1 | /**************************************** |
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2 | * Computer Algebra System SINGULAR * |
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3 | ****************************************/ |
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4 | /* |
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5 | * ABSTRACT - |
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6 | * IO for long rational numbers (Hubert Grassmann) |
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7 | */ |
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8 | |
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9 | #include <stdio.h> |
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10 | #include <string.h> |
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11 | |
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12 | #include "config.h" |
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13 | #include <misc/auxiliary.h> |
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14 | |
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15 | #include <omalloc/omalloc.h> |
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16 | #include <reporter/reporter.h> |
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17 | |
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18 | #include "coeffs.h" |
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19 | #include "numbers.h" |
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20 | |
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21 | #include "longrat.h" |
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22 | |
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23 | /// Our Type! |
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24 | static const n_coeffType ID = n_Q; |
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25 | |
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26 | //#ifndef SI_THREADS |
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27 | omBin rnumber_bin = omGetSpecBin(sizeof(snumber)); // TODO: move this into coeffs-struct (for Q)?! |
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28 | //#endif |
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29 | |
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30 | |
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31 | #define SR_HDL(A) ((long)(A)) |
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32 | //#define SR_INT 1 // already in longrat.h |
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33 | //#define INT_TO_SR(INT) ((number) (((long)INT << 2) + SR_INT)) |
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34 | #define SR_TO_INT(SR) (((long)SR) >> 2) |
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35 | |
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36 | |
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37 | /*2 |
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38 | * extracts a long integer from s, returns the rest |
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39 | */ |
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40 | static const char * nlEatLong(char *s, mpz_ptr i) |
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41 | { |
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42 | const char * start=s; |
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43 | |
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44 | while (*s >= '0' && *s <= '9') s++; |
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45 | if (*s=='\0') |
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46 | { |
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47 | mpz_set_str(i,start,10); |
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48 | } |
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49 | else |
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50 | { |
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51 | char c=*s; |
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52 | *s='\0'; |
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53 | mpz_set_str(i,start,10); |
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54 | *s=c; |
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55 | } |
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56 | return s; |
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57 | } |
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58 | |
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59 | /*2 |
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60 | * extracts the number a from s, returns the rest |
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61 | */ |
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62 | const char * nlRead (const char *s, number *a, const coeffs r) |
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63 | { |
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64 | if (*s<'0' || *s>'9') |
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65 | { |
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66 | *a = INT_TO_SR(1); /* nlInit(1) */ |
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67 | return s; |
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68 | } |
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69 | *a=(number)ALLOC_RNUMBER(); |
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70 | { |
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71 | (*a)->s = 3; |
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72 | #if defined(LDEBUG) |
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73 | (*a)->debug=123456; |
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74 | #endif |
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75 | mpz_ptr z=(*a)->z; |
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76 | mpz_ptr n=(*a)->n; |
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77 | mpz_init(z); |
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78 | s = nlEatLong((char *)s, z); |
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79 | if (*s == '/') |
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80 | { |
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81 | mpz_init(n); |
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82 | (*a)->s = 0; |
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83 | s++; |
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84 | s = nlEatLong((char *)s, n); |
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85 | if (mpz_cmp_si(n,(long)0)==0) |
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86 | { |
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87 | WerrorS(nDivBy0); |
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88 | mpz_clear(n); |
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89 | (*a)->s = 3; |
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90 | } |
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91 | else if (mpz_cmp_si(n,(long)1)==0) |
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92 | { |
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93 | mpz_clear(n); |
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94 | (*a)->s=3; |
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95 | } |
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96 | } |
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97 | if (mpz_cmp_si(z,(long)0)==0) |
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98 | { |
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99 | mpz_clear(z); |
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100 | FREE_RNUMBER(*a); |
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101 | *a=INT_TO_SR(0); |
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102 | } |
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103 | else |
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104 | if ((*a)->s==3) |
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105 | { |
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106 | number nlShort3_noinline(number x); |
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107 | *a=nlShort3_noinline(*a); |
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108 | } |
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109 | else |
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110 | { |
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111 | number aa=*a; |
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112 | nlNormalize(aa,r); |
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113 | *a=aa; |
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114 | } |
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115 | } |
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116 | return s; |
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117 | } |
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118 | |
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119 | /*2 |
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120 | * write a rational number |
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121 | */ |
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122 | void nlWrite (number &a, const coeffs r) |
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123 | { |
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124 | char *s,*z; |
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125 | if (SR_HDL(a) & SR_INT) |
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126 | { |
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127 | StringAppend("%ld",SR_TO_INT(a)); |
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128 | } |
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129 | else if (a==NULL) |
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130 | { |
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131 | StringAppendS("o"); |
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132 | } |
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133 | else |
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134 | { |
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135 | if (a->s==0) |
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136 | { |
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137 | nlNormalize(a,r); |
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138 | nlWrite(a,r); |
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139 | return; |
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140 | } |
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141 | int l=mpz_sizeinbase(a->z,10); |
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142 | if (a->s<2) l=si_max(l,(int)mpz_sizeinbase(a->n,10)); |
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143 | l+=2; |
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144 | s=(char*)omAlloc(l); |
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145 | z=mpz_get_str(s,10,a->z); |
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146 | StringAppendS(z); |
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147 | if (a->s!=3) |
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148 | { |
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149 | StringAppendS("/"); |
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150 | z=mpz_get_str(s,10,a->n); |
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151 | StringAppendS(z); |
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152 | } |
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153 | omFreeSize((void *)s,l); |
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154 | } |
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155 | } |
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156 | |
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157 | |
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