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#include "dbg.h"
#include "env.h"
#include <fcntl.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
char *prog_name;
void print_usage(void)
{
printf("Simple x86 + DOS Emulator\n"
"\n"
"Usage: %s [options] <prog.exe> [args...] [-- environment vars]\n"
"\n"
"Options (processed before program name):\n"
" -h Show this help.\n"
" -b <addr> Load header-less binary at address.\n"
" -r <seg>:<ip> Specify a run address to start execution.\n"
" (only for binary loaded data).\n"
"\n"
"Environment variables:\n"
" %-18s Base name of a file to write the debug log, defaults to\n"
"\t\t the exe name if not given.\n"
" %-18s List of debug options to activate, from the following:\n"
"\t\t 'cpu', 'int', 'port', 'dos', 'video'.\n"
" %-18s DOS program name, if not given use the unix name.\n"
" %-18s DOS default (current) drive letter, if not given use 'C:'\n"
" %-18s DOS current working directory, use 'C:\\' if not given.\n"
" %-18s Set unix path as root of drive 'n', by default all drives\n"
"\t\t point to the unix working directory.\n"
". %-18s Set DOS code-page. Set to '?' to show lost of code-pages.\n",
prog_name, ENV_DBG_NAME, ENV_DBG_OPT, ENV_PROGNAME, ENV_DEF_DRIVE, ENV_CWD,
ENV_DRIVE "n", ENV_CODEPAGE);
exit(EXIT_SUCCESS);
}
void print_usage_error(const char *format, ...)
{
va_list ap;
fprintf(stderr, "%s: ", prog_name);
va_start(ap, format);
vfprintf(stderr, format, ap);
va_end(ap);
fprintf(stderr, "\nTry '%s -h' for more information.\n", prog_name);
exit(EXIT_FAILURE);
}
void print_error(const char *format, ...)
{
va_list ap;
fprintf(stderr, "%s: ", prog_name);
va_start(ap, format);
vfprintf(stderr, format, ap);
va_end(ap);
exit(EXIT_FAILURE);
}
static FILE *debug_files[debug_MAX];
static const char *debug_names[debug_MAX] = {"cpu", "int", "port", "dos", "video"};
static FILE *open_log_file(const char *base, const char *type)
{
char log_name[64 + strlen(base) + strlen(type)];
int fd = -1;
for(int i = 0; fd == -1 && i < 1000; i++)
{
sprintf(log_name, "%s-%s.%d.log", base, type, i);
fd = open(log_name, O_CREAT | O_EXCL | O_WRONLY, 0666);
}
if(fd == -1)
print_error("can't open debug log '%s'\n", log_name);
fprintf(stderr, "%s: %s debug log on file '%s'.\n", prog_name, type, log_name);
return fdopen(fd, "w");
}
void init_debug(const char *base)
{
if(getenv(ENV_DBG_NAME))
base = getenv(ENV_DBG_NAME);
if(getenv(ENV_DBG_OPT))
{
// Parse debug types:
const char *spec = getenv(ENV_DBG_OPT);
for(int i = 0; i < debug_MAX; i++)
{
if(strstr(spec, debug_names[i]))
debug_files[i] = open_log_file(base, debug_names[i]);
}
}
}
int debug_active(enum debug_type dt)
{
if(dt >= 0 && dt < debug_MAX)
return debug_files[dt] != 0;
else
return 0;
}
void debug(enum debug_type dt, const char *format, ...)
{
va_list ap;
if(debug_active(dt))
{
va_start(ap, format);
vfprintf(debug_files[dt], format, ap);
va_end(ap);
fflush(debug_files[dt]);
}
}
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