Simplify uudecode(1) and fix some bugs

This commit is contained in:
sin 2014-02-04 14:30:17 +00:00
parent 7008d751b2
commit 4d8c3d4dc2

View File

@ -10,9 +10,9 @@
#include "util.h"
#include "text.h"
static int uudecode(FILE *, FILE*);
static int checkheader(FILE *, const char *, mode_t *, char **, char **);
static int checkmode(const char *, mode_t *);
static void uudecode(FILE *, FILE *);
static void checkheader(FILE *, const char *, const char *, mode_t *, char **);
static void checkmode(const char *, mode_t *);
static FILE *checkfile(const char *);
static void
@ -25,9 +25,8 @@ int
main(int argc, char *argv[])
{
FILE *fp, *nfp;
char *fname, *headerr;
char *fname;
mode_t mode = 0;
int chmodtest;
ARGBEGIN {
case 'm':
@ -40,44 +39,28 @@ main(int argc, char *argv[])
usage();
if (argc == 0) {
if (checkheader(stdin, "begin ", &mode, &fname, &headerr) < 0)
eprintf("%s\n",headerr);
checkheader(stdin, "<stdin>", "begin ", &mode, &fname);
nfp = checkfile(fname);
if (nfp == NULL)
eprintf("fopen %s:", fname);
if (uudecode(stdin, nfp) < 0)
goto fail;
uudecode(stdin, nfp);
fclose(nfp);
} else {
if (!(fp = fopen(argv[0], "r")))
eprintf("fopen %s:", argv[0]);
if (checkheader(fp, "begin ", &mode, &fname, &headerr) < 0) {
fclose(fp);
eprintf("%s\n",headerr);
}
checkheader(fp, argv[0], "begin ", &mode, &fname);
nfp = checkfile(fname);
if (nfp == NULL) {
fclose(fp);
eprintf("fopen %s:", fname);
}
if (uudecode(fp, nfp) < 0) {
uudecode(fp, nfp);
fclose(fp);
goto fail;
}
}
chmodtest=fchmod(fileno(nfp),mode);
fclose(fp);
fclose(nfp);
if (chmodtest == -1)
eprintf("chmod %s:%s",fname,strerror(errno));
if (fchmod(fileno(nfp), mode) < 0)
eprintf("chmod %s:", fname);
return EXIT_SUCCESS;
fail:
fclose(nfp);
return EXIT_FAILURE;
}
static FILE *
@ -85,18 +68,17 @@ checkfile(const char *fname)
{
struct stat st;
int ret;
if (strcmp(fname,"/dev/stdout") == 0)
return stdout;
ret = lstat(fname, &st);
/* if it is a new file, try to open it */
if (ret < 0 && errno == ENOENT)
goto tropen; /* new file, try to open it */
goto tropen;
if (ret < 0) {
weprintf("stat: %s:", fname);
weprintf("lstat %s:", fname);
return NULL;
}
if (!S_ISREG(st.st_mode)) {
weprintf("for safety uudecode operates only on regular files and /dev/stdout\n");
return NULL;
@ -105,54 +87,45 @@ tropen:
return fopen(fname,"w");
}
static int
checkheader(FILE *fp, const char *header, mode_t *mode, char **fname, char **headerr)
static void
checkheader(FILE *fp, const char *s, const char *header, mode_t *mode, char **fname)
{
char bufs[PATH_MAX + 11]; /* len header + mode + maxname */
char *p, *q, *bufp = NULL;
char *p, *q;
size_t n;
fgets(bufs, sizeof(bufs), fp);
if (bufp == NULL || bufp == '\0') { /* empty or null str */
*headerr = "empty or null header string";
return -1;
}
if ((p = strchr(bufs, '\n')) == NULL) { /* line too long or last line on file */
*headerr = "header string too long or non-newline terminated file";
return -1;
if (fgets(bufs, sizeof(bufs), fp) == NULL) {
if (ferror(fp))
eprintf("%s: read error:", s);
else
eprintf("empty or null header string\n");
}
if ((p = strchr(bufs, '\n')) == NULL)
eprintf("header string too long or non-newline terminated file\n");
p = bufs;
if (strncmp(bufs, header, strlen(header)) != 0) {
*headerr = "malformed header prefix";
return -1;
}
if (strncmp(bufs, header, strlen(header)) != 0)
eprintf("malformed header prefix\n");
p += strlen(header);
if ((q = strchr(p, ' ')) == NULL) { /* malformed mode */
*headerr = "malformed mode string in header";
return -1;
}
*q++ = '\0'; /* now mode should be null terminated,q points to fname */
if (checkmode(p,mode) < 0) { /* error from checkmode */
*headerr = "invalid mode in header";
return -1;
}
if ((q = strchr(p, ' ')) == NULL)
eprintf("malformed mode string in header\n");
*q++ = '\0';
/* now mode should be null terminated, q points to fname */
checkmode(p,mode);
n = strlen(q);
while (n > 0 && (q[n-1] == '\n' || q[n-1] == '\r'))
q[--n] = '\0';
if (n > 0)
*fname = q;
return 1;
}
static int
static void
checkmode(const char *str,mode_t *validmode)
{
char *end;
int octal;
if (str == NULL || str == '\0')
return -1; /* null str */
eprintf("invalid mode\n");
octal = strtol(str, &end, 8);
if (*end == '\0') { /* successful conversion from a valid str */
@ -170,36 +143,32 @@ checkmode(const char *str,mode_t *validmode)
if(octal & 00002) *validmode |= S_IWOTH;
if(octal & 00001) *validmode |= S_IXOTH;
*validmode &= 07777;
return 1;
}
}
return -1; /* malformed mode */
}
static int
static void
uudecode(FILE *fp, FILE *outfp)
{
char *bufb=NULL, *p,*nl;
size_t n=0;
int ch , i;
#define DEC(c) (((c) - ' ') & 077) /* single character decode */
#define IS_DEC(c) ( (((c) - ' ') >= 0) && (((c) - ' ') <= 077 + 1) )
#define OUT_OF_RANGE(c) do { \
weprintf("character %c out of range: [%d-%d]",(c), 1+' ',077+' '+1); \
return -1; \
eprintf("character %c out of range: [%d-%d]",(c), 1+' ',077+' '+1); \
} while (0)
while (afgets(&bufb,&n,fp)) {
p = bufb;
if ((nl=strchr(bufb, '\n')) != NULL) { /* trim newlines */
/* trim newlines */
if ((nl=strchr(bufb, '\n')) != NULL)
*nl = '\0';
} else {
weprintf("no newline found, aborting\n");
return -1;
}
else
eprintf("no newline found, aborting\n");
if ((i = DEC(*p)) <= 0) /* check for last line */
break;
for (++p; i > 0; p += 4, i -= 3) {
if (i >= 3) {
if (!(IS_DEC(*p) && IS_DEC(*(p + 1)) &&
@ -230,16 +199,11 @@ uudecode(FILE *fp, FILE *outfp)
}
}
}
if (ferror(fp)) {
weprintf("read error");
return -1;
}
if (ferror(fp))
eprintf("read error:");
}
/* check for end or fail */
afgets(&bufb,&n,fp);
if (strnlen(bufb,3) < 3 || strncmp(bufb, "end", 3) != 0 || bufb[3] != '\n') {
weprintf("valid uudecode footer \"end\" not found\n");
return -1;
}
return 1;
if (strnlen(bufb,3) < 3 || strncmp(bufb, "end", 3) != 0 || bufb[3] != '\n')
eprintf("valid uudecode footer \"end\" not found\n");
}