How do I create a UUDECODE program in C or c++

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// UUDECODE - a Win32 utility to uudecode single files.

// Copyright (C) 1998 Clem Dye

// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
Foundation, Inc.,
// 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

// Modified 13 July 2001 by Clem Dye to allow any character in the
range 0 to
// 7 in the 'begin' statement within the header of the uuencoded file
being
// decoded.


#include <stdio.h>
#include <string.h>
#define DEC(c) (((c) - ' ') & 077)
static char outname[200];
int ReadDataLine(FILE *f,char *buf)
{
int c,i;

i=0;
while ((c=fgetc(f)) != EOF) {
if (c == '\n') break;
if (c != '\r') {
buf[i++] = c;
}
}
buf[i] = 0;
return(c == EOF ? 0 : 1);
}

static char *uudecode (FILE *f)
{
register int n;
register char ch, *p;
char buf[2 * BUFSIZ];
FILE *out;

do {
if (!ReadDataLine(f,buf)) return(NULL);
}
while (strncmp(buf,"begin",5));
p = buf + 6;


while(*p && (strchr(" 01234567",*p))) p++;
//while (*p && (*p == ' '|| *p == '0' || *p == '6')) p++; // Clem
Dye, 13 July 2001.
strcpy(outname,p);
/* Create output file and set mode. */
out = fopen(outname,"wb");
/* For each input line: */
while (1)
{
if (!ReadDataLine(f,buf)) break;
if (!strncmp(buf,"end\r\n",5)) break;
p = buf;

/* N is used to avoid writing out all the characters at the end
of the file. */

n = DEC (*p);
if (n <= 0)
break;
for (++p; n > 0; p += 4, n -= 3)
{
if (n >= 3)
{
ch = DEC (p[0]) << 2 | DEC (p[1]) >> 4;
fputc(ch,out);
ch = DEC (p[1]) << 4 | DEC (p[2]) >> 2;
fputc (ch,out);
ch = DEC (p[2]) << 6 | DEC (p[3]);
fputc (ch,out);
}
else
{
if (n >= 1)
{
ch = DEC (p[0]) << 2 | DEC (p[1]) >> 4;
fputc (ch,out);
}
if (n >= 2)
{
ch = DEC (p[1]) << 4 | DEC (p[2]) >> 2;
fputc (ch,out);
}
}
}
}

fclose(out);
return outname;
}

int main(int argc,char *argv[])
{
FILE *f;

if (argc <= 1) {
printf("Usage: %s <input file>\n",argv[0]);
return(1);
}
f = fopen(argv[1],"rb");
if (f == NULL) {
printf("I can't find %s\n",argv[1]);
return(1);
}
uudecode(f);
fclose(f);
printf("Result decoded in %s\n",outname);
return(0);
}

Anonieko Ramos