int __dtostr(double d,char *buf,unsigned int maxlen,unsigned int prec,unsigned int prec2) {
#if 1
union {
unsigned long long l;
double d;
} u = { .d=d };
/* step 1: extract sign, mantissa and exponent */
signed long e=((u.l>>52)&((1<<11)-1))-1023;
#else
#if __BYTE_ORDER == __LITTLE_ENDIAN
signed long e=(((((unsigned long*)&d)[1])>>20)&((1<<11)-1))-1023;
#else
signed long e=(((*((unsigned long*)&d))>>20)&((1<<11)-1))-1023;
#endif
#endif
/* unsigned long long m=u.l & ((1ull<<52)-1); */
/* step 2: exponent is base 2, compute exponent for base 10 */
signed long e10;
/* step 3: calculate 10^e10 */
unsigned int i;
double backup=d;
double tmp;
char *oldbuf=buf;
if ((i=isinf(d))) return copystring(buf,maxlen,i>0?"inf":"-inf");
if (isnan(d)) return copystring(buf,maxlen,"nan");
e10=1+(long)(e*0.30102999566398119802); /* log10(2) */
/* Wir iterieren von Links bis wir bei 0 sind oder maxlen erreicht
* ist. Wenn maxlen erreicht ist, machen wir das nochmal in
* scientific notation. Wenn dann von prec noch was übrig ist, geben
* wir einen Dezimalpunkt aus und geben prec2 Nachkommastellen aus.
* Wenn prec2 Null ist, geben wir so viel Stellen aus, wie von prec
* noch übrig ist. */
if (d==0.0) {
prec2=prec2==0?1:prec2+2;
prec2=prec2>maxlen?8:prec2;
i=0;
if (prec2 && (long long)u.l<0) { buf[0]='-'; ++i; }
for (; i<prec2; ++i) buf[i]='0';
buf[buf[0]=='0'?1:2]='.'; buf[i]=0;
return i;
}
if (d < 0.0) { d=-d; *buf='-'; --maxlen; ++buf; }
/*
Perform rounding. It needs to be done before we generate any
digits as the carry could propagate through the whole number.
*/
tmp = 0.5;
for (i = 0; i < prec2; i++) { tmp *= 0.1; }
d += tmp;
if (d < 1.0) { *buf='0'; --maxlen; ++buf; }
/* printf("e=%d e10=%d prec=%d\n",e,e10,prec); */
if (e10>0) {
int first=1; /* are we about to write the first digit? */
tmp = 10.0;
i=e10;
while (i>10) { tmp=tmp*1e10; i-=10; }
while (i>1) { tmp=tmp*10; --i; }
/* the number is greater than 1. Iterate through digits before the
* decimal point until we reach the decimal point or maxlen is
* reached (in which case we switch to scientific notation). */
while (tmp>0.9) {
char digit;
double fraction=d/tmp;
digit=(int)(fraction); /* floor() */
if (!first || digit) {
first=0;
*buf=digit+'0'; ++buf;
if (!maxlen) {
/* use scientific notation */
int len=__dtostr(backup/tmp,oldbuf,maxlen,prec,prec2);
int initial=1;
if (len==0) return 0;
maxlen-=len; buf+=len;
if (maxlen>0) {
*buf='e';
++buf;
}
--maxlen;
for (len=1000; len>0; len/=10) {
if (e10>=len || !initial) {
if (maxlen>0) {
*buf=(e10/len)+'0';
++buf;
}
--maxlen;
initial=0;
e10=e10%len;
}
}
if (maxlen>0) goto fini;
return 0;
}
d-=digit*tmp;
--maxlen;
}
tmp/=10.0;
}
}
else
{
tmp = 0.1;
}
if (buf==oldbuf) {
if (!maxlen) return 0; --maxlen;
*buf='0'; ++buf;
}
if (prec2 || prec>(unsigned int)(buf-oldbuf)+1) { /* more digits wanted */
if (!maxlen) return 0; --maxlen;
*buf='.'; ++buf;
prec-=buf-oldbuf-1;
if (prec2) prec=prec2;
if (prec>maxlen) return 0;
while (prec>0) {
char digit;
double fraction=d/tmp;
digit=(int)(fraction); /* floor() */
*buf=digit+'0'; ++buf;
d-=digit*tmp;
tmp/=10.0;
--prec;
}
}
fini:
*buf=0;
return buf-oldbuf;
}
int main(int argc,char *argv[]) {
int i;
for (i=0; i<1024; ++i) {
printf("%08x%c",arc4random(),(i&15)==15 ? '\n' : ' ');
}
perror("write");
#if 0
int n;
struct ucontext uc;
n=0;
getcontext(&uc);
puts("getcontext returned");
if (n==0) {
++n;
setcontext(&uc);
puts("should not get here");
exit(1);
}
puts("all ok");
return 0;
#endif
#if 0
char* a=malloc(-3);
char* b=malloc(0xffffffffull+1);
printf("%p %p\n",a,b);
#endif
#if 0
printf("%u\n",getpagesize());
#endif
#if 0
struct stat s;
time_t t=time(0);
struct tm* T;
stat("/tmp/nyt.html",&s);
T=gmtime(&s.st_mtime);
#endif
#if 0
static struct mq_attr x;
mqd_t a=mq_open("fnord",O_WRONLY|O_CREAT,0600,&x);
mqd_t b=mq_open("fnord",O_RDONLY);
#endif
#if 0
struct statfs s;
if (statfs("/tmp",&s)!=-1) {
printf("%llu blocks, %llu free\n",(unsigned long long)s.f_blocks,(unsigned long long)s.f_bfree);
}
#endif
#if 0
char* c=strndupa("fnord",3);
puts(c);
#endif
#if 0
char buf[100];
__write2("foo!\n");
memset(buf,0,200);
#endif
#if 0
printf("%+05d\n",500);
#endif
#if 0
char* c;
printf("%d\n",asprintf(&c,"foo %d",23));
puts(c);
#endif
#if 0
struct winsize ws;
if (!ioctl(0, TIOCGWINSZ, &ws)) {
printf("%dx%d\n",ws.ws_col,ws.ws_row);
}
#endif
#if 0
struct termios t;
if (tcgetattr(1,&t)) {
puts("tcgetattr failed!");
return 1;
}
printf("%d\n",cfgetospeed(&t));
#endif
#if 0
printf("%p\n",malloc(0));
#endif
#if 0
char* argv[]= {"sh","-i",0};
char buf[PATH_MAX+100];
int i;
for (i=0; i<PATH_MAX+20; ++i) buf[i]='a';
memmove(buf,"PATH=/",6);
strcpy(buf+i,"/bin:/bin");
putenv(buf);
execvp("sh",argv);
printf("%d\n",islower(0xfc));
#endif
#if 0
char buf[101];
__dtostr(-123456789.456,buf,100,6,2);
puts(buf);
return 0;
#endif
#if 0
time_t t=1009921588;
puts(asctime(localtime(&t)));
#endif
#if 0
printf("%g\n",atof("30"));
#endif
#if 0
char* buf[]= {"FOO=FNORD","A=B","C=D","PATH=/usr/bin:/bin",0};
environ=buf;
putenv("FOO=BAR");
putenv("FOO=BAZ");
putenv("BLUB=DUH");
system("printenv");
#endif
#if 0
char buf[1024];
time_t t1=time(0);
struct tm* t=localtime(&t1);
printf("%d %s\n",strftime(buf,sizeof buf,"%b %d %H:%M",t),buf);
#endif
#if 0
tzset();
printf("%d\n",daylight);
#endif
#if 0
struct in_addr addr;
inet_aton("10.0.0.100\t",&addr);
printf("%s\n",inet_ntoa(addr));
#endif
#if 0
printf("%u\n",getuid32());
#endif
#if 0
FILE *f;
int i;
char addr6p[8][5];
int plen, scope, dad_status, if_idx;
char addr6[40], devname[20];
if ((f = fopen("/proc/net/if_inet6", "r")) != NULL) {
while ((i=fscanf(f, "%4s%4s%4s%4s%4s%4s%4s%4s %02x %02x %02x %02x %20s\n",
addr6p[0], addr6p[1], addr6p[2], addr6p[3],
addr6p[4], addr6p[5], addr6p[6], addr6p[7],
&if_idx, &plen, &scope, &dad_status, devname)) != EOF) {
printf("i=%d\n",i);
}
}
#endif
#if 0
printf("%s\n",crypt("test","$1$"));
#endif
#if 0
MD5_CTX x;
unsigned char md5[16];
MD5Init(&x);
MD5Update(&x,"a",1);
MD5Final(md5,&x);
{
int i;
for (i=0; i<16; ++i) {
printf("%02x",md5[i]);
}
putchar('\n');
}
#endif
#if 0
long a,b,c;
char buf[20]="fnord";
strcpy(buf,"Fnordhausen");
strcpy2(buf,"Fnordhausen");
rdtscl(a);
strcpy(buf,"Fnordhausen");
rdtscl(b);
strcpy2(buf,"Fnordhausen");
rdtscl(c);
printf("C: %d ticks, asm: %d ticks\n",b-a,c-b);
#endif
/* printf("%d\n",strcmp(buf,"fnord")); */
#if 0
regex_t r;
// printf("regcomp %d\n",regcomp(&r,"^(re([\\[0-9\\]+])*|aw):[ \t]*",REG_EXTENDED));
printf("regcomp %d\n",regcomp(&r,"^([A-Za-z ]+>|[]>:|}-][]>:|}-]*)",REG_EXTENDED));
printf("regexec %d\n",regexec(&r,"Marketing-Laufbahn hinterdir.",1,0,REG_NOSUB));
#endif
#if 0
FILE *f=fopen("/home/leitner/Mail/outbox","r");
char buf[1024];
int i=0;
if (f) {
while (fgets(buf,1023,f)) {
++i;
printf("%d %lu %s",i,ftell(f),buf);
}
}
#endif
#if 0
char template[]="/tmp/duh/fnord-XXXXXX";