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/*
Copyright 2013 Michael Pavone
This file is part of BlastEm.
BlastEm is free software distributed under the terms of the GNU General Public License version 3 or greater. See COPYING for full license text.
*/
#include "tern.h"
#include "util.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#define MAX_NEST 30 //way more than I'll ever need
tern_node * parse_config(char * config_data)
{
char *state, *curline;
char *prefix = NULL;
int nest_level = 0;
char * prefix_parts[MAX_NEST];
int line = 1;
tern_node * head = NULL;
while ((curline = strtok_r(config_data, "\n", &state)))
{
config_data = NULL;
curline = strip_ws(curline);
int len = strlen(curline);
if (!len) {
continue;
}
if (curline[0] == '#') {
continue;
}
if (curline[0] == '}') {
if (!nest_level) {
fprintf(stderr, "unexpected } on line %d\n", line);
exit(1);
}
if (prefix) {
free(prefix);
prefix = NULL;
}
nest_level--;
curline = strip_ws(curline+1);
}
char * end = curline + len - 1;
if (*end == '{') {
*end = 0;
curline = strip_ws(curline);
prefix_parts[nest_level++] = curline;
if (prefix) {
free(prefix);
prefix = NULL;
}
} else {
if (nest_level && !prefix) {
prefix = alloc_concat_m(nest_level, prefix_parts);
}
char * val = strip_ws(split_keyval(curline));
char * key = curline;
if (*key) {
if (prefix) {
key = alloc_concat(prefix, key);
}
head = tern_insert_ptr(head, key, strdup(val));
if (prefix) {
free(key);
}
}
}
}
if (prefix) {
free(prefix);
}
return head;
}
tern_node * parse_config_file(char * config_path)
{
tern_node * ret = NULL;
FILE * config_file = fopen(config_path, "r");
if (!config_file) {
goto open_fail;
}
long config_size = file_size(config_file);
if (!config_size) {
goto config_empty;
}
char * config_data = malloc(config_size);
if (fread(config_data, 1, config_size, config_file) != config_size) {
goto config_read_fail;
}
ret = parse_config(config_data);
config_read_fail:
free(config_data);
config_empty:
fclose(config_file);
open_fail:
return ret;
}
char * readlink_alloc(char * path)
{
char * linktext = NULL;
ssize_t linksize = 512;
ssize_t cursize = 0;
do {
if (linksize > cursize) {
cursize = linksize;
if (linktext) {
free(linktext);
}
}
linktext = malloc(cursize);
linksize = readlink(path, linktext, cursize-1);
if (linksize == -1) {
perror("readlink");
free(linktext);
linktext = NULL;
}
} while (linksize > cursize);
return linktext;
}
tern_node * load_config(char * expath)
{
char * linktext;
char * home = getenv("HOME");
if (!home) {
goto load_in_app_dir;
}
char * path = alloc_concat(home, "/.config/blastem/blastem.cfg");
tern_node * ret = parse_config_file(path);
if (ret) {
goto success;
}
free(path);
load_in_app_dir:
linktext = readlink_alloc("/proc/self/exe");
if (!linktext) {
goto link_prob;
}
char * cur;
int linksize = strlen(linktext);
for(cur = linktext + linksize - 1; cur != linktext; cur--)
{
if (*cur == '/') {
*cur = 0;
break;
}
}
if (cur == linktext) {
goto link_prob;
}
path = alloc_concat(linktext, "/default.cfg");
ret = parse_config_file(path);
success:
return ret;
link_prob:
if (linktext) {
free(linktext);
}
no_proc:
//TODO: Fall back to using expath if /proc is not available
fputs("Failed to find a config file in ~/.config/blastem/blastem.cfg or in the blastem executable directory\n", stderr);
exit(1);
}
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