Introduce xbps_sanitize_path() to fix #78 properly.

This removes multiple slashes of a path and returns you a buffer with
the sanitized string.

include/xbps.h.in

@@ -48,7 +48,7 @@
  *
  * This header documents the full API for the XBPS Library.
  */
-#define XBPS_API_VERSION	"20150203"
+#define XBPS_API_VERSION	"20150218"
 
 #ifndef XBPS_VERSION
  #define XBPS_VERSION		"UNSET"
@@ -1933,6 +1933,15 @@ int xbps_cmpver(const char *pkg1, const char *pkg2);
  */
 char *xbps_pubkey2fp(struct xbps_handle *xhp, xbps_data_t pubkey);
 
+/**
+ * Returns a buffer with a sanitized path from \a src.
+ * This removes multiple slashes.
+ *
+ * @return The sanitized path in a buffer.
+ * The returned buffer must be free(3)d when it's no longer necessary.
+ */
+char *xbps_sanitize_path(const char *src);
+
 /*@}*/
 
 #ifdef __cplusplus

lib/package_remove.c

@@ -96,7 +96,7 @@ static char *
 symlink_target(struct xbps_handle *xhp, const char *path)
 {
 	struct stat sb;
-	char *lnk, *res = NULL;
+	char *p, *p1, *dname, *lnk, *res = NULL;
 	ssize_t r;
 
 	if (lstat(path, &sb) == -1)
@@ -112,8 +112,6 @@ symlink_target(struct xbps_handle *xhp, const char *path)
 	}
 	lnk[sb.st_size] = '\0';
 	if (strstr(lnk, "./") || lnk[0] != '/') {
-		char *p, *p1, *dname;
-
 		/* relative */
 		p = strdup(path);
 		assert(p);
@@ -121,16 +119,26 @@ symlink_target(struct xbps_handle *xhp, const char *path)
 		assert(dname);
 		p = xbps_xasprintf("%s/%s", dname, lnk);
 		assert(p);
-		if (strstr(p, "./") && ((p1 = realpath(p, NULL)))) {
-			res = strdup(p1 + strlen(xhp->rootdir));
-			free(p1);
+		p1 = xbps_sanitize_path(p);
+		assert(p1);
+		free(p);
+		if ((strstr(p1, "./")) && (p = realpath(p1, NULL))) {
+			if (strcmp(xhp->rootdir, "/") == 0)
+				res = strdup(p);
+			else
+				res = strdup(p + strlen(xhp->rootdir));
+
+			free(p);
 		}
 		if (res == NULL) {
-			res = strdup(p + strlen(xhp->rootdir)+1);
+			if (strcmp(xhp->rootdir, "/") == 0)
+				res = strdup(p1);
+			else
+				res = strdup(p1 + strlen(xhp->rootdir));
 		}
 		assert(res);
 		free(lnk);
-		free(p);
+		free(p1);
 	} else {
 		/* absolute */
 		res = lnk;

lib/util.c

@@ -1,5 +1,5 @@
 /*-
- * Copyright (c) 2008-2014 Juan Romero Pardines.
+ * Copyright (c) 2008-2015 Juan Romero Pardines.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -425,3 +425,30 @@ xbps_pkg_reverts(xbps_dictionary_t pkg, const char *pkgver)
 
 	return false;
 }
+
+char *
+xbps_sanitize_path(const char *src)
+{
+	const char *s = src;
+	char *d, *dest;
+	size_t len;
+
+	assert(src);
+	len = strlen(src);
+	assert(len != 0);
+
+	dest = malloc(len);
+	assert(dest);
+	d = dest;
+
+	while ((*d = *s)) {
+		if (*s == '/' && *(s+1) == '/') {
+			s++;
+			continue;
+		}
+		d++, s++;
+	}
+	*d = '\0';
+
+	return dest;
+}