Initial

uudecode/UUDECODE.CPP

@@ -0,0 +1,107 @@
+
+
+
+static int decode()
+{
+	extern int errno;
+	struct passwd *pw;
+	register int n;
+	register char ch, *p;
+	int mode, n1;
+	char buf[MAXPATHLEN];
+
+	/* search for header line */
+	do{
+		if(!fgets(buf,sizeof(buf),stdin))
+		{
+			(void)fprintf(stderr,"uudecode: %s: no \"begin\" line\n", filename);
+			return(1);
+		}
+	}while(strncmp(buf,"begin ",6));
+
+	(void)sscanf(buf,"begin %o %s",&mode,buf);
+	/* handle ~user/file format */
+	if(buf[0]=='~')
+	{
+		if(!(p=index(buf,'/')))
+		{
+		  (void)fprintf(stderr, "uudecode: %s: illegal ~user.\n",filename);
+			return(1);
+		}
+		*p++=NULL;
+		if(!(pw=getpwnam(buf+1)))
+		{
+			(void)fprintf(stderr,"uudecode: %s: no user %s.\n",filename,buf);
+			return(1);
+		}
+		n=strlen(pw->pw_dir);
+		n1=strlen(p);
+		if(n+n1+2>MAXPATHLEN)
+		{
+			(void)fprintf(stderr, "uudecode: %s: path too long.\n",filename);
+			return(1);
+		}
+		bcopy(p,buf+n+1,n1+1);
+		bcopy(pw->pw_dir,buf,n);
+		buf[n]='/';
+	}
+	/* create output file, set mode */
+	if(!freopen(buf,"w",stdout)||fchmod(fileno(stdout),mode&0666))
+	{
+		(void)fprintf(stderr,"uudecode: %s: %s: %s\n", buf,filename,strerror(errno));
+		return(1);
+	}
+	// for each input line
+	for(;;)
+	{
+		if(!fgets(p=buf,sizeof(buf),stdin))
+		{
+			(void)fprintf(stderr,"uudecode: %s: short file.\n",filename);
+			return(1);
+		}
+#define	DEC(c)	(((c) - ' ') & 077)		/* single character decode */
+//  '`n' is used to avoid writing out all the characters at the end of the file.
+		if((n=DEC(*p))<=0)break;
+		for(++p;n>0;p+=4,n-=3)
+			if(n>=3)
+			{
+				ch=DEC(p[0])<<2|DEC(p[1])>>4;
+				putchar(ch);
+				ch=DEC(p[1])<<4|DEC(p[2])>>2;
+				putchar(ch);
+				ch=DEC(p[2])<<6|DEC(p[3]);
+				putchar(ch);
+			}
+			else
+			{
+			  if(n>=1)
+				{
+					ch=DEC(p[0])<<2|DEC(p[1])>>4;
+					putchar(ch);
+				}
+				if(n>=2)
+				{
+					ch=DEC(p[1])<<4|DEC(p[2])>>2;
+					putchar(ch);
+				}
+				if(n>=3)
+				{
+					ch=DEC(p[2])<<6|DEC(p[3]);
+					putchar(ch);
+				}
+			}
+	}
+	if(!fgets(buf,sizeof(buf),stdin)||strcmp(buf,"end\n"))
+	{
+		(void)fprintf(stderr, "uudecode: %s: no \"end\" line.\n",filename);
+		return(1);
+	}
+	return(0);
+}
+
+static void
+usage()
+{
+	(void)fprintf(stderr, "usage: uudecode [file ...]\n");
+	exit(1);
+}