added simple fingerprinting

CVS patchset: 2612
CVS date: 1998/12/26 17:12:50

lib/Makefile.am

@@ -20,7 +20,7 @@ librpm_a_SOURCES = \
 	messages.c misc.c oldheader.c package.c query.c \
 	rebuilddb.c rpmdb.c rpmerr.c rpmio.c rpmlead.c \
 	rpmrc.c signature.c stringbuf.c tagtable.c \
-	tread.c uninstall.c verify.c transaction.c problems.c hash.c
+	tread.c uninstall.c verify.c transaction.c problems.c hash.c fprint.c
 
 include ../Makefile.inc
 

lib/fprint.c

@@ -0,0 +1,68 @@
+#include "system.h"
+
+#include "rpmlib.h"
+
+#include "fprint.h"
+
+fingerPrint fpLookup(char * fullName, int scareMemory) {
+    char dir[PATH_MAX];
+    char * chptr1, * end;
+    fingerPrint fp;
+    struct stat sb;
+    char * buf;
+
+    /* assert(*fullName == '/' || !scareMemory); */
+
+    /* FIXME: a directory stat cache could *really* speed things up. we'd
+       have to be sure to flush it, but... */
+
+    if (*fullName != '/') {
+	scareMemory = 0;
+
+	/* Using realpath on the arg isn't correct if the arg is a symlink,
+	 * especially if the symlink is a dangling link.  What we should
+	 * instead do is use realpath() on `.' and then append arg to
+	 * it.
+	 */
+
+	/* if the current directory doesn't exist, we might fail. 
+	   oh well. likewise if it's too long.  */
+	if (realpath(".", dir) != NULL) {
+	    chptr1 = alloca(strlen(dir) + strlen(fullName) + 2);
+	    sprintf(chptr1, "%s/%s", dir, fullName);
+	    fullName = chptr1;
+	}
+    }
+
+    /* FIXME: perhaps we should collapse //, /./, and /../ stuff if
+       !scareMemory?? */
+
+    buf = alloca(strlen(fullName) + 1);
+    strcpy(buf, fullName);
+    end = strrchr(buf, '/');
+    while (*buf) {
+	*end = '\0';
+
+	/* as we're stating paths here, we want to follow symlinks */
+	if (!stat(buf, &sb)) {
+	    chptr1 = fullName + (end - buf) + 1;
+	    if (scareMemory)
+		fp.basename = strdup(chptr1);
+	    else
+		fp.basename = chptr1;
+	    fp.ino = sb.st_ino;
+	    fp.dev = sb.st_dev;
+	    return fp;
+	}
+
+	buf--;
+	while ((end > buf) && *end != '/') end--;
+    }
+
+    /* this can't happen, or stat('/') just failed! */
+    fp.basename = 0;
+    fp.ino = fp.dev = 0;
+
+    return fp;
+}
+

lib/fprint.h

@@ -0,0 +1,20 @@
+#ifndef H_FINGERPRINT
+#define H_FINGERPRINT
+
+typedef struct fingerprint_s {
+    dev_t dev;
+    ino_t ino;
+    char * basename;
+} fingerPrint;
+
+/* Be carefull with the memory... assert(*fullName == '/' || !scareMemory) */
+fingerPrint fpLookup(char * fullName, int scareMemory);
+
+/* only if !scarceMemory */
+#define fpFree(a) free((a).basename)
+
+#define FP_EQUAL(a, b) (((a).dev == (b).dev) && \
+			((a).ino == (b).ino) && \
+			!strcmp((a).basename, (b).basename))
+
+#endif