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Diffstat (limited to 'reference/C/CONTRIB/OR_USING_C/04.3.c')
| -rw-r--r-- | reference/C/CONTRIB/OR_USING_C/04.3.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/reference/C/CONTRIB/OR_USING_C/04.3.c b/reference/C/CONTRIB/OR_USING_C/04.3.c new file mode 100644 index 0000000..9c55974 --- /dev/null +++ b/reference/C/CONTRIB/OR_USING_C/04.3.c @@ -0,0 +1,183 @@ +#include <sys/types.h> +#include <sys/stat.h> +#include <sys/dir.h> +#include <stdio.h> + +char *modes[] = { + "---", "--x", "-w-", "-wx", + "r--", "r-x", "rw-", "rwx" +}; + +main(argc, argv) +int argc; +char **argv; +{ + struct stat sbuf; + + /* + * If no arguments, list current directory. + */ + if (argc < 2) { + list("."); + exit(0); + } + + /* + * Process arguments. + */ + while (--argc) { + /* + * See what the file is. + */ + if (stat(*++argv, &sbuf) < 0) { + perror(*argv); + continue; + } + + /* + * If it's a directory we list it, + * otherwise just print the info about + * the file. + */ + if ((sbuf.st_mode & S_IFMT) == S_IFDIR) + list(*argv); + else + printout(".", *argv); + } + + exit(0); +} + +/* + * list--read a directory and list the files it + * contains. + */ +list(name) +char *name; +{ + DIR *dp; + struct direct *dir; + + /* + * Open the directory. + */ + if ((dp = opendir(name)) == NULL) { + fprintf(stderr, "%s: cannot open.\n", name); + return; + } + + /* + * For each entry... + */ + while ((dir = readdir(dp)) != NULL) { + /* + * Skip removed files. + */ + if (dir->d_ino == 0) + continue; + + /* + * Print it out. + */ + printout(name, dir->d_name); + } + + closedir(dp); +} + +/* + * printout--print out the information about + * a file. + */ +printout(dir, name) +char *dir, *name; +{ + int i, j; + char perms[10]; + struct stat sbuf; + char newname[1024]; + + /* + * Make full path name, so + * we have a legal path. + */ + sprintf(newname, "%s/%s", dir, name); + + /* + * At this point we know the file exists, + * so this won't fail. + */ + stat(newname, &sbuf); + + /* + * Print size in kbytes. + */ + printf("%5d ", (sbuf.st_size + 1023) / 1024); + + /* + * Get the file type. For convenience (and to + * make this example universal), we ignore the + * other types which are version-dependent. + */ + switch (sbuf.st_mode & S_IFMT) { + case S_IFREG: putchar('-'); break; + case S_IFDIR: putchar('d'); break; + case S_IFCHR: putchar('c'); break; + case S_IFBLK: putchar('b'); break; + default: putchar('?'); break; + } + + /* + * Get each of the three groups of permissions + * (owner, group, world). Since they're just + * bits, we can count in binary and use this + * as a subscript (see the modes array, above). + */ + *perms = NULL; + for (i = 2; i >= 0; i--) { + /* + * Since we're subscripting, we don't + * need the constants. Just get a + * value between 0 and 7. + */ + j = (sbuf.st_mode >> (i*3)) & 07; + + /* + * Get the perm bits. + */ + strcat(perms, modes[j]); + } + + /* + * Handle special bits which replace the 'x' + * in places. + */ + if ((sbuf.st_mode & S_ISUID) != 0) + perms[2] = 's'; + if ((sbuf.st_mode & S_ISGID) != 0) + perms[5] = 's'; + if ((sbuf.st_mode & S_ISVTX) != 0) + perms[8] = 't'; + + /* + * Print permissions, number of links, + * user and group ids. + */ + printf("%s%3d %5d/%-5d ", perms, sbuf.st_nlink, sbuf.st_uid, + sbuf.st_gid); + + /* + * Print the size of the file in bytes, + * and the last modification time. The + * ctime routine converts a time to ASCII; + * it is described in Chapter 7, Telling + * Time and Timing Things. + */ + printf("%7d %.12s ", sbuf.st_size, ctime(&sbuf.st_mtime)+4); + + /* + * Finally, print the filename. + */ + printf("%s\n", name); +} + |