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| -rw-r--r-- | libbb/appletlib.c | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/libbb/appletlib.c b/libbb/appletlib.c new file mode 100644 index 0000000..626c25a --- /dev/null +++ b/libbb/appletlib.c @@ -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 <vda.linux@googlemail.com> + * + * 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(); +} |