71
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1 /*
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2 * hbuf.c -- History buffer implementation
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3 *
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4 * Copyright (C) 2005 Mikael Berthe <bmikael@lists.lilotux.net>
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5 *
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6 * This program is free software; you can redistribute it and/or modify
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7 * it under the terms of the GNU General Public License as published by
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8 * the Free Software Foundation; either version 2 of the License, or (at
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9 * your option) any later version.
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10 *
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11 * This program is distributed in the hope that it will be useful, but
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12 * WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 * General Public License for more details.
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15 *
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16 * You should have received a copy of the GNU General Public License
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17 * along with this program; if not, write to the Free Software
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18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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19 * USA
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20 */
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21
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22 #include <string.h>
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23
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24 #include "hbuf.h"
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25
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26
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27 /* This is a private structure type */
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28
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75
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29 #define PREFIX_LENGTH 32
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71
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30 typedef struct {
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31 char *ptr;
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32 char *ptr_end;
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33 guchar flags;
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34
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35 // XXX This should certainly be a pointer, and be allocated only when needed
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36 // (for ex. when HBB_FLAG_PERSISTENT is set).
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37 struct { // hbuf_line_info
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38 char *ptr_end_alloc;
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75
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39 char prefix[PREFIX_LENGTH];
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71
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40 } persist;
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41 } hbuf_block;
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42
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43
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75
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44 // hbuf_add_line(p_hbuf, text, prefix, width)
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71
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45 // Add a line to the given buffer. If width is not null, then lines are
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46 // wrapped at this length.
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47 //
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48 // Note 1: Splitting according to width won't work if there are tabs; they
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49 // should be expanded before.
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50 // Note 2: width does not include the ending \0.
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75
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51 void hbuf_add_line(GList **p_hbuf, const char *text, const char *prefix,
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52 unsigned int width)
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71
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53 {
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54 GList *hbuf = *p_hbuf;
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55 char *line, *cr, *end;
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56
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57 if (!text) return;
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58
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59 hbuf_block *hbuf_block_elt = g_new0(hbuf_block, 1);
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75
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60 if (prefix)
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61 strncpy(hbuf_block_elt->persist.prefix, prefix, PREFIX_LENGTH-1);
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71
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62 if (!hbuf) {
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63 hbuf_block_elt->ptr = g_new(char, HBB_BLOCKSIZE);
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64 hbuf_block_elt->flags = HBB_FLAG_ALLOC | HBB_FLAG_PERSISTENT;
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65 hbuf_block_elt->persist.ptr_end_alloc = hbuf_block_elt->ptr + HBB_BLOCKSIZE;
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66 *p_hbuf = g_list_append(*p_hbuf, hbuf_block_elt);
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67 } else {
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68 hbuf_block *hbuf_b_prev = g_list_last(hbuf)->data;
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69 hbuf_block_elt->ptr = hbuf_b_prev->ptr_end;
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70 hbuf_block_elt->flags = HBB_FLAG_PERSISTENT;
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71 hbuf_block_elt->persist.ptr_end_alloc = hbuf_b_prev->persist.ptr_end_alloc;
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72 *p_hbuf = g_list_append(*p_hbuf, hbuf_block_elt);
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73 }
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74
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75 if (strlen(text) >= HBB_BLOCKSIZE) {
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76 // Too long
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77 text = "[ERR:LINE_TOO_LONG]";
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78 }
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79 if (hbuf_block_elt->ptr + strlen(text) >= hbuf_block_elt->persist.ptr_end_alloc) {
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80 // Too long for the current allocated bloc, we need another one
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81 hbuf_block_elt->ptr = g_new0(char, HBB_BLOCKSIZE);
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82 hbuf_block_elt->flags = HBB_FLAG_ALLOC | HBB_FLAG_PERSISTENT;
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83 hbuf_block_elt->persist.ptr_end_alloc = hbuf_block_elt->ptr + HBB_BLOCKSIZE;
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84 }
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85
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86 line = hbuf_block_elt->ptr;
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87 // Ok, now we can copy the text..
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88 strcpy(line, text);
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89 hbuf_block_elt->ptr_end = line + strlen(line) + 1;
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90 end = hbuf_block_elt->ptr_end;
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91
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92 // Let's add non-persistent blocs if necessary
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93 // - If there are '\n' in the string
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94 // - If length > width (and width != 0)
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95 cr = strchr(line, '\n');
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96 while (cr || (width && strlen(line) > width)) {
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97 hbuf_block *hbuf_b_prev = hbuf_block_elt;
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98
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99 if (!width || (cr && (cr - line <= (int)width))) {
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100 // Carriage return
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101 *cr = 0;
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102 hbuf_block_elt->ptr_end = cr;
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103 // Create another persistent block
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104 hbuf_block_elt = g_new0(hbuf_block, 1);
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105 hbuf_block_elt->ptr = hbuf_b_prev->ptr_end + 1; // == cr+1
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106 hbuf_block_elt->ptr_end = end;
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107 hbuf_block_elt->flags = HBB_FLAG_PERSISTENT;
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108 hbuf_block_elt->persist.ptr_end_alloc = hbuf_b_prev->persist.ptr_end_alloc;
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109 *p_hbuf = g_list_append(*p_hbuf, hbuf_block_elt);
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110 line = hbuf_block_elt->ptr;
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111 } else {
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112 // We need to break where we can find a space char
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113 char *br; // break pointer
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114 for (br = line + width; br > line && *br != 32 && *br != 9; br--)
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115 ;
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116 if (br <= line)
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117 br = line + width;
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118 else
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119 br++;
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120 hbuf_block_elt->ptr_end = br;
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121 // Create another block, non-persistent
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122 hbuf_block_elt = g_new0(hbuf_block, 1);
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123 hbuf_block_elt->ptr = hbuf_b_prev->ptr_end; // == br
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124 hbuf_block_elt->ptr_end = end;
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125 hbuf_block_elt->flags = 0;
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126 hbuf_block_elt->persist.ptr_end_alloc = hbuf_b_prev->persist.ptr_end_alloc;
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127 *p_hbuf = g_list_append(*p_hbuf, hbuf_block_elt);
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128 line = hbuf_block_elt->ptr;
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129 }
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130 cr = strchr(line, '\n');
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131 }
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132 }
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133
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134 // hbuf_free()
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135 // Destroys all hbuf list.
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136 void hbuf_free(GList **p_hbuf)
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137 {
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138 hbuf_block *hbuf_b_elt;
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139 GList *hbuf_elt;
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140 GList *first_elt = g_list_first(*p_hbuf);
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141
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142 for (hbuf_elt = first_elt; hbuf_elt; hbuf_elt = g_list_next(hbuf_elt)) {
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143 hbuf_b_elt = (hbuf_block*)(hbuf_elt->data);
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144 if (hbuf_b_elt->flags & HBB_FLAG_ALLOC) {
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145 g_free(hbuf_b_elt->ptr);
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146 }
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147 }
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148
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149 g_list_free(*p_hbuf);
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150 *p_hbuf = NULL;
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151 }
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152
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153 // hbuf_rebuild()
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154 // Rebuild all hbuf list, with the new width.
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155 // If width == 0, lines are not wrapped.
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156 void hbuf_rebuild(GList **p_hbuf, unsigned int width)
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157 {
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158 GList *first_elt, *curr_elt, *next_elt;
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159 hbuf_block *hbuf_b_curr, *hbuf_b_next;
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160
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161 first_elt = g_list_first(*p_hbuf);
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162
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163 // #1 Remove non-persistent blocks (ptr_end should be updated!)
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164 curr_elt = first_elt;
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165 while (curr_elt) {
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166 next_elt = g_list_next(curr_elt);
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167 // Last element?
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168 if (!next_elt)
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169 break;
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170 hbuf_b_curr = (hbuf_block*)(curr_elt->data);
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171 hbuf_b_next = (hbuf_block*)(next_elt->data);
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172 // Is next line not-persistent?
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173 if (!(hbuf_b_next->flags & HBB_FLAG_PERSISTENT)) {
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174 hbuf_b_curr->ptr_end = hbuf_b_next->ptr_end;
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175 g_list_delete_link(curr_elt, next_elt);
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176 next_elt = g_list_next(curr_elt);
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177 } else
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178 curr_elt = next_elt;
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179 }
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180 // #2 Go back to head and create non-persistent blocks when needed
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181 if (width) {
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182 char *line, *end;
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183 curr_elt = first_elt;
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184
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185 while (curr_elt) {
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186 hbuf_b_curr = (hbuf_block*)(curr_elt->data);
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187 line = hbuf_b_curr->ptr;
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188 if (strlen(line) > width) {
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189 hbuf_block *hbuf_b_prev = hbuf_b_curr;
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190
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191 // We need to break where we can find a space char
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192 char *br; // break pointer
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193 for (br = line + width; br > line && *br != 32 && *br != 9; br--)
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194 ;
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195 if (br <= line)
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196 br = line + width;
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197 else
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198 br++;
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199 end = hbuf_b_curr->ptr_end;
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200 hbuf_b_curr->ptr_end = br;
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201 // Create another block, non-persistent
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202 hbuf_b_curr = g_new0(hbuf_block, 1);
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203 hbuf_b_curr->ptr = hbuf_b_prev->ptr_end; // == br
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204 hbuf_b_curr->ptr_end = end;
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205 hbuf_b_curr->flags = 0;
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206 hbuf_b_curr->persist.ptr_end_alloc = hbuf_b_prev->persist.ptr_end_alloc;
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207 /*
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208 // Is there a better way?
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209 if (g_list_next(curr_elt))
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210 g_list_insert_before(*p_hbuf, curr_elt->next, hbuf_b_curr);
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211 else
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212 *p_hbuf = g_list_append(*p_hbuf, hbuf_b_curr);
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213 */
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214 // This is OK because insert_before(NULL) <==> append()
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215 g_list_insert_before(*p_hbuf, curr_elt->next, hbuf_b_curr);
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216 }
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217 curr_elt = g_list_next(curr_elt);
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218 }
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219 }
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220 }
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221
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222 // hbuf_get_lines(hbuf, n, where)
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223 // Returns an array of 2*n pointers (for n prefixes + n lines from hbuf)
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224 // (prefix line 1, line 1, prefix line 2, line 2, etc.)
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225 // (The first line will be the line currently pointed by hbuf)
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226 // Note:The caller should free the array after use.
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227 char **hbuf_get_lines(GList *hbuf, unsigned int n)
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228 {
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229 unsigned int i;
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230
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231 char **array = g_new0(char*, n*2);
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232 char **array_elt = array;
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233
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234 for (i=0 ; i < n ; i++) {
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235 if (hbuf) {
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236 hbuf_block *blk = (hbuf_block*)(hbuf->data);
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237 int maxlen;
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238 maxlen = blk->ptr_end - blk->ptr;
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239 *array_elt++ = blk->persist.prefix;
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240 *array_elt++ = g_strndup(blk->ptr, maxlen);
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241 hbuf = g_list_next(hbuf);
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242 } else
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243 *array_elt++ = NULL;
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244 }
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245
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246 return array;
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247 }
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248
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