1 74b37681 2019-02-07 stsp /*	$OpenBSD: diff3.c,v 1.41 2016/10/18 21:06:52 millert Exp $	*/
   2 74b37681 2019-02-07 stsp 
   3 74b37681 2019-02-07 stsp /*
   4 74b37681 2019-02-07 stsp  * Copyright (C) Caldera International Inc.  2001-2002.
   5 74b37681 2019-02-07 stsp  * All rights reserved.
   6 74b37681 2019-02-07 stsp  *
   7 74b37681 2019-02-07 stsp  * Redistribution and use in source and binary forms, with or without
   8 74b37681 2019-02-07 stsp  * modification, are permitted provided that the following conditions
   9 74b37681 2019-02-07 stsp  * are met:
  10 74b37681 2019-02-07 stsp  * 1. Redistributions of source code and documentation must retain the above
  11 74b37681 2019-02-07 stsp  *    copyright notice, this list of conditions and the following disclaimer.
  12 74b37681 2019-02-07 stsp  * 2. Redistributions in binary form must reproduce the above copyright
  13 74b37681 2019-02-07 stsp  *    notice, this list of conditions and the following disclaimer in the
  14 74b37681 2019-02-07 stsp  *    documentation and/or other materials provided with the distribution.
  15 74b37681 2019-02-07 stsp  * 3. All advertising materials mentioning features or use of this software
  16 74b37681 2019-02-07 stsp  *    must display the following acknowledgement:
  17 74b37681 2019-02-07 stsp  *	This product includes software developed or owned by Caldera
  18 74b37681 2019-02-07 stsp  *	International, Inc.
  19 74b37681 2019-02-07 stsp  * 4. Neither the name of Caldera International, Inc. nor the names of other
  20 74b37681 2019-02-07 stsp  *    contributors may be used to endorse or promote products derived from
  21 74b37681 2019-02-07 stsp  *    this software without specific prior written permission.
  22 74b37681 2019-02-07 stsp  *
  23 74b37681 2019-02-07 stsp  * USE OF THE SOFTWARE PROVIDED FOR UNDER THIS LICENSE BY CALDERA
  24 74b37681 2019-02-07 stsp  * INTERNATIONAL, INC. AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR
  25 74b37681 2019-02-07 stsp  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  26 74b37681 2019-02-07 stsp  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  27 74b37681 2019-02-07 stsp  * IN NO EVENT SHALL CALDERA INTERNATIONAL, INC. BE LIABLE FOR ANY DIRECT,
  28 74b37681 2019-02-07 stsp  * INDIRECT INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  29 74b37681 2019-02-07 stsp  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  30 74b37681 2019-02-07 stsp  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31 74b37681 2019-02-07 stsp  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  32 74b37681 2019-02-07 stsp  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  33 74b37681 2019-02-07 stsp  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  34 74b37681 2019-02-07 stsp  * POSSIBILITY OF SUCH DAMAGE.
  35 74b37681 2019-02-07 stsp  */
  36 74b37681 2019-02-07 stsp /*-
  37 74b37681 2019-02-07 stsp  * Copyright (c) 1991, 1993
  38 74b37681 2019-02-07 stsp  *	The Regents of the University of California.  All rights reserved.
  39 74b37681 2019-02-07 stsp  *
  40 74b37681 2019-02-07 stsp  * Redistribution and use in source and binary forms, with or without
  41 74b37681 2019-02-07 stsp  * modification, are permitted provided that the following conditions
  42 74b37681 2019-02-07 stsp  * are met:
  43 74b37681 2019-02-07 stsp  * 1. Redistributions of source code must retain the above copyright
  44 74b37681 2019-02-07 stsp  *    notice, this list of conditions and the following disclaimer.
  45 74b37681 2019-02-07 stsp  * 2. Redistributions in binary form must reproduce the above copyright
  46 74b37681 2019-02-07 stsp  *    notice, this list of conditions and the following disclaimer in the
  47 74b37681 2019-02-07 stsp  *    documentation and/or other materials provided with the distribution.
  48 74b37681 2019-02-07 stsp  * 3. Neither the name of the University nor the names of its contributors
  49 74b37681 2019-02-07 stsp  *    may be used to endorse or promote products derived from this software
  50 74b37681 2019-02-07 stsp  *    without specific prior written permission.
  51 74b37681 2019-02-07 stsp  *
  52 74b37681 2019-02-07 stsp  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  53 74b37681 2019-02-07 stsp  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  54 74b37681 2019-02-07 stsp  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  55 74b37681 2019-02-07 stsp  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  56 74b37681 2019-02-07 stsp  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  57 74b37681 2019-02-07 stsp  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  58 74b37681 2019-02-07 stsp  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  59 74b37681 2019-02-07 stsp  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  60 74b37681 2019-02-07 stsp  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  61 74b37681 2019-02-07 stsp  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  62 74b37681 2019-02-07 stsp  * SUCH DAMAGE.
  63 74b37681 2019-02-07 stsp  *
  64 74b37681 2019-02-07 stsp  *	@(#)diff3.c	8.1 (Berkeley) 6/6/93
  65 74b37681 2019-02-07 stsp  */
  66 74b37681 2019-02-07 stsp 
  67 c03c6cb3 2019-02-08 stsp #include <sys/stat.h>
  68 c03c6cb3 2019-02-08 stsp 
  69 74b37681 2019-02-07 stsp #include <ctype.h>
  70 c03c6cb3 2019-02-08 stsp #include <limits.h>
  71 74b37681 2019-02-07 stsp #include <stdio.h>
  72 c03c6cb3 2019-02-08 stsp #include <stdarg.h>
  73 74b37681 2019-02-07 stsp #include <stdlib.h>
  74 74b37681 2019-02-07 stsp #include <string.h>
  75 74b37681 2019-02-07 stsp #include <time.h>
  76 74b37681 2019-02-07 stsp #include <unistd.h>
  77 74b37681 2019-02-07 stsp 
  78 c03c6cb3 2019-02-08 stsp #include "got_error.h"
  79 c03c6cb3 2019-02-08 stsp #include "got_opentemp.h"
  80 c03c6cb3 2019-02-08 stsp #include "got_object.h"
  81 25ec7006 2022-07-01 thomas #include "got_diff.h"
  82 74b37681 2019-02-07 stsp 
  83 c03c6cb3 2019-02-08 stsp #include "buf.h"
  84 c03c6cb3 2019-02-08 stsp #include "rcsutil.h"
  85 c03c6cb3 2019-02-08 stsp #include "got_lib_diff.h"
  86 c03c6cb3 2019-02-08 stsp 
  87 0d26ce36 2019-02-08 stsp #ifndef nitems
  88 0d26ce36 2019-02-08 stsp #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
  89 0d26ce36 2019-02-08 stsp #endif
  90 c03c6cb3 2019-02-08 stsp 
  91 74b37681 2019-02-07 stsp /* diff3 - 3-way differential file comparison */
  92 74b37681 2019-02-07 stsp 
  93 74b37681 2019-02-07 stsp /* diff3 [-ex3EX] d13 d23 f1 f2 f3 [m1 m3]
  94 74b37681 2019-02-07 stsp  *
  95 74b37681 2019-02-07 stsp  * d13 = diff report on f1 vs f3
  96 74b37681 2019-02-07 stsp  * d23 = diff report on f2 vs f3
  97 74b37681 2019-02-07 stsp  * f1, f2, f3 the 3 files
  98 74b37681 2019-02-07 stsp  * if changes in f1 overlap with changes in f3, m1 and m3 are used
  99 74b37681 2019-02-07 stsp  * to mark the overlaps; otherwise, the file names f1 and f3 are used
 100 74b37681 2019-02-07 stsp  * (only for options E and X).
 101 74b37681 2019-02-07 stsp  */
 102 74b37681 2019-02-07 stsp 
 103 74b37681 2019-02-07 stsp /*
 104 74b37681 2019-02-07 stsp  * "from" is first in range of changed lines; "to" is last+1
 105 74b37681 2019-02-07 stsp  * from=to=line after point of insertion for added lines.
 106 74b37681 2019-02-07 stsp  */
 107 b2338eff 2019-10-09 stsp struct line_range {
 108 74b37681 2019-02-07 stsp 	int from;
 109 74b37681 2019-02-07 stsp 	int to;
 110 74b37681 2019-02-07 stsp };
 111 74b37681 2019-02-07 stsp 
 112 b2338eff 2019-10-09 stsp struct off_range {
 113 b2338eff 2019-10-09 stsp 	off_t from;
 114 b2338eff 2019-10-09 stsp 	off_t to;
 115 b2338eff 2019-10-09 stsp };
 116 b2338eff 2019-10-09 stsp 
 117 74b37681 2019-02-07 stsp struct diff {
 118 b2338eff 2019-10-09 stsp 	struct line_range old;
 119 b2338eff 2019-10-09 stsp 	struct line_range new;
 120 d136cfcb 2019-10-12 stsp 	struct off_range oldo;
 121 b2338eff 2019-10-09 stsp 	struct off_range newo;
 122 74b37681 2019-02-07 stsp };
 123 74b37681 2019-02-07 stsp 
 124 078e971d 2019-02-08 stsp struct diff3_state {
 125 078e971d 2019-02-08 stsp 	size_t szchanges;
 126 74b37681 2019-02-07 stsp 
 127 078e971d 2019-02-08 stsp 	struct diff *d13;
 128 078e971d 2019-02-08 stsp 	struct diff *d23;
 129 74b37681 2019-02-07 stsp 
 130 078e971d 2019-02-08 stsp 	/*
 131 078e971d 2019-02-08 stsp 	 * "de" is used to gather editing scripts.  These are later spewed out
 132 078e971d 2019-02-08 stsp 	 * in reverse order.  Its first element must be all zero, the "new"
 133 d136cfcb 2019-10-12 stsp 	 * component of "de" contains line positions, and "oldo" and "newo"
 134 d136cfcb 2019-10-12 stsp 	 * components contain byte positions.
 135 b2338eff 2019-10-09 stsp 	 * Array overlap indicates which sections in "de" correspond to lines
 136 b2338eff 2019-10-09 stsp 	 * that are different in all three files.
 137 078e971d 2019-02-08 stsp 	 */
 138 078e971d 2019-02-08 stsp 	struct diff *de;
 139 078e971d 2019-02-08 stsp 	char *overlap;
 140 078e971d 2019-02-08 stsp 	int overlapcnt;
 141 078e971d 2019-02-08 stsp 	FILE *fp[3];
 142 078e971d 2019-02-08 stsp 	int cline[3];		/* # of the last-read line in each file (0-2) */
 143 74b37681 2019-02-07 stsp 
 144 078e971d 2019-02-08 stsp 	/*
 145 078e971d 2019-02-08 stsp 	 * the latest known correspondence between line numbers of the 3 files
 146 078e971d 2019-02-08 stsp 	 * is stored in last[1-3];
 147 078e971d 2019-02-08 stsp 	 */
 148 078e971d 2019-02-08 stsp 	int last[4];
 149 f69721c3 2019-10-21 stsp 	char f1mark[PATH_MAX];
 150 f69721c3 2019-10-21 stsp 	char f2mark[PATH_MAX];
 151 f69721c3 2019-10-21 stsp 	char f3mark[PATH_MAX];
 152 dfc4f8fe 2019-02-08 stsp 
 153 dfc4f8fe 2019-02-08 stsp 	char *buf;
 154 5176f942 2019-02-08 stsp 
 155 5176f942 2019-02-08 stsp 	BUF *diffbuf;
 156 078e971d 2019-02-08 stsp };
 157 078e971d 2019-02-08 stsp 
 158 c03c6cb3 2019-02-08 stsp 
 159 d136cfcb 2019-10-12 stsp static const struct got_error *duplicate(int *, int, struct line_range *,
 160 b2338eff 2019-10-09 stsp     struct line_range *, struct diff3_state *);
 161 02b87977 2019-10-06 stsp static const struct got_error *edit(struct diff *, int, int *,
 162 02b87977 2019-10-06 stsp     struct diff3_state *);
 163 02b87977 2019-10-06 stsp static const struct got_error *getchange(char **, FILE *, struct diff3_state *);
 164 02b87977 2019-10-06 stsp static const struct got_error *get_line(char **, FILE *, size_t *,
 165 02b87977 2019-10-06 stsp     struct diff3_state *);
 166 74b37681 2019-02-07 stsp static int number(char **);
 167 b90524b1 2019-02-08 stsp static const struct got_error *readin(size_t *, char *, struct diff **,
 168 b90524b1 2019-02-08 stsp     struct diff3_state *);
 169 c03c6cb3 2019-02-08 stsp static int ed_patch_lines(struct rcs_lines *, struct rcs_lines *);
 170 88775814 2019-10-09 stsp static const struct got_error *skip(size_t *, int, int, struct diff3_state *);
 171 180dce26 2019-10-06 stsp static const struct got_error *edscript(int, struct diff3_state *);
 172 180dce26 2019-10-06 stsp static const struct got_error *merge(size_t, size_t, struct diff3_state *);
 173 48b4f239 2021-12-31 thomas static const struct got_error *prange(struct line_range *,
 174 48b4f239 2021-12-31 thomas     struct diff3_state *);
 175 f571bb85 2019-10-06 stsp static const struct got_error *repos(int, struct diff3_state *);
 176 078e971d 2019-02-08 stsp static const struct got_error *increase(struct diff3_state *);
 177 c03c6cb3 2019-02-08 stsp static const struct got_error *diff3_internal(char *, char *, char *,
 178 a551f215 2019-02-08 stsp     char *, char *, const char *, const char *, struct diff3_state *,
 179 f69721c3 2019-10-21 stsp     const char *, const char *, const char *);
 180 74b37681 2019-02-07 stsp 
 181 c03c6cb3 2019-02-08 stsp static const struct got_error *
 182 5176f942 2019-02-08 stsp diff_output(BUF *diffbuf, const char *fmt, ...)
 183 c03c6cb3 2019-02-08 stsp {
 184 346b301a 2019-10-06 stsp 	const struct got_error *err = NULL;
 185 c03c6cb3 2019-02-08 stsp 	va_list vap;
 186 c03c6cb3 2019-02-08 stsp 	int i;
 187 c03c6cb3 2019-02-08 stsp 	char *str;
 188 c03c6cb3 2019-02-08 stsp 	size_t newsize;
 189 c03c6cb3 2019-02-08 stsp 
 190 c03c6cb3 2019-02-08 stsp 	va_start(vap, fmt);
 191 c03c6cb3 2019-02-08 stsp 	i = vasprintf(&str, fmt, vap);
 192 c03c6cb3 2019-02-08 stsp 	va_end(vap);
 193 c03c6cb3 2019-02-08 stsp 	if (i == -1)
 194 638f9024 2019-05-13 stsp 		return got_error_from_errno("vasprintf");
 195 346b301a 2019-10-06 stsp 	err = buf_append(&newsize, diffbuf, str, strlen(str));
 196 c03c6cb3 2019-02-08 stsp 	free(str);
 197 346b301a 2019-10-06 stsp 	return err;
 198 c03c6cb3 2019-02-08 stsp }
 199 c03c6cb3 2019-02-08 stsp 
 200 c03c6cb3 2019-02-08 stsp static const struct got_error*
 201 fdf3c2d3 2021-06-17 stsp diffreg(BUF **d, const char *path1, const char *path2,
 202 fdf3c2d3 2021-06-17 stsp     enum got_diff_algorithm diff_algo)
 203 c03c6cb3 2019-02-08 stsp {
 204 c03c6cb3 2019-02-08 stsp 	const struct got_error *err = NULL;
 205 c03c6cb3 2019-02-08 stsp 	FILE *f1 = NULL, *f2 = NULL, *outfile = NULL;
 206 c03c6cb3 2019-02-08 stsp 	char *outpath = NULL;
 207 fe621944 2020-11-10 stsp 	struct got_diffreg_result *diffreg_result = NULL;
 208 c03c6cb3 2019-02-08 stsp 
 209 c03c6cb3 2019-02-08 stsp 	*d = NULL;
 210 c03c6cb3 2019-02-08 stsp 
 211 c56c5d8a 2021-12-31 thomas 	f1 = fopen(path1, "re");
 212 c03c6cb3 2019-02-08 stsp 	if (f1 == NULL) {
 213 638f9024 2019-05-13 stsp 		err = got_error_from_errno2("fopen", path1);
 214 c03c6cb3 2019-02-08 stsp 		goto done;
 215 c03c6cb3 2019-02-08 stsp 	}
 216 c56c5d8a 2021-12-31 thomas 	f2 = fopen(path2, "re");
 217 c03c6cb3 2019-02-08 stsp 	if (f1 == NULL) {
 218 638f9024 2019-05-13 stsp 		err = got_error_from_errno2("fopen", path2);
 219 c03c6cb3 2019-02-08 stsp 		goto done;
 220 c03c6cb3 2019-02-08 stsp 	}
 221 c03c6cb3 2019-02-08 stsp 
 222 bb63914a 2020-02-17 stsp 	err = got_opentemp_named(&outpath, &outfile,
 223 bb63914a 2020-02-17 stsp 	    GOT_TMPDIR_STR "/got-diffreg");
 224 c03c6cb3 2019-02-08 stsp 	if (err)
 225 c03c6cb3 2019-02-08 stsp 		goto done;
 226 c03c6cb3 2019-02-08 stsp 
 227 24f136e0 2021-11-20 thomas 	err = got_diffreg(&diffreg_result, f1, f2, diff_algo, 0, 0);
 228 fe621944 2020-11-10 stsp 	if (err)
 229 fe621944 2020-11-10 stsp 		goto done;
 230 24f136e0 2021-11-20 thomas 
 231 24f136e0 2021-11-20 thomas 	if (diffreg_result) {
 232 24f136e0 2021-11-20 thomas 		struct diff_result *diff_result = diffreg_result->result;
 233 24f136e0 2021-11-20 thomas 		int atomizer_flags = (diff_result->left->atomizer_flags |
 234 24f136e0 2021-11-20 thomas 		    diff_result->right->atomizer_flags);
 235 24f136e0 2021-11-20 thomas 		if ((atomizer_flags & DIFF_ATOMIZER_FOUND_BINARY_DATA)) {
 236 24f136e0 2021-11-20 thomas 			err = got_error(GOT_ERR_FILE_BINARY);
 237 24f136e0 2021-11-20 thomas 			goto done;
 238 24f136e0 2021-11-20 thomas 		}
 239 24f136e0 2021-11-20 thomas 	}
 240 c03c6cb3 2019-02-08 stsp 
 241 1cb46f00 2020-11-21 stsp 	err = got_diffreg_output(NULL, NULL, diffreg_result, 1, 1, "", "",
 242 fe621944 2020-11-10 stsp 	    GOT_DIFF_OUTPUT_EDSCRIPT, 0, outfile);
 243 c03c6cb3 2019-02-08 stsp 	if (err)
 244 c03c6cb3 2019-02-08 stsp 		goto done;
 245 c03c6cb3 2019-02-08 stsp 
 246 cbe7f848 2019-02-11 stsp 	if (fflush(outfile) != 0) {
 247 638f9024 2019-05-13 stsp 		err = got_error_from_errno2("fflush", outpath);
 248 db590691 2021-06-02 stsp 		goto done;
 249 db590691 2021-06-02 stsp 	}
 250 db590691 2021-06-02 stsp 	if (fseek(outfile, 0L, SEEK_SET) == -1) {
 251 db590691 2021-06-02 stsp 		err = got_ferror(outfile, GOT_ERR_IO);
 252 cbe7f848 2019-02-11 stsp 		goto done;
 253 cbe7f848 2019-02-11 stsp 	}
 254 a551f215 2019-02-08 stsp 
 255 db590691 2021-06-02 stsp 	err = buf_load(d, outfile);
 256 c03c6cb3 2019-02-08 stsp done:
 257 a551f215 2019-02-08 stsp 	if (outpath) {
 258 68bda3b1 2019-10-09 stsp 		if (unlink(outpath) == -1 && err == NULL)
 259 68bda3b1 2019-10-09 stsp 			err = got_error_from_errno2("unlink", outpath);
 260 a551f215 2019-02-08 stsp 		free(outpath);
 261 a551f215 2019-02-08 stsp 	}
 262 56b63ca4 2021-01-22 stsp 	if (outfile && fclose(outfile) == EOF && err == NULL)
 263 638f9024 2019-05-13 stsp 		err = got_error_from_errno("fclose");
 264 56b63ca4 2021-01-22 stsp 	if (f1 && fclose(f1) == EOF && err == NULL)
 265 638f9024 2019-05-13 stsp 		err = got_error_from_errno("fclose");
 266 56b63ca4 2021-01-22 stsp 	if (f2 && fclose(f2) == EOF && err == NULL)
 267 638f9024 2019-05-13 stsp 		err = got_error_from_errno("fclose");
 268 c03c6cb3 2019-02-08 stsp 	return err;
 269 c03c6cb3 2019-02-08 stsp }
 270 c03c6cb3 2019-02-08 stsp 
 271 74b37681 2019-02-07 stsp /*
 272 74b37681 2019-02-07 stsp  * For merge(1).
 273 74b37681 2019-02-07 stsp  */
 274 c03c6cb3 2019-02-08 stsp const struct got_error *
 275 db590691 2021-06-02 stsp got_merge_diff3(int *overlapcnt, int outfd, FILE *f1, FILE *f2,
 276 fdf3c2d3 2021-06-17 stsp     FILE *f3, const char *label1, const char *label2, const char *label3,
 277 fdf3c2d3 2021-06-17 stsp     enum got_diff_algorithm diff_algo)
 278 74b37681 2019-02-07 stsp {
 279 c03c6cb3 2019-02-08 stsp 	const struct got_error *err = NULL;
 280 c03c6cb3 2019-02-08 stsp 	char *dp13, *dp23, *path1, *path2, *path3;
 281 74b37681 2019-02-07 stsp 	BUF *b1, *b2, *b3, *d1, *d2, *diffb;
 282 74b37681 2019-02-07 stsp 	u_char *data, *patch;
 283 16aeacf7 2020-11-26 stsp 	size_t dlen, plen, i;
 284 078e971d 2019-02-08 stsp 	struct diff3_state *d3s;
 285 5d731149 2019-02-08 stsp 
 286 57ee5d50 2019-02-08 stsp 	*overlapcnt = 0;
 287 74b37681 2019-02-07 stsp 
 288 078e971d 2019-02-08 stsp 	d3s = calloc(1, sizeof(*d3s));
 289 078e971d 2019-02-08 stsp 	if (d3s == NULL)
 290 638f9024 2019-05-13 stsp 		return got_error_from_errno("calloc");
 291 078e971d 2019-02-08 stsp 
 292 74b37681 2019-02-07 stsp 	b1 = b2 = b3 = d1 = d2 = diffb = NULL;
 293 74b37681 2019-02-07 stsp 	dp13 = dp23 = path1 = path2 = path3 = NULL;
 294 74b37681 2019-02-07 stsp 	data = patch = NULL;
 295 74b37681 2019-02-07 stsp 
 296 db590691 2021-06-02 stsp 	err = buf_load(&b1, f1);
 297 575e8218 2019-10-07 stsp 	if (err)
 298 74b37681 2019-02-07 stsp 		goto out;
 299 db590691 2021-06-02 stsp 	err = buf_load(&b2, f2);
 300 575e8218 2019-10-07 stsp 	if (err)
 301 74b37681 2019-02-07 stsp 		goto out;
 302 db590691 2021-06-02 stsp 	err = buf_load(&b3, f3);
 303 575e8218 2019-10-07 stsp 	if (err)
 304 575e8218 2019-10-07 stsp 		goto out;
 305 74b37681 2019-02-07 stsp 
 306 575e8218 2019-10-07 stsp 	err = buf_alloc(&diffb, 128);
 307 575e8218 2019-10-07 stsp 	if (err)
 308 575e8218 2019-10-07 stsp 		goto out;
 309 74b37681 2019-02-07 stsp 
 310 bb63914a 2020-02-17 stsp 	if (asprintf(&path1, GOT_TMPDIR_STR "/got-diff1.XXXXXXXX") == -1) {
 311 638f9024 2019-05-13 stsp 		err = got_error_from_errno("asprintf");
 312 74b37681 2019-02-07 stsp 		goto out;
 313 74b37681 2019-02-07 stsp 	}
 314 bb63914a 2020-02-17 stsp 	if (asprintf(&path2, GOT_TMPDIR_STR "/got-diff2.XXXXXXXX") == -1) {
 315 638f9024 2019-05-13 stsp 		err = got_error_from_errno("asprintf");
 316 74b37681 2019-02-07 stsp 		goto out;
 317 74b37681 2019-02-07 stsp 	}
 318 bb63914a 2020-02-17 stsp 	if (asprintf(&path3, GOT_TMPDIR_STR "/got-diff3.XXXXXXXX") == -1) {
 319 638f9024 2019-05-13 stsp 		err = got_error_from_errno("asprintf");
 320 74b37681 2019-02-07 stsp 		goto out;
 321 c03c6cb3 2019-02-08 stsp 	}
 322 74b37681 2019-02-07 stsp 
 323 96cbb597 2019-10-09 stsp 	err = buf_write_stmp(b1, path1);
 324 c03c6cb3 2019-02-08 stsp 	if (err)
 325 74b37681 2019-02-07 stsp 		goto out;
 326 96cbb597 2019-10-09 stsp 	err = buf_write_stmp(b2, path2);
 327 c03c6cb3 2019-02-08 stsp 	if (err)
 328 74b37681 2019-02-07 stsp 		goto out;
 329 96cbb597 2019-10-09 stsp 	err = buf_write_stmp(b3, path3);
 330 c03c6cb3 2019-02-08 stsp 	if (err)
 331 74b37681 2019-02-07 stsp 		goto out;
 332 74b37681 2019-02-07 stsp 
 333 74b37681 2019-02-07 stsp 	buf_free(b2);
 334 74b37681 2019-02-07 stsp 	b2 = NULL;
 335 74b37681 2019-02-07 stsp 
 336 fdf3c2d3 2021-06-17 stsp 	err = diffreg(&d1, path1, path3, diff_algo);
 337 c03c6cb3 2019-02-08 stsp 	if (err) {
 338 74b37681 2019-02-07 stsp 		buf_free(diffb);
 339 74b37681 2019-02-07 stsp 		diffb = NULL;
 340 74b37681 2019-02-07 stsp 		goto out;
 341 c03c6cb3 2019-02-08 stsp 
 342 74b37681 2019-02-07 stsp 	}
 343 fdf3c2d3 2021-06-17 stsp 	err = diffreg(&d2, path2, path3, diff_algo);
 344 c03c6cb3 2019-02-08 stsp 	if (err) {
 345 c03c6cb3 2019-02-08 stsp 		buf_free(diffb);
 346 c03c6cb3 2019-02-08 stsp 		diffb = NULL;
 347 c03c6cb3 2019-02-08 stsp 		goto out;
 348 c03c6cb3 2019-02-08 stsp 	}
 349 74b37681 2019-02-07 stsp 
 350 bb63914a 2020-02-17 stsp 	if (asprintf(&dp13, GOT_TMPDIR_STR "/got-d13.XXXXXXXXXX") == -1) {
 351 638f9024 2019-05-13 stsp 		err = got_error_from_errno("asprintf");
 352 c03c6cb3 2019-02-08 stsp 		goto out;
 353 c03c6cb3 2019-02-08 stsp 	}
 354 96cbb597 2019-10-09 stsp 	err = buf_write_stmp(d1, dp13);
 355 c03c6cb3 2019-02-08 stsp 	if (err)
 356 c03c6cb3 2019-02-08 stsp 		goto out;
 357 74b37681 2019-02-07 stsp 
 358 74b37681 2019-02-07 stsp 	buf_free(d1);
 359 74b37681 2019-02-07 stsp 	d1 = NULL;
 360 74b37681 2019-02-07 stsp 
 361 bb63914a 2020-02-17 stsp 	if (asprintf(&dp23, GOT_TMPDIR_STR "/got-d23.XXXXXXXXXX") == -1) {
 362 638f9024 2019-05-13 stsp 		err = got_error_from_errno("asprintf");
 363 c03c6cb3 2019-02-08 stsp 		goto out;
 364 c03c6cb3 2019-02-08 stsp 	}
 365 96cbb597 2019-10-09 stsp 	err = buf_write_stmp(d2, dp23);
 366 c03c6cb3 2019-02-08 stsp 	if (err)
 367 c03c6cb3 2019-02-08 stsp 		goto out;
 368 74b37681 2019-02-07 stsp 
 369 74b37681 2019-02-07 stsp 	buf_free(d2);
 370 74b37681 2019-02-07 stsp 	d2 = NULL;
 371 74b37681 2019-02-07 stsp 
 372 5176f942 2019-02-08 stsp 	d3s->diffbuf = diffb;
 373 a551f215 2019-02-08 stsp 	err = diff3_internal(dp13, dp23, path1, path2, path3,
 374 f69721c3 2019-10-21 stsp 	    label1, label3, d3s, label1, label2, label3);
 375 c03c6cb3 2019-02-08 stsp 	if (err) {
 376 74b37681 2019-02-07 stsp 		buf_free(diffb);
 377 74b37681 2019-02-07 stsp 		diffb = NULL;
 378 74b37681 2019-02-07 stsp 		goto out;
 379 74b37681 2019-02-07 stsp 	}
 380 74b37681 2019-02-07 stsp 
 381 74b37681 2019-02-07 stsp 	plen = buf_len(diffb);
 382 74b37681 2019-02-07 stsp 	patch = buf_release(diffb);
 383 74b37681 2019-02-07 stsp 	dlen = buf_len(b1);
 384 74b37681 2019-02-07 stsp 	data = buf_release(b1);
 385 74b37681 2019-02-07 stsp 
 386 5a3ad9e0 2019-02-08 stsp 	diffb = rcs_patchfile(data, dlen, patch, plen, ed_patch_lines);
 387 74b37681 2019-02-07 stsp out:
 388 74b37681 2019-02-07 stsp 	buf_free(b2);
 389 74b37681 2019-02-07 stsp 	buf_free(b3);
 390 74b37681 2019-02-07 stsp 	buf_free(d1);
 391 74b37681 2019-02-07 stsp 	buf_free(d2);
 392 74b37681 2019-02-07 stsp 
 393 68bda3b1 2019-10-09 stsp 	if (unlink(path1) == -1 && err == NULL)
 394 68bda3b1 2019-10-09 stsp 		err = got_error_from_errno2("unlink", path1);
 395 68bda3b1 2019-10-09 stsp 	if (unlink(path2) == -1 && err == NULL)
 396 68bda3b1 2019-10-09 stsp 		err = got_error_from_errno2("unlink", path2);
 397 68bda3b1 2019-10-09 stsp 	if (unlink(path3) == -1 && err == NULL)
 398 68bda3b1 2019-10-09 stsp 		err = got_error_from_errno2("unlink", path3);
 399 68bda3b1 2019-10-09 stsp 	if (unlink(dp13) == -1 && err == NULL)
 400 68bda3b1 2019-10-09 stsp 		err = got_error_from_errno2("unlink", dp13);
 401 68bda3b1 2019-10-09 stsp 	if (unlink(dp23) == -1 && err == NULL)
 402 68bda3b1 2019-10-09 stsp 		err = got_error_from_errno2("unlink", dp23);
 403 74b37681 2019-02-07 stsp 
 404 74b37681 2019-02-07 stsp 	free(path1);
 405 74b37681 2019-02-07 stsp 	free(path2);
 406 74b37681 2019-02-07 stsp 	free(path3);
 407 74b37681 2019-02-07 stsp 	free(dp13);
 408 74b37681 2019-02-07 stsp 	free(dp23);
 409 74b37681 2019-02-07 stsp 	free(data);
 410 74b37681 2019-02-07 stsp 	free(patch);
 411 c03c6cb3 2019-02-08 stsp 
 412 0d26ce36 2019-02-08 stsp 	for (i = 0; i < nitems(d3s->fp); i++) {
 413 56b63ca4 2021-01-22 stsp 		if (d3s->fp[i] && fclose(d3s->fp[i]) == EOF && err == NULL)
 414 638f9024 2019-05-13 stsp 			err = got_error_from_errno("fclose");
 415 0d26ce36 2019-02-08 stsp 	}
 416 5a3ad9e0 2019-02-08 stsp 	if (err == NULL && diffb) {
 417 62f59172 2019-02-08 stsp 		if (buf_write_fd(diffb, outfd) < 0)
 418 638f9024 2019-05-13 stsp 			err = got_error_from_errno("buf_write_fd");
 419 57ee5d50 2019-02-08 stsp 		*overlapcnt = d3s->overlapcnt;
 420 62f59172 2019-02-08 stsp 	}
 421 57ee5d50 2019-02-08 stsp 	free(d3s);
 422 62f59172 2019-02-08 stsp 	buf_free(diffb);
 423 c03c6cb3 2019-02-08 stsp 	return err;
 424 74b37681 2019-02-07 stsp }
 425 74b37681 2019-02-07 stsp 
 426 c03c6cb3 2019-02-08 stsp static const struct got_error *
 427 c03c6cb3 2019-02-08 stsp diff3_internal(char *dp13, char *dp23, char *path1, char *path2, char *path3,
 428 a551f215 2019-02-08 stsp     const char *fmark, const char *rmark, struct diff3_state *d3s,
 429 f69721c3 2019-10-21 stsp     const char *label1, const char *label2, const char *label3)
 430 74b37681 2019-02-07 stsp {
 431 c03c6cb3 2019-02-08 stsp 	const struct got_error *err = NULL;
 432 74b37681 2019-02-07 stsp 	ssize_t m, n;
 433 74b37681 2019-02-07 stsp 	int i;
 434 74b37681 2019-02-07 stsp 
 435 01a44956 2019-03-27 stsp 	i = snprintf(d3s->f1mark, sizeof(d3s->f1mark),
 436 f69721c3 2019-10-21 stsp 	    "%s%s%s", GOT_DIFF_CONFLICT_MARKER_BEGIN,
 437 f69721c3 2019-10-21 stsp 	    label1 ? " " : "", label1 ? label1 : "");
 438 078e971d 2019-02-08 stsp 	if (i < 0 || i >= (int)sizeof(d3s->f1mark))
 439 c03c6cb3 2019-02-08 stsp 		return got_error(GOT_ERR_NO_SPACE);
 440 74b37681 2019-02-07 stsp 
 441 f69721c3 2019-10-21 stsp 	i = snprintf(d3s->f2mark, sizeof(d3s->f2mark),
 442 f69721c3 2019-10-21 stsp 	    "%s%s%s", GOT_DIFF_CONFLICT_MARKER_ORIG,
 443 f69721c3 2019-10-21 stsp 	    label2 ? " " : "", label2 ? label2 : "");
 444 f69721c3 2019-10-21 stsp 	if (i < 0 || i >= (int)sizeof(d3s->f2mark))
 445 f69721c3 2019-10-21 stsp 		return got_error(GOT_ERR_NO_SPACE);
 446 f69721c3 2019-10-21 stsp 
 447 01a44956 2019-03-27 stsp 	i = snprintf(d3s->f3mark, sizeof(d3s->f3mark),
 448 f69721c3 2019-10-21 stsp 	    "%s%s%s", GOT_DIFF_CONFLICT_MARKER_END,
 449 f69721c3 2019-10-21 stsp 	    label3 ? " " : "", label3 ? label3 : "");
 450 078e971d 2019-02-08 stsp 	if (i < 0 || i >= (int)sizeof(d3s->f3mark))
 451 c03c6cb3 2019-02-08 stsp 		return got_error(GOT_ERR_NO_SPACE);
 452 74b37681 2019-02-07 stsp 
 453 078e971d 2019-02-08 stsp 	err = increase(d3s);
 454 c03c6cb3 2019-02-08 stsp 	if (err)
 455 c03c6cb3 2019-02-08 stsp 		return err;
 456 b90524b1 2019-02-08 stsp 
 457 b90524b1 2019-02-08 stsp 	err = readin(&m, dp13, &d3s->d13, d3s);
 458 b90524b1 2019-02-08 stsp 	if (err)
 459 b90524b1 2019-02-08 stsp 		return err;
 460 b90524b1 2019-02-08 stsp 	err = readin(&n, dp23, &d3s->d23, d3s);
 461 b90524b1 2019-02-08 stsp 	if (err)
 462 b90524b1 2019-02-08 stsp 		return err;
 463 74b37681 2019-02-07 stsp 
 464 c56c5d8a 2021-12-31 thomas 	if ((d3s->fp[0] = fopen(path1, "re")) == NULL)
 465 c56c5d8a 2021-12-31 thomas 		return got_error_from_errno2("fopen", path1);
 466 c56c5d8a 2021-12-31 thomas 	if ((d3s->fp[1] = fopen(path2, "re")) == NULL)
 467 638f9024 2019-05-13 stsp 		return got_error_from_errno2("fopen", path2);
 468 c56c5d8a 2021-12-31 thomas 	if ((d3s->fp[2] = fopen(path3, "re")) == NULL)
 469 638f9024 2019-05-13 stsp 		return got_error_from_errno2("fopen", path3);
 470 74b37681 2019-02-07 stsp 
 471 180dce26 2019-10-06 stsp 	return merge(m, n, d3s);
 472 74b37681 2019-02-07 stsp }
 473 74b37681 2019-02-07 stsp 
 474 c03c6cb3 2019-02-08 stsp static int
 475 74b37681 2019-02-07 stsp ed_patch_lines(struct rcs_lines *dlines, struct rcs_lines *plines)
 476 74b37681 2019-02-07 stsp {
 477 74b37681 2019-02-07 stsp 	char op, *ep;
 478 74b37681 2019-02-07 stsp 	struct rcs_line *sort, *lp, *dlp, *ndlp, *insert_after;
 479 74b37681 2019-02-07 stsp 	int start, end, i, lineno;
 480 74b37681 2019-02-07 stsp 	u_char tmp;
 481 74b37681 2019-02-07 stsp 
 482 74b37681 2019-02-07 stsp 	dlp = TAILQ_FIRST(&(dlines->l_lines));
 483 74b37681 2019-02-07 stsp 	lp = TAILQ_FIRST(&(plines->l_lines));
 484 74b37681 2019-02-07 stsp 
 485 74b37681 2019-02-07 stsp 	end = 0;
 486 74b37681 2019-02-07 stsp 	for (lp = TAILQ_NEXT(lp, l_list); lp != NULL;
 487 74b37681 2019-02-07 stsp 	    lp = TAILQ_NEXT(lp, l_list)) {
 488 74b37681 2019-02-07 stsp 		/* Skip blank lines */
 489 74b37681 2019-02-07 stsp 		if (lp->l_len < 2)
 490 74b37681 2019-02-07 stsp 			continue;
 491 74b37681 2019-02-07 stsp 
 492 74b37681 2019-02-07 stsp 		/* NUL-terminate line buffer for strtol() safety. */
 493 74b37681 2019-02-07 stsp 		tmp = lp->l_line[lp->l_len - 1];
 494 74b37681 2019-02-07 stsp 		lp->l_line[lp->l_len - 1] = '\0';
 495 74b37681 2019-02-07 stsp 
 496 74b37681 2019-02-07 stsp 		/* len - 1 is NUL terminator so we use len - 2 for 'op' */
 497 74b37681 2019-02-07 stsp 		op = lp->l_line[lp->l_len - 2];
 498 74b37681 2019-02-07 stsp 		start = (int)strtol(lp->l_line, &ep, 10);
 499 74b37681 2019-02-07 stsp 
 500 74b37681 2019-02-07 stsp 		/* Restore the last byte of the buffer */
 501 74b37681 2019-02-07 stsp 		lp->l_line[lp->l_len - 1] = tmp;
 502 74b37681 2019-02-07 stsp 
 503 74b37681 2019-02-07 stsp 		if (op == 'a') {
 504 74b37681 2019-02-07 stsp 			if (start > dlines->l_nblines ||
 505 74b37681 2019-02-07 stsp 			    start < 0 || *ep != 'a')
 506 c03c6cb3 2019-02-08 stsp 				return -1;
 507 74b37681 2019-02-07 stsp 		} else if (op == 'c') {
 508 74b37681 2019-02-07 stsp 			if (start > dlines->l_nblines ||
 509 74b37681 2019-02-07 stsp 			    start < 0 || (*ep != ',' && *ep != 'c'))
 510 c03c6cb3 2019-02-08 stsp 				return -1;
 511 74b37681 2019-02-07 stsp 
 512 74b37681 2019-02-07 stsp 			if (*ep == ',') {
 513 74b37681 2019-02-07 stsp 				ep++;
 514 74b37681 2019-02-07 stsp 				end = (int)strtol(ep, &ep, 10);
 515 74b37681 2019-02-07 stsp 				if (end < 0 || *ep != 'c')
 516 c03c6cb3 2019-02-08 stsp 					return -1;
 517 74b37681 2019-02-07 stsp 			} else {
 518 74b37681 2019-02-07 stsp 				end = start;
 519 74b37681 2019-02-07 stsp 			}
 520 74b37681 2019-02-07 stsp 		}
 521 74b37681 2019-02-07 stsp 
 522 74b37681 2019-02-07 stsp 
 523 74b37681 2019-02-07 stsp 		for (;;) {
 524 74b37681 2019-02-07 stsp 			if (dlp == NULL)
 525 74b37681 2019-02-07 stsp 				break;
 526 74b37681 2019-02-07 stsp 			if (dlp->l_lineno == start)
 527 74b37681 2019-02-07 stsp 				break;
 528 74b37681 2019-02-07 stsp 			if (dlp->l_lineno > start) {
 529 74b37681 2019-02-07 stsp 				dlp = TAILQ_PREV(dlp, tqh, l_list);
 530 74b37681 2019-02-07 stsp 			} else if (dlp->l_lineno < start) {
 531 74b37681 2019-02-07 stsp 				ndlp = TAILQ_NEXT(dlp, l_list);
 532 74b37681 2019-02-07 stsp 				if (ndlp->l_lineno > start)
 533 74b37681 2019-02-07 stsp 					break;
 534 74b37681 2019-02-07 stsp 				dlp = ndlp;
 535 74b37681 2019-02-07 stsp 			}
 536 74b37681 2019-02-07 stsp 		}
 537 74b37681 2019-02-07 stsp 
 538 74b37681 2019-02-07 stsp 		if (dlp == NULL)
 539 c03c6cb3 2019-02-08 stsp 			return -1;
 540 74b37681 2019-02-07 stsp 
 541 74b37681 2019-02-07 stsp 
 542 74b37681 2019-02-07 stsp 		if (op == 'c') {
 543 74b37681 2019-02-07 stsp 			insert_after = TAILQ_PREV(dlp, tqh, l_list);
 544 74b37681 2019-02-07 stsp 			for (i = 0; i <= (end - start); i++) {
 545 74b37681 2019-02-07 stsp 				ndlp = TAILQ_NEXT(dlp, l_list);
 546 74b37681 2019-02-07 stsp 				TAILQ_REMOVE(&(dlines->l_lines), dlp, l_list);
 547 74b37681 2019-02-07 stsp 				dlp = ndlp;
 548 74b37681 2019-02-07 stsp 			}
 549 74b37681 2019-02-07 stsp 			dlp = insert_after;
 550 74b37681 2019-02-07 stsp 		}
 551 74b37681 2019-02-07 stsp 
 552 74b37681 2019-02-07 stsp 		if (op == 'a' || op == 'c') {
 553 74b37681 2019-02-07 stsp 			for (;;) {
 554 74b37681 2019-02-07 stsp 				ndlp = lp;
 555 74b37681 2019-02-07 stsp 				lp = TAILQ_NEXT(lp, l_list);
 556 74b37681 2019-02-07 stsp 				if (lp == NULL)
 557 c03c6cb3 2019-02-08 stsp 					return -1;
 558 74b37681 2019-02-07 stsp 
 559 acb4e1d1 2019-08-10 stsp 				if (lp->l_len == 2 &&
 560 acb4e1d1 2019-08-10 stsp 				    lp->l_line[0] == '.' &&
 561 acb4e1d1 2019-08-10 stsp 				    lp->l_line[1] == '\n')
 562 74b37681 2019-02-07 stsp 					break;
 563 74b37681 2019-02-07 stsp 
 564 461f6aed 2021-10-12 thomas 				if (lp->l_line[0] == ':') {
 565 461f6aed 2021-10-12 thomas 					lp->l_line++;
 566 461f6aed 2021-10-12 thomas 					lp->l_len--;
 567 461f6aed 2021-10-12 thomas 				}
 568 74b37681 2019-02-07 stsp 				TAILQ_REMOVE(&(plines->l_lines), lp, l_list);
 569 74b37681 2019-02-07 stsp 				TAILQ_INSERT_AFTER(&(dlines->l_lines), dlp,
 570 74b37681 2019-02-07 stsp 				    lp, l_list);
 571 74b37681 2019-02-07 stsp 				dlp = lp;
 572 74b37681 2019-02-07 stsp 
 573 74b37681 2019-02-07 stsp 				lp->l_lineno = start;
 574 74b37681 2019-02-07 stsp 				lp = ndlp;
 575 74b37681 2019-02-07 stsp 			}
 576 74b37681 2019-02-07 stsp 		}
 577 74b37681 2019-02-07 stsp 
 578 74b37681 2019-02-07 stsp 		/*
 579 74b37681 2019-02-07 stsp 		 * always resort lines as the markers might be put at the
 580 74b37681 2019-02-07 stsp 		 * same line as we first started editing.
 581 74b37681 2019-02-07 stsp 		 */
 582 74b37681 2019-02-07 stsp 		lineno = 0;
 583 74b37681 2019-02-07 stsp 		TAILQ_FOREACH(sort, &(dlines->l_lines), l_list)
 584 74b37681 2019-02-07 stsp 			sort->l_lineno = lineno++;
 585 74b37681 2019-02-07 stsp 		dlines->l_nblines = lineno - 1;
 586 74b37681 2019-02-07 stsp 	}
 587 74b37681 2019-02-07 stsp 
 588 74b37681 2019-02-07 stsp 	return (0);
 589 74b37681 2019-02-07 stsp }
 590 74b37681 2019-02-07 stsp 
 591 74b37681 2019-02-07 stsp /*
 592 74b37681 2019-02-07 stsp  * Pick up the line numbers of all changes from one change file.
 593 74b37681 2019-02-07 stsp  * (This puts the numbers in a vector, which is not strictly necessary,
 594 74b37681 2019-02-07 stsp  * since the vector is processed in one sequential pass.
 595 74b37681 2019-02-07 stsp  * The vector could be optimized out of existence)
 596 74b37681 2019-02-07 stsp  */
 597 b90524b1 2019-02-08 stsp static const struct got_error *
 598 b90524b1 2019-02-08 stsp readin(size_t *n, char *name, struct diff **dd, struct diff3_state *d3s)
 599 74b37681 2019-02-07 stsp {
 600 b90524b1 2019-02-08 stsp 	const struct got_error *err = NULL;
 601 971405a7 2019-10-09 stsp 	FILE *f;
 602 74b37681 2019-02-07 stsp 	int a, b, c, d;
 603 74b37681 2019-02-07 stsp 	char kind, *p;
 604 937e0e58 2019-10-21 stsp 	size_t i = 0;
 605 abc6a33f 2019-02-08 stsp 
 606 abc6a33f 2019-02-08 stsp 	*n = 0;
 607 74b37681 2019-02-07 stsp 
 608 c56c5d8a 2021-12-31 thomas 	f = fopen(name, "re");
 609 971405a7 2019-10-09 stsp 	if (f == NULL)
 610 638f9024 2019-05-13 stsp 		return got_error_from_errno2("fopen", name);
 611 971405a7 2019-10-09 stsp 	err = getchange(&p, f, d3s);
 612 02b87977 2019-10-06 stsp 	if (err)
 613 e4531130 2019-10-09 stsp 		goto done;
 614 02b87977 2019-10-06 stsp 	for (i = 0; p; i++) {
 615 b90524b1 2019-02-08 stsp 		if (i >= d3s->szchanges - 1) {
 616 b90524b1 2019-02-08 stsp 			err = increase(d3s);
 617 b90524b1 2019-02-08 stsp 			if (err)
 618 e4531130 2019-10-09 stsp 				goto done;
 619 b90524b1 2019-02-08 stsp 		}
 620 74b37681 2019-02-07 stsp 		a = b = number(&p);
 621 74b37681 2019-02-07 stsp 		if (*p == ',') {
 622 74b37681 2019-02-07 stsp 			p++;
 623 74b37681 2019-02-07 stsp 			b = number(&p);
 624 74b37681 2019-02-07 stsp 		}
 625 74b37681 2019-02-07 stsp 		kind = *p++;
 626 74b37681 2019-02-07 stsp 		c = d = number(&p);
 627 e19660d5 2019-10-06 stsp 		if (*p == ',') {
 628 74b37681 2019-02-07 stsp 			p++;
 629 74b37681 2019-02-07 stsp 			d = number(&p);
 630 74b37681 2019-02-07 stsp 		}
 631 74b37681 2019-02-07 stsp 		if (kind == 'a')
 632 74b37681 2019-02-07 stsp 			a++;
 633 74b37681 2019-02-07 stsp 		if (kind == 'd')
 634 74b37681 2019-02-07 stsp 			c++;
 635 74b37681 2019-02-07 stsp 		b++;
 636 74b37681 2019-02-07 stsp 		d++;
 637 74b37681 2019-02-07 stsp 		(*dd)[i].old.from = a;
 638 74b37681 2019-02-07 stsp 		(*dd)[i].old.to = b;
 639 74b37681 2019-02-07 stsp 		(*dd)[i].new.from = c;
 640 74b37681 2019-02-07 stsp 		(*dd)[i].new.to = d;
 641 02b87977 2019-10-06 stsp 
 642 971405a7 2019-10-09 stsp 		err = getchange(&p, f, d3s);
 643 02b87977 2019-10-06 stsp 		if (err)
 644 e4531130 2019-10-09 stsp 			goto done;
 645 74b37681 2019-02-07 stsp 	}
 646 74b37681 2019-02-07 stsp 
 647 74b37681 2019-02-07 stsp 	if (i) {
 648 e19660d5 2019-10-06 stsp 		(*dd)[i].old.from = (*dd)[i - 1].old.to;
 649 e19660d5 2019-10-06 stsp 		(*dd)[i].new.from = (*dd)[i - 1].new.to;
 650 74b37681 2019-02-07 stsp 	}
 651 e4531130 2019-10-09 stsp done:
 652 56b63ca4 2021-01-22 stsp 	if (fclose(f) == EOF && err == NULL)
 653 638f9024 2019-05-13 stsp 		err = got_error_from_errno("fclose");
 654 e4531130 2019-10-09 stsp 	if (err == NULL)
 655 e4531130 2019-10-09 stsp 		*n = i;
 656 fb43ecf1 2019-02-11 stsp 	return err;
 657 74b37681 2019-02-07 stsp }
 658 74b37681 2019-02-07 stsp 
 659 74b37681 2019-02-07 stsp static int
 660 74b37681 2019-02-07 stsp number(char **lc)
 661 74b37681 2019-02-07 stsp {
 662 74b37681 2019-02-07 stsp 	int nn;
 663 74b37681 2019-02-07 stsp 
 664 74b37681 2019-02-07 stsp 	nn = 0;
 665 74b37681 2019-02-07 stsp 	while (isdigit((unsigned char)(**lc)))
 666 74b37681 2019-02-07 stsp 		nn = nn*10 + *(*lc)++ - '0';
 667 74b37681 2019-02-07 stsp 
 668 74b37681 2019-02-07 stsp 	return (nn);
 669 74b37681 2019-02-07 stsp }
 670 74b37681 2019-02-07 stsp 
 671 02b87977 2019-10-06 stsp static const struct got_error *
 672 02b87977 2019-10-06 stsp getchange(char **line, FILE *b, struct diff3_state *d3s)
 673 74b37681 2019-02-07 stsp {
 674 02b87977 2019-10-06 stsp 	const struct got_error *err = NULL;
 675 74b37681 2019-02-07 stsp 
 676 02b87977 2019-10-06 stsp 	*line = NULL;
 677 02b87977 2019-10-06 stsp 	do {
 678 02b87977 2019-10-06 stsp 		if (*line && isdigit((unsigned char)(*line)[0]))
 679 02b87977 2019-10-06 stsp 			return NULL;
 680 02b87977 2019-10-06 stsp 		err = get_line(line, b, NULL, d3s);
 681 02b87977 2019-10-06 stsp 		if (err)
 682 02b87977 2019-10-06 stsp 			return err;
 683 02b87977 2019-10-06 stsp 	} while (*line);
 684 74b37681 2019-02-07 stsp 
 685 02b87977 2019-10-06 stsp 	return NULL;
 686 74b37681 2019-02-07 stsp }
 687 74b37681 2019-02-07 stsp 
 688 02b87977 2019-10-06 stsp static const struct got_error *
 689 02b87977 2019-10-06 stsp get_line(char **ret, FILE *b, size_t *n, struct diff3_state *d3s)
 690 74b37681 2019-02-07 stsp {
 691 02b87977 2019-10-06 stsp 	const struct got_error *err = NULL;
 692 6dea73df 2019-09-23 stsp 	char *cp = NULL;
 693 500467ff 2019-09-25 hiltjo 	size_t size;
 694 500467ff 2019-09-25 hiltjo 	ssize_t len;
 695 c03c6cb3 2019-02-08 stsp 	char *new;
 696 74b37681 2019-02-07 stsp 
 697 02b87977 2019-10-06 stsp 	*ret = NULL;
 698 8e831ff1 2021-10-17 thomas 	if (n != NULL)
 699 8e831ff1 2021-10-17 thomas 		*n = 0;
 700 02b87977 2019-10-06 stsp 
 701 6dea73df 2019-09-23 stsp 	len = getline(&cp, &size, b);
 702 02b87977 2019-10-06 stsp 	if (len == -1) {
 703 02b87977 2019-10-06 stsp 		if (ferror(b))
 704 02b87977 2019-10-06 stsp 			err = got_error_from_errno("getline");
 705 6dea73df 2019-09-23 stsp 		goto done;
 706 02b87977 2019-10-06 stsp 	}
 707 74b37681 2019-02-07 stsp 
 708 6dea73df 2019-09-23 stsp 	if (cp[len - 1] != '\n') {
 709 74b37681 2019-02-07 stsp 		len++;
 710 6dea73df 2019-09-23 stsp 		if (len + 1 > size) {
 711 6dea73df 2019-09-23 stsp 			new = realloc(cp, len + 1);
 712 02b87977 2019-10-06 stsp 			if (new == NULL) {
 713 02b87977 2019-10-06 stsp 				err = got_error_from_errno("realloc");
 714 6dea73df 2019-09-23 stsp 				goto done;
 715 02b87977 2019-10-06 stsp 			}
 716 6dea73df 2019-09-23 stsp 			cp = new;
 717 6dea73df 2019-09-23 stsp 		}
 718 6dea73df 2019-09-23 stsp 		cp[len - 1] = '\n';
 719 6dea73df 2019-09-23 stsp 		cp[len] = '\0';
 720 74b37681 2019-02-07 stsp 	}
 721 6dea73df 2019-09-23 stsp 
 722 6dea73df 2019-09-23 stsp 	free(d3s->buf);
 723 02b87977 2019-10-06 stsp 	*ret = d3s->buf = cp;
 724 6dea73df 2019-09-23 stsp 	cp = NULL;
 725 74b37681 2019-02-07 stsp 	if (n != NULL)
 726 74b37681 2019-02-07 stsp 		*n = len;
 727 6dea73df 2019-09-23 stsp done:
 728 6dea73df 2019-09-23 stsp 	free(cp);
 729 02b87977 2019-10-06 stsp 	return err;
 730 74b37681 2019-02-07 stsp }
 731 74b37681 2019-02-07 stsp 
 732 180dce26 2019-10-06 stsp static const struct got_error *
 733 078e971d 2019-02-08 stsp merge(size_t m1, size_t m2, struct diff3_state *d3s)
 734 74b37681 2019-02-07 stsp {
 735 180dce26 2019-10-06 stsp 	const struct got_error *err = NULL;
 736 18b9ebab 2019-10-06 stsp 	struct diff *d1, *d2;
 737 74b37681 2019-02-07 stsp 	int dpl, j, t1, t2;
 738 74b37681 2019-02-07 stsp 
 739 078e971d 2019-02-08 stsp 	d1 = d3s->d13;
 740 078e971d 2019-02-08 stsp 	d2 = d3s->d23;
 741 74b37681 2019-02-07 stsp 	j = 0;
 742 74b37681 2019-02-07 stsp 	for (;;) {
 743 078e971d 2019-02-08 stsp 		t1 = (d1 < d3s->d13 + m1);
 744 078e971d 2019-02-08 stsp 		t2 = (d2 < d3s->d23 + m2);
 745 74b37681 2019-02-07 stsp 		if (!t1 && !t2)
 746 74b37681 2019-02-07 stsp 			break;
 747 74b37681 2019-02-07 stsp 
 748 74b37681 2019-02-07 stsp 		/* first file is different from others */
 749 74b37681 2019-02-07 stsp 		if (!t2 || (t1 && d1->new.to < d2->new.from)) {
 750 74b37681 2019-02-07 stsp 			/* stuff peculiar to 1st file */
 751 74b37681 2019-02-07 stsp 			d1++;
 752 74b37681 2019-02-07 stsp 			continue;
 753 74b37681 2019-02-07 stsp 		}
 754 74b37681 2019-02-07 stsp 
 755 74b37681 2019-02-07 stsp 		/* second file is different from others */
 756 74b37681 2019-02-07 stsp 		if (!t1 || (t2 && d2->new.to < d1->new.from)) {
 757 74b37681 2019-02-07 stsp 			d2++;
 758 74b37681 2019-02-07 stsp 			continue;
 759 74b37681 2019-02-07 stsp 		}
 760 74b37681 2019-02-07 stsp 
 761 74b37681 2019-02-07 stsp 		/*
 762 74b37681 2019-02-07 stsp 		 * Merge overlapping changes in first file
 763 74b37681 2019-02-07 stsp 		 * this happens after extension (see below).
 764 74b37681 2019-02-07 stsp 		 */
 765 078e971d 2019-02-08 stsp 		if (d1 + 1 < d3s->d13 + m1 && d1->new.to >= d1[1].new.from) {
 766 74b37681 2019-02-07 stsp 			d1[1].old.from = d1->old.from;
 767 74b37681 2019-02-07 stsp 			d1[1].new.from = d1->new.from;
 768 74b37681 2019-02-07 stsp 			d1++;
 769 74b37681 2019-02-07 stsp 			continue;
 770 74b37681 2019-02-07 stsp 		}
 771 74b37681 2019-02-07 stsp 
 772 74b37681 2019-02-07 stsp 		/* merge overlapping changes in second */
 773 078e971d 2019-02-08 stsp 		if (d2 + 1 < d3s->d23 + m2 && d2->new.to >= d2[1].new.from) {
 774 74b37681 2019-02-07 stsp 			d2[1].old.from = d2->old.from;
 775 74b37681 2019-02-07 stsp 			d2[1].new.from = d2->new.from;
 776 74b37681 2019-02-07 stsp 			d2++;
 777 74b37681 2019-02-07 stsp 			continue;
 778 74b37681 2019-02-07 stsp 		}
 779 74b37681 2019-02-07 stsp 		/* stuff peculiar to third file or different in all */
 780 74b37681 2019-02-07 stsp 		if (d1->new.from == d2->new.from && d1->new.to == d2->new.to) {
 781 d136cfcb 2019-10-12 stsp 			err = duplicate(&dpl, j, &d1->old, &d2->old, d3s);
 782 180dce26 2019-10-06 stsp 			if (err)
 783 180dce26 2019-10-06 stsp 				return err;
 784 74b37681 2019-02-07 stsp 
 785 74b37681 2019-02-07 stsp 			/*
 786 74b37681 2019-02-07 stsp 			 * dpl = 0 means all files differ
 787 74b37681 2019-02-07 stsp 			 * dpl = 1 means files 1 and 2 identical
 788 74b37681 2019-02-07 stsp 			 */
 789 18b9ebab 2019-10-06 stsp 			err = edit(d1, dpl, &j, d3s);
 790 18b9ebab 2019-10-06 stsp 			if (err)
 791 18b9ebab 2019-10-06 stsp 				return err;
 792 74b37681 2019-02-07 stsp 			d1++;
 793 74b37681 2019-02-07 stsp 			d2++;
 794 74b37681 2019-02-07 stsp 			continue;
 795 74b37681 2019-02-07 stsp 		}
 796 74b37681 2019-02-07 stsp 
 797 74b37681 2019-02-07 stsp 		/*
 798 74b37681 2019-02-07 stsp 		 * Overlapping changes from file 1 and 2; extend changes
 799 74b37681 2019-02-07 stsp 		 * appropriately to make them coincide.
 800 74b37681 2019-02-07 stsp 		 */
 801 74b37681 2019-02-07 stsp 		if (d1->new.from < d2->new.from) {
 802 e19660d5 2019-10-06 stsp 			d2->old.from -= d2->new.from - d1->new.from;
 803 74b37681 2019-02-07 stsp 			d2->new.from = d1->new.from;
 804 74b37681 2019-02-07 stsp 		} else if (d2->new.from < d1->new.from) {
 805 e19660d5 2019-10-06 stsp 			d1->old.from -= d1->new.from - d2->new.from;
 806 74b37681 2019-02-07 stsp 			d1->new.from = d2->new.from;
 807 74b37681 2019-02-07 stsp 		}
 808 74b37681 2019-02-07 stsp 		if (d1->new.to > d2->new.to) {
 809 74b37681 2019-02-07 stsp 			d2->old.to += d1->new.to - d2->new.to;
 810 74b37681 2019-02-07 stsp 			d2->new.to = d1->new.to;
 811 74b37681 2019-02-07 stsp 		} else if (d2->new.to > d1->new.to) {
 812 74b37681 2019-02-07 stsp 			d1->old.to += d2->new.to - d1->new.to;
 813 74b37681 2019-02-07 stsp 			d1->new.to = d2->new.to;
 814 74b37681 2019-02-07 stsp 		}
 815 74b37681 2019-02-07 stsp 	}
 816 74b37681 2019-02-07 stsp 
 817 078e971d 2019-02-08 stsp 	return (edscript(j, d3s));
 818 74b37681 2019-02-07 stsp }
 819 74b37681 2019-02-07 stsp 
 820 74b37681 2019-02-07 stsp /*
 821 74b37681 2019-02-07 stsp  * print the range of line numbers, rold.from thru rold.to, as n1,n2 or n1
 822 74b37681 2019-02-07 stsp  */
 823 ce09ab8d 2019-10-06 stsp static const struct got_error *
 824 b2338eff 2019-10-09 stsp prange(struct line_range *rold, struct diff3_state *d3s)
 825 74b37681 2019-02-07 stsp {
 826 ce09ab8d 2019-10-06 stsp 	const struct got_error *err = NULL;
 827 ce09ab8d 2019-10-06 stsp 
 828 ce09ab8d 2019-10-06 stsp 	if (rold->to <= rold->from) {
 829 ce09ab8d 2019-10-06 stsp 		err = diff_output(d3s->diffbuf, "%da\n", rold->from - 1);
 830 ce09ab8d 2019-10-06 stsp 		if (err)
 831 ce09ab8d 2019-10-06 stsp 			return err;
 832 ce09ab8d 2019-10-06 stsp 	} else {
 833 ce09ab8d 2019-10-06 stsp 		err = diff_output(d3s->diffbuf, "%d", rold->from);
 834 ce09ab8d 2019-10-06 stsp 		if (err)
 835 ce09ab8d 2019-10-06 stsp 			return err;
 836 ce09ab8d 2019-10-06 stsp 		if (rold->to > rold->from + 1) {
 837 ce09ab8d 2019-10-06 stsp 			err = diff_output(d3s->diffbuf, ",%d", rold->to - 1);
 838 ce09ab8d 2019-10-06 stsp 			if (err)
 839 ce09ab8d 2019-10-06 stsp 				return err;
 840 ce09ab8d 2019-10-06 stsp 		}
 841 ce09ab8d 2019-10-06 stsp 		err = diff_output(d3s->diffbuf, "c\n");
 842 ce09ab8d 2019-10-06 stsp 		if (err)
 843 ce09ab8d 2019-10-06 stsp 			return err;
 844 74b37681 2019-02-07 stsp 	}
 845 ce09ab8d 2019-10-06 stsp 
 846 ce09ab8d 2019-10-06 stsp 	return NULL;
 847 74b37681 2019-02-07 stsp }
 848 74b37681 2019-02-07 stsp 
 849 88775814 2019-10-09 stsp /*
 850 88775814 2019-10-09 stsp  * Skip to just before line number from in file "i".
 851 88775814 2019-10-09 stsp  * Return the number of bytes skipped in *nskipped.
 852 88775814 2019-10-09 stsp  */
 853 02b87977 2019-10-06 stsp static const struct got_error *
 854 88775814 2019-10-09 stsp skip(size_t *nskipped, int i, int from, struct diff3_state *d3s)
 855 74b37681 2019-02-07 stsp {
 856 02b87977 2019-10-06 stsp 	const struct got_error *err = NULL;
 857 9d4a5e89 2019-10-09 stsp 	size_t len, n;
 858 74b37681 2019-02-07 stsp 	char *line;
 859 74b37681 2019-02-07 stsp 
 860 02b87977 2019-10-06 stsp 	*nskipped = 0;
 861 9d4a5e89 2019-10-09 stsp 	for (n = 0; d3s->cline[i] < from - 1; n += len) {
 862 9d4a5e89 2019-10-09 stsp 		err = get_line(&line, d3s->fp[i], &len, d3s);
 863 02b87977 2019-10-06 stsp 		if (err)
 864 02b87977 2019-10-06 stsp 			return err;
 865 078e971d 2019-02-08 stsp 		d3s->cline[i]++;
 866 74b37681 2019-02-07 stsp 	}
 867 02b87977 2019-10-06 stsp 	*nskipped = n;
 868 02b87977 2019-10-06 stsp 	return NULL;
 869 74b37681 2019-02-07 stsp }
 870 74b37681 2019-02-07 stsp 
 871 74b37681 2019-02-07 stsp /*
 872 180dce26 2019-10-06 stsp  * Set *dpl to 1 or 0 according as the old range (in file 1) contains exactly
 873 74b37681 2019-02-07 stsp  * the same data as the new range (in file 2).
 874 d136cfcb 2019-10-12 stsp  *
 875 d136cfcb 2019-10-12 stsp  * If this change could overlap, remember start/end offsets in file 2 so we
 876 d136cfcb 2019-10-12 stsp  * can write out the original lines of text if a merge conflict occurs.
 877 74b37681 2019-02-07 stsp  */
 878 180dce26 2019-10-06 stsp static const struct got_error *
 879 d136cfcb 2019-10-12 stsp duplicate(int *dpl, int j, struct line_range *r1, struct line_range *r2,
 880 b2338eff 2019-10-09 stsp     struct diff3_state *d3s)
 881 74b37681 2019-02-07 stsp {
 882 f571bb85 2019-10-06 stsp 	const struct got_error *err = NULL;
 883 74b37681 2019-02-07 stsp 	int c,d;
 884 74b37681 2019-02-07 stsp 	int nchar;
 885 88775814 2019-10-09 stsp 	int nline;
 886 88775814 2019-10-09 stsp 	size_t nskipped;
 887 d136cfcb 2019-10-12 stsp 	off_t off;
 888 74b37681 2019-02-07 stsp 
 889 180dce26 2019-10-06 stsp 	*dpl = 0;
 890 180dce26 2019-10-06 stsp 
 891 e19660d5 2019-10-06 stsp 	if (r1->to - r1->from != r2->to - r2->from)
 892 180dce26 2019-10-06 stsp 		return NULL;
 893 180dce26 2019-10-06 stsp 
 894 50351dee 2019-10-09 stsp 	err = skip(&nskipped, 0, r1->from, d3s);
 895 02b87977 2019-10-06 stsp 	if (err)
 896 02b87977 2019-10-06 stsp 		return err;
 897 50351dee 2019-10-09 stsp 	err = skip(&nskipped, 1, r2->from, d3s);
 898 02b87977 2019-10-06 stsp 	if (err)
 899 02b87977 2019-10-06 stsp 		return err;
 900 d136cfcb 2019-10-12 stsp 
 901 d136cfcb 2019-10-12 stsp 	off = ftello(d3s->fp[1]);
 902 d136cfcb 2019-10-12 stsp 	if (off == -1)
 903 d136cfcb 2019-10-12 stsp 		return got_error_from_errno("ftello");
 904 d136cfcb 2019-10-12 stsp 	d3s->de[j + 1].oldo.from = off; /* original lines start here */
 905 d136cfcb 2019-10-12 stsp 
 906 74b37681 2019-02-07 stsp 	nchar = 0;
 907 e19660d5 2019-10-06 stsp 	for (nline = 0; nline < r1->to - r1->from; nline++) {
 908 74b37681 2019-02-07 stsp 		do {
 909 078e971d 2019-02-08 stsp 			c = getc(d3s->fp[0]);
 910 078e971d 2019-02-08 stsp 			d = getc(d3s->fp[1]);
 911 1fee9f40 2021-04-13 stsp 			if (c == EOF && d == EOF)
 912 1fee9f40 2021-04-13 stsp 				break;
 913 1fee9f40 2021-04-13 stsp 			else if (c == EOF)
 914 1fee9f40 2021-04-13 stsp 				return got_ferror(d3s->fp[0], GOT_ERR_EOF);
 915 1fee9f40 2021-04-13 stsp 			else if (d == EOF)
 916 180dce26 2019-10-06 stsp 				return got_ferror(d3s->fp[1], GOT_ERR_EOF);
 917 74b37681 2019-02-07 stsp 			nchar++;
 918 d136cfcb 2019-10-12 stsp 			if (c != d) {
 919 d136cfcb 2019-10-12 stsp 				long orig_line_len = nchar;
 920 d136cfcb 2019-10-12 stsp 				while (d != '\n') {
 921 d136cfcb 2019-10-12 stsp 					d = getc(d3s->fp[1]);
 922 d136cfcb 2019-10-12 stsp 					if (d == EOF)
 923 d136cfcb 2019-10-12 stsp 						break;
 924 d136cfcb 2019-10-12 stsp 					orig_line_len++;
 925 d136cfcb 2019-10-12 stsp 				}
 926 d136cfcb 2019-10-12 stsp 				if (orig_line_len > nchar &&
 927 d136cfcb 2019-10-12 stsp 				    fseek(d3s->fp[1], -(orig_line_len - nchar),
 928 d136cfcb 2019-10-12 stsp 				    SEEK_CUR) == -1)
 929 d136cfcb 2019-10-12 stsp 					return got_ferror(d3s->fp[1],
 930 d136cfcb 2019-10-12 stsp 						GOT_ERR_IO);
 931 abc59930 2021-09-05 naddy 				/* original lines end here */
 932 d136cfcb 2019-10-12 stsp 				d3s->de[j + 1].oldo.to = off + orig_line_len;
 933 d136cfcb 2019-10-12 stsp 				err = repos(nchar, d3s);
 934 d136cfcb 2019-10-12 stsp 				if (err)
 935 d136cfcb 2019-10-12 stsp 					return err;
 936 d136cfcb 2019-10-12 stsp 				return NULL;
 937 d136cfcb 2019-10-12 stsp 			}
 938 74b37681 2019-02-07 stsp 		} while (c != '\n');
 939 74b37681 2019-02-07 stsp 	}
 940 d27f8617 2021-10-17 thomas 
 941 d27f8617 2021-10-17 thomas 	/* original lines end here */
 942 d27f8617 2021-10-17 thomas 	d3s->de[j + 1].oldo.to = off + nchar;
 943 d27f8617 2021-10-17 thomas 
 944 f571bb85 2019-10-06 stsp 	err = repos(nchar, d3s);
 945 f571bb85 2019-10-06 stsp 	if (err)
 946 f571bb85 2019-10-06 stsp 		return err;
 947 180dce26 2019-10-06 stsp 	*dpl = 1;
 948 180dce26 2019-10-06 stsp 	return NULL;
 949 74b37681 2019-02-07 stsp }
 950 74b37681 2019-02-07 stsp 
 951 f571bb85 2019-10-06 stsp static const struct got_error *
 952 078e971d 2019-02-08 stsp repos(int nchar, struct diff3_state *d3s)
 953 74b37681 2019-02-07 stsp {
 954 74b37681 2019-02-07 stsp 	int i;
 955 74b37681 2019-02-07 stsp 
 956 f571bb85 2019-10-06 stsp 	for (i = 0; i < 2; i++) {
 957 f571bb85 2019-10-06 stsp 		if (fseek(d3s->fp[i], (long)-nchar, SEEK_CUR) == -1)
 958 f571bb85 2019-10-06 stsp 			return got_ferror(d3s->fp[i], GOT_ERR_IO);
 959 f571bb85 2019-10-06 stsp 	}
 960 f571bb85 2019-10-06 stsp 
 961 f571bb85 2019-10-06 stsp 	return NULL;
 962 74b37681 2019-02-07 stsp }
 963 74b37681 2019-02-07 stsp 
 964 74b37681 2019-02-07 stsp /*
 965 74b37681 2019-02-07 stsp  * collect an editing script for later regurgitation
 966 74b37681 2019-02-07 stsp  */
 967 02b87977 2019-10-06 stsp static const struct got_error *
 968 02b87977 2019-10-06 stsp edit(struct diff *diff, int fdup, int *j, struct diff3_state *d3s)
 969 74b37681 2019-02-07 stsp {
 970 02b87977 2019-10-06 stsp 	const struct got_error *err = NULL;
 971 88775814 2019-10-09 stsp 	size_t nskipped;
 972 02b87977 2019-10-06 stsp 
 973 18b9ebab 2019-10-06 stsp 	if (((fdup + 1) & 3) == 0)
 974 02b87977 2019-10-06 stsp 		return NULL;
 975 02b87977 2019-10-06 stsp 	(*j)++;
 976 02b87977 2019-10-06 stsp 	d3s->overlap[*j] = !fdup;
 977 74b37681 2019-02-07 stsp 	if (!fdup)
 978 078e971d 2019-02-08 stsp 		d3s->overlapcnt++;
 979 02b87977 2019-10-06 stsp 	d3s->de[*j].old.from = diff->old.from;
 980 02b87977 2019-10-06 stsp 	d3s->de[*j].old.to = diff->old.to;
 981 b2338eff 2019-10-09 stsp 
 982 50351dee 2019-10-09 stsp 	err = skip(&nskipped, 2, diff->new.from, d3s);
 983 02b87977 2019-10-06 stsp 	if (err)
 984 02b87977 2019-10-06 stsp 		return err;
 985 b2338eff 2019-10-09 stsp 	d3s->de[*j].newo.from = d3s->de[*j - 1].newo.to + nskipped;
 986 b2338eff 2019-10-09 stsp 
 987 50351dee 2019-10-09 stsp 	err = skip(&nskipped, 2, diff->new.to, d3s);
 988 b2338eff 2019-10-09 stsp 	if (err)
 989 b2338eff 2019-10-09 stsp 		return err;
 990 b2338eff 2019-10-09 stsp 	d3s->de[*j].newo.to = d3s->de[*j].newo.from + nskipped;
 991 02b87977 2019-10-06 stsp 	return NULL;
 992 74b37681 2019-02-07 stsp }
 993 74b37681 2019-02-07 stsp 
 994 74b37681 2019-02-07 stsp /* regurgitate */
 995 180dce26 2019-10-06 stsp static const struct got_error *
 996 078e971d 2019-02-08 stsp edscript(int n, struct diff3_state *d3s)
 997 74b37681 2019-02-07 stsp {
 998 ce09ab8d 2019-10-06 stsp 	const struct got_error *err = NULL;
 999 461f6aed 2021-10-12 thomas 	off_t len;
1000 461f6aed 2021-10-12 thomas 	char *line = NULL;
1001 461f6aed 2021-10-12 thomas 	size_t linesize = 0;
1002 b6c8e5e0 2021-10-12 thomas 	ssize_t linelen = 0, k;
1003 74b37681 2019-02-07 stsp 
1004 74b37681 2019-02-07 stsp 	for (; n > 0; n--) {
1005 ce09ab8d 2019-10-06 stsp 		if (!d3s->overlap[n]) {
1006 ce09ab8d 2019-10-06 stsp 			err = prange(&d3s->de[n].old, d3s);
1007 ce09ab8d 2019-10-06 stsp 			if (err)
1008 ce09ab8d 2019-10-06 stsp 				return err;
1009 d136cfcb 2019-10-12 stsp 		} else if (d3s->de[n].oldo.from < d3s->de[n].oldo.to) {
1010 d136cfcb 2019-10-12 stsp 			/* Output a block of 3-way diff base file content. */
1011 461f6aed 2021-10-12 thomas 			err = diff_output(d3s->diffbuf, "%da\n:%s\n",
1012 f69721c3 2019-10-21 stsp 			    d3s->de[n].old.to - 1, d3s->f2mark);
1013 d136cfcb 2019-10-12 stsp 			if (err)
1014 d136cfcb 2019-10-12 stsp 				return err;
1015 d136cfcb 2019-10-12 stsp 			if (fseeko(d3s->fp[1], d3s->de[n].oldo.from, SEEK_SET)
1016 d136cfcb 2019-10-12 stsp 			    == -1)
1017 d136cfcb 2019-10-12 stsp 				return got_error_from_errno("fseeko");
1018 461f6aed 2021-10-12 thomas 			len = (d3s->de[n].oldo.to - d3s->de[n].oldo.from);
1019 461f6aed 2021-10-12 thomas 			for (k = 0; k < (ssize_t)len; k += linelen) {
1020 461f6aed 2021-10-12 thomas 				linelen = getline(&line, &linesize, d3s->fp[1]);
1021 461f6aed 2021-10-12 thomas 				if (linelen == -1) {
1022 21c17f12 2020-06-26 stsp 					if (feof(d3s->fp[1]))
1023 21c17f12 2020-06-26 stsp 						break;
1024 461f6aed 2021-10-12 thomas 					err = got_ferror(d3s->fp[1],
1025 d136cfcb 2019-10-12 stsp 					    GOT_ERR_IO);
1026 461f6aed 2021-10-12 thomas 					goto done;
1027 21c17f12 2020-06-26 stsp 				}
1028 461f6aed 2021-10-12 thomas 				err = diff_output(d3s->diffbuf, ":%s", line);
1029 d136cfcb 2019-10-12 stsp 				if (err)
1030 461f6aed 2021-10-12 thomas 					goto done;
1031 d136cfcb 2019-10-12 stsp 			}
1032 461f6aed 2021-10-12 thomas 			err = diff_output(d3s->diffbuf, "%s%s\n",
1033 b6c8e5e0 2021-10-12 thomas 			    linelen > 0 && line[linelen] == '\n' ? ":" : "",
1034 d136cfcb 2019-10-12 stsp 			    GOT_DIFF_CONFLICT_MARKER_SEP);
1035 d136cfcb 2019-10-12 stsp 			if (err)
1036 461f6aed 2021-10-12 thomas 				goto done;
1037 abc59930 2021-09-05 naddy 		} else {
1038 461f6aed 2021-10-12 thomas 			err = diff_output(d3s->diffbuf, "%da\n:%s\n",
1039 01a44956 2019-03-27 stsp 			    d3s->de[n].old.to -1, GOT_DIFF_CONFLICT_MARKER_SEP);
1040 ce09ab8d 2019-10-06 stsp 			if (err)
1041 461f6aed 2021-10-12 thomas 				goto done;
1042 ce09ab8d 2019-10-06 stsp 		}
1043 b2338eff 2019-10-09 stsp 		if (fseeko(d3s->fp[2], d3s->de[n].newo.from, SEEK_SET)
1044 461f6aed 2021-10-12 thomas 		    == -1) {
1045 461f6aed 2021-10-12 thomas 			err = got_error_from_errno("fseek");
1046 461f6aed 2021-10-12 thomas 			goto done;
1047 461f6aed 2021-10-12 thomas 		}
1048 461f6aed 2021-10-12 thomas 		len = (d3s->de[n].newo.to - d3s->de[n].newo.from);
1049 461f6aed 2021-10-12 thomas 		for (k = 0; k < (ssize_t)len; k += linelen) {
1050 461f6aed 2021-10-12 thomas 			linelen = getline(&line, &linesize, d3s->fp[2]);
1051 461f6aed 2021-10-12 thomas 			if (linelen == -1) {
1052 21c17f12 2020-06-26 stsp 				if (feof(d3s->fp[2]))
1053 21c17f12 2020-06-26 stsp 					break;
1054 461f6aed 2021-10-12 thomas 				err = got_ferror(d3s->fp[2], GOT_ERR_IO);
1055 461f6aed 2021-10-12 thomas 				goto done;
1056 21c17f12 2020-06-26 stsp 			}
1057 461f6aed 2021-10-12 thomas 			err = diff_output(d3s->diffbuf, ":%s", line);
1058 ce09ab8d 2019-10-06 stsp 			if (err)
1059 461f6aed 2021-10-12 thomas 				goto done;
1060 74b37681 2019-02-07 stsp 		}
1061 74b37681 2019-02-07 stsp 
1062 ce09ab8d 2019-10-06 stsp 		if (!d3s->overlap[n]) {
1063 ce09ab8d 2019-10-06 stsp 			err = diff_output(d3s->diffbuf, ".\n");
1064 ce09ab8d 2019-10-06 stsp 			if (err)
1065 461f6aed 2021-10-12 thomas 				goto done;
1066 ce09ab8d 2019-10-06 stsp 		} else {
1067 461f6aed 2021-10-12 thomas 			err = diff_output(d3s->diffbuf, "%s%s\n.\n",
1068 3c7939fe 2021-10-17 thomas 			    linelen > 0 && line[linelen] == '\n' ? ":" : "",
1069 461f6aed 2021-10-12 thomas 			    d3s->f3mark);
1070 ce09ab8d 2019-10-06 stsp 			if (err)
1071 461f6aed 2021-10-12 thomas 				goto done;
1072 461f6aed 2021-10-12 thomas 			err = diff_output(d3s->diffbuf, "%da\n:%s\n.\n",
1073 5176f942 2019-02-08 stsp 			    d3s->de[n].old.from - 1, d3s->f1mark);
1074 ce09ab8d 2019-10-06 stsp 			if (err)
1075 461f6aed 2021-10-12 thomas 				goto done;
1076 74b37681 2019-02-07 stsp 		}
1077 74b37681 2019-02-07 stsp 	}
1078 461f6aed 2021-10-12 thomas done:
1079 461f6aed 2021-10-12 thomas 	free(line);
1080 461f6aed 2021-10-12 thomas 	return err;
1081 74b37681 2019-02-07 stsp }
1082 74b37681 2019-02-07 stsp 
1083 c03c6cb3 2019-02-08 stsp static const struct got_error *
1084 078e971d 2019-02-08 stsp increase(struct diff3_state *d3s)
1085 74b37681 2019-02-07 stsp {
1086 74b37681 2019-02-07 stsp 	size_t newsz, incr;
1087 c03c6cb3 2019-02-08 stsp 	struct diff *d;
1088 c03c6cb3 2019-02-08 stsp 	char *s;
1089 74b37681 2019-02-07 stsp 
1090 74b37681 2019-02-07 stsp 	/* are the memset(3) calls needed? */
1091 078e971d 2019-02-08 stsp 	newsz = d3s->szchanges == 0 ? 64 : 2 * d3s->szchanges;
1092 078e971d 2019-02-08 stsp 	incr = newsz - d3s->szchanges;
1093 74b37681 2019-02-07 stsp 
1094 078e971d 2019-02-08 stsp 	d = reallocarray(d3s->d13, newsz, sizeof(*d3s->d13));
1095 c03c6cb3 2019-02-08 stsp 	if (d == NULL)
1096 638f9024 2019-05-13 stsp 		return got_error_from_errno("reallocarray");
1097 078e971d 2019-02-08 stsp 	d3s->d13 = d;
1098 078e971d 2019-02-08 stsp 	memset(d3s->d13 + d3s->szchanges, 0, incr * sizeof(*d3s->d13));
1099 c03c6cb3 2019-02-08 stsp 
1100 078e971d 2019-02-08 stsp 	d = reallocarray(d3s->d23, newsz, sizeof(*d3s->d23));
1101 c03c6cb3 2019-02-08 stsp 	if (d == NULL)
1102 638f9024 2019-05-13 stsp 		return got_error_from_errno("reallocarray");
1103 078e971d 2019-02-08 stsp 	d3s->d23 = d;
1104 078e971d 2019-02-08 stsp 	memset(d3s->d23 + d3s->szchanges, 0, incr * sizeof(*d3s->d23));
1105 c03c6cb3 2019-02-08 stsp 
1106 078e971d 2019-02-08 stsp 	d = reallocarray(d3s->de, newsz, sizeof(*d3s->de));
1107 c03c6cb3 2019-02-08 stsp 	if (d == NULL)
1108 638f9024 2019-05-13 stsp 		return got_error_from_errno("reallocarray");
1109 078e971d 2019-02-08 stsp 	d3s->de = d;
1110 078e971d 2019-02-08 stsp 	memset(d3s->de + d3s->szchanges, 0, incr * sizeof(*d3s->de));
1111 c03c6cb3 2019-02-08 stsp 
1112 078e971d 2019-02-08 stsp 	s = reallocarray(d3s->overlap, newsz, sizeof(*d3s->overlap));
1113 c03c6cb3 2019-02-08 stsp 	if (s == NULL)
1114 638f9024 2019-05-13 stsp 		return got_error_from_errno("reallocarray");
1115 078e971d 2019-02-08 stsp 	d3s->overlap = s;
1116 078e971d 2019-02-08 stsp 	memset(d3s->overlap + d3s->szchanges, 0, incr * sizeof(*d3s->overlap));
1117 078e971d 2019-02-08 stsp 	d3s->szchanges = newsz;
1118 c03c6cb3 2019-02-08 stsp 
1119 c03c6cb3 2019-02-08 stsp 	return NULL;
1120 74b37681 2019-02-07 stsp }