Changes in / [917a8c8:beb6b3d] in mainline

Location:

uspace/app/bdsh/cmds/modules/ls

Files:

• ls.c (modified) (8 diffs)
• ls.h (modified) (1 diff)

uspace/app/bdsh/cmds/modules/ls/ls.c

@@ -38 +38 @@
 #include <dirent.h>
 #include <fcntl.h>
+#include <getopt.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <str.h>
+#include <sort.h>
 
 #include "errors.h"
@@ -51 +53 @@
 static const char *cmdname = "ls";
 
-static void ls_scan_dir(const char *d, DIR *dirp)
-{
-        struct dirent *dp;
-        char *buff;
-
+static struct option const long_options[] = {
+        { "help", no_argument, 0, 'h' },
+        { "unsort", no_argument, 0, 'u' },      
+        { 0, 0, 0, 0 }
+};
+
+/** Compare 2 directory elements.
+ *
+ * It compares 2 elements of a directory : a file is considered
+ * as lower than a directory, and if they have the same type,
+ * they are compared alphabetically.
+ *
+ * @param a             Pointer to the structure of the first element.
+ * @param b             Pointer to the structure of the second element.
+ * @param arg   Pointer for an other and optionnal argument.
+ *
+ * @return              -1 if a < b,
+ *                              1 otherwise.
+ */
+static int ls_cmp(void *a, void *b, void *arg)
+{
+        int a_isdir = (*((struct dir_elem_t *)a)).isdir;
+        char * a_name = (*((struct dir_elem_t *)a)).name;
+        
+        int b_isdir = (*((struct dir_elem_t *)b)).isdir;
+        char * b_name = (*((struct dir_elem_t *)b)).name;
+        
+        if ((!a_isdir && b_isdir)
+                || (((!b_isdir && !a_isdir) || (b_isdir && a_isdir))
+                && str_cmp(a_name, b_name) < 0))
+                return -1;
+        else
+                return 1;
+}
+
+/** Scan a directory.
+ *
+ * Scan the content of a directory and print it.
+ *
+ * @param d             Name of the directory.
+ * @param dirp  Directory stream.
+ */
+static void ls_scan_dir(const char *d, DIR *dirp, int sort)
+{
+        int alloc_blocks = 20;
+        int i = 0;
+        int nbdirs = 0;
+        int rc = 0;
+        char * buff = NULL;
+        struct dir_elem_t * tmp = NULL;
+        struct dir_elem_t * tosort = NULL;
+        struct dirent * dp = NULL;
+        struct stat s;
+        
         if (! dirp)
                 return;
@@ -64 +115 @@
                 return;
         }
-
+        memset(buff, 0, sizeof(buff));
+        
+        if (!sort) {
+                while ((dp = readdir(dirp))) {
+                        memset(buff, 0, sizeof(buff));
+                        /* Don't worry if inserting a double slash, this will be fixed by
+                         * absolutize() later with subsequent calls to open() or readdir() */
+                        snprintf(buff, PATH_MAX - 1, "%s/%s", d, dp->d_name);
+                        ls_print(dp->d_name, buff);
+                }
+
+                free(buff);
+
+                return;
+        }
+        
+        tosort = (struct dir_elem_t *)malloc(alloc_blocks*sizeof(struct dir_elem_t));
+        if (NULL == tosort) {
+                cli_error(CL_ENOMEM, "ls: failed to scan %s", d);
+                free(buff);
+                return;
+        }
+        memset(tosort, 0, sizeof(tosort));
+        
         while ((dp = readdir(dirp))) {
+                nbdirs++;
+                
+                if (nbdirs > alloc_blocks) {
+                        alloc_blocks += alloc_blocks;
+                        
+                        tmp = (struct dir_elem_t *)realloc(tosort,
+                                        alloc_blocks*sizeof(struct dir_elem_t));
+                        if (NULL == tmp) {
+                                cli_error(CL_ENOMEM, "ls: failed to scan %s", d);
+                                for(i=0;i<(nbdirs-1);i++) {
+                                        free(tosort[i].name);
+                                }
+                                free(tosort);
+                                free(buff);
+                                return;
+                        }
+                        
+                        tosort = tmp;
+                }
+                
+                // fill the name field
+                tosort[nbdirs-1].name = (char *)malloc(str_length(dp->d_name)+1);
+                if (NULL == tosort[nbdirs-1].name) {
+                        cli_error(CL_ENOMEM, "ls: failed to scan %s", d);
+                        for(i=0;i<(nbdirs-1);i++) {
+                                free(tosort[i].name);
+                        }
+                        free(tosort);
+                        free(buff);
+                        return;
+                }
+                
+                memset(tosort[nbdirs-1].name, 0, str_length(dp->d_name)+1);
+                str_cpy(tosort[nbdirs-1].name, str_length(dp->d_name)+1, dp->d_name);
+                
+                // fill the isdir field
+                memset(buff, 0, sizeof(buff));
+                snprintf(buff, PATH_MAX - 1, "%s/%s", d, tosort[nbdirs-1].name);
+                
+                rc = stat(buff, &s);
+                if (rc != 0) {
+                        printf("ls: skipping bogus node %s\n", buff);
+                        printf("rc=%d\n", rc);
+                        for(i=0;i<nbdirs;i++) {
+                                free(tosort[i].name);
+                        }
+                        free(tosort);
+                        free(buff);
+                        return;
+                }
+                
+                tosort[nbdirs-1].isdir = s.is_directory ? 1 : 0;
+        }
+        
+        if (!qsort(&tosort[0], nbdirs, sizeof(struct dir_elem_t), ls_cmp, NULL)) {
+                printf("Sorting error.\n");
+        }
+        
+        for(i=0;i<nbdirs;i++) {
                 memset(buff, 0, sizeof(buff));
                 /* Don't worry if inserting a double slash, this will be fixed by
                  * absolutize() later with subsequent calls to open() or readdir() */
-                snprintf(buff, PATH_MAX - 1, "%s/%s", d, dp->d_name);
-                ls_print(dp->d_name, buff);
-        }
-
+                snprintf(buff, PATH_MAX - 1, "%s/%s", d, tosort[i].name);
+                ls_print(tosort[i].name, buff);
+                free(tosort[i].name);
+        }
+        
+        free(tosort);
         free(buff);
 
@@ -78 +213 @@
 }
 
-/* ls_print currently does nothing more than print the entry.
- * in the future, we will likely pass the absolute path, and
+/** Print an entry.
+ *
+ * ls_print currently does nothing more than print the entry.
+ * In the future, we will likely pass the absolute path, and
  * some sort of ls_options structure that controls how each
  * entry is printed and what is printed about it.
  *
- * Now we just print basic DOS style lists */
-
+ * Now we just print basic DOS style lists.
+ *
+ * @param name          Name of the entry.
+ * @param pathname      Path of the entry.
+ */
 static void ls_print(const char *name, const char *pathname)
 {
@@ -114 +254 @@
         } else {
                 help_cmd_ls(HELP_SHORT);
-                printf("  `%s' [path], if no path is given the current "
-                                "working directory is used.\n", cmdname);
+                printf(
+                "Usage:  %s [options] [path]\n"
+                "If not path is given, the current working directory is used.\n"
+                "Options:\n"
+                "  -h, --help       A short option summary\n"
+                "  -u, --unsort     Do not sort directory entries\n",
+                cmdname);
         }
 
@@ -127 +272 @@
         char *buff;
         DIR *dirp;
+        int c, opt_ind;
+        int sort = 1;
 
         argc = cli_count_args(argv);
-
+        
+        for (c = 0, optind = 0, opt_ind = 0; c != -1;) {
+                c = getopt_long(argc, argv, "hu", long_options, &opt_ind);
+                switch (c) {
+                case 'h':
+                        help_cmd_ls(HELP_LONG);
+                        return CMD_SUCCESS;
+                case 'u':
+                        sort = 0;
+                        break;
+                }
+        }
+        
+        int dir = (int)argc > optind ? (int)argc-1 : optind-1;
+        argc -= (optind-1);
+        
         buff = (char *) malloc(PATH_MAX);
         if (NULL == buff) {
@@ -136 +298 @@
         }
         memset(buff, 0, sizeof(buff));
-
+        
         if (argc == 1)
                 getcwd(buff, PATH_MAX);
         else
-                str_cpy(buff, PATH_MAX, argv[1]);
-
+                str_cpy(buff, PATH_MAX, argv[dir]);
+        
         if (stat(buff, &s)) {
                 cli_error(CL_ENOENT, buff);
@@ -158 +320 @@
                         return CMD_FAILURE;
                 }
-                ls_scan_dir(buff, dirp);
+                ls_scan_dir(buff, dirp, sort);
                 closedir(dirp);
         }

uspace/app/bdsh/cmds/modules/ls/ls.h

@@ -7 +7 @@
 #define LS_DIR   2
 
-static void ls_scan_dir(const char *, DIR *);
+static void ls_scan_dir(const char *, DIR *, int);
 static void ls_print(const char *, const char *);
+
+/** Structure to represent a directory entry.
+ *
+ * Useful to keep together important informations
+ * for sorting directory entries.
+ */
+struct dir_elem_t {
+        char * name;
+        int isdir;
+};
 
 #endif /* LS_H */