summaryrefslogtreecommitdiff
path: root/coreutils/uudecode.c
diff options
context:
space:
mode:
Diffstat (limited to 'coreutils/uudecode.c')
-rw-r--r--coreutils/uudecode.c70
1 files changed, 40 insertions, 30 deletions
diff --git a/coreutils/uudecode.c b/coreutils/uudecode.c
index 34a2239..4c619de 100644
--- a/coreutils/uudecode.c
+++ b/coreutils/uudecode.c
@@ -19,48 +19,57 @@ static void read_stduu(FILE *src_stream, FILE *dst_stream)
char *line;
while ((line = xmalloc_getline(src_stream)) != NULL) {
- int length;
- char *line_ptr = line;
+ int encoded_len, str_len;
+ char *line_ptr, *dst;
if (strcmp(line, "end") == 0) {
- return;
+ return; /* the only non-error exit */
}
- length = ((*line_ptr - 0x20) & 0x3f)* 4 / 3;
- if (length <= 0) {
+ line_ptr = line;
+ while (*line_ptr) {
+ *line_ptr = (*line_ptr - 0x20) & 0x3f;
+ line_ptr++;
+ }
+ str_len = line_ptr - line;
+
+ encoded_len = line[0] * 4 / 3;
+ /* Check that line is not too short. (we tolerate
+ * overly _long_ line to accomodate possible extra '`').
+ * Empty line case is also caught here. */
+ if (str_len <= encoded_len) {
+ break; /* go to bb_error_msg_and_die("short file"); */
+ }
+ if (encoded_len <= 0) {
/* Ignore the "`\n" line, why is it even in the encode file ? */
+ free(line);
continue;
}
- if (length > 60) {
+ if (encoded_len > 60) {
bb_error_msg_and_die("line too long");
}
- line_ptr++;
- /* Tolerate an overly long line to accomodate a possible exta '`' */
- if (strlen(line_ptr) < (size_t)length) {
- bb_error_msg_and_die("short file");
- }
-
- while (length > 0) {
+ dst = line;
+ line_ptr = line + 1;
+ do {
/* Merge four 6 bit chars to three 8 bit chars */
- fputc(((line_ptr[0] - 0x20) & 077) << 2 | ((line_ptr[1] - 0x20) & 077) >> 4, dst_stream);
- line_ptr++;
- length--;
- if (length == 0) {
+ *dst++ = line_ptr[0] << 2 | line_ptr[1] >> 4;
+ encoded_len--;
+ if (encoded_len == 0) {
break;
}
- fputc(((line_ptr[0] - 0x20) & 077) << 4 | ((line_ptr[1] - 0x20) & 077) >> 2, dst_stream);
- line_ptr++;
- length--;
- if (length == 0) {
+ *dst++ = line_ptr[1] << 4 | line_ptr[2] >> 2;
+ encoded_len--;
+ if (encoded_len == 0) {
break;
}
- fputc(((line_ptr[0] - 0x20) & 077) << 6 | ((line_ptr[1] - 0x20) & 077), dst_stream);
- line_ptr += 2;
- length -= 2;
- }
+ *dst++ = line_ptr[2] << 6 | line_ptr[3];
+ line_ptr += 4;
+ encoded_len -= 2;
+ } while (encoded_len > 0);
+ fwrite(line, 1, dst - line, dst_stream);
free(line);
}
bb_error_msg_and_die("short file");
@@ -129,7 +138,7 @@ static void read_base64(FILE *src_stream, FILE *dst_stream)
int uudecode_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int uudecode_main(int argc ATTRIBUTE_UNUSED, char **argv)
{
- FILE *src_stream = stdin;
+ FILE *src_stream;
char *outname = NULL;
char *line;
@@ -137,8 +146,9 @@ int uudecode_main(int argc ATTRIBUTE_UNUSED, char **argv)
getopt32(argv, "o:", &outname);
argv += optind;
- if (argv[0])
- src_stream = xfopen(argv[0], "r");
+ if (!*argv)
+ *--argv = (char*)"-";
+ src_stream = xfopen_stdin(*argv);
/* Search for the start of the encoding */
while ((line = xmalloc_getline(src_stream)) != NULL) {
@@ -159,7 +169,7 @@ int uudecode_main(int argc ATTRIBUTE_UNUSED, char **argv)
}
/* begin line found. decode and exit */
- mode = strtoul(line_ptr, NULL, 8);
+ mode = bb_strtou(line_ptr, NULL, 8);
if (outname == NULL) {
outname = strchr(line_ptr, ' ');
if ((outname == NULL) || (*outname == '\0')) {
@@ -170,7 +180,7 @@ int uudecode_main(int argc ATTRIBUTE_UNUSED, char **argv)
dst_stream = stdout;
if (NOT_LONE_DASH(outname)) {
dst_stream = xfopen(outname, "w");
- chmod(outname, mode & (S_IRWXU | S_IRWXG | S_IRWXO));
+ fchmod(fileno(dst_stream), mode & (S_IRWXU | S_IRWXG | S_IRWXO));
}
free(line);
decode_fn_ptr(src_stream, dst_stream);