Usermode/Applications/ls_src/main.c

   1 /*
   2  * Acess2 LS command
   3  */
   4 #include <acess/sys.h>
   5 #include <stdlib.h>
   6 #include <stdio.h>
   7 #include <string.h>
   8
   9 #define BUF_SIZE        1024
  10
  11 // === PROTOTYPES ===
  12  int    main(int argc, char *argv[]);
  13 void    ShowUsage(char *ProgName);
  14 void    ParseArguments(int argc, char *argv[]);
  15 void    SortFileList();
  16
  17 // === GLOBALS ===
  18 // --- Flags ---
  19  int    gbShowAll = 0;
  20  int    gbShowImplicit = 0;
  21  int    gbViewExtended = 0;
  22  int    gbViewHumanReadable = 0;
  23 // --- Parameters ---
  24 char    *gsDirectory = NULL;
  25 // --- Working Set ---
  26 char    **gFileList;
  27  int    giNumFiles = 0;
  28
  29 /**
  30  * \fn int main(int argc, char *argv[])
  31  * \brief Entrypoint
  32  */
  33 int main(int argc, char *argv[])
  34 {
  35          int    fd, tmp;
  36         char    buf[BUF_SIZE+1];
  37         t_sysFInfo      info;
  38          int    space = 0;
  39
  40         // Arguments Check
  41         ParseArguments(argc, argv);
  42
  43         // Open Directory
  44         fd = open(gsDirectory, OPENFLAG_READ|OPENFLAG_EXEC);
  45         if(fd == -1) {
  46                 printf("Unable to open '%s' for reading\n", gsDirectory);
  47                 return EXIT_FAILURE;
  48         }
  49
  50         // Check that it is a directory
  51         finfo(fd, &info, 0);
  52         if( !(info.flags & FILEFLAG_DIRECTORY) ) {
  53                 fprintf(stderr, "'%s' is a directory\n", gsDirectory);
  54                 close(fd);
  55                 return EXIT_FAILURE;
  56         }
  57
  58         // Traverse Directory
  59         while( (tmp = readdir(fd, buf)) )
  60         {
  61                 // Error check
  62                 if(tmp < 0) {
  63                         close(fd);
  64                         return EXIT_FAILURE;
  65                 }
  66
  67                 // Allocate Space
  68                 if(space == giNumFiles)
  69                 {
  70                         space += 16;
  71                         gFileList = realloc(gFileList, space*sizeof(char*));
  72                         if(gFileList == NULL) {
  73                                 close(fd);
  74                                 return EXIT_FAILURE;
  75                         }
  76                 }
  77                 gFileList[giNumFiles++] = strdup(buf);
  78         }
  79
  80         // Sort File List according to rules passed
  81         SortFileList();
  82
  83         close(fd);
  84         printf("\n");
  85
  86         return EXIT_SUCCESS;
  87 }
  88
  89 /**
  90  * \fn void ShowUsage(char *ProgName)
  91  */
  92 void ShowUsage(char *ProgName)
  93 {
  94         fprintf(stderr, "Usage: %s [options] [<directory>]\n", ProgName);
  95         fprintf(stderr, "\n");
  96 }
  97
  98 /**
  99  * \fn void ParseArguments(int argc, char *argv[])
 100  * \brief Parse the command line arguments
 101  */
 102 void ParseArguments(int argc, char *argv[])
 103 {
 104          int    i;
 105         char    *str;
 106         for( i = 1; i < argc; i ++ )
 107         {
 108                 str = argv[i];
 109                 // Flags
 110                 if(str[0] == '-')
 111                 {
 112                         if(str[1] == '-')
 113                         {
 114                                 continue;
 115                         }
 116                         str = &str[1];
 117                         for( ; *str; str++ )
 118                         {
 119                                 switch(*str)
 120                                 {
 121                                 // Show All
 122                                 case 'a':       gbShowAll = 1;  gbShowImplicit = 1;     continue;
 123                                 // Almost All
 124                                 case 'A':       gbShowAll = 1;  gbShowImplicit = 0;     continue;
 125                                 // Extended List
 126                                 case 'l':       gbViewExtended = 1;     continue;
 127                                 // Human readable sizes
 128                                 case 'h':       gbViewHumanReadable = 1;        continue;
 129                                 default:
 130                                         fprintf(stderr, "%s: Unknown option '%c'\n", *str);
 131                                         ShowUsage(argv[0]);
 132                                         exit(EXIT_FAILURE);
 133                                 }
 134                         }
 135                         continue;
 136                 }
 137
 138                 if(gsDirectory == NULL) {
 139                         gsDirectory = argv[i];
 140                 }
 141         }
 142
 143         // Apply Defaults
 144         if(!gsDirectory)        gsDirectory = ".";
 145
 146         printf("gsDirectory = '%s'\n", gsDirectory);
 147 }
 148
 149 /**
 150  * \fn int strcmpp(void *p1, void *p2)
 151  * \brief Compares two strings given pointers to their pointers
 152  */
 153 int strcmpp(const void *p1, const void *p2)
 154 {
 155         return strcmp( *(char **)p1, *(char **)p2 );
 156 }
 157
 158 /**
 159  * \fn void SortFileList()
 160  * \brief Sorts the filled file list
 161  */
 162 void SortFileList()
 163 {
 164         qsort(gFileList, giNumFiles, sizeof(char*), strcmpp);
 165 }