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vtools_genesis          1 
vtools_genesis          2 #include "diff.h"
vtools_genesis          3 #include <error.h>
vtools_genesis          4 #include <filenamecat.h>
vtools_genesis          5 #include <setjmp.h>
vtools_genesis          6 #include <xalloc.h>
vtools_genesis          7 #include <dirent.h>
vtools_genesis          8 #include <stdlib.h>
vtools_genesis          9 
vtools_genesis         10 /* Read the directory named by |dir| and store into |dirdata| a sorted
vtools_genesis         11    vector of filenames for its contents.  |dir->desc == -1| means this
vtools_genesis         12    directory is known to be nonexistent, so set |dirdata| to an empty
vtools_genesis         13    vector.  Return -1 (setting |errno|) if error, 0 otherwise.  */
vtools_genesis         14 
vtools_genesis         15 struct dirdata {
vtools_genesis         16     size_t nnames;    /* Number of names.  */
vtools_genesis         17     char const **names;    /* Sorted names of files in dir, followed by 0.  */
vtools_genesis         18     char *data;    /* Allocated storage for file names.  */
vtools_genesis         19 };
vtools_genesis         20 
vtools_genesis         21 static bool dir_loop(struct comparison const *, int);
vtools_genesis         22 
vtools_genesis         23 
vtools_genesis         24 /* Read a directory and get its vector of names.  */
vtools_genesis         25 
vtools_genesis         26 static bool
vtools_genesis         27 dir_read(struct file_data const *dir, struct dirdata *dirdata) {
vtools_genesis         28     register struct dirent *next;
vtools_genesis         29     register size_t i;
vtools_genesis         30 
vtools_genesis         31     /* Address of block containing the files that are described.  */
vtools_genesis         32     char const **names;
vtools_genesis         33 
vtools_genesis         34     /* Number of files in directory.  */
vtools_genesis         35     size_t nnames;
vtools_genesis         36 
vtools_genesis         37     /* Allocated and used storage for file name data.  */
vtools_genesis         38     char *data;
vtools_genesis         39     size_t data_alloc, data_used;
vtools_genesis         40 
vtools_genesis         41     dirdata->names = 0;
vtools_genesis         42     dirdata->data = 0;
vtools_genesis         43     nnames = 0;
vtools_genesis         44     data = 0;
vtools_genesis         45 
vtools_genesis         46     if (dir->desc != -1) {
vtools_genesis         47         /* Open the directory and check for errors.  */
vtools_genesis         48         register DIR *reading = opendir(dir->name);
vtools_genesis         49         if (!reading)
vtools_genesis         50             return false;
vtools_genesis         51 
vtools_genesis         52         /* Initialize the table of filenames.  */
vtools_genesis         53 
vtools_genesis         54         data_alloc = 512;
vtools_genesis         55         data_used = 0;
vtools_genesis         56         dirdata->data = data = xmalloc(data_alloc);
vtools_genesis         57 
vtools_genesis         58         /* Read the directory entries, and insert the subfiles
vtools_genesis         59        into the |data| table.  */
vtools_genesis         60 
vtools_genesis         61         while ((errno = 0, (next = readdir(reading)) != 0)) {
vtools_genesis         62             char *d_name = next->d_name;
vtools_genesis         63             size_t d_size = strlen (next->d_name) + 1;
vtools_genesis         64 
vtools_genesis         65             /* Ignore "." and "..".  */
vtools_genesis         66             if (d_name[0] == '.'
vtools_genesis         67                 && (d_name[1] == 0 || (d_name[1] == '.' && d_name[2] == 0)))
vtools_genesis         68                 continue;
vtools_genesis         69 
vtools_genesis         70             while (data_alloc < data_used + d_size) {
vtools_genesis         71                 if (PTRDIFF_MAX / 2 <= data_alloc)
vtools_genesis         72                     xalloc_die();
vtools_genesis         73                 dirdata->data = data = xrealloc(data, data_alloc *= 2);
vtools_genesis         74             }
vtools_genesis         75 
vtools_genesis         76             memcpy (data + data_used, d_name, d_size);
vtools_genesis         77             data_used += d_size;
vtools_genesis         78             nnames++;
vtools_genesis         79         }
vtools_genesis         80         if (errno) {
vtools_genesis         81             int e = errno;
vtools_genesis         82             closedir(reading);
vtools_genesis         83             errno = e;
vtools_genesis         84             return false;
vtools_genesis         85         }
vtools_genesis         86         if (closedir(reading) != 0)
vtools_genesis         87             return false;
vtools_genesis         88     }
vtools_genesis         89 
vtools_genesis         90     /* Create the |names| table from the |data| table.  */
vtools_genesis         91     if (PTRDIFF_MAX / sizeof *names - 1 <= nnames)
vtools_genesis         92         xalloc_die();
vtools_genesis         93     dirdata->names = names = xmalloc((nnames + 1) * sizeof *names);
vtools_genesis         94     dirdata->nnames = nnames;
vtools_genesis         95     for (i = 0; i < nnames; i++) {
vtools_genesis         96         names[i] = data;
vtools_genesis         97         data += strlen(data) + 1;
vtools_genesis         98     }
vtools_genesis         99     names[nnames] = 0;
vtools_genesis        100     return true;
vtools_genesis        101 }
vtools_genesis        102 
vtools_genesis        103 /* Compare file names, returning a value compatible with strcmp.  */
vtools_genesis        104 
vtools_genesis        105 #define compare_names strcmp
vtools_genesis        106 
vtools_genesis        107 /* Compare names FILE1 and FILE2 when sorting a directory.  */
vtools_genesis        108 
vtools_genesis        109 static int
vtools_genesis        110 compare_names_for_qsort(void const *file1, void const *file2) {
vtools_genesis        111     char const *const *f1 = file1;
vtools_genesis        112     char const *const *f2 = file2;
vtools_genesis        113     char const *name1 = *f1;
vtools_genesis        114     char const *name2 = *f2;
vtools_genesis        115     return compare_names(name1, name2);
vtools_genesis        116 }
vtools_genesis        117 
vtools_genesis        118 /* Compare the contents of two directories named in |cmp|.  This is a
vtools_genesis        119    top-level routine; it does everything necessary for diff on two
vtools_genesis        120    directories.
vtools_genesis        121 
vtools_genesis        122    |cmp->file[0].desc == -1| says directory |cmp->file[0]| doesn't
vtools_genesis        123    exist, but pretend it is empty.  Likewise for |cmp->file[1]|.
vtools_genesis        124 
vtools_genesis        125    |handle_file| is a caller-provided subroutine called to handle each file.
vtools_genesis        126    It gets three operands: |cmp|, name of file in dir 0, name of file in dir 1.
vtools_genesis        127    These names are relative to the original working directory.
vtools_genesis        128 
vtools_genesis        129    For a file that appears in only one of the dirs, one of the name-args
vtools_genesis        130    to |handle_file| is zero.
vtools_genesis        131 
vtools_genesis        132    Returns the maximum of all the values returned by |handle_file|,
vtools_genesis        133    or |exit_trouble| if trouble is encountered in opening files.  */
vtools_genesis        134 
vtools_genesis        135 int
vtools_genesis        136 diff_dirs(struct comparison const *cmp,
vtools_genesis        137           int (*handle_file)(struct comparison const *,
vtools_genesis        138                              char const *, char const *)) {
vtools_genesis        139     struct dirdata dirdata[2];
vtools_genesis        140     int volatile val = EXIT_SUCCESS;
vtools_genesis        141     int i;
vtools_genesis        142 
vtools_genesis        143     if ((cmp->file[0].desc == -1 || dir_loop(cmp, 0))
vtools_genesis        144         && (cmp->file[1].desc == -1 || dir_loop(cmp, 1))) {
vtools_genesis        145         error(0, 0, "%s: recursive directory loop",
vtools_genesis        146               cmp->file[cmp->file[0].desc == -1].name);
vtools_genesis        147         return EXIT_TROUBLE;
vtools_genesis        148     }
vtools_genesis        149 
vtools_genesis        150     /* Get contents of both dirs.  */
vtools_genesis        151     for (i = 0; i < 2; i++)
vtools_genesis        152         if (!dir_read(&cmp->file[i], &dirdata[i])) {
vtools_genesis        153             perror_with_name(cmp->file[i].name);
vtools_genesis        154             val = EXIT_TROUBLE;
vtools_genesis        155         }
vtools_genesis        156 
vtools_genesis        157     if (val == EXIT_SUCCESS) {
vtools_genesis        158         char const **volatile names[2];
vtools_genesis        159         names[0] = dirdata[0].names;
vtools_genesis        160         names[1] = dirdata[1].names;
vtools_genesis        161 
vtools_genesis        162         /* Sort the directories.  */
vtools_genesis        163         for (i = 0; i < 2; i++)
vtools_genesis        164             qsort(names[i], dirdata[i].nnames, sizeof *dirdata[i].names,
vtools_genesis        165                   compare_names_for_qsort);
vtools_genesis        166 
vtools_genesis        167         /* If |-S name| was given, and this is the topmost level of
vtools_genesis        168        comparison, ignore all file names less than the specified
vtools_genesis        169        starting name.  */
vtools_genesis        170 
vtools_genesis        171         if (starting_file && !cmp->parent) {
vtools_genesis        172             while (*names[0] && compare_names(*names[0], starting_file) < 0)
vtools_genesis        173                 names[0]++;
vtools_genesis        174             while (*names[1] && compare_names(*names[1], starting_file) < 0)
vtools_genesis        175                 names[1]++;
vtools_genesis        176         }
vtools_genesis        177 
vtools_genesis        178         /* Loop while files remain in one or both dirs.  */
vtools_genesis        179         while (*names[0] || *names[1]) {
vtools_genesis        180             /* Compare next name in dir 0 with next name in dir 1.  At
vtools_genesis        181                the end of a dir, pretend the "next name" in that dir
vtools_genesis        182                is very large.  */
vtools_genesis        183             int nameorder = (!*names[0] ? 1 : !*names[1] ? -1
vtools_genesis        184                                                          : compare_names(*names[0], *names[1]));
vtools_genesis        185             int v1 = (*handle_file)(cmp,
vtools_genesis        186                                     0 < nameorder ? 0 : *names[0]++,
vtools_genesis        187                                     nameorder < 0 ? 0 : *names[1]++);
vtools_genesis        188             if (val < v1)
vtools_genesis        189                 val = v1;
vtools_genesis        190         }
vtools_genesis        191     }
vtools_genesis        192 
vtools_genesis        193     for (i = 0; i < 2; i++) {
vtools_genesis        194         free(dirdata[i].names);
vtools_genesis        195         free(dirdata[i].data);
vtools_genesis        196     }
vtools_genesis        197 
vtools_genesis        198     return val;
vtools_genesis        199 }
vtools_genesis        200 
vtools_genesis        201 /* Return nonzero if $cmp$ is looping recursively in argument $i$.  */
vtools_genesis        202 
vtools_genesis        203 static bool
vtools_genesis        204 dir_loop(struct comparison const *cmp, int i) {
vtools_genesis        205     struct comparison const *p = cmp;
vtools_genesis        206     while ((p = p->parent))
vtools_genesis        207         if (0 < same_file (&p->file[i].stat, &cmp->file[i].stat))
vtools_genesis        208             return true;
vtools_genesis        209     return false;
vtools_genesis        210 }
vtools_genesis        211 
vtools_genesis        212 /* Find a matching filename in a directory.  */
vtools_genesis        213 
vtools_genesis        214 char *
vtools_genesis        215 find_dir_file_pathname(char const *dir, char const *file) {
vtools_genesis        216     const char *match = file;
vtools_genesis        217     return file_name_concat(dir, match, NULL);
vtools_genesis        218 }