xattr/xattr_view.c

+/* view_xattr.c
+
+   Display the extended attributes of a file.
+
+   This program is Linux (2.6 and later) specific.
+
+   See also t_setxattr.c.
+*/
 #include <sys/xattr.h>
 #include "tlpi_hdr.h"
 
 #define XATTR_SIZE 10000
 
 static void
 usageError(char *progName)
 {
     fprintf(stderr, "Usage: %s [-x] file...\n", progName);
     exit(EXIT_FAILURE);
 }
 
 int
 main(int argc, char *argv[])
 {
     char list[XATTR_SIZE], value[XATTR_SIZE];
     ssize_t listLen, valueLen;
     int ns, j, k, opt;
     Boolean hexDisplay;
 
     hexDisplay = 0;
     while ((opt = getopt(argc, argv, "x")) != -1) {
         switch (opt) {
         case 'x': hexDisplay = 1;       break;
         case '?': usageError(argv[0]);
         }
     }
 
     if (optind >= argc)
         usageError(argv[0]);
 
     for (j = optind; j < argc; j++) {
         listLen = listxattr(argv[j], list, XATTR_SIZE);
         if (listLen == -1)
             errExit("listxattr");
 
         printf("%s:\n", argv[j]);
 
         /* Loop through all EA names, displaying name + value */
 
         for (ns = 0; ns < listLen; ns += strlen(&list[ns]) + 1) {
             printf("        name=%s; ", &list[ns]);
 
             valueLen = getxattr(argv[j], &list[ns], value, XATTR_SIZE);
             if (valueLen == -1) {
                 printf("couldn't get value");
             } else if (!hexDisplay) {
                 printf("value=%.*s", (int) valueLen, value);
             } else {
                 printf("value=");
                 for (k = 0; k < valueLen; k++)
                     printf("%02x ", (unsigned char) value[k]);
             }
 
             printf("\n");
         }
 
         printf("\n");
     }
 
     exit(EXIT_SUCCESS);
 }