diff options
Diffstat (limited to 'examples/validchars/validchr.c')
| -rw-r--r-- | examples/validchars/validchr.c | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/examples/validchars/validchr.c b/examples/validchars/validchr.c new file mode 100644 index 0000000000..415546cb84 --- /dev/null +++ b/examples/validchars/validchr.c @@ -0,0 +1,123 @@ +/* by tino@augsburg.net
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#include <dirent.h>
+
+unsigned char
+test(void)
+{
+ DIR *dir;
+ struct dirent *dp;
+ unsigned char c;
+
+ if ((dir=opendir("."))==0)
+ {
+ perror("open .");
+ return 0;
+ }
+ c = 0;
+ while ((dp=readdir(dir))!=0)
+ {
+ size_t len;
+
+ len = strlen(dp->d_name);
+ if (len<4)
+ continue;
+ if (strcmp(dp->d_name+len-4, ".TST"))
+ continue;
+ if (len!=5)
+ {
+ fprintf(stderr, "warning: %s\n", dp->d_name);
+ printf(" length");
+ continue;
+ }
+ if (c)
+ printf(" double%d\n", c);
+ c = dp->d_name[0];
+ }
+ if (closedir(dir))
+ perror("close .");
+ return c;
+}
+
+int
+main(void)
+{
+ char name[256];
+ unsigned char map[256], upper[256], lower[256];
+ int i, j, c;
+ FILE *fd;
+
+ if (test())
+ {
+ printf("There are *.TST files, please remove\n");
+ return 0;
+ }
+ for (i=0; ++i<256; )
+ {
+ lower[i] = i;
+ upper[i] = 0;
+ }
+ for (i=256; --i; )
+ {
+ map[i] = i;
+ strcpy(name, "..TST");
+ name[0] = i;
+ printf("%d:", i);
+ if ((fd=fopen(name, "w"))==0)
+ printf(" open");
+ else
+ fclose(fd);
+ c = test();
+ if (unlink(name))
+ printf(" unlink");
+ if (c==i)
+ printf(" ok");
+ else
+ printf(" %d", c);
+ printf("\n");
+ if (c!=i)
+ {
+ upper[c]++;
+ lower[c] = i;
+ }
+ map[i] = c;
+ }
+
+ /* Uppercase characters are detected above on:
+ * The character is mapped to itself and there is a
+ * character which maps to it.
+ * Lowercase characters are the lowest character pointing to another one.
+ * Else it is a one way character.
+ *
+ * For this reason we have to process the list
+ * 1) for 'one way' characters
+ * 'one way' is something which is no upper and no lower character.
+ * This is an awful, crude and ugly hack due to missing Samba support.
+ * 2) for true uppercase/lowercase characters
+ * 3) for standalone characters
+ * Note that there might be characters which do not fall into 1 to 3.
+ */
+ printf("\n valid chars =");
+ for (i=0; ++i<256; )
+ if (map[i] && map[i]!=i && lower[map[i]]!=i)
+ {
+ if (!upper[i])
+ printf(" %d:%d %d:%d %d:%d", /*1*/
+ map[i], i, i, map[i], map[i], map[i]);
+ else
+ fprintf(stderr, "ignoring map %d->%d because of %d->%d\n",
+ lower[i], i, i, map[i]);
+ }
+ for (i=0; ++i<256; )
+ if (map[i] && map[i]==i)
+ if (upper[i])
+ printf(" %d:%d", lower[i], i); /*2*/
+ else
+ printf(" %d", i); /*3*/
+ printf("\n");
+ return 0;
+}
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