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Merge pull request #55 from DualBrain/master
Fix incorrect exponent (off by 1) for "large" values when converting …
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commit
f785c79164
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@ -6948,9 +6948,58 @@ qbs *qbs_str(float value){
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qbs *qbs_str(double value){
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static qbs *tqbs;
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tqbs=qbs_new(32,1);
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static char ch;
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static int32 l,i,i2,i3,digits,exponent;
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static int32 mult,exp,index;
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l=sprintf((char*)&qbs_str_buffer,"% .15E",value);
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// the "new version"...
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// scan the result (in reverse) to determine the exponent.
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exponent = 0; mult = 1;
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for (i = l; i > 0; i--) {
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if (!(qbs_str_buffer[i] == 0 || qbs_str_buffer[i] == 32)) { // not null or space...
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if (qbs_str_buffer[i] == 43) {
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break; // if a +, exit for.
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} else if (qbs_str_buffer[i] == 45) {
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exponent = -exponent;
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break; // a -, negate exponent and exit for.
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} else {
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exponent += (qbs_str_buffer[i] - 48) * mult;
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mult *= 10;
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}
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}
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}
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digits = 0; exp = 0;
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for (i = l; i > 0; i--) {
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if (exp == 0) {
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if (qbs_str_buffer[i] == 69) { exp = i; } // location of the E
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} else if (qbs_str_buffer[i] != 48 && qbs_str_buffer[i] != 46) {
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digits = i; break;
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}
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}
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if (digits==0){
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tqbs->len=2; tqbs->chr[0]=32; tqbs->chr[1]=48; // tqbs=[space][0]
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return tqbs;
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}
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if (exponent >= 16 || exponent <= -17) {
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index=0;
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for (i = 0; i < digits + 1; i++) {
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ch = qbs_str_buffer[i];
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tqbs->chr[index++] = ch;
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}
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tqbs->chr[index++] = 68;
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for (i = exp + 1; i < l; i++) {
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ch = qbs_str_buffer[i];
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tqbs->chr[index++] = ch;
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}
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tqbs->len=index;
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return tqbs;
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}
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/* ----- the "old way"; which has problems with formatting certain exponents properly.
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//IMPORTANT: assumed l==23
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if (l==22){memmove(&qbs_str_buffer[21],&qbs_str_buffer[20],2); qbs_str_buffer[20]=48; l=23;}
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@ -6979,6 +7028,7 @@ qbs *qbs_str(double value){
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if (qbs_str_buffer[19]==45) exponent=-exponent;
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//OLD if ((exponent<=15)&&((exponent-digits)>=-16)) goto asdecimal;
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if ((exponent<=15)&&((exponent-digits)>=-17)) goto asdecimal;
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//fix up exponent to conform to QBASIC standards
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//i. cull trailing 0's after decimal point (use digits to help)
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//ii. cull leading 0's of exponent
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@ -6997,6 +7047,8 @@ qbs *qbs_str(double value){
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return tqbs;
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/////////////////////
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asdecimal:
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*/
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//calculate digits after decimal point in var. i
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i=-(exponent-digits+1);
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if (i<0) i=0;
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