1 | /* |
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2 | * $Id: graph.c,v 1.6 2005/04/15 23:24:21 fabio Exp $ |
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3 | */ |
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4 | |
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5 | #include "graph_int.h" |
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6 | |
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7 | int g_unique_id; |
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8 | |
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9 | graph_t * |
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10 | g_alloc(void) |
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11 | { |
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12 | graph_t_int *graph = ALLOC(graph_t_int,1); |
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13 | |
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14 | graph->user_data = (gGeneric) NULL; |
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15 | graph->v_list = lsCreate(); |
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16 | graph->e_list = lsCreate(); |
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17 | |
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18 | return((graph_t *) graph); |
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19 | } |
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20 | |
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21 | void |
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22 | g_free( |
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23 | graph_t *g, |
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24 | void (*f_free_g)(gGeneric), |
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25 | void (*f_free_v)(gGeneric), |
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26 | void (*f_free_e)(gGeneric)) |
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27 | { |
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28 | lsGen gen; |
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29 | vertex_t *v; |
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30 | edge_t *e; |
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31 | |
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32 | if (g == NIL(graph_t)) { |
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33 | return; |
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34 | } |
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35 | if (f_free_g != (void (*)(gGeneric)) NULL) { |
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36 | (*f_free_g)(g->user_data); |
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37 | } |
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38 | foreach_vertex (g,gen,v) { |
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39 | if (f_free_v != (void (*)(gGeneric)) NULL) { |
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40 | (*f_free_v)(v->user_data); |
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41 | } |
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42 | (void) lsDestroy(g_get_in_edges(v),(void (*)(lsGeneric)) NULL); |
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43 | (void) lsDestroy(g_get_out_edges(v),(void (*)(lsGeneric)) NULL); |
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44 | FREE(v); |
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45 | } |
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46 | foreach_edge (g,gen,e) { |
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47 | if (f_free_e != (void (*)(gGeneric)) NULL) { |
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48 | (*f_free_e)(e->user_data); |
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49 | } |
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50 | FREE(e); |
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51 | } |
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52 | (void) lsDestroy(g_get_vertices(g),(void (*)(lsGeneric)) NULL); |
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53 | (void) lsDestroy(g_get_edges(g),(void (*)(lsGeneric)) NULL); |
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54 | FREE(g); |
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55 | } |
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56 | |
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57 | void |
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58 | g_check(graph_t *g) |
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59 | { |
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60 | vertex_t *v, *source, *dest; |
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61 | edge_t *e, *test; |
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62 | lsGen gen, gen2; |
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63 | int found; |
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64 | |
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65 | if (g == NIL(graph_t)) { |
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66 | return; |
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67 | } |
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68 | foreach_edge (g,gen,e) { |
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69 | source = g_e_source(e); |
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70 | dest = g_e_dest(e); |
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71 | if (source == NIL(vertex_t)) { |
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72 | fail("g_check: Edge has no source"); |
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73 | } |
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74 | if (dest == NIL(vertex_t)) { |
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75 | fail("g_check: Edge has no destination"); |
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76 | } |
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77 | if (g_vertex_graph(source) != g_vertex_graph(dest)) { |
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78 | fail("g_check: Edge connects different graphs"); |
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79 | } |
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80 | found = FALSE; |
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81 | foreach_out_edge (source,gen2,test) { |
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82 | if (test == e) { |
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83 | found = TRUE; |
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84 | (void) lsFinish(gen2); |
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85 | break; |
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86 | } |
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87 | } |
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88 | if (found == FALSE) { |
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89 | fail("g_check: Vertex does not point back to edge"); |
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90 | } |
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91 | found = FALSE; |
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92 | foreach_in_edge (dest,gen2,test) { |
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93 | if (test == e) { |
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94 | found = TRUE; |
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95 | (void) lsFinish(gen2); |
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96 | break; |
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97 | } |
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98 | } |
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99 | if (found == FALSE) { |
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100 | fail("g_check: Vertex does not point back to edge"); |
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101 | } |
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102 | } |
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103 | foreach_vertex (g,gen,v) { |
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104 | if (g_vertex_graph(v) != g) { |
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105 | fail("g_check: Vertex not a member of graph"); |
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106 | } |
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107 | if (lsLength(g_get_in_edges(v)) + lsLength(g_get_out_edges(v)) == 0) { |
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108 | (void) fprintf(stderr,"Warning: g_check: Unconnected vertex\n"); |
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109 | continue; |
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110 | } |
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111 | foreach_in_edge(v,gen2,test) { |
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112 | if (g_e_dest(test) != v) { |
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113 | fail("g_check: Edge does not point back to vertex"); |
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114 | } |
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115 | } |
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116 | foreach_out_edge(v,gen2,test) { |
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117 | if (g_e_source(test) != v) { |
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118 | fail("g_check: Edge does not point back to vertex"); |
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119 | } |
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120 | } |
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121 | } |
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122 | } |
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123 | |
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124 | graph_t * |
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125 | g_dup( |
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126 | graph_t *g, |
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127 | gGeneric (*f_copy_g)(gGeneric), |
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128 | gGeneric (*f_copy_v)(gGeneric), |
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129 | gGeneric (*f_copy_e)(gGeneric)) |
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130 | { |
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131 | graph_t *newg; |
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132 | vertex_t *v, *new_v, *from, *to; |
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133 | edge_t *e, *new_e; |
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134 | st_table *ptrtable = st_init_table(st_ptrcmp,st_ptrhash); |
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135 | lsGen gen; |
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136 | |
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137 | newg = g_alloc(); |
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138 | if (g == NIL(graph_t)) { |
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139 | return(newg); |
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140 | } |
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141 | |
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142 | if (f_copy_g == (gGeneric (*)(gGeneric)) NULL) { |
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143 | newg->user_data = g->user_data; |
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144 | } |
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145 | else { |
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146 | newg->user_data = (*f_copy_g)(g->user_data); |
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147 | } |
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148 | foreach_vertex (g,gen,v) { |
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149 | new_v = g_add_vertex(newg); |
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150 | if (f_copy_v == (gGeneric (*)(gGeneric)) NULL) { |
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151 | new_v->user_data = v->user_data; |
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152 | } |
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153 | else { |
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154 | new_v->user_data = (*f_copy_v)(v->user_data); |
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155 | } |
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156 | (void) st_insert(ptrtable,(char *) v,(char *) new_v); |
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157 | } |
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158 | foreach_edge (g,gen,e) { |
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159 | (void) st_lookup(ptrtable,g_e_source(e),&from); |
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160 | (void) st_lookup(ptrtable,g_e_dest(e),&to); |
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161 | new_e = g_add_edge(from,to); |
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162 | if (f_copy_e == (gGeneric (*)(gGeneric)) NULL) { |
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163 | new_e->user_data = e->user_data; |
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164 | } |
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165 | else { |
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166 | new_e->user_data = (*f_copy_e)(e->user_data); |
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167 | } |
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168 | } |
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169 | st_free_table(ptrtable); |
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170 | return(newg); |
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171 | } |
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172 | |
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173 | array_t * |
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174 | g_graph_sort(graph_t *g, int (*cmp)(const void *, const void *)) |
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175 | { |
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176 | int i; |
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177 | lsGen gen; |
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178 | vertex_t *v; |
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179 | array_t *v_array; |
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180 | |
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181 | i = 0; |
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182 | v_array = array_alloc(vertex_t *,0); |
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183 | |
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184 | foreach_vertex (g,gen,v) { |
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185 | array_insert(vertex_t *,v_array,i++,v); |
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186 | } |
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187 | array_sort(v_array,cmp); |
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188 | return(v_array); |
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189 | } |
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190 | |
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191 | lsList |
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192 | g_get_edges(graph_t *g) |
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193 | { |
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194 | if (g == NIL(graph_t)) { |
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195 | fail("g_get_edges: Null graph"); |
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196 | } |
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197 | return(((graph_t_int *) g)->e_list); |
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198 | } |
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199 | |
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200 | lsList |
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201 | g_get_in_edges(vertex_t *v) |
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202 | { |
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203 | if (v == NIL(vertex_t)) { |
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204 | fail("g_get_in_edges: Null vertex"); |
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205 | } |
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206 | return(((vertex_t_int *) v)->in_list); |
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207 | } |
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208 | |
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209 | lsList |
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210 | g_get_out_edges(vertex_t *v) |
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211 | { |
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212 | if (v == NIL(vertex_t)) { |
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213 | fail("g_get_out_edges: Null vertex"); |
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214 | } |
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215 | return(((vertex_t_int *) v)->out_list); |
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216 | } |
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217 | |
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218 | edge_t * |
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219 | g_add_edge(vertex_t *v1, vertex_t *v2) |
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220 | { |
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221 | edge_t_int *edge; |
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222 | lsHandle handle; |
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223 | graph_t *g; |
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224 | |
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225 | if (v1 == NIL(vertex_t) || v2 == NIL(vertex_t)) { |
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226 | fail("g_add_edge: Null vertex"); |
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227 | } |
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228 | g = g_vertex_graph(v1); |
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229 | if (g != g_vertex_graph(v2)) { |
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230 | fail("g_add_edge: Edge connects different graphs"); |
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231 | } |
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232 | edge = ALLOC(edge_t_int,1); |
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233 | (void) lsNewEnd(g_get_edges(g),(lsGeneric) edge,&handle); |
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234 | edge->user_data = (gGeneric) NULL; |
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235 | edge->from = (vertex_t_int *) v1; |
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236 | edge->to = (vertex_t_int *) v2; |
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237 | edge->id = g_unique_id++; |
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238 | edge->handle = handle; |
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239 | (void) lsNewEnd(g_get_out_edges(v1),(lsGeneric) edge,LS_NH); |
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240 | (void) lsNewEnd(g_get_in_edges(v2),(lsGeneric) edge,LS_NH); |
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241 | |
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242 | return((edge_t *) edge); |
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243 | } |
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244 | |
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245 | static void |
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246 | g_del_from_list(lsList list, lsGeneric item) |
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247 | { |
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248 | lsGen gen; |
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249 | lsGeneric looking,dummy; |
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250 | lsHandle handle; |
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251 | |
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252 | gen = lsStart(list); |
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253 | while (lsNext(gen,&looking,&handle) != LS_NOMORE) { |
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254 | if (item == looking) { |
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255 | if (lsRemoveItem(handle,&dummy) != LS_OK) { |
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256 | fail("g_del_from_list: Can't remove edge"); |
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257 | } |
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258 | break; |
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259 | } |
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260 | } |
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261 | (void) lsFinish(gen); |
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262 | } |
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263 | |
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264 | void |
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265 | g_delete_edge(edge_t *e, void (*f_free_e)(gGeneric)) |
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266 | { |
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267 | lsGeneric junk; |
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268 | |
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269 | if (e == NIL(edge_t)) { |
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270 | fail("g_delete_edge: Null edge"); |
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271 | } |
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272 | g_del_from_list(g_get_out_edges(g_e_source(e)),(lsGeneric) e); |
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273 | g_del_from_list(g_get_in_edges(g_e_dest(e)),(lsGeneric) e); |
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274 | |
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275 | (void) lsRemoveItem(((edge_t_int *) e)->handle,&junk); |
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276 | if (f_free_e != (void (*)(gGeneric)) NULL) { |
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277 | (*f_free_e)(e->user_data); |
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278 | } |
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279 | FREE(e); |
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280 | } |
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281 | |
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282 | graph_t * |
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283 | g_edge_graph(edge_t *e) |
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284 | { |
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285 | if (e == NIL(edge_t)) { |
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286 | fail("g_edge_graph: Null edge"); |
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287 | } |
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288 | return((graph_t *) (((edge_t_int *) e)->to->g)); |
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289 | } |
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290 | |
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291 | vertex_t * |
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292 | g_e_source(edge_t *e) |
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293 | { |
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294 | if (e == NIL(edge_t)) { |
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295 | fail("g_e_source: Null edge"); |
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296 | } |
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297 | return((vertex_t *) (((edge_t_int *) e)->from)); |
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298 | } |
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299 | |
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300 | vertex_t * |
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301 | g_e_dest(edge_t *e) |
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302 | { |
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303 | if (e == NIL(edge_t)) { |
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304 | fail("g_e_dest: Null edge"); |
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305 | } |
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306 | return((vertex_t *) (((edge_t_int *) e)->to)); |
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307 | } |
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308 | |
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309 | |
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310 | lsList |
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311 | g_get_vertices(graph_t *g) |
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312 | { |
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313 | if (g == NIL(graph_t)) { |
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314 | fail("g_get_vertices: Null graph"); |
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315 | } |
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316 | return(((graph_t_int *) g)->v_list); |
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317 | } |
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318 | |
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319 | vertex_t * |
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320 | g_add_vertex(graph_t *g) |
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321 | { |
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322 | lsHandle handle; |
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323 | vertex_t_int *vert; |
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324 | |
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325 | if (g == NIL(graph_t)) { |
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326 | fail("g_add_vertex: Null graph"); |
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327 | } |
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328 | vert = ALLOC(vertex_t_int,1); |
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329 | if (lsNewEnd(g_get_vertices(g),(lsGeneric) vert,&handle) != LS_OK) { |
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330 | fail("g_add_vertex: Can't add vertex"); |
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331 | } |
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332 | vert->user_data = (gGeneric) NULL; |
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333 | vert->g = (graph_t_int *) g; |
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334 | vert->in_list = lsCreate(); |
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335 | vert->out_list = lsCreate(); |
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336 | vert->id = g_unique_id++; |
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337 | vert->handle = handle; |
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338 | return((vertex_t *) vert); |
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339 | } |
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340 | |
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341 | void |
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342 | g_delete_vertex( |
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343 | vertex_t *v, |
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344 | void (*f_free_v)(gGeneric), |
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345 | void (*f_free_e)(gGeneric)) |
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346 | { |
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347 | edge_t *e; |
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348 | lsGeneric junk; |
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349 | lsGen gen; |
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350 | |
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351 | if (v == NIL(vertex_t)) { |
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352 | fail("g_delete_vertex: Null vertex"); |
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353 | } |
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354 | if (f_free_v != (void (*)(gGeneric)) NULL) { |
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355 | (*f_free_v)(v->user_data); |
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356 | } |
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357 | foreach_in_edge (v,gen,e) { |
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358 | g_del_from_list(g_get_out_edges(g_e_source(e)),(lsGeneric) e); |
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359 | if (f_free_e != (void (*)(gGeneric)) NULL) { |
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360 | (*f_free_e)(e->user_data); |
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361 | } |
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362 | if (lsRemoveItem(((edge_t_int *) e)->handle,&junk) != LS_OK) { |
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363 | fail("g_delete_vertex: Can't remove edge from graph"); |
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364 | } |
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365 | FREE(e); |
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366 | } |
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367 | foreach_out_edge (v,gen,e) { |
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368 | g_del_from_list(g_get_in_edges(g_e_dest(e)),(lsGeneric) e); |
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369 | if (f_free_e != (void (*)(gGeneric)) NULL) { |
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370 | (*f_free_e)(e->user_data); |
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371 | } |
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372 | if (lsRemoveItem(((edge_t_int *) e)->handle,&junk) != LS_OK) { |
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373 | fail("g_delete_vertex: Can't remove edge from graph"); |
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374 | } |
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375 | FREE(e); |
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376 | } |
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377 | (void) lsDestroy(g_get_out_edges(v),(void (*)(lsGeneric)) NULL); |
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378 | (void) lsDestroy(g_get_in_edges(v),(void (*)(lsGeneric)) NULL); |
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379 | (void) lsRemoveItem(((vertex_t_int *) v)->handle,&junk); |
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380 | FREE(v); |
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381 | } |
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382 | |
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383 | graph_t * |
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384 | g_vertex_graph(vertex_t *v) |
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385 | { |
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386 | if (v == NIL(vertex_t)) { |
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387 | fail("g_vertex_graph: Null vertex"); |
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388 | } |
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389 | return((graph_t *) ((vertex_t_int *) v)->g); |
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390 | } |
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