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astuud.c
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C/C++ Source or Header
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1986-06-19
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4KB
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153 lines
/*
* Uudecode -- decode a uuencoded file back to binary form.
*
* Slightly modified from a version posted to net.sources once;
* suitable for compilation on an IBM PC.
*
* modified for Lattice C on the ST - 11.05.86 by MSD
*
*/
#include <stdio.h>
#include <osbind.h>
char *Progname = "UUDECODE";
#define USAGE "Usage: UUDECODE [file]\n"
/* single character decode */
#define DEC(c) (((c) - ' ') & 077)
FILE *in, *out, *efopen(), *fopen();
main(argc, argv)
int argc; char *argv[];
{
int mode;
char dest[128];
char buf[80];
/* optional input arg */
if (argc > 1) {
in = efopen(argv[1], "r");
argv++; argc--;
}
else
in = stdin;
if (argc != 1) {
fprintf(stderr, USAGE);
exit(2);
}
/* search for header line */
for (;;) {
if (fgets(buf, sizeof buf, in) == NULL) {
fprintf(stderr, "No begin line\n");
exit(3);
}
if (strncmp(buf, "begin ", 6) == 0)
break;
}
sscanf(buf, "begin %o %s", &mode, dest);
out = efopen(dest, "wb"); /* create output file - binary output !!! */
decode(in, out);
fclose(out);
if (fgets(buf, sizeof buf, in) == NULL || strcmp(buf, "end\n")) {
fprintf(stderr, "No end line\n");
exit(5);
}
}
/*
* copy from in to out, decoding as you go along.
*/
decode(in, out)
FILE *in, *out;
{
char buf[80];
char *bp;
int n;
for (;;) {
if (fgets(buf, sizeof buf, in) == NULL) {
fprintf(stderr, "Short file\n");
break;
}
n = DEC(buf[0]);
if (n <= 0)
break;
bp = &buf[1];
while (n > 0) {
outdec(bp, out, n);
bp += 4;
n -= 3;
}
}
}
/*
* output a group of 3 bytes (4 input characters).
* the input chars are pointed to by p, they are to
* be output to file f. n is used to tell us not to
* output all of them at the end of the file.
*/
outdec(p, f, n)
char *p; FILE *f; int n;
{
int c1, c2, c3;
c1 = DEC(*p) << 2 | DEC(p[1]) >> 4;
c2 = DEC(p[1]) << 4 | DEC(p[2]) >> 2;
c3 = DEC(p[2]) << 6 | DEC(p[3]);
if (n >= 1)
putc(c1, f);
if (n >= 2)
putc(c2, f);
if (n >= 3)
putc(c3, 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);
}
/* If your library already has this function, use it and nuke the code below */
/* Open a file, aborting on failure */
/* Written by Bernie Roehl, June 1985 */
FILE *
efopen(fn, mode)
char *fn, *mode;
{
FILE *unit;
if ((unit = fopen(fn, mode)) == NULL)
error("Cannot open file %s", fn);
else
return unit;
}
extern char *Progname;
error(s1, s2)
char *s1, *s2;
{
fprintf(stderr, "%s: ", Progname);
fprintf(stderr, s1, s2);
exit(1);
}