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f5bcab4b WJ |
1 | /* misc.c */ |
2 | ||
3 | /* Author: | |
4 | * Steve Kirkendall | |
5 | * 14407 SW Teal Blvd. #C | |
6 | * Beaverton, OR 97005 | |
7 | * kirkenda@cs.pdx.edu | |
8 | */ | |
9 | ||
10 | ||
11 | /* This file contains functions which didn't seem happy anywhere else */ | |
12 | ||
13 | #include "config.h" | |
14 | #include "vi.h" | |
15 | ||
16 | ||
17 | /* find a particular line & return a pointer to a copy of its text */ | |
18 | char *fetchline(line) | |
19 | long line; /* line number of the line to fetch */ | |
20 | { | |
21 | int i; | |
22 | REG char *scan; /* used to search for the line in a BLK */ | |
23 | long l; /* line number counter */ | |
24 | static BLK buf; /* holds ONLY the selected line (as string) */ | |
25 | REG char *cpy; /* used while copying the line */ | |
26 | static long nextline; /* } These four variables are used */ | |
27 | static long chglevel; /* } to implement a shortcut when */ | |
28 | static char *nextscan; /* } consecutive lines are fetched */ | |
29 | static long nextlnum; /* } */ | |
30 | ||
31 | /* can we do a shortcut? */ | |
32 | if (changes == chglevel && line == nextline) | |
33 | { | |
34 | scan = nextscan; | |
35 | } | |
36 | else | |
37 | { | |
38 | /* scan lnum[] to determine which block its in */ | |
39 | for (i = 1; line > lnum[i]; i++) | |
40 | { | |
41 | } | |
42 | nextlnum = lnum[i]; | |
43 | ||
44 | /* fetch text of the block containing that line */ | |
45 | scan = blkget(i)->c; | |
46 | ||
47 | /* find the line in the block */ | |
48 | for (l = lnum[i - 1]; ++l < line; ) | |
49 | { | |
50 | while (*scan++ != '\n') | |
51 | { | |
52 | } | |
53 | } | |
54 | } | |
55 | ||
56 | /* copy it into a block by itself, with no newline */ | |
57 | for (cpy = buf.c; *scan != '\n'; ) | |
58 | { | |
59 | *cpy++ = *scan++; | |
60 | } | |
61 | *cpy = '\0'; | |
62 | ||
63 | /* maybe speed up the next call to fetchline() ? */ | |
64 | if (line < nextlnum) | |
65 | { | |
66 | nextline = line + 1; | |
67 | chglevel = changes; | |
68 | nextscan = scan + 1; | |
69 | } | |
70 | else | |
71 | { | |
72 | nextline = 0; | |
73 | } | |
74 | ||
75 | /* Calls to fetchline() interfere with calls to pfetch(). Make sure | |
76 | * that pfetch() resets itself on its next invocation. | |
77 | */ | |
78 | pchgs = 0L; | |
79 | ||
80 | /* Return a pointer to the line's text */ | |
81 | return buf.c; | |
82 | } | |
83 | ||
84 | ||
85 | /* error message from the regexp code */ | |
86 | void regerror(txt) | |
87 | char *txt; /* an error message */ | |
88 | { | |
89 | msg("RE error: %s", txt); | |
90 | } | |
91 | ||
92 | /* This function is equivelent to the pfetch() macro */ | |
93 | void pfetch(l) | |
94 | long l; /* line number of line to fetch */ | |
95 | { | |
96 | if(l != pline || changes != pchgs) | |
97 | { | |
98 | pline = (l); | |
99 | ptext = fetchline(pline); | |
100 | plen = strlen(ptext); | |
101 | pchgs = changes; | |
102 | } | |
103 | } |