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uuencode.c
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C/C++ Source or Header
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1990-12-29
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3KB
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165 lines
/* #ifndef lint
static char sccsid[] = "@(#)uuencode.c 5.3-1 (Berkeley) 9/16/87";
#endif */
/* Written by Mark Horton */
/* Modified by ajr (Alan J Rosenthatl,flaps@utcsri.UUCP) to use checksums */
/* Modified by fnf (Fred Fish,well!fnf) to use Keith Pyle's suggestion for
compatibility */
/* Modified by bcn (Bryce Nesbitt,ucbvax!hoser!bryce) to enable CTRL-C for
Amiga Lattice C. Added a transparent file size trailer for later check.
Changed fopen from "r" to "rb" for Messy-dos machines (thanks to Andrew
Wylie) */
/*
* uuencode >outfile [infile] name
*
* Encode a file so it can be mailed to a remote system. This version
* transparantly adds line checksums and a file size for sanity checks.
*
*/
#include <stdio.h>
#ifdef AMIGA /* Amiga Lattice C */
#define AMIGA_LATTICE
#define MCH_AMIGA
#define MPU68000
#endif
#ifdef unix
#include <sys/types.h>
#include <sys/stat.h>
#endif
#define SUMSIZE 64 /* 6 bits */
/* ENC is the basic 1 character encode function to make a char printing */
/* Each output character represents 6 bits of input */
#define ENC(c) ((c) ? ((c) & 077) + ' ': '`')
long totalsize=0; /* Used to count the file size because ftell() does
not return sane results for pipes */
main(argc, argv)
char **argv;
{
FILE *in;
int mode;
#ifdef unix
struct stat sbuf;
#endif
#ifdef AMIGA_LATTICE
extern int Enable_Abort; /* Enable CTRL-C for Lattice */
Enable_Abort=1;
#endif
/* optional 1st argument */
if (argc > 2) {
if ((in = fopen(argv[1], "r")) == NULL) {
fprintf(stderr, "ERROR: can't find %s\n", argv[1]);
fprintf(stderr, "USAGE: uuencode >outfile [infile] name\n");
exit(10);
}
argv++; argc--;
} else
in = stdin;
if (argc != 2) {
fprintf(stderr, "USAGE: uuencode >outfile [infile] name\n");
exit(11);
}
#ifdef unix
/* figure out the input file mode */
fstat(fileno(in), &sbuf);
mode = sbuf.st_mode & 0777;
#else
mode = 0644; /* Default permissions */
#endif
printf("\nbegin %o %s\n", mode, argv[1]);
encode(in, stdout);
printf("end\n");
printf("size %ld\n",totalsize);
exit(0);
}
/*
* copy from in to out, encoding as you go along.
*/
encode(in, out)
FILE *in;
FILE *out;
{
#ifndef unix
extern errno;
#endif
char buf[80];
int i, n, checksum;
for (;;) {
/* 1 (up to) 45 character line */
n = fr(in, buf, 45);
putc(ENC(n), out);
checksum = 0;
for (i=0; i<n; i += 3)
checksum = (checksum+outdec(&buf[i], out)) % SUMSIZE;
putc(ENC(checksum), out);
putc('\n', out);
#ifndef unix
/* Error checking under UNIX?? You must be kidding! */
if (errno) {
fprintf(stderr, "ERROR: error writing to output\n");
exit(12);
}
#endif
if (n <= 0)
break;
}
}
/*
* output one group of 3 bytes, pointed at by p, on file f.
* return the checksum increment.
*/
int 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);
return((p[0]+p[1]+p[2]) % SUMSIZE);
}
/* 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);
totalsize++;
buf[i] = c;
}
return (cnt);
}