Add path_store function

2 files changed, 43 insertions, 0 deletions

diff --git a/include/utils.h b/include/utils.h
index 4816a31..f0400fb 100644
--- a/include/utils.h
+++ b/include/utils.h
@@ -33,6 +33,7 @@ char *find_program(const char *name);
 int touch(const char *filename);
 int git_clone(struct Process *proc, char *url, char *destdir, char *gitref);
 char *git_describe(const char *path);
+int path_store(char **destptr, size_t maxlen, const char *base, const char *path);
 
 #define OMC_MSG_SUCCESS 0
 #define OMC_MSG_NOP 1 << 0
diff --git a/src/utils.c b/src/utils.c
index 9e941f1..12cf22c 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -483,4 +483,46 @@ int isempty_dir(const char *path) {
     }
 
     return count == 0;
+}
+
+int path_store(char **destptr, size_t maxlen, const char *base, const char *path) {
+    char *path_tmp;
+    size_t base_len = 0;
+    size_t path_len = 0;
+
+    // Both path elements need to be defined to continue
+    if (!base || !path) {
+        return -1;
+    }
+
+    // Initialize destination pointer to length of maxlen
+    path_tmp = calloc(maxlen, sizeof(*path_tmp));
+    if (!path_tmp) {
+        return -1;
+    }
+
+    // Ensure generated path will fit in destination
+    base_len = strlen(base);
+    path_len = strlen(path);
+    // 2 = directory separator and NUL terminator
+    if (2 + (base_len + path_len) > maxlen) {
+        goto l_path_setup_error;
+    }
+
+    snprintf(path_tmp, maxlen - 1, "%s/%s", base, path);
+    if (mkdirs(path_tmp, 0755)) {
+        goto l_path_setup_error;
+    }
+
+    (*destptr) = realpath(path_tmp, NULL);
+    if (!*destptr) {
+        goto l_path_setup_error;
+    }
+
+    guard_free(path_tmp);
+    return 0;
+
+    l_path_setup_error:
+    guard_free(path_tmp);
+    return -1;
 }
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