/* * Copyright (C) 2015-2020 Giacomo Tesio * * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ #pragma lib "libjehanne.a" #pragma src "/sys/src/lib/jehanne" #define JEHANNE_LIBC /* only for native code */ #define nelem(x) (sizeof(x)/sizeof((x)[0])) #define offsetof(s, m) (uintptr_t)(&(((s*)0)->m)) #define assert(x) if(x){}else jehanne__assert(#x) extern void (*_abort)(void); #define abort() if(_abort){_abort();}else{while(*(int*)0);} /* * mem routines */ extern void* jehanne_memccpy(void*, const void*, int, uint32_t); extern void* jehanne_memset(void*, int, uint32_t); extern int jehanne_memcmp(const void*, const void*, uint32_t); extern void* jehanne_memcpy(void*, const void*, size_t); extern void* jehanne_memmove(void*, const void*, size_t); extern void* jehanne_memchr(const void*, int, uint32_t); /* * string routines */ extern char* jehanne_strcat(char*, const char*); extern char* jehanne_strchr(const char*, int); extern int jehanne_strcmp(const char*, const char*); extern char* jehanne_strcpy(char*, const char*); extern char* jehanne_strecpy(char*, char *, const char*); extern char* jehanne_strdup(const char*); extern char* jehanne_strncat(char*, const char*, int32_t); extern char* jehanne_strncpy(char*, const char*, uint32_t); extern int jehanne_strncmp(const char*, const char*, int32_t); extern char* jehanne_strpbrk(const char*, const char*); extern char* jehanne_strrchr(const char*, int); extern char* jehanne_strtok(char*, char*); extern int jehanne_strlen(const char*); extern int32_t jehanne_strspn(const char*, const char*); extern int32_t jehanne_strcspn(const char*, const char*); extern char* jehanne_strstr(const char*, const char*); extern int jehanne_cistrncmp(const char*, const char*, int); extern int jehanne_cistrcmp(const char*, const char*); extern char* jehanne_cistrstr(const char*, const char*); extern int jehanne_tokenize(char*, char**, int); enum { UTFmax = 4, /* maximum bytes per rune */ Runesync = 0x80, /* cannot represent part of a UTF sequence (<) */ Runeself = 0x80, /* rune and UTF sequences are the same (<) */ Runeerror = 0xFFFD, /* decoding error in UTF */ Runemax = 0x10FFFF, /* 21-bit rune */ Runemask = 0x1FFFFF, /* bits used by runes (see grep) */ }; /* * rune routines */ extern int jehanne_runetochar(char*, const Rune*); extern int jehanne_chartorune(Rune*, const char*); extern int jehanne_runelen(Rune); extern int jehanne_runenlen(const Rune*, int); extern int jehanne_fullrune(const char*, int); extern int jehanne_utflen(const char*); extern int jehanne_utfnlen(const char*, int32_t); extern char* jehanne_utfrune(const char*, Rune); extern char* jehanne_utfrrune(const char*, Rune); extern char* jehanne_utfutf(const char*, const char*); extern char* jehanne_utfecpy(char*, char *, const char*); extern Rune* jehanne_runestrcat(Rune*, const Rune*); extern Rune* jehanne_runestrchr(const Rune*, Rune); extern int jehanne_runestrcmp(const Rune*, const Rune*); extern Rune* jehanne_runestrcpy(Rune*, const Rune*); extern Rune* jehanne_runestrncpy(Rune*, const Rune*, int32_t); extern Rune* jehanne_runestrecpy(Rune*, Rune*, const Rune*); extern Rune* jehanne_runestrdup(const Rune*); extern Rune* jehanne_runestrncat(Rune*, const Rune*, int32_t); extern int jehanne_runestrncmp(const Rune*, const Rune*, int32_t); extern Rune* jehanne_runestrrchr(const Rune*, Rune); extern int32_t jehanne_runestrlen(const Rune*); extern Rune* jehanne_runestrstr(const Rune*, const Rune*); extern Rune jehanne_tolowerrune(Rune); extern Rune jehanne_totitlerune(Rune); extern Rune jehanne_toupperrune(Rune); extern Rune jehanne_tobaserune(Rune); extern int jehanne_isalpharune(Rune); extern int jehanne_isbaserune(Rune); extern int jehanne_isdigitrune(Rune); extern int jehanne_islowerrune(Rune); extern int jehanne_isspacerune(Rune); extern int jehanne_istitlerune(Rune); extern int jehanne_isupperrune(Rune); /* * malloc */ extern void* jehanne_malloc(size_t); extern void* jehanne_mallocz(uint32_t, int); extern void jehanne_free(void*); extern uint32_t jehanne_msize(void*); extern void* jehanne_mallocalign(uint32_t, uint32_t, int32_t, uint32_t); extern void* jehanne_calloc(uint32_t, size_t); extern void* jehanne_realloc(void*, size_t); void jehanne_setmalloctag(void*, uintptr_t); void jehanne_setrealloctag(void*, uintptr_t); uintptr_t jehanne_getmalloctag(void*); uintptr_t jehanne_getrealloctag(void*); void* jehanne_malloctopoolblock(void*); /* * print routines */ typedef struct Fmt Fmt; struct Fmt{ uint8_t runes; /* output buffer is runes or chars? */ void *start; /* of buffer */ void *to; /* current place in the buffer */ void *stop; /* end of the buffer; overwritten if flush fails */ int (*flush)(Fmt *); /* called when to == stop */ void *farg; /* to make flush a closure */ int nfmt; /* num chars formatted so far */ va_list args; /* args passed to dofmt */ int r; /* % format Rune */ int width; int prec; uint32_t flags; }; enum{ FmtWidth = 1, FmtLeft = FmtWidth << 1, FmtPrec = FmtLeft << 1, FmtSharp = FmtPrec << 1, FmtSpace = FmtSharp << 1, FmtSign = FmtSpace << 1, FmtZero = FmtSign << 1, FmtUnsigned = FmtZero << 1, FmtShort = FmtUnsigned << 1, FmtLong = FmtShort << 1, FmtVLong = FmtLong << 1, FmtComma = FmtVLong << 1, FmtByte = FmtComma << 1, FmtFlag = FmtByte << 1 }; extern int jehanne_print(const char*, ...); extern char* jehanne_seprint(char*, char*, const char*, ...); extern char* jehanne_vseprint(char*, char*, const char*, va_list); extern int jehanne_snprint(char*, int, const char*, ...); extern int jehanne_vsnprint(char*, int, const char*, va_list); extern char* jehanne_smprint(const char*, ...); extern char* jehanne_vsmprint(const char*, va_list); extern int jehanne_sprint(char*, const char*, ...); extern int jehanne_fprint(int, const char*, ...); extern int jehanne_vfprint(int, const char*, va_list); extern int jehanne_runesprint(Rune*, const char*, ...); extern int jehanne_runesnprint(Rune*, int, const char*, ...); extern int jehanne_runevsnprint(Rune*, int, const char*, va_list); extern Rune* jehanne_runeseprint(Rune*, Rune*, const char*, ...); extern Rune* jehanne_runevseprint(Rune*, Rune*, const char*, va_list); extern Rune* jehanne_runesmprint(const char*, ...); extern Rune* jehanne_runevsmprint(const char*, va_list); extern int jehanne_fmtfdinit(Fmt*, int, char*, int); extern int jehanne_fmtfdflush(Fmt*); extern int jehanne_fmtstrinit(Fmt*); extern char* jehanne_fmtstrflush(Fmt*); extern int jehanne_runefmtstrinit(Fmt*); extern Rune* jehanne_runefmtstrflush(Fmt*); extern int jehanne_fmtinstall(int, int (*)(Fmt*)); extern int jehanne_dofmt(Fmt*, const char*); extern int jehanne_dorfmt(Fmt*, const Rune*); extern int jehanne_fmtprint(Fmt*, const char*, ...); extern int jehanne_fmtvprint(Fmt*, const char*, va_list); extern int jehanne_fmtrune(Fmt*, int); extern int jehanne_fmtstrcpy(Fmt*, const char*); extern int jehanne_fmtrunestrcpy(Fmt*, const Rune*); /* * error string for %r * supplied on per os basis, not part of fmt library */ extern int jehanne_errfmt(Fmt *f); /* * quoted strings */ extern char *jehanne_unquotestrdup(const char*); extern Rune *jehanne_unquoterunestrdup(const Rune*); extern char *jehanne_quotestrdup(const char*); extern Rune *jehanne_quoterunestrdup(const Rune*); extern int jehanne_quotestrfmt(Fmt*); extern int jehanne_quoterunestrfmt(Fmt*); extern void jehanne_quotefmtinstall(void); extern int (*doquote)(int); extern int jehanne_needsrcquote(int); /* * random number */ extern void jehanne_srand(int32_t); extern int jehanne_rand(void); extern int jehanne_nrand(int); extern int32_t jehanne_lrand(void); extern int32_t jehanne_lnrand(int32_t); extern double jehanne_frand(void); extern uint32_t jehanne_truerand(void); /* uses /dev/random */ extern uint32_t jehanne_ntruerand(uint32_t); /* uses /dev/random */ /* * math */ extern uint32_t jehanne_getfcr(void); extern void jehanne_setfsr(uint32_t); extern uint32_t getfsr(void); extern void jehanne_setfcr(uint32_t); extern double jehanne_NaN(void); extern double jehanne_Inf(int); extern int jehanne_isNaN(double); extern int jehanne_isInf(double, int); extern uint32_t jehanne_umuldiv(uint32_t, uint32_t, uint32_t); extern int32_t jehanne_muldiv(int32_t, int32_t, int32_t); extern double jehanne_pow(double, double); extern double jehanne_atan2(double, double); extern double jehanne_fabs(double); extern double jehanne_atan(double); extern double jehanne_log(double); extern double jehanne_log10(double); extern double jehanne_exp(double); extern double jehanne_floor(double); extern double jehanne_ceil(double); extern double jehanne_hypot(double, double); extern double jehanne_sin(double); extern double jehanne_cos(double); extern double jehanne_tan(double); extern double jehanne_asin(double); extern double jehanne_acos(double); extern double jehanne_sinh(double); extern double jehanne_cosh(double); extern double jehanne_tanh(double); extern double jehanne_sqrt(double); extern double jehanne_fmod(double, double); #define HUGE 3.4028234e38 #define PIO2 1.570796326794896619231e0 #define PI (PIO2+PIO2) /* * Time-of-day */ typedef struct Tm { int sec; int min; int hour; int mday; int mon; int year; int wday; int yday; char zone[4]; int tzoff; } Tm; extern Tm* jehanne_gmtime(int32_t); extern Tm* jehanne_localtime(int32_t); extern char* jehanne_asctime(Tm*); extern char* jehanne_ctime(int32_t); extern double jehanne_cputime(void); extern int32_t jehanne_times(int32_t*); extern int32_t jehanne_tm2sec(Tm*); //extern int64_t jehanne_nsec(void); extern void cycles(uint64_t*); /* 64-bit value of the cycle counter if there is one, 0 if there isn't */ /* * one-of-a-kind */ enum { PNPROC = 1, PNGROUP = 2, }; extern void jehanne__assert(const char*) __attribute__ ((noreturn)); extern int jehanne_abs(int); extern int jehanne_atexit(void(*)(void)); extern void jehanne_atexitdont(void(*)(void)); extern int jehanne_atnotify(int(*)(void*, char*), int); extern double jehanne_atof(const char*); extern int jehanne_atoi(const char*); extern int32_t jehanne_atol(const char*); extern int64_t jehanne_atoll(const char*); extern double jehanne_charstod(int(*)(void*), void*); extern int jehanne_chdir(const char *dirname); extern char* jehanne_cleanname(char*); extern int decrypt(void*, void*, int); extern int encrypt(void*, void*, int); extern int jehanne_dec64(uint8_t*, int, const char*, int); extern int jehanne_enc64(char*, int, const uint8_t*, int); extern int jehanne_dec32(uint8_t*, int, const char*, int); extern int jehanne_enc32(char*, int, const uint8_t*, int); extern int jehanne_dec16(uint8_t*, int, const char*, int); extern int jehanne_enc16(char*, int, const uint8_t*, int); extern int jehanne_encodefmt(Fmt*); extern void jehanne_exits(const char*) __attribute__ ((noreturn)); extern double jehanne_frexp(double, int*); extern uintptr_t jehanne_getcallerpc(void); extern int jehanne_getfields(char*, char**, int, int, const char*); extern int jehanne_gettokens(char *, char **, int, const char *); extern char* jehanne_getuser(void); extern long jehanne_getwd(char*, int); extern int jehanne_iounit(int); extern int32_t jehanne_labs(int32_t); extern double jehanne_ldexp(double, int); extern void jehanne_longjmp(jmp_buf, int); extern char* jehanne_mktemp(char*); extern double jehanne_modf(double, double*); extern void jehanne_notejmp(void*, jmp_buf, int); extern unsigned long jehanne_nsec(void); extern int jehanne_dup(int oldfd, int newfd); extern int jehanne_ocreate(const char* path, unsigned int omode, unsigned int perm); extern void jehanne_perror(const char*); extern int jehanne_pipe(int pipes[2]); extern int jehanne_postnote(int, int, const char *); extern double jehanne_pow10(int); extern void jehanne_qsort(void*, long, int, int (*)(const void*, const void*)); extern void* jehanne_bsearch(const void* key, const void* base, size_t nmemb, size_t size, int (*compar)(const void*, const void*)); extern int jehanne_setjmp(jmp_buf); extern double jehanne_strtod(const char*, const char**); extern int32_t jehanne_strtol(const char*, char**, int); extern uint32_t jehanne_strtoul(const char*, char**, int); extern int64_t jehanne_strtoll(const char*, char**, int); extern uint64_t jehanne_strtoull(const char*, char**, int); extern void jehanne_sysfatal(const char*, ...) __attribute__ ((noreturn)); extern void jehanne_syslog(int, const char*, const char*, ...); extern int32_t jehanne_time(int32_t*); extern int jehanne_tolower(int); extern int jehanne_toupper(int); /* * atomic */ int32_t jehanne_ainc(int32_t*); int32_t jehanne_adec(int32_t*); #define cas(ptr, oldval, newval) __sync_bool_compare_and_swap(ptr, oldval, newval) #define casv(ptr, oldval, newval) __sync_val_compare_and_swap(ptr, oldval, newval) /* * synchronization */ typedef struct Lock { int32_t key; int32_t sem; } Lock; extern int jehanne_tsemacquire(int* addr, long ms); extern int jehanne__tas(int*); extern void jehanne_lock(Lock*); extern int jehanne_lockt(Lock*, uint32_t); extern void jehanne_unlock(Lock*); extern int jehanne_canlock(Lock*); typedef struct QLp QLp; struct QLp { uint8_t state; QLp *next; }; typedef struct QLock { Lock lock; int locked; QLp *head; QLp *tail; } QLock; extern void jehanne_qlock(QLock*); extern int jehanne_qlockt(QLock*, uint32_t); extern void jehanne_qunlock(QLock*); extern int jehanne_canqlock(QLock*); extern void jehanne__qlockinit(void* (*)(void*, void*)); /* called only by the thread library */ typedef struct RWLock { Lock lock; int _readers; /* number of readers */ int writer; /* number of writers */ QLp *head; /* list of waiting processes */ QLp *tail; } RWLock; extern void jehanne_rlock(RWLock*); extern int jehanne_rlockt(RWLock*, uint32_t); extern void jehanne_runlock(RWLock*); extern int jehanne_canrlock(RWLock*); extern void jehanne_wlock(RWLock*); extern int jehanne_wlockt(RWLock*, uint32_t); extern void jehanne_wunlock(RWLock*); extern int jehanne_canwlock(RWLock*); typedef struct Rendez { QLock *l; QLp *head; QLp *tail; } Rendez; extern void jehanne_rsleep(Rendez*); /* unlocks r->l, sleeps, locks r->l again */ extern int jehanne_rsleept(Rendez*, uint32_t); /* unlocks r->l, sleeps (up to ms), locks r->l again (if not timedout) */ extern int jehanne_rwakeup(Rendez*); extern int jehanne_rwakeupall(Rendez*); extern void** jehanne_privalloc(void); /* * network dialing */ #define NETPATHLEN 40 extern int jehanne_accept(int, const char*); extern int jehanne_announce(const char*, char*); extern int jehanne_dial(const char*, const char*, char*, int*); extern void jehanne_setnetmtpt(char*, int, const char*); extern int jehanne_hangup(int); extern int jehanne_listen(const char*, char*); extern char* jehanne_netmkaddr(const char*, const char*, const char*); extern int jehanne_reject(int, const char*, const char*); /* * encryption */ extern int jehanne_pushssl(int, const char*, const char*, const char*, int*); //extern int jehanne_pushtls(int, const char*, const char*, int, const char*, // char*); /* * network services */ typedef struct NetConnInfo NetConnInfo; struct NetConnInfo { char *dir; /* connection directory */ char *root; /* network root */ char *spec; /* binding spec */ char *lsys; /* local system */ char *lserv; /* local service */ char *rsys; /* remote system */ char *rserv; /* remote service */ char *laddr; /* local address */ char *raddr; /* remote address */ }; extern NetConnInfo* jehanne_getnetconninfo(const char*, int); extern void jehanne_freenetconninfo(NetConnInfo*); /* * system calls * */ #define STATMAX 65535U /* max length of machine-independent stat structure */ #define DIRMAX (sizeof(Dir)+STATMAX) /* max length of Dir structure */ #define ERRMAX 128 /* max length of error string */ #define MORDER 0x0003 /* mask for bits defining order of mounting */ #define MREPL 0x0000 /* mount replaces object */ #define MBEFORE 0x0001 /* mount goes before others in union directory */ #define MAFTER 0x0002 /* mount goes after others in union directory */ #define MCREATE 0x0004 /* permit creation in mounted directory */ #define MCACHE 0x0010 /* cache some data */ #define MMASK 0x0017 /* all bits on */ /* Open modes: Kernel reserved flags */ #define OSTAT 0x00 /* open for stat/wstat */ #define OREAD 0x01 /* open for read */ #define OWRITE 0x02 /* write */ #define ORDWR (OREAD|OWRITE) /* read and write */ #define OEXEC 0x04 /* execute, == read but check execute permission */ #define OCEXEC 0x08 /* or'ed in, close on exec */ #define ORCLOSE 0x10 /* or'ed in, remove on close */ #define OKMODE 0xff /* least significant byte reserved for kernel use */ /* Open modes: Popular flags among filesystems */ #define OTRUNC 0x0100 /* or'ed in (except for exec), truncate file first */ /* Access modes */ #define AEXIST 0 /* accessible: exists */ #define AREAD 4 /* read ccess */ #define AWRITE 2 /* write access */ #define AEXEC 1 /* execute access */ #define AMASK (AEXIST|AREAD|AWRITE|AEXEC) /* Segattch */ #define SG_RONLY 0040 /* read only */ #define SG_CEXEC 0100 /* detach on exec */ #define NCONT 0 /* continue after note */ #define NDFLT 1 /* terminate after note */ #define NSAVE 2 /* clear note but hold state */ #define NRSTR 3 /* restore saved state */ /* bits in Qid.type */ #define QTDIR 0x80 /* type bit for directories */ #define QTAPPEND 0x40 /* type bit for append only files */ #define QTEXCL 0x20 /* type bit for exclusive use files */ #define QTMOUNT 0x10 /* type bit for mounted channel */ #define QTAUTH 0x08 /* type bit for authentication file */ #define QTTMP 0x04 /* type bit for not-backed-up file */ #define QTFILE 0x00 /* plain file */ /* bits in Dir.mode */ #define DMDIR 0x80000000 /* mode bit for directories */ #define DMAPPEND 0x40000000 /* mode bit for append only files */ #define DMEXCL 0x20000000 /* mode bit for exclusive use files */ #define DMMOUNT 0x10000000 /* mode bit for mounted channel */ #define DMAUTH 0x08000000 /* mode bit for authentication file */ #define DMTMP 0x04000000 /* mode bit for non-backed-up files */ #define DMREAD 0x4 /* mode bit for read permission */ #define DMWRITE 0x2 /* mode bit for write permission */ #define DMEXEC 0x1 /* mode bit for execute permission */ /* rfork */ enum { RFNAMEG = (1<<0), RFENVG = (1<<1), RFFDG = (1<<2), RFNOTEG = (1<<3), RFPROC = (1<<4), RFMEM = (1<<5), RFNOWAIT = (1<<6), RFCNAMEG = (1<<10), RFCENVG = (1<<11), RFCFDG = (1<<12), RFREND = (1<<13), RFNOMNT = (1<<14) }; typedef struct Qid { uint64_t path; uint32_t vers; uint8_t type; } Qid; typedef struct Dir { /* system-modified data */ uint16_t type; /* server type */ uint32_t dev; /* server subtype */ /* file data */ Qid qid; /* unique id from server */ uint32_t mode; /* permissions */ uint32_t atime; /* last read time */ uint32_t mtime; /* last write time */ int64_t length; /* file length */ char *name; /* last element of path */ char *uid; /* owner name */ char *gid; /* group name */ char *muid; /* last modifier name */ } Dir; /* keep /sys/src/ape/lib/ap/plan9/sys9.h in sync with this -rsc */ typedef struct Waitmsg { pid_t pid; /* of loved one */ uint32_t time[3]; /* of loved one & descendants */ char msg[]; } Waitmsg; extern int jehanne_access(const char*, int); extern int jehanne_awakened(int64_t); extern int jehanne_brk(void*); extern int jehanne_execl(const char*, ...); extern int jehanne_forgivewkp(int64_t); extern pid_t jehanne_fork(void); extern int jehanne_pexec(const char* cmd, char* args[]); extern int32_t jehanne_readn(int, void*, int32_t); extern void* jehanne_segbrk(uint32_t); #define sbrk(incr) jehanne_segbrk(incr) extern void* jehanne_segattach(int, const char*, void*, unsigned long); extern int jehanne_segdetach(void*); extern int jehanne_segfree(void*, unsigned long); extern void jehanne_sleep(unsigned int millisecs); extern int jehanne_stat(const char*, uint8_t*, int); extern Waitmsg* jehanne_wait(void); extern int jehanne_waitpid(void); extern int jehanne_wstat(const char*, uint8_t*, int); extern long jehanne_read(int, void*, int32_t); extern long jehanne_write(int, const void*, int32_t); extern Dir* jehanne_dirstat(const char*); extern Dir* jehanne_dirfstat(int); extern int jehanne_dirwstat(const char*, Dir*); extern int jehanne_dirfwstat(int, Dir*); extern int32_t jehanne_dirread(int, Dir**); extern void jehanne_nulldir(Dir*); extern int32_t jehanne_dirreadall(int, Dir**); extern int32_t jehanne_getpid(void); extern int32_t jehanne_getppid(void); extern int32_t jehanne_getmainpid(void); extern void jehanne_rerrstr(char*, uint32_t); extern char* jehanne_sysname(void); extern void jehanne_werrstr(const char*, ...); extern unsigned int jehanne_convM2D(uint8_t*, uint, Dir*, char*); extern unsigned int jehanne_convD2M(Dir*, uint8_t*, uint); extern unsigned int jehanne_sizeD2M(Dir*); extern int jehanne_dirmodefmt(Fmt*); #ifndef NPRIVATES # define NPRIVATES 16 #endif /* compiler directives on plan 9 */ #define SET(x) ((x)=0) #define USED(x) if(x){}else{} #ifdef __GNUC__ # if __GNUC__ >= 3 # undef USED # define USED(x) ((void)(x)) # endif #endif extern char *argv0; /* #define ARGBEGIN for((argv0||(argv0=*argv)),argv++,argc--;\ */ #define ARGBEGIN if(argv0==nil){\ argv0=*argv;\ }\ for(argv++,argc--;\ argv[0] && argv[0][0]=='-' && argv[0][1];\ argc--, argv++) {\ char *_args, *_argt;\ Rune _argc;\ _args = &argv[0][1];\ if(_args[0]=='-' && _args[1]==0){\ argc--; argv++; break;\ }\ _argc = 0;\ while(*_args && (_args += jehanne_chartorune(&_argc, _args)))\ switch(_argc) /* #define ARGEND SET(_argt);USED(_argt,_argc,_args);}USED(argv, argc); */ #define ARGEND SET(_argt);USED(_argt);USED(_argc);USED(_args);}USED(argv);USED(argc); #define ARGF() (_argt=_args, _args="",\ (*_argt? _argt: argv[1]? (argc--, *++argv): 0)) #define EARGF(x) (_argt=_args, _args="",\ (*_argt? _argt: argv[1]? (argc--, *++argv): ((x), argc = *(int*)0, (char*)0))) #define ARGC() _argc /* this is used by segbrk and brk, it's a really bad idea to redefine it */ extern char end[];