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open_transformer: do not duplicate "<program> -cf -"

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text    data     bss     dec     hex filename
 677858     738    7236  685832   a7708 busybox_old
 677804     738    7236  685778   a76d2 busybox_unstripped
This commit is contained in:
Denis Vlasenko 2007-11-12 02:13:12 +00:00
parent 4bfb84db4e
commit 059c91711f
7 changed files with 22 additions and 20 deletions
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2
archival/libunarchive/get_header_tar_bz2.c
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@ -11,7 +11,7 @@ char get_header_tar_bz2(archive_handle_t *archive_handle)
/* Can't lseek over pipes */
archive_handle->seek = seek_by_read;
archive_handle->src_fd = open_transformer(archive_handle->src_fd, unpack_bz2_stream, "bunzip2", "bunzip2", "-cf", "-", NULL);
archive_handle->src_fd = open_transformer(archive_handle->src_fd, unpack_bz2_stream, "bunzip2");
archive_handle->offset = 0;
while (get_header_tar(archive_handle) == EXIT_SUCCESS)
continue;

2
archival/libunarchive/get_header_tar_gz.c
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@ -25,7 +25,7 @@ char get_header_tar_gz(archive_handle_t *archive_handle)
}
#endif
archive_handle->src_fd = open_transformer(archive_handle->src_fd, unpack_gz_stream, "gunzip", "gunzip", "-cf", "-", NULL);
archive_handle->src_fd = open_transformer(archive_handle->src_fd, unpack_gz_stream, "gunzip");
archive_handle->offset = 0;
while (get_header_tar(archive_handle) == EXIT_SUCCESS)
continue;

2
archival/libunarchive/get_header_tar_lzma.c
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@ -14,7 +14,7 @@ char get_header_tar_lzma(archive_handle_t * archive_handle)
/* Can't lseek over pipes */
archive_handle->seek = seek_by_read;
archive_handle->src_fd = open_transformer(archive_handle->src_fd, unpack_lzma_stream, "unlzma", "unlzma", "-cf", "-", NULL);
archive_handle->src_fd = open_transformer(archive_handle->src_fd, unpack_lzma_stream, "unlzma");
archive_handle->offset = 0;
while (get_header_tar(archive_handle) == EXIT_SUCCESS)
continue;

26
archival/libunarchive/open_transformer.c
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@ -8,12 +8,12 @@
/* transformer(), more than meets the eye */
/*
* On MMU machine, the transform_prog and ... are stripped
* by a macro in include/unarchive.h. On NOMMU, transformer is stripped.
* On MMU machine, the transform_prog is removed by macro magic
* in include/unarchive.h. On NOMMU, transformer is removed.
*/
int open_transformer(int src_fd,
USE_DESKTOP(long long) int (*transformer)(int src_fd, int dst_fd),
const char *transform_prog, ...)
const char *transform_prog)
{
int fd_pipe[2];
int pid;
@ -29,9 +29,6 @@ int open_transformer(int src_fd,
bb_perror_msg_and_die("fork failed");
if (pid == 0) {
#if !BB_MMU
va_list ap;
#endif
/* child process */
close(fd_pipe[0]); /* We don't wan't to read from the parent */
// FIXME: error check?
@ -43,12 +40,17 @@ int open_transformer(int src_fd,
}
exit(0);
#else
xmove_fd(src_fd, 0);
xmove_fd(fd_pipe[1], 1);
va_start(ap, transform_prog);
/* hoping that va_list -> char** on our CPU is working... */
BB_EXECVP(transform_prog, (void*)ap);
bb_perror_msg_and_die("exec failed");
{
char *argv[4];
xmove_fd(src_fd, 0);
xmove_fd(fd_pipe[1], 1);
argv[0] = (char*)transform_prog;
argv[1] = (char*)"-cf";
argv[2] = (char*)"-";
argv[3] = NULL;
BB_EXECVP(transform_prog, argv);
bb_perror_msg_and_die("exec failed");
}
#endif
/* notreached */
}

2
archival/rpm.c
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@ -237,7 +237,7 @@ static void extract_cpio_gz(int fd)
}
xchdir("/"); /* Install RPM's to root */
archive_handle->src_fd = open_transformer(archive_handle->src_fd, xformer, xformer_prog, xformer_prog, "-cf", "-", NULL);
archive_handle->src_fd = open_transformer(archive_handle->src_fd, xformer, xformer_prog);
archive_handle->offset = 0;
while (get_header_cpio(archive_handle) == EXIT_SUCCESS)
continue;

2
archival/tar.c
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@ -662,7 +662,7 @@ static char get_header_tar_Z(archive_handle_t *archive_handle)
bb_error_msg_and_die("invalid magic");
}
archive_handle->src_fd = open_transformer(archive_handle->src_fd, uncompress, "uncompress", "uncompress", "-cf", "-", NULL);
archive_handle->src_fd = open_transformer(archive_handle->src_fd, uncompress, "uncompress");
archive_handle->offset = 0;
while (get_header_tar(archive_handle) == EXIT_SUCCESS)
continue;

6
include/unarchive.h
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@ -116,10 +116,10 @@ extern USE_DESKTOP(long long) int unpack_lzma_stream(int src_fd, int dst_fd);
#if BB_MMU
extern int open_transformer(int src_fd,
USE_DESKTOP(long long) int (*transformer)(int src_fd, int dst_fd));
#define open_transformer(src_fd, transformer, transform_prog, ...) open_transformer(src_fd, transformer)
#define open_transformer(src_fd, transformer, transform_prog) open_transformer(src_fd, transformer)
#else
extern int open_transformer(int src_fd, const char *transform_prog, ...);
#define open_transformer(src_fd, transformer, transform_prog, ...) open_transformer(src_fd, transform_prog, __VA_ARGS__)
extern int open_transformer(int src_fd, const char *transform_prog);
#define open_transformer(src_fd, transformer, transform_prog) open_transformer(src_fd, transform_prog)
#endif
#endif