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/*
* gbsplay is a Gameboy sound player
*
* 2003-2005,2008 (C) by Tobias Diedrich <ranma+gbsplay@tdiedrich.de>
* Christian Garbs <mitch@cgarbs.de>
* Licensed under GNU GPL.
*/
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <ctype.h>
#include <string.h>
#include <assert.h>
#include "common.h"
#include "cfgparser.h"
#include "plugout.h"
static long cfg_line, cfg_char;
static /*@null@*/ FILE *cfg_file;
static long nextchar_state;
static regparm char nextchar(void)
{
long c;
assert(cfg_file != NULL);
do {
if ((c = fgetc(cfg_file)) == EOF) return 0;
if (c == '\n') {
cfg_char = 0;
cfg_line++;
} else cfg_char++;
switch (nextchar_state) {
case 0:
if (c == '\\') nextchar_state = 1;
else if (c == '#') nextchar_state = 2;
break;
case 1:
nextchar_state = 0;
if (c == 'n') c = '\n';
break;
case 2:
if (c == 0 || c == '\n') nextchar_state = 0;
break;
}
} while (nextchar_state != 0);
return (char)c;
}
static long state;
static long nextstate;
static long c;
static const char *filename;
static regparm void err_expect(char *s)
{
fprintf(stderr, _("'%s' expected at %s line %ld char %ld.\n"),
s, filename, cfg_line, cfg_char);
c = nextchar();
state = 0;
nextstate = 1;
}
regparm void cfg_endian(void *ptr)
{
enum plugout_endian *endian = ptr;
c = tolower(c);
if (c != 'b' && c != 'l' && c!= 'n') {
err_expect("[bln]");
return;
}
switch (c) {
case 'b': *endian = PLUGOUT_ENDIAN_BIG; break;
case 'l': *endian = PLUGOUT_ENDIAN_LITTLE; break;
default: *endian = PLUGOUT_ENDIAN_NATIVE; break;
}
c = nextchar();
state = 0;
nextstate = 1;
}
regparm void cfg_string(void *ptr)
{
char s[200];
unsigned long n = 0;
if (!isalpha(c) && c != '-' && c != '_') {
err_expect("[a-zA-Z_-]");
return;
}
do {
s[n++] = c;
c = nextchar();
} while ((isalnum(c) || c == '-' || c == '_') &&
n < (sizeof(s)-1));
s[n] = 0;
*((char**)ptr) = strdup(s);
state = 0;
nextstate = 1;
}
regparm void cfg_long(void *ptr)
{
char num[20];
unsigned long n = 0;
if (!isdigit(c)) {
err_expect("[0-9]");
return;
}
do {
num[n++] = c;
c = nextchar();
} while (isdigit(c) &&
n < (sizeof(num)-1));
num[n] = 0;
*((long*)ptr) = atoi(num);
state = 0;
nextstate = 1;
}
regparm void cfg_parse(const char *fname, const struct cfg_option *options)
{
char option[200] = "";
filename = fname;
cfg_file = fopen(fname, "r");
if (cfg_file == NULL) return;
nextchar_state = 0;
state = 0;
nextstate = 1;
cfg_line = 1;
cfg_char = 0;
c = nextchar();
do {
unsigned long n;
switch (state) {
case 0:
if (isspace(c))
while (isspace(c = nextchar()));
state = nextstate;
break;
case 1:
n = 0;
if (!isalpha(c)) {
err_expect("[a-zA-Z]");
break;
}
do {
option[n++] = c;
c = nextchar();
} while ((isalnum(c) ||
c == '-' ||
c == '_') &&
n < (sizeof(option)-1));
option[n] = '\0';
state = 0;
nextstate = 2;
break;
case 2:
if (c != '=') {
err_expect("=");
break;
}
state = 0;
nextstate = 3;
c = nextchar();
break;
case 3:
n=0;
while (options[n].name != NULL &&
strcmp(options[n].name, option) != 0) n++;
if (options[n].parse_fn)
options[n].parse_fn(options[n].ptr);
else {
fprintf(stderr, _("Unknown option %s at %s line %ld.\n"), option, fname, cfg_line);
while ((c = nextchar()) != '\n' && c != 0);
state = 0;
nextstate = 1;
}
c = nextchar();
break;
}
} while (c != 0);
(void)fclose(cfg_file);
}
regparm char* get_userconfig(const char* cfgfile)
{
char *homedir, *usercfg;
long length;
homedir = getenv("HOME");
if (!homedir || !cfgfile) return NULL;
length = strlen(homedir) + strlen(cfgfile) + 2;
usercfg = malloc(length);
if (usercfg == NULL) {
fprintf(stderr, "%s\n", _("Memory allocation failed!"));
return NULL;
}
(void)snprintf(usercfg, length, "%s/%s", homedir, cfgfile);
return usercfg;
}
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