tpemdecode.c - plan9port - [fork] Plan 9 from user space
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       ---
       tpemdecode.c (953B)
       ---
            1 #include <u.h>
            2 #include <libc.h>
            3 #include <bio.h>
            4 #include <mp.h>
            5 #include <libsec.h>
            6 
            7 void
            8 usage(void)
            9 {
           10         fprint(2, "auth/pemdecode section [file]\n");
           11         exits("usage");
           12 }
           13 
           14 void
           15 main(int argc, char **argv)
           16 {
           17         char *buf;
           18         uchar *bin;
           19         int fd;
           20         long n, tot;
           21         int len;
           22         char *tag, *file;
           23 
           24         ARGBEGIN{
           25         default:
           26                 usage();
           27         }ARGEND
           28 
           29         if(argc != 1 && argc != 2)
           30                 usage();
           31 
           32         tag = argv[0];
           33         if(argc == 2)
           34                 file = argv[1];
           35         else
           36                 file = "/dev/stdin";
           37 
           38         if((fd = open(file, OREAD)) < 0)
           39                 sysfatal("open %s: %r", file);
           40         buf = nil;
           41         tot = 0;
           42         for(;;){
           43                 buf = realloc(buf, tot+8192);
           44                 if(buf == nil)
           45                         sysfatal("realloc: %r");
           46                 if((n = read(fd, buf+tot, 8192)) < 0)
           47                         sysfatal("read: %r");
           48                 if(n == 0)
           49                         break;
           50                 tot += n;
           51         }
           52         buf[tot] = 0;
           53         bin = decodepem(buf, tag, &len, nil);
           54         if(bin == nil)
           55                 sysfatal("cannot extract section '%s' from pem", tag);
           56         if((n=write(1, bin, len)) != len)
           57                 sysfatal("writing %d bytes got %ld: %r", len, n);
           58         exits(0);
           59 }