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Diffstat (limited to 'toys/pending/cpio.c')
-rw-r--r--toys/pending/cpio.c53
1 files changed, 19 insertions, 34 deletions
diff --git a/toys/pending/cpio.c b/toys/pending/cpio.c
index 802dc33a..e0ed8e85 100644
--- a/toys/pending/cpio.c
+++ b/toys/pending/cpio.c
@@ -24,12 +24,13 @@ config CPIO
newc SVR4 new character format (default)
-F ARCHIVE read from or write to ARCHIVE
*/
+
#define FOR_cpio
#include "toys.h"
GLOBALS(
-char * archive;
-char * fmt;
+ char *archive;
+ char *fmt;
)
/* Iterate through a list of files, read from stdin.
@@ -41,11 +42,11 @@ void loopfiles_stdin(void (*function)(int fd, char *name, struct stat st))
struct stat st;
char *name = toybuf;
- while (name != NULL){
+ while (name) {
memset(toybuf, 0, sizeof(toybuf));
name = fgets(toybuf, sizeof(toybuf) - 1, stdin);
- if (name != NULL) {
+ if (name) {
if (toybuf[strlen(name) - 1] == '\n' ) {
toybuf[strlen(name) - 1 ] = '\0';
if (lstat(name, &st) == -1) continue;
@@ -98,7 +99,7 @@ void write_cpio_member(int fd, char *name, struct stat buf)
major(buf.st_rdev), minor(buf.st_rdev), nlen);
write(1, hdr, sizeof(struct newc_header));
write(1, name, nlen);
- if ((nlen + 2) % 4) write(1, &n, 4 - ((nlen + 2) % 4));
+ if ((nlen + 2) & 3) write(1, &n, 4 - ((nlen + 2) & 3));
if (S_ISLNK(buf.st_mode)) {
ssize_t llen = readlink(name, toybuf, sizeof(toybuf) - 1);
if (llen > 0) {
@@ -109,10 +110,10 @@ void write_cpio_member(int fd, char *name, struct stat buf)
for (; (lseek(fd, 0, SEEK_CUR) < (uint32_t)(buf.st_size));) {
out = read(fd, toybuf, sizeof(toybuf));
if (out > 0) write(1, toybuf, out);
- if (errno || out < sizeof(toybuf)) break;
+ if (errno || out < sizeof(toybuf)) break;
}
}
- if (buf.st_size % 4) write(1, &n, 4 - (buf.st_size % 4));
+ if (buf.st_size & 3) write(1, &n, 4 - (buf.st_size & 3));
}
//convert hex to uint; mostly to allow using bits of non-terminated strings
@@ -150,10 +151,7 @@ unsigned int htou(char * hex)
return ret;
}
-/* Read one cpio record.
- * Returns 0 for last record,
- * 1 for "continue".
- */
+// Read one cpio record. Returns 0 for last record, 1 for "continue".
int read_cpio_member(int fd, int how)
{
uint32_t nsize, fsize;
@@ -165,18 +163,17 @@ int read_cpio_member(int fd, int how)
xreadall(fd, &hdr, sizeof(struct newc_header));
nsize = htou(hdr.c_namesize);
- name = xmalloc(nsize);
- xreadall(fd, name, nsize);
+ xreadall(fd, name = xmalloc(nsize), nsize);
if (!strcmp("TRAILER!!!", name)) return 0;
fsize = htou(hdr.c_filesize);
mode += htou(hdr.c_mode);
pad = 4 - ((nsize + 2) % 4); // 2 == sizeof(struct newc_header) % 4
if (pad < 4) xreadall(fd, toybuf, pad);
pad = 4 - (fsize % 4);
+
if (how & 1) {
- if (S_ISDIR(mode)) {
- ofd = mkdir(name, mode);
- } else if (S_ISLNK(mode)) {
+ if (S_ISDIR(mode)) ofd = mkdir(name, mode);
+ else if (S_ISLNK(mode)) {
memset(toybuf, 0, sizeof(toybuf));
if (fsize < sizeof(toybuf)) {
pad = readall(fd, toybuf, fsize);
@@ -194,9 +191,7 @@ int read_cpio_member(int fd, int how)
} else if (S_ISBLK(mode)||S_ISCHR(mode)||S_ISFIFO(mode)||S_ISSOCK(mode)) {
dev = makedev(htou(hdr.c_rdevmajor),htou(hdr.c_rdevminor));
ofd = mknod(name, mode, dev);
- } else {
- ofd = creat(name, mode);
- }
+ } else ofd = creat(name, mode);
if (ofd == -1) {
error_msg("could not create %s", name);
toys.exitval |= 1;
@@ -218,9 +213,7 @@ int read_cpio_member(int fd, int how)
void read_cpio_archive(int fd, int how)
{
- for(;;) {
- if (!read_cpio_member(fd, how)) return;
- }
+ for(;;) if (!read_cpio_member(fd, how)) return;
}
void cpio_main(void)
@@ -235,19 +228,11 @@ void cpio_main(void)
}
}
- switch (toys.optflags & (FLAG_i | FLAG_o | FLAG_t)) {
- case FLAG_o:
+ if (toys.optflags & FLAG_t) read_cpio_archive(0, 2);
+ else if (toys.optflags & FLAG_i) read_cpio_archive(0, 1);
+ else if (toys.optflags & FLAG_o) {
loopfiles_stdin(write_cpio_member);
write(1, "07070100000000000000000000000000000000000000010000000000000000"
"000000000000000000000000000000000000000B00000000TRAILER!!!\0\0\0", 124);
- break;
- case FLAG_i:
- read_cpio_archive(0, 1);
- case FLAG_t:
- case (FLAG_t | FLAG_i):
- read_cpio_archive(0, 2);
- break;
- default:
- error_exit("must use one of -iot");
- }
+ } else error_exit("must use one of -iot");
}