BSD 4_2 release

[unix-history] / usr / src / usr.bin / uucp / uuencode.c

#ifndef lint
static char sccsid[] = "@(#)uuencode.c  5.1 (Berkeley) 7/2/83";
#endif

/*
* uuencode [input] output
*
* Encode a file so it can be mailed to a remote system.
*/
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>

/* ENC is the basic 1 character encoding function to make a char printing */
#define ENC(c) (((c) & 077) + ' ')

main(argc, argv)
char **argv;
{
       FILE *in;
       struct stat sbuf;
       int mode;

       /* optional 1st argument */
       if (argc > 2) {
               if ((in = fopen(argv[1], "r")) == NULL) {
                       perror(argv[1]);
                       exit(1);
               }
               argv++; argc--;
       } else
               in = stdin;

       if (argc != 2) {
               printf("Usage: uuencode [infile] remotefile\n");
               exit(2);
       }

       /* figure out the input file mode */
       fstat(fileno(in), &sbuf);
       mode = sbuf.st_mode & 0777;
       printf("begin %o %s\n", mode, argv[1]);

       encode(in, stdout);

       printf("end\n");
       exit(0);
}

/*
* copy from in to out, encoding as you go along.
*/
encode(in, out)
FILE *in;
FILE *out;
{
       char buf[80];
       int i, n;

       for (;;) {
               /* 1 (up to) 45 character line */
               n = fr(in, buf, 45);
               putc(ENC(n), out);

               for (i=0; i<n; i += 3)
                       outdec(&buf[i], out);

               putc('\n', out);
               if (n <= 0)
                       break;
       }
}

/*
* output one group of 3 bytes, pointed at by p, on file f.
*/
outdec(p, f)
char *p;
FILE *f;
{
       int c1, c2, c3, c4;

       c1 = *p >> 2;
       c2 = (*p << 4) & 060 | (p[1] >> 4) & 017;
       c3 = (p[1] << 2) & 074 | (p[2] >> 6) & 03;
       c4 = p[2] & 077;
       putc(ENC(c1), f);
       putc(ENC(c2), f);
       putc(ENC(c3), f);
       putc(ENC(c4), f);
}

/* fr: like read but stdio */
int
fr(fd, buf, cnt)
FILE *fd;
char *buf;
int cnt;
{
       int c, i;

       for (i=0; i<cnt; i++) {
               c = getc(fd);
               if (c == EOF)
                       return(i);
               buf[i] = c;
       }
       return (cnt);
}