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shell.c
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shell.c
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// This is an Academic Project, and was published after finishing the lecture.
// @author Joao Elvas @ FCT/UNL
#include "fs.h"
#include "disk.h"
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
int do_copyin( char *filename, char * myfs_name);
int do_copyout( char * myfs_name, char *filename );
int main( int argc, char *argv[] )
{
char line[1024];
char cmd[1024];
char arg1[1024];
char arg2[1024];
int result, args;
if(argc!=3) {
printf("use: %s <diskfile> <nblocks>\n",argv[0]);
return 1;
}
if(!disk_init(argv[1],atoi(argv[2]))) {
printf("couldn't initialize %s: %s\n",argv[1],strerror(errno));
return 1;
}
printf("opened emulated disk image %s with %d blocks\n",argv[1],disk_size());
while(1) {
printf(" prompt> ");
fflush(stdout);
if(!fgets(line,sizeof(line),stdin)) break;
if(line[0]=='\n') continue;
line[strlen(line)-1] = 0;
args = sscanf(line,"%s %s %s",cmd,arg1,arg2);
if(args==0) continue;
if(!strcmp(cmd,"format")) {
if(args==1) {
if(!fs_format()) {
printf("disk formatted.\n");
} else {
printf("format failed!\n");
}
} else {
printf("use: format\n");
}
} else if(!strcmp(cmd,"mount")) {
if(args==1) {
if(!fs_mount()) {
printf("disk mounted.\n");
} else {
printf("mount failed!\n");
}
} else {
printf("use: mount\n");
}
} else if(!strcmp(cmd,"debug")) {
if(args==1) {
fs_debug();
} else {
printf("use: debug\n");
}
} else if(!strcmp(cmd,"getsize")) {
if(args==2) {
result = fs_getsize(arg1);
if(result>=0) {
printf("file %s has size %d\n",arg1,result);
} else {
printf("getsize failed!\n");
}
} else {
printf("use: getsize <filename>\n");
}
} else if(!strcmp(cmd,"create")) {
if(args==2) {
result = fs_create(arg1);
if(result==0) {
printf("created file %s\n",arg1);
} else {
printf("create failed!\n");
}
} else {
printf("use: create <filename>\n");
}
} else if(!strcmp(cmd,"delete")) {
if(args==2) {
if(!fs_delete(arg1)) {
printf("file %s deleted.\n",arg1);
} else {
printf("delete failed!\n");
}
} else {
printf("use: delete <filename>\n");
}
} else if(!strcmp(cmd,"cat")) {
if(args==2) {
if(!do_copyout(arg1,"/dev/stdout")) {
printf("cat failed!\n");
}
} else {
printf("use: cat <name>\n");
}
} else if(!strcmp(cmd,"copyin")) {
if(args==3) {
if(do_copyin(arg1,arg2)) {
printf("copied file %s to %s\n",arg1,arg2);
} else {
printf("copy failed!\n");
}
} else {
printf("use: copyin <filename in host system> <filename in fs-miei-02>\n");
}
} else if(!strcmp(cmd,"copyout")) {
if(args==3) {
if(do_copyout(arg1,arg2)) {
printf("copied myfs_file %s to file %s\n", arg1,arg2);
} else {
printf("copy failed!\n");
}
} else {
printf("use: copyout <inumber> <filename>\n");
}
} else if(!strcmp(cmd,"help")) {
printf("Commands are:\n");
printf(" format\n");
printf(" mount\n");
printf(" debug\n");
printf(" create\n");
printf(" delete <filename>\n");
printf(" cat <filename>\n");
printf(" getsize <filename>\n");
printf(" copyin <file name in host system> <miei02-filename>\n");
printf(" copyout <miei02-filename> <file name in host system>\n");
printf(" dump <number_of_block_with_text_contents>\n");
printf(" help\n");
printf(" quit\n");
printf(" exit\n");
} else if(!strcmp(cmd,"quit")) {
break;
} else if(!strcmp(cmd,"exit")) {
break;
} else if (!strcmp(cmd, "dump")){
if(args==2) {
int blNo = atoi(arg1);
printf("Dumping disk block %d\n", blNo);
char b[4096];
disk_read( blNo, b);
printf("------------------------------\n");
printf("%s", b);
printf("\n------------------------------\n");
}
else {
printf("use: dump <block_number>\n");
}
} else {
printf("unknown command: %s\n",cmd);
printf("type 'help' for a list of commands.\n");
result = 1;
}
}
printf("closing emulated disk.\n");
disk_close();
return 0;
}
int do_copyin( char *filename, char *myfs_filename )
{
FILE *file;
int offset=0, result, actual;
char buffer[16384];
file = fopen(filename,"r");
if(!file) {
printf("couldn't open %s: %s\n",filename,strerror(errno));
return 0;
}
while(1) {
result = fread(buffer,1,sizeof(buffer),file);
if(result<=0) break;
if(result>0) {
actual = fs_write(myfs_filename,buffer,result,offset);
if(actual<0) {
printf("ERROR: fs_write return invalid result %d\n",actual);
break;
}
offset += actual;
if(actual!=result) {
printf("WARNING: fs_write only wrote %d bytes, not %d bytes\n",actual,result);
break;
}
}
}
printf("%d bytes copied\n",offset);
fclose(file);
return 1;
}
int do_copyout( char *myfs_filename, char *filename )
{
FILE *file;
int offset=0, result;
char buffer[16384];
if(strcmp(filename,"/dev/stdout"))
file = fopen(filename,"w");
else
file = stdout;
if(!file) {
printf("couldn't open %s: %s\n",filename,strerror(errno));
return 0;
}
while(1) {
result = fs_read(myfs_filename,buffer,sizeof(buffer),offset);
if(result<=0) break;
fwrite(buffer,1,result,file);
offset += result;
}
printf("%d bytes copied\n",offset);
if(file != stdout)
fclose(file);
return 1;
}