X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;ds=sidebyside;f=libbb%2Fread.c;h=5906bc225dc62dde00025cf77ffde09061acf2a2;hb=86ffe5c15a14dc7f8483faf42ef907c5f861137d;hp=f3af144f0636533e5be82ea9296f7994abfaa2d2;hpb=bfa1b2e8e8aaddcf849011a12cb2ac634b27f339;p=oweals%2Fbusybox.git

diff --git a/libbb/read.c b/libbb/read.c
index f3af144f0..5906bc225 100644
--- a/libbb/read.c
+++ b/libbb/read.c
@@ -4,20 +4,10 @@
  *
  * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
  *
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  */
 #include "libbb.h"
 
-#define ZIPPED (ENABLE_FEATURE_SEAMLESS_LZMA \
-	|| ENABLE_FEATURE_SEAMLESS_BZ2 \
-	|| ENABLE_FEATURE_SEAMLESS_GZ \
-	/* || ENABLE_FEATURE_SEAMLESS_Z */ \
-)
-
-#if ZIPPED
-# include "unarchive.h"
-#endif
-
 ssize_t FAST_FUNC safe_read(int fd, void *buf, size_t count)
 {
 	ssize_t n;
@@ -29,58 +19,6 @@ ssize_t FAST_FUNC safe_read(int fd, void *buf, size_t count)
 	return n;
 }
 
-/* Suppose that you are a shell. You start child processes.
- * They work and eventually exit. You want to get user input.
- * You read stdin. But what happens if last child switched
- * its stdin into O_NONBLOCK mode?
- *
- * *** SURPRISE! It will affect the parent too! ***
- * *** BIG SURPRISE! It stays even after child exits! ***
- *
- * This is a design bug in UNIX API.
- *      fcntl(0, F_SETFL, fcntl(0, F_GETFL) | O_NONBLOCK);
- * will set nonblocking mode not only on _your_ stdin, but
- * also on stdin of your parent, etc.
- *
- * In general,
- *      fd2 = dup(fd1);
- *      fcntl(fd2, F_SETFL, fcntl(fd2, F_GETFL) | O_NONBLOCK);
- * sets both fd1 and fd2 to O_NONBLOCK. This includes cases
- * where duping is done implicitly by fork() etc.
- *
- * We need
- *      fcntl(fd2, F_SETFD, fcntl(fd2, F_GETFD) | O_NONBLOCK);
- * (note SETFD, not SETFL!) but such thing doesn't exist.
- *
- * Alternatively, we need nonblocking_read(fd, ...) which doesn't
- * require O_NONBLOCK dance at all. Actually, it exists:
- *      n = recv(fd, buf, len, MSG_DONTWAIT);
- *      "MSG_DONTWAIT:
- *      Enables non-blocking operation; if the operation
- *      would block, EAGAIN is returned."
- * but recv() works only for sockets!
- *
- * So far I don't see any good solution, I can only propose
- * that affected readers should be careful and use this routine,
- * which detects EAGAIN and uses poll() to wait on the fd.
- * Thankfully, poll() doesn't care about O_NONBLOCK flag.
- */
-ssize_t FAST_FUNC nonblock_safe_read(int fd, void *buf, size_t count)
-{
-	struct pollfd pfd[1];
-	ssize_t n;
-
-	while (1) {
-		n = safe_read(fd, buf, count);
-		if (n >= 0 || errno != EAGAIN)
-			return n;
-		/* fd is in O_NONBLOCK mode. Wait using poll and repeat */
-		pfd[0].fd = fd;
-		pfd[0].events = POLLIN;
-		safe_poll(pfd, 1, -1);
-	}
-}
-
 /*
  * Read all of the supplied buffer from a file.
  * This does multiple reads as necessary.
@@ -115,60 +53,6 @@ ssize_t FAST_FUNC full_read(int fd, void *buf, size_t len)
 	return total;
 }
 
-/* Die with an error message if we can't read the entire buffer. */
-void FAST_FUNC xread(int fd, void *buf, size_t count)
-{
-	if (count) {
-		ssize_t size = full_read(fd, buf, count);
-		if ((size_t)size != count)
-			bb_error_msg_and_die("short read");
-	}
-}
-
-/* Die with an error message if we can't read one character. */
-unsigned char FAST_FUNC xread_char(int fd)
-{
-	char tmp;
-	xread(fd, &tmp, 1);
-	return tmp;
-}
-
-// Reads one line a-la fgets (but doesn't save terminating '\n').
-// Reads byte-by-byte. Useful when it is important to not read ahead.
-// Bytes are appended to pfx (which must be malloced, or NULL).
-char* FAST_FUNC xmalloc_reads(int fd, char *buf, size_t *maxsz_p)
-{
-	char *p;
-	size_t sz = buf ? strlen(buf) : 0;
-	size_t maxsz = maxsz_p ? *maxsz_p : (INT_MAX - 4095);
-
-	goto jump_in;
-	while (sz < maxsz) {
-		if ((size_t)(p - buf) == sz) {
- jump_in:
-			buf = xrealloc(buf, sz + 128);
-			p = buf + sz;
-			sz += 128;
-		}
-		/* nonblock_safe_read() because we are used by e.g. shells */
-		if (nonblock_safe_read(fd, p, 1) != 1) { /* EOF/error */
-			if (p == buf) { /* we read nothing */
-				free(buf);
-				return NULL;
-			}
-			break;
-		}
-		if (*p == '\n')
-			break;
-		p++;
-	}
-	*p = '\0';
-	if (maxsz_p)
-		*maxsz_p  = p - buf;
-	p++;
-	return xrealloc(buf, p - buf);
-}
-
 ssize_t FAST_FUNC read_close(int fd, void *buf, size_t size)
 {
 	/*int e;*/
@@ -186,228 +70,3 @@ ssize_t FAST_FUNC open_read_close(const char *filename, void *buf, size_t size)
 		return fd;
 	return read_close(fd, buf, size);
 }
-
-
-// Read (potentially big) files in one go. File size is estimated
-// by stat. Extra '\0' byte is appended.
-void* FAST_FUNC xmalloc_read(int fd, size_t *maxsz_p)
-{
-	char *buf;
-	size_t size, rd_size, total;
-	size_t to_read;
-	struct stat st;
-
-	to_read = maxsz_p ? *maxsz_p : (INT_MAX - 4095); /* max to read */
-
-	/* Estimate file size */
-	st.st_size = 0; /* in case fstat fails, assume 0 */
-	fstat(fd, &st);
-	/* /proc/N/stat files report st_size 0 */
-	/* In order to make such files readable, we add small const */
-	size = (st.st_size | 0x3ff) + 1;
-
-	total = 0;
-	buf = NULL;
-	while (1) {
-		if (to_read < size)
-			size = to_read;
-		buf = xrealloc(buf, total + size + 1);
-		rd_size = full_read(fd, buf + total, size);
-		if ((ssize_t)rd_size == (ssize_t)(-1)) { /* error */
-			free(buf);
-			return NULL;
-		}
-		total += rd_size;
-		if (rd_size < size) /* EOF */
-			break;
-		if (to_read <= rd_size)
-			break;
-		to_read -= rd_size;
-		/* grow by 1/8, but in [1k..64k] bounds */
-		size = ((total / 8) | 0x3ff) + 1;
-		if (size > 64*1024)
-			size = 64*1024;
-	}
-	buf = xrealloc(buf, total + 1);
-	buf[total] = '\0';
-
-	if (maxsz_p)
-		*maxsz_p = total;
-	return buf;
-}
-
-#ifdef USING_LSEEK_TO_GET_SIZE
-/* Alternatively, file size can be obtained by lseek to the end.
- * The code is slightly bigger. Retained in case fstat approach
- * will not work for some weird cases (/proc, block devices, etc).
- * (NB: lseek also can fail to work for some weird files) */
-
-// Read (potentially big) files in one go. File size is estimated by
-// lseek to end.
-void* FAST_FUNC xmalloc_open_read_close(const char *filename, size_t *maxsz_p)
-{
-	char *buf;
-	size_t size;
-	int fd;
-	off_t len;
-
-	fd = open(filename, O_RDONLY);
-	if (fd < 0)
-		return NULL;
-
-	/* /proc/N/stat files report len 0 here */
-	/* In order to make such files readable, we add small const */
-	size = 0x3ff; /* read only 1k on unseekable files */
-	len = lseek(fd, 0, SEEK_END) | 0x3ff; /* + up to 1k */
-	if (len != (off_t)-1) {
-		xlseek(fd, 0, SEEK_SET);
-		size = maxsz_p ? *maxsz_p : (INT_MAX - 4095);
-		if (len < size)
-			size = len;
-	}
-
-	buf = xmalloc(size + 1);
-	size = read_close(fd, buf, size);
-	if ((ssize_t)size < 0) {
-		free(buf);
-		return NULL;
-	}
-	buf = xrealloc(buf, size + 1);
-	buf[size] = '\0';
-
-	if (maxsz_p)
-		*maxsz_p = size;
-	return buf;
-}
-#endif
-
-// Read (potentially big) files in one go. File size is estimated
-// by stat.
-void* FAST_FUNC xmalloc_open_read_close(const char *filename, size_t *maxsz_p)
-{
-	char *buf;
-	int fd;
-
-	fd = open(filename, O_RDONLY);
-	if (fd < 0)
-		return NULL;
-
-	buf = xmalloc_read(fd, maxsz_p);
-	close(fd);
-	return buf;
-}
-
-void* FAST_FUNC xmalloc_xopen_read_close(const char *filename, size_t *maxsz_p)
-{
-	void *buf = xmalloc_open_read_close(filename, maxsz_p);
-	if (!buf)
-		bb_perror_msg_and_die("can't read '%s'", filename);
-	return buf;
-}
-
-#if ZIPPED
-int FAST_FUNC setup_unzip_on_fd(int fd /*, int fail_if_not_detected*/)
-{
-	const int fail_if_not_detected = 1;
-	unsigned char magic[2];
-#if BB_MMU
-	IF_DESKTOP(long long) int FAST_FUNC (*xformer)(int src_fd, int dst_fd);
-	enum { xformer_prog = 0 };
-#else
-	enum { xformer = 0 };
-	const char *xformer_prog;
-#endif
-
-	/* .gz and .bz2 both have 2-byte signature, and their
-	 * unpack_XXX_stream wants this header skipped. */
-	xread(fd, &magic, 2);
-	if (ENABLE_FEATURE_SEAMLESS_GZ
-	 && magic[0] == 0x1f && magic[1] == 0x8b
-	) {
-# if BB_MMU
-		xformer = unpack_gz_stream;
-# else
-		xformer_prog = "gunzip";
-# endif
-		goto found_magic;
-	}
-	if (ENABLE_FEATURE_SEAMLESS_BZ2
-	 && magic[0] == 'B' && magic[1] == 'Z'
-	) {
-# if BB_MMU
-		xformer = unpack_bz2_stream;
-# else
-		xformer_prog = "bunzip2";
-# endif
-		goto found_magic;
-	}
-// TODO: xz format support. rpm adopted it, "rpm -i FILE.rpm" badly needs this.
-// Signature: 0xFD, '7', 'z', 'X', 'Z', 0x00
-// More info at: http://tukaani.org/xz/xz-file-format.txt
-
-	/* No known magic seen */
-	if (fail_if_not_detected)
-		bb_error_msg_and_die("no gzip"
-			IF_FEATURE_SEAMLESS_BZ2("/bzip2")
-			" magic");
-	xlseek(fd, -2, SEEK_CUR);
-	return fd;
-
- found_magic:
-# if !BB_MMU
-	/* NOMMU version of open_transformer execs
-	 * an external unzipper that wants
-	 * file position at the start of the file */
-	xlseek(fd, -2, SEEK_CUR);
-# endif
-	open_transformer(fd, xformer, xformer_prog);
-
-	return fd;
-}
-#endif /* ZIPPED */
-
-int FAST_FUNC open_zipped(const char *fname)
-{
-#if !ZIPPED
-	return open(fname, O_RDONLY);
-#else
-	char *sfx;
-	int fd;
-
-	fd = open(fname, O_RDONLY);
-	if (fd < 0)
-		return fd;
-
-	sfx = strrchr(fname, '.');
-	if (sfx) {
-		if (ENABLE_FEATURE_SEAMLESS_LZMA && strcmp(sfx, ".lzma") == 0)
-			/* .lzma has no header/signature, just trust it */
-			open_transformer(fd, unpack_lzma_stream, "unlzma");
-		else
-		if ((ENABLE_FEATURE_SEAMLESS_GZ && strcmp(sfx, ".gz") == 0)
-		 || (ENABLE_FEATURE_SEAMLESS_BZ2 && strcmp(sfx, ".bz2") == 0)
-		) {
-			setup_unzip_on_fd(fd /*, fail_if_not_detected: 1*/);
-		}
-	}
-
-	return fd;
-#endif
-}
-
-void* FAST_FUNC xmalloc_open_zipped_read_close(const char *fname, size_t *maxsz_p)
-{
-	int fd;
-	char *image;
-
-	fd = open_zipped(fname);
-	if (fd < 0)
-		return NULL;
-
-	image = xmalloc_read(fd, maxsz_p);
-	if (!image)
-		bb_perror_msg("read error from '%s'", fname);
-	close(fd);
-
-	return image;
-}