1 /* $OpenBSD: v_section.c,v 1.6 2009/10/27 23:59:48 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 #include <sys/time.h> 17 18 #include <bitstring.h> 19 #include <limits.h> 20 #include <stdio.h> 21 #include <string.h> 22 23 #include "../common/common.h" 24 #include "vi.h" 25 26 /* 27 * !!! 28 * In historic vi, the section commands ignored empty lines, unlike the 29 * paragraph commands, which was probably okay. However, they also moved 30 * to the start of the last line when there where no more sections instead 31 * of the end of the last line like the paragraph commands. I've changed 32 * the latter behavior to match the paragraph commands. 33 * 34 * In historic vi, a section was defined as the first character(s) of the 35 * line matching, which could be followed by anything. This implementation 36 * follows that historic practice. 37 * 38 * !!! 39 * The historic vi documentation (USD:15-10) claimed: 40 * The section commands interpret a preceding count as a different 41 * window size in which to redraw the screen at the new location, 42 * and this window size is the base size for newly drawn windows 43 * until another size is specified. This is very useful if you are 44 * on a slow terminal ... 45 * 46 * I can't get the 4BSD vi to do this, it just beeps at me. For now, a 47 * count to the section commands simply repeats the command. 48 */ 49 50 /* 51 * v_sectionf -- [count]]] 52 * Move forward count sections/functions. 53 * 54 * !!! 55 * Using ]] as a motion command was a bit special, historically. It could 56 * match } as well as the usual { and section values. If it matched a { or 57 * a section, it did NOT include the matched line. If it matched a }, it 58 * did include the line. No clue why. 59 * 60 * PUBLIC: int v_sectionf(SCR *, VICMD *); 61 */ 62 int 63 v_sectionf(sp, vp) 64 SCR *sp; 65 VICMD *vp; 66 { 67 recno_t cnt, lno; 68 size_t len; 69 char *p, *list, *lp; 70 71 /* Get the macro list. */ 72 if ((list = O_STR(sp, O_SECTIONS)) == NULL) 73 return (1); 74 75 /* 76 * !!! 77 * If the starting cursor position is at or before any non-blank 78 * characters in the line, i.e. the movement is cutting all of the 79 * line's text, the buffer is in line mode. It's a lot easier to 80 * check here, because we know that the end is going to be the start 81 * or end of a line. 82 */ 83 if (ISMOTION(vp)) { 84 if (vp->m_start.cno == 0) 85 F_SET(vp, VM_LMODE); 86 else { 87 vp->m_stop = vp->m_start; 88 vp->m_stop.cno = 0; 89 if (nonblank(sp, vp->m_stop.lno, &vp->m_stop.cno)) 90 return (1); 91 if (vp->m_start.cno <= vp->m_stop.cno) 92 F_SET(vp, VM_LMODE); 93 } 94 } 95 96 cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1; 97 for (lno = vp->m_start.lno; !db_get(sp, ++lno, 0, &p, &len);) { 98 if (len == 0) 99 continue; 100 if (p[0] == '{' || (ISMOTION(vp) && p[0] == '}')) { 101 if (!--cnt) { 102 if (p[0] == '{') 103 goto adjust1; 104 goto adjust2; 105 } 106 continue; 107 } 108 /* 109 * !!! 110 * Historic documentation (USD:15-11, 4.2) said that formfeed 111 * characters (^L) in the first column delimited sections. 112 * The historic code mentions formfeed characters, but never 113 * implements them. Seems reasonable, do it. 114 */ 115 if (p[0] == '\014') { 116 if (!--cnt) 117 goto adjust1; 118 continue; 119 } 120 if (p[0] != '.' || len < 2) 121 continue; 122 for (lp = list; *lp != '\0'; lp += 2 * sizeof(*lp)) 123 if (lp[0] == p[1] && 124 ((lp[1] == ' ' && len == 2) || lp[1] == p[2]) && 125 !--cnt) { 126 /* 127 * !!! 128 * If not cutting this line, adjust to the end 129 * of the previous one. Otherwise, position to 130 * column 0. 131 */ 132 adjust1: if (ISMOTION(vp)) 133 goto ret1; 134 135 adjust2: vp->m_stop.lno = lno; 136 vp->m_stop.cno = 0; 137 goto ret2; 138 } 139 } 140 141 /* If moving forward, reached EOF, check to see if we started there. */ 142 if (vp->m_start.lno == lno - 1) { 143 v_eof(sp, NULL); 144 return (1); 145 } 146 147 ret1: if (db_get(sp, --lno, DBG_FATAL, NULL, &len)) 148 return (1); 149 vp->m_stop.lno = lno; 150 vp->m_stop.cno = len ? len - 1 : 0; 151 152 /* 153 * Non-motion commands go to the end of the range. Delete and 154 * yank stay at the start of the range. Ignore others. 155 */ 156 ret2: if (ISMOTION(vp)) { 157 vp->m_final = vp->m_start; 158 if (F_ISSET(vp, VM_LMODE)) 159 vp->m_final.cno = 0; 160 } else 161 vp->m_final = vp->m_stop; 162 return (0); 163 } 164 165 /* 166 * v_sectionb -- [count][[ 167 * Move backward count sections/functions. 168 * 169 * PUBLIC: int v_sectionb(SCR *, VICMD *); 170 */ 171 int 172 v_sectionb(sp, vp) 173 SCR *sp; 174 VICMD *vp; 175 { 176 size_t len; 177 recno_t cnt, lno; 178 char *p, *list, *lp; 179 180 /* An empty file or starting from line 1 is always illegal. */ 181 if (vp->m_start.lno <= 1) { 182 v_sof(sp, NULL); 183 return (1); 184 } 185 186 /* Get the macro list. */ 187 if ((list = O_STR(sp, O_SECTIONS)) == NULL) 188 return (1); 189 190 cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1; 191 for (lno = vp->m_start.lno; !db_get(sp, --lno, 0, &p, &len);) { 192 if (len == 0) 193 continue; 194 if (p[0] == '{') { 195 if (!--cnt) 196 goto adjust1; 197 continue; 198 } 199 /* 200 * !!! 201 * Historic documentation (USD:15-11, 4.2) said that formfeed 202 * characters (^L) in the first column delimited sections. 203 * The historic code mentions formfeed characters, but never 204 * implements them. Seems reasonable, do it. 205 */ 206 if (p[0] == '\014') { 207 if (!--cnt) 208 goto adjust1; 209 continue; 210 } 211 if (p[0] != '.' || len < 2) 212 continue; 213 for (lp = list; *lp != '\0'; lp += 2 * sizeof(*lp)) 214 if (lp[0] == p[1] && 215 ((lp[1] == ' ' && len == 2) || lp[1] == p[2]) && 216 !--cnt) { 217 adjust1: vp->m_stop.lno = lno; 218 vp->m_stop.cno = 0; 219 goto ret1; 220 } 221 } 222 223 /* 224 * If moving backward, reached SOF, which is a movement sink. 225 * We already checked for starting there. 226 */ 227 vp->m_stop.lno = 1; 228 vp->m_stop.cno = 0; 229 230 /* 231 * All commands move to the end of the range. 232 * 233 * !!! 234 * Historic practice is the section cut was in line mode if it started 235 * from column 0 and was in the backward direction. Otherwise, left 236 * motion commands adjust the starting point to the character before 237 * the current one. What makes this worse is that if it cut to line 238 * mode it also went to the first non-<blank>. 239 */ 240 ret1: if (vp->m_start.cno == 0) { 241 F_CLR(vp, VM_RCM_MASK); 242 F_SET(vp, VM_RCM_SETFNB); 243 244 --vp->m_start.lno; 245 F_SET(vp, VM_LMODE); 246 } else 247 --vp->m_start.cno; 248 249 vp->m_final = vp->m_stop; 250 return (0); 251 } 252