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ac7d0e375

Denis Vlasenko

2007-10-08

FAILED Duration: 13s

Subject

add libbb/appletlib.c

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Architecture & Compiler Flags

Architecture: x86_64-linux-gnu Compiler: gcc (Ubuntu 11.4.0-1ubuntu1~22.04.3) 11.4.0

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Commit Diff GitHub →

libbb/appletlib.c +139 -0

libbb/appletlib.c+139 -0

@@ -0,0 +1,139 @@
+	/* vi: set sw=4 ts=4: */
+	/*
+	* Support for main() which needs to end up in libbusybox, not busybox,
+	* if one builds libbusybox.
+	*
+	* Copyright (C) 2007 Denys Vlasenko <[email protected]>
+	*
+	* Licensed under GPLv2, see file License in this tarball for details.
+	*/
+
+	#include <assert.h>
+	#include "busybox.h"
+
+
+	/* Declare <applet>_main() */
+	#define PROTOTYPES
+	#include "applets.h"
+	#undef PROTOTYPES
+
+	#if ENABLE_SHOW_USAGE && !ENABLE_FEATURE_COMPRESS_USAGE
+	/* Define usage_messages[] */
+	static const char usage_messages[] ALIGN1 = ""
+	#define MAKE_USAGE
+	#include "usage.h"
+	#include "applets.h"
+	;
+	#undef MAKE_USAGE
+	#else
+	#define usage_messages 0
+	#endif /* SHOW_USAGE */
+
+	/* Define struct bb_applet applets[] */
+	#include "applets.h"
+
+	#if ENABLE_FEATURE_SH_STANDALONE
+	/* -1 because last entry is NULL */
+	const unsigned short NUM_APPLETS = ARRAY_SIZE(applets) - 1;
+	#endif
+
+
+	#if ENABLE_FEATURE_COMPRESS_USAGE
+
+	#include "usage_compressed.h"
+	#include "unarchive.h"
+
+	static const char *unpack_usage_messages(void)
+	{
+	char *outbuf = NULL;
+	bunzip_data *bd;
+	int i;
+
+	i = start_bunzip(&bd,
+	/* src_fd: */ -1,
+	/* inbuf: */ packed_usage,
+	/* len: */ sizeof(packed_usage));
+	/* read_bunzip can longjmp to start_bunzip, and ultimately
+	* end up here with i != 0 on read data errors! Not trivial */
+	if (!i) {
+	/* Cannot use xmalloc: will leak bd in NOFORK case! */
+	outbuf = malloc_or_warn(SIZEOF_usage_messages);
+	if (outbuf)
+	read_bunzip(bd, outbuf, SIZEOF_usage_messages);
+	}
+	dealloc_bunzip(bd);
+	return outbuf;
+	}
+	#define dealloc_usage_messages(s) free(s)
+
+	#else
+
+	#define unpack_usage_messages() usage_messages
+	#define dealloc_usage_messages(s) ((void)(s))
+
+	#endif /* FEATURE_COMPRESS_USAGE */
+
+
+	void bb_show_usage(void)
+	{
+	if (ENABLE_SHOW_USAGE) {
+	const char *format_string;
+	const char *p;
+	const char *usage_string = p = unpack_usage_messages();
+	const struct bb_applet *ap = find_applet_by_name(applet_name);
+	int i;
+
+	if (!ap) /* never happens, paranoia */
+	xfunc_die();
+
+	i = ap - applets;
+	while (i) {
+	while (*p++) continue;
+	i--;
+	}
+
+	fprintf(stderr, "%s multi-call binary\n", bb_banner);
+	format_string = "\nUsage: %s %s\n\n";
+	if (*p == '\b')
+	format_string = "\nNo help available.\n\n";
+	fprintf(stderr, format_string, applet_name, p);
+	dealloc_usage_messages((char*)usage_string);
+	}
+	xfunc_die();
+	}
+
+
+	static int applet_name_compare(const void name, const void vapplet)
+	{
+	const struct bb_applet *applet = vapplet;
+
+	return strcmp(name, applet->name);
+	}
+
+	const struct bb_applet find_applet_by_name(const char name)
+	{
+	/* Do a binary search to find the applet entry given the name. */
+	return bsearch(name, applets, ARRAY_SIZE(applets)-1, sizeof(applets[0]),
+	applet_name_compare);
+	}
+
+
+	#ifdef __GLIBC__
+	/* Make it reside in R/W memory: */
+	int *const bb_errno __attribute__ ((section (".data")));
+	#endif
+
+	void bbox_prepare_main(char **argv)
+	{
+	#ifdef __GLIBC__
+	((int *)&bb_errno) = __errno_location();
+	#endif
+
+	/* Set locale for everybody except 'init' */
+	if (ENABLE_LOCALE_SUPPORT && getpid() != 1)
+	setlocale(LC_ALL, "");
+
+	/* Redundant for busybox, but needed for individual applets */
+	if (argv[1] && strcmp(argv[1], "--help") == 0)
+	bb_show_usage();
+	}