发信人: i_can()
整理人: wenbobo(2002-12-27 15:50:04), 站内信件
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#ifndef lint
static char sccsid[] = "@(#)uudecode.c 5.5 (Berkeley) 7/6/88";
#endif /* not lint */
#ifdef __MSDOS__ /* For Turbo C */
#define MSDOS 1
#endif
/*
* uudecode [input]
*
* create the specified file, decoding as you go.
* used with uuencode.
*/
#include <stdio.h>
#ifdef WIN32
# include <stdlib.h>
# include <string.h>
# include <sys/types.h>
# include <sys/stat.h>
# define MSDOS 1
#else /* Not WIN32 */
# ifdef VMS
# include <types.h>
# include <stat.h>
# else
# ifndef MSDOS /* i.e., UNIX */
# include <pwd.h>
# endif
# include <sys/types.h> /* MSDOS or UNIX */
# include <sys/stat.h>
# endif
#endif /* Not WIN32 */
/* single-character decode */
#define DEC(c) (((c) - ' ') & 077)
main(argc, argv)
char **argv;
{
void decode();
FILE *in, *out;
int mode;
#ifdef WIN32
char dest[512];
#else
char dest[128];
#endif
char buf[80];
/* optional input arg */
if (argc > 1) {
if ((in = fopen(argv[1], "r")) == NULL) {
perror(argv[1]);
return 1;
}
argv++; argc--;
} else
in = stdin;
if (argc != 1) {
printf("Usage: uudecode [infile]\n");
return 2;
}
/* search for header line */
for (;;) {
if (fgets(buf, sizeof buf, in) == NULL) {
fprintf(stderr, "No begin line\n");
return 3;
}
if (strncmp(buf, "begin ", 6) == 0)
break;
}
(void)sscanf(buf, "begin %o %s", &mode, dest);
#if !defined(MSDOS) && !defined(VMS) /* i.e., UNIX */
/* handle ~user/file format */
if (dest[0] == '~') {
char *sl;
struct passwd *getpwnam();
struct passwd *user;
char dnbuf[100], *index(), *strcat(), *strcpy();
sl = index(dest, '/');
if (sl == NULL) {
fprintf(stderr, "Illegal ~user\n");
return 3;
}
*sl++ = 0;
user = getpwnam(dest+1);
if (user == NULL) {
fprintf(stderr, "No such user as %s\n", dest);
return 4;
}
strcpy(dnbuf, user->pw_dir);
strcat(dnbuf, "/");
strcat(dnbuf, sl);
strcpy(dest, dnbuf);
}
#endif /* !defined(MSDOS) && !defined(VMS) */
/* create output file */
#ifdef MSDOS
out = fopen(dest, "wb"); /* Binary file */
#else
out = fopen(dest, "w");
#endif
if (out == NULL) {
perror(dest);
return 4;
}
#if !defined(MSDOS) && !defined(VMS) /* i.e., UNIX */
chmod(dest, mode);
#endif
decode(in, out);
if (fgets(buf, sizeof buf, in) == NULL || strcmp(buf, "end\n")
) {
fprintf(stderr, "No end line\n");
return 5;
}
return 0;
}
/*
* copy from in to out, decoding as you go along.
*/
void
decode(in, out)
FILE *in;
FILE *out;
{
void outdec();
char buf[80];
char *bp;
int n, i, expected;
for (;;) {
/* for each input line */
if (fgets(buf, sizeof buf, in) == NULL) {
printf("Short file\n");
exit(10);
}
n = DEC(buf[0]);
if ((n <= 0) || (buf[0] == '\n'))
break;
/* Calculate expected # of chars and pad if necessary
*/
expected = ((n+2)/3)<<2;
for (i = strlen(buf)-1; i <= expected; i++) buf[i] = '
';
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.
*/
void
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);
}
/*
* Return the ptr in sp at which the character c appears;
* NULL if not found
*/
#ifndef NULL
# define NULL 0
#endif
char *
index(sp, c)
register char *sp, c;
{
do {
if (*sp == c)
return(sp);
} while (*sp++);
return(NULL);
}
--
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