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UUENCODE.C
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C/C++ Source or Header
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1990-09-16
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2KB
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120 lines
/*
* Encode a file so it can be mailed to a remote system.
*
* USAGE:
* uuencode input [output]
*/
#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, *out;
struct stat sbuf;
int mode;
/* non-optional 1st argument */
if (argc > 1)
{
if ((in = fopen(argv[1], "r")) == NULL)
{
perror(argv[1]);
exit(1);
}
}
else
{
fprintf(stderr, "Usage: uuencode infile [outfile]\n");
exit(1);
}
/* optional 2nd argument */
if (argc > 2)
{
if ((out = fopen(argv[2], "w")) == NULL)
{
perror(argv[2]);
exit(1);
}
}
else
out = stdout;
/* figure out the input file mode */
fstat(fileno(in), &sbuf);
mode = sbuf.st_mode & 0777;
fprintf(out, "begin %o %s\n", mode, argv[1]);
encode(in, out);
fprintf(out, "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);
}