1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
#include <dirent.h>
#include <zlib.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#define LINE_SIZE 8192
static bool ends_with(const char* string, const char* suffix)
{
size_t string_length = strlen(string);
size_t suffix_length = strlen(suffix);
if (suffix_length > string_length)
return false;
return strcmp(string + string_length - suffix_length, suffix) == 0;
}
static bool plain_page_contains(const char* path, const char* query)
{
FILE* page = fopen(path, "r");
if (page == NULL)
return false;
char line[LINE_SIZE];
bool found = false;
while (fgets(line, sizeof(line), page) != NULL)
if (strstr(line, query) != NULL)
{
found = true;
break;
}
(void) fclose(page);
return found;
}
static bool gzip_page_contains(const char* path, const char* query)
{
gzFile page = gzopen(path, "r");
if (page == NULL)
return false;
char line[LINE_SIZE];
bool found = false;
while (gzgets(page, line, LINE_SIZE) != NULL)
if (strstr(line, query) != NULL)
{
found = true;
break;
}
(void) gzclose(page);
return found;
}
static bool page_contains(const char* path, const char* query)
{
if (ends_with(path, ".gz"))
return gzip_page_contains(path, query);
return plain_page_contains(path, query);
}
static void list_pages(const char* section, const char* query)
{
DIR* section_stream = opendir(section);
if (section_stream == NULL)
return;
for (const struct dirent* entry = readdir(section_stream);
entry != NULL;
entry = readdir(section_stream))
if (entry->d_name[0] != '.')
{
char path[4096];
(void) snprintf(path, sizeof(path), "%s/%s", section, entry->d_name);
if (page_contains(path, query))
(void) printf(" match: %s\n", path);
}
(void) closedir(section_stream);
}
static void list_sections(const char* directory, const char* query)
{
DIR* directory_stream = opendir(directory);
if (directory_stream == NULL)
return;
for (const struct dirent* entry = readdir(directory_stream);
entry != NULL;
entry = readdir(directory_stream))
if (strncmp(entry->d_name, "man", 3) == 0)
{
char section[4096];
(void) snprintf(section, sizeof(section), "%s/%s", directory, entry->d_name);
list_pages(section, query);
}
(void) closedir(directory_stream);
}
int main(int argc, char** argv)
{
if (argc != 2)
{
(void) fprintf(stderr, "usage: %s <symbol>\n", argv[0]);
return 1;
}
const char* query = argv[1];
(void) printf("searching for: %s\n", query);
FILE* manpath_pipe = popen("manpath", "r");
if (manpath_pipe == NULL)
{
(void) fprintf(stderr, "jafm: failed to run manpath\n");
return 1;
}
char buffer[4096];
if (fgets(buffer, sizeof(buffer), manpath_pipe) == NULL)
{
(void) fprintf(stderr, "jafm: failed to read manpath\n");
(void) pclose(manpath_pipe);
return 1;
}
(void) pclose(manpath_pipe);
buffer[strcspn(buffer, "\n")] = '\0';
char* save_pointer = NULL;
for (const char* directory = strtok_r(buffer, ":", &save_pointer);
directory != NULL;
directory = strtok_r(NULL, ":", &save_pointer))
{
list_sections(directory, query);
}
return 0;
}
|
