[1765] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Mini diff implementation for busybox, adapted from OpenBSD diff.
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| 4 | *
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| 5 | * Copyright (C) 2006 by Robert Sullivan <cogito.ergo.cogito@hotmail.com>
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| 6 | * Copyright (c) 2003 Todd C. Miller <Todd.Miller@courtesan.com>
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| 7 | *
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| 8 | * Sponsored in part by the Defense Advanced Research Projects
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| 9 | * Agency (DARPA) and Air Force Research Laboratory, Air Force
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| 10 | * Materiel Command, USAF, under agreement number F39502-99-1-0512.
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| 11 | *
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| 12 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 13 | */
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| 14 |
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| 15 | #include "libbb.h"
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| 16 |
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| 17 | #define FSIZE_MAX 32768
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| 18 |
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| 19 | /*
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| 20 | * Output flags
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| 21 | */
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| 22 | #define D_HEADER 1 /* Print a header/footer between files */
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| 23 | #define D_EMPTY1 2 /* Treat first file as empty (/dev/null) */
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| 24 | #define D_EMPTY2 4 /* Treat second file as empty (/dev/null) */
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| 25 |
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| 26 | /*
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| 27 | * Status values for print_status() and diffreg() return values
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| 28 | * Guide:
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| 29 | * D_SAME - files are the same
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| 30 | * D_DIFFER - files differ
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| 31 | * D_BINARY - binary files differ
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| 32 | * D_COMMON - subdirectory common to both dirs
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| 33 | * D_ONLY - file only exists in one dir
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| 34 | * D_MISMATCH1 - path1 a dir, path2 a file
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| 35 | * D_MISMATCH2 - path1 a file, path2 a dir
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| 36 | * D_ERROR - error occurred
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| 37 | * D_SKIPPED1 - skipped path1 as it is a special file
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| 38 | * D_SKIPPED2 - skipped path2 as it is a special file
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| 39 | */
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| 40 |
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| 41 | #define D_SAME 0
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| 42 | #define D_DIFFER (1<<0)
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| 43 | #define D_BINARY (1<<1)
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| 44 | #define D_COMMON (1<<2)
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| 45 | #define D_ONLY (1<<3)
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| 46 | #define D_MISMATCH1 (1<<4)
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| 47 | #define D_MISMATCH2 (1<<5)
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| 48 | #define D_ERROR (1<<6)
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| 49 | #define D_SKIPPED1 (1<<7)
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| 50 | #define D_SKIPPED2 (1<<8)
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| 51 |
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| 52 | /* Command line options */
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| 53 | #define FLAG_a (1<<0)
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| 54 | #define FLAG_b (1<<1)
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| 55 | #define FLAG_d (1<<2)
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| 56 | #define FLAG_i (1<<3)
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| 57 | #define FLAG_L (1<<4)
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| 58 | #define FLAG_N (1<<5)
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| 59 | #define FLAG_q (1<<6)
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| 60 | #define FLAG_r (1<<7)
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| 61 | #define FLAG_s (1<<8)
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| 62 | #define FLAG_S (1<<9)
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| 63 | #define FLAG_t (1<<10)
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| 64 | #define FLAG_T (1<<11)
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| 65 | #define FLAG_U (1<<12)
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| 66 | #define FLAG_w (1<<13)
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| 67 |
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| 68 | #define g_read_buf bb_common_bufsiz1
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| 69 |
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| 70 | struct cand {
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| 71 | int x;
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| 72 | int y;
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| 73 | int pred;
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| 74 | };
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| 75 |
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| 76 | struct line {
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| 77 | int serial;
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| 78 | int value;
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| 79 | };
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| 80 |
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| 81 | /*
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| 82 | * The following struct is used to record change information
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| 83 | * doing a "context" or "unified" diff. (see routine "change" to
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| 84 | * understand the highly mnemonic field names)
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| 85 | */
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| 86 | struct context_vec {
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| 87 | int a; /* start line in old file */
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| 88 | int b; /* end line in old file */
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| 89 | int c; /* start line in new file */
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| 90 | int d; /* end line in new file */
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| 91 | };
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| 92 |
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| 93 | struct globals {
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| 94 | USE_FEATURE_DIFF_DIR(char **dl;)
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| 95 | USE_FEATURE_DIFF_DIR(int dl_count;)
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| 96 | /* This is the default number of lines of context. */
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| 97 | int context;
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| 98 | size_t max_context;
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| 99 | int status;
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| 100 | char *start;
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| 101 | const char *label1;
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| 102 | const char *label2;
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| 103 | struct line *file[2];
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| 104 | int *J; /* will be overlaid on class */
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| 105 | int *class; /* will be overlaid on file[0] */
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| 106 | int *klist; /* will be overlaid on file[0] after class */
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| 107 | int *member; /* will be overlaid on file[1] */
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| 108 | int clen;
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| 109 | int len[2];
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| 110 | int pref, suff; /* length of prefix and suffix */
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| 111 | int slen[2];
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| 112 | bool anychange;
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| 113 | long *ixnew; /* will be overlaid on file[1] */
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| 114 | long *ixold; /* will be overlaid on klist */
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| 115 | struct cand *clist; /* merely a free storage pot for candidates */
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| 116 | int clistlen; /* the length of clist */
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| 117 | struct line *sfile[2]; /* shortened by pruning common prefix/suffix */
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| 118 | struct context_vec *context_vec_start;
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| 119 | struct context_vec *context_vec_end;
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| 120 | struct context_vec *context_vec_ptr;
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| 121 | struct stat stb1, stb2;
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| 122 | };
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| 123 | #define G (*ptr_to_globals)
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| 124 | #define dl (G.dl )
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| 125 | #define dl_count (G.dl_count )
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| 126 | #define context (G.context )
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| 127 | #define max_context (G.max_context )
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| 128 | #define status (G.status )
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| 129 | #define start (G.start )
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| 130 | #define label1 (G.label1 )
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| 131 | #define label2 (G.label2 )
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| 132 | #define file (G.file )
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| 133 | #define J (G.J )
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| 134 | #define class (G.class )
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| 135 | #define klist (G.klist )
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| 136 | #define member (G.member )
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| 137 | #define clen (G.clen )
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| 138 | #define len (G.len )
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| 139 | #define pref (G.pref )
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| 140 | #define suff (G.suff )
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| 141 | #define slen (G.slen )
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| 142 | #define anychange (G.anychange )
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| 143 | #define ixnew (G.ixnew )
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| 144 | #define ixold (G.ixold )
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| 145 | #define clist (G.clist )
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| 146 | #define clistlen (G.clistlen )
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| 147 | #define sfile (G.sfile )
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| 148 | #define context_vec_start (G.context_vec_start )
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| 149 | #define context_vec_end (G.context_vec_end )
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| 150 | #define context_vec_ptr (G.context_vec_ptr )
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| 151 | #define stb1 (G.stb1 )
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| 152 | #define stb2 (G.stb2 )
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| 153 | #define INIT_G() do { \
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| 154 | PTR_TO_GLOBALS = xzalloc(sizeof(G)); \
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| 155 | context = 3; \
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| 156 | max_context = 64; \
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| 157 | } while (0)
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| 158 |
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| 159 |
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| 160 | static void print_only(const char *path, size_t dirlen, const char *entry)
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| 161 | {
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| 162 | if (dirlen > 1)
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| 163 | dirlen--;
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| 164 | printf("Only in %.*s: %s\n", (int) dirlen, path, entry);
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| 165 | }
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| 166 |
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| 167 | static void print_status(int val, char *path1, char *path2, char *entry)
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| 168 | {
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| 169 | const char *const _entry = entry ? entry : "";
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| 170 | char * const _path1 = entry ? concat_path_file(path1, _entry) : path1;
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| 171 | char * const _path2 = entry ? concat_path_file(path2, _entry) : path2;
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| 172 |
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| 173 | switch (val) {
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| 174 | case D_ONLY:
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| 175 | print_only(path1, strlen(path1), entry);
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| 176 | break;
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| 177 | case D_COMMON:
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| 178 | printf("Common subdirectories: %s and %s\n", _path1, _path2);
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| 179 | break;
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| 180 | case D_BINARY:
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| 181 | printf("Binary files %s and %s differ\n", _path1, _path2);
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| 182 | break;
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| 183 | case D_DIFFER:
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| 184 | if (option_mask32 & FLAG_q)
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| 185 | printf("Files %s and %s differ\n", _path1, _path2);
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| 186 | break;
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| 187 | case D_SAME:
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| 188 | if (option_mask32 & FLAG_s)
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| 189 | printf("Files %s and %s are identical\n", _path1, _path2);
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| 190 | break;
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| 191 | case D_MISMATCH1:
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| 192 | printf("File %s is a %s while file %s is a %s\n",
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| 193 | _path1, "directory", _path2, "regular file");
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| 194 | break;
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| 195 | case D_MISMATCH2:
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| 196 | printf("File %s is a %s while file %s is a %s\n",
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| 197 | _path1, "regular file", _path2, "directory");
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| 198 | break;
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| 199 | case D_SKIPPED1:
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| 200 | printf("File %s is not a regular file or directory and was skipped\n",
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| 201 | _path1);
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| 202 | break;
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| 203 | case D_SKIPPED2:
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| 204 | printf("File %s is not a regular file or directory and was skipped\n",
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| 205 | _path2);
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| 206 | break;
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| 207 | }
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| 208 | if (entry) {
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| 209 | free(_path1);
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| 210 | free(_path2);
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| 211 | }
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| 212 | }
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| 213 | static ALWAYS_INLINE int fiddle_sum(int sum, int t)
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| 214 | {
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| 215 | return sum * 127 + t;
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| 216 | }
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| 217 | /*
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| 218 | * Hash function taken from Robert Sedgewick, Algorithms in C, 3d ed., p 578.
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| 219 | */
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| 220 | static int readhash(FILE *fp)
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| 221 | {
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| 222 | int i, t, space;
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| 223 | int sum;
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| 224 |
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| 225 | sum = 1;
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| 226 | space = 0;
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| 227 | if (!(option_mask32 & (FLAG_b | FLAG_w))) {
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| 228 | for (i = 0; (t = getc(fp)) != '\n'; i++) {
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| 229 | if (t == EOF) {
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| 230 | if (i == 0)
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| 231 | return 0;
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| 232 | break;
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| 233 | }
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| 234 | sum = fiddle_sum(sum, t);
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| 235 | }
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| 236 | } else {
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| 237 | for (i = 0;;) {
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| 238 | switch (t = getc(fp)) {
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| 239 | case '\t':
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| 240 | case '\r':
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| 241 | case '\v':
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| 242 | case '\f':
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| 243 | case ' ':
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| 244 | space++;
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| 245 | continue;
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| 246 | default:
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| 247 | if (space && !(option_mask32 & FLAG_w)) {
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| 248 | i++;
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| 249 | space = 0;
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| 250 | }
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| 251 | sum = fiddle_sum(sum, t);
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| 252 | i++;
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| 253 | continue;
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| 254 | case EOF:
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| 255 | if (i == 0)
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| 256 | return 0;
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| 257 | /* FALLTHROUGH */
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| 258 | case '\n':
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| 259 | break;
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| 260 | }
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| 261 | break;
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| 262 | }
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| 263 | }
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| 264 | /*
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| 265 | * There is a remote possibility that we end up with a zero sum.
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| 266 | * Zero is used as an EOF marker, so return 1 instead.
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| 267 | */
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| 268 | return (sum == 0 ? 1 : sum);
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| 269 | }
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| 270 |
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| 271 |
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| 272 | /*
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| 273 | * Check to see if the given files differ.
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| 274 | * Returns 0 if they are the same, 1 if different, and -1 on error.
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| 275 | */
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| 276 | static int files_differ(FILE *f1, FILE *f2, int flags)
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| 277 | {
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| 278 | size_t i, j;
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| 279 |
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| 280 | if ((flags & (D_EMPTY1 | D_EMPTY2)) || stb1.st_size != stb2.st_size
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| 281 | || (stb1.st_mode & S_IFMT) != (stb2.st_mode & S_IFMT)
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| 282 | ) {
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| 283 | return 1;
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| 284 | }
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| 285 | while (1) {
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| 286 | i = fread(g_read_buf, 1, COMMON_BUFSIZE/2, f1);
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| 287 | j = fread(g_read_buf + COMMON_BUFSIZE/2, 1, COMMON_BUFSIZE/2, f2);
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| 288 | if (i != j)
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| 289 | return 1;
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| 290 | if (i == 0)
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| 291 | return (ferror(f1) || ferror(f2));
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| 292 | if (memcmp(g_read_buf,
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| 293 | g_read_buf + COMMON_BUFSIZE/2, i) != 0)
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| 294 | return 1;
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| 295 | }
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| 296 | }
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| 297 |
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| 298 |
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| 299 | static void prepare(int i, FILE *fp /*, off_t filesize*/)
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| 300 | {
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| 301 | struct line *p;
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| 302 | int h;
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| 303 | size_t j, sz;
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| 304 |
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| 305 | rewind(fp);
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| 306 |
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| 307 | /*sz = (filesize <= FSIZE_MAX ? filesize : FSIZE_MAX) / 25;*/
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| 308 | /*if (sz < 100)*/
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| 309 | sz = 100;
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| 310 |
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| 311 | p = xmalloc((sz + 3) * sizeof(p[0]));
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| 312 | j = 0;
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| 313 | while ((h = readhash(fp))) {
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| 314 | if (j == sz) {
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| 315 | sz = sz * 3 / 2;
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| 316 | p = xrealloc(p, (sz + 3) * sizeof(p[0]));
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| 317 | }
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| 318 | p[++j].value = h;
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| 319 | }
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| 320 | len[i] = j;
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| 321 | file[i] = p;
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| 322 | }
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| 323 |
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| 324 |
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| 325 | static void prune(void)
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| 326 | {
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| 327 | int i, j;
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| 328 |
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| 329 | for (pref = 0; pref < len[0] && pref < len[1] &&
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| 330 | file[0][pref + 1].value == file[1][pref + 1].value; pref++)
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| 331 | continue;
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| 332 | for (suff = 0; suff < len[0] - pref && suff < len[1] - pref &&
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| 333 | file[0][len[0] - suff].value == file[1][len[1] - suff].value;
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| 334 | suff++)
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| 335 | continue;
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| 336 | for (j = 0; j < 2; j++) {
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| 337 | sfile[j] = file[j] + pref;
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| 338 | slen[j] = len[j] - pref - suff;
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| 339 | for (i = 0; i <= slen[j]; i++)
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| 340 | sfile[j][i].serial = i;
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| 341 | }
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| 342 | }
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| 343 |
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| 344 |
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| 345 | static void equiv(struct line *a, int n, struct line *b, int m, int *c)
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| 346 | {
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| 347 | int i, j;
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| 348 |
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| 349 | i = j = 1;
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| 350 | while (i <= n && j <= m) {
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| 351 | if (a[i].value < b[j].value)
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| 352 | a[i++].value = 0;
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| 353 | else if (a[i].value == b[j].value)
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| 354 | a[i++].value = j;
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| 355 | else
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| 356 | j++;
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| 357 | }
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| 358 | while (i <= n)
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| 359 | a[i++].value = 0;
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| 360 | b[m + 1].value = 0;
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| 361 | j = 0;
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| 362 | while (++j <= m) {
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| 363 | c[j] = -b[j].serial;
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| 364 | while (b[j + 1].value == b[j].value) {
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| 365 | j++;
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| 366 | c[j] = b[j].serial;
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| 367 | }
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| 368 | }
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| 369 | c[j] = -1;
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| 370 | }
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| 371 |
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| 372 |
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| 373 | static int isqrt(int n)
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| 374 | {
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| 375 | int y, x;
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| 376 |
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| 377 | if (n == 0)
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| 378 | return 0;
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| 379 | x = 1;
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| 380 | do {
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| 381 | y = x;
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| 382 | x = n / x;
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| 383 | x += y;
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| 384 | x /= 2;
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| 385 | } while ((x - y) > 1 || (x - y) < -1);
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| 386 |
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| 387 | return x;
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| 388 | }
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| 389 |
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| 390 |
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| 391 | static int newcand(int x, int y, int pred)
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| 392 | {
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| 393 | struct cand *q;
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| 394 |
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| 395 | if (clen == clistlen) {
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| 396 | clistlen = clistlen * 11 / 10;
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| 397 | clist = xrealloc(clist, clistlen * sizeof(struct cand));
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| 398 | }
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| 399 | q = clist + clen;
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| 400 | q->x = x;
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| 401 | q->y = y;
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| 402 | q->pred = pred;
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| 403 | return clen++;
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| 404 | }
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| 405 |
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| 406 |
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| 407 | static int search(int *c, int k, int y)
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| 408 | {
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| 409 | int i, j, l, t;
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| 410 |
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| 411 | if (clist[c[k]].y < y) /* quick look for typical case */
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| 412 | return k + 1;
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| 413 | i = 0;
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| 414 | j = k + 1;
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| 415 | while (1) {
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| 416 | l = i + j;
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| 417 | if ((l >>= 1) <= i)
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| 418 | break;
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| 419 | t = clist[c[l]].y;
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| 420 | if (t > y)
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| 421 | j = l;
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| 422 | else if (t < y)
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| 423 | i = l;
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| 424 | else
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| 425 | return l;
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| 426 | }
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| 427 | return l + 1;
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| 428 | }
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| 429 |
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| 430 |
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| 431 | static int stone(int *a, int n, int *b, int *c)
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| 432 | {
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| 433 | int i, k, y, j, l;
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| 434 | int oldc, tc, oldl;
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| 435 | unsigned int numtries;
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| 436 |
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| 437 | #if ENABLE_FEATURE_DIFF_MINIMAL
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| 438 | const unsigned int bound =
|
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| 439 | (option_mask32 & FLAG_d) ? UINT_MAX : MAX(256, isqrt(n));
|
---|
| 440 | #else
|
---|
| 441 | const unsigned int bound = MAX(256, isqrt(n));
|
---|
| 442 | #endif
|
---|
| 443 | k = 0;
|
---|
| 444 | c[0] = newcand(0, 0, 0);
|
---|
| 445 | for (i = 1; i <= n; i++) {
|
---|
| 446 | j = a[i];
|
---|
| 447 | if (j == 0)
|
---|
| 448 | continue;
|
---|
| 449 | y = -b[j];
|
---|
| 450 | oldl = 0;
|
---|
| 451 | oldc = c[0];
|
---|
| 452 | numtries = 0;
|
---|
| 453 | do {
|
---|
| 454 | if (y <= clist[oldc].y)
|
---|
| 455 | continue;
|
---|
| 456 | l = search(c, k, y);
|
---|
| 457 | if (l != oldl + 1)
|
---|
| 458 | oldc = c[l - 1];
|
---|
| 459 | if (l <= k) {
|
---|
| 460 | if (clist[c[l]].y <= y)
|
---|
| 461 | continue;
|
---|
| 462 | tc = c[l];
|
---|
| 463 | c[l] = newcand(i, y, oldc);
|
---|
| 464 | oldc = tc;
|
---|
| 465 | oldl = l;
|
---|
| 466 | numtries++;
|
---|
| 467 | } else {
|
---|
| 468 | c[l] = newcand(i, y, oldc);
|
---|
| 469 | k++;
|
---|
| 470 | break;
|
---|
| 471 | }
|
---|
| 472 | } while ((y = b[++j]) > 0 && numtries < bound);
|
---|
| 473 | }
|
---|
| 474 | return k;
|
---|
| 475 | }
|
---|
| 476 |
|
---|
| 477 |
|
---|
| 478 | static void unravel(int p)
|
---|
| 479 | {
|
---|
| 480 | struct cand *q;
|
---|
| 481 | int i;
|
---|
| 482 |
|
---|
| 483 | for (i = 0; i <= len[0]; i++)
|
---|
| 484 | J[i] = i <= pref ? i : i > len[0] - suff ? i + len[1] - len[0] : 0;
|
---|
| 485 | for (q = clist + p; q->y != 0; q = clist + q->pred)
|
---|
| 486 | J[q->x + pref] = q->y + pref;
|
---|
| 487 | }
|
---|
| 488 |
|
---|
| 489 |
|
---|
| 490 | static void unsort(struct line *f, int l, int *b)
|
---|
| 491 | {
|
---|
| 492 | int *a, i;
|
---|
| 493 |
|
---|
| 494 | a = xmalloc((l + 1) * sizeof(int));
|
---|
| 495 | for (i = 1; i <= l; i++)
|
---|
| 496 | a[f[i].serial] = f[i].value;
|
---|
| 497 | for (i = 1; i <= l; i++)
|
---|
| 498 | b[i] = a[i];
|
---|
| 499 | free(a);
|
---|
| 500 | }
|
---|
| 501 |
|
---|
| 502 |
|
---|
| 503 | static int skipline(FILE * f)
|
---|
| 504 | {
|
---|
| 505 | int i, c;
|
---|
| 506 |
|
---|
| 507 | for (i = 1; (c = getc(f)) != '\n' && c != EOF; i++)
|
---|
| 508 | continue;
|
---|
| 509 | return i;
|
---|
| 510 | }
|
---|
| 511 |
|
---|
| 512 |
|
---|
| 513 | /*
|
---|
| 514 | * Check does double duty:
|
---|
| 515 | * 1. ferret out any fortuitous correspondences due
|
---|
| 516 | * to confounding by hashing (which result in "jackpot")
|
---|
| 517 | * 2. collect random access indexes to the two files
|
---|
| 518 | */
|
---|
| 519 | static void check(FILE * f1, FILE * f2)
|
---|
| 520 | {
|
---|
| 521 | int i, j, jackpot, c, d;
|
---|
| 522 | long ctold, ctnew;
|
---|
| 523 |
|
---|
| 524 | rewind(f1);
|
---|
| 525 | rewind(f2);
|
---|
| 526 | j = 1;
|
---|
| 527 | ixold[0] = ixnew[0] = 0;
|
---|
| 528 | jackpot = 0;
|
---|
| 529 | ctold = ctnew = 0;
|
---|
| 530 | for (i = 1; i <= len[0]; i++) {
|
---|
| 531 | if (J[i] == 0) {
|
---|
| 532 | ixold[i] = ctold += skipline(f1);
|
---|
| 533 | continue;
|
---|
| 534 | }
|
---|
| 535 | while (j < J[i]) {
|
---|
| 536 | ixnew[j] = ctnew += skipline(f2);
|
---|
| 537 | j++;
|
---|
| 538 | }
|
---|
| 539 | if ((option_mask32 & FLAG_b) || (option_mask32 & FLAG_w)
|
---|
| 540 | || (option_mask32 & FLAG_i)) {
|
---|
| 541 | while (1) {
|
---|
| 542 | c = getc(f1);
|
---|
| 543 | d = getc(f2);
|
---|
| 544 | /*
|
---|
| 545 | * GNU diff ignores a missing newline
|
---|
| 546 | * in one file if bflag || wflag.
|
---|
| 547 | */
|
---|
| 548 | if (((option_mask32 & FLAG_b) || (option_mask32 & FLAG_w)) &&
|
---|
| 549 | ((c == EOF && d == '\n') || (c == '\n' && d == EOF))) {
|
---|
| 550 | break;
|
---|
| 551 | }
|
---|
| 552 | ctold++;
|
---|
| 553 | ctnew++;
|
---|
| 554 | if ((option_mask32 & FLAG_b) && isspace(c) && isspace(d)) {
|
---|
| 555 | do {
|
---|
| 556 | if (c == '\n')
|
---|
| 557 | break;
|
---|
| 558 | ctold++;
|
---|
| 559 | } while (isspace(c = getc(f1)));
|
---|
| 560 | do {
|
---|
| 561 | if (d == '\n')
|
---|
| 562 | break;
|
---|
| 563 | ctnew++;
|
---|
| 564 | } while (isspace(d = getc(f2)));
|
---|
| 565 | } else if (option_mask32 & FLAG_w) {
|
---|
| 566 | while (isspace(c) && c != '\n') {
|
---|
| 567 | c = getc(f1);
|
---|
| 568 | ctold++;
|
---|
| 569 | }
|
---|
| 570 | while (isspace(d) && d != '\n') {
|
---|
| 571 | d = getc(f2);
|
---|
| 572 | ctnew++;
|
---|
| 573 | }
|
---|
| 574 | }
|
---|
| 575 | if (c != d) {
|
---|
| 576 | jackpot++;
|
---|
| 577 | J[i] = 0;
|
---|
| 578 | if (c != '\n' && c != EOF)
|
---|
| 579 | ctold += skipline(f1);
|
---|
| 580 | if (d != '\n' && c != EOF)
|
---|
| 581 | ctnew += skipline(f2);
|
---|
| 582 | break;
|
---|
| 583 | }
|
---|
| 584 | if (c == '\n' || c == EOF)
|
---|
| 585 | break;
|
---|
| 586 | }
|
---|
| 587 | } else {
|
---|
| 588 | while (1) {
|
---|
| 589 | ctold++;
|
---|
| 590 | ctnew++;
|
---|
| 591 | if ((c = getc(f1)) != (d = getc(f2))) {
|
---|
| 592 | J[i] = 0;
|
---|
| 593 | if (c != '\n' && c != EOF)
|
---|
| 594 | ctold += skipline(f1);
|
---|
| 595 | if (d != '\n' && c != EOF)
|
---|
| 596 | ctnew += skipline(f2);
|
---|
| 597 | break;
|
---|
| 598 | }
|
---|
| 599 | if (c == '\n' || c == EOF)
|
---|
| 600 | break;
|
---|
| 601 | }
|
---|
| 602 | }
|
---|
| 603 | ixold[i] = ctold;
|
---|
| 604 | ixnew[j] = ctnew;
|
---|
| 605 | j++;
|
---|
| 606 | }
|
---|
| 607 | for (; j <= len[1]; j++)
|
---|
| 608 | ixnew[j] = ctnew += skipline(f2);
|
---|
| 609 | }
|
---|
| 610 |
|
---|
| 611 |
|
---|
| 612 | /* shellsort CACM #201 */
|
---|
| 613 | static void sort(struct line *a, int n)
|
---|
| 614 | {
|
---|
| 615 | struct line *ai, *aim, w;
|
---|
| 616 | int j, m = 0, k;
|
---|
| 617 |
|
---|
| 618 | if (n == 0)
|
---|
| 619 | return;
|
---|
| 620 | for (j = 1; j <= n; j *= 2)
|
---|
| 621 | m = 2 * j - 1;
|
---|
| 622 | for (m /= 2; m != 0; m /= 2) {
|
---|
| 623 | k = n - m;
|
---|
| 624 | for (j = 1; j <= k; j++) {
|
---|
| 625 | for (ai = &a[j]; ai > a; ai -= m) {
|
---|
| 626 | aim = &ai[m];
|
---|
| 627 | if (aim < ai)
|
---|
| 628 | break; /* wraparound */
|
---|
| 629 | if (aim->value > ai[0].value ||
|
---|
| 630 | (aim->value == ai[0].value && aim->serial > ai[0].serial))
|
---|
| 631 | break;
|
---|
| 632 | w.value = ai[0].value;
|
---|
| 633 | ai[0].value = aim->value;
|
---|
| 634 | aim->value = w.value;
|
---|
| 635 | w.serial = ai[0].serial;
|
---|
| 636 | ai[0].serial = aim->serial;
|
---|
| 637 | aim->serial = w.serial;
|
---|
| 638 | }
|
---|
| 639 | }
|
---|
| 640 | }
|
---|
| 641 | }
|
---|
| 642 |
|
---|
| 643 |
|
---|
| 644 | static void uni_range(int a, int b)
|
---|
| 645 | {
|
---|
| 646 | if (a < b)
|
---|
| 647 | printf("%d,%d", a, b - a + 1);
|
---|
| 648 | else if (a == b)
|
---|
| 649 | printf("%d", b);
|
---|
| 650 | else
|
---|
| 651 | printf("%d,0", b);
|
---|
| 652 | }
|
---|
| 653 |
|
---|
| 654 |
|
---|
| 655 | static void fetch(long *f, int a, int b, FILE * lb, int ch)
|
---|
| 656 | {
|
---|
| 657 | int i, j, c, lastc, col, nc;
|
---|
| 658 |
|
---|
| 659 | if (a > b)
|
---|
| 660 | return;
|
---|
| 661 | for (i = a; i <= b; i++) {
|
---|
| 662 | fseek(lb, f[i - 1], SEEK_SET);
|
---|
| 663 | nc = f[i] - f[i - 1];
|
---|
| 664 | if (ch != '\0') {
|
---|
| 665 | putchar(ch);
|
---|
| 666 | if (option_mask32 & FLAG_T)
|
---|
| 667 | putchar('\t');
|
---|
| 668 | }
|
---|
| 669 | col = 0;
|
---|
| 670 | for (j = 0, lastc = '\0'; j < nc; j++, lastc = c) {
|
---|
| 671 | if ((c = getc(lb)) == EOF) {
|
---|
| 672 | printf("\n\\ No newline at end of file\n");
|
---|
| 673 | return;
|
---|
| 674 | }
|
---|
| 675 | if (c == '\t' && (option_mask32 & FLAG_t)) {
|
---|
| 676 | do {
|
---|
| 677 | putchar(' ');
|
---|
| 678 | } while (++col & 7);
|
---|
| 679 | } else {
|
---|
| 680 | putchar(c);
|
---|
| 681 | col++;
|
---|
| 682 | }
|
---|
| 683 | }
|
---|
| 684 | }
|
---|
| 685 | }
|
---|
| 686 |
|
---|
| 687 |
|
---|
| 688 | static int asciifile(FILE * f)
|
---|
| 689 | {
|
---|
| 690 | #if ENABLE_FEATURE_DIFF_BINARY
|
---|
| 691 | int i, cnt;
|
---|
| 692 | #endif
|
---|
| 693 |
|
---|
| 694 | if ((option_mask32 & FLAG_a) || f == NULL)
|
---|
| 695 | return 1;
|
---|
| 696 |
|
---|
| 697 | #if ENABLE_FEATURE_DIFF_BINARY
|
---|
| 698 | rewind(f);
|
---|
| 699 | cnt = fread(g_read_buf, 1, COMMON_BUFSIZE, f);
|
---|
| 700 | for (i = 0; i < cnt; i++) {
|
---|
| 701 | if (!isprint(g_read_buf[i])
|
---|
| 702 | && !isspace(g_read_buf[i])) {
|
---|
| 703 | return 0;
|
---|
| 704 | }
|
---|
| 705 | }
|
---|
| 706 | #endif
|
---|
| 707 | return 1;
|
---|
| 708 | }
|
---|
| 709 |
|
---|
| 710 |
|
---|
| 711 | /* dump accumulated "unified" diff changes */
|
---|
| 712 | static void dump_unified_vec(FILE * f1, FILE * f2)
|
---|
| 713 | {
|
---|
| 714 | struct context_vec *cvp = context_vec_start;
|
---|
| 715 | int lowa, upb, lowc, upd;
|
---|
| 716 | int a, b, c, d;
|
---|
| 717 | char ch;
|
---|
| 718 |
|
---|
| 719 | if (context_vec_start > context_vec_ptr)
|
---|
| 720 | return;
|
---|
| 721 |
|
---|
| 722 | b = d = 0; /* gcc */
|
---|
| 723 | lowa = MAX(1, cvp->a - context);
|
---|
| 724 | upb = MIN(len[0], context_vec_ptr->b + context);
|
---|
| 725 | lowc = MAX(1, cvp->c - context);
|
---|
| 726 | upd = MIN(len[1], context_vec_ptr->d + context);
|
---|
| 727 |
|
---|
| 728 | printf("@@ -");
|
---|
| 729 | uni_range(lowa, upb);
|
---|
| 730 | printf(" +");
|
---|
| 731 | uni_range(lowc, upd);
|
---|
| 732 | printf(" @@\n");
|
---|
| 733 |
|
---|
| 734 | /*
|
---|
| 735 | * Output changes in "unified" diff format--the old and new lines
|
---|
| 736 | * are printed together.
|
---|
| 737 | */
|
---|
| 738 | for (; cvp <= context_vec_ptr; cvp++) {
|
---|
| 739 | a = cvp->a;
|
---|
| 740 | b = cvp->b;
|
---|
| 741 | c = cvp->c;
|
---|
| 742 | d = cvp->d;
|
---|
| 743 |
|
---|
| 744 | /*
|
---|
| 745 | * c: both new and old changes
|
---|
| 746 | * d: only changes in the old file
|
---|
| 747 | * a: only changes in the new file
|
---|
| 748 | */
|
---|
| 749 | if (a <= b && c <= d)
|
---|
| 750 | ch = 'c';
|
---|
| 751 | else
|
---|
| 752 | ch = (a <= b) ? 'd' : 'a';
|
---|
| 753 | #if 0
|
---|
| 754 | switch (ch) {
|
---|
| 755 | case 'c':
|
---|
| 756 | fetch(ixold, lowa, a - 1, f1, ' ');
|
---|
| 757 | fetch(ixold, a, b, f1, '-');
|
---|
| 758 | fetch(ixnew, c, d, f2, '+');
|
---|
| 759 | break;
|
---|
| 760 | case 'd':
|
---|
| 761 | fetch(ixold, lowa, a - 1, f1, ' ');
|
---|
| 762 | fetch(ixold, a, b, f1, '-');
|
---|
| 763 | break;
|
---|
| 764 | case 'a':
|
---|
| 765 | fetch(ixnew, lowc, c - 1, f2, ' ');
|
---|
| 766 | fetch(ixnew, c, d, f2, '+');
|
---|
| 767 | break;
|
---|
| 768 | }
|
---|
| 769 | #else
|
---|
| 770 | if (ch == 'c' || ch == 'd') {
|
---|
| 771 | fetch(ixold, lowa, a - 1, f1, ' ');
|
---|
| 772 | fetch(ixold, a, b, f1, '-');
|
---|
| 773 | }
|
---|
| 774 | if (ch == 'a')
|
---|
| 775 | fetch(ixnew, lowc, c - 1, f2, ' ');
|
---|
| 776 | if (ch == 'c' || ch == 'a')
|
---|
| 777 | fetch(ixnew, c, d, f2, '+');
|
---|
| 778 | #endif
|
---|
| 779 | lowa = b + 1;
|
---|
| 780 | lowc = d + 1;
|
---|
| 781 | }
|
---|
| 782 | fetch(ixnew, d + 1, upd, f2, ' ');
|
---|
| 783 |
|
---|
| 784 | context_vec_ptr = context_vec_start - 1;
|
---|
| 785 | }
|
---|
| 786 |
|
---|
| 787 |
|
---|
| 788 | static void print_header(const char *file1, const char *file2)
|
---|
| 789 | {
|
---|
| 790 | if (label1)
|
---|
| 791 | printf("--- %s\n", label1);
|
---|
| 792 | else
|
---|
| 793 | printf("--- %s\t%s", file1, ctime(&stb1.st_mtime));
|
---|
| 794 | if (label2)
|
---|
| 795 | printf("+++ %s\n", label2);
|
---|
| 796 | else
|
---|
| 797 | printf("+++ %s\t%s", file2, ctime(&stb2.st_mtime));
|
---|
| 798 | }
|
---|
| 799 |
|
---|
| 800 |
|
---|
| 801 | /*
|
---|
| 802 | * Indicate that there is a difference between lines a and b of the from file
|
---|
| 803 | * to get to lines c to d of the to file. If a is greater than b then there
|
---|
| 804 | * are no lines in the from file involved and this means that there were
|
---|
| 805 | * lines appended (beginning at b). If c is greater than d then there are
|
---|
| 806 | * lines missing from the to file.
|
---|
| 807 | */
|
---|
| 808 | static void change(char *file1, FILE * f1, char *file2, FILE * f2, int a,
|
---|
| 809 | int b, int c, int d)
|
---|
| 810 | {
|
---|
| 811 | if ((a > b && c > d) || (option_mask32 & FLAG_q)) {
|
---|
| 812 | anychange = 1;
|
---|
| 813 | return;
|
---|
| 814 | }
|
---|
| 815 |
|
---|
| 816 | /*
|
---|
| 817 | * Allocate change records as needed.
|
---|
| 818 | */
|
---|
| 819 | if (context_vec_ptr == context_vec_end - 1) {
|
---|
| 820 | ptrdiff_t offset = context_vec_ptr - context_vec_start;
|
---|
| 821 |
|
---|
| 822 | max_context <<= 1;
|
---|
| 823 | context_vec_start = xrealloc(context_vec_start,
|
---|
| 824 | max_context * sizeof(struct context_vec));
|
---|
| 825 | context_vec_end = context_vec_start + max_context;
|
---|
| 826 | context_vec_ptr = context_vec_start + offset;
|
---|
| 827 | }
|
---|
| 828 | if (anychange == 0) {
|
---|
| 829 | /*
|
---|
| 830 | * Print the context/unidiff header first time through.
|
---|
| 831 | */
|
---|
| 832 | print_header(file1, file2);
|
---|
| 833 | } else if (a > context_vec_ptr->b + (2 * context) + 1 &&
|
---|
| 834 | c > context_vec_ptr->d + (2 * context) + 1) {
|
---|
| 835 | /*
|
---|
| 836 | * If this change is more than 'context' lines from the
|
---|
| 837 | * previous change, dump the record and reset it.
|
---|
| 838 | */
|
---|
| 839 | dump_unified_vec(f1, f2);
|
---|
| 840 | }
|
---|
| 841 | context_vec_ptr++;
|
---|
| 842 | context_vec_ptr->a = a;
|
---|
| 843 | context_vec_ptr->b = b;
|
---|
| 844 | context_vec_ptr->c = c;
|
---|
| 845 | context_vec_ptr->d = d;
|
---|
| 846 | anychange = 1;
|
---|
| 847 | }
|
---|
| 848 |
|
---|
| 849 |
|
---|
| 850 | static void output(char *file1, FILE * f1, char *file2, FILE * f2)
|
---|
| 851 | {
|
---|
| 852 | /* Note that j0 and j1 can't be used as they are defined in math.h.
|
---|
| 853 | * This also allows the rather amusing variable 'j00'... */
|
---|
| 854 | int m, i0, i1, j00, j01;
|
---|
| 855 |
|
---|
| 856 | rewind(f1);
|
---|
| 857 | rewind(f2);
|
---|
| 858 | m = len[0];
|
---|
| 859 | J[0] = 0;
|
---|
| 860 | J[m + 1] = len[1] + 1;
|
---|
| 861 | for (i0 = 1; i0 <= m; i0 = i1 + 1) {
|
---|
| 862 | while (i0 <= m && J[i0] == J[i0 - 1] + 1)
|
---|
| 863 | i0++;
|
---|
| 864 | j00 = J[i0 - 1] + 1;
|
---|
| 865 | i1 = i0 - 1;
|
---|
| 866 | while (i1 < m && J[i1 + 1] == 0)
|
---|
| 867 | i1++;
|
---|
| 868 | j01 = J[i1 + 1] - 1;
|
---|
| 869 | J[i1] = j01;
|
---|
| 870 | change(file1, f1, file2, f2, i0, i1, j00, j01);
|
---|
| 871 | }
|
---|
| 872 | if (m == 0) {
|
---|
| 873 | change(file1, f1, file2, f2, 1, 0, 1, len[1]);
|
---|
| 874 | }
|
---|
| 875 | if (anychange != 0 && !(option_mask32 & FLAG_q)) {
|
---|
| 876 | dump_unified_vec(f1, f2);
|
---|
| 877 | }
|
---|
| 878 | }
|
---|
| 879 |
|
---|
| 880 | /*
|
---|
| 881 | * The following code uses an algorithm due to Harold Stone,
|
---|
| 882 | * which finds a pair of longest identical subsequences in
|
---|
| 883 | * the two files.
|
---|
| 884 | *
|
---|
| 885 | * The major goal is to generate the match vector J.
|
---|
| 886 | * J[i] is the index of the line in file1 corresponding
|
---|
| 887 | * to line i file0. J[i] = 0 if there is no
|
---|
| 888 | * such line in file1.
|
---|
| 889 | *
|
---|
| 890 | * Lines are hashed so as to work in core. All potential
|
---|
| 891 | * matches are located by sorting the lines of each file
|
---|
| 892 | * on the hash (called ``value''). In particular, this
|
---|
| 893 | * collects the equivalence classes in file1 together.
|
---|
| 894 | * Subroutine equiv replaces the value of each line in
|
---|
| 895 | * file0 by the index of the first element of its
|
---|
| 896 | * matching equivalence in (the reordered) file1.
|
---|
| 897 | * To save space equiv squeezes file1 into a single
|
---|
| 898 | * array member in which the equivalence classes
|
---|
| 899 | * are simply concatenated, except that their first
|
---|
| 900 | * members are flagged by changing sign.
|
---|
| 901 | *
|
---|
| 902 | * Next the indices that point into member are unsorted into
|
---|
| 903 | * array class according to the original order of file0.
|
---|
| 904 | *
|
---|
| 905 | * The cleverness lies in routine stone. This marches
|
---|
| 906 | * through the lines of file0, developing a vector klist
|
---|
| 907 | * of "k-candidates". At step i a k-candidate is a matched
|
---|
| 908 | * pair of lines x,y (x in file0 y in file1) such that
|
---|
| 909 | * there is a common subsequence of length k
|
---|
| 910 | * between the first i lines of file0 and the first y
|
---|
| 911 | * lines of file1, but there is no such subsequence for
|
---|
| 912 | * any smaller y. x is the earliest possible mate to y
|
---|
| 913 | * that occurs in such a subsequence.
|
---|
| 914 | *
|
---|
| 915 | * Whenever any of the members of the equivalence class of
|
---|
| 916 | * lines in file1 matable to a line in file0 has serial number
|
---|
| 917 | * less than the y of some k-candidate, that k-candidate
|
---|
| 918 | * with the smallest such y is replaced. The new
|
---|
| 919 | * k-candidate is chained (via pred) to the current
|
---|
| 920 | * k-1 candidate so that the actual subsequence can
|
---|
| 921 | * be recovered. When a member has serial number greater
|
---|
| 922 | * that the y of all k-candidates, the klist is extended.
|
---|
| 923 | * At the end, the longest subsequence is pulled out
|
---|
| 924 | * and placed in the array J by unravel
|
---|
| 925 | *
|
---|
| 926 | * With J in hand, the matches there recorded are
|
---|
| 927 | * checked against reality to assure that no spurious
|
---|
| 928 | * matches have crept in due to hashing. If they have,
|
---|
| 929 | * they are broken, and "jackpot" is recorded--a harmless
|
---|
| 930 | * matter except that a true match for a spuriously
|
---|
| 931 | * mated line may now be unnecessarily reported as a change.
|
---|
| 932 | *
|
---|
| 933 | * Much of the complexity of the program comes simply
|
---|
| 934 | * from trying to minimize core utilization and
|
---|
| 935 | * maximize the range of doable problems by dynamically
|
---|
| 936 | * allocating what is needed and reusing what is not.
|
---|
| 937 | * The core requirements for problems larger than somewhat
|
---|
| 938 | * are (in words) 2*length(file0) + length(file1) +
|
---|
| 939 | * 3*(number of k-candidates installed), typically about
|
---|
| 940 | * 6n words for files of length n.
|
---|
| 941 | */
|
---|
| 942 | static unsigned diffreg(char *ofile1, char *ofile2, int flags)
|
---|
| 943 | {
|
---|
| 944 | char *file1 = ofile1;
|
---|
| 945 | char *file2 = ofile2;
|
---|
| 946 | FILE *f1 = stdin, *f2 = stdin;
|
---|
| 947 | unsigned rval;
|
---|
| 948 | int i;
|
---|
| 949 |
|
---|
| 950 | anychange = 0;
|
---|
| 951 | context_vec_ptr = context_vec_start - 1;
|
---|
| 952 |
|
---|
| 953 | if (S_ISDIR(stb1.st_mode) != S_ISDIR(stb2.st_mode))
|
---|
| 954 | return (S_ISDIR(stb1.st_mode) ? D_MISMATCH1 : D_MISMATCH2);
|
---|
| 955 |
|
---|
| 956 | rval = D_SAME;
|
---|
| 957 |
|
---|
| 958 | if (LONE_DASH(file1) && LONE_DASH(file2))
|
---|
| 959 | goto closem;
|
---|
| 960 |
|
---|
| 961 | if (flags & D_EMPTY1)
|
---|
| 962 | f1 = xfopen(bb_dev_null, "r");
|
---|
| 963 | else if (NOT_LONE_DASH(file1))
|
---|
| 964 | f1 = xfopen(file1, "r");
|
---|
| 965 | if (flags & D_EMPTY2)
|
---|
| 966 | f2 = xfopen(bb_dev_null, "r");
|
---|
| 967 | else if (NOT_LONE_DASH(file2))
|
---|
| 968 | f2 = xfopen(file2, "r");
|
---|
| 969 |
|
---|
| 970 | /* We can't diff non-seekable stream - we use rewind(), fseek().
|
---|
| 971 | * This can be fixed (volunteers?).
|
---|
| 972 | * Meanwhile we should check it here by stat'ing input fds,
|
---|
| 973 | * but I am lazy and check that in main() instead.
|
---|
| 974 | * Check in main won't catch "diffing fifos buried in subdirectories"
|
---|
| 975 | * failure scenario - not very likely in real life... */
|
---|
| 976 |
|
---|
| 977 | i = files_differ(f1, f2, flags);
|
---|
| 978 | if (i == 0)
|
---|
| 979 | goto closem;
|
---|
| 980 | else if (i != 1) { /* 1 == ok */
|
---|
| 981 | /* error */
|
---|
| 982 | status |= 2;
|
---|
| 983 | goto closem;
|
---|
| 984 | }
|
---|
| 985 |
|
---|
| 986 | if (!asciifile(f1) || !asciifile(f2)) {
|
---|
| 987 | rval = D_BINARY;
|
---|
| 988 | status |= 1;
|
---|
| 989 | goto closem;
|
---|
| 990 | }
|
---|
| 991 |
|
---|
| 992 | prepare(0, f1 /*, stb1.st_size*/);
|
---|
| 993 | prepare(1, f2 /*, stb2.st_size*/);
|
---|
| 994 | prune();
|
---|
| 995 | sort(sfile[0], slen[0]);
|
---|
| 996 | sort(sfile[1], slen[1]);
|
---|
| 997 |
|
---|
| 998 | member = (int *) file[1];
|
---|
| 999 | equiv(sfile[0], slen[0], sfile[1], slen[1], member);
|
---|
| 1000 | member = xrealloc(member, (slen[1] + 2) * sizeof(int));
|
---|
| 1001 |
|
---|
| 1002 | class = (int *) file[0];
|
---|
| 1003 | unsort(sfile[0], slen[0], class);
|
---|
| 1004 | class = xrealloc(class, (slen[0] + 2) * sizeof(int));
|
---|
| 1005 |
|
---|
| 1006 | klist = xmalloc((slen[0] + 2) * sizeof(int));
|
---|
| 1007 | clen = 0;
|
---|
| 1008 | clistlen = 100;
|
---|
| 1009 | clist = xmalloc(clistlen * sizeof(struct cand));
|
---|
| 1010 | i = stone(class, slen[0], member, klist);
|
---|
| 1011 | free(member);
|
---|
| 1012 | free(class);
|
---|
| 1013 |
|
---|
| 1014 | J = xrealloc(J, (len[0] + 2) * sizeof(int));
|
---|
| 1015 | unravel(klist[i]);
|
---|
| 1016 | free(clist);
|
---|
| 1017 | free(klist);
|
---|
| 1018 |
|
---|
| 1019 | ixold = xrealloc(ixold, (len[0] + 2) * sizeof(long));
|
---|
| 1020 | ixnew = xrealloc(ixnew, (len[1] + 2) * sizeof(long));
|
---|
| 1021 | check(f1, f2);
|
---|
| 1022 | output(file1, f1, file2, f2);
|
---|
| 1023 |
|
---|
| 1024 | closem:
|
---|
| 1025 | if (anychange) {
|
---|
| 1026 | status |= 1;
|
---|
| 1027 | if (rval == D_SAME)
|
---|
| 1028 | rval = D_DIFFER;
|
---|
| 1029 | }
|
---|
| 1030 | fclose_if_not_stdin(f1);
|
---|
| 1031 | fclose_if_not_stdin(f2);
|
---|
| 1032 | if (file1 != ofile1)
|
---|
| 1033 | free(file1);
|
---|
| 1034 | if (file2 != ofile2)
|
---|
| 1035 | free(file2);
|
---|
| 1036 | return rval;
|
---|
| 1037 | }
|
---|
| 1038 |
|
---|
| 1039 |
|
---|
| 1040 | #if ENABLE_FEATURE_DIFF_DIR
|
---|
| 1041 | static void do_diff(char *dir1, char *path1, char *dir2, char *path2)
|
---|
| 1042 | {
|
---|
| 1043 | int flags = D_HEADER;
|
---|
| 1044 | int val;
|
---|
| 1045 | char *fullpath1 = NULL; /* if -N */
|
---|
| 1046 | char *fullpath2 = NULL;
|
---|
| 1047 |
|
---|
| 1048 | if (path1)
|
---|
| 1049 | fullpath1 = concat_path_file(dir1, path1);
|
---|
| 1050 | if (path2)
|
---|
| 1051 | fullpath2 = concat_path_file(dir2, path2);
|
---|
| 1052 |
|
---|
| 1053 | if (!fullpath1 || stat(fullpath1, &stb1) != 0) {
|
---|
| 1054 | flags |= D_EMPTY1;
|
---|
| 1055 | memset(&stb1, 0, sizeof(stb1));
|
---|
| 1056 | if (path2) {
|
---|
| 1057 | free(fullpath1);
|
---|
| 1058 | fullpath1 = concat_path_file(dir1, path2);
|
---|
| 1059 | }
|
---|
| 1060 | }
|
---|
| 1061 | if (!fullpath2 || stat(fullpath2, &stb2) != 0) {
|
---|
| 1062 | flags |= D_EMPTY2;
|
---|
| 1063 | memset(&stb2, 0, sizeof(stb2));
|
---|
| 1064 | stb2.st_mode = stb1.st_mode;
|
---|
| 1065 | if (path1) {
|
---|
| 1066 | free(fullpath2);
|
---|
| 1067 | fullpath2 = concat_path_file(dir2, path1);
|
---|
| 1068 | }
|
---|
| 1069 | }
|
---|
| 1070 |
|
---|
| 1071 | if (stb1.st_mode == 0)
|
---|
| 1072 | stb1.st_mode = stb2.st_mode;
|
---|
| 1073 |
|
---|
| 1074 | if (S_ISDIR(stb1.st_mode) && S_ISDIR(stb2.st_mode)) {
|
---|
| 1075 | printf("Common subdirectories: %s and %s\n", fullpath1, fullpath2);
|
---|
| 1076 | goto ret;
|
---|
| 1077 | }
|
---|
| 1078 |
|
---|
| 1079 | if (!S_ISREG(stb1.st_mode) && !S_ISDIR(stb1.st_mode))
|
---|
| 1080 | val = D_SKIPPED1;
|
---|
| 1081 | else if (!S_ISREG(stb2.st_mode) && !S_ISDIR(stb2.st_mode))
|
---|
| 1082 | val = D_SKIPPED2;
|
---|
| 1083 | else
|
---|
| 1084 | val = diffreg(fullpath1, fullpath2, flags);
|
---|
| 1085 |
|
---|
| 1086 | print_status(val, fullpath1, fullpath2, NULL);
|
---|
| 1087 | ret:
|
---|
| 1088 | free(fullpath1);
|
---|
| 1089 | free(fullpath2);
|
---|
| 1090 | }
|
---|
| 1091 | #endif
|
---|
| 1092 |
|
---|
| 1093 |
|
---|
| 1094 | #if ENABLE_FEATURE_DIFF_DIR
|
---|
| 1095 | static int dir_strcmp(const void *p1, const void *p2)
|
---|
| 1096 | {
|
---|
| 1097 | return strcmp(*(char *const *) p1, *(char *const *) p2);
|
---|
| 1098 | }
|
---|
| 1099 |
|
---|
| 1100 |
|
---|
| 1101 | /* This function adds a filename to dl, the directory listing. */
|
---|
| 1102 | static int add_to_dirlist(const char *filename,
|
---|
| 1103 | struct stat ATTRIBUTE_UNUSED * sb, void *userdata,
|
---|
| 1104 | int depth ATTRIBUTE_UNUSED)
|
---|
| 1105 | {
|
---|
| 1106 | /* +2: with space for eventual trailing NULL */
|
---|
| 1107 | dl = xrealloc(dl, (dl_count+2) * sizeof(dl[0]));
|
---|
| 1108 | dl[dl_count] = xstrdup(filename + (int)(ptrdiff_t)userdata);
|
---|
| 1109 | dl_count++;
|
---|
| 1110 | return TRUE;
|
---|
| 1111 | }
|
---|
| 1112 |
|
---|
| 1113 |
|
---|
| 1114 | /* This returns a sorted directory listing. */
|
---|
| 1115 | static char **get_dir(char *path)
|
---|
| 1116 | {
|
---|
| 1117 | dl_count = 0;
|
---|
| 1118 | dl = xzalloc(sizeof(dl[0]));
|
---|
| 1119 |
|
---|
| 1120 | /* If -r has been set, then the recursive_action function will be
|
---|
| 1121 | * used. Unfortunately, this outputs the root directory along with
|
---|
| 1122 | * the recursed paths, so use void *userdata to specify the string
|
---|
| 1123 | * length of the root directory - '(void*)(strlen(path)+)'.
|
---|
| 1124 | * add_to_dirlist then removes root dir prefix. */
|
---|
| 1125 |
|
---|
| 1126 | if (option_mask32 & FLAG_r) {
|
---|
| 1127 | recursive_action(path, ACTION_RECURSE|ACTION_FOLLOWLINKS,
|
---|
| 1128 | add_to_dirlist, NULL,
|
---|
| 1129 | (void*)(strlen(path)+1), 0);
|
---|
| 1130 | } else {
|
---|
| 1131 | DIR *dp;
|
---|
| 1132 | struct dirent *ep;
|
---|
| 1133 |
|
---|
| 1134 | dp = warn_opendir(path);
|
---|
| 1135 | while ((ep = readdir(dp))) {
|
---|
| 1136 | if (!strcmp(ep->d_name, "..") || LONE_CHAR(ep->d_name, '.'))
|
---|
| 1137 | continue;
|
---|
| 1138 | add_to_dirlist(ep->d_name, NULL, (void*)(int)0, 0);
|
---|
| 1139 | }
|
---|
| 1140 | closedir(dp);
|
---|
| 1141 | }
|
---|
| 1142 |
|
---|
| 1143 | /* Sort dl alphabetically. */
|
---|
| 1144 | qsort(dl, dl_count, sizeof(char *), dir_strcmp);
|
---|
| 1145 |
|
---|
| 1146 | dl[dl_count] = NULL;
|
---|
| 1147 | return dl;
|
---|
| 1148 | }
|
---|
| 1149 |
|
---|
| 1150 |
|
---|
| 1151 | static void diffdir(char *p1, char *p2)
|
---|
| 1152 | {
|
---|
| 1153 | char **dirlist1, **dirlist2;
|
---|
| 1154 | char *dp1, *dp2;
|
---|
| 1155 | int pos;
|
---|
| 1156 |
|
---|
| 1157 | /* Check for trailing slashes. */
|
---|
| 1158 | dp1 = last_char_is(p1, '/');
|
---|
| 1159 | if (dp1 != NULL)
|
---|
| 1160 | *dp1 = '\0';
|
---|
| 1161 | dp2 = last_char_is(p2, '/');
|
---|
| 1162 | if (dp2 != NULL)
|
---|
| 1163 | *dp2 = '\0';
|
---|
| 1164 |
|
---|
| 1165 | /* Get directory listings for p1 and p2. */
|
---|
| 1166 |
|
---|
| 1167 | dirlist1 = get_dir(p1);
|
---|
| 1168 | dirlist2 = get_dir(p2);
|
---|
| 1169 |
|
---|
| 1170 | /* If -S was set, find the starting point. */
|
---|
| 1171 | if (start) {
|
---|
| 1172 | while (*dirlist1 != NULL && strcmp(*dirlist1, start) < 0)
|
---|
| 1173 | dirlist1++;
|
---|
| 1174 | while (*dirlist2 != NULL && strcmp(*dirlist2, start) < 0)
|
---|
| 1175 | dirlist2++;
|
---|
| 1176 | if ((*dirlist1 == NULL) || (*dirlist2 == NULL))
|
---|
| 1177 | bb_error_msg(bb_msg_invalid_arg, "NULL", "-S");
|
---|
| 1178 | }
|
---|
| 1179 |
|
---|
| 1180 | /* Now that both dirlist1 and dirlist2 contain sorted directory
|
---|
| 1181 | * listings, we can start to go through dirlist1. If both listings
|
---|
| 1182 | * contain the same file, then do a normal diff. Otherwise, behaviour
|
---|
| 1183 | * is determined by whether the -N flag is set. */
|
---|
| 1184 | while (*dirlist1 != NULL || *dirlist2 != NULL) {
|
---|
| 1185 | dp1 = *dirlist1;
|
---|
| 1186 | dp2 = *dirlist2;
|
---|
| 1187 | pos = dp1 == NULL ? 1 : dp2 == NULL ? -1 : strcmp(dp1, dp2);
|
---|
| 1188 | if (pos == 0) {
|
---|
| 1189 | do_diff(p1, dp1, p2, dp2);
|
---|
| 1190 | dirlist1++;
|
---|
| 1191 | dirlist2++;
|
---|
| 1192 | } else if (pos < 0) {
|
---|
| 1193 | if (option_mask32 & FLAG_N)
|
---|
| 1194 | do_diff(p1, dp1, p2, NULL);
|
---|
| 1195 | else
|
---|
| 1196 | print_only(p1, strlen(p1) + 1, dp1);
|
---|
| 1197 | dirlist1++;
|
---|
| 1198 | } else {
|
---|
| 1199 | if (option_mask32 & FLAG_N)
|
---|
| 1200 | do_diff(p1, NULL, p2, dp2);
|
---|
| 1201 | else
|
---|
| 1202 | print_only(p2, strlen(p2) + 1, dp2);
|
---|
| 1203 | dirlist2++;
|
---|
| 1204 | }
|
---|
| 1205 | }
|
---|
| 1206 | }
|
---|
| 1207 | #endif
|
---|
| 1208 |
|
---|
| 1209 |
|
---|
| 1210 | int diff_main(int argc, char **argv);
|
---|
| 1211 | int diff_main(int argc, char **argv)
|
---|
| 1212 | {
|
---|
| 1213 | bool gotstdin = 0;
|
---|
| 1214 | char *U_opt;
|
---|
| 1215 | char *f1, *f2;
|
---|
| 1216 | llist_t *L_arg = NULL;
|
---|
| 1217 |
|
---|
| 1218 | INIT_G();
|
---|
| 1219 |
|
---|
| 1220 | /* exactly 2 params; collect multiple -L <label> */
|
---|
| 1221 | opt_complementary = "=2:L::";
|
---|
| 1222 | getopt32(argv, "abdiL:NqrsS:tTU:wu"
|
---|
| 1223 | "p" /* ignored (for compatibility) */,
|
---|
| 1224 | &L_arg, &start, &U_opt);
|
---|
| 1225 | /*argc -= optind;*/
|
---|
| 1226 | argv += optind;
|
---|
| 1227 | while (L_arg) {
|
---|
| 1228 | if (label1 && label2)
|
---|
| 1229 | bb_show_usage();
|
---|
| 1230 | if (!label1)
|
---|
| 1231 | label1 = L_arg->data;
|
---|
| 1232 | else { /* then label2 is NULL */
|
---|
| 1233 | label2 = label1;
|
---|
| 1234 | label1 = L_arg->data;
|
---|
| 1235 | }
|
---|
| 1236 | /* we leak L_arg here... */
|
---|
| 1237 | L_arg = L_arg->link;
|
---|
| 1238 | }
|
---|
| 1239 | if (option_mask32 & FLAG_U)
|
---|
| 1240 | context = xatoi_u(U_opt);
|
---|
| 1241 |
|
---|
| 1242 | /*
|
---|
| 1243 | * Do sanity checks, fill in stb1 and stb2 and call the appropriate
|
---|
| 1244 | * driver routine. Both drivers use the contents of stb1 and stb2.
|
---|
| 1245 | */
|
---|
| 1246 |
|
---|
| 1247 | f1 = argv[0];
|
---|
| 1248 | f2 = argv[1];
|
---|
| 1249 | if (LONE_DASH(f1)) {
|
---|
| 1250 | fstat(STDIN_FILENO, &stb1);
|
---|
| 1251 | gotstdin = 1;
|
---|
| 1252 | } else
|
---|
| 1253 | xstat(f1, &stb1);
|
---|
| 1254 | if (LONE_DASH(f2)) {
|
---|
| 1255 | fstat(STDIN_FILENO, &stb2);
|
---|
| 1256 | gotstdin = 1;
|
---|
| 1257 | } else
|
---|
| 1258 | xstat(f2, &stb2);
|
---|
| 1259 | if (gotstdin && (S_ISDIR(stb1.st_mode) || S_ISDIR(stb2.st_mode)))
|
---|
| 1260 | bb_error_msg_and_die("can't compare - to a directory");
|
---|
| 1261 | if (S_ISDIR(stb1.st_mode) && S_ISDIR(stb2.st_mode)) {
|
---|
| 1262 | #if ENABLE_FEATURE_DIFF_DIR
|
---|
| 1263 | diffdir(f1, f2);
|
---|
| 1264 | #else
|
---|
| 1265 | bb_error_msg_and_die("directory comparison not supported");
|
---|
| 1266 | #endif
|
---|
| 1267 | } else {
|
---|
| 1268 | if (S_ISDIR(stb1.st_mode)) {
|
---|
| 1269 | f1 = concat_path_file(f1, f2);
|
---|
| 1270 | xstat(f1, &stb1);
|
---|
| 1271 | }
|
---|
| 1272 | if (S_ISDIR(stb2.st_mode)) {
|
---|
| 1273 | f2 = concat_path_file(f2, f1);
|
---|
| 1274 | xstat(f2, &stb2);
|
---|
| 1275 | }
|
---|
| 1276 | /* XXX: FIXME: */
|
---|
| 1277 | /* We can't diff e.g. stdin supplied by a pipe - we use rewind(), fseek().
|
---|
| 1278 | * This can be fixed (volunteers?) */
|
---|
| 1279 | if (!S_ISREG(stb1.st_mode) || !S_ISREG(stb2.st_mode))
|
---|
| 1280 | bb_error_msg_and_die("can't diff non-seekable stream");
|
---|
| 1281 | print_status(diffreg(f1, f2, 0), f1, f2, NULL);
|
---|
| 1282 | }
|
---|
| 1283 | return status;
|
---|
| 1284 | }
|
---|