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#define _POSIX_C_SOURCE 200809L
#include <dirent.h>
#include <zlib.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define LINE_SIZE 8192
struct MatchList
{
char** paths;
size_t count;
size_t capacity;
};
static bool match_list_add(struct MatchList* matches, const char* path)
{
if (matches->count == matches->capacity)
{
size_t new_capacity = matches->capacity == 0 ? 16 : matches->capacity * 2;
char** grown = realloc(matches->paths, new_capacity * sizeof(char*));
if (grown == NULL)
return false;
matches->paths = grown;
matches->capacity = new_capacity;
}
char* copy = strdup(path);
if (copy == NULL)
return false;
matches->paths[matches->count] = copy;
matches->count++;
return true;
}
static void match_list_free(struct MatchList* matches)
{
for (size_t index = 0; index < matches->count; index++)
free(matches->paths[index]);
free(matches->paths);
}
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, struct MatchList* matches)
{
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) match_list_add(matches, path);
}
(void) closedir(section_stream);
}
static void list_sections(const char* directory, const char* query, struct MatchList* matches)
{
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, matches);
}
(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];
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';
struct MatchList matches = {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, &matches);
for (size_t index = 0; index < matches.count; index++)
(void) printf("%zu) %s\n", index + 1, matches.paths[index]);
match_list_free(&matches);
return 0;
}
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