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270 lines
9.4 KiB
270 lines
9.4 KiB
// read_real().
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// This file contains a slimmed down version of read_complex().
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// It does not pull in all the complex function code.
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// General includes.
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#include "cl_sysdep.h"
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// Specification.
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#include "cln/real_io.h"
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// Implementation.
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#include <cstring>
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#include "cln/input.h"
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#include "cln/rational_io.h"
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#include "cln/integer_io.h"
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#include "cln/float_io.h"
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#include "cln/integer.h"
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#include "cl_I.h"
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#include "cl_F.h"
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#include "cln/abort.h"
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#undef floor
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#include <cmath>
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#define floor cln_floor
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namespace cln {
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// Step forward over all digits, to the end of string or to the next non-digit.
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static const char * skip_digits (const char * ptr, const char * string_limit, unsigned int base)
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{
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for ( ; ptr != string_limit; ptr++) {
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var char ch = *ptr;
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if ((ch >= '0') && (ch <= '9'))
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if (ch < '0' + (int)base)
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continue;
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else
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break;
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else {
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if (base <= 10)
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break;
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if (((ch >= 'A') && (ch < 'A'-10+(int)base))
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|| ((ch >= 'a') && (ch < 'a'-10+(int)base))
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)
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continue;
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else
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break;
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}
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}
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return ptr;
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}
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#define at_end_of_parse(ptr) \
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if (end_of_parse) \
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{ *end_of_parse = (ptr); } \
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else \
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{ if ((ptr) != string_limit) { read_number_junk((ptr),string,string_limit); } }
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const cl_R read_real (const cl_read_flags& flags, const char * string, const char * string_limit, const char * * end_of_parse)
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{
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ASSERT((flags.syntax & ~(syntax_real|syntax_maybe_bad)) == 0);
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// If no string_limit is given, it defaults to the end of the string.
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if (!string_limit)
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string_limit = string + ::strlen(string);
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if (flags.syntax & syntax_rational) {
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// Check for rational number syntax.
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var unsigned int rational_base = flags.rational_base;
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var const char * ptr = string;
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if (flags.lsyntax & lsyntax_commonlisp) {
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if (ptr == string_limit) goto not_rational_syntax;
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if (*ptr == '#') {
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// Check for #b, #o, #x, #nR syntax.
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ptr++;
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if (ptr == string_limit) goto not_rational_syntax;
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switch (*ptr) {
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case 'b': case 'B':
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rational_base = 2; break;
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case 'o': case 'O':
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rational_base = 8; break;
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case 'x': case 'X':
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rational_base = 16; break;
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default:
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var const char * base_end_ptr =
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skip_digits(ptr,string_limit,10);
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if (base_end_ptr == ptr) goto not_rational_syntax;
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if (base_end_ptr == string_limit) goto not_rational_syntax;
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if (!((*base_end_ptr == 'r') || (*base_end_ptr == 'R')))
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goto not_rational_syntax;
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var cl_I base = read_integer(10,0,ptr,0,base_end_ptr-ptr);
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if (!((base >= 2) && (base <= 36))) {
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fprint(std::cerr, "Base must be an integer in the range from 2 to 36, not ");
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fprint(std::cerr, base);
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fprint(std::cerr, "\n");
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cl_abort();
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}
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rational_base = FN_to_UV(base); ptr = base_end_ptr;
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break;
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}
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ptr++;
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}
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}
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var const char * ptr_after_prefix = ptr;
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var cl_signean sign = 0;
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if (ptr == string_limit) goto not_rational_syntax;
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switch (*ptr) {
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case '-': sign = ~sign;
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case '+': ptr++;
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default: break;
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}
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var const char * ptr_after_sign = ptr;
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if (flags.syntax & syntax_integer) {
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// Check for integer syntax: {'+'|'-'|} {digit}+ {'.'|}
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// Allow final dot only in Common Lisp syntax if there was no #<base> prefix.
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if ((flags.lsyntax & lsyntax_commonlisp) && (ptr_after_prefix == string)) {
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ptr = skip_digits(ptr_after_sign,string_limit,10);
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if (ptr != ptr_after_sign)
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if (ptr != string_limit)
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if (*ptr == '.') {
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ptr++;
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if ((ptr == string_limit) || !(((*ptr >= '0') && (*ptr <= '9')) || ((*ptr >= 'A') && (*ptr <= 'Z') && (*ptr != 'I')) || ((*ptr >= 'a') && (*ptr <= 'z') && (*ptr != 'i')) || (*ptr == '.') || (*ptr == '_') || (*ptr == '/'))) {
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at_end_of_parse(ptr);
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return read_integer(10,sign,ptr_after_sign,0,ptr-ptr_after_sign);
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}
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}
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}
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ptr = skip_digits(ptr_after_sign,string_limit,rational_base);
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if ((ptr == string_limit) || !(((*ptr >= '0') && (*ptr <= '9')) || ((*ptr >= 'A') && (*ptr <= 'Z') && (*ptr != 'I')) || ((*ptr >= 'a') && (*ptr <= 'z') && (*ptr != 'i')) || (*ptr == '.') || (*ptr == '_') || (*ptr == '/'))) {
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at_end_of_parse(ptr);
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return read_integer(rational_base,sign,ptr_after_sign,0,ptr-ptr_after_sign);
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}
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}
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if (flags.syntax & syntax_ratio) {
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// Check for ratio syntax: {'+'|'-'|} {digit}+ '/' {digit}+
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ptr = skip_digits(ptr_after_sign,string_limit,rational_base);
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if (ptr != ptr_after_sign)
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if (ptr != string_limit)
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if (*ptr == '/') {
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var const char * ptr_at_slash = ptr;
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ptr = skip_digits(ptr_at_slash+1,string_limit,rational_base);
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if (ptr != ptr_at_slash+1)
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if ((ptr == string_limit) || !(((*ptr >= '0') && (*ptr <= '9')) || ((*ptr >= 'A') && (*ptr <= 'Z') && (*ptr != 'I')) || ((*ptr >= 'a') && (*ptr <= 'z') && (*ptr != 'i')) || (*ptr == '.') || (*ptr == '_') || (*ptr == '/'))) {
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at_end_of_parse(ptr);
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return read_rational(rational_base,sign,ptr_after_sign,0,ptr_at_slash-ptr_after_sign,ptr-ptr_after_sign);
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}
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}
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}
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}
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not_rational_syntax:
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if (flags.syntax & syntax_float) {
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// Check for floating-point number syntax:
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// {'+'|'-'|} {digit}+ {'.' {digit}* | } expo {'+'|'-'|} {digit}+
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// {'+'|'-'|} {digit}* '.' {digit}+ expo {'+'|'-'|} {digit}+
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// {'+'|'-'|} {digit}* '.' {digit}+
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var const char * ptr = string;
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var const unsigned int float_base = 10;
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var cl_signean sign = 0;
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if (ptr == string_limit) goto not_float_syntax;
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switch (*ptr) {
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case '-': sign = ~sign;
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case '+': ptr++;
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default: break;
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}
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var const char * ptr_after_sign = ptr;
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var const char * ptr_after_intpart = skip_digits(ptr_after_sign,string_limit,float_base);
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var cl_boolean have_dot = cl_false;
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var const char * ptr_before_fracpart = ptr_after_intpart;
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var const char * ptr_after_fracpart = ptr_after_intpart;
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ptr = ptr_after_intpart;
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if (ptr != string_limit)
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if (*ptr == '.') {
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have_dot = cl_true;
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ptr_before_fracpart = ptr+1;
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ptr_after_fracpart = skip_digits(ptr_before_fracpart,string_limit,float_base);
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}
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ptr = ptr_after_fracpart;
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var char exponent_marker;
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var cl_boolean have_exponent;
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var const char * ptr_in_exponent = ptr;
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var const char * ptr_after_exponent = ptr;
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if ((ptr == string_limit) || !(((*ptr >= '0') && (*ptr <= '9')) || ((*ptr >= 'A') && (*ptr <= 'Z') && (*ptr != 'I')) || ((*ptr >= 'a') && (*ptr <= 'z') && (*ptr != 'i')) || (*ptr == '.') || (*ptr == '/'))) {
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// No exponent.
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have_exponent = cl_false;
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// Must have at least one fractional part digit.
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if (ptr_after_fracpart == ptr_before_fracpart) goto not_float_syntax;
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exponent_marker = 'E';
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} else {
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have_exponent = cl_true;
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// Must have at least one digit.
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if (ptr_after_sign == ptr_after_intpart)
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if (ptr_after_fracpart == ptr_before_fracpart)
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goto not_float_syntax;
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exponent_marker = ((*ptr >= 'a') && (*ptr <= 'z') ? *ptr - 'a' + 'A' : *ptr);
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switch (exponent_marker) {
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case 'E':
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case 'S': case 'F': case 'D': case 'L':
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break;
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default:
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goto not_float_syntax;
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}
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}
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if (have_exponent) {
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ptr++;
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if (ptr == string_limit) goto not_float_syntax;
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switch (*ptr) {
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case '-':
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case '+': ptr++;
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default: break;
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}
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ptr_in_exponent = ptr;
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ptr_after_exponent = skip_digits(ptr_in_exponent,string_limit,10);
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if (ptr_after_exponent == ptr_in_exponent) goto not_float_syntax;
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}
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ptr = ptr_after_exponent;
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var const char * ptr_after_prec = ptr;
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var float_format_t prec;
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if ((ptr != string_limit) && (*ptr == '_')) {
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ptr++;
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ptr_after_prec = skip_digits(ptr,string_limit,10);
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if (ptr_after_prec == ptr) goto not_float_syntax;
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var cl_I prec1 = digits_to_I(ptr,ptr_after_prec-ptr,10);
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var uintL prec2 = cl_I_to_UL(prec1);
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prec = (float_base==10 ? float_format(prec2)
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: (float_format_t)((uintL)((1+prec2)*::log((double)float_base)*1.442695041)+1)
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);
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} else {
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switch (exponent_marker) {
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case 'S': prec = float_format_sfloat; break;
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case 'F': prec = float_format_ffloat; break;
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case 'D': prec = float_format_dfloat; break;
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case 'L': prec = flags.float_flags.default_lfloat_format; break;
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case 'E': prec = flags.float_flags.default_float_format; break;
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default: NOTREACHED
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}
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if (flags.float_flags.mantissa_dependent_float_format) {
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// Count the number of significant digits.
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ptr = ptr_after_sign;
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while (ptr < ptr_after_fracpart && (*ptr == '0' || *ptr == '.')) ptr++;
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var uintL num_significant_digits =
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(ptr_after_fracpart - ptr) - (ptr_before_fracpart > ptr ? 1 : 0);
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var uintL prec2 = (num_significant_digits>=2 ? num_significant_digits-2 : 0);
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var float_format_t precx =
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(float_base==10 ? float_format(prec2)
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: (float_format_t)((uintL)((1+prec2)*::log((double)float_base)*1.442695041)+1)
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);
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if ((uintL)precx > (uintL)prec)
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prec = precx;
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}
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}
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floatformatcase(prec
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, if (!(flags.syntax & syntax_sfloat)) goto not_float_syntax;
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, if (!(flags.syntax & syntax_ffloat)) goto not_float_syntax;
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, if (!(flags.syntax & syntax_dfloat)) goto not_float_syntax;
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, unused len;
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if (!(flags.syntax & syntax_lfloat)) goto not_float_syntax;
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);
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at_end_of_parse(ptr_after_prec);
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return read_float(float_base,prec,sign,ptr_after_sign,0,ptr_after_fracpart-ptr_after_sign,ptr_after_exponent-ptr_after_sign,ptr_before_fracpart-ptr_after_sign);
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}
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not_float_syntax:
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if (flags.syntax & syntax_maybe_bad) {
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ASSERT(end_of_parse);
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*end_of_parse = string;
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return 0; // dummy return
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}
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read_number_bad_syntax(string,string_limit);
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}
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} // namespace cln
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