1 /* 2 * Copyright (C) 1984-2002 Mark Nudelman 3 * 4 * You may distribute under the terms of either the GNU General Public 5 * License or the Less License, as specified in the README file. 6 * 7 * For more information about less, or for information on how to 8 * contact the author, see the README file. 9 */ 10 11 12 #include "less.h" 13 14 extern IFILE curr_ifile; 15 extern int sc_height; 16 extern int jump_sline; 17 18 /* 19 * A mark is an ifile (input file) plus a position within the file. 20 */ 21 struct mark { 22 IFILE m_ifile; 23 struct scrpos m_scrpos; 24 }; 25 26 /* 27 * The table of marks. 28 * Each mark is identified by a lowercase or uppercase letter. 29 * The final one is lmark, for the "last mark"; addressed by the apostrophe. 30 */ 31 #define NMARKS ((2*26)+1) /* a-z, A-Z, lastmark */ 32 #define LASTMARK (NMARKS-1) 33 static struct mark marks[NMARKS]; 34 35 /* 36 * Initialize the mark table to show no marks are set. 37 */ 38 public void 39 init_mark() 40 { 41 int i; 42 43 for (i = 0; i < NMARKS; i++) 44 marks[i].m_scrpos.pos = NULL_POSITION; 45 } 46 47 /* 48 * See if a mark letter is valid (between a and z). 49 */ 50 static struct mark * 51 getumark(c) 52 int c; 53 { 54 if (c >= 'a' && c <= 'z') 55 return (&marks[c-'a']); 56 57 if (c >= 'A' && c <= 'Z') 58 return (&marks[c-'A'+26]); 59 60 error("Invalid mark letter", NULL_PARG); 61 return (NULL); 62 } 63 64 /* 65 * Get the mark structure identified by a character. 66 * The mark struct may come either from the mark table 67 * or may be constructed on the fly for certain characters like ^, $. 68 */ 69 static struct mark * 70 getmark(c) 71 int c; 72 { 73 register struct mark *m; 74 static struct mark sm; 75 76 switch (c) 77 { 78 case '^': 79 /* 80 * Beginning of the current file. 81 */ 82 m = &sm; 83 m->m_scrpos.pos = ch_zero(); 84 m->m_scrpos.ln = 0; 85 m->m_ifile = curr_ifile; 86 break; 87 case '$': 88 /* 89 * End of the current file. 90 */ 91 if (ch_end_seek()) 92 { 93 error("Cannot seek to end of file", NULL_PARG); 94 return (NULL); 95 } 96 m = &sm; 97 m->m_scrpos.pos = ch_tell(); 98 m->m_scrpos.ln = sc_height-1; 99 m->m_ifile = curr_ifile; 100 break; 101 case '.': 102 /* 103 * Current position in the current file. 104 */ 105 m = &sm; 106 get_scrpos(&m->m_scrpos); 107 m->m_ifile = curr_ifile; 108 break; 109 case '\'': 110 /* 111 * The "last mark". 112 */ 113 m = &marks[LASTMARK]; 114 break; 115 default: 116 /* 117 * Must be a user-defined mark. 118 */ 119 m = getumark(c); 120 if (m == NULL) 121 break; 122 if (m->m_scrpos.pos == NULL_POSITION) 123 { 124 error("Mark not set", NULL_PARG); 125 return (NULL); 126 } 127 break; 128 } 129 return (m); 130 } 131 132 /* 133 * Is a mark letter is invalid? 134 */ 135 public int 136 badmark(c) 137 int c; 138 { 139 return (getmark(c) == NULL); 140 } 141 142 /* 143 * Set a user-defined mark. 144 */ 145 public void 146 setmark(c) 147 int c; 148 { 149 register struct mark *m; 150 struct scrpos scrpos; 151 152 m = getumark(c); 153 if (m == NULL) 154 return; 155 get_scrpos(&scrpos); 156 m->m_scrpos = scrpos; 157 m->m_ifile = curr_ifile; 158 } 159 160 /* 161 * Set lmark (the mark named by the apostrophe). 162 */ 163 public void 164 lastmark() 165 { 166 struct scrpos scrpos; 167 168 get_scrpos(&scrpos); 169 if (scrpos.pos == NULL_POSITION) 170 return; 171 marks[LASTMARK].m_scrpos = scrpos; 172 marks[LASTMARK].m_ifile = curr_ifile; 173 } 174 175 /* 176 * Go to a mark. 177 */ 178 public void 179 gomark(c) 180 int c; 181 { 182 register struct mark *m; 183 struct scrpos scrpos; 184 185 m = getmark(c); 186 if (m == NULL) 187 return; 188 189 /* 190 * If we're trying to go to the lastmark and 191 * it has not been set to anything yet, 192 * set it to the beginning of the current file. 193 */ 194 if (m == &marks[LASTMARK] && m->m_scrpos.pos == NULL_POSITION) 195 { 196 m->m_ifile = curr_ifile; 197 m->m_scrpos.pos = ch_zero(); 198 m->m_scrpos.ln = jump_sline; 199 } 200 201 /* 202 * If we're using lmark, we must save the screen position now, 203 * because if we call edit_ifile() below, lmark will change. 204 * (We save the screen position even if we're not using lmark.) 205 */ 206 scrpos = m->m_scrpos; 207 if (m->m_ifile != curr_ifile) 208 { 209 /* 210 * Not in the current file; edit the correct file. 211 */ 212 if (edit_ifile(m->m_ifile)) 213 return; 214 } 215 216 jump_loc(scrpos.pos, scrpos.ln); 217 } 218 219 /* 220 * Return the position associated with a given mark letter. 221 * 222 * We don't return which screen line the position 223 * is associated with, but this doesn't matter much, 224 * because it's always the first non-blank line on the screen. 225 */ 226 public POSITION 227 markpos(c) 228 int c; 229 { 230 register struct mark *m; 231 232 m = getmark(c); 233 if (m == NULL) 234 return (NULL_POSITION); 235 236 if (m->m_ifile != curr_ifile) 237 { 238 error("Mark not in current file", NULL_PARG); 239 return (NULL_POSITION); 240 } 241 return (m->m_scrpos.pos); 242 } 243 244 /* 245 * Clear the marks associated with a specified ifile. 246 */ 247 public void 248 unmark(ifile) 249 IFILE ifile; 250 { 251 int i; 252 253 for (i = 0; i < NMARKS; i++) 254 if (marks[i].m_ifile == ifile) 255 marks[i].m_scrpos.pos = NULL_POSITION; 256 } 257