Commit | Line | Data |
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d60d9f65 SS |
1 | /* manexamp.c -- The examples which appear in the documentation are here. */ |
2 | ||
3 | #include <stdio.h> | |
4 | #include <readline/readline.h> | |
5 | ||
6 | ||
7 | /* **************************************************************** */ | |
8 | /* */ | |
9 | * How to Emulate gets () */ | |
10 | /* */ | |
11 | /* **************************************************************** */ | |
12 | ||
13 | /* A static variable for holding the line. */ | |
14 | static char *line_read = (char *)NULL; | |
15 | ||
16 | /* Read a string, and return a pointer to it. Returns NULL on EOF. */ | |
17 | char * | |
18 | rl_gets () | |
19 | { | |
20 | /* If the buffer has already been allocated, return the memory | |
21 | to the free pool. */ | |
22 | if (line_read) | |
23 | { | |
24 | free (line_read); | |
25 | line_read = (char *)NULL; | |
26 | } | |
27 | ||
28 | /* Get a line from the user. */ | |
29 | line_read = readline (""); | |
30 | ||
31 | /* If the line has any text in it, save it on the history. */ | |
32 | if (line_read && *line_read) | |
33 | add_history (line_read); | |
34 | ||
35 | return (line_read); | |
36 | } | |
37 | ||
38 | /* **************************************************************** */ | |
39 | /* */ | |
40 | /* Writing a Function to be Called by Readline. */ | |
41 | /* */ | |
42 | /* **************************************************************** */ | |
43 | ||
44 | /* Invert the case of the COUNT following characters. */ | |
45 | invert_case_line (count, key) | |
46 | int count, key; | |
47 | { | |
48 | register int start, end; | |
49 | ||
50 | start = rl_point; | |
51 | ||
52 | if (count < 0) | |
53 | { | |
54 | direction = -1; | |
55 | count = -count; | |
56 | } | |
57 | else | |
58 | direction = 1; | |
59 | ||
60 | /* Find the end of the range to modify. */ | |
61 | end = start + (count * direction); | |
62 | ||
63 | /* Force it to be within range. */ | |
64 | if (end > rl_end) | |
65 | end = rl_end; | |
66 | else if (end < 0) | |
67 | end = -1; | |
68 | ||
69 | if (start > end) | |
70 | { | |
71 | int temp = start; | |
72 | start = end; | |
73 | end = temp; | |
74 | } | |
75 | ||
76 | if (start == end) | |
77 | return; | |
78 | ||
79 | /* Tell readline that we are modifying the line, so save the undo | |
80 | information. */ | |
81 | rl_modifying (start, end); | |
82 | ||
83 | for (; start != end; start += direction) | |
84 | { | |
85 | if (uppercase_p (rl_line_buffer[start])) | |
86 | rl_line_buffer[start] = to_lower (rl_line_buffer[start]); | |
87 | else if (lowercase_p (rl_line_buffer[start])) | |
88 | rl_line_buffer[start] = to_upper (rl_line_buffer[start]); | |
89 | } | |
90 | ||
91 | /* Move point to on top of the last character changed. */ | |
92 | rl_point = end - direction; | |
93 | } | |
94 |