/* * Reads gopher output from a TCP port, outputs * html on standard output. * Usage: gopher2html gopher-string * where gopher-string is the string sent to * the gopher server to get the document. * * Gopher protocol is described in rfc1436 */ #include #include char *cmd; int ifd; void errexit(char *s, ...){ static char buf[1024]; char *out; va_list args; va_start(args, s); out = doprint(buf, buf+sizeof(buf), s, args); va_end(args); *out='\0'; print("%s error\n", cmd); print("

%s error

\n", cmd); print("%s\n", buf); exits("gopher error"); } void wtext(char *buf, char *ebuf){ char *bp; for(bp=buf;bp!=ebuf;bp++){ if(*bp=='<' || *bp=='>' || *bp=='&' || *bp=='"'){ if(bp!=buf) write(1, buf, bp-buf); buf=bp+1; switch(*bp){ case '<': print("<"); break; case '>': print(">"); break; case '&': print("&"); break; case '"': print("""); break; } } } if(bp!=buf) write(1, buf, bp-buf); } void savefile(char *name, char *type){ int fd, n; char save[30], buf[1024]; for(n=1;;n++){ if(n==100) errexit("can't save binary file %s: %r", name); sprint(save, "gopher.save.%d", n); fd=create(save, OWRITE, 0444); if(fd!=-1) break; } print("%s

%s

\n", name); print("Saving %s file %s in %s...\n", type, name, save); while((n=read(ifd, buf, sizeof buf))>0) write(fd, buf, n); close(fd); print("done\n"); } void copyfile(char *title){ char buf[1024]; int n; print("%s\n", title); print("

%s

\n", title);
	while((n=read(ifd, buf, sizeof buf))>0) wtext(buf, buf+n);
	print("

\n"); } /* * A directory entry contains * type name selector host port * all tab separated, except type and name (type is one character) */ char ibuf[1024], *ibp, *eibuf; #define EOF (-1) int get(void){ int n; Again: if(ibp==eibuf){ n=read(ifd, ibuf, sizeof(ibuf)); if(n<=0) return EOF; eibuf=ibuf+n; ibp=ibuf; } if(*ibp=='\r'){ ibp++; goto Again; } return *ibp++&255; } char *escape(char *in){ static char out[516]; char *op, *eop; eop=out+512; op=out; for(;*in;in++){ if(op%s\n", title); print("

%s

"); wtext(name, ename); break; case '7': print("
", host, port, type, escape(selector)); wtext(name, ename); break; default: print("
", host, port, type, escape(selector)); wtext(name, ename); print("\n"); break; } } print("

\n"); } int hexdigit(int c){ if('0'<=c && c<='9') return c-'0'; if('a'<=c && c<='f') return c-'a'+10; if('A'<=c && c<='F') return c-'A'+10; return -1; } void unescape(char *s){ char *t; int hi, lo; t=s; while(*s){ if(*s=='%' && (hi=hexdigit(s[1]))>=0 && (lo=hexdigit(s[2]))>=0){ *t++=hi*16+lo; s+=3; } else *t++=*s++; } *t='\0'; } void main(int argc, char *argv[]){ char dialstr[1024]; char *name; cmd=argv[0]; if(argc!=4) errexit("Usage: %s host port selector", argv[0]); sprint(dialstr, "tcp!%s!%s", argv[1], argv[2]); ifd=dial(dialstr, 0, 0, 0); if(ifd==-1) errexit("can't call %s:%s", argv[1], argv[2]); unescape(argv[3]); switch(argv[3][0]){ case '/': fprint(ifd, "\r\n"); copydir(argv[3]); break; case '\0': fprint(ifd, "\r\n"); copydir(argv[1]); break; case '7': /* index query */ name=strchr(argv[3], '?'); if(name!=0){ if(name==argv[3]+1){ argv[3][1]=argv[3][0]; argv[3]++; } else *name='\t'; name++; } else name=argv[3]; fprint(ifd, "%s\r\n", argv[3]+1); copydir(name); break; default: fprint(ifd, "%s\r\n", argv[3]+1); name=strrchr(argv[3], '/'); if(name==0) name=argv[3]; else name++; switch(argv[3][0]){ default: errexit("sorry, can't handle %s (type %c)", argv[3]+1, argv[3][0]); case '0': copyfile(name); break; case '1': copydir(name); break; case '4': savefile(name, "Macintosh BINHEX"); break; case '5': savefile(name, "DOS binary"); break; case '6': savefile(name, "uuencoded"); break; case '9': savefile(name, "binary"); break; case 'g': savefile(name, "GIF"); break; case 'I': savefile(name, "some sort of image"); break; } break; } exits(0); }