1 files changed, 521 insertions, 0 deletions
diff --git a/libbb/xfuncs_printf.c b/libbb/xfuncs_printf.c
new file mode 100644
index 000000000..dd8687dc6
--- /dev/null
+++ b/libbb/xfuncs_printf.c
@@ -0,0 +1,521 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Utility routines.
+ *
+ * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
+ * Copyright (C) 2006 Rob Landley
+ * Copyright (C) 2006 Denys Vlasenko
+ *
+ * Licensed under GPL version 2, see file LICENSE in this tarball for details.
+ */
+
+/* We need to have separate xfuncs.c and xfuncs_printf.c because
+ * with current linkers, even with section garbage collection,
+ * if *.o module references any of XXXprintf functions, you pull in
+ * entire printf machinery. Even if you do not use the function
+ * which uses XXXprintf.
+ *
+ * xfuncs.c contains functions (not necessarily xfuncs)
+ * which do not pull in printf, directly or indirectly.
+ * xfunc_printf.c contains those which do.
+ */
+
+#include "libbb.h"
+
+
+/* All the functions starting with "x" call bb_error_msg_and_die() if they
+ * fail, so callers never need to check for errors.  If it returned, it
+ * succeeded. */
+
+#ifndef DMALLOC
+/* dmalloc provides variants of these that do abort() on failure.
+ * Since dmalloc's prototypes overwrite the impls here as they are
+ * included after these prototypes in libbb.h, all is well.
+ */
+// Warn if we can't allocate size bytes of memory.
+void *malloc_or_warn(size_t size)
+{
+	void *ptr = malloc(size);
+	if (ptr == NULL && size != 0)
+		bb_error_msg(bb_msg_memory_exhausted);
+	return ptr;
+}
+
+// Die if we can't allocate size bytes of memory.
+void *xmalloc(size_t size)
+{
+	void *ptr = malloc(size);
+	if (ptr == NULL && size != 0)
+		bb_error_msg_and_die(bb_msg_memory_exhausted);
+	return ptr;
+}
+
+// Die if we can't resize previously allocated memory.  (This returns a pointer
+// to the new memory, which may or may not be the same as the old memory.
+// It'll copy the contents to a new chunk and free the old one if necessary.)
+void *xrealloc(void *ptr, size_t size)
+{
+	ptr = realloc(ptr, size);
+	if (ptr == NULL && size != 0)
+		bb_error_msg_and_die(bb_msg_memory_exhausted);
+	return ptr;
+}
+#endif /* DMALLOC */
+
+// Die if we can't allocate and zero size bytes of memory.
+void *xzalloc(size_t size)
+{
+	void *ptr = xmalloc(size);
+	memset(ptr, 0, size);
+	return ptr;
+}
+
+// Die if we can't copy a string to freshly allocated memory.
+char * xstrdup(const char *s)
+{
+	char *t;
+
+	if (s == NULL)
+		return NULL;
+
+	t = strdup(s);
+
+	if (t == NULL)
+		bb_error_msg_and_die(bb_msg_memory_exhausted);
+
+	return t;
+}
+
+// Die if we can't allocate n+1 bytes (space for the null terminator) and copy
+// the (possibly truncated to length n) string into it.
+char *xstrndup(const char *s, int n)
+{
+	int m;
+	char *t;
+
+	if (ENABLE_DEBUG && s == NULL)
+		bb_error_msg_and_die("xstrndup bug");
+
+	/* We can just xmalloc(n+1) and strncpy into it, */
+	/* but think about xstrndup("abc", 10000) wastage! */
+	m = n;
+	t = (char*) s;
+	while (m) {
+		if (!*t) break;
+		m--;
+		t++;
+	}
+	n -= m;
+	t = xmalloc(n + 1);
+	t[n] = '\0';
+
+	return memcpy(t, s, n);
+}
+
+// Die if we can't open a file and return a FILE * to it.
+// Notice we haven't got xfread(), This is for use with fscanf() and friends.
+FILE *xfopen(const char *path, const char *mode)
+{
+	FILE *fp = fopen(path, mode);
+	if (fp == NULL)
+		bb_perror_msg_and_die("can't open '%s'", path);
+	return fp;
+}
+
+// Die if we can't open a file and return a fd.
+int xopen3(const char *pathname, int flags, int mode)
+{
+	int ret;
+
+	ret = open(pathname, flags, mode);
+	if (ret < 0) {
+		bb_perror_msg_and_die("can't open '%s'", pathname);
+	}
+	return ret;
+}
+
+// Die if we can't open an existing file and return a fd.
+int xopen(const char *pathname, int flags)
+{
+	return xopen3(pathname, flags, 0666);
+}
+
+// Warn if we can't open a file and return a fd.
+int open3_or_warn(const char *pathname, int flags, int mode)
+{
+	int ret;
+
+	ret = open(pathname, flags, mode);
+	if (ret < 0) {
+		bb_perror_msg("can't open '%s'", pathname);
+	}
+	return ret;
+}
+
+// Warn if we can't open a file and return a fd.
+int open_or_warn(const char *pathname, int flags)
+{
+	return open3_or_warn(pathname, flags, 0666);
+}
+
+void xunlink(const char *pathname)
+{
+	if (unlink(pathname))
+		bb_perror_msg_and_die("can't remove file '%s'", pathname);
+}
+
+void xrename(const char *oldpath, const char *newpath)
+{
+	if (rename(oldpath, newpath))
+		bb_perror_msg_and_die("can't move '%s' to '%s'", oldpath, newpath);
+}
+
+int rename_or_warn(const char *oldpath, const char *newpath)
+{
+	int n = rename(oldpath, newpath);
+	if (n)
+		bb_perror_msg("can't move '%s' to '%s'", oldpath, newpath);
+	return n;
+}
+
+void xpipe(int filedes[2])
+{
+	if (pipe(filedes))
+		bb_perror_msg_and_die("can't create pipe");
+}
+
+void xdup2(int from, int to)
+{
+	if (dup2(from, to) != to)
+		bb_perror_msg_and_die("can't duplicate file descriptor");
+}
+
+// "Renumber" opened fd
+void xmove_fd(int from, int to)
+{
+	if (from == to)
+		return;
+	xdup2(from, to);
+	close(from);
+}
+
+// Die with an error message if we can't write the entire buffer.
+void xwrite(int fd, const void *buf, size_t count)
+{
+	if (count) {
+		ssize_t size = full_write(fd, buf, count);
+		if (size != count)
+			bb_error_msg_and_die("short write");
+	}
+}
+
+// Die with an error message if we can't lseek to the right spot.
+off_t xlseek(int fd, off_t offset, int whence)
+{
+	off_t off = lseek(fd, offset, whence);
+	if (off == (off_t)-1) {
+		if (whence == SEEK_SET)
+			bb_perror_msg_and_die("lseek(%"OFF_FMT"u)", offset);
+		bb_perror_msg_and_die("lseek");
+	}
+	return off;
+}
+
+// Die with supplied filename if this FILE * has ferror set.
+void die_if_ferror(FILE *fp, const char *fn)
+{
+	if (ferror(fp)) {
+		/* ferror doesn't set useful errno */
+		bb_error_msg_and_die("%s: I/O error", fn);
+	}
+}
+
+// Die with an error message if stdout has ferror set.
+void die_if_ferror_stdout(void)
+{
+	die_if_ferror(stdout, bb_msg_standard_output);
+}
+
+// Die with an error message if we have trouble flushing stdout.
+void xfflush_stdout(void)
+{
+	if (fflush(stdout)) {
+		bb_perror_msg_and_die(bb_msg_standard_output);
+	}
+}
+
+
+int bb_putchar(int ch)
+{
+	/* time.c needs putc(ch, stdout), not putchar(ch).
+	 * it does "stdout = stderr;", but then glibc's putchar()
+	 * doesn't work as expected. bad glibc, bad */
+	return putc(ch, stdout);
+}
+
+/* Die with an error message if we can't copy an entire FILE * to stdout,
+ * then close that file. */
+void xprint_and_close_file(FILE *file)
+{
+	fflush(stdout);
+	// copyfd outputs error messages for us.
+	if (bb_copyfd_eof(fileno(file), 1) == -1)
+		xfunc_die();
+
+	fclose(file);
+}
+
+// Die with an error message if we can't malloc() enough space and do an
+// sprintf() into that space.
+char *xasprintf(const char *format, ...)
+{
+	va_list p;
+	int r;
+	char *string_ptr;
+
+#if 1
+	// GNU extension
+	va_start(p, format);
+	r = vasprintf(&string_ptr, format, p);
+	va_end(p);
+#else
+	// Bloat for systems that haven't got the GNU extension.
+	va_start(p, format);
+	r = vsnprintf(NULL, 0, format, p);
+	va_end(p);
+	string_ptr = xmalloc(r+1);
+	va_start(p, format);
+	r = vsnprintf(string_ptr, r+1, format, p);
+	va_end(p);
+#endif
+
+	if (r < 0)
+		bb_error_msg_and_die(bb_msg_memory_exhausted);
+	return string_ptr;
+}
+
+#if 0 /* If we will ever meet a libc which hasn't [f]dprintf... */
+int fdprintf(int fd, const char *format, ...)
+{
+	va_list p;
+	int r;
+	char *string_ptr;
+
+#if 1
+	// GNU extension
+	va_start(p, format);
+	r = vasprintf(&string_ptr, format, p);
+	va_end(p);
+#else
+	// Bloat for systems that haven't got the GNU extension.
+	va_start(p, format);
+	r = vsnprintf(NULL, 0, format, p) + 1;
+	va_end(p);
+	string_ptr = malloc(r);
+	if (string_ptr) {
+		va_start(p, format);
+		r = vsnprintf(string_ptr, r, format, p);
+		va_end(p);
+	}
+#endif
+
+	if (r >= 0) {
+		full_write(fd, string_ptr, r);
+		free(string_ptr);
+	}
+	return r;
+}
+#endif
+
+void xsetenv(const char *key, const char *value)
+{
+	if (setenv(key, value, 1))
+		bb_error_msg_and_die(bb_msg_memory_exhausted);
+}
+
+// Die with an error message if we can't set gid.  (Because resource limits may
+// limit this user to a given number of processes, and if that fills up the
+// setgid() will fail and we'll _still_be_root_, which is bad.)
+void xsetgid(gid_t gid)
+{
+	if (setgid(gid)) bb_perror_msg_and_die("setgid");
+}
+
+// Die with an error message if we can't set uid.  (See xsetgid() for why.)
+void xsetuid(uid_t uid)
+{
+	if (setuid(uid)) bb_perror_msg_and_die("setuid");
+}
+
+// Die if we can't chdir to a new path.
+void xchdir(const char *path)
+{
+	if (chdir(path))
+		bb_perror_msg_and_die("chdir(%s)", path);
+}
+
+void xchroot(const char *path)
+{
+	if (chroot(path))
+		bb_perror_msg_and_die("can't change root directory to %s", path);
+}
+
+// Print a warning message if opendir() fails, but don't die.
+DIR *warn_opendir(const char *path)
+{
+	DIR *dp;
+
+	dp = opendir(path);
+	if (!dp)
+		bb_perror_msg("can't open '%s'", path);
+	return dp;
+}
+
+// Die with an error message if opendir() fails.
+DIR *xopendir(const char *path)
+{
+	DIR *dp;
+
+	dp = opendir(path);
+	if (!dp)
+		bb_perror_msg_and_die("can't open '%s'", path);
+	return dp;
+}
+
+// Die with an error message if we can't open a new socket.
+int xsocket(int domain, int type, int protocol)
+{
+	int r = socket(domain, type, protocol);
+
+	if (r < 0) {
+		/* Hijack vaguely related config option */
+#if ENABLE_VERBOSE_RESOLUTION_ERRORS
+		const char *s = "INET";
+		if (domain == AF_PACKET) s = "PACKET";
+		if (domain == AF_NETLINK) s = "NETLINK";
+USE_FEATURE_IPV6(if (domain == AF_INET6) s = "INET6";)
+		bb_perror_msg_and_die("socket(AF_%s)", s);
+#else
+		bb_perror_msg_and_die("socket");
+#endif
+	}
+
+	return r;
+}
+
+// Die with an error message if we can't bind a socket to an address.
+void xbind(int sockfd, struct sockaddr *my_addr, socklen_t addrlen)
+{
+	if (bind(sockfd, my_addr, addrlen)) bb_perror_msg_and_die("bind");
+}
+
+// Die with an error message if we can't listen for connections on a socket.
+void xlisten(int s, int backlog)
+{
+	if (listen(s, backlog)) bb_perror_msg_and_die("listen");
+}
+
+/* Die with an error message if sendto failed.
+ * Return bytes sent otherwise  */
+ssize_t xsendto(int s, const  void *buf, size_t len, const struct sockaddr *to,
+				socklen_t tolen)
+{
+	ssize_t ret = sendto(s, buf, len, 0, to, tolen);
+	if (ret < 0) {
+		if (ENABLE_FEATURE_CLEAN_UP)
+			close(s);
+		bb_perror_msg_and_die("sendto");
+	}
+	return ret;
+}
+
+// xstat() - a stat() which dies on failure with meaningful error message
+void xstat(const char *name, struct stat *stat_buf)
+{
+	if (stat(name, stat_buf))
+		bb_perror_msg_and_die("can't stat '%s'", name);
+}
+
+// selinux_or_die() - die if SELinux is disabled.
+void selinux_or_die(void)
+{
+#if ENABLE_SELINUX
+	int rc = is_selinux_enabled();
+	if (rc == 0) {
+		bb_error_msg_and_die("SELinux is disabled");
+	} else if (rc < 0) {
+		bb_error_msg_and_die("is_selinux_enabled() failed");
+	}
+#else
+	bb_error_msg_and_die("SELinux support is disabled");
+#endif
+}
+
+int ioctl_or_perror_and_die(int fd, int request, void *argp, const char *fmt,...)
+{
+	int ret;
+	va_list p;
+
+	ret = ioctl(fd, request, argp);
+	if (ret < 0) {
+		va_start(p, fmt);
+		bb_verror_msg(fmt, p, strerror(errno));
+		/* xfunc_die can actually longjmp, so be nice */
+		va_end(p);
+		xfunc_die();
+	}
+	return ret;
+}
+
+int ioctl_or_perror(int fd, int request, void *argp, const char *fmt,...)
+{
+	va_list p;
+	int ret = ioctl(fd, request, argp);
+
+	if (ret < 0) {
+		va_start(p, fmt);
+		bb_verror_msg(fmt, p, strerror(errno));
+		va_end(p);
+	}
+	return ret;
+}
+
+#if ENABLE_IOCTL_HEX2STR_ERROR
+int bb_ioctl_or_warn(int fd, int request, void *argp, const char *ioctl_name)
+{
+	int ret;
+
+	ret = ioctl(fd, request, argp);
+	if (ret < 0)
+		bb_simple_perror_msg(ioctl_name);
+	return ret;
+}
+int bb_xioctl(int fd, int request, void *argp, const char *ioctl_name)
+{
+	int ret;
+
+	ret = ioctl(fd, request, argp);
+	if (ret < 0)
+		bb_simple_perror_msg_and_die(ioctl_name);
+	return ret;
+}
+#else
+int bb_ioctl_or_warn(int fd, int request, void *argp)
+{
+	int ret;
+
+	ret = ioctl(fd, request, argp);
+	if (ret < 0)
+		bb_perror_msg("ioctl %#x failed", request);
+	return ret;
+}
+int bb_xioctl(int fd, int request, void *argp)
+{
+	int ret;
+
+	ret = ioctl(fd, request, argp);
+	if (ret < 0)
+		bb_perror_msg_and_die("ioctl %#x failed", request);
+	return ret;
+}
+#endif