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-rw-r--r--path.c60
1 files changed, 60 insertions, 0 deletions
diff --git a/path.c b/path.c
new file mode 100644
index 0000000..d217ef0
--- /dev/null
+++ b/path.c
@@ -0,0 +1,60 @@
+/*
+ * I'm tired of doing "vsnprintf()" etc just to open a
+ * file, so here's a "return static buffer with printf"
+ * interface for paths.
+ *
+ * It's obviously not thread-safe. Sue me. But it's quite
+ * useful for doing things like
+ *
+ * f = open(mkpath("%s/%s.git", base, name), O_RDONLY);
+ *
+ * which is what it's designed for.
+ */
+#include "cache.h"
+
+static char pathname[PATH_MAX];
+static char bad_path[] = "/bad-path/";
+
+static char *cleanup_path(char *path)
+{
+ /* Clean it up */
+ if (!memcmp(path, "./", 2)) {
+ path += 2;
+ while (*path == '/')
+ path++;
+ }
+ return path;
+}
+
+char *mkpath(const char *fmt, ...)
+{
+ va_list args;
+ unsigned len;
+
+ va_start(args, fmt);
+ len = vsnprintf(pathname, PATH_MAX, fmt, args);
+ va_end(args);
+ if (len >= PATH_MAX)
+ return bad_path;
+ return cleanup_path(pathname);
+}
+
+char *git_path(const char *fmt, ...)
+{
+ const char *git_dir = gitenv(GIT_DIR_ENVIRONMENT) ? : DEFAULT_GIT_DIR_ENVIRONMENT;
+ va_list args;
+ unsigned len;
+
+ len = strlen(git_dir);
+ if (len > PATH_MAX-100)
+ return bad_path;
+ memcpy(pathname, git_dir, len);
+ if (len && git_dir[len-1] != '/')
+ pathname[len++] = '/';
+ va_start(args, fmt);
+ len += vsnprintf(pathname + len, PATH_MAX - len, fmt, args);
+ va_end(args);
+ if (len >= PATH_MAX)
+ return bad_path;
+ return cleanup_path(pathname);
+}