Subversion Repositories wimsdev

/*

*********************************************************************************

* J.M. Evers 3/2012                                                             *

* This is all amateur scriblings... So no copyrights.                           *

* This source code file, and compiled objects derived from it,                  *

* can be used and distributed without restriction, including for commercial use *

* No warrenty whatsoever                                                        *

*********************************************************************************

18/10/2012 :

Added Mathml output

Added option significance=-1

To be used when there is no significance known ; just tries to print the number in science notation

Using the original amount of digits used in "number" argument

!exec scienceprint 123.445000e+23,-1 --> 1.23445000*10^25

*********************************************************************************

WIMS usage:

sci_num = !exec scienceprint number,significance,type

number: a number

significance : desired precision

type (optional args): calc = 0 / html = 1 / latex = 2  / prefix = 3  / mathml = 4

default  : calc   notation : 120000,3   -> 1.20*10^5

type = 0 : calc   notation : 120000,3,0 -> 1.20*10^5

type = 1 : html notation   : 120000,3,1 -> 1.20&times;10<sup>5</sup>

type = 2 : latex notation  : 120000,3,2 -> 1.20 \times 10^{5}

type = 3 : prefix-notation : 120000,3,3 -> 120.0 k

type = 3 : if -24 > prefix > 24         -> type = 1 (html)

type = 4 : mathml notation

multiple conversion: use space between arguments

scienceprint 120000,4 122900,5 120036,6,3 --> 120.0*10^3,122.90*10^3,120.036 k

24  yotta       Y

21  zetta       Z

18  exa         E

15  peta        P

12  tera        T

9   giga        G

6   mega        M

3   kilo        k

2   hecto       h

1   deca        da

-1  deci        d

-2  centi       c

-3  milli       m

-6  micro       µ

-9  nano        n

-12 pico        p

-15 femto       f

-18 atto        a

-21 zepto       z

-24 yocto       y

*/

#include <stdio.h>

#include <math.h>

#include <string.h>

#include <stdlib.h>

#define MICRO "µ"

#define PREFIX_START (-24)

#define PREFIX_END 24

#define MAX_CONV 256

char *printscience(double value, int sig, int format , int cnt ,int size){

    static char *prefix[] = { "y", "z", "a", "f", "p", "n", MICRO, "m", "", "k", "M", "G", "T", "P", "E", "Z", "Y" };

    double display, fract;

    char *sign = NULL;

    int exponent10;

    if( sig == -1 ){

     /* no significance truncations...just science notation 1234 -> 1.234*10^3  ; try (!) to use same amount of digits*/

        sig = size;

        if(format == 3){format = 1;} /* no prefix --> html noation */

        if(value < 0.0) {sign = "-";value = -value;sig--;} else {sign = "";}

        exponent10=0;

        if(value>=1){

            while(value > 10){

                value=value / 10.0;

                exponent10++;

                /* need to set a limit to number of while loops ! */

                if(exponent10 > 100){fprintf(stdout,"error : number too big (exponent > 100)\n");return 0;}

            }

        }

        else /* 0 < value < 1 --> exponent10 < 0 */

        {

            while(value < 1){

                value=value*10;

                exponent10--;

                /* need to set a limit to number of while loops ! */

                if(exponent10 <-100){fprintf(stdout,"error : number too small (exponent < -100)\n");return 0;}

            }

        }

    }

    else

    {

        if(value < 0.0) {sign = "-";value = -value;} else {sign = "";}

        exponent10 = lrint( floor( log10(value) ) );/* correctly round to desired precision */

        value *= pow(10.0, sig - 1 - exponent10);

        fract = modf(value, &display);

        if(fract >= 0.5){display += 1.0;}

        value = display * pow(10.0, exponent10 - sig + 1);

        if(exponent10 > 0){exponent10 = (exponent10/3)*3;}else{exponent10 = ((-exponent10+3)/3)*(-3);}

        value *= pow(10.0, -exponent10);

        if(format != 3){ /* allow all powers; not limited by prefix list */

            if(value > 10.0){

                while(value >= 10){

                    value = value / 10.0;

                    exponent10++;

                    /* need to set a limit to number of while loops ! */

                    if(exponent10 > 100){fprintf(stdout,"error : number too big (exponent > 100)\n");return 0;}

                }

            }

        }

        else /* steps of powers dividable by 3 used for prefix notation */

        {

            if (value >= 1000.0) {

                value = value / 1000.0;

                exponent10 = exponent10 + 3;

            }

            else

            {

                if(value >= 100.0){

                    sig =  sig - 2;

                }

                else

                {

                    if(value >= 10.0){

                        sig = sig - 1;

                    }

                }

            }

        }

    }

    if(cnt > 1){fprintf(stdout,",");}

    /* check on format style versus exponent */

    if(exponent10 == 0 ){

        format = 3; /* do not use 1.23*10^0 */

    }

    else

    {

        if(exponent10 == 1){

            format = 3;/* do not use 1.23*10^1 */

            value = value * 10;

            sig = sig - 1;

        }

        else

        {

            if(format == 3 && ((exponent10 < PREFIX_START) || (exponent10 > PREFIX_END))){

                format = 1; /* if no prefix available, revert to html presentation */

            }

        }

    }

    if(sig < 1){sig = 1;}

    if(format != 3 ){

        if( format == 0){ /* 'calculable' presentation */

            fprintf(stdout, "%s%.*f*10^%d", sign, sig-1, value, exponent10);

        }

        else

        {

            if( format == 1 ){ /* html presentation */

                fprintf(stdout, "%s%.*f&times;10<sup>%d</sup>", sign, sig-1, value, exponent10);

            }

            else

            {

                if(format == 2 ){/* latex presentation */

                    fprintf(stdout, "%s%.*f \\times 10^{%d}", sign, sig-1, value, exponent10);

                }

                else

                { /* mathml presentation */

                    fprintf(stdout,"<math xmlns=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><mstyle id=\"wims_mathml\" mathsize=\"110%%\"><mn>%s%.*f</mn><mo>&times;</mo><msup><mn>10</mn><mn>%d</mn></msup></mstyle></math>", sign, sig-1, value, exponent10);

                }

            }

        }

    }

    else /* format = 3 : prefix presentation or other more suitable presentation */

    {

        fprintf(stdout, "%s%.*f %s", sign, sig-1, value,prefix[(exponent10-PREFIX_START)/3]);

    }

    return NULL;

}

int main( int argc , char *argv[]){

    if( argc < 2){

        fprintf(stdout,"syntax error : number1,significance1,type1 number2,significance2,type2 ... number_n,significance_n,type_n \n");

        return 0;

    }

    double number = 0;

    int significance = 0,type = 0,idx = 0,cnt = 1,size = 0;

    char *input = "\0",*ptr = "\0";

    /* test for illegal characters */

    const char *invalid_characters = "\n\"\'!=ABCDFGHIJKLMNOPQRSTUVWXYZabcdfghijklmnopqrstuvwxyz@#$%^*&()[]{};:~><?/\\|";

    /* Ee +- are allowed : 12.34e+05  12.34e-08 */

    /* walk through argument 1 to end, and call function scienceprint(a,b,c) */

    input = argv[cnt];

    while( input != NULL ){

        if(cnt > MAX_CONV){fprintf(stdout,"\nerror: number of conversions exceeds limit of %d\n",MAX_CONV);return 0;}

        while (*input){ /* loop through invalid chars. */

            if ( strchr(invalid_characters, *input) ){

                fprintf(stdout,"\nerror : illegal character \"%s\" \n",input);

                return 0;

            }

            input++;

        }

        /* reset input to actual value */

        input = argv[cnt];

        ptr = (char *) strtok(input,",");

        idx = 0;

        type = 0;

        size = 0;

        while( ptr != NULL ){

            switch( idx ){

                case 0: number = atof(ptr);

                        /* size only interesting when 'significance=-1'

                         determine number of digits : 1.23445e+23 -> size = 6

                        */

                        size = strlen(ptr);if( strstr(ptr,".") != NULL){ size = size - 1 ;}

                        if( strstr(ptr,"E") != NULL){size = size - strlen(strstr(ptr,"E"));}

                        if( strstr(ptr,"e") != NULL){size = size - strlen(strstr(ptr,"e"));}

                        break;

                case 1: significance = atoi(ptr);  break;

                case 2: type = atoi(ptr); if(type < 0 || type > 4 ){type = 0;} break;

                default: break;

            }

            idx++;

            ptr = (char *) strtok(NULL,",");

        }

        /* number and precision are mandatory:  default type=0  */

        if( idx < 2 || idx > 3){fprintf(stdout,"\nsyntax error : number1,significance1,type1 number2,significance2,type2 ... number_n,significance_n,type_n \n");return 0;}

        /* call conversion routine */

        printscience(number, significance, type , cnt , size);

        cnt++;

        input = argv[cnt];

    }

    fprintf(stdout,"\n");

    return 0;

}