1 /* sdiff-format output routines for GNU DIFF. 2 3 Copyright (C) 1991-1993, 1998, 2001-2002, 2004, 2009-2013 Free Software 4 Foundation, Inc. 5 6 This file is part of GNU DIFF. 7 8 GNU DIFF is distributed in the hope that it will be useful, 9 but WITHOUT ANY WARRANTY. No author or distributor 10 accepts responsibility to anyone for the consequences of using it 11 or for whether it serves any particular purpose or works at all, 12 unless he says so in writing. Refer to the GNU General Public 13 License for full details. 14 15 Everyone is granted permission to copy, modify and redistribute 16 GNU DIFF, but only under the conditions described in the 17 GNU General Public License. A copy of this license is 18 supposed to have been given to you along with GNU DIFF so you 19 can know your rights and responsibilities. It should be in a 20 file named COPYING. Among other things, the copyright notice 21 and this notice must be preserved on all copies. */ 22 23 #include "diff.h" 24 25 #include <wchar.h> 26 27 static void print_sdiff_common_lines (lin, lin); 28 static void print_sdiff_hunk (struct change *); 29 30 /* Next line number to be printed in the two input files. */ 31 static lin next0, next1; 32 33 /* Print the edit-script SCRIPT as a sdiff style output. */ 34 35 void 36 print_sdiff_script (struct change *script) 37 { 38 begin_output (); 39 40 next0 = next1 = - files[0].prefix_lines; 41 print_script (script, find_change, print_sdiff_hunk); 42 43 print_sdiff_common_lines (files[0].valid_lines, files[1].valid_lines); 44 } 45 46 /* Tab from column FROM to column TO, where FROM <= TO. Yield TO. */ 47 48 static size_t 49 tab_from_to (size_t from, size_t to) 50 { 51 FILE *out = outfile; 52 size_t tab; 53 size_t tab_size = tabsize; 54 55 if (!expand_tabs) 56 for (tab = from + tab_size - from % tab_size; tab <= to; tab += tab_size) 57 { 58 putc ('\t', out); 59 from = tab; 60 } 61 while (from++ < to) 62 putc (' ', out); 63 return to; 64 } 65 66 /* Print the text for half an sdiff line. This means truncate to 67 width observing tabs, and trim a trailing newline. Return the 68 last column written (not the number of chars). */ 69 70 static size_t 71 print_half_line (char const *const *line, size_t indent, size_t out_bound) 72 { 73 FILE *out = outfile; 74 register size_t in_position = 0; 75 register size_t out_position = 0; 76 register char const *text_pointer = line[0]; 77 register char const *text_limit = line[1]; 78 mbstate_t mbstate = { 0 }; 79 80 while (text_pointer < text_limit) 81 { 82 char const *tp0 = text_pointer; 83 register char c = *text_pointer++; 84 85 switch (c) 86 { 87 case '\t': 88 { 89 size_t spaces = tabsize - in_position % tabsize; 90 if (in_position == out_position) 91 { 92 size_t tabstop = out_position + spaces; 93 if (expand_tabs) 94 { 95 if (out_bound < tabstop) 96 tabstop = out_bound; 97 for (; out_position < tabstop; out_position++) 98 putc (' ', out); 99 } 100 else 101 if (tabstop < out_bound) 102 { 103 out_position = tabstop; 104 putc (c, out); 105 } 106 } 107 in_position += spaces; 108 } 109 break; 110 111 case '\r': 112 { 113 putc (c, out); 114 tab_from_to (0, indent); 115 in_position = out_position = 0; 116 } 117 break; 118 119 case '\b': 120 if (in_position != 0 && --in_position < out_bound) 121 { 122 if (out_position <= in_position) 123 /* Add spaces to make up for suppressed tab past out_bound. */ 124 for (; out_position < in_position; out_position++) 125 putc (' ', out); 126 else 127 { 128 out_position = in_position; 129 putc (c, out); 130 } 131 } 132 break; 133 134 default: 135 { 136 wchar_t wc; 137 size_t bytes = mbrtowc (&wc, tp0, text_limit - tp0, &mbstate); 138 139 if (0 < bytes && bytes < (size_t) -2) 140 { 141 int width = wcwidth (wc); 142 if (0 < width) 143 in_position += width; 144 if (in_position <= out_bound) 145 { 146 out_position = in_position; 147 fwrite (tp0, 1, bytes, stdout); 148 } 149 text_pointer = tp0 + bytes; 150 break; 151 } 152 } 153 /* Fall through. */ 154 case '\f': 155 case '\v': 156 if (in_position < out_bound) 157 putc (c, out); 158 break; 159 160 case ' ': case '!': case '"': case '#': case '%': 161 case '&': case '\'': case '(': case ')': case '*': 162 case '+': case ',': case '-': case '.': case '/': 163 case '0': case '1': case '2': case '3': case '4': 164 case '5': case '6': case '7': case '8': case '9': 165 case ':': case ';': case '<': case '=': case '>': 166 case '?': 167 case 'A': case 'B': case 'C': case 'D': case 'E': 168 case 'F': case 'G': case 'H': case 'I': case 'J': 169 case 'K': case 'L': case 'M': case 'N': case 'O': 170 case 'P': case 'Q': case 'R': case 'S': case 'T': 171 case 'U': case 'V': case 'W': case 'X': case 'Y': 172 case 'Z': 173 case '[': case '\\': case ']': case '^': case '_': 174 case 'a': case 'b': case 'c': case 'd': case 'e': 175 case 'f': case 'g': case 'h': case 'i': case 'j': 176 case 'k': case 'l': case 'm': case 'n': case 'o': 177 case 'p': case 'q': case 'r': case 's': case 't': 178 case 'u': case 'v': case 'w': case 'x': case 'y': 179 case 'z': case '{': case '|': case '}': case '~': 180 /* These characters are printable ASCII characters. */ 181 if (in_position++ < out_bound) 182 { 183 out_position = in_position; 184 putc (c, out); 185 } 186 break; 187 188 case '\n': 189 return out_position; 190 } 191 } 192 193 return out_position; 194 } 195 196 /* Print side by side lines with a separator in the middle. 197 0 parameters are taken to indicate white space text. 198 Blank lines that can easily be caught are reduced to a single newline. */ 199 200 static void 201 print_1sdiff_line (char const *const *left, char sep, 202 char const *const *right) 203 { 204 FILE *out = outfile; 205 size_t hw = sdiff_half_width; 206 size_t c2o = sdiff_column2_offset; 207 size_t col = 0; 208 bool put_newline = false; 209 210 if (left) 211 { 212 put_newline |= left[1][-1] == '\n'; 213 col = print_half_line (left, 0, hw); 214 } 215 216 if (sep != ' ') 217 { 218 col = tab_from_to (col, (hw + c2o - 1) / 2) + 1; 219 if (sep == '|' && put_newline != (right[1][-1] == '\n')) 220 sep = put_newline ? '/' : '\\'; 221 putc (sep, out); 222 } 223 224 if (right) 225 { 226 put_newline |= right[1][-1] == '\n'; 227 if (**right != '\n') 228 { 229 col = tab_from_to (col, c2o); 230 print_half_line (right, col, hw); 231 } 232 } 233 234 if (put_newline) 235 putc ('\n', out); 236 } 237 238 /* Print lines common to both files in side-by-side format. */ 239 static void 240 print_sdiff_common_lines (lin limit0, lin limit1) 241 { 242 lin i0 = next0, i1 = next1; 243 244 if (!suppress_common_lines && (i0 != limit0 || i1 != limit1)) 245 { 246 if (sdiff_merge_assist) 247 { 248 long int len0 = limit0 - i0; 249 long int len1 = limit1 - i1; 250 fprintf (outfile, "i%ld,%ld\n", len0, len1); 251 } 252 253 if (!left_column) 254 { 255 while (i0 != limit0 && i1 != limit1) 256 print_1sdiff_line (&files[0].linbuf[i0++], ' ', 257 &files[1].linbuf[i1++]); 258 while (i1 != limit1) 259 print_1sdiff_line (0, ')', &files[1].linbuf[i1++]); 260 } 261 while (i0 != limit0) 262 print_1sdiff_line (&files[0].linbuf[i0++], '(', 0); 263 } 264 265 next0 = limit0; 266 next1 = limit1; 267 } 268 269 /* Print a hunk of an sdiff diff. 270 This is a contiguous portion of a complete edit script, 271 describing changes in consecutive lines. */ 272 273 static void 274 print_sdiff_hunk (struct change *hunk) 275 { 276 lin first0, last0, first1, last1; 277 register lin i, j; 278 279 /* Determine range of line numbers involved in each file. */ 280 enum changes changes = 281 analyze_hunk (hunk, &first0, &last0, &first1, &last1); 282 if (!changes) 283 return; 284 285 /* Print out lines up to this change. */ 286 print_sdiff_common_lines (first0, first1); 287 288 if (sdiff_merge_assist) 289 { 290 long int len0 = last0 - first0 + 1; 291 long int len1 = last1 - first1 + 1; 292 fprintf (outfile, "c%ld,%ld\n", len0, len1); 293 } 294 295 /* Print "xxx | xxx " lines. */ 296 if (changes == CHANGED) 297 { 298 for (i = first0, j = first1; i <= last0 && j <= last1; i++, j++) 299 print_1sdiff_line (&files[0].linbuf[i], '|', &files[1].linbuf[j]); 300 changes = (i <= last0 ? OLD : 0) + (j <= last1 ? NEW : 0); 301 next0 = first0 = i; 302 next1 = first1 = j; 303 } 304 305 /* Print " > xxx " lines. */ 306 if (changes & NEW) 307 { 308 for (j = first1; j <= last1; ++j) 309 print_1sdiff_line (0, '>', &files[1].linbuf[j]); 310 next1 = j; 311 } 312 313 /* Print "xxx < " lines. */ 314 if (changes & OLD) 315 { 316 for (i = first0; i <= last0; ++i) 317 print_1sdiff_line (&files[0].linbuf[i], '<', 0); 318 next0 = i; 319 } 320 } 321