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1 | /* |
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2 | * File: sstring.c |
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3 | * Author: olaf |
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4 | * |
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5 | * Created on 17. Juni 2010, 13:27 |
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6 | */ |
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7 | |
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8 | #include <stdlib.h> |
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9 | #include <string.h> |
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10 | #include <stdarg.h> |
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11 | |
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12 | #include "string.h" |
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13 | |
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14 | sstr_t sstr(char *s) { |
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15 | sstr_t string; |
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16 | string.ptr = s; |
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17 | string.length = strlen(s); |
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18 | return string; |
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19 | } |
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20 | |
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21 | sstr_t sstrn(char *s, size_t n) { |
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22 | sstr_t string; |
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23 | string.ptr = s; |
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24 | string.length = n; |
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25 | return string; |
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26 | } |
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27 | |
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28 | size_t sstrnlen(size_t n, sstr_t s, ...) { |
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29 | va_list ap; |
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30 | size_t size = s.length; |
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31 | va_start(ap, s); |
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32 | |
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33 | for (int i=0;i<n-1;i++) { |
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34 | sstr_t str = va_arg(ap, sstr_t); |
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35 | size += str.length; |
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36 | } |
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37 | va_end(ap); |
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38 | |
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39 | return size; |
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40 | } |
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41 | |
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42 | sstr_t sstrcat(sstr_t s, ...) { |
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43 | va_list ap; |
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44 | va_start(ap, s); |
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45 | s.ptr[0] = 0; |
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46 | |
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47 | sstr_t str = va_arg (ap, sstr_t); |
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48 | while (str.ptr != NULL) { |
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49 | s.ptr = strncat (s.ptr, str.ptr, s.length); |
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50 | str = va_arg (ap, sstr_t); |
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51 | } |
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52 | va_end(ap); |
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53 | |
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54 | return s; |
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55 | } |
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56 | |
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57 | sstr_t sstrncat(size_t n, sstr_t s, sstr_t c1, ...) { |
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58 | va_list ap; |
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59 | va_start(ap, c1); |
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60 | s.ptr[0] = 0; |
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61 | |
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62 | size_t len = s.length; |
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63 | size_t cplen = c1.length > len ? len : c1.length; |
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64 | char *ptr = s.ptr; |
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65 | |
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66 | memcpy(ptr, c1.ptr, cplen); |
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67 | len -= cplen; |
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68 | ptr += cplen; |
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69 | for (int i=0;i<n-1;i++) { |
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70 | sstr_t str = va_arg (ap, sstr_t); |
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71 | cplen = str.length > len ? len : str.length; |
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72 | if(cplen <= 0) { |
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73 | va_end(ap); |
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74 | return s; |
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75 | } |
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76 | memcpy(ptr, str.ptr, cplen); |
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77 | len -= cplen; |
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78 | ptr += cplen; |
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79 | } |
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80 | va_end(ap); |
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81 | |
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82 | return s; |
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83 | } |
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84 | |
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85 | sstr_t sstrsubs(sstr_t s, size_t start) { |
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86 | return sstrsubsl (s, start, s.length-start); |
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87 | } |
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88 | |
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89 | sstr_t sstrsubsl(sstr_t s, size_t start, size_t length) { |
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90 | sstr_t new_sstr; |
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91 | if (start < 0 || start >= s.length || length < 0) { |
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92 | return s; |
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93 | } |
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94 | if (length > s.length-start) { |
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95 | length = s.length-start; |
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96 | } |
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97 | new_sstr.ptr = &s.ptr[start]; |
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98 | new_sstr.length = length; |
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99 | return new_sstr; |
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100 | } |
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101 | |
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102 | sstr_t* sstrsplit(sstr_t s, sstr_t d, size_t *n) { |
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103 | if (d.length == 0) { |
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104 | return NULL; |
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105 | } |
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106 | |
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107 | sstr_t* result; |
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108 | size_t nmax = *n; |
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109 | *n = 1; |
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110 | |
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111 | /* special case: exact match - no processing needed */ |
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112 | if (s.length == d.length && strncmp(s.ptr, d.ptr, s.length) == 0) { |
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113 | *n = 0; |
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114 | return NULL; |
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115 | } |
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116 | sstr_t sv = sstrdup(s); |
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117 | |
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118 | for (int i = 0 ; i < s.length ; i++) { |
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119 | if (sv.ptr[i] == d.ptr[0]) { |
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120 | _Bool match = 1; |
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121 | for (int j = 1 ; j < d.length ; j++) { |
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122 | if (j+i < s.length) { |
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123 | match &= (sv.ptr[i+j] == d.ptr[j]); |
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124 | } else { |
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125 | match = 0; |
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126 | break; |
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127 | } |
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128 | } |
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129 | if (match) { |
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130 | (*n)++; |
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131 | for (int j = 0 ; j < d.length ; j++) { |
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132 | sv.ptr[i+j] = 0; |
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133 | } |
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134 | i += d.length; |
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135 | } |
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136 | } |
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137 | if ((*n) == nmax) break; |
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138 | } |
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139 | result = (sstr_t*) malloc(sizeof(sstr_t) * (*n)); |
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140 | |
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141 | char *pptr = sv.ptr; |
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142 | for (int i = 0 ; i < *n ; i++) { |
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143 | size_t l = strlen(pptr); |
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144 | char* ptr = (char*) malloc(l + 1); |
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145 | memcpy(ptr, pptr, l); |
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146 | ptr[l] = 0; |
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147 | |
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148 | result[i] = sstrn(ptr, l); |
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149 | pptr += l + d.length; |
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150 | } |
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151 | |
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152 | free(sv.ptr); |
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153 | |
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154 | return result; |
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155 | } |
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156 | |
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157 | int sstrcmp(sstr_t s1, sstr_t s2) { |
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158 | return strncmp(s1.ptr, s2.ptr, s1.length>s2.length ? s2.length: s1.length); |
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159 | } |
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160 | |
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161 | sstr_t sstrdup(sstr_t s) { |
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162 | sstr_t newstring; |
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163 | newstring.ptr = (char*) malloc(s.length + 1); |
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164 | if (newstring.ptr != NULL) { |
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165 | newstring.length = s.length; |
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166 | newstring.ptr[newstring.length] = 0; |
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167 | |
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168 | memcpy(newstring.ptr, s.ptr, s.length); |
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169 | } |
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170 | |
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171 | return newstring; |
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172 | } |