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1.1 etheisen 1: /*
1.4 millert 2: * Copyright (C) 1984-2002 Mark Nudelman
1.1 etheisen 3: *
1.4 millert 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.
1.1 etheisen 6: *
1.4 millert 7: * For more information about less, or for information on how to
8: * contact the author, see the README file.
1.1 etheisen 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.
1.4 millert 29: * The final one is lmark, for the "last mark"; addressed by the apostrophe.
1.1 etheisen 30: */
1.4 millert 31: #define NMARKS ((2*26)+1) /* a-z, A-Z, lastmark */
32: #define LASTMARK (NMARKS-1)
1.1 etheisen 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 ^, $.
68: */
69: static struct mark *
70: getmark(c)
71: int c;
72: {
1.4 millert 73: register struct mark *m;
1.1 etheisen 74: static struct mark sm;
75:
76: switch (c)
77: {
78: case '^':
79: /*
80: * Beginning of the current file.
81: */
82: m = &sm;
83: m->m_scrpos.pos = ch_zero();
84: m->m_scrpos.ln = 0;
85: m->m_ifile = curr_ifile;
86: break;
87: case '$':
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;
1.4 millert 106: get_scrpos(&m->m_scrpos);
1.1 etheisen 107: m->m_ifile = curr_ifile;
108: break;
109: case '\'':
110: /*
111: * The "last mark".
112: */
1.4 millert 113: m = &marks[LASTMARK];
1.1 etheisen 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: {
1.4 millert 149: register struct mark *m;
1.1 etheisen 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;
1.4 millert 171: marks[LASTMARK].m_scrpos = scrpos;
172: marks[LASTMARK].m_ifile = curr_ifile;
1.1 etheisen 173: }
174:
175: /*
176: * Go to a mark.
177: */
178: public void
179: gomark(c)
180: int c;
181: {
1.4 millert 182: register struct mark *m;
1.1 etheisen 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: */
1.4 millert 194: if (m == &marks[LASTMARK] && m->m_scrpos.pos == NULL_POSITION)
1.1 etheisen 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: {
1.4 millert 230: register struct mark *m;
1.1 etheisen 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);
1.4 millert 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;
1.1 etheisen 256: }