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plan9fox/sys/include/libc.h
Ori Bernstein e934530ee4 libc: add encode(2) variants for custom alphabets 
There are a number of alphabets in common use for base32
and base64 encoding, such as url-safe encodings.

This adds support for passing a function to encode into
arbitary alphabets.
2021-07-03 20:03:17 +00:00

776 lines
21 KiB
C
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#pragma lib "libc.a"
#pragma src "/sys/src/libc"
#define nelem(x) (sizeof(x)/sizeof((x)[0]))
#define offsetof(s, m) (ulong)(&(((s*)0)->m))
#define assert(x) if(x){}else _assert("x")
/*
* mem routines
*/
extern void* memccpy(void*, void*, int, ulong);
extern void* memset(void*, int, ulong);
extern int memcmp(void*, void*, ulong);
extern void* memcpy(void*, void*, ulong);
extern void* memmove(void*, void*, ulong);
extern void* memchr(void*, int, ulong);
/*
* string routines
*/
extern char* strcat(char*, char*);
extern char* strchr(char*, int);
extern int strcmp(char*, char*);
extern char* strcpy(char*, char*);
extern char* strecpy(char*, char*, char*);
extern char* strdup(char*);
extern char* strncat(char*, char*, long);
extern char* strncpy(char*, char*, long);
extern int strncmp(char*, char*, long);
extern char* strpbrk(char*, char*);
extern char* strrchr(char*, int);
extern char* strtok(char*, char*);
extern long strlen(char*);
extern long strspn(char*, char*);
extern long strcspn(char*, char*);
extern char* strstr(char*, char*);
extern int cistrncmp(char*, char*, int);
extern int cistrcmp(char*, char*);
extern char* cistrstr(char*, char*);
extern int 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 runetochar(char*, Rune*);
extern int chartorune(Rune*, char*);
extern int runelen(long);
extern int runenlen(Rune*, int);
extern int fullrune(char*, int);
extern int utflen(char*);
extern int utfnlen(char*, long);
extern char* utfrune(char*, long);
extern char* utfrrune(char*, long);
extern char* utfutf(char*, char*);
extern char* utfecpy(char*, char*, char*);
extern Rune* runestrcat(Rune*, Rune*);
extern Rune* runestrchr(Rune*, Rune);
extern int runestrcmp(Rune*, Rune*);
extern Rune* runestrcpy(Rune*, Rune*);
extern Rune* runestrncpy(Rune*, Rune*, long);
extern Rune* runestrecpy(Rune*, Rune*, Rune*);
extern Rune* runestrdup(Rune*);
extern Rune* runestrncat(Rune*, Rune*, long);
extern int runestrncmp(Rune*, Rune*, long);
extern Rune* runestrrchr(Rune*, Rune);
extern long runestrlen(Rune*);
extern Rune* runestrstr(Rune*, Rune*);
extern Rune tolowerrune(Rune);
extern Rune totitlerune(Rune);
extern Rune toupperrune(Rune);
extern int isalpharune(Rune);
extern int islowerrune(Rune);
extern int isspacerune(Rune);
extern int istitlerune(Rune);
extern int isupperrune(Rune);
extern int isdigitrune(Rune);
/*
* malloc
*/
extern void* malloc(ulong);
extern void* mallocz(ulong, int);
extern void free(void*);
extern ulong msize(void*);
extern void* mallocalign(ulong, ulong, long, ulong);
extern void* calloc(ulong, ulong);
extern void* realloc(void*, ulong);
extern void setmalloctag(void*, uintptr);
extern void setrealloctag(void*, uintptr);
extern uintptr getmalloctag(void*);
extern uintptr getrealloctag(void*);
extern void* malloctopoolblock(void*);
/*
* print routines
*/
typedef struct Fmt Fmt;
struct Fmt{
uchar 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;
ulong 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 print(char*, ...);
extern char* seprint(char*, char*, char*, ...);
extern char* vseprint(char*, char*, char*, va_list);
extern int snprint(char*, int, char*, ...);
extern int vsnprint(char*, int, char*, va_list);
extern char* smprint(char*, ...);
extern char* vsmprint(char*, va_list);
extern int sprint(char*, char*, ...);
extern int fprint(int, char*, ...);
extern int vfprint(int, char*, va_list);
extern int runesprint(Rune*, char*, ...);
extern int runesnprint(Rune*, int, char*, ...);
extern int runevsnprint(Rune*, int, char*, va_list);
extern Rune* runeseprint(Rune*, Rune*, char*, ...);
extern Rune* runevseprint(Rune*, Rune*, char*, va_list);
extern Rune* runesmprint(char*, ...);
extern Rune* runevsmprint(char*, va_list);
extern int fmtfdinit(Fmt*, int, char*, int);
extern int fmtfdflush(Fmt*);
extern int fmtstrinit(Fmt*);
extern char* fmtstrflush(Fmt*);
extern int runefmtstrinit(Fmt*);
extern Rune* runefmtstrflush(Fmt*);
#pragma varargck argpos fmtprint 2
#pragma varargck argpos fprint 2
#pragma varargck argpos print 1
#pragma varargck argpos runeseprint 3
#pragma varargck argpos runesmprint 1
#pragma varargck argpos runesnprint 3
#pragma varargck argpos runesprint 2
#pragma varargck argpos seprint 3
#pragma varargck argpos smprint 1
#pragma varargck argpos snprint 3
#pragma varargck argpos sprint 2
#pragma varargck type "lld" vlong
#pragma varargck type "llo" vlong
#pragma varargck type "llx" vlong
#pragma varargck type "llb" vlong
#pragma varargck type "lld" uvlong
#pragma varargck type "llo" uvlong
#pragma varargck type "llx" uvlong
#pragma varargck type "llb" uvlong
#pragma varargck type "ld" long
#pragma varargck type "lo" long
#pragma varargck type "lx" long
#pragma varargck type "lb" long
#pragma varargck type "ld" ulong
#pragma varargck type "lo" ulong
#pragma varargck type "lx" ulong
#pragma varargck type "lb" ulong
#pragma varargck type "zd" intptr
#pragma varargck type "zo" intptr
#pragma varargck type "zx" intptr
#pragma varargck type "zb" intptr
#pragma varargck type "zd" uintptr
#pragma varargck type "zo" uintptr
#pragma varargck type "zx" uintptr
#pragma varargck type "zb" uintptr
#pragma varargck type "d" int
#pragma varargck type "o" int
#pragma varargck type "x" int
#pragma varargck type "c" int
#pragma varargck type "C" int
#pragma varargck type "b" int
#pragma varargck type "d" uint
#pragma varargck type "x" uint
#pragma varargck type "c" uint
#pragma varargck type "C" uint
#pragma varargck type "b" uint
#pragma varargck type "f" double
#pragma varargck type "e" double
#pragma varargck type "g" double
#pragma varargck type "s" char*
#pragma varargck type "q" char*
#pragma varargck type "S" Rune*
#pragma varargck type "Q" Rune*
#pragma varargck type "r" void
#pragma varargck type "%" void
#pragma varargck type "n" int*
#pragma varargck type "p" uintptr
#pragma varargck type "p" void*
#pragma varargck flag ','
#pragma varargck flag ' '
#pragma varargck flag 'h'
#pragma varargck type "<" void*
#pragma varargck type "[" void*
#pragma varargck type "H" void*
#pragma varargck type "lH" void*
extern int fmtinstall(int, int (*)(Fmt*));
extern int dofmt(Fmt*, char*);
extern int dorfmt(Fmt*, Rune*);
extern int fmtprint(Fmt*, char*, ...);
extern int fmtvprint(Fmt*, char*, va_list);
extern int fmtrune(Fmt*, int);
extern int fmtstrcpy(Fmt*, char*);
extern int fmtrunestrcpy(Fmt*, Rune*);
/*
* error string for %r
* supplied on per os basis, not part of fmt library
*/
extern int errfmt(Fmt *f);
/*
* quoted strings
*/
extern char *unquotestrdup(char*);
extern Rune *unquoterunestrdup(Rune*);
extern char *quotestrdup(char*);
extern Rune *quoterunestrdup(Rune*);
extern int quotestrfmt(Fmt*);
extern int quoterunestrfmt(Fmt*);
extern void quotefmtinstall(void);
extern int (*doquote)(int);
extern int needsrcquote(int);
/*
* random number
*/
extern void srand(long);
extern int rand(void);
extern int nrand(int);
extern long lrand(void);
extern long lnrand(long);
extern double frand(void);
extern ulong truerand(void); /* uses /dev/random */
extern ulong ntruerand(ulong); /* uses /dev/random */
/*
* math
*/
extern ulong getfcr(void);
extern void setfsr(ulong);
extern ulong getfsr(void);
extern void setfcr(ulong);
extern double NaN(void);
extern double Inf(int);
extern int isNaN(double);
extern int isInf(double, int);
extern ulong umuldiv(ulong, ulong, ulong);
extern long muldiv(long, long, long);
extern double pow(double, double);
extern double atan2(double, double);
extern double fabs(double);
extern double atan(double);
extern double log(double);
extern double log10(double);
extern double exp(double);
extern double floor(double);
extern double ceil(double);
extern double hypot(double, double);
extern double sin(double);
extern double cos(double);
extern double tan(double);
extern double asin(double);
extern double acos(double);
extern double sinh(double);
extern double cosh(double);
extern double tanh(double);
extern double sqrt(double);
extern double fmod(double, double);
#define HUGE 3.4028234e38
#define PIO2 1.570796326794896619231e0
#define PI (PIO2+PIO2)
/*
* Time-of-day
*/
typedef struct Tzone Tzone;
#pragma incomplete Tzone
typedef
struct Tm
{
int nsec; /* nseconds (range 0...1e9) */
int sec; /* seconds (range 0..60) */
int min; /* minutes (0..59) */
int hour; /* hours (0..23) */
int mday; /* day of the month (1..31) */
int mon; /* month of the year (0..11) */
int year; /* year A.D. */
int wday; /* day of week (0..6, Sunday = 0) */
int yday; /* day of year (0..365) */
char zone[16]; /* time zone name */
int tzoff; /* time zone delta from GMT */
Tzone *tz; /* time zone associated with this date */
} Tm;
typedef
struct Tmfmt {
char *fmt;
Tm *tm;
} Tmfmt;
#pragma varargck type "τ" Tmfmt
extern Tzone* tzload(char *name);
extern Tm* tmnow(Tm*, Tzone*);
extern Tm* tmtime(Tm*, vlong, Tzone*);
extern Tm* tmtimens(Tm*, vlong, int, Tzone*);
extern Tm* tmparse(Tm*, char*, char*, Tzone*, char **ep);
extern vlong tmnorm(Tm*);
extern Tmfmt tmfmt(Tm*, char*);
extern void tmfmtinstall(void);
extern Tm* gmtime(long);
extern Tm* localtime(long);
extern char* asctime(Tm*);
extern char* ctime(long);
extern double cputime(void);
extern long times(long*);
extern long tm2sec(Tm*);
extern vlong nsec(void);
extern void cycles(uvlong*); /* 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 _assert(char*);
extern int abs(int);
extern int atexit(void(*)(void));
extern void atexitdont(void(*)(void));
extern int atnotify(int(*)(void*, char*), int);
extern double atof(char*);
extern int atoi(char*);
extern long atol(char*);
extern vlong atoll(char*);
extern double charstod(int(*)(void*), void*);
extern char* cleanname(char*);
extern int decrypt(void*, void*, int);
extern int encrypt(void*, void*, int);
extern int dec64(uchar*, int, char*, int);
extern int enc64(char*, int, uchar*, int);
extern int dec64x(uchar*, int, char*, int, int (*)(int));
extern int enc64x(char*, int, uchar*, int, int (*)(int));
extern int dec32(uchar*, int, char*, int);
extern int enc32(char*, int, uchar*, int);
extern int dec32x(uchar*, int, char*, int, int (*)(int));
extern int enc32x(char*, int, uchar*, int, int (*)(int));
extern int dec16(uchar*, int, char*, int);
extern int enc16(char*, int, uchar*, int);
extern int dec64chr(int);
extern int enc64chr(int);
extern int dec32chr(int);
extern int enc32chr(int);
extern int dec16chr(int);
extern int enc16chr(int);
extern int encodefmt(Fmt*);
extern void exits(char*);
extern double frexp(double, int*);
extern uintptr getcallerpc(void*);
extern char* getenv(char*);
extern int getfields(char*, char**, int, int, char*);
extern int gettokens(char *, char **, int, char *);
extern char* getuser(void);
extern char* getwd(char*, int);
extern int iounit(int);
extern long labs(long);
extern double ldexp(double, int);
extern void longjmp(jmp_buf, int);
extern char* mktemp(char*);
extern double modf(double, double*);
extern int netcrypt(void*, void*);
extern void notejmp(void*, jmp_buf, int);
extern void perror(char*);
extern int postnote(int, int, char *);
extern double pow10(int);
extern int putenv(char*, char*);
extern void qsort(void*, long, long, int (*)(void*, void*));
extern int setjmp(jmp_buf);
extern double strtod(char*, char**);
extern long strtol(char*, char**, int);
extern ulong strtoul(char*, char**, int);
extern vlong strtoll(char*, char**, int);
extern uvlong strtoull(char*, char**, int);
extern void sysfatal(char*, ...);
#pragma varargck argpos sysfatal 1
extern void syslog(int, char*, char*, ...);
#pragma varargck argpos syslog 3
extern long time(long*);
extern int tolower(int);
extern int toupper(int);
/*
* profiling
*/
enum {
Profoff, /* No profiling */
Profuser, /* Measure user time only (default) */
Profkernel, /* Measure user + kernel time */
Proftime, /* Measure total time */
Profsample, /* Use clock interrupt to sample (default when there is no cycle counter) */
}; /* what */
extern void prof(void (*fn)(void*), void *arg, int entries, int what);
/*
* synchronization
*/
typedef
struct Lock {
int val;
} Lock;
extern int _tas(int*);
extern void lock(Lock*);
extern void unlock(Lock*);
extern int canlock(Lock*);
typedef struct QLp QLp;
struct QLp
{
int inuse;
int state;
QLp *next;
};
typedef
struct QLock
{
Lock lock;
int locked;
QLp *head;
QLp *tail;
} QLock;
extern void qlock(QLock*);
extern void qunlock(QLock*);
extern int canqlock(QLock*);
extern void _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 rlock(RWLock*);
extern void runlock(RWLock*);
extern int canrlock(RWLock*);
extern void wlock(RWLock*);
extern void wunlock(RWLock*);
extern int canwlock(RWLock*);
typedef
struct Rendez
{
QLock *l;
QLp *head;
QLp *tail;
} Rendez;
extern void rsleep(Rendez*); /* unlocks r->l, sleeps, locks r->l again */
extern int rwakeup(Rendez*);
extern int rwakeupall(Rendez*);
extern void** privalloc(void);
extern void procsetname(char*, ...);
#pragma varargck argpos procsetname 1
/*
* network dialing
*/
#define NETPATHLEN 40
extern int accept(int, char*);
extern int announce(char*, char*);
extern int dial(char*, char*, char*, int*);
extern void setnetmtpt(char*, int, char*);
extern int hangup(int);
extern int listen(char*, char*);
extern char* netmkaddr(char*, char*, char*);
extern int reject(int, char*, char*);
/*
* encryption
*/
extern int pushssl(int, char*, char*, char*, int*);
extern int pushtls(int, char*, char*, int, 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* getnetconninfo(char*, int);
extern void freenetconninfo(NetConnInfo*);
extern int idn2utf(char*, char*, int);
extern int utf2idn(char*, char*, int);
/*
* 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 */
#define OREAD 0 /* open for read */
#define OWRITE 1 /* write */
#define ORDWR 2 /* read and write */
#define OEXEC 3 /* execute, == read but check execute permission */
#define OTRUNC 16 /* or'ed in (except for exec), truncate file first */
#define OCEXEC 32 /* or'ed in, close on exec */
#define ORCLOSE 64 /* or'ed in, remove on close */
#define OEXCL 0x1000 /* or'ed in, exclusive use (create only) */
#define AEXIST 0 /* accessible: exists */
#define AEXEC 1 /* execute access */
#define AWRITE 2 /* write access */
#define AREAD 4 /* read access */
/* 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
{
uvlong path;
ulong vers;
uchar type;
} Qid;
typedef
struct Dir {
/* system-modified data */
ushort type; /* server type */
uint dev; /* server subtype */
/* file data */
Qid qid; /* unique id from server */
ulong mode; /* permissions */
ulong atime; /* last read time */
ulong mtime; /* last write time */
vlong 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
{
int pid; /* of loved one */
ulong time[3]; /* of loved one & descendants */
char *msg;
} Waitmsg;
typedef
struct IOchunk
{
void *addr;
ulong len;
} IOchunk;
extern void _exits(char*);
extern void abort(void);
extern int access(char*, int);
extern long alarm(ulong);
extern int await(char*, int);
extern int bind(char*, char*, int);
extern int brk(void*);
extern int chdir(char*);
extern int close(int);
extern int create(char*, int, ulong);
extern int dup(int, int);
extern int errstr(char*, uint);
extern int exec(char*, char*[]);
extern int execl(char*, ...);
extern int fork(void);
extern int rfork(int);
extern int fauth(int, char*);
extern int fstat(int, uchar*, int);
extern int fwstat(int, uchar*, int);
extern int fversion(int, int, char*, int);
extern int mount(int, int, char*, int, char*);
extern int unmount(char*, char*);
extern int noted(int);
extern int notify(void(*)(void*, char*));
extern int open(char*, int);
extern int fd2path(int, char*, int);
extern int pipe(int*);
extern long pread(int, void*, long, vlong);
extern long preadv(int, IOchunk*, int, vlong);
extern long pwrite(int, void*, long, vlong);
extern long pwritev(int, IOchunk*, int, vlong);
extern long read(int, void*, long);
extern long readn(int, void*, long);
extern long readv(int, IOchunk*, int);
extern int remove(char*);
extern void* sbrk(ulong);
extern long oseek(int, long, int);
extern vlong seek(int, vlong, int);
extern void* segattach(int, char*, void*, ulong);
extern void* segbrk(void*, void*);
extern int segdetach(void*);
extern int segflush(void*, ulong);
extern int segfree(void*, ulong);
extern int semacquire(long*, int);
extern long semrelease(long*, long);
extern int sleep(long);
extern int stat(char*, uchar*, int);
extern int tsemacquire(long*, ulong);
extern Waitmsg* wait(void);
extern int waitpid(void);
extern long write(int, void*, long);
extern long writev(int, IOchunk*, int);
extern int wstat(char*, uchar*, int);
extern void* rendezvous(void*, void*);
extern Dir* dirstat(char*);
extern Dir* dirfstat(int);
extern int dirwstat(char*, Dir*);
extern int dirfwstat(int, Dir*);
extern long dirread(int, Dir**);
extern void nulldir(Dir*);
extern long dirreadall(int, Dir**);
extern int getpid(void);
extern int getppid(void);
extern void rerrstr(char*, uint);
extern char* sysname(void);
extern void werrstr(char*, ...);
#pragma varargck argpos werrstr 1
extern long ainc(long*);
extern long adec(long*);
extern char *argv0;
#define ARGBEGIN for((argv0||(argv0=*argv)),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 += chartorune(&_argc, _args)))\
switch(_argc)
#define ARGEND SET(_argt);USED(_argt,_argc,_args);}USED(argv, 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), abort(), (char*)0)))
#define ARGC() _argc
/* this is used by sbrk and brk, it's a really bad idea to redefine it */
extern char end[];
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