nkiss

commit 5e7672736a68726a151262675c750b492e5d9fff
parent 35269b8b41fd16b9f2f6a96e153e0a37757d336e
Author: Nihal Jere <nihal@nihaljere.xyz>
Date:   Sun, 21 Feb 2021 17:50:30 -0600

alt.*: add alt_exists

Diffstat:
M
alt.c
 | 
13
+++++++++++++
M
alt.h
 | 
1
+

2 files changed, 14 insertions(+), 0 deletions(-)
diff --git a/alt.c b/alt.c
@@ -4,6 +4,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <unistd.h>
 
 #include "pkg.h"
 #include "alt.h"
@@ -43,6 +44,18 @@ to_choice(struct alt_t *alt, char *dest)
     strrepl(dest, '/', '>');
 }
 
+int
+alt_exists(struct alt_t *alt)
+{
+    char fname[PATH_LEN], path[PATH_LEN];
+    to_choice(alt, fname);
+
+    if (snprintf(path, PATH_LEN, "%s/%s", KISS_CHOICES, fname) > PATH_LEN)
+        die("%s: path %s too long", KISS_CHOICES, fname);
+
+    return access(path, F_OK);
+}
+
 static int
 alt_sort(const void *a, const void *b)
 {
diff --git a/alt.h b/alt.h
@@ -7,4 +7,5 @@ struct alt_t {
 };
 
 void alt_load();
+int alt_exists(struct alt_t *alt);
 void alt_owner(char owner[PKG_NAME_MAX], char *path);