- reorganized project directory structure

[z80comp2] / emu / src / main.c

diff --git a/emu/src/main.c b/emu/src/main.c
new file mode 100644 (file)
index 0000000..54a3d3c
--- /dev/null
+++ b/emu/src/main.c
@@ -0,0 +1,149 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <signal.h>
+#include <unistd.h>
+#include <sched.h>
+#include <fcntl.h>
+#include <termios.h>
+#include <sys/stat.h>
+#include <sys/select.h>
+#include <sys/mman.h>
+#include "emu.h"
+
+static void sighandler(int s);
+static int parse_args(int argc, char **argv);
+
+static const char *rom_fname = "rom";
+static const char *termdev = "/dev/tty";
+
+static int ttyfd;
+static struct termios saved_term;
+static volatile int quit;
+
+int main(int argc, char **argv)
+{
+       void *rom;
+       int res, fd, maxfd;
+       struct stat st;
+       struct termios term;
+       fd_set rdset;
+       struct timeval tv = {0, 0};
+
+       if(parse_args(argc, argv) == -1) {
+               return 1;
+       }
+
+       if((fd = open(rom_fname, O_RDONLY)) == -1) {
+               fprintf(stderr, "failed to open ROM image: %s: %s\n", rom_fname, strerror(errno));
+               return -1;
+       }
+       fstat(fd, &st);
+
+       if((rom = mmap(0, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0)) == (void*)-1) {
+               fprintf(stderr, "failed to map ROM image\n");
+               return -1;
+       }
+
+       if((ttyfd = open(termdev, O_RDWR)) == -1) {
+               fprintf(stderr, "failed to open terminal device: %s: %s\n", termdev, strerror(errno));
+               return -1;
+       }
+       if(tcgetattr(ttyfd, &term) == -1) {
+               perror("failed to get terminal attributes");
+               return -1;
+       }
+       saved_term = term;
+       term.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IXON);
+       term.c_oflag &= ~OPOST;
+       term.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
+       term.c_cflag = (term.c_cflag & ~(CSIZE | PARENB)) | CS8;
+       term.c_cc[VMIN] = 0;
+       term.c_cc[VTIME] = 1;
+       tcsetattr(ttyfd, TCSAFLUSH, &term);
+
+       if(emu_init(rom, st.st_size) == -1) {
+               return 1;
+       }
+
+       signal(SIGINT, sighandler);
+       signal(SIGQUIT, sighandler);
+       signal(SIGTERM, sighandler);
+       signal(SIGSEGV, sighandler);
+       signal(SIGILL, sighandler);
+
+       while(!quit) {
+               FD_ZERO(&rdset);
+               FD_SET(ttyfd, &rdset);
+
+               maxfd = ttyfd;
+
+               res = select(maxfd + 1, &rdset, 0, 0, &tv);
+               if(quit) break;
+
+               if(res > 0) {
+                       if(FD_ISSET(ttyfd, &rdset)) {
+                               int i, rd;
+                               char buf[256];
+
+                               while((rd = read(ttyfd, buf, sizeof buf)) > 0) {
+                                       for(i=0; i<rd; i++) {
+                                               emu_serin(0, buf[i]);
+                                       }
+                               }
+                               if(!rd) break;  /* EOF */
+                       }
+               }
+
+               emu_step();
+               sched_yield();
+       }
+
+       emu_cleanup();
+
+       tcsetattr(ttyfd, TCSAFLUSH, &saved_term);
+       return 0;
+}
+
+void emu_serout(int port, int c)
+{
+       write(ttyfd, &c, 1);
+}
+
+static void sighandler(int s)
+{
+       quit = 1;
+}
+
+static int parse_args(int argc, char **argv)
+{
+       int i;
+
+       for(i=1; i<argc; i++) {
+               if(argv[i][0] == '-') {
+                       if(argv[i][2] == 0) {
+                               switch(argv[i][1]) {
+                               case 'r':
+                                       if(!argv[++i]) {
+                                               fprintf(stderr, "-r must be followed by a rom image file\n");
+                                               return -1;
+                                       }
+                                       rom_fname = argv[i];
+                                       break;
+
+                               default:
+                                       fprintf(stderr, "invalid option: %s\n", argv[i]);
+                                       return -1;
+                               }
+                       } else {
+                               fprintf(stderr, "invalid option: %s\n", argv[i]);
+                               return -1;
+                       }
+               } else {
+                       fprintf(stderr, "unexpected argument: %s\n", argv[i]);
+                       return -1;
+               }
+       }
+       return 0;
+}