ddnet/src/engine/config.c

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#include <string.h>
#include <stdio.h>
#include <stdlib.h>
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#include "system.h"
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#include "config.h"
// buffered stream for reading lines, should perhaps be something smaller
typedef struct
{
char buffer[4*1024];
unsigned buffer_pos;
unsigned buffer_size;
unsigned buffer_max_size;
IOHANDLE io;
} LINEREADER;
void linereader_init(LINEREADER *lr, IOHANDLE io)
{
lr->buffer_max_size = 4*1024;
lr->buffer_size = 0;
lr->buffer_pos = 0;
lr->io = io;
}
char *linereader_get(LINEREADER *lr)
{
unsigned line_start = lr->buffer_pos;
while(1)
{
if(lr->buffer_pos >= lr->buffer_size)
{
// fetch more
// move the remaining part to the front
unsigned left = lr->buffer_size - line_start;
if(line_start > lr->buffer_size)
left = 0;
if(left)
mem_move(lr->buffer, &lr->buffer[line_start], left);
lr->buffer_pos = left;
// fill the buffer
unsigned read = io_read(lr->io, &lr->buffer[lr->buffer_pos], lr->buffer_max_size-lr->buffer_pos);
lr->buffer_size = left + read;
line_start = 0;
if(!read)
{
if(left)
{
lr->buffer[left] = 0; // return the last line
lr->buffer_pos = left;
lr->buffer_size = left;
return lr->buffer;
}
else
return 0x0; // we are done!
}
}
else
{
if(lr->buffer[lr->buffer_pos] == '\n' || lr->buffer[lr->buffer_pos] == '\r')
{
// line found
lr->buffer[lr->buffer_pos] = 0;
lr->buffer_pos++;
return &lr->buffer[line_start];
}
else
lr->buffer_pos++;
}
}
}
CONFIGURATION config;
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void config_reset()
{
#define MACRO_CONFIG_INT(name,def,min,max) config.name = def;
#define MACRO_CONFIG_STR(name,len,def) strncpy(config.name, def, len);
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#include "config_variables.h"
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#undef MACRO_CONFIG_INT
#undef MACRO_CONFIG_STR
}
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void strip_spaces(char **p)
{
char *s = *p;
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while (*s == ' ')
++s;
char *end = s + strlen(s);
while (end > s && *(end - 1) == ' ')
*--end = 0;
}
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void config_set(const char *line)
{
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const char *c = strchr(line, '=');
if (c)
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{
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char var[256];
char val[256];
strcpy(val, c+1);
mem_copy(var, line, c - line);
var[c - line] = 0;
char *var_str = var;
char *val_str = val;
strip_spaces(&var_str);
strip_spaces(&val_str);
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#define MACRO_CONFIG_INT(name,def,min,max) { if (strcmp(#name, var_str) == 0) config_set_ ## name (&config, atoi(val_str)); }
#define MACRO_CONFIG_STR(name,len,def) { if (strcmp(#name, var_str) == 0) { config_set_ ## name (&config, val_str); } }
#include "config_variables.h"
#undef MACRO_CONFIG_INT
#undef MACRO_CONFIG_STR
}
}
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void config_load(const char *filename)
{
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char full_path[1024];
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if (filename[0] == '~')
{
char *home = getenv("HOME");
if (home)
{
sprintf(full_path, "%s%s", home, filename+1);
filename = full_path;
}
}
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dbg_msg("config/load", "loading %s", filename);
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IOHANDLE file = io_open(filename, IOFLAG_READ);
if(file)
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{
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char *line;
LINEREADER lr;
linereader_init(&lr, file);
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while ((line = linereader_get(&lr)))
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config_set(line);
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io_close(file);
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}
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}
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void config_save(const char *filename)
{
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char full_path[1024];
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if (filename[0] == '~')
{
char *home = getenv("HOME");
if (home)
{
sprintf(full_path, "%s%s", home, filename+1);
filename = full_path;
}
}
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dbg_msg("config/save", "saving config to %s", filename);
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//file_stream file;
IOHANDLE file = io_open(filename, IOFLAG_WRITE);
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if(file)
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{
#if defined(CONF_FAMILY_WINDOWS)
const char newline[] = "\r\n";
#else
const char newline[] = "\n";
#endif
const int newline_len = sizeof(newline)-1;
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#define MACRO_CONFIG_INT(name,def,min,max) { char str[256]; sprintf(str, "%s=%i%s", #name, config.name, newline); io_write(file, str, strlen(str)); }
#define MACRO_CONFIG_STR(name,len,def) { io_write(file, #name, strlen(#name)); io_write(file, "=", 1); io_write(file, config.name, strlen(config.name)); io_write(file, newline, newline_len); }
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#include "config_variables.h"
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#undef MACRO_CONFIG_INT
#undef MACRO_CONFIG_STR
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io_close(file);
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}
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else
dbg_msg("config/save", "couldn't open %s for writing. :(", filename);
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}
#define MACRO_CONFIG_INT(name,def,min,max) int config_get_ ## name (CONFIGURATION *c) { return c->name; }
#define MACRO_CONFIG_STR(name,len,def) const char *config_get_ ## name (CONFIGURATION *c) { return c->name; }
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#include "config_variables.h"
#undef MACRO_CONFIG_INT
#undef MACRO_CONFIG_STR
#define MACRO_CONFIG_INT(name,def,min,max) void config_set_ ## name (CONFIGURATION *c, int val) { if (val < min) val = min; if (max != 0 && val > max) val = max; c->name = val; }
#define MACRO_CONFIG_STR(name,len,def) void config_set_ ## name (CONFIGURATION *c, const char *str) { strncpy(c->name, str, len-1); c->name[sizeof(c->name)-1] = 0; }
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#include "config_variables.h"
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#undef MACRO_CONFIG_INT
#undef MACRO_CONFIG_STR