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#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);
}
gboolean String_is_it_numeric(char *parameter)
{
GRegex *numeric_regex = g_regex_new ( "\\s*[+-]?(\\d*\\.\\d+|\\d+(\\.\\d*)?)\\s*(e\\s*[+-]?\\d+)?\\s*",
G_REGEX_CASELESS,
0,
NULL);
gboolean match = g_regex_match (numeric_regex, parameter, 0, NULL);
g_regex_unref (numeric_regex);
return match;
}
void String_Parameter_To_Text(float Float_To_Convert, int significant_digits,
char *start_string,char *units,gchar **LCD_string,int show_plus_sign)
{
gchar *floating_val = NULL;
gchar *unit_mult = NULL; /* units multiplier, eg. M, k, u */
/* Copy the floating point value to a string. Do not multiply to accomodate units; the roundoff */
/* is annoying. (e.g. 1.000 -> 0.999) */
/* Move the decimal with string manipulations instead. */
GString *out_gstr = g_string_new (start_string);
/* if significant_digits is zero, used the supplied integer rather than the floating number */
if (!significant_digits) {
g_string_append_printf (out_gstr, "%d", (int) Float_To_Convert);
} else {
int i;
int shift_decimal_by; /* if the exponent isn't a multiple of 3, the decimal point will be moved */
int decimal_location; /* where the decimal is in the number string */
int exponent_val; /* the exponent, in integer form */
Float_To_Text(remote_digits_after_decimal,Float_To_Convert,&floating_val);
/* -- COPY FIRST ONE OR TWO CHARACTERS -- */
if (floating_val[0]=='-') { /* if it's negative ... */
decimal_location=2; /* decimal at position two (e.g.: -2.23e-9) */
out_gstr = g_string_append_c (out_gstr, '-'); /* copy minus sign */
out_gstr = g_string_append_c (out_gstr, floating_val[1]); /* copy first digit */
} else if (show_plus_sign==YES) { /* if it's positive and plus sign required ... */
decimal_location=1; /* decimal at position one (e.g.: 2.23e-9) */
out_gstr = g_string_append_c (out_gstr, '+'); /* copy minus sign */
out_gstr = g_string_append_c (out_gstr, floating_val[0]); /* copy first digit */
} else { /* if it's positive and plus sign not required ... */
decimal_location=1; /* decimal at position one (e.g.: 2.23e-9) */
out_gstr = g_string_append_c (out_gstr, floating_val[0]); /* copy first digit */
}
int digits_so_far = 1;
/* -- FIND EXPONENT -- */
/* find how much the decimal has to be moved, by examining the exponent in the string and */
/* modding it by 3 */
exponent_val = atoi(floating_val+strlen(floating_val)-3); /* read the last three characters */
/* e.g. +09, or -07 */
shift_decimal_by=(300+exponent_val) % 3; /* added 300 to keep everything positive */
/* -- PICK UNITS -- */
if (exponent_val<12 && exponent_val>=9) {
unit_mult = g_strdup("G");
} else if (exponent_val<9 && exponent_val>=6) {
unit_mult = g_strdup("M");
} else if (exponent_val<6 && exponent_val>=3) {
unit_mult = g_strdup("k");
} else if (exponent_val<3 && exponent_val>=0) {
unit_mult = g_strdup("");
} else if (exponent_val<0 && exponent_val>=-3) {
unit_mult = g_strdup("m");
} else if (exponent_val<-3 && exponent_val>=-6) {
unit_mult = g_strdup("u");
} else if (exponent_val<-6 && exponent_val>=-9) {
unit_mult = g_strdup("n");
} else if (exponent_val<-9 && exponent_val>=-12) {
unit_mult = g_strdup("p");
} else {
unit_mult = g_strdup(""); /* if parameter=0, don't use silly units */
}
/* -- MOVE DIGITS AROUND DECIMAL POINT -- */
/* move the digits that will come before the decimal */
for (i=decimal_location; i<decimal_location+shift_decimal_by; ++i) {
out_gstr = g_string_append_c (out_gstr, floating_val[1+i]);
++digits_so_far;
}
/* put in the new decimal point */
out_gstr = g_string_append_c (out_gstr, '.');
/* copy the rest of the digits */
for (i=shift_decimal_by+1+decimal_location; digits_so_far<significant_digits; ++i) {
out_gstr = g_string_append_c (out_gstr, floating_val[i]);
++digits_so_far;
/* leave space for minus sign, decimal point, and extra digit on the end too */
}
/* -- FINISH UP -- */
/* -- CHECK FOR TERMINATING DECIMAL POINT -- */
int len = strlen(out_gstr->str);
if (out_gstr->str[len-1]=='.') {
out_gstr = g_string_erase (out_gstr, len-1, 1);
}
out_gstr = g_string_append (out_gstr, unit_mult);
}
out_gstr = g_string_append (out_gstr, units);
*LCD_string = g_strdup (out_gstr->str);
g_string_free (out_gstr, TRUE);
g_free (floating_val);
g_free (unit_mult);
}
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