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[eos/base.git] / util / src / TclTk / tcl8.6.12 / compat / opendir.c

diff --git a/util/src/TclTk/tcl8.6.12/compat/opendir.c b/util/src/TclTk/tcl8.6.12/compat/opendir.c
new file mode 100644 (file)
index 0000000..07ef572
--- /dev/null
+++ b/util/src/TclTk/tcl8.6.12/compat/opendir.c
@@ -0,0 +1,110 @@
+/*
+ * opendir.c --
+ *
+ *     This file provides dirent-style directory-reading procedures for V7
+ *     Unix systems that don't have such procedures. The origin of this code
+ *     is unclear, but it seems to have come originally from Larry Wall.
+ */
+
+#include "tclInt.h"
+
+#undef DIRSIZ
+#define DIRSIZ(dp) \
+    ((sizeof(struct dirent) - (MAXNAMLEN+1)) + (((dp)->d_namlen+1 + 3) &~ 3))
+
+/*
+ * open a directory.
+ */
+
+DIR *
+opendir(
+    char *name)
+{
+    DIR *dirp;
+    int fd;
+    const char *myname;
+
+    myname = ((*name == '\0') ? "." : name);
+    if ((fd = open(myname, 0, 0)) == -1) {
+       return NULL;
+    }
+    dirp = (DIR *) ckalloc(sizeof(DIR));
+    if (dirp == NULL) {
+       /* unreachable? */
+       close(fd);
+       return NULL;
+    }
+    dirp->dd_fd = fd;
+    dirp->dd_loc = 0;
+    return dirp;
+}
+
+/*
+ * read an old style directory entry and present it as a new one
+ */
+#ifndef pyr
+#define        ODIRSIZ 14
+
+struct olddirect {
+    ino_t od_ino;
+    char od_name[ODIRSIZ];
+};
+#else  /* a Pyramid in the ATT universe */
+#define        ODIRSIZ 248
+
+struct olddirect {
+    long od_ino;
+    short od_fill1, od_fill2;
+    char od_name[ODIRSIZ];
+};
+#endif
+
+/*
+ * get next entry in a directory.
+ */
+
+struct dirent *
+readdir(
+    DIR *dirp)
+{
+    struct olddirect *dp;
+    static struct dirent dir;
+
+    for (;;) {
+       if (dirp->dd_loc == 0) {
+           dirp->dd_size = read(dirp->dd_fd, dirp->dd_buf, DIRBLKSIZ);
+           if (dirp->dd_size <= 0) {
+               return NULL;
+           }
+       }
+       if (dirp->dd_loc >= dirp->dd_size) {
+           dirp->dd_loc = 0;
+           continue;
+       }
+       dp = (struct olddirect *)(dirp->dd_buf + dirp->dd_loc);
+       dirp->dd_loc += sizeof(struct olddirect);
+       if (dp->od_ino == 0) {
+           continue;
+       }
+       dir.d_ino = dp->od_ino;
+       strncpy(dir.d_name, dp->od_name, ODIRSIZ);
+       dir.d_name[ODIRSIZ] = '\0'; /* insure null termination */
+       dir.d_namlen = strlen(dir.d_name);
+       dir.d_reclen = DIRSIZ(&dir);
+       return &dir;
+    }
+}
+
+/*
+ * close a directory.
+ */
+
+void
+closedir(
+    DIR *dirp)
+{
+    close(dirp->dd_fd);
+    dirp->dd_fd = -1;
+    dirp->dd_loc = 0;
+    ckfree((char *)dirp);
+}