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/* START LIBRARY DESCRIPTION *********************************************
FLOAT.LIB
Copyright (c) 2006, Avtech Electrosystems Ltd.
DESCRIPTION:
Functions that deal with strings and floating point numbers.
SUPPORT LIB'S:
END DESCRIPTION **********************************************************/
#include <string.h>
#include <ctype.h>
#include <math.h>
#include <glib/gprintf.h>
#include "globals.h"
#include "string_utils.h"
void Float_To_Text(int decimal_digits,float number_in, gchar ** text_out)
{
g_assert (*text_out == NULL);
if (fabs(number_in)<1.1*smallest_allowed_number) {
if (number_in<0.0) {
*text_out = g_strdup_printf("-0.%0*d",decimal_digits,0);
} else {
*text_out = g_strdup_printf("0.%0*d",decimal_digits,0);
}
return;
}
*text_out = g_strdup_printf("%.*e", decimal_digits, number_in);
}
int String_trim_excess_digits(char *parameter)
{
/* this function takes a parameter like "1.2345678901234567890" and reduces it to "1.234567" */
/* so that atof() will work properly */
gchar* new_string = g_strdup(parameter);
memset(new_string, 0, strlen(parameter));
int i;
int j;
int sig_digits; /* number of significant digits so far */
long exp_power; /* append an exponent of this power */
int sign; /* is the exponent negative? */
int start_of_exponent; /* location of exponent */
i=0; /* location in input string */
j=0; /* location in output string */
sig_digits=0;
exp_power=0;
sign=NO;
#define max_sig_dig 8
if (!(isdigit(parameter[0]) || parameter[0]=='+' || parameter[0]=='-' || parameter[0]=='.')) {
return OK;
}
/* take care of sign */
if (parameter[0]=='+' || parameter[0]=='-') {
new_string[j]=parameter[i];
++i;
++j;
}
/* leave in leading zeros */
while (parameter[i]=='0') {
new_string[j]=parameter[i];
++i;
++j;
}
/* leave in up to 8 pre-decimal significant digits */
while (isdigit(parameter[i]) && sig_digits<max_sig_dig) {
new_string[j]=parameter[i];
++i;
++j;
++sig_digits;
}
/* if there are remaining digits, truncate and add exponent, and then return immediately */
while (isdigit(parameter[i]) && sig_digits==max_sig_dig) {
++i;
++exp_power;
}
if (exp_power>0) {
strcat(new_string+j,"e");
//replaced itoa (non standard) with sprintf
char temp[64];
memset(temp, 0, 64);
sprintf(temp, "%ld", exp_power);
strcat(new_string,temp);
strcpy(parameter,new_string);
if (exp_power<38) {
return OK;
} else {
return OutOfRange;
}
}
/* leave in decimal point */
if (parameter[i]=='.') {
new_string[j]=parameter[i];
++i;
++j;
}
/* leave in post-decimal zeros if no significant digits yet */
while (parameter[i]=='0' && sig_digits==0) {
new_string[j]=parameter[i];
++i;
++j;
}
/* leave in up to 8 post-decimal significant digits */
while (isdigit(parameter[i]) && sig_digits<max_sig_dig) {
new_string[j]=parameter[i];
++i;
++j;
++sig_digits;
}
/* skip extraneous post-decimal digits */
while (isdigit(parameter[i]) && sig_digits==max_sig_dig) {
++i;
}
if (parameter[i]=='e') {
new_string[j]=parameter[i];
++i;
++j;
if (parameter[i]=='+') {
sign=NO;
new_string[j]=parameter[i];
++i;
++j;
} else if (parameter[i]=='-') {
sign=YES;
new_string[j]=parameter[i];
++i;
++j;
}
if (i<strlen(parameter) && isdigit(parameter[i])) {
start_of_exponent=j;
new_string[j]=parameter[i];
++i;
++j;
}
while (i<strlen(parameter) && isdigit(parameter[i])) {
new_string[j]=parameter[i];
++i;
++j;
}
new_string[j]=0;
exp_power=atol(new_string+start_of_exponent);
if (exp_power>37 && sign==NO) {
g_free(new_string);
return OutOfRange;
}
if (exp_power>37 && sign==YES) {
strcpy(new_string,"0.0");
}
}
new_string[j]=0;
strcpy(parameter,new_string);
g_free(new_string);
return OK;
}
/*----------------------------------------------------------------------------------------------------------*/
int String_is_it_numeric(char *parameter)
{
/* this function takes a parameter like "1e+6" or "on" and determines if it is numeric or not */
/* it is similar to the Parser_get_unit function */
// FIXME - replace in calling code with strtof
gchar *testme = g_strdup (parameter);
g_strstrip (parameter);
char * p;
strtof (testme, &p);
g_free (testme);
return *p == '\0';
}
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