config_file.cpp File Reference

#include "config_msvc.h"
#include "config_file.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

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Classes
struct	config_file

Functions
void	config_file_close (struct config_file *s)
string	config_file_get_alias (struct config_file *s, const char *req_item_class, const char *requested_name)
string	config_file_get_capture_filter_for_alias (struct config_file *s, const char *alias)
struct config_file *	config_file_open (const char *name)
char *	default_config_file (char *buf, int buf_len)
std::list< std::pair< std::string, std::string > >	get_configured_capture_aliases (struct config_file *s)
static string	get_nth_word (struct config_file *s, const char *prefix, int index)

Function Documentation

config_file_close()

void config_file_close

(

struct config_file *

s

)

Definition at line 102 of file config_file.cpp.

{
        if (!s)
                return;
        if (s->f)
                fclose(s->f);
 
        free(s);
}

References config_file::f.

Referenced by vidcap_dispatch_alias().

config_file_get_alias()

string config_file_get_alias	(	struct config_file *	s,
		const char *	req_item_class,
		const char *	requested_name )

Returns alias for specified class and item name.

Caller must not deallocate returned value. Returned value is valid until corresponding instance of config_file is destroyed.

Parameters

s	config_file instance
req_item_class	textual representation of configuration file name
requested_name	requested alias

Return values

NULL	if not found
pointer	pointer to string representation of the aliased item

Definition at line 157 of file config_file.cpp.

{
        if (!s) {
                return {};
        }
 
        char prefix[1024];
        memset(prefix, 0, sizeof(prefix));
 
        snprintf(prefix, sizeof(prefix) - 1, "alias %s %s ",
                        req_item_class, requested_name);
 
        return get_nth_word(s, prefix, 0);
}

References get_nth_word().

Referenced by vidcap_dispatch_alias().

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config_file_get_capture_filter_for_alias()

string config_file_get_capture_filter_for_alias	(	struct config_file *	s,
		const char *	alias )

Definition at line 173 of file config_file.cpp.

{
        if (!s) {
                return {};
        }
 
        char prefix[1024];
        memset(prefix, 0, sizeof(prefix));
 
        snprintf(prefix, sizeof(prefix) - 1, "capture-filter %s ",
                        alias);
 
        return get_nth_word(s, prefix, 0);
}

References get_nth_word().

Referenced by vidcap_dispatch_alias().

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config_file_open()

struct config_file * config_file_open

(

const char *

name

)

Creates config file instance

Parameters

name	name of the config file

Returns

newly created instance. If opening of the config file failed, empty instance is returned and no error is reported!

Definition at line 87 of file config_file.cpp.

{
        if (name == NULL) {
                return NULL;
        }
        FILE *f = fopen(name, "r");
        if (f == NULL) {
                return NULL;
        }
        struct config_file *s = (struct config_file *) calloc(1, sizeof(struct config_file));
        s->f = f;
        strncpy(s->file_name, name, sizeof(s->file_name) - 1);
        return s;
}

References config_file::f, config_file::file_name, and name.

Referenced by vidcap_dispatch_alias().

default_config_file()

char * default_config_file	(	char *	buf,
		int	buf_len )

Returns location of default UltraGrid config file

Parameters

[out]	buf	buffer to be written to
[in]	buf_len	length of the buffer

Return values

NULL	if path cannot be constructed
buf	pointer output buffer pointer - if successfully performed

Definition at line 67 of file config_file.cpp.

{
        const char *rc_suffix = "/.ug.rc";
 
        if(!getenv("HOME")) {
                return NULL;
        }
 
        strncpy(buf, getenv("HOME"), buf_len - 1);
        strncat(buf, rc_suffix, buf_len - 1);
        return buf;
}

Referenced by vidcap_dispatch_alias().

get_configured_capture_aliases()

std::list< std::pair< std::string, std::string > > get_configured_capture_aliases

(

struct config_file *

s

)

Definition at line 189 of file config_file.cpp.

{
        if (!s) {
                return {};
        }
 
        fseek(s->f, 0, SEEK_SET); // rewind
 
        std::list<std::pair<std::string, std::string>> ret;
 
        char line[1024];
        char prefix[1024] = "";
        snprintf(prefix, sizeof prefix, "alias capture ");
        fseek(s->f, 0, SEEK_SET); // rewind
        while (fgets(line, sizeof(line), s->f)) {
                if (line[strlen(line) - 1] == '\n')
                        line[strlen(line) - 1] = '\0';
 
                if (strncasecmp(prefix, line, strlen(prefix)) == 0) {
                        char *suffix = line + strlen(prefix);
                        char *save_ptr, *item;
                        if ((item = strtok_r(suffix, " ", &save_ptr))) {
                                string name(item);
                                string description;
                                char *cfg = strtok_r(NULL, " ", &save_ptr); // skip config string
                                item = strtok_r(NULL, " ", &save_ptr); // skip config string
                                if (item) {
                                        description += item;
                                        while ((item = strtok_r(NULL, " ", &save_ptr))) {
                                                description += string(" ") + item;
                                        }
                                } else {
                                        description = cfg; // else use config string as description (grrr)
                                }
                                ret.emplace_back(name, description);
                        }
                }
        }
 
        return ret;
}

References description, config_file::f, name, and suffix.

get_nth_word()

static string get_nth_word ( struct config_file * s, const char * prefix, int index )

static

Definition at line 112 of file config_file.cpp.

{
        if (!s->f)
                return {};
 
        char line[1024];
        fseek(s->f, 0, SEEK_SET); // rewind
        while (fgets(line, sizeof(line), s->f)) {
                if (strncmp(prefix, line, strlen(prefix)) == 0) {
                        char *suffix = line + strlen(prefix);
                        if (suffix[strlen(suffix) - 1] == '\n')
                                suffix[strlen(suffix) - 1] = '\0';
 
                        char *item, *save_ptr, *tmp;
                        tmp = suffix;
                        int i = 0;
                        while ((item = strtok_r(tmp, " ", &save_ptr))) {
                                tmp = NULL;
                                if (i++ == index) {
                                        if (strlen(item) == 0) {
                                                return {};
                                        }
                                        return item;
                                }
                        }
                }
        }
 
        return string();
}

References config_file::f, and suffix.

Referenced by config_file_get_alias(), and config_file_get_capture_filter_for_alias().