nkiss

commit a5b7f756594e4d1e039a594f171d53a8eb851b87
parent 3b49ce26d9debcf435f7f1ed26ea6bdadbe24d5e
Author: Nihal Jere <nihal@nihaljere.xyz>
Date:   Wed, 17 Feb 2021 14:04:03 -0600

pkg.*: add pkg_exists to check whether a package exists in a repo

Diffstat:
M
pkg.c
 | 
28
++++++++++++++++++++++++++++
M
pkg.h
 | 
2
++

2 files changed, 30 insertions(+), 0 deletions(-)
diff --git a/pkg.c b/pkg.c
@@ -1,4 +1,5 @@
 #include <dirent.h>
+#include <errno.h>
 #include <fnmatch.h>
 #include <stdlib.h>
 #include <stdio.h>
@@ -64,3 +65,30 @@ pkg_match(char *repo, char pkgs[][PKG_NAME_MAX], const char *pattern)
 
     return index;
 }
+
+/* check if package name exists in repository
+ * path must be at least PATH_LEN length */
+int
+pkg_exists(const char *repo, const char *name, char *path)
+{
+    DIR *pkg;
+    int found = 0;
+
+    if (strlen(repo) + strlen(name) > PATH_LEN)
+        die("%s: repo path length + package name > max path length", __func__);
+
+    strcpy(path, repo);
+    strcat(path, "/");
+    strcat(path, name);
+
+    if ((pkg = opendir(path)) == NULL) {
+        if (errno == ENOENT) {
+            path[0] = '\0';
+            return 0;
+        } else
+            die("%s:", __func__);
+    }
+
+    closedir(pkg);
+    return 1;
+}
diff --git a/pkg.h b/pkg.h
@@ -2,6 +2,8 @@
 #define PKG_VERSION_MAX 256
 #define PKG_COUNT_MAX 1024
 #define PKG_NAME_MAX 64
+#define PATH_LEN 512
 
 void pkg_version(char *repo, char *name, char *ver);
 int pkg_match(char *repo, char pkgs[][64], const char *pattern);
+int pkg_exists(const char *repo, const char *name, char *path);