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#include <u.h>
#include <libc.h>
#include <bio.h>
Biobuf bin;
Biobuf bout;
int dflag;
char hex[] = "0123456789abcdef";
char Hex[] = "0123456789ABCDEF";
int
hexdigit(int c)
{
char *p;
if(c > 0){
if((p = strchr(Hex, c)) != 0)
return p - Hex;
if((p = strchr(hex, c)) != 0)
return p - hex;
}
return -1;
}
void
usage(void)
{
fprint(2, "Usage: %s [ -d ] [ file ]\n", argv0);
exits("usage");
}
void
main(int argc, char *argv[])
{
int c;
ARGBEGIN {
case 'd':
dflag = 1;
break;
default:
usage();
} ARGEND;
if(argc == 1){
int fd;
fd = open(*argv, OREAD);
if(fd < 0)
sysfatal("%r");
if(fd != 0) dup(fd, 0);
} else if(argc > 1)
usage();
Binit(&bin, 0, OREAD);
Binit(&bout, 1, OWRITE);
if(dflag){
while((c = Bgetc(&bin)) >= 0){
if(c == '%'){
int c1, c2, x1, x2;
if((c1 = Bgetc(&bin)) < 0)
break;
if((x1 = hexdigit(c1)) < 0){
Bungetc(&bin);
Bputc(&bout, c);
continue;
}
if((c2 = Bgetc(&bin)) < 0)
break;
if((x2 = hexdigit(c2)) < 0){
Bungetc(&bin);
Bputc(&bout, c);
Bputc(&bout, c1);
continue;
}
c = x1<<4 | x2;
} else if(c == '+')
c = ' ';
Bputc(&bout, c);
}
} else {
while((c = Bgetc(&bin)) >= 0){
if(c>0 && strchr("/$-_@.!*'(),", c)
|| 'a'<=c && c<='z'
|| 'A'<=c && c<='Z'
|| '0'<=c && c<='9')
Bputc(&bout, c);
else if(c == ' ')
Bputc(&bout, '+');
else {
Bputc(&bout, '%');
Bputc(&bout, Hex[c>>4]);
Bputc(&bout, Hex[c&15]);
}
}
}
Bflush(&bout);
exits(0);
}
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