tpemencode.c - plan9port - [fork] Plan 9 from user space
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       ---
       tpemencode.c (1004B)
       ---
            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, *cbuf;
           18         int fd;
           19         long n, tot;
           20         int len;
           21         char *tag, *file;
           22 
           23         ARGBEGIN{
           24         default:
           25                 usage();
           26         }ARGEND
           27 
           28         if(argc != 1 && argc != 2)
           29                 usage();
           30 
           31         tag = argv[0];
           32         if(argc == 2)
           33                 file = argv[1];
           34         else
           35                 file = "/dev/stdin";
           36 
           37         if((fd = open(file, OREAD)) < 0)
           38                 sysfatal("open %s: %r", file);
           39         buf = nil;
           40         tot = 0;
           41         for(;;){
           42                 buf = realloc(buf, tot+8192);
           43                 if(buf == nil)
           44                         sysfatal("realloc: %r");
           45                 if((n = read(fd, buf+tot, 8192)) < 0)
           46                         sysfatal("read: %r");
           47                 if(n == 0)
           48                         break;
           49                 tot += n;
           50         }
           51         buf[tot] = 0;
           52         cbuf = malloc(2*tot);
           53         if(cbuf == nil)
           54                 sysfatal("malloc: %r");
           55         len = enc64(cbuf, 2*tot, (uchar*)buf, tot);
           56         print("-----BEGIN %s-----\n", tag);
           57         while(len > 0){
           58                 print("%.64s\n", cbuf);
           59                 cbuf += 64;
           60                 len -= 64;
           61         }
           62         print("-----END %s-----\n", tag);
           63         exits(0);
           64 }