Last part of original line; check for space, reset 184 * the pointer into the buffer. 185 */ 186 ltp = CIRCLEQ_LAST(&cbp->textq); 187 len = t - bp; 188 ADD_SPACE_RET(sp, bp, blen, ltp->len + clen); 189 t = bp + len; 190 191 /* Add in last part of the CB. */ 192 memcpy(t, ltp->lb, ltp->len); 193 if (clen) 194 memcpy(t + ltp->len, p, clen); 195 clen += ltp->len; 196 197 /* 198 * Now: bp points to the first character of the first 199 * line, t points to the last character of the last 200 * line, t - bp is the length of the first line, and 201 * clen is the length of the last. Just figured you'd 202 * want to know. 203 * 204 * Output the line replacing the original line. 205 */ 206 if (db_set(sp, lno, bp, t - bp)) 207 goto err; 208 if (sp->rptlchange != lno) { 209 sp->rptlchange = lno; 210 ++sp->rptlines[L_CHANGED]; 211 } 212 213 /* Output any intermediate lines in the CB. */ 214 for (tp = CIRCLEQ_NEXT(tp, q); 215 CIRCLEQ_NEXT(tp, q) != CIRCLEQ_END(&cbp->textq); 216 ++lno, ++sp->rptlines[L_ADDED], tp = CIRCLEQ_NEXT(tp, q)) 217 if (db_append(sp, 1, lno, tp->lb, tp->len)) 218 goto err; 219 220 if (db_append(sp, 1, lno, t, clen)) 221 goto err; 222 ++sp->rptlines[L_ADDED]; 223 } 224 rval = 0; 225 226 if (0) 227 err: rval = 1; 228 229 FREE_SPACE(sp, bp, blen); 230 return (rval); 231 } 232