2 // This file contains a slimmed down version of read_complex().
3 // It does not pull in all the complex function code.
9 #include "cln/real_io.h"
15 #include "cln/input.h"
16 #include "cln/rational_io.h"
17 #include "cln/integer_io.h"
18 #include "cln/float_io.h"
19 #include "cln/integer.h"
22 #include "cln/abort.h"
26 #define floor cln_floor
30 // Step forward over all digits, to the end of string or to the next non-digit.
31 static const char * skip_digits (const char * ptr, const char * string_limit, unsigned int base)
33 for ( ; ptr != string_limit; ptr++) {
35 if ((ch >= '0') && (ch <= '9'))
36 if (ch < '0' + (int)base)
43 if (((ch >= 'A') && (ch < 'A'-10+(int)base))
44 || ((ch >= 'a') && (ch < 'a'-10+(int)base))
54 #define at_end_of_parse(ptr) \
56 { *end_of_parse = (ptr); } \
58 { if ((ptr) != string_limit) { read_number_junk((ptr),string,string_limit); } }
60 const cl_R read_real (const cl_read_flags& flags, const char * string, const char * string_limit, const char * * end_of_parse)
62 ASSERT((flags.syntax & ~(syntax_real|syntax_maybe_bad)) == 0);
63 // If no string_limit is given, it defaults to the end of the string.
65 string_limit = string + ::strlen(string);
66 if (flags.syntax & syntax_rational) {
67 // Check for rational number syntax.
68 var unsigned int rational_base = flags.rational_base;
69 var const char * ptr = string;
70 if (flags.lsyntax & lsyntax_commonlisp) {
71 if (ptr == string_limit) goto not_rational_syntax;
73 // Check for #b, #o, #x, #nR syntax.
75 if (ptr == string_limit) goto not_rational_syntax;
78 rational_base = 2; break;
80 rational_base = 8; break;
82 rational_base = 16; break;
84 var const char * base_end_ptr =
85 skip_digits(ptr,string_limit,10);
86 if (base_end_ptr == ptr) goto not_rational_syntax;
87 if (base_end_ptr == string_limit) goto not_rational_syntax;
88 if (!((*base_end_ptr == 'r') || (*base_end_ptr == 'R')))
89 goto not_rational_syntax;
90 var cl_I base = read_integer(10,0,ptr,0,base_end_ptr-ptr);
91 if (!((base >= 2) && (base <= 36))) {
92 fprint(stderr, "Base must be an integer in the range from 2 to 36, not ");
97 rational_base = FN_to_UL(base); ptr = base_end_ptr;
103 var const char * ptr_after_prefix = ptr;
104 var cl_signean sign = 0;
105 if (ptr == string_limit) goto not_rational_syntax;
107 case '-': sign = ~sign;
111 var const char * ptr_after_sign = ptr;
112 if (flags.syntax & syntax_integer) {
113 // Check for integer syntax: {'+'|'-'|} {digit}+ {'.'|}
114 // Allow final dot only in Common Lisp syntax if there was no #<base> prefix.
115 if ((flags.lsyntax & lsyntax_commonlisp) && (ptr_after_prefix == string)) {
116 ptr = skip_digits(ptr_after_sign,string_limit,10);
117 if (ptr != ptr_after_sign)
118 if (ptr != string_limit)
121 if ((ptr == string_limit) || !(((*ptr >= '0') && (*ptr <= '9')) || ((*ptr >= 'A') && (*ptr <= 'Z') && (*ptr != 'I')) || ((*ptr >= 'a') && (*ptr <= 'z') && (*ptr != 'i')) || (*ptr == '.') || (*ptr == '_') || (*ptr == '/'))) {
122 at_end_of_parse(ptr);
123 return read_integer(10,sign,ptr_after_sign,0,ptr-ptr_after_sign);
127 ptr = skip_digits(ptr_after_sign,string_limit,rational_base);
128 if ((ptr == string_limit) || !(((*ptr >= '0') && (*ptr <= '9')) || ((*ptr >= 'A') && (*ptr <= 'Z') && (*ptr != 'I')) || ((*ptr >= 'a') && (*ptr <= 'z') && (*ptr != 'i')) || (*ptr == '.') || (*ptr == '_') || (*ptr == '/'))) {
129 at_end_of_parse(ptr);
130 return read_integer(rational_base,sign,ptr_after_sign,0,ptr-ptr_after_sign);
133 if (flags.syntax & syntax_ratio) {
134 // Check for ratio syntax: {'+'|'-'|} {digit}+ '/' {digit}+
135 ptr = skip_digits(ptr_after_sign,string_limit,rational_base);
136 if (ptr != ptr_after_sign)
137 if (ptr != string_limit)
139 var const char * ptr_at_slash = ptr;
140 ptr = skip_digits(ptr_at_slash+1,string_limit,rational_base);
141 if (ptr != ptr_at_slash+1)
142 if ((ptr == string_limit) || !(((*ptr >= '0') && (*ptr <= '9')) || ((*ptr >= 'A') && (*ptr <= 'Z') && (*ptr != 'I')) || ((*ptr >= 'a') && (*ptr <= 'z') && (*ptr != 'i')) || (*ptr == '.') || (*ptr == '_') || (*ptr == '/'))) {
143 at_end_of_parse(ptr);
144 return read_rational(rational_base,sign,ptr_after_sign,0,ptr_at_slash-ptr_after_sign,ptr-ptr_after_sign);
150 if (flags.syntax & syntax_float) {
151 // Check for floating-point number syntax:
152 // {'+'|'-'|} {digit}+ {'.' {digit}* | } expo {'+'|'-'|} {digit}+
153 // {'+'|'-'|} {digit}* '.' {digit}+ expo {'+'|'-'|} {digit}+
154 // {'+'|'-'|} {digit}* '.' {digit}+
155 var const char * ptr = string;
156 var const unsigned int float_base = 10;
157 var cl_signean sign = 0;
158 if (ptr == string_limit) goto not_float_syntax;
160 case '-': sign = ~sign;
164 var const char * ptr_after_sign = ptr;
165 var const char * ptr_after_intpart = skip_digits(ptr_after_sign,string_limit,float_base);
166 var cl_boolean have_dot = cl_false;
167 var const char * ptr_before_fracpart = ptr_after_intpart;
168 var const char * ptr_after_fracpart = ptr_after_intpart;
169 ptr = ptr_after_intpart;
170 if (ptr != string_limit)
173 ptr_before_fracpart = ptr+1;
174 ptr_after_fracpart = skip_digits(ptr_before_fracpart,string_limit,float_base);
176 ptr = ptr_after_fracpart;
177 var char exponent_marker;
178 var cl_boolean have_exponent;
179 var const char * ptr_in_exponent = ptr;
180 var const char * ptr_after_exponent = ptr;
181 if ((ptr == string_limit) || !(((*ptr >= '0') && (*ptr <= '9')) || ((*ptr >= 'A') && (*ptr <= 'Z') && (*ptr != 'I')) || ((*ptr >= 'a') && (*ptr <= 'z') && (*ptr != 'i')) || (*ptr == '.') || (*ptr == '/'))) {
183 have_exponent = cl_false;
184 // Must have at least one fractional part digit.
185 if (ptr_after_fracpart == ptr_before_fracpart) goto not_float_syntax;
186 exponent_marker = 'E';
188 have_exponent = cl_true;
189 // Must have at least one digit.
190 if (ptr_after_sign == ptr_after_intpart)
191 if (ptr_after_fracpart == ptr_before_fracpart)
192 goto not_float_syntax;
193 exponent_marker = ((*ptr >= 'a') && (*ptr <= 'z') ? *ptr - 'a' + 'A' : *ptr);
194 switch (exponent_marker) {
196 case 'S': case 'F': case 'D': case 'L':
199 goto not_float_syntax;
204 if (ptr == string_limit) goto not_float_syntax;
210 ptr_in_exponent = ptr;
211 ptr_after_exponent = skip_digits(ptr_in_exponent,string_limit,10);
212 if (ptr_after_exponent == ptr_in_exponent) goto not_float_syntax;
214 ptr = ptr_after_exponent;
215 var const char * ptr_after_prec = ptr;
216 var float_format_t prec;
217 if ((ptr != string_limit) && (*ptr == '_')) {
219 ptr_after_prec = skip_digits(ptr,string_limit,10);
220 if (ptr_after_prec == ptr) goto not_float_syntax;
221 var cl_I prec1 = digits_to_I(ptr,ptr_after_prec-ptr,10);
222 var uintL prec2 = cl_I_to_UL(prec1);
223 prec = (float_base==10 ? float_format(prec2)
224 : (float_format_t)((uintL)((1+prec2)*::log((double)float_base)*1.442695041)+1)
227 switch (exponent_marker) {
228 case 'S': prec = float_format_sfloat; break;
229 case 'F': prec = float_format_ffloat; break;
230 case 'D': prec = float_format_dfloat; break;
231 case 'L': prec = flags.float_flags.default_lfloat_format; break;
232 case 'E': prec = flags.float_flags.default_float_format; break;
235 if (flags.float_flags.mantissa_dependent_float_format) {
236 // Count the number of significant digits.
237 ptr = ptr_after_sign;
238 while (ptr < ptr_after_fracpart && (*ptr == '0' || *ptr == '.')) ptr++;
239 var uintL num_significant_digits =
240 (ptr_after_fracpart - ptr) - (ptr_before_fracpart > ptr ? 1 : 0);
241 var uintL prec2 = (num_significant_digits>=2 ? num_significant_digits-2 : 0);
242 var float_format_t precx =
243 (float_base==10 ? float_format(prec2)
244 : (float_format_t)((uintL)((1+prec2)*::log((double)float_base)*1.442695041)+1)
246 if ((uintL)precx > (uintL)prec)
251 , if (!(flags.syntax & syntax_sfloat)) goto not_float_syntax;
252 , if (!(flags.syntax & syntax_ffloat)) goto not_float_syntax;
253 , if (!(flags.syntax & syntax_dfloat)) goto not_float_syntax;
255 if (!(flags.syntax & syntax_lfloat)) goto not_float_syntax;
257 at_end_of_parse(ptr_after_prec);
258 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);
262 if (flags.syntax & syntax_maybe_bad) {
263 ASSERT(end_of_parse);
264 *end_of_parse = string;
265 return 0; // dummy return
267 read_number_bad_syntax(string,string_limit);