1 /* Shared definitions for GNU DIFF 2 Copyright (C) 1988, 89, 91, 92, 93, 97, 1998 Free Software Foundation, Inc. 3 4 This file is part of GNU DIFF. 5 6 GNU DIFF is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2, or (at your option) 9 any later version. 10 11 GNU DIFF is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 */ 17 18 #include "system.h" 19 #include <stdio.h> 20 #include <setjmp.h> 21 #include "regex.h" 22 #include "diffrun.h" 23 24 #define TAB_WIDTH 8 25 26 /* Variables for command line options */ 28 29 #ifndef GDIFF_MAIN 30 #define EXTERN extern 31 #else 32 #define EXTERN 33 #endif 34 35 /* The callbacks to use for output. */ 36 EXTERN const struct diff_callbacks *callbacks; 37 38 enum output_style { 39 /* Default output style. */ 40 OUTPUT_NORMAL, 41 /* Output the differences with lines of context before and after (-c). */ 42 OUTPUT_CONTEXT, 43 /* Output the differences in a unified context diff format (-u). */ 44 OUTPUT_UNIFIED, 45 /* Output the differences as commands suitable for `ed' (-e). */ 46 OUTPUT_ED, 47 /* Output the diff as a forward ed script (-f). */ 48 OUTPUT_FORWARD_ED, 49 /* Like -f, but output a count of changed lines in each "command" (-n). */ 50 OUTPUT_RCS, 51 /* Output merged #ifdef'd file (-D). */ 52 OUTPUT_IFDEF, 53 /* Output sdiff style (-y). */ 54 OUTPUT_SDIFF 55 }; 56 57 /* True for output styles that are robust, 58 i.e. can handle a file that ends in a non-newline. */ 59 #define ROBUST_OUTPUT_STYLE(S) ((S) != OUTPUT_ED && (S) != OUTPUT_FORWARD_ED) 60 61 EXTERN enum output_style output_style; 62 63 /* Nonzero if output cannot be generated for identical files. */ 64 EXTERN int no_diff_means_no_output; 65 66 /* Number of lines of context to show in each set of diffs. 67 This is zero when context is not to be shown. */ 68 EXTERN int context; 69 70 /* Consider all files as text files (-a). 71 Don't interpret codes over 0177 as implying a "binary file". */ 72 EXTERN int always_text_flag; 73 74 /* Number of lines to keep in identical prefix and suffix. */ 75 EXTERN int horizon_lines; 76 77 /* Ignore changes in horizontal white space (-b). */ 78 EXTERN int ignore_space_change_flag; 79 80 /* Ignore all horizontal white space (-w). */ 81 EXTERN int ignore_all_space_flag; 82 83 /* Ignore changes that affect only blank lines (-B). */ 84 EXTERN int ignore_blank_lines_flag; 85 86 /* 1 if lines may match even if their contents do not match exactly. 87 This depends on various options. */ 88 EXTERN int ignore_some_line_changes; 89 90 /* 1 if files may match even if their contents are not byte-for-byte identical. 91 This depends on various options. */ 92 EXTERN int ignore_some_changes; 93 94 /* Ignore differences in case of letters (-i). */ 95 EXTERN int ignore_case_flag; 96 97 /* File labels for `-c' output headers (-L). */ 98 EXTERN char *file_label[2]; 99 100 struct regexp_list 101 { 102 struct re_pattern_buffer buf; 103 struct regexp_list *next; 104 }; 105 106 /* Regexp to identify function-header lines (-F). */ 107 EXTERN struct regexp_list *function_regexp_list; 108 109 /* Ignore changes that affect only lines matching this regexp (-I). */ 110 EXTERN struct regexp_list *ignore_regexp_list; 111 112 /* Say only whether files differ, not how (-q). */ 113 EXTERN int no_details_flag; 114 115 /* Report files compared that match (-s). 116 Normally nothing is output when that happens. */ 117 EXTERN int print_file_same_flag; 118 119 /* Output the differences with exactly 8 columns added to each line 120 so that any tabs in the text line up properly (-T). */ 121 EXTERN int tab_align_flag; 122 123 /* Expand tabs in the output so the text lines up properly 124 despite the characters added to the front of each line (-t). */ 125 EXTERN int tab_expand_flag; 126 127 /* In directory comparison, specify file to start with (-S). 128 All file names less than this name are ignored. */ 129 EXTERN char *dir_start_file; 130 131 /* If a file is new (appears in only one dir) 132 include its entire contents (-N). 133 Then `patch' would create the file with appropriate contents. */ 134 EXTERN int entire_new_file_flag; 135 136 /* If a file is new (appears in only the second dir) 137 include its entire contents (-P). 138 Then `patch' would create the file with appropriate contents. */ 139 EXTERN int unidirectional_new_file_flag; 140 141 /* Pipe each file's output through pr (-l). */ 142 EXTERN int paginate_flag; 143 144 enum line_class { 145 /* Lines taken from just the first file. */ 146 OLD, 147 /* Lines taken from just the second file. */ 148 NEW, 149 /* Lines common to both files. */ 150 UNCHANGED, 151 /* A hunk containing both old and new lines (line groups only). */ 152 CHANGED 153 }; 154 155 /* Line group formats for old, new, unchanged, and changed groups. */ 156 EXTERN char *group_format[CHANGED + 1]; 157 158 /* Line formats for old, new, and unchanged lines. */ 159 EXTERN char *line_format[UNCHANGED + 1]; 160 161 /* If using OUTPUT_SDIFF print extra information to help the sdiff filter. */ 162 EXTERN int sdiff_help_sdiff; 163 164 /* Tell OUTPUT_SDIFF to show only the left version of common lines. */ 165 EXTERN int sdiff_left_only; 166 167 /* Tell OUTPUT_SDIFF to not show common lines. */ 168 EXTERN int sdiff_skip_common_lines; 169 170 /* The half line width and column 2 offset for OUTPUT_SDIFF. */ 171 EXTERN unsigned sdiff_half_width; 172 EXTERN unsigned sdiff_column2_offset; 173 174 /* String containing all the command options diff received, 175 with spaces between and at the beginning but none at the end. 176 If there were no options given, this string is empty. */ 177 EXTERN char * switch_string; 178 179 /* Nonzero means use heuristics for better speed. */ 180 EXTERN int heuristic; 181 182 /* Name of program the user invoked (for error messages). */ 183 EXTERN char *diff_program_name; 184 185 /* Jump buffer for nonlocal exits. */ 186 EXTERN jmp_buf diff_abort_buf; 187 #define DIFF_ABORT(retval) longjmp(diff_abort_buf, retval) 188 189 /* The result of comparison is an "edit script": a chain of `struct change'. 191 Each `struct change' represents one place where some lines are deleted 192 and some are inserted. 193 194 LINE0 and LINE1 are the first affected lines in the two files (origin 0). 195 DELETED is the number of lines deleted here from file 0. 196 INSERTED is the number of lines inserted here in file 1. 197 198 If DELETED is 0 then LINE0 is the number of the line before 199 which the insertion was done; vice versa for INSERTED and LINE1. */ 200 201 struct change 202 { 203 struct change *link; /* Previous or next edit command */ 204 int inserted; /* # lines of file 1 changed here. */ 205 int deleted; /* # lines of file 0 changed here. */ 206 int line0; /* Line number of 1st deleted line. */ 207 int line1; /* Line number of 1st inserted line. */ 208 char ignore; /* Flag used in context.c */ 209 }; 210 211 /* Structures that describe the input files. */ 213 214 /* Data on one input file being compared. */ 215 216 struct file_data { 217 int desc; /* File descriptor */ 218 char const *name; /* File name */ 219 struct stat stat; /* File status from fstat() */ 220 int dir_p; /* nonzero if file is a directory */ 221 222 /* Buffer in which text of file is read. */ 223 char * buffer; 224 /* Allocated size of buffer. */ 225 size_t bufsize; 226 /* Number of valid characters now in the buffer. */ 227 size_t buffered_chars; 228 229 /* Array of pointers to lines in the file. */ 230 char const **linbuf; 231 232 /* linbuf_base <= buffered_lines <= valid_lines <= alloc_lines. 233 linebuf[linbuf_base ... buffered_lines - 1] are possibly differing. 234 linebuf[linbuf_base ... valid_lines - 1] contain valid data. 235 linebuf[linbuf_base ... alloc_lines - 1] are allocated. */ 236 int linbuf_base, buffered_lines, valid_lines, alloc_lines; 237 238 /* Pointer to end of prefix of this file to ignore when hashing. */ 239 char const *prefix_end; 240 241 /* Count of lines in the prefix. 242 There are this many lines in the file before linbuf[0]. */ 243 int prefix_lines; 244 245 /* Pointer to start of suffix of this file to ignore when hashing. */ 246 char const *suffix_begin; 247 248 /* Vector, indexed by line number, containing an equivalence code for 249 each line. It is this vector that is actually compared with that 250 of another file to generate differences. */ 251 int *equivs; 252 253 /* Vector, like the previous one except that 254 the elements for discarded lines have been squeezed out. */ 255 int *undiscarded; 256 257 /* Vector mapping virtual line numbers (not counting discarded lines) 258 to real ones (counting those lines). Both are origin-0. */ 259 int *realindexes; 260 261 /* Total number of nondiscarded lines. */ 262 int nondiscarded_lines; 263 264 /* Vector, indexed by real origin-0 line number, 265 containing 1 for a line that is an insertion or a deletion. 266 The results of comparison are stored here. */ 267 char *changed_flag; 268 269 /* 1 if file ends in a line with no final newline. */ 270 int missing_newline; 271 272 /* 1 more than the maximum equivalence value used for this or its 273 sibling file. */ 274 int equiv_max; 275 }; 276 277 /* Describe the two files currently being compared. */ 278 279 EXTERN struct file_data files[2]; 280 281 /* Stdio stream to output diffs to. */ 283 284 EXTERN FILE *outfile; 285 286 /* Declare various functions. */ 288 289 /* analyze.c */ 290 int diff_2_files PARAMS((struct file_data[], int)); 291 292 /* context.c */ 293 void print_context_header PARAMS((struct file_data[], int)); 294 void print_context_script PARAMS((struct change *, int)); 295 296 /* diff.c */ 297 int excluded_filename PARAMS((char const *)); 298 299 /* dir.c */ 300 int diff_dirs PARAMS((struct file_data const[], int (*) PARAMS((char const *, char const *, char const *, char const *, int)), int)); 301 302 /* ed.c */ 303 void print_ed_script PARAMS((struct change *)); 304 void pr_forward_ed_script PARAMS((struct change *)); 305 306 /* ifdef.c */ 307 void print_ifdef_script PARAMS((struct change *)); 308 309 /* io.c */ 310 int read_files PARAMS((struct file_data[], int)); 311 int sip PARAMS((struct file_data *, int)); 312 void slurp PARAMS((struct file_data *)); 313 314 /* normal.c */ 315 void print_normal_script PARAMS((struct change *)); 316 317 /* rcs.c */ 318 void print_rcs_script PARAMS((struct change *)); 319 320 /* side.c */ 321 void print_sdiff_script PARAMS((struct change *)); 322 323 /* util.c */ 324 VOID *xmalloc PARAMS((size_t)); 325 VOID *xrealloc PARAMS((VOID *, size_t)); 326 char *concat PARAMS((char const *, char const *, char const *)); 327 char *dir_file_pathname PARAMS((char const *, char const *)); 328 int change_letter PARAMS((int, int)); 329 int line_cmp PARAMS((char const *, char const *)); 330 int translate_line_number PARAMS((struct file_data const *, int)); 331 struct change *find_change PARAMS((struct change *)); 332 struct change *find_reverse_change PARAMS((struct change *)); 333 void analyze_hunk PARAMS((struct change *, int *, int *, int *, int *, int *, int *)); 334 void begin_output PARAMS((void)); 335 void debug_script PARAMS((struct change *)); 336 void diff_error PARAMS((char const *, char const *, char const *)); 337 void fatal PARAMS((char const *)); 338 void finish_output PARAMS((void)); 339 void write_output PARAMS((char const *, size_t)); 340 void printf_output PARAMS((char const *, ...)) 341 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ > 6) 342 __attribute__ ((__format__ (__printf__, 1, 2))) 343 #endif 344 ; 345 void flush_output PARAMS((void)); 346 void message PARAMS((char const *, char const *, char const *)); 347 void message5 PARAMS((char const *, char const *, char const *, char const *, char const *)); 348 void output_1_line PARAMS((char const *, char const *, char const *, char const *)); 349 void perror_with_name PARAMS((char const *)); 350 void pfatal_with_name PARAMS((char const *)); 351 void print_1_line PARAMS((char const *, char const * const *)); 352 void print_message_queue PARAMS((void)); 353 void print_number_range PARAMS((int, struct file_data *, int, int)); 354 void print_script PARAMS((struct change *, struct change * (*) PARAMS((struct change *)), void (*) PARAMS((struct change *)))); 355 void setup_output PARAMS((char const *, char const *, int)); 356 void translate_range PARAMS((struct file_data const *, int, int, int *, int *)); 357 358 /* version.c */ 359 extern char const diff_version_string[]; 360
Indexes created Wed Jul 29 00:25:28 UTC 2026