Superficial changes to make the exclude/include code easier to understand

[android-x86/external-busybox.git] / tar.c

diff --git a/tar.c b/tar.c
index ea0247e..bb66d40 100644 (file)
--- a/tar.c
+++ b/tar.c
@@ -513,25 +513,30 @@ void append_file_to_list(char *filename, char ***name_list, int *num_of_entries)
                if (line_ptr) {
                        *line_ptr = '\0';
                }
-               *name_list = realloc(*name_list, sizeof(char *) * (*num_of_entries + 1));
+               *name_list = realloc(*name_list, sizeof(char *) * (*num_of_entries + 2));
                (*name_list)[*num_of_entries] = xstrdup(line);
                (*num_of_entries)++;
                free(line);
        }
        fclose(src_stream);
+       (*name_list)[*num_of_entries] = NULL;
 }
 
 #ifdef BB_FEATURE_TAR_EXCLUDE
-char **merge_list(char **include_list, char **exclude_list)
+/*
+ * Create a list of names that are in the include list AND NOT in the exclude lists
+ */
+char **list_and_not_list(char **include_list, char **exclude_list)
 {
        char **new_include_list = NULL;
        int new_include_count = 0;
        int include_count = 0;
        int exclude_count;
 
-       if (include_list == NULL)
-               return exclude_list;
-
+       if (include_list == NULL) {
+               return(NULL);
+       }
+       
        while (include_list[include_count] != NULL) {
                int found = FALSE;
                exclude_count = 0;
@@ -547,12 +552,12 @@ char **merge_list(char **include_list, char **exclude_list)
                        new_include_list = realloc(new_include_list, sizeof(char *) * (include_count + 2));
                        new_include_list[new_include_count] = include_list[include_count];
                        new_include_count++;
-                       new_include_list[new_include_count] = NULL;
                } else {
                        free(include_list[include_count]);
                }
                include_count++;
        }
+       new_include_list[new_include_count] = NULL;
        return(new_include_list);
 }
 #endif
@@ -572,12 +577,13 @@ int tar_main(int argc, char **argv)
 
 #ifdef BB_FEATURE_TAR_EXCLUDE
        char **exclude_list = NULL;
-       int exclude_count = 0;
+       int exclude_list_count = 0;
 #endif
 
        FILE *src_stream = NULL;
        FILE *uncompressed_stream = NULL;
        char **include_list = NULL;
+       char **the_real_list = NULL;
        char *src_filename = NULL;
        char *dst_prefix = NULL;
        char *file_list_name = NULL;
@@ -585,7 +591,7 @@ int tar_main(int argc, char **argv)
        unsigned short untar_funct = 0;
        unsigned short untar_funct_required = 0;
        unsigned short extract_function = 0;
-       int include_count = 0;
+       int include_list_count = 0;
        int gunzip_pid;
        int gz_fd = 0;
 
@@ -621,13 +627,13 @@ int tar_main(int argc, char **argv)
                /* Exclude or Include files listed in <filename>*/
 #ifdef BB_FEATURE_TAR_EXCLUDE
                case 'X':
-                       append_file_to_list(optarg, &exclude_list, &exclude_count);
-                       exclude_list[exclude_count] = NULL;     
+                       append_file_to_list(optarg, &exclude_list, &exclude_list_count);
+                       exclude_list[exclude_list_count] = NULL;        
                        break;
 #endif
                case 'T':
                        // by default a list is an include list
-                       append_file_to_list(optarg, &include_list, &include_count);
+                       append_file_to_list(optarg, &include_list, &include_list_count);
                        break;
 
                case 'C':       // Change to dir <optarg>
@@ -677,23 +683,29 @@ int tar_main(int argc, char **argv)
 
        /* Setup an array of filenames to work with */
        while (optind < argc) {
-               include_list = realloc(include_list, sizeof(char *) * (include_count + 2));
-               include_list[include_count] = xstrdup(argv[optind]);
-               include_count++;
+               include_list = realloc(include_list, sizeof(char *) * (include_list_count + 2));
+               include_list[include_list_count] = xstrdup(argv[optind]);
+               include_list_count++;
                optind++;
-               include_list[include_count] = NULL;
+               include_list[include_list_count] = NULL;
        }
 
+       /* By default the include list is the list we act on */
+       the_real_list = include_list;
+
 #ifdef BB_FEATURE_TAR_EXCLUDE
-       /* Remove excluded files from the include list */
        if (exclude_list != NULL) {
-               /* If both an exclude and include file list were present then
-                * it's an exclude from include list only, if not it's really an
-                * exclude list (and a poor choice of variable names) */
                if (include_list == NULL) {
+                       /* the_real_list is an exclude list */
                        extract_function |= extract_exclude_list;
+                       the_real_list = exclude_list;
+               } else {
+                       /* Both an exclude and include file list was present,
+                        * its an exclude from include list only.
+                        * Remove excluded files from the include list
+                        */
+                       the_real_list = list_and_not_list(include_list, exclude_list);
                }
-               include_list = merge_list(include_list, exclude_list);
        }
 #endif
 
@@ -717,7 +729,7 @@ int tar_main(int argc, char **argv)
                        uncompressed_stream = src_stream;
                
                /* extract or list archive */
-               unarchive(uncompressed_stream, stdout, &get_header_tar, extract_function, dst_prefix, include_list);
+               unarchive(uncompressed_stream, stdout, &get_header_tar, extract_function, dst_prefix, the_real_list);
                fclose(uncompressed_stream);
        }
 #ifdef BB_FEATURE_TAR_CREATE
@@ -733,7 +745,7 @@ int tar_main(int argc, char **argv)
                if (extract_function & extract_verbose_list) {
                        verboseFlag = TRUE;
                }
-               writeTarFile(src_filename, verboseFlag, &argv[argc - 1], include_list);
+               writeTarFile(src_filename, verboseFlag, &argv[argc - 1], the_real_list);
        }
 #endif // BB_FEATURE_TAR_CREATE