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annotate src/xdiff/xemit.c @ 14696:195e8b1fcbbf v8.1.0360

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patch 8.1.0360: using an external diff program is slow and inflexible commit https://github.com/vim/vim/commit/e828b7621cf9065a3582be0c4dd1e0e846e335bf Author: Bram Moolenaar <Bram@vim.org> Date: Mon Sep 10 17:51:58 2018 +0200 patch 8.1.0360: using an external diff program is slow and inflexible Problem: Using an external diff program is slow and inflexible. Solution: Include the xdiff library. (Christian Brabandt, closes https://github.com/vim/vim/issues/2732) Use it by default.
author Christian Brabandt <cb@256bit.org>
date Mon, 10 Sep 2018 18:00:06 +0200
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children 150274bc6f5c
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14696
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1 /*
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2 * LibXDiff by Davide Libenzi ( File Differential Library )
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3 * Copyright (C) 2003 Davide Libenzi
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4 *
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5 * This library is free software; you can redistribute it and/or
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6 * modify it under the terms of the GNU Lesser General Public
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7 * License as published by the Free Software Foundation; either
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8 * version 2.1 of the License, or (at your option) any later version.
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9 *
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10 * This library is distributed in the hope that it will be useful,
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11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 * Lesser General Public License for more details.
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14 *
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15 * You should have received a copy of the GNU Lesser General Public
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16 * License along with this library; if not, see
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17 * <http://www.gnu.org/licenses/>.
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18 *
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19 * Davide Libenzi <davidel@xmailserver.org>
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20 *
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21 */
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22
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23 #include "xinclude.h"
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24
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25 static long xdl_get_rec(xdfile_t *xdf, long ri, char const **rec) {
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26
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27 *rec = xdf->recs[ri]->ptr;
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28
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29 return xdf->recs[ri]->size;
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30 }
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31
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32
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33 static int xdl_emit_record(xdfile_t *xdf, long ri, char const *pre, xdemitcb_t *ecb) {
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34 long size, psize = strlen(pre);
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35 char const *rec;
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36
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37 size = xdl_get_rec(xdf, ri, &rec);
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38 if (xdl_emit_diffrec(rec, size, pre, psize, ecb) < 0) {
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39
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40 return -1;
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41 }
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42
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43 return 0;
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44 }
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45
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46
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47 /*
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48 * Starting at the passed change atom, find the latest change atom to be included
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49 * inside the differential hunk according to the specified configuration.
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50 * Also advance xscr if the first changes must be discarded.
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51 */
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52 xdchange_t *xdl_get_hunk(xdchange_t **xscr, xdemitconf_t const *xecfg)
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53 {
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54 xdchange_t *xch, *xchp, *lxch;
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55 long max_common = 2 * xecfg->ctxlen + xecfg->interhunkctxlen;
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56 long max_ignorable = xecfg->ctxlen;
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57 unsigned long ignored = 0; /* number of ignored blank lines */
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58
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59 /* remove ignorable changes that are too far before other changes */
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60 for (xchp = *xscr; xchp && xchp->ignore; xchp = xchp->next) {
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61 xch = xchp->next;
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62
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63 if (xch == NULL ||
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64 xch->i1 - (xchp->i1 + xchp->chg1) >= max_ignorable)
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65 *xscr = xch;
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66 }
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67
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68 if (*xscr == NULL)
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69 return NULL;
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70
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71 lxch = *xscr;
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72
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73 for (xchp = *xscr, xch = xchp->next; xch; xchp = xch, xch = xch->next) {
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74 long distance = xch->i1 - (xchp->i1 + xchp->chg1);
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75 if (distance > max_common)
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76 break;
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77
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78 if (distance < max_ignorable && (!xch->ignore || lxch == xchp)) {
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79 lxch = xch;
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80 ignored = 0;
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81 } else if (distance < max_ignorable && xch->ignore) {
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82 ignored += xch->chg2;
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83 } else if (lxch != xchp &&
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84 xch->i1 + (long)ignored - (lxch->i1 + lxch->chg1) > max_common) {
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85 break;
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86 } else if (!xch->ignore) {
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87 lxch = xch;
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88 ignored = 0;
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89 } else {
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90 ignored += xch->chg2;
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91 }
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92 }
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93
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94 return lxch;
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95 }
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96
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97
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98 static long def_ff(const char *rec, long len, char *buf, long sz, void *priv UNUSED)
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99 {
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100 if (len > 0 &&
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101 (isalpha((unsigned char)*rec) || /* identifier? */
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102 *rec == '_' || /* also identifier? */
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103 *rec == '$')) { /* identifiers from VMS and other esoterico */
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104 if (len > sz)
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105 len = sz;
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106 while (0 < len && isspace((unsigned char)rec[len - 1]))
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107 len--;
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108 memcpy(buf, rec, len);
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109 return len;
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110 }
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111 return -1;
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112 }
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113
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114 static long match_func_rec(xdfile_t *xdf, xdemitconf_t const *xecfg, long ri,
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115 char *buf, long sz)
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116 {
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117 const char *rec;
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118 long len = xdl_get_rec(xdf, ri, &rec);
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119 if (!xecfg->find_func)
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120 return def_ff(rec, len, buf, sz, xecfg->find_func_priv);
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121 return xecfg->find_func(rec, len, buf, sz, xecfg->find_func_priv);
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122 }
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123
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124 static int is_func_rec(xdfile_t *xdf, xdemitconf_t const *xecfg, long ri)
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
125 {
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
126 char dummy[1];
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
127 return match_func_rec(xdf, xecfg, ri, dummy, sizeof(dummy)) >= 0;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
128 }
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
129
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
130 struct func_line {
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
131 long len;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
132 char buf[80];
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
133 };
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
134
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
135 static long get_func_line(xdfenv_t *xe, xdemitconf_t const *xecfg,
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
136 struct func_line *func_line, long start, long limit)
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
137 {
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
138 long l, size, step = (start > limit) ? -1 : 1;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
139 char *buf, dummy[1];
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
140
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
141 buf = func_line ? func_line->buf : dummy;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
142 size = func_line ? sizeof(func_line->buf) : sizeof(dummy);
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
143
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
144 for (l = start; l != limit && 0 <= l && l < xe->xdf1.nrec; l += step) {
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
145 long len = match_func_rec(&xe->xdf1, xecfg, l, buf, size);
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
146 if (len >= 0) {
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
147 if (func_line)
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
148 func_line->len = len;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
149 return l;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
150 }
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
151 }
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
152 return -1;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
153 }
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
154
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
155 static int is_empty_rec(xdfile_t *xdf, long ri)
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
156 {
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
157 const char *rec;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
158 long len = xdl_get_rec(xdf, ri, &rec);
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
159
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
160 while (len > 0 && XDL_ISSPACE(*rec)) {
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
161 rec++;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
162 len--;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
163 }
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
164 return !len;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
165 }
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
166
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
167 int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
168 xdemitconf_t const *xecfg) {
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
169 long s1, s2, e1, e2, lctx;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
170 xdchange_t *xch, *xche;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
171 long funclineprev = -1;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
172 struct func_line func_line = { 0 };
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
173
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
174 for (xch = xscr; xch; xch = xche->next) {
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
175 xche = xdl_get_hunk(&xch, xecfg);
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
176 if (!xch)
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
177 break;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
178
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
179 s1 = XDL_MAX(xch->i1 - xecfg->ctxlen, 0);
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
180 s2 = XDL_MAX(xch->i2 - xecfg->ctxlen, 0);
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
181
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
182 if (xecfg->flags & XDL_EMIT_FUNCCONTEXT) {
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
183 long fs1, i1 = xch->i1;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
184
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
185 /* Appended chunk? */
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
186 if (i1 >= xe->xdf1.nrec) {
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
187 long i2 = xch->i2;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
188
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
189 /*
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
190 * We don't need additional context if
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
191 * a whole function was added.
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
192 */
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
193 while (i2 < xe->xdf2.nrec) {
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
194 if (is_func_rec(&xe->xdf2, xecfg, i2))
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
195 goto post_context_calculation;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
196 i2++;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
197 }
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
198
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
199 /*
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
200 * Otherwise get more context from the
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
201 * pre-image.
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
202 */
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
203 i1 = xe->xdf1.nrec - 1;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
204 }
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
205
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
206 fs1 = get_func_line(xe, xecfg, NULL, i1, -1);
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
207 while (fs1 > 0 && !is_empty_rec(&xe->xdf1, fs1 - 1) &&
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
208 !is_func_rec(&xe->xdf1, xecfg, fs1 - 1))
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
209 fs1--;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
210 if (fs1 < 0)
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
211 fs1 = 0;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
212 if (fs1 < s1) {
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
213 s2 -= s1 - fs1;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
214 s1 = fs1;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
215 }
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
216 }
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
217
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
218 post_context_calculation:
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
219 lctx = xecfg->ctxlen;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
220 lctx = XDL_MIN(lctx, xe->xdf1.nrec - (xche->i1 + xche->chg1));
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
221 lctx = XDL_MIN(lctx, xe->xdf2.nrec - (xche->i2 + xche->chg2));
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
222
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
223 e1 = xche->i1 + xche->chg1 + lctx;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
224 e2 = xche->i2 + xche->chg2 + lctx;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
225
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
226 if (xecfg->flags & XDL_EMIT_FUNCCONTEXT) {
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
227 long fe1 = get_func_line(xe, xecfg, NULL,
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
228 xche->i1 + xche->chg1,
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
229 xe->xdf1.nrec);
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
230 while (fe1 > 0 && is_empty_rec(&xe->xdf1, fe1 - 1))
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
231 fe1--;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
232 if (fe1 < 0)
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
233 fe1 = xe->xdf1.nrec;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
234 if (fe1 > e1) {
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
235 e2 += fe1 - e1;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
236 e1 = fe1;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
237 }
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
238
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
239 /*
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
240 * Overlap with next change? Then include it
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
241 * in the current hunk and start over to find
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
242 * its new end.
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
243 */
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
244 if (xche->next) {
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
245 long l = XDL_MIN(xche->next->i1,
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
246 xe->xdf1.nrec - 1);
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
247 if (l - xecfg->ctxlen <= e1 ||
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
248 get_func_line(xe, xecfg, NULL, l, e1) < 0) {
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
249 xche = xche->next;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
250 goto post_context_calculation;
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
parents:
diff changeset
251 }
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
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252 }
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253 }
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254
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255 /*
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256 * Emit current hunk header.
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257 */
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258
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259 if (xecfg->flags & XDL_EMIT_FUNCNAMES) {
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260 get_func_line(xe, xecfg, &func_line,
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261 s1 - 1, funclineprev);
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262 funclineprev = s1 - 1;
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263 }
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264 if (xdl_emit_hunk_hdr(s1 + 1, e1 - s1, s2 + 1, e2 - s2,
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265 func_line.buf, func_line.len, ecb) < 0)
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266 return -1;
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267
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268 /*
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269 * Emit pre-context.
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270 */
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271 for (; s2 < xch->i2; s2++)
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272 if (xdl_emit_record(&xe->xdf2, s2, " ", ecb) < 0)
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273 return -1;
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parents:
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274
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275 for (s1 = xch->i1, s2 = xch->i2;; xch = xch->next) {
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276 /*
195e8b1fcbbf patch 8.1.0360: using an external diff program is slow and inflexible
Christian Brabandt <cb@256bit.org>
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277 * Merge previous with current change atom.
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Christian Brabandt <cb@256bit.org>
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diff changeset
278 */
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279 for (; s1 < xch->i1 && s2 < xch->i2; s1++, s2++)
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280 if (xdl_emit_record(&xe->xdf2, s2, " ", ecb) < 0)
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281 return -1;
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282
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283 /*
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284 * Removes lines from the first file.
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285 */
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286 for (s1 = xch->i1; s1 < xch->i1 + xch->chg1; s1++)
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287 if (xdl_emit_record(&xe->xdf1, s1, "-", ecb) < 0)
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288 return -1;
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289
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290 /*
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291 * Adds lines from the second file.
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292 */
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293 for (s2 = xch->i2; s2 < xch->i2 + xch->chg2; s2++)
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294 if (xdl_emit_record(&xe->xdf2, s2, "+", ecb) < 0)
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295 return -1;
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296
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297 if (xch == xche)
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298 break;
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299 s1 = xch->i1 + xch->chg1;
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300 s2 = xch->i2 + xch->chg2;
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301 }
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302
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parents:
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303 /*
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304 * Emit post-context.
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305 */
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parents:
diff changeset
306 for (s2 = xche->i2 + xche->chg2; s2 < e2; s2++)
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diff changeset
307 if (xdl_emit_record(&xe->xdf2, s2, " ", ecb) < 0)
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parents:
diff changeset
308 return -1;
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parents:
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309 }
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parents:
diff changeset
310
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311 return 0;
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312 }