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Enhance the logest.c utility with new operators: "dup", "inv", "log", and

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"nlogn".  Provide help on an invalid input.

FossilOrigin-Name: b4bd2a062c4baf5f622d61b7411f00de5904ef56
This commit is contained in:
drh 2014-03-27 14:05:38 +00:00
parent 68916c9fd3
commit 382bdeabef
3 changed files with 52 additions and 26 deletions
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14
manifest
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@ -1,5 +1,5 @@
C Add\san\sextra\stest\scase\sfor\sthe\spotential\sbuffer\soverread\spatched\sby\s[28ddecff04].
D 2014-03-26T15:14:59.762
C Enhance\sthe\slogest.c\sutility\swith\snew\soperators:\s"dup",\s"inv",\s"log",\sand\n"nlogn".\s\sProvide\shelp\son\san\sinvalid\sinput.
D 2014-03-27T14:05:38.733
F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
F Makefile.in 2ef13430cd359f7b361bb863504e227b25cc7f81
F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@ -1121,7 +1121,7 @@ F tool/genfkey.test 4196a8928b78f51d54ef58e99e99401ab2f0a7e5
F tool/getlock.c f4c39b651370156cae979501a7b156bdba50e7ce
F tool/lemon.c 07aba6270d5a5016ba8107b09e431eea4ecdc123
F tool/lempar.c 01ca97f87610d1dac6d8cd96ab109ab1130e76dc
F tool/logest.c 7ad625cac3d54012b27d468b7af6612f78b9ba75
F tool/logest.c 388c318c7ac8b52b7c08ca1e2de0f4ca9a8f7e81
F tool/mkautoconfamal.sh f8d8dbf7d62f409ebed5134998bf5b51d7266383
F tool/mkkeywordhash.c c9e05e4a7bcab8fab9f583d5b321fb72f565ad97
F tool/mkopts.tcl 66ac10d240cc6e86abd37dc908d50382f84ff46e
@ -1159,7 +1159,7 @@ F tool/vdbe_profile.tcl 67746953071a9f8f2f668b73fe899074e2c6d8c1
F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
F tool/warnings.sh d1a6de74685f360ab718efda6265994b99bbea01
F tool/win/sqlite.vsix 030f3eeaf2cb811a3692ab9c14d021a75ce41fff
P 2b28e8d582cf10936fa1faca04a16ca2eeead66f
R 76c12b0a4284d7654cb2771b2fc9c8eb
U dan
Z 22c3e1f8cdae5a20dae420dc313d8edd
P f585f5d7a0f9bf8c590388654a3638231eba8892
R fc449dde2f7cf3aac00c9e1a5da52aee
U drh
Z ebedee01c152a936b8dfbac0e8a85bc4

2
manifest.uuid
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@ -1 +1 @@
f585f5d7a0f9bf8c590388654a3638231eba8892
b4bd2a062c4baf5f622d61b7411f00de5904ef56

62
tool/logest.c
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@ -17,13 +17,7 @@
**
** ./LogEst ARGS
**
** Arguments:
**
** 'x' Multiple the top two elements of the stack
** '+' Add the top two elements of the stack
** NUM Convert NUM from integer to LogEst and push onto the stack
** ^NUM Interpret NUM as a LogEst and push onto stack.
**
** See the showHelp() routine for a description of valid arguments.
** Examples:
**
** To convert 123 from LogEst to integer:
@ -97,12 +91,31 @@ static LogEst logEstFromDouble(double x){
return e*10;
}
int isInteger(const char *z){
while( z[0]>='0' && z[0]<='9' ) z++;
return z[0]==0;
}
int isFloat(const char *z){
while( z[0] ){
if( z[0]=='.' || z[0]=='E' || z[0]=='e' ) return 1;
z++;
}
return 0;
char c;
while( ((c=z[0])>='0' && c<='9') || c=='.' || c=='E' || c=='e'
|| c=='+' || c=='-' ) z++;
return z[0]==0;
}
static void showHelp(const char *zArgv0){
printf("Usage: %s ARGS...\n", zArgv0);
printf("Arguments:\n"
" NUM Convert NUM from integer to LogEst and push onto the stack\n"
" ^NUM Interpret NUM as a LogEst and push onto stack\n"
" x Multiple the top two elements of the stack\n"
" + Add the top two elements of the stack\n"
" dup Dupliate the top element on the stack\n"
" inv Take the reciprocal of the top of stack. N = 1/N.\n"
" log Find the LogEst of the number on top of stack\n"
" nlogn Compute NlogN where N is the top of stack\n"
);
exit(1);
}
int main(int argc, char **argv){
@ -111,30 +124,43 @@ int main(int argc, char **argv){
LogEst a[100];
for(i=1; i<argc; i++){
const char *z = argv[i];
if( z[0]=='+' ){
if( strcmp(z,"+")==0 ){
if( n>=2 ){
a[n-2] = logEstAdd(a[n-2],a[n-1]);
n--;
}
}else if( z[0]=='x' ){
}else if( strcmp(z,"x")==0 ){
if( n>=2 ){
a[n-2] = logEstMultiply(a[n-2],a[n-1]);
n--;
}
}else if( strcmp(z,"dup")==0 ){
if( n>0 ){
a[n] = a[n-1];
n++;
}
}else if( strcmp(z,"log")==0 ){
if( n>0 ) a[n-1] = logEstFromInteger(a[n-1]) - 33;
}else if( strcmp(z,"nlogn")==0 ){
if( n>0 ) a[n-1] += logEstFromInteger(a[n-1]) - 33;
}else if( strcmp(z,"inv")==0 ){
if( n>0 ) a[n-1] = -a[n-1];
}else if( z[0]=='^' ){
a[n++] = atoi(z+1);
}else if( isFloat(z) ){
}else if( isInteger(z) ){
a[n++] = logEstFromInteger(atoi(z));
}else if( isFloat(z) && z[0]!='-' ){
a[n++] = logEstFromDouble(atof(z));
}else{
a[n++] = logEstFromInteger(atoi(z));
showHelp(argv[0]);
}
}
for(i=n-1; i>=0; i--){
if( a[i]<0 ){
printf("%d (%f)\n", a[i], 1.0/(double)logEstToInt(-a[i]));
printf("%5d (%f)\n", a[i], 1.0/(double)logEstToInt(-a[i]));
}else{
sqlite3_uint64 x = logEstToInt(a[i]+100)*100/1024;
printf("%d (%lld.%02lld)\n", a[i], x/100, x%100);
printf("%5d (%lld.%02lld)\n", a[i], x/100, x%100);
}
}
return 0;